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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
*/
/*
* structures that represent things to be painted (ordered in z-order),
* used during painting and hit testing
*/
#include "nsDisplayList.h"
#include <stdint.h>
#include <algorithm>
#include <limits>
#include "gfxContext.h"
#include "gfxUtils.h"
#include "mozilla/DisplayPortUtils.h"
#include "mozilla/Likely.h"
#include "mozilla/dom/BrowserChild.h"
#include "mozilla/dom/HTMLCanvasElement.h"
#include "mozilla/dom/RemoteBrowser.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/dom/ServiceWorkerRegistrar.h"
#include "mozilla/dom/ServiceWorkerRegistration.h"
#include "mozilla/dom/SVGElement.h"
#include "mozilla/dom/TouchEvent.h"
#include "mozilla/dom/PerformanceMainThread.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/PresShell.h"
#include "mozilla/ShapeUtils.h"
#include "mozilla/StaticPrefs_apz.h"
#include "mozilla/StaticPrefs_gfx.h"
#include "mozilla/StaticPrefs_layers.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/StaticPrefs_print.h"
#include "mozilla/SVGIntegrationUtils.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/ViewportUtils.h"
#include "nsCSSRendering.h"
#include "nsCSSRenderingGradients.h"
#include "nsCaseTreatment.h"
#include "nsRefreshDriver.h"
#include "nsRegion.h"
#include "nsStyleStructInlines.h"
#include "nsStyleTransformMatrix.h"
#include "nsTransitionManager.h"
#include "gfxMatrix.h"
#include "nsLayoutUtils.h"
#include "nsIScrollableFrame.h"
#include "nsIFrameInlines.h"
#include "nsStyleConsts.h"
#include "BorderConsts.h"
#include "mozilla/MathAlgorithms.h"
#include "imgIContainer.h"
#include "nsImageFrame.h"
#include "nsSubDocumentFrame.h"
#include "nsViewManager.h"
#include "ImageContainer.h"
#include "nsCanvasFrame.h"
#include "nsSubDocumentFrame.h"
#include "StickyScrollContainer.h"
#include "mozilla/AnimationPerformanceWarning.h"
#include "mozilla/AnimationUtils.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/EffectCompositor.h"
#include "mozilla/EffectSet.h"
#include "mozilla/glean/GleanMetrics.h"
#include "mozilla/HashTable.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/OperatorNewExtensions.h"
#include "mozilla/Preferences.h"
#include "mozilla/ProfilerLabels.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/StyleAnimationValue.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/SVGClipPathFrame.h"
#include "mozilla/SVGMaskFrame.h"
#include "mozilla/SVGObserverUtils.h"
#include "mozilla/Telemetry.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include "mozilla/ViewportFrame.h"
#include "mozilla/gfx/gfxVars.h"
#include "ActiveLayerTracker.h"
#include "nsEscape.h"
#include "nsPrintfCString.h"
#include "UnitTransforms.h"
#include "LayerAnimationInfo.h"
#include "mozilla/EventStateManager.h"
#include "nsCaret.h"
#include "nsDOMTokenList.h"
#include "nsCSSProps.h"
#include "nsTableCellFrame.h"
#include "nsTableColFrame.h"
#include "nsTextFrame.h"
#include "nsTextPaintStyle.h"
#include "nsSliderFrame.h"
#include "nsFocusManager.h"
#include "TextDrawTarget.h"
#include "mozilla/layers/AnimationHelper.h"
#include "mozilla/layers/CompositorThread.h"
#include "mozilla/layers/InputAPZContext.h"
#include "mozilla/layers/RenderRootStateManager.h"
#include "mozilla/layers/StackingContextHelper.h"
#include "mozilla/layers/TreeTraversal.h"
#include "mozilla/layers/WebRenderBridgeChild.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "mozilla/layers/WebRenderMessages.h"
#include "mozilla/layers/WebRenderScrollData.h"
namespace mozilla {
using namespace dom;
using namespace gfx;
using namespace layout;
using namespace layers;
using namespace image;
LazyLogModule sContentDisplayListLog("dl.content");
LazyLogModule sParentDisplayListLog("dl.parent");
LazyLogModule& GetLoggerByProcess() {
return XRE_IsContentProcess() ? sContentDisplayListLog
: sParentDisplayListLog;
}
#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
void AssertUniqueItem(nsDisplayItem* aItem) {
for (nsDisplayItem* i : aItem->Frame()->DisplayItems()) {
if (i != aItem && !i->HasDeletedFrame() && i->Frame() == aItem->Frame() &&
i->GetPerFrameKey() == aItem->GetPerFrameKey()) {
if (i->IsPreProcessedItem() || i->IsPreProcessed()) {
continue;
}
MOZ_DIAGNOSTIC_ASSERT(false, "Duplicate display item!");
}
}
}
#endif
bool ShouldBuildItemForEvents(const DisplayItemType aType) {
return aType == DisplayItemType::TYPE_COMPOSITOR_HITTEST_INFO ||
(GetDisplayItemFlagsForType(aType) & TYPE_IS_CONTAINER);
}
static bool ItemTypeSupportsHitTesting(const DisplayItemType aType) {
switch (aType) {
case DisplayItemType::TYPE_BACKGROUND:
case DisplayItemType::TYPE_BACKGROUND_COLOR:
case DisplayItemType::TYPE_THEMED_BACKGROUND:
return true;
default:
return false;
}
}
void InitializeHitTestInfo(nsDisplayListBuilder* aBuilder,
nsPaintedDisplayItem* aItem,
const DisplayItemType aType) {
if (ItemTypeSupportsHitTesting(aType)) {
aItem->InitializeHitTestInfo(aBuilder);
}
}
/* static */
already_AddRefed<ActiveScrolledRoot> ActiveScrolledRoot::CreateASRForFrame(
const ActiveScrolledRoot* aParent, nsIScrollableFrame* aScrollableFrame,
bool aIsRetained) {
nsIFrame* f = do_QueryFrame(aScrollableFrame);
RefPtr<ActiveScrolledRoot> asr;
if (aIsRetained) {
asr = f->GetProperty(ActiveScrolledRootCache());
}
if (!asr) {
asr = new ActiveScrolledRoot();
if (aIsRetained) {
RefPtr<ActiveScrolledRoot> ref = asr;
f->SetProperty(ActiveScrolledRootCache(), ref.forget().take());
}
}
asr->mParent = aParent;
asr->mScrollableFrame = aScrollableFrame;
asr->mDepth = aParent ? aParent->mDepth + 1 : 1;
asr->mRetained = aIsRetained;
return asr.forget();
}
/* static */
bool ActiveScrolledRoot::IsAncestor(const ActiveScrolledRoot* aAncestor,
const ActiveScrolledRoot* aDescendant) {
if (!aAncestor) {
// nullptr is the root
return true;
}
if (Depth(aAncestor) > Depth(aDescendant)) {
return false;
}
const ActiveScrolledRoot* asr = aDescendant;
while (asr) {
if (asr == aAncestor) {
return true;
}
asr = asr->mParent;
}
return false;
}
/* static */
bool ActiveScrolledRoot::IsProperAncestor(
const ActiveScrolledRoot* aAncestor,
const ActiveScrolledRoot* aDescendant) {
return aAncestor != aDescendant && IsAncestor(aAncestor, aDescendant);
}
/* static */
nsCString ActiveScrolledRoot::ToString(
const ActiveScrolledRoot* aActiveScrolledRoot) {
nsAutoCString str;
for (const auto* asr = aActiveScrolledRoot; asr; asr = asr->mParent) {
str.AppendPrintf("<0x%p>", asr->mScrollableFrame);
if (asr->mParent) {
str.AppendLiteral(", ");
}
}
return std::move(str);
}
ScrollableLayerGuid::ViewID ActiveScrolledRoot::ComputeViewId() const {
nsIContent* content = mScrollableFrame->GetScrolledFrame()->GetContent();
return nsLayoutUtils::FindOrCreateIDFor(content);
}
ActiveScrolledRoot::~ActiveScrolledRoot() {
if (mScrollableFrame && mRetained) {
nsIFrame* f = do_QueryFrame(mScrollableFrame);
f->RemoveProperty(ActiveScrolledRootCache());
}
}
static uint64_t AddAnimationsForWebRender(
nsDisplayItem* aItem, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder,
const Maybe<LayoutDevicePoint>& aPosition = Nothing()) {
auto* effects = EffectSet::GetForFrame(aItem->Frame(), aItem->GetType());
if (!effects || effects->IsEmpty()) {
// If there is no animation on the nsIFrame, that means
// 1) we've never created any animations on this frame or
// 2) the frame was reconstruced or
// 3) all animations on the frame have finished
// in such cases we don't need do anything here.
//
// Even if there is a WebRenderAnimationData for the display item type on
// this frame, it's going to be discarded since it's not marked as being
// used.
return 0;
}
RefPtr<WebRenderAnimationData> animationData =
aManager->CommandBuilder()
.CreateOrRecycleWebRenderUserData<WebRenderAnimationData>(aItem);
AnimationInfo& animationInfo = animationData->GetAnimationInfo();
nsIFrame* frame = aItem->Frame();
animationInfo.AddAnimationsForDisplayItem(
frame, aDisplayListBuilder, aItem, aItem->GetType(),
aManager->LayerManager(), aPosition);
// Note that animationsId can be 0 (uninitialized in AnimationInfo) if there
// are no active animations.
uint64_t animationsId = animationInfo.GetCompositorAnimationsId();
if (!animationInfo.GetAnimations().IsEmpty()) {
OpAddCompositorAnimations anim(
CompositorAnimations(animationInfo.GetAnimations(), animationsId));
aManager->WrBridge()->AddWebRenderParentCommand(anim);
aManager->AddActiveCompositorAnimationId(animationsId);
} else if (animationsId) {
aManager->AddCompositorAnimationsIdForDiscard(animationsId);
animationsId = 0;
}
return animationsId;
}
static bool GenerateAndPushTextMask(nsIFrame* aFrame, gfxContext* aContext,
const nsRect& aFillRect,
nsDisplayListBuilder* aBuilder) {
if (aBuilder->IsForGenerateGlyphMask()) {
return false;
}
SVGObserverUtils::GetAndObserveBackgroundClip(aFrame);
// The main function of enabling background-clip:text property value.
// When a nsDisplayBackgroundImage detects "text" bg-clip style, it will call
// this function to
// 1. Generate a mask by all descendant text frames
// 2. Push the generated mask into aContext.
gfxContext* sourceCtx = aContext;
LayoutDeviceRect bounds = LayoutDeviceRect::FromAppUnits(
aFillRect, aFrame->PresContext()->AppUnitsPerDevPixel());
// Create a mask surface.
RefPtr<DrawTarget> sourceTarget = sourceCtx->GetDrawTarget();
RefPtr<DrawTarget> maskDT = sourceTarget->CreateClippedDrawTarget(
bounds.ToUnknownRect(), SurfaceFormat::A8);
if (!maskDT || !maskDT->IsValid()) {
return false;
}
gfxContext maskCtx(maskDT, /* aPreserveTransform */ true);
maskCtx.Multiply(Matrix::Translation(bounds.TopLeft().ToUnknownPoint()));
// Shade text shape into mask A8 surface.
nsLayoutUtils::PaintFrame(
&maskCtx, aFrame, nsRect(nsPoint(0, 0), aFrame->GetSize()),
NS_RGB(255, 255, 255), nsDisplayListBuilderMode::GenerateGlyph);
// Push the generated mask into aContext, so that the caller can pop and
// blend with it.
Matrix currentMatrix = sourceCtx->CurrentMatrix();
Matrix invCurrentMatrix = currentMatrix;
invCurrentMatrix.Invert();
RefPtr<SourceSurface> maskSurface = maskDT->Snapshot();
sourceCtx->PushGroupForBlendBack(gfxContentType::COLOR_ALPHA, 1.0,
maskSurface, invCurrentMatrix);
return true;
}
nsDisplayWrapper* nsDisplayWrapList::CreateShallowCopy(
nsDisplayListBuilder* aBuilder) {
const nsDisplayWrapList* wrappedItem = AsDisplayWrapList();
MOZ_ASSERT(wrappedItem);
// Create a new nsDisplayWrapList using a copy-constructor. This is done
// to preserve the information about bounds.
nsDisplayWrapper* wrapper =
new (aBuilder) nsDisplayWrapper(aBuilder, *wrappedItem);
wrapper->SetType(nsDisplayWrapper::ItemType());
MOZ_ASSERT(wrapper);
// Set the display list pointer of the new wrapper item to the display list
// of the wrapped item.
wrapper->mListPtr = wrappedItem->mListPtr;
return wrapper;
}
nsDisplayWrapList* nsDisplayListBuilder::MergeItems(
nsTArray<nsDisplayItem*>& aItems) {
// For merging, we create a temporary item by cloning the last item of the
// mergeable items list. This ensures that the temporary item will have the
// correct frame and bounds.
nsDisplayWrapList* last = aItems.PopLastElement()->AsDisplayWrapList();
MOZ_ASSERT(last);
nsDisplayWrapList* merged = last->Clone(this);
MOZ_ASSERT(merged);
AddTemporaryItem(merged);
// Create nsDisplayWrappers that point to the internal display lists of the
// items we are merging. These nsDisplayWrappers are added to the display list
// of the temporary item.
for (nsDisplayItem* item : aItems) {
MOZ_ASSERT(item);
MOZ_ASSERT(merged->CanMerge(item));
merged->Merge(item);
MOZ_ASSERT(item->AsDisplayWrapList());
merged->GetChildren()->AppendToTop(
static_cast<nsDisplayWrapList*>(item)->CreateShallowCopy(this));
}
merged->GetChildren()->AppendToTop(last->CreateShallowCopy(this));
return merged;
}
// FIXME(emilio): This whole business should ideally not be needed at all, but
// there are a variety of hard-to-deal-with caret invalidation issues, like
// probably isn't worth chasing all them down.
void nsDisplayListBuilder::InvalidateCaretFramesIfNeeded() {
if (mPaintedCarets.IsEmpty()) {
return;
}
size_t i = mPaintedCarets.Length();
while (i--) {
nsCaret* caret = mPaintedCarets[i];
nsIFrame* oldCaret = caret->GetLastPaintedFrame();
nsRect caretRect;
nsIFrame* currentCaret = caret->GetPaintGeometry(&caretRect);
if (oldCaret == currentCaret) {
// Keep tracking this caret, it hasn't changed.
continue;
}
if (oldCaret) {
oldCaret->MarkNeedsDisplayItemRebuild();
}
if (currentCaret) {
currentCaret->MarkNeedsDisplayItemRebuild();
}
// If / when we paint this caret, we'll track it again.
caret->SetLastPaintedFrame(nullptr);
mPaintedCarets.RemoveElementAt(i);
}
}
void nsDisplayListBuilder::AutoCurrentActiveScrolledRootSetter::
SetCurrentActiveScrolledRoot(
const ActiveScrolledRoot* aActiveScrolledRoot) {
MOZ_ASSERT(!mUsed);
// Set the builder's mCurrentActiveScrolledRoot.
mBuilder->mCurrentActiveScrolledRoot = aActiveScrolledRoot;
// We also need to adjust the builder's mCurrentContainerASR.
// mCurrentContainerASR needs to be an ASR that all the container's
// contents have finite bounds with respect to. If aActiveScrolledRoot
// is an ancestor ASR of mCurrentContainerASR, that means we need to
// set mCurrentContainerASR to aActiveScrolledRoot, because otherwise
// the items that will be created with aActiveScrolledRoot wouldn't
// have finite bounds with respect to mCurrentContainerASR. There's one
// exception, in the case where there's a content clip on the builder
// that is scrolled by a descendant ASR of aActiveScrolledRoot. This
// content clip will clip all items that are created while this
// AutoCurrentActiveScrolledRootSetter exists. This means that the items
// created during our lifetime will have finite bounds with respect to
// the content clip's ASR, even if the items' actual ASR is an ancestor
// of that. And it also means that mCurrentContainerASR only needs to be
// set to the content clip's ASR and not all the way to aActiveScrolledRoot.
// This case is tested by fixed-pos-scrolled-clip-opacity-layerize.html
// and fixed-pos-scrolled-clip-opacity-inside-layerize.html.
// finiteBoundsASR is the leafmost ASR that all items created during
// object's lifetime have finite bounds with respect to.
const ActiveScrolledRoot* finiteBoundsASR =
ActiveScrolledRoot::PickDescendant(mContentClipASR, aActiveScrolledRoot);
// mCurrentContainerASR is adjusted so that it's still an ancestor of
// finiteBoundsASR.
mBuilder->mCurrentContainerASR = ActiveScrolledRoot::PickAncestor(
mBuilder->mCurrentContainerASR, finiteBoundsASR);
// If we are entering out-of-flow content inside a CSS filter, mark
// scroll frames wrt. which the content is fixed as containing such content.
if (mBuilder->mFilterASR && ActiveScrolledRoot::IsAncestor(
aActiveScrolledRoot, mBuilder->mFilterASR)) {
for (const ActiveScrolledRoot* asr = mBuilder->mFilterASR;
asr && asr != aActiveScrolledRoot; asr = asr->mParent) {
asr->mScrollableFrame->SetHasOutOfFlowContentInsideFilter();
}
}
mUsed = true;
}
void nsDisplayListBuilder::AutoCurrentActiveScrolledRootSetter::
InsertScrollFrame(nsIScrollableFrame* aScrollableFrame) {
MOZ_ASSERT(!mUsed);
size_t descendantsEndIndex = mBuilder->mActiveScrolledRoots.Length();
const ActiveScrolledRoot* parentASR = mBuilder->mCurrentActiveScrolledRoot;
const ActiveScrolledRoot* asr =
mBuilder->AllocateActiveScrolledRoot(parentASR, aScrollableFrame);
mBuilder->mCurrentActiveScrolledRoot = asr;
// All child ASRs of parentASR that were created while this
// AutoCurrentActiveScrolledRootSetter object was on the stack belong to us
// now. Reparent them to asr.
for (size_t i = mDescendantsStartIndex; i < descendantsEndIndex; i++) {
ActiveScrolledRoot* descendantASR = mBuilder->mActiveScrolledRoots[i];
if (ActiveScrolledRoot::IsAncestor(parentASR, descendantASR)) {
descendantASR->IncrementDepth();
if (descendantASR->mParent == parentASR) {
descendantASR->mParent = asr;
}
}
}
mUsed = true;
}
nsDisplayListBuilder::AutoContainerASRTracker::AutoContainerASRTracker(
nsDisplayListBuilder* aBuilder)
: mBuilder(aBuilder), mSavedContainerASR(aBuilder->mCurrentContainerASR) {
mBuilder->mCurrentContainerASR = mBuilder->mCurrentActiveScrolledRoot;
}
nsPresContext* nsDisplayListBuilder::CurrentPresContext() {
return CurrentPresShellState()->mPresShell->GetPresContext();
}
/* static */
nsRect nsDisplayListBuilder::OutOfFlowDisplayData::ComputeVisibleRectForFrame(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
const nsRect& aVisibleRect, const nsRect& aDirtyRect,
nsRect* aOutDirtyRect) {
nsRect visible = aVisibleRect;
nsRect dirtyRectRelativeToDirtyFrame = aDirtyRect;
bool inPartialUpdate =
aBuilder->IsRetainingDisplayList() && aBuilder->IsPartialUpdate();
if (StaticPrefs::apz_allow_zooming() &&
DisplayPortUtils::IsFixedPosFrameInDisplayPort(aFrame) &&
aBuilder->IsPaintingToWindow() && !inPartialUpdate) {
dirtyRectRelativeToDirtyFrame =
nsRect(nsPoint(0, 0), aFrame->GetParent()->GetSize());
// If there's a visual viewport size set, restrict the amount of the
// fixed-position element we paint to the visual viewport. (In general
// the fixed-position element can be as large as the layout viewport,
// which at a high zoom level can cause us to paint too large of an
// area.)
PresShell* presShell = aFrame->PresShell();
if (presShell->IsVisualViewportSizeSet()) {
dirtyRectRelativeToDirtyFrame =
nsRect(presShell->GetVisualViewportOffsetRelativeToLayoutViewport(),
presShell->GetVisualViewportSize());
// But if we have a displayport, expand it to the displayport, so
// that async-scrolling the visual viewport within the layout viewport
// will not checkerboard.
if (nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame()) {
nsRect displayport;
// Note that the displayport here is already in the right coordinate
// space: it's relative to the scroll port (= layout viewport), but
// covers the visual viewport with some margins around it, which is
// exactly what we want.
if (DisplayPortUtils::GetDisplayPort(
rootScrollFrame->GetContent(), &displayport,
DisplayPortOptions().With(ContentGeometryType::Fixed))) {
dirtyRectRelativeToDirtyFrame = displayport;
}
}
}
visible = dirtyRectRelativeToDirtyFrame;
if (StaticPrefs::apz_test_logging_enabled() &&
presShell->GetDocument()->IsContentDocument()) {
nsLayoutUtils::LogAdditionalTestData(
aBuilder, "fixedPosDisplayport",
ToString(CSSSize::FromAppUnits(visible)));
}
}
*aOutDirtyRect = dirtyRectRelativeToDirtyFrame - aFrame->GetPosition();
visible -= aFrame->GetPosition();
nsRect overflowRect = aFrame->InkOverflowRect();
if (aFrame->IsTransformed() && EffectCompositor::HasAnimationsForCompositor(
aFrame, DisplayItemType::TYPE_TRANSFORM)) {
/**
* Add a fuzz factor to the overflow rectangle so that elements only
* just out of view are pulled into the display list, so they can be
* prerendered if necessary.
*/
overflowRect.Inflate(nsPresContext::CSSPixelsToAppUnits(32));
}
visible.IntersectRect(visible, overflowRect);
aOutDirtyRect->IntersectRect(*aOutDirtyRect, overflowRect);
return visible;
}
nsDisplayListBuilder::Linkifier::Linkifier(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList)
: mList(aList) {
// Find the element that we need to check for link-ness, bailing out if
// we can't find one.
Element* elem = Element::FromNodeOrNull(aFrame->GetContent());
if (!elem) {
return;
}
// If the element has an id and/or name attribute, generate a destination
// for possible internal linking.
auto maybeGenerateDest = [&](const nsAtom* aAttr) {
nsAutoString attrValue;
elem->GetAttr(aAttr, attrValue);
if (!attrValue.IsEmpty()) {
NS_ConvertUTF16toUTF8 dest(attrValue);
// Ensure that we only emit a given destination once, although there may
// be multiple frames associated with a given element; we'll simply use
// the first of them as the target of any links to it.
// XXX(jfkthame) This prevents emitting duplicate destinations *on the
// same page*, but does not prevent duplicates on subsequent pages, as
// each new page is handled by a new temporary DisplayListBuilder. This
// seems to be harmless in practice, though a bit wasteful of space. To
// fix, we need to maintain the set of already-seen destinations globally
// for the print job, rather than attached to the (per-page) builder.
if (aBuilder->mDestinations.EnsureInserted(dest)) {
auto* destination = MakeDisplayItem<nsDisplayDestination>(
aBuilder, aFrame, dest.get(), aFrame->GetRect().TopLeft());
mList->AppendToTop(destination);
}
}
};
if (StaticPrefs::print_save_as_pdf_internal_destinations_enabled()) {
if (elem->HasID()) {
maybeGenerateDest(nsGkAtoms::id);
}
if (elem->HasName()) {
maybeGenerateDest(nsGkAtoms::name);
}
}
// Links don't nest, so if the builder already has a destination, no need to
// check for a link element here.
if (!aBuilder->mLinkSpec.IsEmpty()) {
return;
}
// Check if we have actually found a link.
if (!elem->IsLink()) {
return;
}
nsCOMPtr<nsIURI> uri = elem->GetHrefURI();
if (!uri) {
return;
}
// Is it a local (in-page) destination?
bool hasRef, eqExRef;
nsIURI* docURI;
if (StaticPrefs::print_save_as_pdf_internal_destinations_enabled() &&
NS_SUCCEEDED(uri->GetHasRef(&hasRef)) && hasRef &&
(docURI = aFrame->PresContext()->Document()->GetDocumentURI()) &&
NS_SUCCEEDED(uri->EqualsExceptRef(docURI, &eqExRef)) && eqExRef) {
if (NS_FAILED(uri->GetRef(aBuilder->mLinkSpec)) ||
aBuilder->mLinkSpec.IsEmpty()) {
return;
}
// The destination name is simply a string; we don't want URL-escaping
// applied to it.
NS_UnescapeURL(aBuilder->mLinkSpec);
// Mark the link spec as being an internal destination
aBuilder->mLinkSpec.Insert('#', 0);
} else {
if (NS_FAILED(uri->GetSpec(aBuilder->mLinkSpec)) ||
aBuilder->mLinkSpec.IsEmpty()) {
return;
}
}
// Record that we need to reset the builder's state on destruction.
mBuilderToReset = aBuilder;
}
void nsDisplayListBuilder::Linkifier::MaybeAppendLink(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame) {
// Note that we may generate a link here even if the constructor bailed out
// without updating aBuilder->LinkSpec(), because it may have been set by
// an ancestor that was associated with a link element.
if (!aBuilder->mLinkSpec.IsEmpty()) {
auto* link = MakeDisplayItem<nsDisplayLink>(
aBuilder, aFrame, aBuilder->mLinkSpec.get(), aFrame->GetRect());
mList->AppendToTop(link);
}
}
uint32_t nsDisplayListBuilder::sPaintSequenceNumber(1);
nsDisplayListBuilder::nsDisplayListBuilder(nsIFrame* aReferenceFrame,
nsDisplayListBuilderMode aMode,
bool aBuildCaret,
bool aRetainingDisplayList)
: mReferenceFrame(aReferenceFrame),
mIgnoreScrollFrame(nullptr),
mCurrentActiveScrolledRoot(nullptr),
mCurrentContainerASR(nullptr),
mCurrentFrame(aReferenceFrame),
mCurrentReferenceFrame(aReferenceFrame),
mScrollInfoItemsForHoisting(nullptr),
mFirstClipChainToDestroy(nullptr),
mTableBackgroundSet(nullptr),
mCurrentScrollParentId(ScrollableLayerGuid::NULL_SCROLL_ID),
mCurrentScrollbarTarget(ScrollableLayerGuid::NULL_SCROLL_ID),
mFilterASR(nullptr),
mDirtyRect(-1, -1, -1, -1),
mBuildingExtraPagesForPageNum(0),
mMode(aMode),
mContainsBlendMode(false),
mIsBuildingScrollbar(false),
mCurrentScrollbarWillHaveLayer(false),
mBuildCaret(aBuildCaret),
mRetainingDisplayList(aRetainingDisplayList),
mPartialUpdate(false),
mIgnoreSuppression(false),
mIncludeAllOutOfFlows(false),
mDescendIntoSubdocuments(true),
mSelectedFramesOnly(false),
mAllowMergingAndFlattening(true),
mInTransform(false),
mInEventsOnly(false),
mInFilter(false),
mInPageSequence(false),
mIsInChromePresContext(false),
mSyncDecodeImages(false),
mIsPaintingToWindow(false),
mUseHighQualityScaling(false),
mIsPaintingForWebRender(false),
mIsCompositingCheap(false),
mAncestorHasApzAwareEventHandler(false),
mHaveScrollableDisplayPort(false),
mWindowDraggingAllowed(false),
mIsBuildingForPopup(nsLayoutUtils::IsPopup(aReferenceFrame)),
mForceLayerForScrollParent(false),
mContainsNonMinimalDisplayPort(false),
mAsyncPanZoomEnabled(nsLayoutUtils::AsyncPanZoomEnabled(aReferenceFrame)),
mBuildingInvisibleItems(false),
mIsBuilding(false),
mInInvalidSubtree(false),
mDisablePartialUpdates(false),
mPartialBuildFailed(false),
mIsInActiveDocShell(false),
mBuildAsyncZoomContainer(false),
mIsRelativeToLayoutViewport(false),
mUseOverlayScrollbars(false),
mAlwaysLayerizeScrollbars(false) {
MOZ_COUNT_CTOR(nsDisplayListBuilder);
mBuildCompositorHitTestInfo = mAsyncPanZoomEnabled && IsForPainting();
ShouldRebuildDisplayListDueToPrefChange();
mUseOverlayScrollbars =
!!LookAndFeel::GetInt(LookAndFeel::IntID::UseOverlayScrollbars);
mAlwaysLayerizeScrollbars =
StaticPrefs::layout_scrollbars_always_layerize_track();
static_assert(
static_cast<uint32_t>(DisplayItemType::TYPE_MAX) < (1 << TYPE_BITS),
"Check TYPE_MAX should not overflow");
mIsReusingStackingContextItems =
mRetainingDisplayList && StaticPrefs::layout_display_list_retain_sc();
}
void nsDisplayListBuilder::BeginFrame() {
nsCSSRendering::BeginFrameTreesLocked();
mIsPaintingToWindow = false;
mUseHighQualityScaling = false;
mIgnoreSuppression = false;
mInTransform = false;
mInFilter = false;
mSyncDecodeImages = false;
}
void nsDisplayListBuilder::AddEffectUpdate(dom::RemoteBrowser* aBrowser,
const dom::EffectsInfo& aUpdate) {
dom::EffectsInfo update = aUpdate;
// For printing we create one display item for each page that an iframe
// appears on, the proper visible rect is the union of all the visible rects
// we get from each display item.
nsPresContext* pc =
mReferenceFrame ? mReferenceFrame->PresContext() : nullptr;
if (pc && pc->Type() != nsPresContext::eContext_Galley) {
Maybe<dom::EffectsInfo> existing = mEffectsUpdates.MaybeGet(aBrowser);
if (existing) {
// Only the visible rect should differ, the scales should match.
MOZ_ASSERT(existing->mRasterScale == aUpdate.mRasterScale &&
existing->mTransformToAncestorScale ==
aUpdate.mTransformToAncestorScale);
if (existing->mVisibleRect) {
if (update.mVisibleRect) {
update.mVisibleRect =
Some(update.mVisibleRect->Union(*existing->mVisibleRect));
} else {
update.mVisibleRect = existing->mVisibleRect;
}
}
}
}
mEffectsUpdates.InsertOrUpdate(aBrowser, update);
}
void nsDisplayListBuilder::EndFrame() {
NS_ASSERTION(!mInInvalidSubtree,
"Someone forgot to cleanup mInInvalidSubtree!");
mCurrentContainerASR = nullptr;
mActiveScrolledRoots.Clear();
mEffectsUpdates.Clear();
FreeClipChains();
FreeTemporaryItems();
nsCSSRendering::EndFrameTreesLocked();
}
void nsDisplayListBuilder::MarkFrameForDisplay(nsIFrame* aFrame,
const nsIFrame* aStopAtFrame) {
mFramesMarkedForDisplay.AppendElement(aFrame);
for (nsIFrame* f = aFrame; f;
f = nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(f)) {
if (f->HasAnyStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO)) {
return;
}
f->AddStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO);
if (f == aStopAtFrame) {
// we've reached a frame that we know will be painted, so we can stop.
break;
}
}
}
void nsDisplayListBuilder::AddFrameMarkedForDisplayIfVisible(nsIFrame* aFrame) {
mFramesMarkedForDisplayIfVisible.AppendElement(aFrame);
}
static void MarkFrameForDisplayIfVisibleInternal(nsIFrame* aFrame,
const nsIFrame* aStopAtFrame) {
for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetDisplayListParent(f)) {
if (f->ForceDescendIntoIfVisible()) {
return;
}
f->SetForceDescendIntoIfVisible(true);
// This condition must match the condition in
// nsLayoutUtils::GetParentOrPlaceholderFor which is used by
// nsLayoutUtils::GetDisplayListParent
if (f->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) && !f->GetPrevInFlow()) {
nsIFrame* parent = f->GetParent();
if (parent && !parent->ForceDescendIntoIfVisible()) {
// If the GetDisplayListParent call is going to walk to a placeholder,
// in rare cases the placeholder might be contained in a different
// continuation from the oof. So we have to make sure to mark the oofs
// parent. In the common case this doesn't make us do any extra work,
// just changes the order in which we visit the frames since walking
// through placeholders will walk through the parent, and we stop when
// we find a ForceDescendIntoIfVisible bit set.
MarkFrameForDisplayIfVisibleInternal(parent, aStopAtFrame);
}
}
if (f == aStopAtFrame) {
// we've reached a frame that we know will be painted, so we can stop.
break;
}
}
}
void nsDisplayListBuilder::MarkFrameForDisplayIfVisible(
nsIFrame* aFrame, const nsIFrame* aStopAtFrame) {
AddFrameMarkedForDisplayIfVisible(aFrame);
MarkFrameForDisplayIfVisibleInternal(aFrame, aStopAtFrame);
}
void nsDisplayListBuilder::SetIsRelativeToLayoutViewport() {
mIsRelativeToLayoutViewport = true;
UpdateShouldBuildAsyncZoomContainer();
}
void nsDisplayListBuilder::ForceLayerForScrollParent() {
mForceLayerForScrollParent = true;
mNumActiveScrollframesEncountered++;
}
void nsDisplayListBuilder::UpdateShouldBuildAsyncZoomContainer() {
const Document* document = mReferenceFrame->PresContext()->Document();
mBuildAsyncZoomContainer = !mIsRelativeToLayoutViewport &&
!document->Fullscreen() &&
nsLayoutUtils::AllowZoomingForDocument(document);
}
// Certain prefs may cause display list items to be added or removed when they
// are toggled. In those cases, we need to fully rebuild the display list.
bool nsDisplayListBuilder::ShouldRebuildDisplayListDueToPrefChange() {
// If we transition between wrapping the RCD-RSF contents into an async
// zoom container vs. not, we need to rebuild the display list. This only
// happens when the zooming or container scrolling prefs are toggled
// (manually by the user, or during test setup).
bool didBuildAsyncZoomContainer = mBuildAsyncZoomContainer;
UpdateShouldBuildAsyncZoomContainer();
bool hadOverlayScrollbarsLastTime = mUseOverlayScrollbars;
mUseOverlayScrollbars =
!!LookAndFeel::GetInt(LookAndFeel::IntID::UseOverlayScrollbars);
bool alwaysLayerizedScrollbarsLastTime = mAlwaysLayerizeScrollbars;
mAlwaysLayerizeScrollbars =
StaticPrefs::layout_scrollbars_always_layerize_track();
if (didBuildAsyncZoomContainer != mBuildAsyncZoomContainer) {
return true;
}
if (hadOverlayScrollbarsLastTime != mUseOverlayScrollbars) {
return true;
}
if (alwaysLayerizedScrollbarsLastTime != mAlwaysLayerizeScrollbars) {
return true;
}
return false;
}
void nsDisplayListBuilder::AddScrollFrameToNotify(
nsIScrollableFrame* aScrollFrame) {
mScrollFramesToNotify.insert(aScrollFrame);
}
void nsDisplayListBuilder::NotifyAndClearScrollFrames() {
for (const auto& it : mScrollFramesToNotify) {
it->NotifyApzTransaction();
}
mScrollFramesToNotify.clear();
}
bool nsDisplayListBuilder::MarkOutOfFlowFrameForDisplay(
nsIFrame* aDirtyFrame, nsIFrame* aFrame, const nsRect& aVisibleRect,
const nsRect& aDirtyRect) {
MOZ_ASSERT(aFrame->GetParent() == aDirtyFrame);
nsRect dirty;
nsRect visible = OutOfFlowDisplayData::ComputeVisibleRectForFrame(
this, aFrame, aVisibleRect, aDirtyRect, &dirty);
if (!aFrame->HasAnyStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO) &&
visible.IsEmpty()) {
return false;
}
// Only MarkFrameForDisplay if we're dirty. If this is a nested out-of-flow
// frame, then it will also mark any outer frames to ensure that building
// reaches the dirty feame.
if (!dirty.IsEmpty() || aFrame->ForceDescendIntoIfVisible()) {
MarkFrameForDisplay(aFrame, aDirtyFrame);
}
return true;
}
static void UnmarkFrameForDisplay(nsIFrame* aFrame,
const nsIFrame* aStopAtFrame) {
for (nsIFrame* f = aFrame; f;
f = nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(f)) {
if (!f->HasAnyStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO)) {
return;
}
f->RemoveStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO);
if (f == aStopAtFrame) {
// we've reached a frame that we know will be painted, so we can stop.
break;
}
}
}
static void UnmarkFrameForDisplayIfVisible(nsIFrame* aFrame) {
for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetDisplayListParent(f)) {
if (!f->ForceDescendIntoIfVisible()) {
return;
}
f->SetForceDescendIntoIfVisible(false);
// This condition must match the condition in
// nsLayoutUtils::GetParentOrPlaceholderFor which is used by
// nsLayoutUtils::GetDisplayListParent
if (f->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) && !f->GetPrevInFlow()) {
nsIFrame* parent = f->GetParent();
if (parent && parent->ForceDescendIntoIfVisible()) {
// If the GetDisplayListParent call is going to walk to a placeholder,
// in rare cases the placeholder might be contained in a different
// continuation from the oof. So we have to make sure to mark the oofs
// parent. In the common case this doesn't make us do any extra work,
// just changes the order in which we visit the frames since walking
// through placeholders will walk through the parent, and we stop when
// we find a ForceDescendIntoIfVisible bit set.
UnmarkFrameForDisplayIfVisible(f);
}
}
}
}
nsDisplayListBuilder::~nsDisplayListBuilder() {
NS_ASSERTION(mFramesMarkedForDisplay.Length() == 0,
"All frames should have been unmarked");
NS_ASSERTION(mFramesWithOOFData.Length() == 0,
"All OOF data should have been removed");
NS_ASSERTION(mPresShellStates.Length() == 0,
"All presshells should have been exited");
DisplayItemClipChain* c = mFirstClipChainToDestroy;
while (c) {
DisplayItemClipChain* next = c->mNextClipChainToDestroy;
c->DisplayItemClipChain::~DisplayItemClipChain();
c = next;
}
MOZ_COUNT_DTOR(nsDisplayListBuilder);
}
uint32_t nsDisplayListBuilder::GetBackgroundPaintFlags() {
uint32_t flags = 0;
if (mSyncDecodeImages) {
flags |= nsCSSRendering::PAINTBG_SYNC_DECODE_IMAGES;
}
if (mIsPaintingToWindow) {
flags |= nsCSSRendering::PAINTBG_TO_WINDOW;
}
if (mUseHighQualityScaling) {
flags |= nsCSSRendering::PAINTBG_HIGH_QUALITY_SCALING;
}
return flags;
}
// TODO(emilio): Maybe unify BackgroundPaintFlags and IamgeRendererFlags.
uint32_t nsDisplayListBuilder::GetImageRendererFlags() const {
uint32_t flags = 0;
if (mSyncDecodeImages) {
flags |= nsImageRenderer::FLAG_SYNC_DECODE_IMAGES;
}
if (mIsPaintingToWindow) {
flags |= nsImageRenderer::FLAG_PAINTING_TO_WINDOW;
}
if (mUseHighQualityScaling) {
flags |= nsImageRenderer::FLAG_HIGH_QUALITY_SCALING;
}
return flags;
}
uint32_t nsDisplayListBuilder::GetImageDecodeFlags() const {
uint32_t flags = imgIContainer::FLAG_ASYNC_NOTIFY;
if (mSyncDecodeImages) {
flags |= imgIContainer::FLAG_SYNC_DECODE;
} else {
flags |= imgIContainer::FLAG_SYNC_DECODE_IF_FAST;
}
if (mIsPaintingToWindow || mUseHighQualityScaling) {
flags |= imgIContainer::FLAG_HIGH_QUALITY_SCALING;
}
return flags;
}
void nsDisplayListBuilder::SubtractFromVisibleRegion(nsRegion* aVisibleRegion,
const nsRegion& aRegion) {
if (aRegion.IsEmpty()) {
return;
}
nsRegion tmp;
tmp.Sub(*aVisibleRegion, aRegion);
// Don't let *aVisibleRegion get too complex, but don't let it fluff out
// Do let aVisibleRegion get more complex if by doing so we reduce its
// area by at least half.
if (tmp.GetNumRects() <= 15 || tmp.Area() <= aVisibleRegion->Area() / 2) {
*aVisibleRegion = tmp;
}
}
nsCaret* nsDisplayListBuilder::GetCaret() {
RefPtr<nsCaret> caret = CurrentPresShellState()->mPresShell->GetCaret();
return caret;
}
void nsDisplayListBuilder::IncrementPresShellPaintCount(PresShell* aPresShell) {
if (mIsPaintingToWindow) {
aPresShell->IncrementPaintCount();
}
}
void nsDisplayListBuilder::EnterPresShell(const nsIFrame* aReferenceFrame,
bool aPointerEventsNoneDoc) {
PresShellState* state = mPresShellStates.AppendElement();
state->mPresShell = aReferenceFrame->PresShell();
state->mFirstFrameMarkedForDisplay = mFramesMarkedForDisplay.Length();
state->mFirstFrameWithOOFData = mFramesWithOOFData.Length();
nsIScrollableFrame* sf = state->mPresShell->GetRootScrollFrameAsScrollable();
if (sf && IsInSubdocument()) {
// We are forcing a rebuild of nsDisplayCanvasBackgroundColor to make sure
// that the canvas background color will be set correctly, and that only one
// unscrollable item will be created.
// This is done to avoid, for example, a case where only scrollbar frames
// are invalidated - we would skip creating nsDisplayCanvasBackgroundColor
// and possibly end up with an extra nsDisplaySolidColor item.
// We skip this for the root document, since we don't want to use
// MarkFrameForDisplayIfVisible before ComputeRebuildRegion. We'll
// do it manually there.
nsCanvasFrame* canvasFrame = do_QueryFrame(sf->GetScrolledFrame());
if (canvasFrame) {
MarkFrameForDisplayIfVisible(canvasFrame, aReferenceFrame);
}
}
#ifdef DEBUG
state->mAutoLayoutPhase.emplace(aReferenceFrame->PresContext(),
nsLayoutPhase::DisplayListBuilding);
#endif
state->mPresShell->UpdateCanvasBackground();
bool buildCaret = mBuildCaret;
if (mIgnoreSuppression || !state->mPresShell->IsPaintingSuppressed()) {
state->mIsBackgroundOnly = false;
} else {
state->mIsBackgroundOnly = true;
buildCaret = false;
}
bool pointerEventsNone = aPointerEventsNoneDoc;
if (IsInSubdocument()) {
pointerEventsNone |= mPresShellStates[mPresShellStates.Length() - 2]
.mInsidePointerEventsNoneDoc;
}
state->mInsidePointerEventsNoneDoc = pointerEventsNone;
state->mPresShellIgnoreScrollFrame =
state->mPresShell->IgnoringViewportScrolling()
? state->mPresShell->GetRootScrollFrame()
: nullptr;
nsPresContext* pc = aReferenceFrame->PresContext();
mIsInChromePresContext = pc->IsChrome();
nsIDocShell* docShell = pc->GetDocShell();
if (docShell) {
docShell->GetWindowDraggingAllowed(&mWindowDraggingAllowed);
}
state->mTouchEventPrefEnabledDoc = dom::TouchEvent::PrefEnabled(docShell);
if (!buildCaret) {
return;
}
state->mCaretFrame = [&]() -> nsIFrame* {
RefPtr<nsCaret> caret = state->mPresShell->GetCaret();
nsIFrame* currentCaret = caret->GetPaintGeometry(&mCaretRect);
if (!currentCaret) {
return nullptr;
}
// Check if the display root for the caret matches the display root that
// we're painting, and only use it if it matches. Likely we only need this
// for carets inside popups.
if (nsLayoutUtils::GetDisplayRootFrame(currentCaret) !=
nsLayoutUtils::GetDisplayRootFrame(aReferenceFrame)) {
return nullptr;
}
// Caret frames add visual area to their frame, but we don't update the
// overflow area. Use flags to make sure we build display items for that
// frame instead.
MOZ_ASSERT(currentCaret->PresShell() == state->mPresShell);
MarkFrameForDisplay(currentCaret, aReferenceFrame);
caret->SetLastPaintedFrame(currentCaret);
if (!mPaintedCarets.Contains(caret)) {
mPaintedCarets.AppendElement(std::move(caret));
}
return currentCaret;
}();
}
// A non-blank paint is a paint that does not just contain the canvas
// background.
static bool DisplayListIsNonBlank(nsDisplayList* aList) {
for (nsDisplayItem* i : *aList) {
switch (i->GetType()) {
case DisplayItemType::TYPE_COMPOSITOR_HITTEST_INFO:
case DisplayItemType::TYPE_CANVAS_BACKGROUND_COLOR:
case DisplayItemType::TYPE_CANVAS_BACKGROUND_IMAGE:
continue;
case DisplayItemType::TYPE_SOLID_COLOR:
case DisplayItemType::TYPE_BACKGROUND:
case DisplayItemType::TYPE_BACKGROUND_COLOR:
if (i->Frame()->IsCanvasFrame()) {
continue;
}
return true;
default:
return true;
}
}
return false;
}
// A contentful paint is a paint that does contains DOM content (text,
// images, non-blank canvases, SVG): "First Contentful Paint entry
// contains a DOMHighResTimeStamp reporting the time when the browser
// first rendered any text, image (including background images),
// non-white canvas or SVG. This excludes any content of iframes, but
// includes text with pending webfonts. This is the first time users
// could start consuming page content."
static bool DisplayListIsContentful(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList) {
for (nsDisplayItem* i : *aList) {
DisplayItemType type = i->GetType();
nsDisplayList* children = i->GetChildren();
switch (type) {
case DisplayItemType::TYPE_SUBDOCUMENT: // iframes are ignored
break;
// CANVASes check if they may have been modified (as a stand-in
// actually tracking all modifications)
default:
if (i->IsContentful()) {
bool dummy;
nsRect bound = i->GetBounds(aBuilder, &dummy);
if (!bound.IsEmpty()) {
return true;
}
}
if (children) {
if (DisplayListIsContentful(aBuilder, children)) {
return true;
}
}
break;
}
}
return false;
}
void nsDisplayListBuilder::LeavePresShell(const nsIFrame* aReferenceFrame,
nsDisplayList* aPaintedContents) {
NS_ASSERTION(
CurrentPresShellState()->mPresShell == aReferenceFrame->PresShell(),
"Presshell mismatch");
if (mIsPaintingToWindow && aPaintedContents) {
nsPresContext* pc = aReferenceFrame->PresContext();
if (!pc->HadNonBlankPaint()) {
if (!CurrentPresShellState()->mIsBackgroundOnly &&
DisplayListIsNonBlank(aPaintedContents)) {
pc->NotifyNonBlankPaint();
}
}
nsRootPresContext* rootPresContext = pc->GetRootPresContext();
if (!pc->HasStoppedGeneratingLCP() && rootPresContext) {
if (!CurrentPresShellState()->mIsBackgroundOnly) {
if (pc->HasEverBuiltInvisibleText() ||
DisplayListIsContentful(this, aPaintedContents)) {
pc->NotifyContentfulPaint();
}
}
}
}
ResetMarkedFramesForDisplayList(aReferenceFrame);
mPresShellStates.RemoveLastElement();
if (!mPresShellStates.IsEmpty()) {
nsPresContext* pc = CurrentPresContext();
nsIDocShell* docShell = pc->GetDocShell();
if (docShell) {
docShell->GetWindowDraggingAllowed(&mWindowDraggingAllowed);
}
mIsInChromePresContext = pc->IsChrome();
} else {
for (uint32_t i = 0; i < mFramesMarkedForDisplayIfVisible.Length(); ++i) {
UnmarkFrameForDisplayIfVisible(mFramesMarkedForDisplayIfVisible[i]);
}
mFramesMarkedForDisplayIfVisible.SetLength(0);
}
}
void nsDisplayListBuilder::FreeClipChains() {
// Iterate the clip chains from newest to oldest (forward
// iteration), so that we destroy descendants first which
// will drop the ref count on their ancestors.
DisplayItemClipChain** indirect = &mFirstClipChainToDestroy;
while (*indirect) {
if (!(*indirect)->mRefCount) {
DisplayItemClipChain* next = (*indirect)->mNextClipChainToDestroy;
mClipDeduplicator.erase(*indirect);
(*indirect)->DisplayItemClipChain::~DisplayItemClipChain();
Destroy(DisplayListArenaObjectId::CLIPCHAIN, *indirect);
*indirect = next;
} else {
indirect = &(*indirect)->mNextClipChainToDestroy;
}
}
}
void nsDisplayListBuilder::FreeTemporaryItems() {
for (nsDisplayItem* i : mTemporaryItems) {
// Temporary display items are not added to the frames.
MOZ_ASSERT(i->Frame());
i->RemoveFrame(i->Frame());
i->Destroy(this);
}
mTemporaryItems.Clear();
}
void nsDisplayListBuilder::ResetMarkedFramesForDisplayList(
const nsIFrame* aReferenceFrame) {
// Unmark and pop off the frames marked for display in this pres shell.
uint32_t firstFrameForShell =
CurrentPresShellState()->mFirstFrameMarkedForDisplay;
for (uint32_t i = firstFrameForShell; i < mFramesMarkedForDisplay.Length();
++i) {
UnmarkFrameForDisplay(mFramesMarkedForDisplay[i], aReferenceFrame);
}
mFramesMarkedForDisplay.SetLength(firstFrameForShell);
firstFrameForShell = CurrentPresShellState()->mFirstFrameWithOOFData;
for (uint32_t i = firstFrameForShell; i < mFramesWithOOFData.Length(); ++i) {
mFramesWithOOFData[i]->RemoveProperty(OutOfFlowDisplayDataProperty());
}
mFramesWithOOFData.SetLength(firstFrameForShell);
}
void nsDisplayListBuilder::ClearFixedBackgroundDisplayData() {
CurrentPresShellState()->mFixedBackgroundDisplayData = Nothing();
}
void nsDisplayListBuilder::MarkFramesForDisplayList(
nsIFrame* aDirtyFrame, const nsFrameList& aFrames) {
nsRect visibleRect = GetVisibleRect();
nsRect dirtyRect = GetDirtyRect();
// If we are entering content that is fixed to the RCD-RSF, we are
// crossing the async zoom container boundary, and need to convert from
// visual to layout coordinates.
if (ViewportFrame* viewportFrame = do_QueryFrame(aDirtyFrame)) {
if (IsForEventDelivery() && ShouldBuildAsyncZoomContainer() &&
viewportFrame->PresContext()->IsRootContentDocumentCrossProcess()) {
if (viewportFrame->PresShell()->GetRootScrollFrame()) {
#ifdef DEBUG
for (nsIFrame* f : aFrames) {
MOZ_ASSERT(ViewportUtils::IsZoomedContentRoot(f));
}
#endif
visibleRect = ViewportUtils::VisualToLayout(visibleRect,
viewportFrame->PresShell());
dirtyRect = ViewportUtils::VisualToLayout(dirtyRect,
viewportFrame->PresShell());
}
#ifdef DEBUG
else {
// This is an edge case that should only happen if we are in a
// document with a XUL root element so that it does not have a root
// scroll frame but it has fixed pos content and all of the frames in
// aFrames are that fixed pos content.
for (nsIFrame* f : aFrames) {
MOZ_ASSERT(!ViewportUtils::IsZoomedContentRoot(f) &&
f->GetParent() == aDirtyFrame &&
f->StyleDisplay()->mPosition ==
StylePositionProperty::Fixed);
}
// There's no root scroll frame so there can't be any zooming or async
// panning so we don't need to adjust the visible and dirty rects.
}
#endif
}
}
bool markedFrames = false;
for (nsIFrame* e : aFrames) {
// Skip the AccessibleCaret frame when building no caret.
if (!IsBuildingCaret()) {
nsIContent* content = e->GetContent();
if (content && content->IsInNativeAnonymousSubtree() &&
content->IsElement()) {
const nsAttrValue* classes = content->AsElement()->GetClasses();
if (classes &&
classes->Contains(nsGkAtoms::mozAccessiblecaret, eCaseMatters)) {
continue;
}
}
}
if (MarkOutOfFlowFrameForDisplay(aDirtyFrame, e, visibleRect, dirtyRect)) {
markedFrames = true;
}
}
if (markedFrames) {
// mClipState.GetClipChainForContainingBlockDescendants can return pointers
// to objects on the stack, so we need to clone the chain.
const DisplayItemClipChain* clipChain =
CopyWholeChain(mClipState.GetClipChainForContainingBlockDescendants());
const DisplayItemClipChain* combinedClipChain =
mClipState.GetCurrentCombinedClipChain(this);
const ActiveScrolledRoot* asr = mCurrentActiveScrolledRoot;
OutOfFlowDisplayData* data = new OutOfFlowDisplayData(
clipChain, combinedClipChain, asr, this->mCurrentScrollParentId,
visibleRect, dirtyRect);
aDirtyFrame->SetProperty(
nsDisplayListBuilder::OutOfFlowDisplayDataProperty(), data);
mFramesWithOOFData.AppendElement(aDirtyFrame);
}
if (!aDirtyFrame->GetParent()) {
// This is the viewport frame of aDirtyFrame's presshell.
// Store the current display data so that it can be used for fixed
// background images.
NS_ASSERTION(
CurrentPresShellState()->mPresShell == aDirtyFrame->PresShell(),
"Presshell mismatch");
MOZ_ASSERT(!CurrentPresShellState()->mFixedBackgroundDisplayData,
"already traversed this presshell's root frame?");
const DisplayItemClipChain* clipChain =
CopyWholeChain(mClipState.GetClipChainForContainingBlockDescendants());
const DisplayItemClipChain* combinedClipChain =
mClipState.GetCurrentCombinedClipChain(this);
const ActiveScrolledRoot* asr = mCurrentActiveScrolledRoot;
CurrentPresShellState()->mFixedBackgroundDisplayData.emplace(
clipChain, combinedClipChain, asr, this->mCurrentScrollParentId,
GetVisibleRect(), GetDirtyRect());
}
}
/**
* Mark all preserve-3d children with
* NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO to make sure
* nsIFrame::BuildDisplayListForChild() would visit them. Also compute
* dirty rect for preserve-3d children.
*
* @param aDirtyFrame is the frame to mark children extending context.
*/
void nsDisplayListBuilder::MarkPreserve3DFramesForDisplayList(
nsIFrame* aDirtyFrame) {
for (const auto& childList : aDirtyFrame->ChildLists()) {
for (nsIFrame* child : childList.mList) {
if (child->Combines3DTransformWithAncestors()) {
MarkFrameForDisplay(child, aDirtyFrame);
}
if (child->IsBlockWrapper()) {
// Mark preserve-3d frames inside the block wrapper.
MarkPreserve3DFramesForDisplayList(child);
}
}
}
}
ActiveScrolledRoot* nsDisplayListBuilder::AllocateActiveScrolledRoot(
const ActiveScrolledRoot* aParent, nsIScrollableFrame* aScrollableFrame) {
RefPtr<ActiveScrolledRoot> asr = ActiveScrolledRoot::CreateASRForFrame(
aParent, aScrollableFrame, IsRetainingDisplayList());
mActiveScrolledRoots.AppendElement(asr);
return asr;
}
const DisplayItemClipChain* nsDisplayListBuilder::AllocateDisplayItemClipChain(
const DisplayItemClip& aClip, const ActiveScrolledRoot* aASR,
const DisplayItemClipChain* aParent) {
MOZ_DIAGNOSTIC_ASSERT(!(aParent && aParent->mOnStack));
void* p = Allocate(sizeof(DisplayItemClipChain),
DisplayListArenaObjectId::CLIPCHAIN);
DisplayItemClipChain* c = new (KnownNotNull, p)
DisplayItemClipChain(aClip, aASR, aParent, mFirstClipChainToDestroy);
#if defined(DEBUG) || defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED)
c->mOnStack = false;
#endif
auto result = mClipDeduplicator.insert(c);
if (!result.second) {
// An equivalent clip chain item was already created, so let's return that
// instead. Destroy the one we just created.
// Note that this can cause clip chains from different coordinate systems to
// collapse into the same clip chain object, because clip chains do not keep
// track of the reference frame that they were created in.
c->DisplayItemClipChain::~DisplayItemClipChain();
Destroy(DisplayListArenaObjectId::CLIPCHAIN, c);
return *(result.first);
}
mFirstClipChainToDestroy = c;
return c;
}
struct ClipChainItem {
DisplayItemClip clip;
const ActiveScrolledRoot* asr;
};
static const DisplayItemClipChain* FindCommonAncestorClipForIntersection(
const DisplayItemClipChain* aOne, const DisplayItemClipChain* aTwo) {
for (const ActiveScrolledRoot* asr =
ActiveScrolledRoot::PickDescendant(aOne->mASR, aTwo->mASR);
asr; asr = asr->mParent) {
if (aOne == aTwo) {
return aOne;
}
if (aOne->mASR == asr) {
aOne = aOne->mParent;
}
if (aTwo->mASR == asr) {
aTwo = aTwo->mParent;
}
if (!aOne) {
return aTwo;
}
if (!aTwo) {
return aOne;
}
}
return nullptr;
}
const DisplayItemClipChain* nsDisplayListBuilder::CreateClipChainIntersection(
const DisplayItemClipChain* aAncestor,
const DisplayItemClipChain* aLeafClip1,
const DisplayItemClipChain* aLeafClip2) {
AutoTArray<ClipChainItem, 8> intersectedClips;
const DisplayItemClipChain* clip1 = aLeafClip1;
const DisplayItemClipChain* clip2 = aLeafClip2;
const ActiveScrolledRoot* asr = ActiveScrolledRoot::PickDescendant(
clip1 ? clip1->mASR : nullptr, clip2 ? clip2->mASR : nullptr);
// Build up the intersection from the leaf to the root and put it into
// intersectedClips. The loop below will convert intersectedClips into an
// actual DisplayItemClipChain.
// (We need to do this in two passes because we need the parent clip in order
// to create the DisplayItemClipChain object, but the parent clip has not
// been created at that point.)
while (!aAncestor || asr != aAncestor->mASR) {
if (clip1 && clip1->mASR == asr) {
if (clip2 && clip2->mASR == asr) {
DisplayItemClip intersection = clip1->mClip;
intersection.IntersectWith(clip2->mClip);
intersectedClips.AppendElement(ClipChainItem{intersection, asr});
clip2 = clip2->mParent;
} else {
intersectedClips.AppendElement(ClipChainItem{clip1->mClip, asr});
}
clip1 = clip1->mParent;
} else if (clip2 && clip2->mASR == asr) {
intersectedClips.AppendElement(ClipChainItem{clip2->mClip, asr});
clip2 = clip2->mParent;
}
if (!asr) {
MOZ_ASSERT(!aAncestor, "We should have exited this loop earlier");
break;
}
asr = asr->mParent;
}
// Convert intersectedClips into a DisplayItemClipChain.
const DisplayItemClipChain* parentSC = aAncestor;
for (auto& sc : Reversed(intersectedClips)) {
parentSC = AllocateDisplayItemClipChain(sc.clip, sc.asr, parentSC);
}
return parentSC;
}
const DisplayItemClipChain* nsDisplayListBuilder::CreateClipChainIntersection(
const DisplayItemClipChain* aLeafClip1,
const DisplayItemClipChain* aLeafClip2) {
// aLeafClip2 might be a reference to a clip on the stack. We need to make
// sure that CreateClipChainIntersection will allocate the actual intersected
// clip in the builder's arena, so for the aLeafClip1 == nullptr case,
// we supply nullptr as the common ancestor so that
// CreateClipChainIntersection clones the whole chain.
const DisplayItemClipChain* ancestorClip =
aLeafClip1 ? FindCommonAncestorClipForIntersection(aLeafClip1, aLeafClip2)
: nullptr;
return CreateClipChainIntersection(ancestorClip, aLeafClip1, aLeafClip2);
}
const DisplayItemClipChain* nsDisplayListBuilder::CopyWholeChain(
const DisplayItemClipChain* aClipChain) {
return CreateClipChainIntersection(nullptr, aClipChain, nullptr);
}
const nsIFrame* nsDisplayListBuilder::FindReferenceFrameFor(
const nsIFrame* aFrame, nsPoint* aOffset) const {
auto MaybeApplyAdditionalOffset = [&]() {
if (auto offset = AdditionalOffset()) {
*aOffset += *offset;
}
};
if (aFrame == mCurrentFrame) {
if (aOffset) {
*aOffset = mCurrentOffsetToReferenceFrame;
}
return mCurrentReferenceFrame;
}
for (const nsIFrame* f = aFrame; f;
f = nsLayoutUtils::GetCrossDocParentFrameInProcess(f)) {
if (f == mReferenceFrame || f->IsTransformed()) {
if (aOffset) {
*aOffset = aFrame->GetOffsetToCrossDoc(f);
MaybeApplyAdditionalOffset();
}
return f;
}
}
if (aOffset) {
*aOffset = aFrame->GetOffsetToCrossDoc(mReferenceFrame);
MaybeApplyAdditionalOffset();
}
return mReferenceFrame;
}
// Sticky frames are active if their nearest scrollable frame is also active.
static bool IsStickyFrameActive(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame) {
MOZ_ASSERT(aFrame->StyleDisplay()->mPosition ==
StylePositionProperty::Sticky);
StickyScrollContainer* stickyScrollContainer =
StickyScrollContainer::GetStickyScrollContainerForFrame(aFrame);
return stickyScrollContainer &&
stickyScrollContainer->ScrollFrame()->IsMaybeAsynchronouslyScrolled();
}
bool nsDisplayListBuilder::IsAnimatedGeometryRoot(nsIFrame* aFrame,
nsIFrame** aParent) {
if (aFrame == mReferenceFrame) {
return true;
}
if (!IsPaintingToWindow()) {
if (aParent) {
*aParent = nsLayoutUtils::GetCrossDocParentFrameInProcess(aFrame);
}
return false;
}
nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(aFrame);
if (!parent) {
return true;
}
*aParent = parent;
if (aFrame->StyleDisplay()->mPosition == StylePositionProperty::Sticky &&
IsStickyFrameActive(this, aFrame)) {
return true;
}
if (aFrame->IsTransformed()) {
if (EffectCompositor::HasAnimationsForCompositor(
aFrame, DisplayItemType::TYPE_TRANSFORM)) {
return true;
}
}
LayoutFrameType parentType = parent->Type();
if (parentType == LayoutFrameType::Scroll ||
parentType == LayoutFrameType::ListControl) {
nsIScrollableFrame* sf = do_QueryFrame(parent);
if (sf->GetScrolledFrame() == aFrame) {
MOZ_ASSERT(!aFrame->IsTransformed());
return sf->IsMaybeAsynchronouslyScrolled();
}
}
return false;
}
nsIFrame* nsDisplayListBuilder::FindAnimatedGeometryRootFrameFor(
nsIFrame* aFrame) {
MOZ_ASSERT(nsLayoutUtils::IsAncestorFrameCrossDocInProcess(
RootReferenceFrame(), aFrame));
nsIFrame* cursor = aFrame;
while (cursor != RootReferenceFrame()) {
nsIFrame* next;
if (IsAnimatedGeometryRoot(cursor, &next)) {
return cursor;
}
cursor = next;
}
return cursor;
}
static nsRect ApplyAllClipNonRoundedIntersection(
const DisplayItemClipChain* aClipChain, const nsRect& aRect) {
nsRect result = aRect;
while (aClipChain) {
result = aClipChain->mClip.ApplyNonRoundedIntersection(result);
aClipChain = aClipChain->mParent;
}
return result;
}
void nsDisplayListBuilder::AdjustWindowDraggingRegion(nsIFrame* aFrame) {
if (!mWindowDraggingAllowed || !IsForPainting()) {
return;
}
const nsStyleUIReset* styleUI = aFrame->StyleUIReset();
if (styleUI->mWindowDragging == StyleWindowDragging::Default) {
// This frame has the default value and doesn't influence the window
// dragging region.
return;
}
LayoutDeviceToLayoutDeviceMatrix4x4 referenceFrameToRootReferenceFrame;
// The const_cast is for nsLayoutUtils::GetTransformToAncestor.
nsIFrame* referenceFrame =
const_cast<nsIFrame*>(FindReferenceFrameFor(aFrame));
if (IsInTransform()) {
// Only support 2d rectilinear transforms. Transform support is needed for
// the horizontal flip transform that's applied to the urlbar textbox in
// RTL mode - it should be able to exclude itself from the draggable region.
referenceFrameToRootReferenceFrame =
ViewAs<LayoutDeviceToLayoutDeviceMatrix4x4>(
nsLayoutUtils::GetTransformToAncestor(RelativeTo{referenceFrame},
RelativeTo{mReferenceFrame})
.GetMatrix());
Matrix referenceFrameToRootReferenceFrame2d;
if (!referenceFrameToRootReferenceFrame.Is2D(
&referenceFrameToRootReferenceFrame2d) ||
!referenceFrameToRootReferenceFrame2d.IsRectilinear()) {
return;
}
} else {
MOZ_ASSERT(referenceFrame == mReferenceFrame,
"referenceFrameToRootReferenceFrame needs to be adjusted");
}
// We do some basic visibility checking on the frame's border box here.
// We intersect it both with the current dirty rect and with the current
// clip. Either one is just a conservative approximation on its own, but
// their intersection luckily works well enough for our purposes, so that
// we don't have to do full-blown visibility computations.
// The most important case we need to handle is the scrolled-off tab:
// If the tab bar overflows, tab parts that are clipped by the scrollbox
// should not be allowed to interfere with the window dragging region. Using
// just the current DisplayItemClip is not enough to cover this case
// completely because clips are reset while building stacking context
// contents, so for example we'd fail to clip frames that have a clip path
// applied to them. But the current dirty rect doesn't get reset in that
// case, so we use it to make this case work.
nsRect borderBox = aFrame->GetRectRelativeToSelf().Intersect(mVisibleRect);
borderBox += ToReferenceFrame(aFrame);
const DisplayItemClipChain* clip =
ClipState().GetCurrentCombinedClipChain(this);
borderBox = ApplyAllClipNonRoundedIntersection(clip, borderBox);
if (borderBox.IsEmpty()) {
return;
}
LayoutDeviceRect devPixelBorderBox = LayoutDevicePixel::FromAppUnits(
borderBox, aFrame->PresContext()->AppUnitsPerDevPixel());
LayoutDeviceRect transformedDevPixelBorderBox =
TransformBy(referenceFrameToRootReferenceFrame, devPixelBorderBox);
transformedDevPixelBorderBox.Round();
LayoutDeviceIntRect transformedDevPixelBorderBoxInt;
if (!transformedDevPixelBorderBox.ToIntRect(
&transformedDevPixelBorderBoxInt)) {
return;
}
LayoutDeviceIntRegion& region =
styleUI->mWindowDragging == StyleWindowDragging::Drag
? mWindowDraggingRegion
: mWindowNoDraggingRegion;
if (!IsRetainingDisplayList()) {
region.OrWith(transformedDevPixelBorderBoxInt);
return;
}
gfx::IntRect rect(transformedDevPixelBorderBoxInt.ToUnknownRect());
if (styleUI->mWindowDragging == StyleWindowDragging::Drag) {
mRetainedWindowDraggingRegion.Add(aFrame, rect);
} else {
mRetainedWindowNoDraggingRegion.Add(aFrame, rect);
}
}
LayoutDeviceIntRegion nsDisplayListBuilder::GetWindowDraggingRegion() const {
LayoutDeviceIntRegion result;
if (!IsRetainingDisplayList()) {
result.Sub(mWindowDraggingRegion, mWindowNoDraggingRegion);
return result;
}
LayoutDeviceIntRegion dragRegion =
mRetainedWindowDraggingRegion.ToLayoutDeviceIntRegion();
LayoutDeviceIntRegion noDragRegion =
mRetainedWindowNoDraggingRegion.ToLayoutDeviceIntRegion();
result.Sub(dragRegion, noDragRegion);
return result;
}
void nsDisplayTransform::AddSizeOfExcludingThis(nsWindowSizes& aSizes) const {
nsPaintedDisplayItem::AddSizeOfExcludingThis(aSizes);
aSizes.mLayoutRetainedDisplayListSize +=
aSizes.mState.mMallocSizeOf(mTransformPreserves3D.get());
}
void nsDisplayListBuilder::AddSizeOfExcludingThis(nsWindowSizes& aSizes) const {
mPool.AddSizeOfExcludingThis(aSizes, Arena::ArenaKind::DisplayList);
size_t n = 0;
MallocSizeOf mallocSizeOf = aSizes.mState.mMallocSizeOf;
n += mDocumentWillChangeBudgets.ShallowSizeOfExcludingThis(mallocSizeOf);
n += mFrameWillChangeBudgets.ShallowSizeOfExcludingThis(mallocSizeOf);
n += mEffectsUpdates.ShallowSizeOfExcludingThis(mallocSizeOf);
n += mRetainedWindowDraggingRegion.SizeOfExcludingThis(mallocSizeOf);
n += mRetainedWindowNoDraggingRegion.SizeOfExcludingThis(mallocSizeOf);
n += mRetainedWindowOpaqueRegion.SizeOfExcludingThis(mallocSizeOf);
// XXX can't measure mClipDeduplicator since it uses std::unordered_set.
aSizes.mLayoutRetainedDisplayListSize += n;
}
void RetainedDisplayList::AddSizeOfExcludingThis(nsWindowSizes& aSizes) const {
for (nsDisplayItem* item : *this) {
item->AddSizeOfExcludingThis(aSizes);
if (RetainedDisplayList* children = item->GetChildren()) {
children->AddSizeOfExcludingThis(aSizes);
}
}
size_t n = 0;
n += mDAG.mDirectPredecessorList.ShallowSizeOfExcludingThis(
aSizes.mState.mMallocSizeOf);
n += mDAG.mNodesInfo.ShallowSizeOfExcludingThis(aSizes.mState.mMallocSizeOf);
n += mOldItems.ShallowSizeOfExcludingThis(aSizes.mState.mMallocSizeOf);
aSizes.mLayoutRetainedDisplayListSize += n;
}
size_t nsDisplayListBuilder::WeakFrameRegion::SizeOfExcludingThis(
MallocSizeOf aMallocSizeOf) const {
size_t n = 0;
n += mFrames.ShallowSizeOfExcludingThis(aMallocSizeOf);
for (const auto& frame : mFrames) {
const UniquePtr<WeakFrame>& weakFrame = frame.mWeakFrame;
n += aMallocSizeOf(weakFrame.get());
}
n += mRects.ShallowSizeOfExcludingThis(aMallocSizeOf);
return n;
}
/**
* Removes modified frames and rects from this WeakFrameRegion.
*/
void nsDisplayListBuilder::WeakFrameRegion::RemoveModifiedFramesAndRects() {
MOZ_ASSERT(mFrames.Length() == mRects.Length());
uint32_t i = 0;
uint32_t length = mFrames.Length();
while (i < length) {
auto& wrapper = mFrames[i];
if (!wrapper.mWeakFrame->IsAlive() ||
AnyContentAncestorModified(wrapper.mWeakFrame->GetFrame())) {
// To avoid multiple O(n) shifts in the array, move the last element of
// the array to the current position and decrease the array length.
mFrameSet.Remove(wrapper.mFrame);
mFrames[i] = std::move(mFrames[length - 1]);
mRects[i] = std::move(mRects[length - 1]);
length--;
} else {
i++;
}
}
mFrames.TruncateLength(length);
mRects.TruncateLength(length);
}
void nsDisplayListBuilder::RemoveModifiedWindowRegions() {
mRetainedWindowDraggingRegion.RemoveModifiedFramesAndRects();
mRetainedWindowNoDraggingRegion.RemoveModifiedFramesAndRects();
mRetainedWindowOpaqueRegion.RemoveModifiedFramesAndRects();
}
void nsDisplayListBuilder::ClearRetainedWindowRegions() {
mRetainedWindowDraggingRegion.Clear();
mRetainedWindowNoDraggingRegion.Clear();
mRetainedWindowOpaqueRegion.Clear();
}
const uint32_t gWillChangeAreaMultiplier = 3;
static uint32_t GetLayerizationCost(const nsSize& aSize) {
// There's significant overhead for each layer created from Gecko
// (IPC+Shared Objects) and from the backend (like an OpenGL texture).
// Therefore we set a minimum cost threshold of a 64x64 area.
const int minBudgetCost = 64 * 64;
const uint32_t budgetCost = std::max(
minBudgetCost, nsPresContext::AppUnitsToIntCSSPixels(aSize.width) *
nsPresContext::AppUnitsToIntCSSPixels(aSize.height));
return budgetCost;
}
bool nsDisplayListBuilder::AddToWillChangeBudget(nsIFrame* aFrame,
const nsSize& aSize) {
MOZ_ASSERT(IsForPainting());
if (aFrame->MayHaveWillChangeBudget()) {
// The frame is already in the will-change budget.
return true;
}
const nsPresContext* presContext = aFrame->PresContext();
const nsRect area = presContext->GetVisibleArea();
const uint32_t budgetLimit =
nsPresContext::AppUnitsToIntCSSPixels(area.width) *
nsPresContext::AppUnitsToIntCSSPixels(area.height);
const uint32_t cost = GetLayerizationCost(aSize);
DocumentWillChangeBudget& documentBudget =
mDocumentWillChangeBudgets.LookupOrInsert(presContext);
const bool onBudget =
(documentBudget + cost) / gWillChangeAreaMultiplier < budgetLimit;
if (onBudget) {
documentBudget += cost;
mFrameWillChangeBudgets.InsertOrUpdate(
aFrame, FrameWillChangeBudget(presContext, cost));
aFrame->SetMayHaveWillChangeBudget(true);
}
return onBudget;
}
bool nsDisplayListBuilder::IsInWillChangeBudget(nsIFrame* aFrame,
const nsSize& aSize) {
if (!IsForPainting()) {
// If this nsDisplayListBuilder is not for painting, the layerization should
// not matter. Do the simple thing and return false.
return false;
}
const bool onBudget = AddToWillChangeBudget(aFrame, aSize);
if (onBudget) {
return true;
}
auto* pc = aFrame->PresContext();
auto* doc = pc->Document();
if (!doc->HasWarnedAbout(Document::eIgnoringWillChangeOverBudget)) {
AutoTArray<nsString, 2> params;
params.AppendElement()->AppendInt(gWillChangeAreaMultiplier);
nsRect area = pc->GetVisibleArea();
uint32_t budgetLimit = nsPresContext::AppUnitsToIntCSSPixels(area.width) *
nsPresContext::AppUnitsToIntCSSPixels(area.height);
params.AppendElement()->AppendInt(budgetLimit);
doc->WarnOnceAbout(Document::eIgnoringWillChangeOverBudget, false, params);
}
return false;
}
void nsDisplayListBuilder::ClearWillChangeBudgetStatus(nsIFrame* aFrame) {
MOZ_ASSERT(IsForPainting());
if (!aFrame->MayHaveWillChangeBudget()) {
return;
}
aFrame->SetMayHaveWillChangeBudget(false);
RemoveFromWillChangeBudgets(aFrame);
}
void nsDisplayListBuilder::RemoveFromWillChangeBudgets(const nsIFrame* aFrame) {
if (auto entry = mFrameWillChangeBudgets.Lookup(aFrame)) {
const FrameWillChangeBudget& frameBudget = entry.Data();
auto documentBudget =
mDocumentWillChangeBudgets.Lookup(frameBudget.mPresContext);
if (documentBudget) {
*documentBudget -= frameBudget.mUsage;
}
entry.Remove();
}
}
void nsDisplayListBuilder::ClearWillChangeBudgets() {
mFrameWillChangeBudgets.Clear();
mDocumentWillChangeBudgets.Clear();
}
void nsDisplayListBuilder::EnterSVGEffectsContents(
nsIFrame* aEffectsFrame, nsDisplayList* aHoistedItemsStorage) {
MOZ_ASSERT(aHoistedItemsStorage);
if (mSVGEffectsFrames.IsEmpty()) {
MOZ_ASSERT(!mScrollInfoItemsForHoisting);
mScrollInfoItemsForHoisting = aHoistedItemsStorage;
}
mSVGEffectsFrames.AppendElement(aEffectsFrame);
}
void nsDisplayListBuilder::ExitSVGEffectsContents() {
MOZ_ASSERT(!mSVGEffectsFrames.IsEmpty());
mSVGEffectsFrames.RemoveLastElement();
MOZ_ASSERT(mScrollInfoItemsForHoisting);
if (mSVGEffectsFrames.IsEmpty()) {
mScrollInfoItemsForHoisting = nullptr;
}
}
bool nsDisplayListBuilder::ShouldBuildScrollInfoItemsForHoisting() const {
/*
* Note: if changing the conditions under which scroll info layers
* are created, make a corresponding change to
* ScrollFrameWillBuildScrollInfoLayer() in nsSliderFrame.cpp.
*/
for (nsIFrame* frame : mSVGEffectsFrames) {
if (SVGIntegrationUtils::UsesSVGEffectsNotSupportedInCompositor(frame)) {
return true;
}
}
return false;
}
void nsDisplayListBuilder::AppendNewScrollInfoItemForHoisting(
nsDisplayScrollInfoLayer* aScrollInfoItem) {
MOZ_ASSERT(ShouldBuildScrollInfoItemsForHoisting());
MOZ_ASSERT(mScrollInfoItemsForHoisting);
mScrollInfoItemsForHoisting->AppendToTop(aScrollInfoItem);
}
void nsDisplayListBuilder::BuildCompositorHitTestInfoIfNeeded(
nsIFrame* aFrame, nsDisplayList* aList) {
MOZ_ASSERT(aFrame);
MOZ_ASSERT(aList);
if (!BuildCompositorHitTestInfo()) {
return;
}
const CompositorHitTestInfo info = aFrame->GetCompositorHitTestInfo(this);
if (info != CompositorHitTestInvisibleToHit) {
aList->AppendNewToTop<nsDisplayCompositorHitTestInfo>(this, aFrame);
}
}
void nsDisplayListBuilder::AddReusableDisplayItem(nsDisplayItem* aItem) {
mReuseableItems.Insert(aItem);
}
void nsDisplayListBuilder::RemoveReusedDisplayItem(nsDisplayItem* aItem) {
MOZ_ASSERT(aItem->IsReusedItem());
mReuseableItems.Remove(aItem);
}
void nsDisplayListBuilder::ClearReuseableDisplayItems() {
const size_t total = mReuseableItems.Count();
size_t reused = 0;
for (auto* item : mReuseableItems) {
if (item->IsReusedItem()) {
reused++;
item->SetReusable();
} else {
item->Destroy(this);
}
}
DL_LOGI("RDL - Reused %zu of %zu SC display items", reused, total);
mReuseableItems.Clear();
}
void nsDisplayListBuilder::ReuseDisplayItem(nsDisplayItem* aItem) {
const auto* previous = mCurrentContainerASR;
const auto* asr = aItem->GetActiveScrolledRoot();
mCurrentContainerASR =
ActiveScrolledRoot::PickAncestor(asr, mCurrentContainerASR);
if (previous != mCurrentContainerASR) {
DL_LOGV("RDL - Changed mCurrentContainerASR from %p to %p", previous,
mCurrentContainerASR);
}
aItem->SetReusedItem();
}
void nsDisplayListSet::CopyTo(const nsDisplayListSet& aDestination) const {
for (size_t i = 0; i < mLists.size(); ++i) {
auto* from = mLists[i];
auto* to = aDestination.mLists[i];
from->CopyTo(to);
}
}
void nsDisplayListSet::MoveTo(const nsDisplayListSet& aDestination) const {
aDestination.BorderBackground()->AppendToTop(BorderBackground());
aDestination.BlockBorderBackgrounds()->AppendToTop(BlockBorderBackgrounds());
aDestination.Floats()->AppendToTop(Floats());
aDestination.Content()->AppendToTop(Content());
aDestination.PositionedDescendants()->AppendToTop(PositionedDescendants());
aDestination.Outlines()->AppendToTop(Outlines());
}
nsRect nsDisplayList::GetClippedBounds(nsDisplayListBuilder* aBuilder) const {
nsRect bounds;
for (nsDisplayItem* i : *this) {
bounds.UnionRect(bounds, i->GetClippedBounds(aBuilder));
}
return bounds;
}
nsRect nsDisplayList::GetClippedBoundsWithRespectToASR(
nsDisplayListBuilder* aBuilder, const ActiveScrolledRoot* aASR,
nsRect* aBuildingRect) const {
nsRect bounds;
for (nsDisplayItem* i : *this) {
nsRect r = i->GetClippedBounds(aBuilder);
if (aASR != i->GetActiveScrolledRoot() && !r.IsEmpty()) {
if (Maybe<nsRect> clip = i->GetClipWithRespectToASR(aBuilder, aASR)) {
r = clip.ref();
}
}
if (aBuildingRect) {
aBuildingRect->UnionRect(*aBuildingRect, i->GetBuildingRect());
}
bounds.UnionRect(bounds, r);
}
return bounds;
}
nsRect nsDisplayList::GetBuildingRect() const {
nsRect result;
for (nsDisplayItem* i : *this) {
result.UnionRect(result, i->GetBuildingRect());
}
return result;
}
WindowRenderer* nsDisplayListBuilder::GetWidgetWindowRenderer(nsView** aView) {
if (aView) {
*aView = RootReferenceFrame()->GetView();
}
if (RootReferenceFrame() !=
nsLayoutUtils::GetDisplayRootFrame(RootReferenceFrame())) {
return nullptr;
}
nsIWidget* window = RootReferenceFrame()->GetNearestWidget();
if (window) {
return window->GetWindowRenderer();
}
return nullptr;
}
WebRenderLayerManager* nsDisplayListBuilder::GetWidgetLayerManager(
nsView** aView) {
WindowRenderer* renderer = GetWidgetWindowRenderer();
if (renderer) {
return renderer->AsWebRender();
}
return nullptr;
}
void nsDisplayList::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx,
int32_t aAppUnitsPerDevPixel) {
FlattenedDisplayListIterator iter(aBuilder, this);
while (iter.HasNext()) {
nsPaintedDisplayItem* item = iter.GetNextItem()->AsPaintedDisplayItem();
if (!item) {
continue;
}
nsRect visible = item->GetClippedBounds(aBuilder);
visible = visible.Intersect(item->GetPaintRect(aBuilder, aCtx));
if (visible.IsEmpty()) {
continue;
}
DisplayItemClip currentClip = item->GetClip();
if (currentClip.HasClip()) {
aCtx->Save();
if (currentClip.IsRectClippedByRoundedCorner(visible)) {
currentClip.ApplyTo(aCtx, aAppUnitsPerDevPixel);
} else {
currentClip.ApplyRectTo(aCtx, aAppUnitsPerDevPixel);
}
}
aCtx->NewPath();
item->Paint(aBuilder, aCtx);
if (currentClip.HasClip()) {
aCtx->Restore();
}
}
}
/**
* We paint by executing a layer manager transaction, constructing a
* single layer representing the display list, and then making it the
* root of the layer manager, drawing into the PaintedLayers.
*/
void nsDisplayList::PaintRoot(nsDisplayListBuilder* aBuilder, gfxContext* aCtx,
uint32_t aFlags,
Maybe<double> aDisplayListBuildTime) {
AUTO_PROFILER_LABEL("nsDisplayList::PaintRoot", GRAPHICS);
RefPtr<WebRenderLayerManager> layerManager;
WindowRenderer* renderer = nullptr;
bool widgetTransaction = false;
bool doBeginTransaction = true;
nsView* view = nullptr;
if (aFlags & PAINT_USE_WIDGET_LAYERS) {
renderer = aBuilder->GetWidgetWindowRenderer(&view);
if (renderer) {
// The fallback renderer doesn't retain any content, so it's
// not meaningful to use it when drawing to an external context.
if (aCtx && renderer->AsFallback()) {
MOZ_ASSERT(!(aFlags & PAINT_EXISTING_TRANSACTION));
renderer = nullptr;
} else {
layerManager = renderer->AsWebRender();
doBeginTransaction = !(aFlags & PAINT_EXISTING_TRANSACTION);
widgetTransaction = true;
}
}
}
nsIFrame* frame = aBuilder->RootReferenceFrame();
nsPresContext* presContext = frame->PresContext();
PresShell* presShell = presContext->PresShell();
Document* document = presShell->GetDocument();
ScopeExit g([&]() {
#ifdef DEBUG
MOZ_ASSERT(!layerManager || !layerManager->GetTarget());
#endif
// For layers-free mode, we check the invalidation state bits in the
// EndTransaction. So we clear the invalidation state bits after
// EndTransaction.
if (widgetTransaction ||
// SVG-as-an-image docs don't paint as part of the retained layer tree,
// but they still need the invalidation state bits cleared in order for
// invalidation for CSS/SMIL animation to work properly.
(document && document->IsBeingUsedAsImage())) {
DL_LOGD("Clearing invalidation state bits");
frame->ClearInvalidationStateBits();
}
});
if (!renderer) {
if (!aCtx) {
NS_WARNING("Nowhere to paint into");
return;
}
bool prevIsCompositingCheap = aBuilder->SetIsCompositingCheap(false);
Paint(aBuilder, aCtx, presContext->AppUnitsPerDevPixel());
aBuilder->SetIsCompositingCheap(prevIsCompositingCheap);
return;
}
if (renderer->GetBackendType() == LayersBackend::LAYERS_WR) {
MOZ_ASSERT(layerManager);
if (doBeginTransaction) {
if (aCtx) {
if (!layerManager->BeginTransactionWithTarget(aCtx, nsCString())) {
return;
}
} else {
if (!layerManager->BeginTransaction(nsCString())) {
return;
}
}
}
bool prevIsCompositingCheap = aBuilder->SetIsCompositingCheap(true);
layerManager->SetTransactionIdAllocator(presContext->RefreshDriver());
bool sent = false;
if (aFlags & PAINT_IDENTICAL_DISPLAY_LIST) {
MOZ_ASSERT(!aCtx);
sent = layerManager->EndEmptyTransaction();
}
if (!sent) {
auto* wrManager = static_cast<WebRenderLayerManager*>(layerManager.get());
nsIDocShell* docShell = presContext->GetDocShell();
WrFiltersHolder wrFilters;
gfx::Matrix5x4* colorMatrix =
nsDocShell::Cast(docShell)->GetColorMatrix();
if (colorMatrix) {
wrFilters.filters.AppendElement(
wr::FilterOp::ColorMatrix(colorMatrix->components));
}
wrManager->EndTransactionWithoutLayer(this, aBuilder,
std::move(wrFilters), nullptr,
aDisplayListBuildTime.valueOr(0.0));
}
aBuilder->SetIsCompositingCheap(prevIsCompositingCheap);
if (presContext->RefreshDriver()->HasScheduleFlush()) {
presContext->NotifyInvalidation(layerManager->GetLastTransactionId(),
frame->GetRect());
}
return;
}
FallbackRenderer* fallback = renderer->AsFallback();
MOZ_ASSERT(fallback);
if (doBeginTransaction) {
MOZ_ASSERT(!aCtx);
if (!fallback->BeginTransaction()) {
return;
}
}
bool temp = aBuilder->SetIsCompositingCheap(renderer->IsCompositingCheap());
fallback->EndTransactionWithList(aBuilder, this,
presContext->AppUnitsPerDevPixel(),
WindowRenderer::END_DEFAULT);
aBuilder->SetIsCompositingCheap(temp);
}
void nsDisplayList::DeleteAll(nsDisplayListBuilder* aBuilder) {
for (auto* item : TakeItems()) {
item->Destroy(aBuilder);
}
}
static bool IsFrameReceivingPointerEvents(nsIFrame* aFrame) {
return aFrame->Style()->PointerEvents() != StylePointerEvents::None;
}
// A list of frames, and their z depth. Used for sorting
// the results of hit testing.
struct FramesWithDepth {
explicit FramesWithDepth(float aDepth) : mDepth(aDepth) {}
bool operator<(const FramesWithDepth& aOther) const {
if (!FuzzyEqual(mDepth, aOther.mDepth, 0.1f)) {
// We want to sort so that the shallowest item (highest depth value) is
// first
return mDepth > aOther.mDepth;
}
return false;
}
bool operator==(const FramesWithDepth& aOther) const {
return this == &aOther;
}
float mDepth;
nsTArray<nsIFrame*> mFrames;
};
// Sort the frames by depth and then moves all the contained frames to the
// destination
static void FlushFramesArray(nsTArray<FramesWithDepth>& aSource,
nsTArray<nsIFrame*>* aDest) {
if (aSource.IsEmpty()) {
return;
}
aSource.StableSort();
uint32_t length = aSource.Length();
for (uint32_t i = 0; i < length; i++) {
aDest->AppendElements(std::move(aSource[i].mFrames));
}
aSource.Clear();
}
void nsDisplayList::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
nsDisplayItem::HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) const {
nsDisplayItem* item;
if (aState->mInPreserves3D) {
// Collect leaves of the current 3D rendering context.
for (nsDisplayItem* item : *this) {
auto itemType = item->GetType();
if (itemType != DisplayItemType::TYPE_TRANSFORM ||
!static_cast<nsDisplayTransform*>(item)->IsLeafOf3DContext()) {
item->HitTest(aBuilder, aRect, aState, aOutFrames);
} else {
// One of leaves in the current 3D rendering context.
aState->mItemBuffer.AppendElement(item);
}
}
return;
}
int32_t itemBufferStart = aState->mItemBuffer.Length();
for (nsDisplayItem* item : *this) {
aState->mItemBuffer.AppendElement(item);
}
AutoTArray<FramesWithDepth, 16> temp;
for (int32_t i = aState->mItemBuffer.Length() - 1; i >= itemBufferStart;
--i) {
// Pop element off the end of the buffer. We want to shorten the buffer
// so that recursive calls to HitTest have more buffer space.
item = aState->mItemBuffer[i];
aState->mItemBuffer.SetLength(i);
bool snap;
nsRect r = item->GetBounds(aBuilder, &snap).Intersect(aRect);
auto itemType = item->GetType();
bool same3DContext =
(itemType == DisplayItemType::TYPE_TRANSFORM &&
static_cast<nsDisplayTransform*>(item)->IsParticipating3DContext()) ||
(itemType == DisplayItemType::TYPE_PERSPECTIVE &&
item->Frame()->Extend3DContext());
if (same3DContext &&
(itemType != DisplayItemType::TYPE_TRANSFORM ||
!static_cast<nsDisplayTransform*>(item)->IsLeafOf3DContext())) {
if (!item->GetClip().MayIntersect(aRect)) {
continue;
}
AutoTArray<nsIFrame*, 1> neverUsed;
// Start gathering leaves of the 3D rendering context, and
// append leaves at the end of mItemBuffer. Leaves are
// processed at following iterations.
aState->mInPreserves3D = true;
item->HitTest(aBuilder, aRect, aState, &neverUsed);
aState->mInPreserves3D = false;
i = aState->mItemBuffer.Length();
continue;
}
if (same3DContext || item->GetClip().MayIntersect(r)) {
AutoTArray<nsIFrame*, 16> outFrames;
item->HitTest(aBuilder, aRect, aState, &outFrames);
// For 3d transforms with preserve-3d we add hit frames into the temp list
// so we can sort them later, otherwise we add them directly to the output
// list.
nsTArray<nsIFrame*>* writeFrames = aOutFrames;
if (item->GetType() == DisplayItemType::TYPE_TRANSFORM &&
static_cast<nsDisplayTransform*>(item)->IsLeafOf3DContext()) {
if (outFrames.Length()) {
nsDisplayTransform* transform =
static_cast<nsDisplayTransform*>(item);
nsPoint point = aRect.TopLeft();
// A 1x1 rect means a point, otherwise use the center of the rect
if (aRect.width != 1 || aRect.height != 1) {
point = aRect.Center();
}
temp.AppendElement(
FramesWithDepth(transform->GetHitDepthAtPoint(aBuilder, point)));
writeFrames = &temp[temp.Length() - 1].mFrames;
}
} else {
// We may have just finished a run of consecutive preserve-3d
// transforms, so flush these into the destination array before
// processing our frame list.
FlushFramesArray(temp, aOutFrames);
}
for (uint32_t j = 0; j < outFrames.Length(); j++) {
nsIFrame* f = outFrames.ElementAt(j);
// Filter out some frames depending on the type of hittest
// we are doing. For visibility tests, pass through all frames.
// For pointer tests, only pass through frames that are styled
// to receive pointer events.
if (aBuilder->HitTestIsForVisibility() ||
IsFrameReceivingPointerEvents(f)) {
writeFrames->AppendElement(f);
}
}
if (aBuilder->HitTestIsForVisibility()) {
aState->mHitOccludingItem = [&] {
if (aState->mHitOccludingItem) {
// We already hit something before.
return true;
}
if (aState->mCurrentOpacity == 1.0f &&
item->GetOpaqueRegion(aBuilder, &snap).Contains(aRect)) {
// An opaque item always occludes everything. Note that we need to
// check wrapping opacity and such as well.
return true;
}
float threshold = aBuilder->VisibilityThreshold();
if (threshold == 1.0f) {
return false;
}
float itemOpacity = [&] {
switch (item->GetType()) {
case DisplayItemType::TYPE_OPACITY:
return static_cast<nsDisplayOpacity*>(item)->GetOpacity();
case DisplayItemType::TYPE_BACKGROUND_COLOR:
return static_cast<nsDisplayBackgroundColor*>(item)
->GetOpacity();
default:
// Be conservative and assume it won't occlude other items.
return 0.0f;
}
}();
return itemOpacity * aState->mCurrentOpacity >= threshold;
}();
if (aState->mHitOccludingItem) {
// We're exiting early, so pop the remaining items off the buffer.
aState->mItemBuffer.TruncateLength(itemBufferStart);
break;
}
}
}
}
// Clear any remaining preserve-3d transforms.
FlushFramesArray(temp, aOutFrames);
NS_ASSERTION(aState->mItemBuffer.Length() == uint32_t(itemBufferStart),
"How did we forget to pop some elements?");
}
static nsIContent* FindContentInDocument(nsDisplayItem* aItem, Document* aDoc) {
nsIFrame* f = aItem->Frame();
while (f) {
nsPresContext* pc = f->PresContext();
if (pc->Document() == aDoc) {
return f->GetContent();
}
f = nsLayoutUtils::GetCrossDocParentFrameInProcess(
pc->PresShell()->GetRootFrame());
}
return nullptr;
}
struct ZSortItem {
nsDisplayItem* item;
int32_t zIndex;
explicit ZSortItem(nsDisplayItem* aItem)
: item(aItem), zIndex(aItem->ZIndex()) {}
operator nsDisplayItem*() { return item; }
};
struct ZOrderComparator {
bool LessThan(const ZSortItem& aLeft, const ZSortItem& aRight) const {
return aLeft.zIndex < aRight.zIndex;
}
};
void nsDisplayList::SortByZOrder() { Sort<ZSortItem>(ZOrderComparator()); }
struct ContentComparator {
nsIContent* mCommonAncestor;
explicit ContentComparator(nsIContent* aCommonAncestor)
: mCommonAncestor(aCommonAncestor) {}
bool LessThan(nsDisplayItem* aLeft, nsDisplayItem* aRight) const {
// It's possible that the nsIContent for aItem1 or aItem2 is in a
// subdocument of commonAncestor, because display items for subdocuments
// have been mixed into the same list. Ensure that we're looking at content
// in commonAncestor's document.
Document* commonAncestorDoc = mCommonAncestor->OwnerDoc();
nsIContent* content1 = FindContentInDocument(aLeft, commonAncestorDoc);
nsIContent* content2 = FindContentInDocument(aRight, commonAncestorDoc);
if (!content1 || !content2) {
NS_ERROR("Document trees are mixed up!");
// Something weird going on
return true;
}
return content1 != content2 &&
nsContentUtils::CompareTreePosition<TreeKind::Flat>(
content1, content2, mCommonAncestor) < 0;
}
};
void nsDisplayList::SortByContentOrder(nsIContent* aCommonAncestor) {
Sort<nsDisplayItem*>(ContentComparator(aCommonAncestor));
}
#if !defined(DEBUG) && !defined(MOZ_DIAGNOSTIC_ASSERT_ENABLED)
static_assert(sizeof(nsDisplayItem) <= 176, "nsDisplayItem has grown");
#endif
nsDisplayItem::nsDisplayItem(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame, aBuilder->CurrentActiveScrolledRoot()) {}
nsDisplayItem::nsDisplayItem(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
const ActiveScrolledRoot* aActiveScrolledRoot)
: mFrame(aFrame), mActiveScrolledRoot(aActiveScrolledRoot) {
MOZ_COUNT_CTOR(nsDisplayItem);
MOZ_ASSERT(mFrame);
if (aBuilder->IsRetainingDisplayList()) {
mFrame->AddDisplayItem(this);
}
aBuilder->FindReferenceFrameFor(aFrame, &mToReferenceFrame);
NS_ASSERTION(
aBuilder->GetVisibleRect().width >= 0 || !aBuilder->IsForPainting(),
"visible rect not set");
mClipChain = aBuilder->ClipState().GetCurrentCombinedClipChain(aBuilder);
// The visible rect is for mCurrentFrame, so we have to use
// mCurrentOffsetToReferenceFrame
nsRect visible = aBuilder->GetVisibleRect() +
aBuilder->GetCurrentFrameOffsetToReferenceFrame();
SetBuildingRect(visible);
const nsStyleDisplay* disp = mFrame->StyleDisplay();
if (mFrame->BackfaceIsHidden(disp)) {
mItemFlags += ItemFlag::BackfaceHidden;
}
if (mFrame->Combines3DTransformWithAncestors()) {
mItemFlags += ItemFlag::Combines3DTransformWithAncestors;
}
}
void nsDisplayItem::SetDeletedFrame() { mItemFlags += ItemFlag::DeletedFrame; }
bool nsDisplayItem::HasDeletedFrame() const {
bool retval = mItemFlags.contains(ItemFlag::DeletedFrame) ||
(GetType() == DisplayItemType::TYPE_REMOTE &&
!static_cast<const nsDisplayRemote*>(this)->GetFrameLoader());
MOZ_ASSERT(retval || mFrame);
return retval;
}
/* static */
bool nsDisplayItem::ForceActiveLayers() {
return StaticPrefs::layers_force_active();
}
int32_t nsDisplayItem::ZIndex() const { return mFrame->ZIndex().valueOr(0); }
void nsDisplayItem::SetClipChain(const DisplayItemClipChain* aClipChain,
bool aStore) {
mClipChain = aClipChain;
}
Maybe<nsRect> nsDisplayItem::GetClipWithRespectToASR(
nsDisplayListBuilder* aBuilder, const ActiveScrolledRoot* aASR) const {
if (const DisplayItemClip* clip =
DisplayItemClipChain::ClipForASR(GetClipChain(), aASR)) {
return Some(clip->GetClipRect());
}
#ifdef DEBUG
NS_ASSERTION(false, "item should have finite clip with respect to aASR");
#endif
return Nothing();
}
const DisplayItemClip& nsDisplayItem::GetClip() const {
const DisplayItemClip* clip =
DisplayItemClipChain::ClipForASR(mClipChain, mActiveScrolledRoot);
return clip ? *clip : DisplayItemClip::NoClip();
}
void nsDisplayItem::IntersectClip(nsDisplayListBuilder* aBuilder,
const DisplayItemClipChain* aOther,
bool aStore) {
if (!aOther || mClipChain == aOther) {
return;
}
// aOther might be a reference to a clip on the stack. We need to make sure
// that CreateClipChainIntersection will allocate the actual intersected
// clip in the builder's arena, so for the mClipChain == nullptr case,
// we supply nullptr as the common ancestor so that
// CreateClipChainIntersection clones the whole chain.
const DisplayItemClipChain* ancestorClip =
mClipChain ? FindCommonAncestorClipForIntersection(mClipChain, aOther)
: nullptr;
SetClipChain(
aBuilder->CreateClipChainIntersection(ancestorClip, mClipChain, aOther),
aStore);
}
nsRect nsDisplayItem::GetClippedBounds(nsDisplayListBuilder* aBuilder) const {
bool snap;
nsRect r = GetBounds(aBuilder, &snap);
return GetClip().ApplyNonRoundedIntersection(r);
}
nsDisplayContainer::nsDisplayContainer(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
const ActiveScrolledRoot* aActiveScrolledRoot, nsDisplayList* aList)
: nsDisplayItem(aBuilder, aFrame, aActiveScrolledRoot),
mChildren(aBuilder) {
MOZ_COUNT_CTOR(nsDisplayContainer);
mChildren.AppendToTop(aList);
UpdateBounds(aBuilder);
// Clear and store the clip chain set by nsDisplayItem constructor.
nsDisplayItem::SetClipChain(nullptr, true);
}
nsRect nsDisplayItem::GetPaintRect(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
bool dummy;
nsRect result = GetBounds(aBuilder, &dummy);
if (aCtx) {
result.IntersectRect(result,
nsLayoutUtils::RoundGfxRectToAppRect(
aCtx->GetClipExtents(),
mFrame->PresContext()->AppUnitsPerDevPixel()));
}
return result;
}
bool nsDisplayContainer::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
aManager->CommandBuilder().CreateWebRenderCommandsFromDisplayList(
GetChildren(), this, aDisplayListBuilder, aSc, aBuilder, aResources,
false);
return true;
}
nsRect nsDisplayContainer::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = false;
return mBounds;
}
nsRect nsDisplayContainer::GetComponentAlphaBounds(
nsDisplayListBuilder* aBuilder) const {
return mChildren.GetComponentAlphaBounds(aBuilder);
}
static nsRegion GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList,
const nsRect& aListBounds) {
return aList->GetOpaqueRegion(aBuilder);
}
nsRegion nsDisplayContainer::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
return ::mozilla::GetOpaqueRegion(aBuilder, GetChildren(),
GetBounds(aBuilder, aSnap));
}
Maybe<nsRect> nsDisplayContainer::GetClipWithRespectToASR(
nsDisplayListBuilder* aBuilder, const ActiveScrolledRoot* aASR) const {
// Our children should have finite bounds with respect to |aASR|.
if (aASR == mActiveScrolledRoot) {
return Some(mBounds);
}
return Some(mChildren.GetClippedBoundsWithRespectToASR(aBuilder, aASR));
}
void nsDisplayContainer::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect, HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
mChildren.HitTest(aBuilder, aRect, aState, aOutFrames);
}
void nsDisplayContainer::UpdateBounds(nsDisplayListBuilder* aBuilder) {
// Container item bounds are expected to be clipped.
mBounds =
mChildren.GetClippedBoundsWithRespectToASR(aBuilder, mActiveScrolledRoot);
}
nsRect nsDisplaySolidColor::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = true;
return mBounds;
}
void nsDisplaySolidColor::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
DrawTarget* drawTarget = aCtx->GetDrawTarget();
Rect rect = NSRectToSnappedRect(GetPaintRect(aBuilder, aCtx),
appUnitsPerDevPixel, *drawTarget);
drawTarget->FillRect(rect, ColorPattern(ToDeviceColor(mColor)));
}
void nsDisplaySolidColor::WriteDebugInfo(std::stringstream& aStream) {
aStream << " (rgba " << (int)NS_GET_R(mColor) << "," << (int)NS_GET_G(mColor)
<< "," << (int)NS_GET_B(mColor) << "," << (int)NS_GET_A(mColor)
<< ")";
}
bool nsDisplaySolidColor::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
LayoutDeviceRect bounds = LayoutDeviceRect::FromAppUnits(
mBounds, mFrame->PresContext()->AppUnitsPerDevPixel());
wr::LayoutRect r = wr::ToLayoutRect(bounds);
aBuilder.PushRect(r, r, !BackfaceIsHidden(), false, mIsCheckerboardBackground,
wr::ToColorF(ToDeviceColor(mColor)));
return true;
}
nsRect nsDisplaySolidColorRegion::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = true;
return mRegion.GetBounds();
}
void nsDisplaySolidColorRegion::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
DrawTarget* drawTarget = aCtx->GetDrawTarget();
ColorPattern color(ToDeviceColor(mColor));
for (auto iter = mRegion.RectIter(); !iter.Done(); iter.Next()) {
Rect rect =
NSRectToSnappedRect(iter.Get(), appUnitsPerDevPixel, *drawTarget);
drawTarget->FillRect(rect, color);
}
}
void nsDisplaySolidColorRegion::WriteDebugInfo(std::stringstream& aStream) {
aStream << " (rgba " << int(mColor.r * 255) << "," << int(mColor.g * 255)
<< "," << int(mColor.b * 255) << "," << mColor.a << ")";
}
bool nsDisplaySolidColorRegion::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
for (auto iter = mRegion.RectIter(); !iter.Done(); iter.Next()) {
nsRect rect = iter.Get();
LayoutDeviceRect layerRects = LayoutDeviceRect::FromAppUnits(
rect, mFrame->PresContext()->AppUnitsPerDevPixel());
wr::LayoutRect r = wr::ToLayoutRect(layerRects);
aBuilder.PushRect(r, r, !BackfaceIsHidden(), false, false,
wr::ToColorF(ToDeviceColor(mColor)));
}
return true;
}
static void RegisterThemeGeometry(nsDisplayListBuilder* aBuilder,
nsDisplayItem* aItem, nsIFrame* aFrame,
nsITheme::ThemeGeometryType aType) {
if (aBuilder->IsInChromeDocumentOrPopup()) {
nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(aFrame);
bool preservesAxisAlignedRectangles = false;
nsRect borderBox = nsLayoutUtils::TransformFrameRectToAncestor(
aFrame, aFrame->GetRectRelativeToSelf(), displayRoot,
&preservesAxisAlignedRectangles);
if (preservesAxisAlignedRectangles) {
aBuilder->RegisterThemeGeometry(
aType, aItem,
LayoutDeviceIntRect::FromUnknownRect(borderBox.ToNearestPixels(
aFrame->PresContext()->AppUnitsPerDevPixel())));
}
}
}
// Return the bounds of the viewport relative to |aFrame|'s reference frame.
// Returns Nothing() if transforming into |aFrame|'s coordinate space fails.
static Maybe<nsRect> GetViewportRectRelativeToReferenceFrame(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame) {
nsIFrame* rootFrame = aFrame->PresShell()->GetRootFrame();
nsRect rootRect = rootFrame->GetRectRelativeToSelf();
if (nsLayoutUtils::TransformRect(rootFrame, aFrame, rootRect) ==
nsLayoutUtils::TRANSFORM_SUCCEEDED) {
return Some(rootRect + aBuilder->ToReferenceFrame(aFrame));
}
return Nothing();
}
/* static */ nsDisplayBackgroundImage::InitData
nsDisplayBackgroundImage::GetInitData(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, uint16_t aLayer,
const nsRect& aBackgroundRect,
const ComputedStyle* aBackgroundStyle) {
nsPresContext* presContext = aFrame->PresContext();
uint32_t flags = aBuilder->GetBackgroundPaintFlags();
const nsStyleImageLayers::Layer& layer =
aBackgroundStyle->StyleBackground()->mImage.mLayers[aLayer];
bool isTransformedFixed;
nsBackgroundLayerState state = nsCSSRendering::PrepareImageLayer(
presContext, aFrame, flags, aBackgroundRect, aBackgroundRect, layer,
&isTransformedFixed);
// background-attachment:fixed is treated as background-attachment:scroll
// if it's affected by a transform.
bool shouldTreatAsFixed =
layer.mAttachment == StyleImageLayerAttachment::Fixed &&
!isTransformedFixed;
bool shouldFixToViewport = shouldTreatAsFixed && !layer.mImage.IsNone();
bool isRasterImage = state.mImageRenderer.IsRasterImage();
nsCOMPtr<imgIContainer> image;
if (isRasterImage) {
image = state.mImageRenderer.GetImage();
}
return InitData{aBuilder, aBackgroundStyle, image,
aBackgroundRect, state.mFillArea, state.mDestArea,
aLayer, isRasterImage, shouldFixToViewport};
}
nsDisplayBackgroundImage::nsDisplayBackgroundImage(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, const InitData& aInitData,
nsIFrame* aFrameForBounds)
: nsPaintedDisplayItem(aBuilder, aFrame),
mBackgroundStyle(aInitData.backgroundStyle),
mImage(aInitData.image),
mDependentFrame(nullptr),
mBackgroundRect(aInitData.backgroundRect),
mFillRect(aInitData.fillArea),
mDestRect(aInitData.destArea),
mLayer(aInitData.layer),
mIsRasterImage(aInitData.isRasterImage),
mShouldFixToViewport(aInitData.shouldFixToViewport) {
MOZ_COUNT_CTOR(nsDisplayBackgroundImage);
#ifdef DEBUG
if (mBackgroundStyle && mBackgroundStyle != mFrame->Style()) {
// If this changes, then you also need to adjust css::ImageLoader to
// invalidate mFrame as needed.
MOZ_ASSERT(mFrame->IsCanvasFrame() || mFrame->IsTablePart());
}
#endif
mBounds = GetBoundsInternal(aInitData.builder, aFrameForBounds);
if (mShouldFixToViewport) {
// Expand the item's visible rect to cover the entire bounds, limited to the
// viewport rect. This is necessary because the background's clip can move
// asynchronously.
if (Maybe<nsRect> viewportRect = GetViewportRectRelativeToReferenceFrame(
aInitData.builder, mFrame)) {
SetBuildingRect(mBounds.Intersect(*viewportRect));
}
}
}
nsDisplayBackgroundImage::~nsDisplayBackgroundImage() {
MOZ_COUNT_DTOR(nsDisplayBackgroundImage);
if (mDependentFrame) {
mDependentFrame->RemoveDisplayItem(this);
}
}
static void SetBackgroundClipRegion(
DisplayListClipState::AutoSaveRestore& aClipState, nsIFrame* aFrame,
const nsStyleImageLayers::Layer& aLayer, const nsRect& aBackgroundRect,
bool aWillPaintBorder) {
nsCSSRendering::ImageLayerClipState clip;
nsCSSRendering::GetImageLayerClip(
aLayer, aFrame, *aFrame->StyleBorder(), aBackgroundRect, aBackgroundRect,
aWillPaintBorder, aFrame->PresContext()->AppUnitsPerDevPixel(), &clip);
if (clip.mHasAdditionalBGClipArea) {
aClipState.ClipContentDescendants(
clip.mAdditionalBGClipArea, clip.mBGClipArea,
clip.mHasRoundedCorners ? clip.mRadii : nullptr);
} else {
aClipState.ClipContentDescendants(
clip.mBGClipArea, clip.mHasRoundedCorners ? clip.mRadii : nullptr);
}
}
/**
* This is used for the find bar highlighter overlay. It's only accessible
* through the AnonymousContent API, so it's not exposed to general web pages.
*/
static bool SpecialCutoutRegionCase(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
const nsRect& aBackgroundRect,
nsDisplayList* aList, nscolor aColor) {
nsIContent* content = aFrame->GetContent();
if (!content) {
return false;
}
void* cutoutRegion = content->GetProperty(nsGkAtoms::cutoutregion);
if (!cutoutRegion) {
return false;
}
if (NS_GET_A(aColor) == 0) {
return true;
}
nsRegion region;
region.Sub(aBackgroundRect, *static_cast<nsRegion*>(cutoutRegion));
region.MoveBy(aBuilder->ToReferenceFrame(aFrame));
aList->AppendNewToTop<nsDisplaySolidColorRegion>(aBuilder, aFrame, region,
aColor);
return true;
}
enum class TableType : uint8_t {
Table,
TableCol,
TableColGroup,
TableRow,
TableRowGroup,
TableCell,
MAX,
};
enum class TableTypeBits : uint8_t { Count = 3 };
static_assert(static_cast<uint8_t>(TableType::MAX) <
(1 << (static_cast<uint8_t>(TableTypeBits::Count) + 1)),
"TableType cannot fit with TableTypeBits::Count");
TableType GetTableTypeFromFrame(nsIFrame* aFrame);
static uint16_t CalculateTablePerFrameKey(const uint16_t aIndex,
const TableType aType) {
const uint32_t key = (aIndex << static_cast<uint8_t>(TableTypeBits::Count)) |
static_cast<uint8_t>(aType);
return static_cast<uint16_t>(key);
}
static nsDisplayBackgroundImage* CreateBackgroundImage(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame* aSecondaryFrame,
const nsDisplayBackgroundImage::InitData& aBgData) {
const auto index = aBgData.layer;
if (aSecondaryFrame) {
const auto tableType = GetTableTypeFromFrame(aFrame);
const uint16_t tableItemIndex = CalculateTablePerFrameKey(index, tableType);
return MakeDisplayItemWithIndex<nsDisplayTableBackgroundImage>(
aBuilder, aSecondaryFrame, tableItemIndex, aBgData, aFrame);
}
return MakeDisplayItemWithIndex<nsDisplayBackgroundImage>(aBuilder, aFrame,
index, aBgData);
}
static nsDisplayThemedBackground* CreateThemedBackground(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame* aSecondaryFrame,
const nsRect& aBgRect) {
if (aSecondaryFrame) {
const uint16_t index = static_cast<uint16_t>(GetTableTypeFromFrame(aFrame));
return MakeDisplayItemWithIndex<nsDisplayTableThemedBackground>(
aBuilder, aSecondaryFrame, index, aBgRect, aFrame);
}
return MakeDisplayItem<nsDisplayThemedBackground>(aBuilder, aFrame, aBgRect);
}
static nsDisplayBackgroundColor* CreateBackgroundColor(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame* aSecondaryFrame,
nsRect& aBgRect, const ComputedStyle* aBgSC, nscolor aColor) {
if (aSecondaryFrame) {
const uint16_t index = static_cast<uint16_t>(GetTableTypeFromFrame(aFrame));
return MakeDisplayItemWithIndex<nsDisplayTableBackgroundColor>(
aBuilder, aSecondaryFrame, index, aBgRect, aBgSC, aColor, aFrame);
}
return MakeDisplayItem<nsDisplayBackgroundColor>(aBuilder, aFrame, aBgRect,
aBgSC, aColor);
}
static void DealWithWindowsAppearanceHacks(nsIFrame* aFrame,
nsDisplayListBuilder* aBuilder) {
const auto& disp = *aFrame->StyleDisplay();
// We use default appearance rather than effective appearance because we want
// to handle when titlebar buttons that have appearance: none.
const auto defaultAppearance = disp.mDefaultAppearance;
if (MOZ_LIKELY(defaultAppearance == StyleAppearance::None)) {
return;
}
if (auto type = disp.GetWindowButtonType()) {
if (auto* widget = aFrame->GetNearestWidget()) {
auto rect = LayoutDevicePixel::FromAppUnitsToNearest(
nsRect(aBuilder->ToReferenceFrame(aFrame), aFrame->GetSize()),
aFrame->PresContext()->AppUnitsPerDevPixel());
widget->SetWindowButtonRect(*type, rect);
}
}
}
/*static*/
AppendedBackgroundType nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
const nsRect& aBackgroundRect, nsDisplayList* aList,
bool aAllowWillPaintBorderOptimization, const nsRect& aBackgroundOriginRect,
nsIFrame* aSecondaryReferenceFrame,
Maybe<nsDisplayListBuilder::AutoBuildingDisplayList>*
aAutoBuildingDisplayList) {
MOZ_ASSERT(!aFrame->IsCanvasFrame(),
"We don't expect propagated canvas backgrounds here");
#ifdef DEBUG
{
nsIFrame* bgFrame = nsCSSRendering::FindBackgroundFrame(aFrame);
MOZ_ASSERT(
!bgFrame || bgFrame == aFrame,
"Should only suppress backgrounds, never propagate to another frame");
}
#endif
DealWithWindowsAppearanceHacks(aFrame, aBuilder);
const bool isThemed = aFrame->IsThemed();
const ComputedStyle* bgSC = aFrame->Style();
const nsStyleBackground* bg = bgSC->StyleBackground();
const bool needsBackgroundColor =
aBuilder->IsForEventDelivery() ||
(EffectCompositor::HasAnimationsForCompositor(
aFrame, DisplayItemType::TYPE_BACKGROUND_COLOR) &&
!isThemed);
if (!needsBackgroundColor && !isThemed && bg->IsTransparent(bgSC)) {
return AppendedBackgroundType::None;
}
bool drawBackgroundColor = false;
bool drawBackgroundImage = false;
nscolor color = NS_RGBA(0, 0, 0, 0);
// Don't get background color / images if we propagated our background to the
// canvas (that is, if FindBackgroundFrame is null). But don't early return
// yet, since we might still need a background-color item for hit-testing.
if (!isThemed && nsCSSRendering::FindBackgroundFrame(aFrame)) {
color = nsCSSRendering::DetermineBackgroundColor(
aFrame->PresContext(), bgSC, aFrame, drawBackgroundImage,
drawBackgroundColor);
}
if (SpecialCutoutRegionCase(aBuilder, aFrame, aBackgroundRect, aList,
color)) {
return AppendedBackgroundType::None;
}
const nsStyleBorder& border = *aFrame->StyleBorder();
const bool willPaintBorder =
aAllowWillPaintBorderOptimization && !isThemed &&
!aFrame->StyleEffects()->HasBoxShadowWithInset(true) &&
border.HasBorder();
auto EnsureBuildingDisplayList = [&] {
if (!aAutoBuildingDisplayList || *aAutoBuildingDisplayList) {
return;
}
nsPoint offset = aBuilder->GetCurrentFrame()->GetOffsetTo(aFrame);
aAutoBuildingDisplayList->emplace(aBuilder, aFrame,
aBuilder->GetVisibleRect() + offset,
aBuilder->GetDirtyRect() + offset);
};
// An auxiliary list is necessary in case we have background blending; if that
// is the case, background items need to be wrapped by a blend container to
// isolate blending to the background
nsDisplayList bgItemList(aBuilder);
// Even if we don't actually have a background color to paint, we may still
// need to create an item for hit testing and we still need to create an item
// for background-color animations.
if ((drawBackgroundColor && color != NS_RGBA(0, 0, 0, 0)) ||
needsBackgroundColor) {
EnsureBuildingDisplayList();
Maybe<DisplayListClipState::AutoSaveRestore> clipState;
nsRect bgColorRect = aBackgroundRect;
if (!isThemed && !aBuilder->IsForEventDelivery()) {
// Disable the will-paint-border optimization for background
// colors with no border-radius. Enabling it for background colors
// doesn't help much (there are no tiling issues) and clipping the
// background breaks detection of the element's border-box being
// opaque. For nonzero border-radius we still need it because we
// want to inset the background if possible to avoid antialiasing
// artifacts along the rounded corners.
const bool useWillPaintBorderOptimization =
willPaintBorder &&
nsLayoutUtils::HasNonZeroCorner(border.mBorderRadius);
nsCSSRendering::ImageLayerClipState clip;
nsCSSRendering::GetImageLayerClip(
bg->BottomLayer(), aFrame, border, aBackgroundRect, aBackgroundRect,
useWillPaintBorderOptimization,
aFrame->PresContext()->AppUnitsPerDevPixel(), &clip);
bgColorRect = bgColorRect.Intersect(clip.mBGClipArea);
if (clip.mHasAdditionalBGClipArea) {
bgColorRect = bgColorRect.Intersect(clip.mAdditionalBGClipArea);
}
if (clip.mHasRoundedCorners) {
clipState.emplace(aBuilder);
clipState->ClipContentDescendants(clip.mBGClipArea, clip.mRadii);
}
}
nsDisplayBackgroundColor* bgItem = CreateBackgroundColor(
aBuilder, aFrame, aSecondaryReferenceFrame, bgColorRect, bgSC,
drawBackgroundColor ? color : NS_RGBA(0, 0, 0, 0));
if (bgItem) {
bgItemList.AppendToTop(bgItem);
}
}
if (isThemed) {
nsDisplayThemedBackground* bgItem = CreateThemedBackground(
aBuilder, aFrame, aSecondaryReferenceFrame, aBackgroundRect);
if (bgItem) {
bgItem->Init(aBuilder);
bgItemList.AppendToTop(bgItem);
}
if (!bgItemList.IsEmpty()) {
aList->AppendToTop(&bgItemList);
return AppendedBackgroundType::ThemedBackground;
}
return AppendedBackgroundType::None;
}
if (!drawBackgroundImage) {
if (!bgItemList.IsEmpty()) {
aList->AppendToTop(&bgItemList);
return AppendedBackgroundType::Background;
}
return AppendedBackgroundType::None;
}
const ActiveScrolledRoot* asr = aBuilder->CurrentActiveScrolledRoot();
bool needBlendContainer = false;
const nsRect& bgOriginRect =
aBackgroundOriginRect.IsEmpty() ? aBackgroundRect : aBackgroundOriginRect;
// Passing bg == nullptr in this macro will result in one iteration with
// i = 0.
NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT(i, bg->mImage) {
if (bg->mImage.mLayers[i].mImage.IsNone()) {
continue;
}
EnsureBuildingDisplayList();
if (bg->mImage.mLayers[i].mBlendMode != StyleBlend::Normal) {
needBlendContainer = true;
}
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
if (!aBuilder->IsForEventDelivery()) {
const nsStyleImageLayers::Layer& layer = bg->mImage.mLayers[i];
SetBackgroundClipRegion(clipState, aFrame, layer, aBackgroundRect,
willPaintBorder);
}
nsDisplayList thisItemList(aBuilder);
nsDisplayBackgroundImage::InitData bgData =
nsDisplayBackgroundImage::GetInitData(aBuilder, aFrame, i, bgOriginRect,
bgSC);
if (bgData.shouldFixToViewport) {
auto* displayData = aBuilder->GetCurrentFixedBackgroundDisplayData();
nsDisplayListBuilder::AutoBuildingDisplayList buildingDisplayList(
aBuilder, aFrame, aBuilder->GetVisibleRect(),
aBuilder->GetDirtyRect());
nsDisplayListBuilder::AutoCurrentActiveScrolledRootSetter asrSetter(
aBuilder);
if (displayData) {
asrSetter.SetCurrentActiveScrolledRoot(
displayData->mContainingBlockActiveScrolledRoot);
asrSetter.SetCurrentScrollParentId(displayData->mScrollParentId);
if (nsLayoutUtils::UsesAsyncScrolling(aFrame)) {
// Override the dirty rect on the builder to be the dirty rect of
// the viewport.
// displayData->mDirtyRect is relative to the presshell's viewport
// frame (the root frame), and we need it to be relative to aFrame.
nsIFrame* rootFrame =
aBuilder->CurrentPresShellState()->mPresShell->GetRootFrame();
// There cannot be any transforms between aFrame and rootFrame
// because then bgData.shouldFixToViewport would have been false.
nsRect visibleRect =
displayData->mVisibleRect + aFrame->GetOffsetTo(rootFrame);
aBuilder->SetVisibleRect(visibleRect);
nsRect dirtyRect =
displayData->mDirtyRect + aFrame->GetOffsetTo(rootFrame);
aBuilder->SetDirtyRect(dirtyRect);
}
}
nsDisplayBackgroundImage* bgItem = nullptr;
{
// The clip is captured by the nsDisplayFixedPosition, so clear the
// clip for the nsDisplayBackgroundImage inside.
DisplayListClipState::AutoSaveRestore bgImageClip(aBuilder);
bgImageClip.Clear();
bgItem = CreateBackgroundImage(aBuilder, aFrame,
aSecondaryReferenceFrame, bgData);
}
if (bgItem) {
thisItemList.AppendToTop(
nsDisplayFixedPosition::CreateForFixedBackground(
aBuilder, aFrame, aSecondaryReferenceFrame, bgItem, i, asr));
}
} else { // bgData.shouldFixToViewport == false
nsDisplayBackgroundImage* bgItem = CreateBackgroundImage(
aBuilder, aFrame, aSecondaryReferenceFrame, bgData);
if (bgItem) {
thisItemList.AppendToTop(bgItem);
}
}
if (bg->mImage.mLayers[i].mBlendMode != StyleBlend::Normal) {
// asr is scrolled. Even if we wrap a fixed background layer, that's
// fine, because the item will have a scrolled clip that limits the
// item with respect to asr.
if (aSecondaryReferenceFrame) {
const auto tableType = GetTableTypeFromFrame(aFrame);
const uint16_t index = CalculateTablePerFrameKey(i + 1, tableType);
thisItemList.AppendNewToTopWithIndex<nsDisplayTableBlendMode>(
aBuilder, aSecondaryReferenceFrame, index, &thisItemList,
bg->mImage.mLayers[i].mBlendMode, asr, aFrame, true);
} else {
thisItemList.AppendNewToTopWithIndex<nsDisplayBlendMode>(
aBuilder, aFrame, i + 1, &thisItemList,
bg->mImage.mLayers[i].mBlendMode, asr, true);
}
}
bgItemList.AppendToTop(&thisItemList);
}
if (needBlendContainer) {
bgItemList.AppendToTop(
nsDisplayBlendContainer::CreateForBackgroundBlendMode(
aBuilder, aFrame, aSecondaryReferenceFrame, &bgItemList, asr));
}
if (!bgItemList.IsEmpty()) {
aList->AppendToTop(&bgItemList);
return AppendedBackgroundType::Background;
}
return AppendedBackgroundType::None;
}
// Check that the rounded border of aFrame, added to aToReferenceFrame,
// intersects aRect. Assumes that the unrounded border has already
// been checked for intersection.
static bool RoundedBorderIntersectsRect(nsIFrame* aFrame,
const nsPoint& aFrameToReferenceFrame,
const nsRect& aTestRect) {
if (!nsRect(aFrameToReferenceFrame, aFrame->GetSize())
.Intersects(aTestRect)) {
return false;
}
nscoord radii[8];
return !aFrame->GetBorderRadii(radii) ||
nsLayoutUtils::RoundedRectIntersectsRect(
nsRect(aFrameToReferenceFrame, aFrame->GetSize()), radii,
aTestRect);
}
// Returns TRUE if aContainedRect is guaranteed to be contained in
// the rounded rect defined by aRoundedRect and aRadii. Complex cases are
// handled conservatively by returning FALSE in some situations where
// a more thorough analysis could return TRUE.
//
// See also RoundedRectIntersectsRect.
static bool RoundedRectContainsRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aContainedRect) {
nsRegion rgn = nsLayoutUtils::RoundedRectIntersectRect(aRoundedRect, aRadii,
aContainedRect);
return rgn.Contains(aContainedRect);
}
bool nsDisplayBackgroundImage::CanApplyOpacity(
WebRenderLayerManager* aManager, nsDisplayListBuilder* aBuilder) const {
return CanBuildWebRenderDisplayItems(aManager, aBuilder);
}
bool nsDisplayBackgroundImage::CanBuildWebRenderDisplayItems(
WebRenderLayerManager* aManager, nsDisplayListBuilder* aBuilder) const {
return mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer].mClip !=
StyleGeometryBox::Text &&
nsCSSRendering::CanBuildWebRenderDisplayItemsForStyleImageLayer(
aManager, *StyleFrame()->PresContext(), StyleFrame(),
mBackgroundStyle->StyleBackground(), mLayer,
aBuilder->GetBackgroundPaintFlags());
}
bool nsDisplayBackgroundImage::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
if (!CanBuildWebRenderDisplayItems(aManager->LayerManager(),
aDisplayListBuilder)) {
return false;
}
uint32_t paintFlags = aDisplayListBuilder->GetBackgroundPaintFlags();
bool dummy;
nsCSSRendering::PaintBGParams params =
nsCSSRendering::PaintBGParams::ForSingleLayer(
*StyleFrame()->PresContext(), GetBounds(aDisplayListBuilder, &dummy),
mBackgroundRect, StyleFrame(), paintFlags, mLayer,
CompositionOp::OP_OVER, aBuilder.GetInheritedOpacity());
params.bgClipRect = &mBounds;
ImgDrawResult result =
nsCSSRendering::BuildWebRenderDisplayItemsForStyleImageLayer(
params, aBuilder, aResources, aSc, aManager, this);
if (result == ImgDrawResult::NOT_SUPPORTED) {
return false;
}
if (nsIContent* content = StyleFrame()->GetContent()) {
if (imgRequestProxy* requestProxy = mBackgroundStyle->StyleBackground()
->mImage.mLayers[mLayer]
.mImage.GetImageRequest()) {
// LCP don't consider gradient backgrounds.
LCPHelpers::FinalizeLCPEntryForImage(content->AsElement(), requestProxy,
mBounds - ToReferenceFrame());
}
}
return true;
}
void nsDisplayBackgroundImage::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
if (RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
aOutFrames->AppendElement(mFrame);
}
}
static nsRect GetInsideClipRect(const nsDisplayItem* aItem,
StyleGeometryBox aClip, const nsRect& aRect,
const nsRect& aBackgroundRect) {
if (aRect.IsEmpty()) {
return {};
}
nsIFrame* frame = aItem->Frame();
nsRect clipRect = aBackgroundRect;
if (frame->IsCanvasFrame()) {
nsCanvasFrame* canvasFrame = static_cast<nsCanvasFrame*>(frame);
clipRect = canvasFrame->CanvasArea() + aItem->ToReferenceFrame();
} else if (aClip == StyleGeometryBox::PaddingBox ||
aClip == StyleGeometryBox::ContentBox) {
nsMargin border = frame->GetUsedBorder();
if (aClip == StyleGeometryBox::ContentBox) {
border += frame->GetUsedPadding();
}
border.ApplySkipSides(frame->GetSkipSides());
clipRect.Deflate(border);
}
return clipRect.Intersect(aRect);
}
nsRegion nsDisplayBackgroundImage::GetOpaqueRegion(
nsDisplayListBuilder* aBuilder, bool* aSnap) const {
nsRegion result;
*aSnap = false;
if (!mBackgroundStyle) {
return result;
}
*aSnap = true;
// For StyleBoxDecorationBreak::Slice, don't try to optimize here, since
// this could easily lead to O(N^2) behavior inside InlineBackgroundData,
// which expects frames to be sent to it in content order, not reverse
// content order which we'll produce here.
// Of course, if there's only one frame in the flow, it doesn't matter.
if (mFrame->StyleBorder()->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Clone ||
(!mFrame->GetPrevContinuation() && !mFrame->GetNextContinuation())) {
const nsStyleImageLayers::Layer& layer =
mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer];
if (layer.mImage.IsOpaque() && layer.mBlendMode == StyleBlend::Normal &&
layer.mRepeat.mXRepeat != StyleImageLayerRepeat::Space &&
layer.mRepeat.mYRepeat != StyleImageLayerRepeat::Space &&
layer.mClip != StyleGeometryBox::Text) {
result = GetInsideClipRect(this, layer.mClip, mBounds, mBackgroundRect);
}
}
return result;
}
Maybe<nscolor> nsDisplayBackgroundImage::IsUniform(
nsDisplayListBuilder* aBuilder) const {
if (!mBackgroundStyle) {
return Some(NS_RGBA(0, 0, 0, 0));
}
return Nothing();
}
nsRect nsDisplayBackgroundImage::GetPositioningArea() const {
if (!mBackgroundStyle) {
return nsRect();
}
nsIFrame* attachedToFrame;
bool transformedFixed;
return nsCSSRendering::ComputeImageLayerPositioningArea(
mFrame->PresContext(), mFrame, mBackgroundRect,
mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer],
&attachedToFrame, &transformedFixed) +
ToReferenceFrame();
}
bool nsDisplayBackgroundImage::RenderingMightDependOnPositioningAreaSizeChange()
const {
if (!mBackgroundStyle) {
return false;
}
nscoord radii[8];
if (mFrame->GetBorderRadii(radii)) {
// A change in the size of the positioning area might change the position
// of the rounded corners.
return true;
}
const nsStyleImageLayers::Layer& layer =
mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer];
return layer.RenderingMightDependOnPositioningAreaSizeChange();
}
void nsDisplayBackgroundImage::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
PaintInternal(aBuilder, aCtx, GetPaintRect(aBuilder, aCtx), &mBounds);
}
void nsDisplayBackgroundImage::PaintInternal(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx,
const nsRect& aBounds,
nsRect* aClipRect) {
gfxContext* ctx = aCtx;
StyleGeometryBox clip =
mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer].mClip;
if (clip == StyleGeometryBox::Text) {
if (!GenerateAndPushTextMask(StyleFrame(), aCtx, mBackgroundRect,
aBuilder)) {
return;
}
}
nsCSSRendering::PaintBGParams params =
nsCSSRendering::PaintBGParams::ForSingleLayer(
*StyleFrame()->PresContext(), aBounds, mBackgroundRect, StyleFrame(),
aBuilder->GetBackgroundPaintFlags(), mLayer, CompositionOp::OP_OVER,
1.0f);
params.bgClipRect = aClipRect;
Unused << nsCSSRendering::PaintStyleImageLayer(params, *aCtx);
if (clip == StyleGeometryBox::Text) {
ctx->PopGroupAndBlend();
}
}
void nsDisplayBackgroundImage::ComputeInvalidationRegion(
nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const {
if (!mBackgroundStyle) {
return;
}
const auto* geometry =
static_cast<const nsDisplayBackgroundGeometry*>(aGeometry);
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
nsRect positioningArea = GetPositioningArea();
if (positioningArea.TopLeft() != geometry->mPositioningArea.TopLeft() ||
(positioningArea.Size() != geometry->mPositioningArea.Size() &&
RenderingMightDependOnPositioningAreaSizeChange())) {
// Positioning area changed in a way that could cause everything to change,
// so invalidate everything (both old and new painting areas).
aInvalidRegion->Or(bounds, geometry->mBounds);
return;
}
if (!mDestRect.IsEqualInterior(geometry->mDestRect)) {
// Dest area changed in a way that could cause everything to change,
// so invalidate everything (both old and new painting areas).
aInvalidRegion->Or(bounds, geometry->mBounds);
return;
}
if (!bounds.IsEqualInterior(geometry->mBounds)) {
// Positioning area is unchanged, so invalidate just the change in the
// painting area.
aInvalidRegion->Xor(bounds, geometry->mBounds);
}
}
nsRect nsDisplayBackgroundImage::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = true;
return mBounds;
}
nsRect nsDisplayBackgroundImage::GetBoundsInternal(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrameForBounds) {
// This allows nsDisplayTableBackgroundImage to change the frame used for
// bounds calculation.
nsIFrame* frame = aFrameForBounds ? aFrameForBounds : mFrame;
nsPresContext* presContext = frame->PresContext();
if (!mBackgroundStyle) {
return nsRect();
}
nsRect clipRect = mBackgroundRect;
if (frame->IsCanvasFrame()) {
nsCanvasFrame* canvasFrame = static_cast<nsCanvasFrame*>(frame);
clipRect = canvasFrame->CanvasArea() + ToReferenceFrame();
}
const nsStyleImageLayers::Layer& layer =
mBackgroundStyle->StyleBackground()->mImage.mLayers[mLayer];
return nsCSSRendering::GetBackgroundLayerRect(
presContext, frame, mBackgroundRect, clipRect, layer,
aBuilder->GetBackgroundPaintFlags());
}
nsDisplayTableBackgroundImage::nsDisplayTableBackgroundImage(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, const InitData& aData,
nsIFrame* aCellFrame)
: nsDisplayBackgroundImage(aBuilder, aFrame, aData, aCellFrame),
mStyleFrame(aCellFrame) {
if (aBuilder->IsRetainingDisplayList()) {
mStyleFrame->AddDisplayItem(this);
}
}
nsDisplayTableBackgroundImage::~nsDisplayTableBackgroundImage() {
if (mStyleFrame) {
mStyleFrame->RemoveDisplayItem(this);
}
}
bool nsDisplayTableBackgroundImage::IsInvalid(nsRect& aRect) const {
bool result = mStyleFrame ? mStyleFrame->IsInvalid(aRect) : false;
aRect += ToReferenceFrame();
return result;
}
nsDisplayThemedBackground::nsDisplayThemedBackground(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
const nsRect& aBackgroundRect)
: nsPaintedDisplayItem(aBuilder, aFrame), mBackgroundRect(aBackgroundRect) {
MOZ_COUNT_CTOR(nsDisplayThemedBackground);
}
void nsDisplayThemedBackground::Init(nsDisplayListBuilder* aBuilder) {
const nsStyleDisplay* disp = StyleFrame()->StyleDisplay();
mAppearance = disp->EffectiveAppearance();
StyleFrame()->IsThemed(disp, &mThemeTransparency);
// Perform necessary RegisterThemeGeometry
nsITheme* theme = StyleFrame()->PresContext()->Theme();
nsITheme::ThemeGeometryType type =
theme->ThemeGeometryTypeForWidget(StyleFrame(), mAppearance);
if (type != nsITheme::eThemeGeometryTypeUnknown) {
RegisterThemeGeometry(aBuilder, this, StyleFrame(), type);
}
mBounds = GetBoundsInternal();
}
void nsDisplayThemedBackground::WriteDebugInfo(std::stringstream& aStream) {
aStream << " (themed, appearance:" << (int)mAppearance << ")";
}
void nsDisplayThemedBackground::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
// Assume that any point in our background rect is a hit.
if (mBackgroundRect.Intersects(aRect)) {
aOutFrames->AppendElement(mFrame);
}
}
nsRegion nsDisplayThemedBackground::GetOpaqueRegion(
nsDisplayListBuilder* aBuilder, bool* aSnap) const {
nsRegion result;
*aSnap = false;
if (mThemeTransparency == nsITheme::eOpaque) {
*aSnap = true;
result = mBackgroundRect;
}
return result;
}
Maybe<nscolor> nsDisplayThemedBackground::IsUniform(
nsDisplayListBuilder* aBuilder) const {
return Nothing();
}
nsRect nsDisplayThemedBackground::GetPositioningArea() const {
return mBackgroundRect;
}
void nsDisplayThemedBackground::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
PaintInternal(aBuilder, aCtx, GetPaintRect(aBuilder, aCtx), nullptr);
}
void nsDisplayThemedBackground::PaintInternal(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx,
const nsRect& aBounds,
nsRect* aClipRect) {
// XXXzw this ignores aClipRect.
nsPresContext* presContext = StyleFrame()->PresContext();
nsITheme* theme = presContext->Theme();
nsRect drawing(mBackgroundRect);
theme->GetWidgetOverflow(presContext->DeviceContext(), StyleFrame(),
mAppearance, &drawing);
drawing.IntersectRect(drawing, aBounds);
theme->DrawWidgetBackground(aCtx, StyleFrame(), mAppearance, mBackgroundRect,
drawing);
}
bool nsDisplayThemedBackground::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
nsITheme* theme = StyleFrame()->PresContext()->Theme();
return theme->CreateWebRenderCommandsForWidget(aBuilder, aResources, aSc,
aManager, StyleFrame(),
mAppearance, mBackgroundRect);
}
bool nsDisplayThemedBackground::IsWindowActive() const {
return !mFrame->PresContext()->Document()->IsTopLevelWindowInactive();
}
void nsDisplayThemedBackground::ComputeInvalidationRegion(
nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const {
const auto* geometry =
static_cast<const nsDisplayThemedBackgroundGeometry*>(aGeometry);
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
nsRect positioningArea = GetPositioningArea();
if (!positioningArea.IsEqualInterior(geometry->mPositioningArea)) {
// Invalidate everything (both old and new painting areas).
aInvalidRegion->Or(bounds, geometry->mBounds);
return;
}
if (!bounds.IsEqualInterior(geometry->mBounds)) {
// Positioning area is unchanged, so invalidate just the change in the
// painting area.
aInvalidRegion->Xor(bounds, geometry->mBounds);
}
nsITheme* theme = StyleFrame()->PresContext()->Theme();
if (theme->WidgetAppearanceDependsOnWindowFocus(mAppearance) &&
IsWindowActive() != geometry->mWindowIsActive) {
aInvalidRegion->Or(*aInvalidRegion, bounds);
}
}
nsRect nsDisplayThemedBackground::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = true;
return mBounds;
}
nsRect nsDisplayThemedBackground::GetBoundsInternal() {
nsPresContext* presContext = mFrame->PresContext();
nsRect r = mBackgroundRect - ToReferenceFrame();
presContext->Theme()->GetWidgetOverflow(
presContext->DeviceContext(), mFrame,
mFrame->StyleDisplay()->EffectiveAppearance(), &r);
return r + ToReferenceFrame();
}
#if defined(MOZ_REFLOW_PERF_DSP) && defined(MOZ_REFLOW_PERF)
void nsDisplayReflowCount::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
mFrame->PresShell()->PaintCount(mFrameName, aCtx, mFrame->PresContext(),
mFrame, ToReferenceFrame(), mColor);
}
#endif
bool nsDisplayBackgroundColor::CanApplyOpacity(
WebRenderLayerManager* aManager, nsDisplayListBuilder* aBuilder) const {
// Don't apply opacity if the background color is animated since the color is
// going to be changed on the compositor.
return !EffectCompositor::HasAnimationsForCompositor(
mFrame, DisplayItemType::TYPE_BACKGROUND_COLOR);
}
bool nsDisplayBackgroundColor::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
gfx::sRGBColor color = mColor;
color.a *= aBuilder.GetInheritedOpacity();
if (color == sRGBColor() &&
!EffectCompositor::HasAnimationsForCompositor(
mFrame, DisplayItemType::TYPE_BACKGROUND_COLOR)) {
return true;
}
if (HasBackgroundClipText()) {
return false;
}
uint64_t animationsId = 0;
// We don't support background-color animations on table elements yet.
if (GetType() == DisplayItemType::TYPE_BACKGROUND_COLOR) {
animationsId =
AddAnimationsForWebRender(this, aManager, aDisplayListBuilder);
}
LayoutDeviceRect bounds = LayoutDeviceRect::FromAppUnits(
mBackgroundRect, mFrame->PresContext()->AppUnitsPerDevPixel());
wr::LayoutRect r = wr::ToLayoutRect(bounds);
if (animationsId) {
wr::WrAnimationProperty prop{
wr::WrAnimationType::BackgroundColor,
animationsId,
};
aBuilder.PushRectWithAnimation(r, r, !BackfaceIsHidden(),
wr::ToColorF(ToDeviceColor(color)), &prop);
} else {
aBuilder.StartGroup(this);
aBuilder.PushRect(r, r, !BackfaceIsHidden(), false, false,
wr::ToColorF(ToDeviceColor(color)));
aBuilder.FinishGroup();
}
return true;
}
void nsDisplayBackgroundColor::PaintWithClip(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx,
const DisplayItemClip& aClip) {
MOZ_ASSERT(!HasBackgroundClipText());
if (mColor == sRGBColor()) {
return;
}
nsRect fillRect = mBackgroundRect;
if (aClip.HasClip()) {
fillRect.IntersectRect(fillRect, aClip.GetClipRect());
}
DrawTarget* dt = aCtx->GetDrawTarget();
int32_t A2D = mFrame->PresContext()->AppUnitsPerDevPixel();
Rect bounds = ToRect(nsLayoutUtils::RectToGfxRect(fillRect, A2D));
MaybeSnapToDevicePixels(bounds, *dt);
ColorPattern fill(ToDeviceColor(mColor));
if (aClip.GetRoundedRectCount()) {
MOZ_ASSERT(aClip.GetRoundedRectCount() == 1);
AutoTArray<DisplayItemClip::RoundedRect, 1> roundedRect;
aClip.AppendRoundedRects(&roundedRect);
bool pushedClip = false;
if (!fillRect.Contains(roundedRect[0].mRect)) {
dt->PushClipRect(bounds);
pushedClip = true;
}
RectCornerRadii pixelRadii;
nsCSSRendering::ComputePixelRadii(roundedRect[0].mRadii, A2D, &pixelRadii);
dt->FillRoundedRect(
RoundedRect(NSRectToSnappedRect(roundedRect[0].mRect, A2D, *dt),
pixelRadii),
fill);
if (pushedClip) {
dt->PopClip();
}
} else {
dt->FillRect(bounds, fill);
}
}
void nsDisplayBackgroundColor::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
if (mColor == sRGBColor()) {
return;
}
#if 0
// results in a precision induced rounding issue that makes the rect one
// pixel shorter in rare cases. Disabled in favor of the old code for now.
// Note that the pref layout.css.devPixelsPerPx needs to be set to 1 to
// reproduce the bug.
//
// TODO:
// This new path does not include support for background-clip:text; need to
// be fixed if/when we switch to this new code path.
DrawTarget& aDrawTarget = *aCtx->GetDrawTarget();
Rect rect = NSRectToSnappedRect(mBackgroundRect,
mFrame->PresContext()->AppUnitsPerDevPixel(),
aDrawTarget);
ColorPattern color(ToDeviceColor(mColor));
aDrawTarget.FillRect(rect, color);
#else
gfxContext* ctx = aCtx;
gfxRect bounds = nsLayoutUtils::RectToGfxRect(
mBackgroundRect, mFrame->PresContext()->AppUnitsPerDevPixel());
if (HasBackgroundClipText()) {
if (!GenerateAndPushTextMask(mFrame, aCtx, mBackgroundRect, aBuilder)) {
return;
}
ctx->SetColor(mColor);
ctx->NewPath();
ctx->SnappedRectangle(bounds);
ctx->Fill();
ctx->PopGroupAndBlend();
return;
}
ctx->SetColor(mColor);
ctx->NewPath();
ctx->SnappedRectangle(bounds);
ctx->Fill();
#endif
}
nsRegion nsDisplayBackgroundColor::GetOpaqueRegion(
nsDisplayListBuilder* aBuilder, bool* aSnap) const {
*aSnap = false;
if (mColor.a != 1 ||
// Even if the current alpha channel is 1, we treat this item as if it's
// non-opaque if there is a background-color animation since the animation
// might change the alpha channel.
EffectCompositor::HasAnimationsForCompositor(
mFrame, DisplayItemType::TYPE_BACKGROUND_COLOR)) {
return nsRegion();
}
if (!mHasStyle || HasBackgroundClipText()) {
return nsRegion();
}
*aSnap = true;
return GetInsideClipRect(this, mBottomLayerClip, mBackgroundRect,
mBackgroundRect);
}
Maybe<nscolor> nsDisplayBackgroundColor::IsUniform(
nsDisplayListBuilder* aBuilder) const {
return Some(mColor.ToABGR());
}
void nsDisplayBackgroundColor::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
// aRect doesn't intersect our border-radius curve.
return;
}
aOutFrames->AppendElement(mFrame);
}
void nsDisplayBackgroundColor::WriteDebugInfo(std::stringstream& aStream) {
aStream << " (rgba " << mColor.r << "," << mColor.g << "," << mColor.b << ","
<< mColor.a << ")";
aStream << " backgroundRect" << mBackgroundRect;
}
nsRect nsDisplayOutline::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = false;
return mFrame->InkOverflowRectRelativeToSelf() + ToReferenceFrame();
}
nsRect nsDisplayOutline::GetInnerRect() const {
if (nsRect* savedOutlineInnerRect =
mFrame->GetProperty(nsIFrame::OutlineInnerRectProperty())) {
return *savedOutlineInnerRect;
}
return mFrame->GetRectRelativeToSelf();
}
void nsDisplayOutline::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
// TODO join outlines together
MOZ_ASSERT(mFrame->StyleOutline()->ShouldPaintOutline(),
"Should have not created a nsDisplayOutline!");
nsRect rect = GetInnerRect() + ToReferenceFrame();
nsPresContext* pc = mFrame->PresContext();
if (IsThemedOutline()) {
rect.Inflate(mFrame->StyleOutline()->EffectiveOffsetFor(rect));
pc->Theme()->DrawWidgetBackground(aCtx, mFrame,
StyleAppearance::FocusOutline, rect,
GetPaintRect(aBuilder, aCtx));
return;
}
nsCSSRendering::PaintNonThemedOutline(
pc, *aCtx, mFrame, GetPaintRect(aBuilder, aCtx), rect, mFrame->Style());
}
bool nsDisplayOutline::IsThemedOutline() const {
#ifdef DEBUG
nsPresContext* pc = mFrame->PresContext();
MOZ_ASSERT(
pc->Theme()->ThemeSupportsWidget(pc, mFrame,
StyleAppearance::FocusOutline),
"All of our supported platforms have support for themed focus-outlines");
#endif
return mFrame->StyleOutline()->mOutlineStyle.IsAuto();
}
bool nsDisplayOutline::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
nsPresContext* pc = mFrame->PresContext();
nsRect rect = GetInnerRect() + ToReferenceFrame();
if (IsThemedOutline()) {
rect.Inflate(mFrame->StyleOutline()->EffectiveOffsetFor(rect));
return pc->Theme()->CreateWebRenderCommandsForWidget(
aBuilder, aResources, aSc, aManager, mFrame,
StyleAppearance::FocusOutline, rect);
}
bool dummy;
Maybe<nsCSSBorderRenderer> borderRenderer =
nsCSSRendering::CreateBorderRendererForNonThemedOutline(
pc, /* aDrawTarget = */ nullptr, mFrame,
GetBounds(aDisplayListBuilder, &dummy), rect, mFrame->Style());
if (!borderRenderer) {
// No border renderer means "there is no outline".
// Paint nothing and return success.
return true;
}
borderRenderer->CreateWebRenderCommands(this, aBuilder, aResources, aSc);
return true;
}
bool nsDisplayOutline::HasRadius() const {
const auto& radius = mFrame->StyleBorder()->mBorderRadius;
return !nsLayoutUtils::HasNonZeroCorner(radius);
}
bool nsDisplayOutline::IsInvisibleInRect(const nsRect& aRect) const {
const nsStyleOutline* outline = mFrame->StyleOutline();
nsRect borderBox(ToReferenceFrame(), mFrame->GetSize());
if (borderBox.Contains(aRect) && !HasRadius() &&
outline->mOutlineOffset.ToCSSPixels() >= 0.0f) {
// aRect is entirely inside the border-rect, and the outline isn't rendered
// inside the border-rect, so the outline is not visible.
return true;
}
return false;
}
void nsDisplayEventReceiver::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect, HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
if (!RoundedBorderIntersectsRect(mFrame, ToReferenceFrame(), aRect)) {
// aRect doesn't intersect our border-radius curve.
return;
}
aOutFrames->AppendElement(mFrame);
}
bool nsDisplayCompositorHitTestInfo::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
return true;
}
int32_t nsDisplayCompositorHitTestInfo::ZIndex() const {
return mOverrideZIndex ? *mOverrideZIndex : nsDisplayItem::ZIndex();
}
void nsDisplayCompositorHitTestInfo::SetOverrideZIndex(int32_t aZIndex) {
mOverrideZIndex = Some(aZIndex);
}
nsDisplayCaret::nsDisplayCaret(nsDisplayListBuilder* aBuilder,
nsIFrame* aCaretFrame)
: nsPaintedDisplayItem(aBuilder, aCaretFrame),
mCaret(aBuilder->GetCaret()),
mBounds(aBuilder->GetCaretRect() + ToReferenceFrame()) {
MOZ_COUNT_CTOR(nsDisplayCaret);
// The presence of a caret doesn't change the overflow rect
// of the owning frame, so the normal building rect might not
// include the caret at all. We use MarkFrameForDisplay to ensure
// we build this item, and here we override the building rect
// to cover the pixels we're going to draw.
SetBuildingRect(mBounds);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayCaret::~nsDisplayCaret() { MOZ_COUNT_DTOR(nsDisplayCaret); }
#endif
nsRect nsDisplayCaret::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = true;
// The caret returns a rect in the coordinates of mFrame.
return mBounds;
}
void nsDisplayCaret::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
// Note: Because we exist, we know that the caret is visible, so we don't
// need to check for the caret's visibility.
mCaret->PaintCaret(*aCtx->GetDrawTarget(), mFrame, ToReferenceFrame());
}
bool nsDisplayCaret::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
using namespace layers;
nsRect caretRect;
nsRect hookRect;
nscolor caretColor;
nsIFrame* frame =
mCaret->GetPaintGeometry(&caretRect, &hookRect, &caretColor);
if (NS_WARN_IF(!frame) || NS_WARN_IF(frame != mFrame)) {
return true;
}
int32_t appUnitsPerDevPixel = frame->PresContext()->AppUnitsPerDevPixel();
gfx::DeviceColor color = ToDeviceColor(caretColor);
LayoutDeviceRect devCaretRect = LayoutDeviceRect::FromAppUnits(
caretRect + ToReferenceFrame(), appUnitsPerDevPixel);
LayoutDeviceRect devHookRect = LayoutDeviceRect::FromAppUnits(
hookRect + ToReferenceFrame(), appUnitsPerDevPixel);
wr::LayoutRect caret = wr::ToLayoutRect(devCaretRect);
wr::LayoutRect hook = wr::ToLayoutRect(devHookRect);
// Note, WR will pixel snap anything that is layout aligned.
aBuilder.PushRect(caret, caret, !BackfaceIsHidden(), false, false,
wr::ToColorF(color));
if (!devHookRect.IsEmpty()) {
aBuilder.PushRect(hook, hook, !BackfaceIsHidden(), false, false,
wr::ToColorF(color));
}
return true;
}
nsDisplayBorder::nsDisplayBorder(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame)
: nsPaintedDisplayItem(aBuilder, aFrame) {
MOZ_COUNT_CTOR(nsDisplayBorder);
mBounds = CalculateBounds<nsRect>(*mFrame->StyleBorder());
}
bool nsDisplayBorder::IsInvisibleInRect(const nsRect& aRect) const {
nsRect paddingRect = GetPaddingRect();
const nsStyleBorder* styleBorder;
if (paddingRect.Contains(aRect) &&
!(styleBorder = mFrame->StyleBorder())->IsBorderImageSizeAvailable() &&
!nsLayoutUtils::HasNonZeroCorner(styleBorder->mBorderRadius)) {
// aRect is entirely inside the content rect, and no part
// of the border is rendered inside the content rect, so we are not
// visible
// Skip this if there's a border-image (which draws a background
// too) or if there is a border-radius (which makes the border draw
// further in).
return true;
}
return false;
}
nsDisplayItemGeometry* nsDisplayBorder::AllocateGeometry(
nsDisplayListBuilder* aBuilder) {
return new nsDisplayBorderGeometry(this, aBuilder);
}
void nsDisplayBorder::ComputeInvalidationRegion(
nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const {
const auto* geometry = static_cast<const nsDisplayBorderGeometry*>(aGeometry);
bool snap;
if (!geometry->mBounds.IsEqualInterior(GetBounds(aBuilder, &snap))) {
// We can probably get away with only invalidating the difference
// between the border and padding rects, but the XUL ui at least
// is apparently painting a background with this?
aInvalidRegion->Or(GetBounds(aBuilder, &snap), geometry->mBounds);
}
}
bool nsDisplayBorder::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
nsRect rect = nsRect(ToReferenceFrame(), mFrame->GetSize());
ImgDrawResult drawResult = nsCSSRendering::CreateWebRenderCommandsForBorder(
this, mFrame, rect, aBuilder, aResources, aSc, aManager,
aDisplayListBuilder);
if (drawResult == ImgDrawResult::NOT_SUPPORTED) {
return false;
}
return true;
};
void nsDisplayBorder::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
nsPoint offset = ToReferenceFrame();
PaintBorderFlags flags = aBuilder->ShouldSyncDecodeImages()
? PaintBorderFlags::SyncDecodeImages
: PaintBorderFlags();
Unused << nsCSSRendering::PaintBorder(
mFrame->PresContext(), *aCtx, mFrame, GetPaintRect(aBuilder, aCtx),
nsRect(offset, mFrame->GetSize()), mFrame->Style(), flags,
mFrame->GetSkipSides());
}
nsRect nsDisplayBorder::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = true;
return mBounds;
}
void nsDisplayBoxShadowOuter::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsRect borderRect = mFrame->VisualBorderRectRelativeToSelf() + offset;
nsPresContext* presContext = mFrame->PresContext();
AUTO_PROFILER_LABEL("nsDisplayBoxShadowOuter::Paint", GRAPHICS);
nsCSSRendering::PaintBoxShadowOuter(presContext, *aCtx, mFrame, borderRect,
GetPaintRect(aBuilder, aCtx), 1.0f);
}
nsRect nsDisplayBoxShadowOuter::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = false;
return mBounds;
}
nsRect nsDisplayBoxShadowOuter::GetBoundsInternal() {
return nsLayoutUtils::GetBoxShadowRectForFrame(mFrame, mFrame->GetSize()) +
ToReferenceFrame();
}
bool nsDisplayBoxShadowOuter::IsInvisibleInRect(const nsRect& aRect) const {
nsPoint origin = ToReferenceFrame();
nsRect frameRect(origin, mFrame->GetSize());
if (!frameRect.Contains(aRect)) {
return false;
}
// the visible region is entirely inside the border-rect, and box shadows
// never render within the border-rect (unless there's a border radius).
nscoord twipsRadii[8];
bool hasBorderRadii = mFrame->GetBorderRadii(twipsRadii);
if (!hasBorderRadii) {
return true;
}
return RoundedRectContainsRect(frameRect, twipsRadii, aRect);
}
bool nsDisplayBoxShadowOuter::CanBuildWebRenderDisplayItems() const {
auto shadows = mFrame->StyleEffects()->mBoxShadow.AsSpan();
if (shadows.IsEmpty()) {
return false;
}
bool hasBorderRadius;
// We don't support native themed things yet like box shadows around
// input buttons.
//
// TODO(emilio): The non-native theme could provide the right rect+radius
// instead relatively painlessly, if we find this causes performance issues or
// what not.
return !nsCSSRendering::HasBoxShadowNativeTheme(mFrame, hasBorderRadius);
}
bool nsDisplayBoxShadowOuter::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
if (!CanBuildWebRenderDisplayItems()) {
return false;
}
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
nsPoint offset = ToReferenceFrame();
nsRect borderRect = mFrame->VisualBorderRectRelativeToSelf() + offset;
bool snap;
nsRect bounds = GetBounds(aDisplayListBuilder, &snap);
bool hasBorderRadius;
bool nativeTheme =
nsCSSRendering::HasBoxShadowNativeTheme(mFrame, hasBorderRadius);
// Don't need the full size of the shadow rect like we do in
// nsCSSRendering since WR takes care of calculations for blur
// and spread radius.
nsRect frameRect =
nsCSSRendering::GetShadowRect(borderRect, nativeTheme, mFrame);
RectCornerRadii borderRadii;
if (hasBorderRadius) {
hasBorderRadius = nsCSSRendering::GetBorderRadii(frameRect, borderRect,
mFrame, borderRadii);
}
// Everything here is in app units, change to device units.
LayoutDeviceRect clipRect =
LayoutDeviceRect::FromAppUnits(bounds, appUnitsPerDevPixel);
auto shadows = mFrame->StyleEffects()->mBoxShadow.AsSpan();
MOZ_ASSERT(!shadows.IsEmpty());
for (const auto& shadow : Reversed(shadows)) {
if (shadow.inset) {
continue;
}
float blurRadius =
float(shadow.base.blur.ToAppUnits()) / float(appUnitsPerDevPixel);
gfx::sRGBColor shadowColor = nsCSSRendering::GetShadowColor(
shadow.base, mFrame, aBuilder.GetInheritedOpacity());
// We don't move the shadow rect here since WR does it for us
// Now translate everything to device pixels.
const nsRect& shadowRect = frameRect;
LayoutDevicePoint shadowOffset = LayoutDevicePoint::FromAppUnits(
nsPoint(shadow.base.horizontal.ToAppUnits(),
shadow.base.vertical.ToAppUnits()),
appUnitsPerDevPixel);
LayoutDeviceRect deviceBox =
LayoutDeviceRect::FromAppUnits(shadowRect, appUnitsPerDevPixel);
wr::LayoutRect deviceBoxRect = wr::ToLayoutRect(deviceBox);
wr::LayoutRect deviceClipRect = wr::ToLayoutRect(clipRect);
LayoutDeviceSize zeroSize;
wr::BorderRadius borderRadius =
wr::ToBorderRadius(zeroSize, zeroSize, zeroSize, zeroSize);
if (hasBorderRadius) {
borderRadius = wr::ToBorderRadius(
LayoutDeviceSize::FromUnknownSize(borderRadii.TopLeft()),
LayoutDeviceSize::FromUnknownSize(borderRadii.TopRight()),
LayoutDeviceSize::FromUnknownSize(borderRadii.BottomLeft()),
LayoutDeviceSize::FromUnknownSize(borderRadii.BottomRight()));
}
float spreadRadius =
float(shadow.spread.ToAppUnits()) / float(appUnitsPerDevPixel);
aBuilder.PushBoxShadow(deviceBoxRect, deviceClipRect, !BackfaceIsHidden(),
deviceBoxRect, wr::ToLayoutVector2D(shadowOffset),
wr::ToColorF(ToDeviceColor(shadowColor)), blurRadius,
spreadRadius, borderRadius,
wr::BoxShadowClipMode::Outset);
}
return true;
}
void nsDisplayBoxShadowOuter::ComputeInvalidationRegion(
nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const {
const auto* geometry =
static_cast<const nsDisplayItemGenericGeometry*>(aGeometry);
bool snap;
if (!geometry->mBounds.IsEqualInterior(GetBounds(aBuilder, &snap)) ||
!geometry->mBorderRect.IsEqualInterior(GetBorderRect())) {
nsRegion oldShadow, newShadow;
nscoord dontCare[8];
bool hasBorderRadius = mFrame->GetBorderRadii(dontCare);
if (hasBorderRadius) {
// If we have rounded corners then we need to invalidate the frame area
// too since we paint into it.
oldShadow = geometry->mBounds;
newShadow = GetBounds(aBuilder, &snap);
} else {
oldShadow.Sub(geometry->mBounds, geometry->mBorderRect);
newShadow.Sub(GetBounds(aBuilder, &snap), GetBorderRect());
}
aInvalidRegion->Or(oldShadow, newShadow);
}
}
void nsDisplayBoxShadowInner::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
nsPoint offset = ToReferenceFrame();
nsRect borderRect = nsRect(offset, mFrame->GetSize());
nsPresContext* presContext = mFrame->PresContext();
AUTO_PROFILER_LABEL("nsDisplayBoxShadowInner::Paint", GRAPHICS);
nsCSSRendering::PaintBoxShadowInner(presContext, *aCtx, mFrame, borderRect);
}
bool nsDisplayBoxShadowInner::CanCreateWebRenderCommands(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
const nsPoint& aReferenceOffset) {
auto shadows = aFrame->StyleEffects()->mBoxShadow.AsSpan();
if (shadows.IsEmpty()) {
// Means we don't have to paint anything
return true;
}
bool hasBorderRadius;
bool nativeTheme =
nsCSSRendering::HasBoxShadowNativeTheme(aFrame, hasBorderRadius);
// We don't support native themed things yet like box shadows around
// input buttons.
return !nativeTheme;
}
/* static */
void nsDisplayBoxShadowInner::CreateInsetBoxShadowWebRenderCommands(
wr::DisplayListBuilder& aBuilder, const StackingContextHelper& aSc,
nsRect& aVisibleRect, nsIFrame* aFrame, const nsRect& aBorderRect) {
if (!nsCSSRendering::ShouldPaintBoxShadowInner(aFrame)) {
return;
}
int32_t appUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
auto shadows = aFrame->StyleEffects()->mBoxShadow.AsSpan();
LayoutDeviceRect clipRect =
LayoutDeviceRect::FromAppUnits(aVisibleRect, appUnitsPerDevPixel);
for (const auto& shadow : Reversed(shadows)) {
if (!shadow.inset) {
continue;
}
nsRect shadowRect =
nsCSSRendering::GetBoxShadowInnerPaddingRect(aFrame, aBorderRect);
RectCornerRadii innerRadii;
nsCSSRendering::GetShadowInnerRadii(aFrame, aBorderRect, innerRadii);
// Now translate everything to device pixels.
LayoutDeviceRect deviceBoxRect =
LayoutDeviceRect::FromAppUnits(shadowRect, appUnitsPerDevPixel);
wr::LayoutRect deviceClipRect = wr::ToLayoutRect(clipRect);
sRGBColor shadowColor =
nsCSSRendering::GetShadowColor(shadow.base, aFrame, 1.0);
LayoutDevicePoint shadowOffset = LayoutDevicePoint::FromAppUnits(
nsPoint(shadow.base.horizontal.ToAppUnits(),
shadow.base.vertical.ToAppUnits()),
appUnitsPerDevPixel);
float blurRadius =
float(shadow.base.blur.ToAppUnits()) / float(appUnitsPerDevPixel);
wr::BorderRadius borderRadius = wr::ToBorderRadius(
LayoutDeviceSize::FromUnknownSize(innerRadii.TopLeft()),
LayoutDeviceSize::FromUnknownSize(innerRadii.TopRight()),
LayoutDeviceSize::FromUnknownSize(innerRadii.BottomLeft()),
LayoutDeviceSize::FromUnknownSize(innerRadii.BottomRight()));
// NOTE: Any spread radius > 0 will render nothing. WR Bug.
float spreadRadius =
float(shadow.spread.ToAppUnits()) / float(appUnitsPerDevPixel);
aBuilder.PushBoxShadow(
wr::ToLayoutRect(deviceBoxRect), deviceClipRect,
!aFrame->BackfaceIsHidden(), wr::ToLayoutRect(deviceBoxRect),
wr::ToLayoutVector2D(shadowOffset),
wr::ToColorF(ToDeviceColor(shadowColor)), blurRadius, spreadRadius,
borderRadius, wr::BoxShadowClipMode::Inset);
}
}
bool nsDisplayBoxShadowInner::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
if (!CanCreateWebRenderCommands(aDisplayListBuilder, mFrame,
ToReferenceFrame())) {
return false;
}
bool snap;
nsRect visible = GetBounds(aDisplayListBuilder, &snap);
nsPoint offset = ToReferenceFrame();
nsRect borderRect = nsRect(offset, mFrame->GetSize());
nsDisplayBoxShadowInner::CreateInsetBoxShadowWebRenderCommands(
aBuilder, aSc, visible, mFrame, borderRect);
return true;
}
nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayWrapList(aBuilder, aFrame, aList,
aBuilder->CurrentActiveScrolledRoot(), false) {}
nsDisplayWrapList::nsDisplayWrapList(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aActiveScrolledRoot, bool aClearClipChain)
: nsPaintedDisplayItem(aBuilder, aFrame, aActiveScrolledRoot),
mList(aBuilder),
mFrameActiveScrolledRoot(aBuilder->CurrentActiveScrolledRoot()),
mOverrideZIndex(0),
mHasZIndexOverride(false),
mClearingClipChain(aClearClipChain) {
MOZ_COUNT_CTOR(nsDisplayWrapList);
mBaseBuildingRect = GetBuildingRect();
mListPtr = &mList;
mListPtr->AppendToTop(aList);
mOriginalClipChain = mClipChain;
nsDisplayWrapList::UpdateBounds(aBuilder);
}
nsDisplayWrapList::nsDisplayWrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayItem* aItem)
: nsPaintedDisplayItem(aBuilder, aFrame,
aBuilder->CurrentActiveScrolledRoot()),
mList(aBuilder),
mOverrideZIndex(0),
mHasZIndexOverride(false) {
MOZ_COUNT_CTOR(nsDisplayWrapList);
mBaseBuildingRect = GetBuildingRect();
mListPtr = &mList;
mListPtr->AppendToTop(aItem);
mOriginalClipChain = mClipChain;
nsDisplayWrapList::UpdateBounds(aBuilder);
if (!aFrame || !aFrame->IsTransformed()) {
return;
}
// See the previous nsDisplayWrapList constructor
if (aItem->Frame() == aFrame) {
mToReferenceFrame = aItem->ToReferenceFrame();
}
nsRect visible = aBuilder->GetVisibleRect() +
aBuilder->GetCurrentFrameOffsetToReferenceFrame();
SetBuildingRect(visible);
}
nsDisplayWrapList::~nsDisplayWrapList() { MOZ_COUNT_DTOR(nsDisplayWrapList); }
void nsDisplayWrapList::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect, HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
mListPtr->HitTest(aBuilder, aRect, aState, aOutFrames);
}
nsRect nsDisplayWrapList::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = false;
return mBounds;
}
nsRegion nsDisplayWrapList::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = false;
bool snap;
return ::mozilla::GetOpaqueRegion(aBuilder, GetChildren(),
GetBounds(aBuilder, &snap));
}
Maybe<nscolor> nsDisplayWrapList::IsUniform(
nsDisplayListBuilder* aBuilder) const {
// We could try to do something but let's conservatively just return Nothing.
return Nothing();
}
void nsDisplayWrapper::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
NS_ERROR("nsDisplayWrapper should have been flattened away for painting");
}
nsRect nsDisplayWrapList::GetComponentAlphaBounds(
nsDisplayListBuilder* aBuilder) const {
return mListPtr->GetComponentAlphaBounds(aBuilder);
}
bool nsDisplayWrapList::CreateWebRenderCommandsNewClipListOption(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder, bool aNewClipList) {
aManager->CommandBuilder().CreateWebRenderCommandsFromDisplayList(
GetChildren(), this, aDisplayListBuilder, aSc, aBuilder, aResources,
aNewClipList);
return true;
}
static nsresult WrapDisplayList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
nsDisplayItemWrapper* aWrapper) {
if (!aList->GetTop()) {
return NS_OK;
}
nsDisplayItem* item = aWrapper->WrapList(aBuilder, aFrame, aList);
if (!item) {
return NS_ERROR_OUT_OF_MEMORY;
}
// aList was emptied
aList->AppendToTop(item);
return NS_OK;
}
static nsresult WrapEachDisplayItem(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList,
nsDisplayItemWrapper* aWrapper) {
for (nsDisplayItem* item : aList->TakeItems()) {
item = aWrapper->WrapItem(aBuilder, item);
if (!item) {
return NS_ERROR_OUT_OF_MEMORY;
}
aList->AppendToTop(item);
}
// aList was emptied
return NS_OK;
}
nsresult nsDisplayItemWrapper::WrapLists(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
const nsDisplayListSet& aIn,
const nsDisplayListSet& aOut) {
nsresult rv = WrapListsInPlace(aBuilder, aFrame, aIn);
NS_ENSURE_SUCCESS(rv, rv);
if (&aOut == &aIn) {
return NS_OK;
}
aOut.BorderBackground()->AppendToTop(aIn.BorderBackground());
aOut.BlockBorderBackgrounds()->AppendToTop(aIn.BlockBorderBackgrounds());
aOut.Floats()->AppendToTop(aIn.Floats());
aOut.Content()->AppendToTop(aIn.Content());
aOut.PositionedDescendants()->AppendToTop(aIn.PositionedDescendants());
aOut.Outlines()->AppendToTop(aIn.Outlines());
return NS_OK;
}
nsresult nsDisplayItemWrapper::WrapListsInPlace(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
const nsDisplayListSet& aLists) {
nsresult rv;
if (WrapBorderBackground()) {
// Our border-backgrounds are in-flow
rv = WrapDisplayList(aBuilder, aFrame, aLists.BorderBackground(), this);
NS_ENSURE_SUCCESS(rv, rv);
}
// Our block border-backgrounds are in-flow
rv = WrapDisplayList(aBuilder, aFrame, aLists.BlockBorderBackgrounds(), this);
NS_ENSURE_SUCCESS(rv, rv);
// The floats are not in flow
rv = WrapEachDisplayItem(aBuilder, aLists.Floats(), this);
NS_ENSURE_SUCCESS(rv, rv);
// Our child content is in flow
rv = WrapDisplayList(aBuilder, aFrame, aLists.Content(), this);
NS_ENSURE_SUCCESS(rv, rv);
// The positioned descendants may not be in-flow
rv = WrapEachDisplayItem(aBuilder, aLists.PositionedDescendants(), this);
NS_ENSURE_SUCCESS(rv, rv);
// The outlines may not be in-flow
return WrapEachDisplayItem(aBuilder, aLists.Outlines(), this);
}
nsDisplayOpacity::nsDisplayOpacity(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aActiveScrolledRoot, bool aForEventsOnly,
bool aNeedsActiveLayer, bool aWrapsBackdropFilter)
: nsDisplayWrapList(aBuilder, aFrame, aList, aActiveScrolledRoot, true),
mOpacity(aFrame->StyleEffects()->mOpacity),
mForEventsOnly(aForEventsOnly),
mNeedsActiveLayer(aNeedsActiveLayer),
mChildOpacityState(ChildOpacityState::Unknown),
mWrapsBackdropFilter(aWrapsBackdropFilter) {
MOZ_COUNT_CTOR(nsDisplayOpacity);
}
void nsDisplayOpacity::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
nsDisplayItem::HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
AutoRestore<float> opacity(aState->mCurrentOpacity);
aState->mCurrentOpacity *= mOpacity;
// TODO(emilio): special-casing zero is a bit arbitrary... Maybe we should
// only consider fully opaque items? Or make this configurable somehow?
if (aBuilder->HitTestIsForVisibility() && mOpacity == 0.0f) {
return;
}
nsDisplayWrapList::HitTest(aBuilder, aRect, aState, aOutFrames);
}
nsRegion nsDisplayOpacity::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = false;
// The only time where mOpacity == 1.0 should be when we have will-change.
// We could report this as opaque then but when the will-change value starts
// animating the element would become non opaque and could cause repaints.
return nsRegion();
}
void nsDisplayOpacity::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
if (GetOpacity() == 0.0f) {
return;
}
if (GetOpacity() == 1.0f) {
GetChildren()->Paint(aBuilder, aCtx,
mFrame->PresContext()->AppUnitsPerDevPixel());
return;
}
// TODO: Compute a bounds rect to pass to PushLayer for a smaller
// allocation.
aCtx->GetDrawTarget()->PushLayer(false, GetOpacity(), nullptr, gfx::Matrix());
GetChildren()->Paint(aBuilder, aCtx,
mFrame->PresContext()->AppUnitsPerDevPixel());
aCtx->GetDrawTarget()->PopLayer();
}
/* static */
bool nsDisplayOpacity::NeedsActiveLayer(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame) {
return EffectCompositor::HasAnimationsForCompositor(
aFrame, DisplayItemType::TYPE_OPACITY) ||
(ActiveLayerTracker::IsStyleAnimated(
aBuilder, aFrame, nsCSSPropertyIDSet::OpacityProperties()));
}
bool nsDisplayOpacity::CanApplyOpacity(WebRenderLayerManager* aManager,
nsDisplayListBuilder* aBuilder) const {
return !EffectCompositor::HasAnimationsForCompositor(
mFrame, DisplayItemType::TYPE_OPACITY);
}
// Only try folding our opacity down if we have at most |kOpacityMaxChildCount|
// children that don't overlap and can all apply the opacity to themselves.
static const size_t kOpacityMaxChildCount = 3;
// |kOpacityMaxListSize| defines an early exit condition for opacity items that
// are likely have more child items than |kOpacityMaxChildCount|.
static const size_t kOpacityMaxListSize = kOpacityMaxChildCount * 2;
/**
* Recursively iterates through |aList| and collects at most
* |kOpacityMaxChildCount| display item pointers to items that return true for
* CanApplyOpacity(). The item pointers are added to |aArray|.
*
* LayerEventRegions and WrapList items are ignored.
*
* We need to do this recursively, because the child display items might contain
* nested nsDisplayWrapLists.
*
* Returns false if there are more than |kOpacityMaxChildCount| items, or if an
* item that returns false for CanApplyOpacity() is encountered.
* Otherwise returns true.
*/
static bool CollectItemsWithOpacity(WebRenderLayerManager* aManager,
nsDisplayListBuilder* aBuilder,
nsDisplayList* aList,
nsTArray<nsPaintedDisplayItem*>& aArray) {
if (aList->Length() > kOpacityMaxListSize) {
// Exit early, since |aList| will likely contain more than
// |kOpacityMaxChildCount| items.
return false;
}
for (nsDisplayItem* i : *aList) {
const DisplayItemType type = i->GetType();
if (type == DisplayItemType::TYPE_COMPOSITOR_HITTEST_INFO) {
continue;
}
// Descend only into wraplists.
if (type == DisplayItemType::TYPE_WRAP_LIST ||
type == DisplayItemType::TYPE_CONTAINER) {
// The current display item has children, process them first.
if (!CollectItemsWithOpacity(aManager, aBuilder, i->GetChildren(),
aArray)) {
return false;
}
continue;
}
if (aArray.Length() == kOpacityMaxChildCount) {
return false;
}
auto* item = i->AsPaintedDisplayItem();
if (!item || !item->CanApplyOpacity(aManager, aBuilder)) {
return false;
}
aArray.AppendElement(item);
}
return true;
}
bool nsDisplayOpacity::CanApplyToChildren(WebRenderLayerManager* aManager,
nsDisplayListBuilder* aBuilder) {
if (mChildOpacityState == ChildOpacityState::Deferred) {
return false;
}
// Iterate through the child display list and copy at most
// |kOpacityMaxChildCount| child display item pointers to a temporary list.
AutoTArray<nsPaintedDisplayItem*, kOpacityMaxChildCount> items;
if (!CollectItemsWithOpacity(aManager, aBuilder, &mList, items)) {
mChildOpacityState = ChildOpacityState::Deferred;
return false;
}
struct {
nsPaintedDisplayItem* item{};
nsRect bounds;
} children[kOpacityMaxChildCount];
bool snap;
size_t childCount = 0;
for (nsPaintedDisplayItem* item : items) {
children[childCount].item = item;
children[childCount].bounds = item->GetBounds(aBuilder, &snap);
childCount++;
}
for (size_t i = 0; i < childCount; i++) {
for (size_t j = i + 1; j < childCount; j++) {
if (children[i].bounds.Intersects(children[j].bounds)) {
mChildOpacityState = ChildOpacityState::Deferred;
return false;
}
}
}
mChildOpacityState = ChildOpacityState::Applied;
return true;
}
/**
* Returns true if this nsDisplayOpacity contains only a filter or a mask item
* that has the same frame as the opacity item, and that supports painting with
* opacity. In this case the opacity item can be optimized away.
*/
bool nsDisplayOpacity::ApplyToMask() {
if (mList.Length() != 1) {
return false;
}
nsDisplayItem* item = mList.GetBottom();
if (item->Frame() != mFrame) {
// The effect item needs to have the same frame as the opacity item.
return false;
}
const DisplayItemType type = item->GetType();
if (type == DisplayItemType::TYPE_MASK) {
return true;
}
return false;
}
bool nsDisplayOpacity::CanApplyOpacityToChildren(
WebRenderLayerManager* aManager, nsDisplayListBuilder* aBuilder,
float aInheritedOpacity) {
if (mFrame->GetPrevContinuation() || mFrame->GetNextContinuation() ||
mFrame->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) {
// If we've been split, then we might need to merge, so
// don't flatten us away.
return false;
}
if (mNeedsActiveLayer || mOpacity == 0.0) {
// If our opacity is zero then we'll discard all descendant display items
// except for layer event regions, so there's no point in doing this
// optimization (and if we do do it, then invalidations of those descendants
// might trigger repainting).
return false;
}
if (mList.IsEmpty()) {
return false;
}
// We can only flatten opacity items into a mask if we haven't
// already flattened an earlier ancestor, since the SVG code pulls the opacity
// from style directly, and won't know about the outer opacity value.
if (aInheritedOpacity == 1.0f && ApplyToMask()) {
MOZ_ASSERT(SVGIntegrationUtils::UsingEffectsForFrame(mFrame));
mChildOpacityState = ChildOpacityState::Applied;
return true;
}
// Return true if we successfully applied opacity to child items.
return CanApplyToChildren(aManager, aBuilder);
}
void nsDisplayOpacity::ComputeInvalidationRegion(
nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const {
const auto* geometry =
static_cast<const nsDisplayOpacityGeometry*>(aGeometry);
bool snap;
if (mOpacity != geometry->mOpacity) {
aInvalidRegion->Or(GetBounds(aBuilder, &snap), geometry->mBounds);
}
}
void nsDisplayOpacity::WriteDebugInfo(std::stringstream& aStream) {
aStream << " (opacity " << mOpacity << ", mChildOpacityState: ";
switch (mChildOpacityState) {
case ChildOpacityState::Unknown:
aStream << "Unknown";
break;
case ChildOpacityState::Applied:
aStream << "Applied";
break;
case ChildOpacityState::Deferred:
aStream << "Deferred";
break;
default:
break;
}
aStream << ")";
}
bool nsDisplayOpacity::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
MOZ_ASSERT(mChildOpacityState != ChildOpacityState::Applied);
float oldOpacity = aBuilder.GetInheritedOpacity();
const DisplayItemClipChain* oldClipChain = aBuilder.GetInheritedClipChain();
aBuilder.SetInheritedOpacity(1.0f);
aBuilder.SetInheritedClipChain(nullptr);
float opacity = mOpacity * oldOpacity;
float* opacityForSC = &opacity;
uint64_t animationsId =
AddAnimationsForWebRender(this, aManager, aDisplayListBuilder);
wr::WrAnimationProperty prop{
wr::WrAnimationType::Opacity,
animationsId,
};
wr::StackingContextParams params;
params.animation = animationsId ? &prop : nullptr;
params.opacity = opacityForSC;
params.clip =
wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
if (mWrapsBackdropFilter) {
params.flags |= wr::StackingContextFlags::WRAPS_BACKDROP_FILTER;
}
StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
params);
aManager->CommandBuilder().CreateWebRenderCommandsFromDisplayList(
&mList, this, aDisplayListBuilder, sc, aBuilder, aResources);
aBuilder.SetInheritedOpacity(oldOpacity);
aBuilder.SetInheritedClipChain(oldClipChain);
return true;
}
nsDisplayBlendMode::nsDisplayBlendMode(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
StyleBlend aBlendMode, const ActiveScrolledRoot* aActiveScrolledRoot,
const bool aIsForBackground)
: nsDisplayWrapList(aBuilder, aFrame, aList, aActiveScrolledRoot, true),
mBlendMode(aBlendMode),
mIsForBackground(aIsForBackground) {
MOZ_COUNT_CTOR(nsDisplayBlendMode);
}
nsRegion nsDisplayBlendMode::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = false;
// We are never considered opaque
return nsRegion();
}
bool nsDisplayBlendMode::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
wr::StackingContextParams params;
params.mix_blend_mode =
wr::ToMixBlendMode(nsCSSRendering::GetGFXBlendMode(mBlendMode));
params.clip =
wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
params);
return nsDisplayWrapList::CreateWebRenderCommands(
aBuilder, aResources, sc, aManager, aDisplayListBuilder);
}
void nsDisplayBlendMode::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
// This should be switched to use PushLayerWithBlend, once it's
// been implemented for all DrawTarget backends.
DrawTarget* dt = aCtx->GetDrawTarget();
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
Rect rect = NSRectToRect(GetPaintRect(aBuilder, aCtx), appUnitsPerDevPixel);
rect.RoundOut();
// Create a temporary DrawTarget that is clipped to the area that
// we're going to draw to. This will include the same transform as
// is currently on |dt|.
RefPtr<DrawTarget> temp =
dt->CreateClippedDrawTarget(rect, SurfaceFormat::B8G8R8A8);
if (!temp) {
return;
}
gfxContext ctx(temp, /* aPreserveTransform */ true);
GetChildren()->Paint(aBuilder, &ctx,
mFrame->PresContext()->AppUnitsPerDevPixel());
// Draw the temporary DT to the real destination, applying the blend mode, but
// no transform.
temp->Flush();
RefPtr<SourceSurface> surface = temp->Snapshot();
gfxContextMatrixAutoSaveRestore saveMatrix(aCtx);
dt->SetTransform(Matrix());
dt->DrawSurface(
surface, Rect(surface->GetRect()), Rect(surface->GetRect()),
DrawSurfaceOptions(),
DrawOptions(1.0f, nsCSSRendering::GetGFXBlendMode(mBlendMode)));
}
gfx::CompositionOp nsDisplayBlendMode::BlendMode() {
return nsCSSRendering::GetGFXBlendMode(mBlendMode);
}
bool nsDisplayBlendMode::CanMerge(const nsDisplayItem* aItem) const {
// Items for the same content element should be merged into a single
// compositing group.
if (!HasDifferentFrame(aItem) || !HasSameTypeAndClip(aItem) ||
!HasSameContent(aItem)) {
return false;
}
const auto* item = static_cast<const nsDisplayBlendMode*>(aItem);
if (mIsForBackground || item->mIsForBackground) {
// Don't merge background-blend-mode items
return false;
}
return true;
}
/* static */
nsDisplayBlendContainer* nsDisplayBlendContainer::CreateForMixBlendMode(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aActiveScrolledRoot) {
return MakeDisplayItem<nsDisplayBlendContainer>(aBuilder, aFrame, aList,
aActiveScrolledRoot, false);
}
/* static */
nsDisplayBlendContainer* nsDisplayBlendContainer::CreateForBackgroundBlendMode(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame* aSecondaryFrame,
nsDisplayList* aList, const ActiveScrolledRoot* aActiveScrolledRoot) {
if (aSecondaryFrame) {
auto type = GetTableTypeFromFrame(aFrame);
auto index = static_cast<uint16_t>(type);
return MakeDisplayItemWithIndex<nsDisplayTableBlendContainer>(
aBuilder, aSecondaryFrame, index, aList, aActiveScrolledRoot, true,
aFrame);
}
return MakeDisplayItemWithIndex<nsDisplayBlendContainer>(
aBuilder, aFrame, 1, aList, aActiveScrolledRoot, true);
}
nsDisplayBlendContainer::nsDisplayBlendContainer(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aActiveScrolledRoot, bool aIsForBackground)
: nsDisplayWrapList(aBuilder, aFrame, aList, aActiveScrolledRoot, true),
mIsForBackground(aIsForBackground) {
MOZ_COUNT_CTOR(nsDisplayBlendContainer);
}
void nsDisplayBlendContainer::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
aCtx->GetDrawTarget()->PushLayer(false, 1.0, nullptr, gfx::Matrix());
GetChildren()->Paint(aBuilder, aCtx,
mFrame->PresContext()->AppUnitsPerDevPixel());
aCtx->GetDrawTarget()->PopLayer();
}
bool nsDisplayBlendContainer::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
wr::StackingContextParams params;
params.flags |= wr::StackingContextFlags::IS_BLEND_CONTAINER;
params.clip =
wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
params);
return nsDisplayWrapList::CreateWebRenderCommands(
aBuilder, aResources, sc, aManager, aDisplayListBuilder);
}
nsDisplayOwnLayer::nsDisplayOwnLayer(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aActiveScrolledRoot,
nsDisplayOwnLayerFlags aFlags, const ScrollbarData& aScrollbarData,
bool aForceActive, bool aClearClipChain)
: nsDisplayWrapList(aBuilder, aFrame, aList, aActiveScrolledRoot,
aClearClipChain),
mFlags(aFlags),
mScrollbarData(aScrollbarData),
mForceActive(aForceActive),
mWrAnimationId(0) {
MOZ_COUNT_CTOR(nsDisplayOwnLayer);
}
bool nsDisplayOwnLayer::IsScrollThumbLayer() const {
return mScrollbarData.mScrollbarLayerType == ScrollbarLayerType::Thumb;
}
bool nsDisplayOwnLayer::IsScrollbarContainer() const {
return mScrollbarData.mScrollbarLayerType == ScrollbarLayerType::Container;
}
bool nsDisplayOwnLayer::IsRootScrollbarContainer() const {
return IsScrollbarContainer() && IsScrollbarLayerForRoot();
}
bool nsDisplayOwnLayer::IsScrollbarLayerForRoot() const {
return mFrame->PresContext()->IsRootContentDocumentCrossProcess() &&
mScrollbarData.mTargetViewId ==
nsLayoutUtils::ScrollIdForRootScrollFrame(mFrame->PresContext());
}
bool nsDisplayOwnLayer::IsZoomingLayer() const {
return GetType() == DisplayItemType::TYPE_ASYNC_ZOOM;
}
bool nsDisplayOwnLayer::IsFixedPositionLayer() const {
return GetType() == DisplayItemType::TYPE_FIXED_POSITION ||
GetType() == DisplayItemType::TYPE_TABLE_FIXED_POSITION;
}
bool nsDisplayOwnLayer::IsStickyPositionLayer() const {
return GetType() == DisplayItemType::TYPE_STICKY_POSITION;
}
bool nsDisplayOwnLayer::HasDynamicToolbar() const {
if (!mFrame->PresContext()->IsRootContentDocumentCrossProcess()) {
return false;
}
return mFrame->PresContext()->HasDynamicToolbar() ||
// For tests on Android, this pref is set to simulate the dynamic
// toolbar
StaticPrefs::apz_fixed_margin_override_enabled();
}
bool nsDisplayOwnLayer::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
Maybe<wr::WrAnimationProperty> prop;
bool needsProp = aManager->LayerManager()->AsyncPanZoomEnabled() &&
(IsScrollThumbLayer() || IsZoomingLayer() ||
ShouldGetFixedOrStickyAnimationId() ||
(IsRootScrollbarContainer() && HasDynamicToolbar()));
if (needsProp) {
// APZ is enabled and this is a scroll thumb or zooming layer, so we need
// to create and set an animation id. That way APZ can adjust the position/
// zoom of this content asynchronously as needed.
RefPtr<WebRenderAPZAnimationData> animationData =
aManager->CommandBuilder()
.CreateOrRecycleWebRenderUserData<WebRenderAPZAnimationData>(this);
mWrAnimationId = animationData->GetAnimationId();
prop.emplace();
prop->id = mWrAnimationId;
prop->key = wr::SpatialKey(uint64_t(mFrame), GetPerFrameKey(),
wr::SpatialKeyKind::APZ);
prop->effect_type = wr::WrAnimationType::Transform;
}
wr::StackingContextParams params;
params.animation = prop.ptrOr(nullptr);
params.clip =
wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
if (IsScrollbarContainer() && IsRootScrollbarContainer()) {
params.prim_flags |= wr::PrimitiveFlags::IS_SCROLLBAR_CONTAINER;
}
if (IsZoomingLayer() ||
(ShouldGetFixedOrStickyAnimationId() ||
(IsRootScrollbarContainer() && HasDynamicToolbar()))) {
params.is_2d_scale_translation = true;
params.should_snap = true;
}
StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
params);
nsDisplayWrapList::CreateWebRenderCommands(aBuilder, aResources, sc, aManager,
aDisplayListBuilder);
return true;
}
bool nsDisplayOwnLayer::UpdateScrollData(WebRenderScrollData* aData,
WebRenderLayerScrollData* aLayerData) {
bool isRelevantToApz =
(IsScrollThumbLayer() || IsScrollbarContainer() || IsZoomingLayer() ||
ShouldGetFixedOrStickyAnimationId());
if (!isRelevantToApz) {
return false;
}
if (!aLayerData) {
return true;
}
if (IsZoomingLayer()) {
aLayerData->SetZoomAnimationId(mWrAnimationId);
return true;
}
if (IsFixedPositionLayer() && ShouldGetFixedOrStickyAnimationId()) {
aLayerData->SetFixedPositionAnimationId(mWrAnimationId);
return true;
}
if (IsStickyPositionLayer() && ShouldGetFixedOrStickyAnimationId()) {
aLayerData->SetStickyPositionAnimationId(mWrAnimationId);
return true;
}
MOZ_ASSERT(IsScrollbarContainer() || IsScrollThumbLayer());
aLayerData->SetScrollbarData(mScrollbarData);
if (IsRootScrollbarContainer() && HasDynamicToolbar()) {
aLayerData->SetScrollbarAnimationId(mWrAnimationId);
return true;
}
if (IsScrollThumbLayer()) {
aLayerData->SetScrollbarAnimationId(mWrAnimationId);
LayoutDeviceRect bounds = LayoutDeviceIntRect::FromAppUnits(
mBounds, mFrame->PresContext()->AppUnitsPerDevPixel());
// Subframe scrollbars are subject to the pinch-zoom scale,
// but root scrollbars are not because they are outside of the
// region that is zoomed.
const float resolution =
IsScrollbarLayerForRoot()
? 1.0f
: mFrame->PresShell()->GetCumulativeResolution();
LayerIntRect layerBounds =
RoundedOut(bounds * LayoutDeviceToLayerScale(resolution));
aLayerData->SetVisibleRect(layerBounds);
}
return true;
}
void nsDisplayOwnLayer::WriteDebugInfo(std::stringstream& aStream) {
aStream << nsPrintfCString(" (flags 0x%x) (scrolltarget %" PRIu64 ")",
(int)mFlags, mScrollbarData.mTargetViewId)
.get();
}
nsDisplaySubDocument::nsDisplaySubDocument(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsSubDocumentFrame* aSubDocFrame,
nsDisplayList* aList,
nsDisplayOwnLayerFlags aFlags)
: nsDisplayOwnLayer(aBuilder, aFrame, aList,
aBuilder->CurrentActiveScrolledRoot(), aFlags),
mScrollParentId(aBuilder->GetCurrentScrollParentId()),
mShouldFlatten(false),
mSubDocFrame(aSubDocFrame) {
MOZ_COUNT_CTOR(nsDisplaySubDocument);
if (mSubDocFrame && mSubDocFrame != mFrame) {
mSubDocFrame->AddDisplayItem(this);
}
}
nsDisplaySubDocument::~nsDisplaySubDocument() {
MOZ_COUNT_DTOR(nsDisplaySubDocument);
if (mSubDocFrame) {
mSubDocFrame->RemoveDisplayItem(this);
}
}
nsIFrame* nsDisplaySubDocument::FrameForInvalidation() const {
return mSubDocFrame ? mSubDocFrame : mFrame;
}
void nsDisplaySubDocument::RemoveFrame(nsIFrame* aFrame) {
if (aFrame == mSubDocFrame) {
mSubDocFrame = nullptr;
SetDeletedFrame();
}
nsDisplayOwnLayer::RemoveFrame(aFrame);
}
static bool UseDisplayPortForViewport(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame) {
return aBuilder->IsPaintingToWindow() &&
DisplayPortUtils::ViewportHasDisplayPort(aFrame->PresContext());
}
nsRect nsDisplaySubDocument::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
bool usingDisplayPort = UseDisplayPortForViewport(aBuilder, mFrame);
if ((mFlags & nsDisplayOwnLayerFlags::GenerateScrollableLayer) &&
usingDisplayPort) {
*aSnap = false;
return mFrame->GetRect() + aBuilder->ToReferenceFrame(mFrame);
}
return nsDisplayOwnLayer::GetBounds(aBuilder, aSnap);
}
nsRegion nsDisplaySubDocument::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
bool usingDisplayPort = UseDisplayPortForViewport(aBuilder, mFrame);
if ((mFlags & nsDisplayOwnLayerFlags::GenerateScrollableLayer) &&
usingDisplayPort) {
*aSnap = false;
return nsRegion();
}
return nsDisplayOwnLayer::GetOpaqueRegion(aBuilder, aSnap);
}
/* static */
nsDisplayFixedPosition* nsDisplayFixedPosition::CreateForFixedBackground(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsIFrame* aSecondaryFrame,
nsDisplayBackgroundImage* aImage, const uint16_t aIndex,
const ActiveScrolledRoot* aScrollTargetASR) {
nsDisplayList temp(aBuilder);
temp.AppendToTop(aImage);
if (aSecondaryFrame) {
auto tableType = GetTableTypeFromFrame(aFrame);
const uint16_t index = CalculateTablePerFrameKey(aIndex + 1, tableType);
return MakeDisplayItemWithIndex<nsDisplayTableFixedPosition>(
aBuilder, aSecondaryFrame, index, &temp, aFrame, aScrollTargetASR);
}
return MakeDisplayItemWithIndex<nsDisplayFixedPosition>(
aBuilder, aFrame, aIndex + 1, &temp, aScrollTargetASR);
}
nsDisplayFixedPosition::nsDisplayFixedPosition(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aActiveScrolledRoot,
const ActiveScrolledRoot* aScrollTargetASR)
: nsDisplayOwnLayer(aBuilder, aFrame, aList, aActiveScrolledRoot),
mScrollTargetASR(aScrollTargetASR),
mIsFixedBackground(false) {
MOZ_COUNT_CTOR(nsDisplayFixedPosition);
}
nsDisplayFixedPosition::nsDisplayFixedPosition(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aScrollTargetASR)
: nsDisplayOwnLayer(aBuilder, aFrame, aList,
aBuilder->CurrentActiveScrolledRoot()),
// For fixed backgrounds, this is the ASR for the nearest scroll frame.
mScrollTargetASR(aScrollTargetASR),
mIsFixedBackground(true) {
MOZ_COUNT_CTOR(nsDisplayFixedPosition);
}
ScrollableLayerGuid::ViewID nsDisplayFixedPosition::GetScrollTargetId() const {
if (mScrollTargetASR &&
(mIsFixedBackground || !nsLayoutUtils::IsReallyFixedPos(mFrame))) {
return mScrollTargetASR->GetViewId();
}
return nsLayoutUtils::ScrollIdForRootScrollFrame(mFrame->PresContext());
}
bool nsDisplayFixedPosition::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
SideBits sides = SideBits::eNone;
if (!mIsFixedBackground) {
sides = nsLayoutUtils::GetSideBitsForFixedPositionContent(mFrame);
}
// We install this RAII scrolltarget tracker so that any
// nsDisplayCompositorHitTestInfo items inside this fixed-pos item (and that
// share the same ASR as this item) use the correct scroll target. That way
// attempts to scroll on those items will scroll the root scroll frame.
wr::DisplayListBuilder::FixedPosScrollTargetTracker tracker(
aBuilder, GetActiveScrolledRoot(), GetScrollTargetId(), sides);
return nsDisplayOwnLayer::CreateWebRenderCommands(
aBuilder, aResources, aSc, aManager, aDisplayListBuilder);
}
bool nsDisplayFixedPosition::UpdateScrollData(
WebRenderScrollData* aData, WebRenderLayerScrollData* aLayerData) {
if (aLayerData) {
if (!mIsFixedBackground) {
aLayerData->SetFixedPositionSides(
nsLayoutUtils::GetSideBitsForFixedPositionContent(mFrame));
}
aLayerData->SetFixedPositionScrollContainerId(GetScrollTargetId());
}
nsDisplayOwnLayer::UpdateScrollData(aData, aLayerData);
return true;
}
bool nsDisplayFixedPosition::ShouldGetFixedOrStickyAnimationId() {
#if defined(MOZ_WIDGET_ANDROID)
return mFrame->PresContext()->IsRootContentDocumentCrossProcess() &&
nsLayoutUtils::ScrollIdForRootScrollFrame(mFrame->PresContext()) ==
GetScrollTargetId();
#else
return false;
#endif
}
void nsDisplayFixedPosition::WriteDebugInfo(std::stringstream& aStream) {
aStream << nsPrintfCString(
" (containerASR %s) (scrolltarget %" PRIu64 ")",
ActiveScrolledRoot::ToString(mScrollTargetASR).get(),
GetScrollTargetId())
.get();
}
TableType GetTableTypeFromFrame(nsIFrame* aFrame) {
if (aFrame->IsTableFrame()) {
return TableType::Table;
}
if (aFrame->IsTableColFrame()) {
return TableType::TableCol;
}
if (aFrame->IsTableColGroupFrame()) {
return TableType::TableColGroup;
}
if (aFrame->IsTableRowFrame()) {
return TableType::TableRow;
}
if (aFrame->IsTableRowGroupFrame()) {
return TableType::TableRowGroup;
}
if (aFrame->IsTableCellFrame()) {
return TableType::TableCell;
}
MOZ_ASSERT_UNREACHABLE("Invalid frame.");
return TableType::Table;
}
nsDisplayTableFixedPosition::nsDisplayTableFixedPosition(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
nsIFrame* aAncestorFrame, const ActiveScrolledRoot* aScrollTargetASR)
: nsDisplayFixedPosition(aBuilder, aFrame, aList, aScrollTargetASR),
mAncestorFrame(aAncestorFrame) {
if (aBuilder->IsRetainingDisplayList()) {
mAncestorFrame->AddDisplayItem(this);
}
}
nsDisplayStickyPosition::nsDisplayStickyPosition(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aActiveScrolledRoot,
const ActiveScrolledRoot* aContainerASR, bool aClippedToDisplayPort)
: nsDisplayOwnLayer(aBuilder, aFrame, aList, aActiveScrolledRoot),
mContainerASR(aContainerASR),
mClippedToDisplayPort(aClippedToDisplayPort),
mShouldFlatten(false) {
MOZ_COUNT_CTOR(nsDisplayStickyPosition);
}
// Returns the smallest distance from "0" to the range [min, max] where
// min <= max. Despite the name, the return value is actually a 1-D vector,
// and so may be negative if max < 0.
static nscoord DistanceToRange(nscoord min, nscoord max) {
MOZ_ASSERT(min <= max);
if (max < 0) {
return max;
}
if (min > 0) {
return min;
}
MOZ_ASSERT(min <= 0 && max >= 0);
return 0;
}
// Returns the magnitude of the part of the range [min, max] that is greater
// than zero. The return value is always non-negative.
static nscoord PositivePart(nscoord min, nscoord max) {
MOZ_ASSERT(min <= max);
if (min >= 0) {
return max - min;
}
if (max > 0) {
return max;
}
return 0;
}
// Returns the magnitude of the part of the range [min, max] that is less
// than zero. The return value is always non-negative.
static nscoord NegativePart(nscoord min, nscoord max) {
MOZ_ASSERT(min <= max);
if (max <= 0) {
return max - min;
}
if (min < 0) {
return 0 - min;
}
return 0;
}
StickyScrollContainer* nsDisplayStickyPosition::GetStickyScrollContainer() {
StickyScrollContainer* stickyScrollContainer =
StickyScrollContainer::GetStickyScrollContainerForFrame(mFrame);
if (stickyScrollContainer) {
// If there's no ASR for the scrollframe that this sticky item is attached
// to, then don't create a WR sticky item for it either. Trying to do so
// will end in sadness because WR will interpret some coordinates as
// relative to the nearest enclosing scrollframe, which will correspond
// to the nearest ancestor ASR on the gecko side. That ASR will not be the
// same as the scrollframe this sticky item is actually supposed to be
// attached to, thus the sadness.
// Not sending WR the sticky item is ok, because the enclosing scrollframe
// will never be asynchronously scrolled. Instead we will always position
// the sticky items correctly on the gecko side and WR will never need to
// adjust their position itself.
MOZ_ASSERT(
stickyScrollContainer->ScrollFrame()->IsMaybeAsynchronouslyScrolled());
if (!stickyScrollContainer->ScrollFrame()
->IsMaybeAsynchronouslyScrolled()) {
stickyScrollContainer = nullptr;
}
}
return stickyScrollContainer;
}
bool nsDisplayStickyPosition::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
StickyScrollContainer* stickyScrollContainer = GetStickyScrollContainer();
Maybe<wr::SpaceAndClipChainHelper> saccHelper;
if (stickyScrollContainer) {
float auPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
bool snap;
nsRect itemBounds = GetBounds(aDisplayListBuilder, &snap);
Maybe<float> topMargin;
Maybe<float> rightMargin;
Maybe<float> bottomMargin;
Maybe<float> leftMargin;
wr::StickyOffsetBounds vBounds = {0.0, 0.0};
wr::StickyOffsetBounds hBounds = {0.0, 0.0};
nsPoint appliedOffset;
nsRectAbsolute outer;
nsRectAbsolute inner;
stickyScrollContainer->GetScrollRanges(mFrame, &outer, &inner);
nsIFrame* scrollFrame = do_QueryFrame(stickyScrollContainer->ScrollFrame());
nsPoint offset =
scrollFrame->GetOffsetToCrossDoc(Frame()) + ToReferenceFrame();
// Adjust the scrollPort coordinates to be relative to the reference frame,
// so that it is in the same space as everything else.
nsRect scrollPort =
stickyScrollContainer->ScrollFrame()->GetScrollPortRect();
scrollPort += offset;
// The following computations make more sense upon understanding the
// semantics of "inner" and "outer", which is explained in the comment on
// SetStickyPositionData in Layers.h.
if (outer.YMost() != inner.YMost()) {
// Question: How far will itemBounds.y be from the top of the scrollport
// when we have scrolled from the current scroll position of "0" to
// reach the range [inner.YMost(), outer.YMost()] where the item gets
// stuck?
// Answer: the current distance is "itemBounds.y - scrollPort.y". That
// needs to be adjusted by the distance to the range, less any other
// sticky ranges that fall between 0 and the range. If the distance is
// negative (i.e. inner.YMost() <= outer.YMost() < 0) then we would be
// scrolling upwards (decreasing scroll offset) to reach that range,
// which would increase itemBounds.y and make it farther away from the
// top of the scrollport. So in that case the adjustment is -distance.
// If the distance is positive (0 < inner.YMost() <= outer.YMost()) then
// we would be scrolling downwards, itemBounds.y would decrease, and we
// again need to adjust by -distance. If we are already in the range
// then no adjustment is needed and distance is 0 so again using
// -distance works. If the distance is positive, and the item has both
// top and bottom sticky ranges, then the bottom sticky range may fall
// (entirely[1] or partly[2]) between the current scroll position.
// [1]: 0 <= outer.Y() <= inner.Y() < inner.YMost() <= outer.YMost()
// [2]: outer.Y() < 0 <= inner.Y() < inner.YMost() <= outer.YMost()
// In these cases, the item doesn't actually move for that part of the
// distance, so we need to subtract out that bit, which can be computed
// as the positive portion of the range [outer.Y(), inner.Y()].
nscoord distance = DistanceToRange(inner.YMost(), outer.YMost());
if (distance > 0) {
distance -= PositivePart(outer.Y(), inner.Y());
}
topMargin = Some(NSAppUnitsToFloatPixels(
itemBounds.y - scrollPort.y - distance, auPerDevPixel));
// Question: What is the maximum positive ("downward") offset that WR
// will have to apply to this item in order to prevent the item from
// visually moving?
// Answer: Since the item is "sticky" in the range [inner.YMost(),
// outer.YMost()], the maximum offset will be the size of the range, which
// is outer.YMost() - inner.YMost().
vBounds.max =
NSAppUnitsToFloatPixels(outer.YMost() - inner.YMost(), auPerDevPixel);
// Question: how much of an offset has layout already applied to the item?
// Answer: if we are
// (a) inside the sticky range (inner.YMost() < 0 <= outer.YMost()), or
// (b) past the sticky range (inner.YMost() < outer.YMost() < 0)
// then layout has already applied some offset to the position of the
// item. The amount of the adjustment is |0 - inner.YMost()| in case (a)
// and |outer.YMost() - inner.YMost()| in case (b).
if (inner.YMost() < 0) {
appliedOffset.y = std::min(0, outer.YMost()) - inner.YMost();
MOZ_ASSERT(appliedOffset.y > 0);
}
}
if (outer.Y() != inner.Y()) {
// Similar logic as in the previous section, but this time we care about
// the distance from itemBounds.YMost() to scrollPort.YMost().
nscoord distance = DistanceToRange(outer.Y(), inner.Y());
if (distance < 0) {
distance += NegativePart(inner.YMost(), outer.YMost());
}
bottomMargin = Some(NSAppUnitsToFloatPixels(
scrollPort.YMost() - itemBounds.YMost() + distance, auPerDevPixel));
// And here WR will be moving the item upwards rather than downwards so
// again things are inverted from the previous block.
vBounds.min =
NSAppUnitsToFloatPixels(outer.Y() - inner.Y(), auPerDevPixel);
// We can't have appliedOffset be both positive and negative, and the top
// adjustment takes priority. So here we only update appliedOffset.y if
// it wasn't set by the top-sticky case above.
if (appliedOffset.y == 0 && inner.Y() > 0) {
appliedOffset.y = std::max(0, outer.Y()) - inner.Y();
MOZ_ASSERT(appliedOffset.y < 0);
}
}
// Same as above, but for the x-axis
if (outer.XMost() != inner.XMost()) {
nscoord distance = DistanceToRange(inner.XMost(), outer.XMost());
if (distance > 0) {
distance -= PositivePart(outer.X(), inner.X());
}
leftMargin = Some(NSAppUnitsToFloatPixels(
itemBounds.x - scrollPort.x - distance, auPerDevPixel));
hBounds.max =
NSAppUnitsToFloatPixels(outer.XMost() - inner.XMost(), auPerDevPixel);
if (inner.XMost() < 0) {
appliedOffset.x = std::min(0, outer.XMost()) - inner.XMost();
MOZ_ASSERT(appliedOffset.x > 0);
}
}
if (outer.X() != inner.X()) {
nscoord distance = DistanceToRange(outer.X(), inner.X());
if (distance < 0) {
distance += NegativePart(inner.XMost(), outer.XMost());
}
rightMargin = Some(NSAppUnitsToFloatPixels(
scrollPort.XMost() - itemBounds.XMost() + distance, auPerDevPixel));
hBounds.min =
NSAppUnitsToFloatPixels(outer.X() - inner.X(), auPerDevPixel);
if (appliedOffset.x == 0 && inner.X() > 0) {
appliedOffset.x = std::max(0, outer.X()) - inner.X();
MOZ_ASSERT(appliedOffset.x < 0);
}
}
LayoutDeviceRect bounds =
LayoutDeviceRect::FromAppUnits(itemBounds, auPerDevPixel);
wr::LayoutVector2D applied = {
NSAppUnitsToFloatPixels(appliedOffset.x, auPerDevPixel),
NSAppUnitsToFloatPixels(appliedOffset.y, auPerDevPixel)};
wr::WrSpatialId spatialId = aBuilder.DefineStickyFrame(
wr::ToLayoutRect(bounds), topMargin.ptrOr(nullptr),
rightMargin.ptrOr(nullptr), bottomMargin.ptrOr(nullptr),
leftMargin.ptrOr(nullptr), vBounds, hBounds, applied,
wr::SpatialKey(uint64_t(mFrame), GetPerFrameKey(),
wr::SpatialKeyKind::Sticky));
saccHelper.emplace(aBuilder, spatialId);
aManager->CommandBuilder().PushOverrideForASR(mContainerASR, spatialId);
}
{
wr::StackingContextParams params;
params.clip =
wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this,
aBuilder, params);
nsDisplayOwnLayer::CreateWebRenderCommands(aBuilder, aResources, sc,
aManager, aDisplayListBuilder);
}
if (stickyScrollContainer) {
aManager->CommandBuilder().PopOverrideForASR(mContainerASR);
}
return true;
}
void nsDisplayStickyPosition::CalculateLayerScrollRanges(
StickyScrollContainer* aStickyScrollContainer, float aAppUnitsPerDevPixel,
float aScaleX, float aScaleY, LayerRectAbsolute& aStickyOuter,
LayerRectAbsolute& aStickyInner) {
nsRectAbsolute outer;
nsRectAbsolute inner;
aStickyScrollContainer->GetScrollRanges(mFrame, &outer, &inner);
aStickyOuter.SetBox(
NSAppUnitsToFloatPixels(outer.X(), aAppUnitsPerDevPixel) * aScaleX,
NSAppUnitsToFloatPixels(outer.Y(), aAppUnitsPerDevPixel) * aScaleY,
NSAppUnitsToFloatPixels(outer.XMost(), aAppUnitsPerDevPixel) * aScaleX,
NSAppUnitsToFloatPixels(outer.YMost(), aAppUnitsPerDevPixel) * aScaleY);
aStickyInner.SetBox(
NSAppUnitsToFloatPixels(inner.X(), aAppUnitsPerDevPixel) * aScaleX,
NSAppUnitsToFloatPixels(inner.Y(), aAppUnitsPerDevPixel) * aScaleY,
NSAppUnitsToFloatPixels(inner.XMost(), aAppUnitsPerDevPixel) * aScaleX,
NSAppUnitsToFloatPixels(inner.YMost(), aAppUnitsPerDevPixel) * aScaleY);
}
bool nsDisplayStickyPosition::UpdateScrollData(
WebRenderScrollData* aData, WebRenderLayerScrollData* aLayerData) {
bool hasDynamicToolbar = HasDynamicToolbar();
if (aLayerData && hasDynamicToolbar) {
StickyScrollContainer* stickyScrollContainer = GetStickyScrollContainer();
if (stickyScrollContainer) {
float auPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
float cumulativeResolution =
mFrame->PresShell()->GetCumulativeResolution();
LayerRectAbsolute stickyOuter;
LayerRectAbsolute stickyInner;
CalculateLayerScrollRanges(stickyScrollContainer, auPerDevPixel,
cumulativeResolution, cumulativeResolution,
stickyOuter, stickyInner);
aLayerData->SetStickyScrollRangeOuter(stickyOuter);
aLayerData->SetStickyScrollRangeInner(stickyInner);
SideBits sides =
nsLayoutUtils::GetSideBitsForFixedPositionContent(mFrame);
aLayerData->SetFixedPositionSides(sides);
ScrollableLayerGuid::ViewID scrollId =
nsLayoutUtils::FindOrCreateIDFor(stickyScrollContainer->ScrollFrame()
->GetScrolledFrame()
->GetContent());
aLayerData->SetStickyPositionScrollContainerId(scrollId);
}
}
// Return true if either there is a dynamic toolbar affecting this sticky
// item or the OwnLayer base implementation returns true for some other
// reason.
bool ret = hasDynamicToolbar;
ret |= nsDisplayOwnLayer::UpdateScrollData(aData, aLayerData);
return ret;
}
bool nsDisplayStickyPosition::ShouldGetFixedOrStickyAnimationId() {
#if defined(MOZ_WIDGET_ANDROID)
if (HasDynamicToolbar()) { // also implies being in the cross-process RCD
StickyScrollContainer* stickyScrollContainer = GetStickyScrollContainer();
if (stickyScrollContainer) {
ScrollableLayerGuid::ViewID scrollId =
nsLayoutUtils::FindOrCreateIDFor(stickyScrollContainer->ScrollFrame()
->GetScrolledFrame()
->GetContent());
return nsLayoutUtils::ScrollIdForRootScrollFrame(mFrame->PresContext()) ==
scrollId;
}
}
#endif
return false;
}
nsDisplayScrollInfoLayer::nsDisplayScrollInfoLayer(
nsDisplayListBuilder* aBuilder, nsIFrame* aScrolledFrame,
nsIFrame* aScrollFrame, const CompositorHitTestInfo& aHitInfo,
const nsRect& aHitArea)
: nsDisplayWrapList(aBuilder, aScrollFrame),
mScrollFrame(aScrollFrame),
mScrolledFrame(aScrolledFrame),
mScrollParentId(aBuilder->GetCurrentScrollParentId()),
mHitInfo(aHitInfo),
mHitArea(aHitArea) {
#ifdef NS_BUILD_REFCNT_LOGGING
MOZ_COUNT_CTOR(nsDisplayScrollInfoLayer);
#endif
}
UniquePtr<ScrollMetadata> nsDisplayScrollInfoLayer::ComputeScrollMetadata(
nsDisplayListBuilder* aBuilder, WebRenderLayerManager* aLayerManager) {
ScrollMetadata metadata = nsLayoutUtils::ComputeScrollMetadata(
mScrolledFrame, mScrollFrame, mScrollFrame->GetContent(), Frame(),
ToReferenceFrame(), aLayerManager, mScrollParentId,
mScrollFrame->GetSize(), false);
metadata.GetMetrics().SetIsScrollInfoLayer(true);
nsIScrollableFrame* scrollableFrame = mScrollFrame->GetScrollTargetFrame();
if (scrollableFrame) {
aBuilder->AddScrollFrameToNotify(scrollableFrame);
}
return UniquePtr<ScrollMetadata>(new ScrollMetadata(metadata));
}
bool nsDisplayScrollInfoLayer::UpdateScrollData(
WebRenderScrollData* aData, WebRenderLayerScrollData* aLayerData) {
if (aLayerData) {
UniquePtr<ScrollMetadata> metadata =
ComputeScrollMetadata(aData->GetBuilder(), aData->GetManager());
MOZ_ASSERT(aData);
MOZ_ASSERT(metadata);
aLayerData->AppendScrollMetadata(*aData, *metadata);
}
return true;
}
bool nsDisplayScrollInfoLayer::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
ScrollableLayerGuid::ViewID scrollId =
nsLayoutUtils::FindOrCreateIDFor(mScrollFrame->GetContent());
const LayoutDeviceRect devRect = LayoutDeviceRect::FromAppUnits(
mHitArea, mScrollFrame->PresContext()->AppUnitsPerDevPixel());
const wr::LayoutRect rect = wr::ToLayoutRect(devRect);
aBuilder.PushHitTest(rect, rect, !BackfaceIsHidden(), scrollId, mHitInfo,
SideBits::eNone);
return true;
}
void nsDisplayScrollInfoLayer::WriteDebugInfo(std::stringstream& aStream) {
aStream << " (scrollframe " << mScrollFrame << " scrolledFrame "
<< mScrolledFrame << ")";
}
nsDisplayZoom::nsDisplayZoom(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
nsSubDocumentFrame* aSubDocFrame,
nsDisplayList* aList, int32_t aAPD,
int32_t aParentAPD, nsDisplayOwnLayerFlags aFlags)
: nsDisplaySubDocument(aBuilder, aFrame, aSubDocFrame, aList, aFlags),
mAPD(aAPD),
mParentAPD(aParentAPD) {
MOZ_COUNT_CTOR(nsDisplayZoom);
}
nsRect nsDisplayZoom::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
nsRect bounds = nsDisplaySubDocument::GetBounds(aBuilder, aSnap);
*aSnap = false;
return bounds.ScaleToOtherAppUnitsRoundOut(mAPD, mParentAPD);
}
void nsDisplayZoom::HitTest(nsDisplayListBuilder* aBuilder, const nsRect& aRect,
HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
nsRect rect;
// A 1x1 rect indicates we are just hit testing a point, so pass down a 1x1
// rect as well instead of possibly rounding the width or height to zero.
if (aRect.width == 1 && aRect.height == 1) {
rect.MoveTo(aRect.TopLeft().ScaleToOtherAppUnits(mParentAPD, mAPD));
rect.width = rect.height = 1;
} else {
rect = aRect.ScaleToOtherAppUnitsRoundOut(mParentAPD, mAPD);
}
mList.HitTest(aBuilder, rect, aState, aOutFrames);
}
nsDisplayAsyncZoom::nsDisplayAsyncZoom(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aActiveScrolledRoot, FrameMetrics::ViewID aViewID)
: nsDisplayOwnLayer(aBuilder, aFrame, aList, aActiveScrolledRoot),
mViewID(aViewID) {
MOZ_COUNT_CTOR(nsDisplayAsyncZoom);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayAsyncZoom::~nsDisplayAsyncZoom() {
MOZ_COUNT_DTOR(nsDisplayAsyncZoom);
}
#endif
void nsDisplayAsyncZoom::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect, HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
#ifdef DEBUG
nsIScrollableFrame* scrollFrame = do_QueryFrame(mFrame);
MOZ_ASSERT(scrollFrame && ViewportUtils::IsZoomedContentRoot(
scrollFrame->GetScrolledFrame()));
#endif
nsRect rect = ViewportUtils::VisualToLayout(aRect, mFrame->PresShell());
mList.HitTest(aBuilder, rect, aState, aOutFrames);
}
bool nsDisplayAsyncZoom::UpdateScrollData(
WebRenderScrollData* aData, WebRenderLayerScrollData* aLayerData) {
bool ret = nsDisplayOwnLayer::UpdateScrollData(aData, aLayerData);
MOZ_ASSERT(ret);
if (aLayerData) {
aLayerData->SetAsyncZoomContainerId(mViewID);
}
return ret;
}
///////////////////////////////////////////////////
// nsDisplayTransform Implementation
//
#ifndef DEBUG
static_assert(sizeof(nsDisplayTransform) <= 512,
"nsDisplayTransform has grown");
#endif
nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
const nsRect& aChildrenBuildingRect)
: nsPaintedDisplayItem(aBuilder, aFrame),
mChildren(aBuilder),
mTransform(Some(Matrix4x4())),
mChildrenBuildingRect(aChildrenBuildingRect),
mPrerenderDecision(PrerenderDecision::No),
mIsTransformSeparator(true),
mHasTransformGetter(false),
mHasAssociatedPerspective(false),
mContainsASRs(false) {
MOZ_COUNT_CTOR(nsDisplayTransform);
MOZ_ASSERT(aFrame, "Must have a frame!");
Init(aBuilder, aList);
}
nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
const nsRect& aChildrenBuildingRect,
PrerenderDecision aPrerenderDecision)
: nsPaintedDisplayItem(aBuilder, aFrame),
mChildren(aBuilder),
mChildrenBuildingRect(aChildrenBuildingRect),
mPrerenderDecision(aPrerenderDecision),
mIsTransformSeparator(false),
mHasTransformGetter(false),
mHasAssociatedPerspective(false),
mContainsASRs(false) {
MOZ_COUNT_CTOR(nsDisplayTransform);
MOZ_ASSERT(aFrame, "Must have a frame!");
SetReferenceFrameToAncestor(aBuilder);
Init(aBuilder, aList);
}
nsDisplayTransform::nsDisplayTransform(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
const nsRect& aChildrenBuildingRect,
decltype(WithTransformGetter))
: nsPaintedDisplayItem(aBuilder, aFrame),
mChildren(aBuilder),
mChildrenBuildingRect(aChildrenBuildingRect),
mPrerenderDecision(PrerenderDecision::No),
mIsTransformSeparator(false),
mHasTransformGetter(true),
mHasAssociatedPerspective(false),
mContainsASRs(false) {
MOZ_COUNT_CTOR(nsDisplayTransform);
MOZ_ASSERT(aFrame, "Must have a frame!");
MOZ_ASSERT(aFrame->GetTransformGetter());
Init(aBuilder, aList);
}
void nsDisplayTransform::SetReferenceFrameToAncestor(
nsDisplayListBuilder* aBuilder) {
if (mFrame == aBuilder->RootReferenceFrame()) {
return;
}
// We manually recompute mToReferenceFrame without going through the
// builder, since this won't apply the 'additional offset'. Our
// children will already be painting with that applied, and we don't
// want to include it a second time in our transform. We don't recompute
// our visible/building rects, since those should still include the additional
// offset.
// TODO: Are there are things computed using our ToReferenceFrame that should
// have the additional offset applied? Should we instead just manually remove
// the offset from our transform instead of this more general value?
// Can we instead apply the additional offset to us and not our children, like
// we do for all other offsets (and how reference frames are supposed to
// work)?
nsIFrame* outerFrame = nsLayoutUtils::GetCrossDocParentFrameInProcess(mFrame);
const nsIFrame* referenceFrame = aBuilder->FindReferenceFrameFor(outerFrame);
mToReferenceFrame = mFrame->GetOffsetToCrossDoc(referenceFrame);
}
void nsDisplayTransform::Init(nsDisplayListBuilder* aBuilder,
nsDisplayList* aChildren) {
mChildren.AppendToTop(aChildren);
UpdateBounds(aBuilder);
}
bool nsDisplayTransform::ShouldFlattenAway(nsDisplayListBuilder* aBuilder) {
return false;
}
/* Returns the delta specified by the transform-origin property.
* This is a positive delta, meaning that it indicates the direction to move
* to get from (0, 0) of the frame to the transform origin. This function is
* called off the main thread.
*/
/* static */
Point3D nsDisplayTransform::GetDeltaToTransformOrigin(
const nsIFrame* aFrame, TransformReferenceBox& aRefBox,
float aAppUnitsPerPixel) {
MOZ_ASSERT(aFrame, "Can't get delta for a null frame!");
MOZ_ASSERT(aFrame->IsTransformed() || aFrame->BackfaceIsHidden() ||
aFrame->Combines3DTransformWithAncestors(),
"Shouldn't get a delta for an untransformed frame!");
if (!aFrame->IsTransformed()) {
return Point3D();
}
/* For both of the coordinates, if the value of transform is a
* percentage, it's relative to the size of the frame. Otherwise, if it's
* a distance, it's already computed for us!
*/
const nsStyleDisplay* display = aFrame->StyleDisplay();
const StyleTransformOrigin& transformOrigin = display->mTransformOrigin;
CSSPoint origin = nsStyleTransformMatrix::Convert2DPosition(
transformOrigin.horizontal, transformOrigin.vertical, aRefBox);
// Note:
// 1. SVG frames have a reference box that can be (and typically is) offset
// from the TopLeft() of the frame. We need to account for that here.
// 2. If we are using transform-box:content-box in CSS layout, we have the
// offset from TopLeft() of the frame as well.
origin.x += CSSPixel::FromAppUnits(aRefBox.X());
origin.y += CSSPixel::FromAppUnits(aRefBox.Y());
float scale = AppUnitsPerCSSPixel() / float(aAppUnitsPerPixel);
float z = transformOrigin.depth._0;
return Point3D(origin.x * scale, origin.y * scale, z * scale);
}
/* static */
bool nsDisplayTransform::ComputePerspectiveMatrix(const nsIFrame* aFrame,
float aAppUnitsPerPixel,
Matrix4x4& aOutMatrix) {
MOZ_ASSERT(aFrame, "Can't get delta for a null frame!");
MOZ_ASSERT(aFrame->IsTransformed() || aFrame->BackfaceIsHidden() ||
aFrame->Combines3DTransformWithAncestors(),
"Shouldn't get a delta for an untransformed frame!");
MOZ_ASSERT(aOutMatrix.IsIdentity(), "Must have a blank output matrix");
if (!aFrame->IsTransformed()) {
return false;
}
// TODO: Is it possible that the perspectiveFrame's bounds haven't been set
// correctly yet (similar to the aBoundsOverride case for
// GetResultingTransformMatrix)?
nsIFrame* perspectiveFrame =
aFrame->GetClosestFlattenedTreeAncestorPrimaryFrame();
if (!perspectiveFrame) {
return false;
}
/* Grab the values for perspective and perspective-origin (if present) */
const nsStyleDisplay* perspectiveDisplay = perspectiveFrame->StyleDisplay();
if (perspectiveDisplay->mChildPerspective.IsNone()) {
return false;
}
MOZ_ASSERT(perspectiveDisplay->mChildPerspective.IsLength());
float perspective =
perspectiveDisplay->mChildPerspective.AsLength().ToCSSPixels();
perspective = std::max(1.0f, perspective);
if (perspective < std::numeric_limits<Float>::epsilon()) {
return true;
}
TransformReferenceBox refBox(perspectiveFrame);
Point perspectiveOrigin = nsStyleTransformMatrix::Convert2DPosition(
perspectiveDisplay->mPerspectiveOrigin.horizontal,
perspectiveDisplay->mPerspectiveOrigin.vertical, refBox,
aAppUnitsPerPixel);
/* GetOffsetTo computes the offset required to move from 0,0 in
* perspectiveFrame to 0,0 in aFrame. Although we actually want the inverse of
* this, it's faster to compute this way.
*/
nsPoint frameToPerspectiveOffset = -aFrame->GetOffsetTo(perspectiveFrame);
Point frameToPerspectiveGfxOffset(
NSAppUnitsToFloatPixels(frameToPerspectiveOffset.x, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(frameToPerspectiveOffset.y, aAppUnitsPerPixel));
/* Move the perspective origin to be relative to aFrame, instead of relative
* to the containing block which is how it was specified in the style system.
*/
perspectiveOrigin += frameToPerspectiveGfxOffset;
aOutMatrix._34 =
-1.0 / NSAppUnitsToFloatPixels(CSSPixel::ToAppUnits(perspective),
aAppUnitsPerPixel);
aOutMatrix.ChangeBasis(Point3D(perspectiveOrigin.x, perspectiveOrigin.y, 0));
return true;
}
nsDisplayTransform::FrameTransformProperties::FrameTransformProperties(
const nsIFrame* aFrame, TransformReferenceBox& aRefBox,
float aAppUnitsPerPixel)
: mFrame(aFrame),
mTranslate(aFrame->StyleDisplay()->mTranslate),
mRotate(aFrame->StyleDisplay()->mRotate),
mScale(aFrame->StyleDisplay()->mScale),
mTransform(aFrame->StyleDisplay()->mTransform),
mMotion(aFrame->StyleDisplay()->mOffsetPath.IsNone()
? Nothing()
: MotionPathUtils::ResolveMotionPath(aFrame, aRefBox)),
mToTransformOrigin(
GetDeltaToTransformOrigin(aFrame, aRefBox, aAppUnitsPerPixel)) {}
/* Wraps up the transform matrix in a change-of-basis matrix pair that
* translates from local coordinate space to transform coordinate space, then
* hands it back.
*/
Matrix4x4 nsDisplayTransform::GetResultingTransformMatrix(
const FrameTransformProperties& aProperties, TransformReferenceBox& aRefBox,
float aAppUnitsPerPixel) {
return GetResultingTransformMatrixInternal(aProperties, aRefBox, nsPoint(),
aAppUnitsPerPixel, 0);
}
Matrix4x4 nsDisplayTransform::GetResultingTransformMatrix(
const nsIFrame* aFrame, const nsPoint& aOrigin, float aAppUnitsPerPixel,
uint32_t aFlags) {
TransformReferenceBox refBox(aFrame);
FrameTransformProperties props(aFrame, refBox, aAppUnitsPerPixel);
return GetResultingTransformMatrixInternal(props, refBox, aOrigin,
aAppUnitsPerPixel, aFlags);
}
Matrix4x4 nsDisplayTransform::GetResultingTransformMatrixInternal(
const FrameTransformProperties& aProperties, TransformReferenceBox& aRefBox,
const nsPoint& aOrigin, float aAppUnitsPerPixel, uint32_t aFlags) {
const nsIFrame* frame = aProperties.mFrame;
NS_ASSERTION(frame || !(aFlags & INCLUDE_PERSPECTIVE),
"Must have a frame to compute perspective!");
// IncrementScaleRestyleCountIfNeeded in ActiveLayerTracker.cpp is a
// simplified copy of this function.
// Get the underlying transform matrix:
/* Get the matrix, then change its basis to factor in the origin. */
Matrix4x4 result;
// Call IsSVGTransformed() regardless of the value of
// aProperties.HasTransform(), since we still need any
// potential parentsChildrenOnlyTransform.
Matrix svgTransform, parentsChildrenOnlyTransform;
const bool hasSVGTransforms =
frame && frame->HasAnyStateBits(NS_FRAME_MAY_BE_TRANSFORMED) &&
frame->IsSVGTransformed(&svgTransform, &parentsChildrenOnlyTransform);
bool shouldRound = nsLayoutUtils::ShouldSnapToGrid(frame);
/* Transformed frames always have a transform, or are preserving 3d (and might
* still have perspective!) */
if (aProperties.HasTransform()) {
result = nsStyleTransformMatrix::ReadTransforms(
aProperties.mTranslate, aProperties.mRotate, aProperties.mScale,
aProperties.mMotion.ptrOr(nullptr), aProperties.mTransform, aRefBox,
aAppUnitsPerPixel);
} else if (hasSVGTransforms) {
// Correct the translation components for zoom:
float pixelsPerCSSPx = AppUnitsPerCSSPixel() / aAppUnitsPerPixel;
svgTransform._31 *= pixelsPerCSSPx;
svgTransform._32 *= pixelsPerCSSPx;
result = Matrix4x4::From2D(svgTransform);
}
// Apply any translation due to 'transform-origin' and/or 'transform-box':
result.ChangeBasis(aProperties.mToTransformOrigin);
// See the comment for SVGContainerFrame::HasChildrenOnlyTransform for
// an explanation of what children-only transforms are.
const bool parentHasChildrenOnlyTransform =
hasSVGTransforms && !parentsChildrenOnlyTransform.IsIdentity();
if (parentHasChildrenOnlyTransform) {
float pixelsPerCSSPx = AppUnitsPerCSSPixel() / aAppUnitsPerPixel;
parentsChildrenOnlyTransform._31 *= pixelsPerCSSPx;
parentsChildrenOnlyTransform._32 *= pixelsPerCSSPx;
Point3D frameOffset(
NSAppUnitsToFloatPixels(-frame->GetPosition().x, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(-frame->GetPosition().y, aAppUnitsPerPixel), 0);
Matrix4x4 parentsChildrenOnlyTransform3D =
Matrix4x4::From2D(parentsChildrenOnlyTransform)
.ChangeBasis(frameOffset);
result *= parentsChildrenOnlyTransform3D;
}
Matrix4x4 perspectiveMatrix;
bool hasPerspective = aFlags & INCLUDE_PERSPECTIVE;
if (hasPerspective) {
if (ComputePerspectiveMatrix(frame, aAppUnitsPerPixel, perspectiveMatrix)) {
result *= perspectiveMatrix;
}
}
if ((aFlags & INCLUDE_PRESERVE3D_ANCESTORS) && frame &&
frame->Combines3DTransformWithAncestors()) {
// Include the transform set on our parent
nsIFrame* parentFrame =
frame->GetClosestFlattenedTreeAncestorPrimaryFrame();
NS_ASSERTION(parentFrame && parentFrame->IsTransformed() &&
parentFrame->Extend3DContext(),
"Preserve3D mismatch!");
TransformReferenceBox refBox(parentFrame);
FrameTransformProperties props(parentFrame, refBox, aAppUnitsPerPixel);
uint32_t flags =
aFlags & (INCLUDE_PRESERVE3D_ANCESTORS | INCLUDE_PERSPECTIVE);
// If this frame isn't transformed (but we exist for backface-visibility),
// then we're not a reference frame so no offset to origin will be added.
// Otherwise we need to manually translate into our parent's coordinate
// space.
if (frame->IsTransformed()) {
nsLayoutUtils::PostTranslate(result, frame->GetPosition(),
aAppUnitsPerPixel, shouldRound);
}
Matrix4x4 parent = GetResultingTransformMatrixInternal(
props, refBox, nsPoint(0, 0), aAppUnitsPerPixel, flags);
result = result * parent;
}
if (aFlags & OFFSET_BY_ORIGIN) {
nsLayoutUtils::PostTranslate(result, aOrigin, aAppUnitsPerPixel,
shouldRound);
}
return result;
}
bool nsDisplayOpacity::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder) {
static constexpr nsCSSPropertyIDSet opacitySet =
nsCSSPropertyIDSet::OpacityProperties();
if (ActiveLayerTracker::IsStyleAnimated(aBuilder, mFrame, opacitySet)) {
return true;
}
EffectCompositor::SetPerformanceWarning(
mFrame, opacitySet,
AnimationPerformanceWarning(
AnimationPerformanceWarning::Type::OpacityFrameInactive));
return false;
}
bool nsDisplayTransform::CanUseAsyncAnimations(nsDisplayListBuilder* aBuilder) {
return mPrerenderDecision != PrerenderDecision::No;
}
bool nsDisplayBackgroundColor::CanUseAsyncAnimations(
nsDisplayListBuilder* aBuilder) {
return StaticPrefs::gfx_omta_background_color();
}
static bool IsInStickyPositionedSubtree(const nsIFrame* aFrame) {
for (const nsIFrame* frame = aFrame; frame;
frame = nsLayoutUtils::GetCrossDocParentFrameInProcess(frame)) {
if (frame->IsStickyPositioned()) {
return true;
}
}
return false;
}
static bool ShouldUsePartialPrerender(const nsIFrame* aFrame) {
return StaticPrefs::layout_animation_prerender_partial() &&
!IsInStickyPositionedSubtree(aFrame);
}
/* static */
auto nsDisplayTransform::ShouldPrerenderTransformedContent(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsRect* aDirtyRect)
-> PrerenderInfo {
PrerenderInfo result;
// If we are in a preserve-3d tree, and we've disallowed async animations, we
// return No prerender decision directly.
if ((aFrame->Extend3DContext() ||
aFrame->Combines3DTransformWithAncestors()) &&
!aBuilder->GetPreserves3DAllowAsyncAnimation()) {
return result;
}
// Elements whose transform has been modified recently, or which
// have a compositor-animated transform, can be prerendered. An element
// might have only just had its transform animated in which case
// the ActiveLayerManager may not have been notified yet.
static constexpr nsCSSPropertyIDSet transformSet =
nsCSSPropertyIDSet::TransformLikeProperties();
if (!ActiveLayerTracker::IsTransformMaybeAnimated(aFrame) &&
!EffectCompositor::HasAnimationsForCompositor(
aFrame, DisplayItemType::TYPE_TRANSFORM)) {
EffectCompositor::SetPerformanceWarning(
aFrame, transformSet,
AnimationPerformanceWarning(
AnimationPerformanceWarning::Type::TransformFrameInactive));
// This case happens when we're sure that the frame is not animated and its
// preserve-3d ancestors are not, either. So we don't need to pre-render.
// However, this decision shouldn't affect the decisions for other frames in
// the preserve-3d context. We need this flag to determine whether we should
// block async animations on other frames in the current preserve-3d tree.
result.mHasAnimations = false;
return result;
}
// We should not allow prerender if any ancestor container element has
// mask/clip-path effects.
//
// With prerender and async transform animation, we do not need to restyle an
// animated element to respect position changes, since that transform is done
// by layer animation. As a result, the container element is not aware of
// position change of that containing element and loses the chance to update
// the content of mask/clip-path.
//
// Why do we need to update a mask? This is relative to how we generate a
// mask layer in ContainerState::SetupMaskLayerForCSSMask. While creating a
// mask layer, to reduce memory usage, we did not choose the size of the
// masked element as mask size. Instead, we read the union of bounds of all
// children display items by nsDisplayWrapList::GetBounds, which is smaller
// than or equal to the masked element's boundary, and use it as the position
// size of the mask layer. That union bounds is actually affected by the
// geometry of the animated element. To keep the content of mask up to date,
// forbidding of prerender is required.
for (nsIFrame* container =
nsLayoutUtils::GetCrossDocParentFrameInProcess(aFrame);
container;
container = nsLayoutUtils::GetCrossDocParentFrameInProcess(container)) {
const nsStyleSVGReset* svgReset = container->StyleSVGReset();
if (svgReset->HasMask() || svgReset->HasClipPath()) {
return result;
}
}
// If the incoming dirty rect already contains the entire overflow area,
// we are already rendering the entire content.
nsRect overflow = aFrame->InkOverflowRectRelativeToSelf();
// UntransformRect will not touch the output rect (`&untranformedDirtyRect`)
// in cases of non-invertible transforms, so we set `untransformedRect` to
// `aDirtyRect` as an initial value for such cases.
nsRect untransformedDirtyRect = *aDirtyRect;
UntransformRect(*aDirtyRect, overflow, aFrame, &untransformedDirtyRect);
if (untransformedDirtyRect.Contains(overflow)) {
*aDirtyRect = untransformedDirtyRect;
result.mDecision = PrerenderDecision::Full;
return result;
}
float viewportRatio =
StaticPrefs::layout_animation_prerender_viewport_ratio_limit();
uint32_t absoluteLimitX =
StaticPrefs::layout_animation_prerender_absolute_limit_x();
uint32_t absoluteLimitY =
StaticPrefs::layout_animation_prerender_absolute_limit_y();
nsSize refSize = aBuilder->RootReferenceFrame()->GetSize();
float resolution = aFrame->PresShell()->GetCumulativeResolution();
if (resolution < 1.0f) {
refSize.SizeTo(
NSCoordSaturatingNonnegativeMultiply(refSize.width, 1.0f / resolution),
NSCoordSaturatingNonnegativeMultiply(refSize.height,
1.0f / resolution));
}
// Only prerender if the transformed frame's size is <= a multiple of the
// reference frame size (~viewport), and less than an absolute limit.
// Both the ratio and the absolute limit are configurable.
nscoord maxLength = std::max(nscoord(refSize.width * viewportRatio),
nscoord(refSize.height * viewportRatio));
nsSize relativeLimit(maxLength, maxLength);
nsSize absoluteLimit(
aFrame->PresContext()->DevPixelsToAppUnits(absoluteLimitX),
aFrame->PresContext()->DevPixelsToAppUnits(absoluteLimitY));
nsSize maxSize = Min(relativeLimit, absoluteLimit);
const auto transform = nsLayoutUtils::GetTransformToAncestor(
RelativeTo{aFrame},
RelativeTo{nsLayoutUtils::GetDisplayRootFrame(aFrame)});
const gfxRect transformedBounds = transform.TransformAndClipBounds(
gfxRect(overflow.x, overflow.y, overflow.width, overflow.height),
gfxRect::MaxIntRect());
const nsSize frameSize =
nsSize(transformedBounds.width, transformedBounds.height);
uint64_t maxLimitArea = uint64_t(maxSize.width) * maxSize.height;
uint64_t frameArea = uint64_t(frameSize.width) * frameSize.height;
if (frameArea <= maxLimitArea && frameSize <= absoluteLimit) {
*aDirtyRect = overflow;
result.mDecision = PrerenderDecision::Full;
return result;
}
if (ShouldUsePartialPrerender(aFrame)) {
*aDirtyRect = nsLayoutUtils::ComputePartialPrerenderArea(
aFrame, untransformedDirtyRect, overflow, maxSize);
result.mDecision = PrerenderDecision::Partial;
return result;
}
if (frameArea > maxLimitArea) {
uint64_t appUnitsPerPixel = AppUnitsPerCSSPixel();
EffectCompositor::SetPerformanceWarning(
aFrame, transformSet,
AnimationPerformanceWarning(
AnimationPerformanceWarning::Type::ContentTooLargeArea,
{
int(frameArea / (appUnitsPerPixel * appUnitsPerPixel)),
int(maxLimitArea / (appUnitsPerPixel * appUnitsPerPixel)),
}));
} else {
EffectCompositor::SetPerformanceWarning(
aFrame, transformSet,
AnimationPerformanceWarning(
AnimationPerformanceWarning::Type::ContentTooLarge,
{
nsPresContext::AppUnitsToIntCSSPixels(frameSize.width),
nsPresContext::AppUnitsToIntCSSPixels(frameSize.height),
nsPresContext::AppUnitsToIntCSSPixels(relativeLimit.width),
nsPresContext::AppUnitsToIntCSSPixels(relativeLimit.height),
nsPresContext::AppUnitsToIntCSSPixels(absoluteLimit.width),
nsPresContext::AppUnitsToIntCSSPixels(absoluteLimit.height),
}));
}
return result;
}
/* If the matrix is singular, or a hidden backface is shown, the frame won't be
* visible or hit. */
static bool IsFrameVisible(nsIFrame* aFrame, const Matrix4x4& aMatrix) {
if (aMatrix.IsSingular()) {
return false;
}
if (aFrame->BackfaceIsHidden() && aMatrix.IsBackfaceVisible()) {
return false;
}
return true;
}
const Matrix4x4Flagged& nsDisplayTransform::GetTransform() const {
if (mTransform) {
return *mTransform;
}
float scale = mFrame->PresContext()->AppUnitsPerDevPixel();
if (mHasTransformGetter) {
mTransform.emplace((mFrame->GetTransformGetter())(mFrame, scale));
Point3D newOrigin =
Point3D(NSAppUnitsToFloatPixels(mToReferenceFrame.x, scale),
NSAppUnitsToFloatPixels(mToReferenceFrame.y, scale), 0.0f);
mTransform->ChangeBasis(newOrigin.x, newOrigin.y, newOrigin.z);
} else if (!mIsTransformSeparator) {
DebugOnly<bool> isReference = mFrame->IsTransformed() ||
mFrame->Combines3DTransformWithAncestors() ||
mFrame->Extend3DContext();
MOZ_ASSERT(isReference);
mTransform.emplace(
GetResultingTransformMatrix(mFrame, ToReferenceFrame(), scale,
INCLUDE_PERSPECTIVE | OFFSET_BY_ORIGIN));
} else {
// Use identity matrix
mTransform.emplace();
}
return *mTransform;
}
const Matrix4x4Flagged& nsDisplayTransform::GetInverseTransform() const {
if (mInverseTransform) {
return *mInverseTransform;
}
MOZ_ASSERT(!GetTransform().IsSingular());
mInverseTransform.emplace(GetTransform().Inverse());
return *mInverseTransform;
}
Matrix4x4 nsDisplayTransform::GetTransformForRendering(
LayoutDevicePoint* aOutOrigin) const {
if (!mFrame->HasPerspective() || mHasTransformGetter ||
mIsTransformSeparator) {
if (!mHasTransformGetter && !mIsTransformSeparator && aOutOrigin) {
// If aOutOrigin is provided, put the offset to origin into it, because
// we need to keep it separate for webrender. The combination of
// *aOutOrigin and the returned matrix here should always be equivalent
// to what GetTransform() would have returned.
float scale = mFrame->PresContext()->AppUnitsPerDevPixel();
*aOutOrigin = LayoutDevicePoint::FromAppUnits(ToReferenceFrame(), scale);
// The rounding behavior should also be the same as GetTransform().
if (nsLayoutUtils::ShouldSnapToGrid(mFrame)) {
aOutOrigin->Round();
}
return GetResultingTransformMatrix(mFrame, nsPoint(0, 0), scale,
INCLUDE_PERSPECTIVE);
}
return GetTransform().GetMatrix();
}
MOZ_ASSERT(!mHasTransformGetter);
float scale = mFrame->PresContext()->AppUnitsPerDevPixel();
// Don't include perspective transform, or the offset to origin, since
// nsDisplayPerspective will handle both of those.
return GetResultingTransformMatrix(mFrame, ToReferenceFrame(), scale, 0);
}
const Matrix4x4& nsDisplayTransform::GetAccumulatedPreserved3DTransform(
nsDisplayListBuilder* aBuilder) {
MOZ_ASSERT(!mFrame->Extend3DContext() || IsLeafOf3DContext());
if (!IsLeafOf3DContext()) {
return GetTransform().GetMatrix();
}
if (!mTransformPreserves3D) {
const nsIFrame* establisher; // Establisher of the 3D rendering context.
for (establisher = mFrame;
establisher && establisher->Combines3DTransformWithAncestors();
establisher =
establisher->GetClosestFlattenedTreeAncestorPrimaryFrame()) {
}
const nsIFrame* establisherReference = aBuilder->FindReferenceFrameFor(
nsLayoutUtils::GetCrossDocParentFrameInProcess(establisher));
nsPoint offset = establisher->GetOffsetToCrossDoc(establisherReference);
float scale = mFrame->PresContext()->AppUnitsPerDevPixel();
uint32_t flags =
INCLUDE_PRESERVE3D_ANCESTORS | INCLUDE_PERSPECTIVE | OFFSET_BY_ORIGIN;
mTransformPreserves3D = MakeUnique<Matrix4x4>(
GetResultingTransformMatrix(mFrame, offset, scale, flags));
}
return *mTransformPreserves3D;
}
bool nsDisplayTransform::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
// We want to make sure we don't pollute the transform property in the WR
// stacking context by including the position of this frame (relative to the
// parent reference frame). We need to keep those separate; the position of
// this frame goes into the stacking context bounds while the transform goes
// into the transform.
LayoutDevicePoint position;
Matrix4x4 newTransformMatrix = GetTransformForRendering(&position);
gfx::Matrix4x4* transformForSC = &newTransformMatrix;
if (newTransformMatrix.IsIdentity()) {
// If the transform is an identity transform, strip it out so that WR
// doesn't turn this stacking context into a reference frame, as it
transformForSC = nullptr;
// In ChooseScaleAndSetTransform, we round the offset from the reference
// frame used to adjust the transform, if there is no transform, or it
// is just a translation. We need to do the same here.
if (nsLayoutUtils::ShouldSnapToGrid(mFrame)) {
position.Round();
}
}
auto key = wr::SpatialKey(uint64_t(mFrame), GetPerFrameKey(),
wr::SpatialKeyKind::Transform);
// We don't send animations for transform separator display items.
uint64_t animationsId =
mIsTransformSeparator
? 0
: AddAnimationsForWebRender(
this, aManager, aDisplayListBuilder,
IsPartialPrerender() ? Some(position) : Nothing());
wr::WrAnimationProperty prop{wr::WrAnimationType::Transform, animationsId,
key};
nsDisplayTransform* deferredTransformItem = nullptr;
if (ShouldDeferTransform()) {
// If it has perspective, we create a new scroll data via the
// UpdateScrollData call because that scenario is more complex. Otherwise,
// if we don't contain any ASRs then just stash the transform on the
// StackingContextHelper and apply it to any scroll data that are created
// inside this nsDisplayTransform.
deferredTransformItem = this;
}
// Determine if we're possibly animated (= would need an active layer in FLB).
bool animated = !mIsTransformSeparator &&
ActiveLayerTracker::IsTransformMaybeAnimated(Frame());
wr::StackingContextParams params;
params.mBoundTransform = &newTransformMatrix;
params.animation = animationsId ? &prop : nullptr;
wr::WrTransformInfo transform_info;
if (transformForSC) {
transform_info.transform = wr::ToLayoutTransform(newTransformMatrix);
transform_info.key = key;
params.mTransformPtr = &transform_info;
} else {
params.mTransformPtr = nullptr;
}
params.prim_flags = !BackfaceIsHidden()
? wr::PrimitiveFlags::IS_BACKFACE_VISIBLE
: wr::PrimitiveFlags{0};
params.paired_with_perspective = mHasAssociatedPerspective;
params.mDeferredTransformItem = deferredTransformItem;
params.mAnimated = animated;
// Determine if we would have to rasterize any items in local raster space
// (i.e. disable subpixel AA). We don't always need to rasterize locally even
// if the stacking context is possibly animated (at the cost of potentially
// some false negatives with respect to will-change handling), so we pass in
// this determination separately to accurately match with when FLB would
// normally disable subpixel AA.
params.mRasterizeLocally = animated && Frame()->HasAnimationOfTransform();
params.SetPreserve3D(mFrame->Extend3DContext() && !mIsTransformSeparator);
params.clip =
wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
LayoutDeviceSize boundsSize = LayoutDeviceSize::FromAppUnits(
mChildBounds.Size(), mFrame->PresContext()->AppUnitsPerDevPixel());
StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
params, LayoutDeviceRect(position, boundsSize));
aManager->CommandBuilder().CreateWebRenderCommandsFromDisplayList(
GetChildren(), this, aDisplayListBuilder, sc, aBuilder, aResources);
return true;
}
bool nsDisplayTransform::UpdateScrollData(
WebRenderScrollData* aData, WebRenderLayerScrollData* aLayerData) {
if (ShouldDeferTransform()) {
// This case is handled in CreateWebRenderCommands by stashing the transform
// on the stacking context.
return false;
}
if (aLayerData) {
aLayerData->SetTransform(GetTransform().GetMatrix());
aLayerData->SetTransformIsPerspective(mFrame->ChildrenHavePerspective());
}
return true;
}
bool nsDisplayTransform::ShouldSkipTransform(
nsDisplayListBuilder* aBuilder) const {
return (aBuilder->RootReferenceFrame() == mFrame) &&
aBuilder->IsForGenerateGlyphMask();
}
void nsDisplayTransform::Collect3DTransformLeaves(
nsDisplayListBuilder* aBuilder, nsTArray<nsDisplayTransform*>& aLeaves) {
if (!IsParticipating3DContext() || IsLeafOf3DContext()) {
aLeaves.AppendElement(this);
return;
}
FlattenedDisplayListIterator iter(aBuilder, &mChildren);
while (iter.HasNext()) {
nsDisplayItem* item = iter.GetNextItem();
if (item->GetType() == DisplayItemType::TYPE_PERSPECTIVE) {
auto* perspective = static_cast<nsDisplayPerspective*>(item);
if (!perspective->GetChildren()->GetTop()) {
continue;
}
item = perspective->GetChildren()->GetTop();
}
if (item->GetType() != DisplayItemType::TYPE_TRANSFORM) {
gfxCriticalError() << "Invalid child item within 3D transform of type: "
<< item->Name();
continue;
}
static_cast<nsDisplayTransform*>(item)->Collect3DTransformLeaves(aBuilder,
aLeaves);
}
}
static RefPtr<gfx::Path> BuildPathFromPolygon(const RefPtr<DrawTarget>& aDT,
const gfx::Polygon& aPolygon) {
MOZ_ASSERT(!aPolygon.IsEmpty());
RefPtr<PathBuilder> pathBuilder = aDT->CreatePathBuilder();
const nsTArray<Point4D>& points = aPolygon.GetPoints();
pathBuilder->MoveTo(points[0].As2DPoint());
for (size_t i = 1; i < points.Length(); ++i) {
pathBuilder->LineTo(points[i].As2DPoint());
}
pathBuilder->Close();
return pathBuilder->Finish();
}
void nsDisplayTransform::CollectSorted3DTransformLeaves(
nsDisplayListBuilder* aBuilder, nsTArray<TransformPolygon>& aLeaves) {
std::list<TransformPolygon> inputLayers;
nsTArray<nsDisplayTransform*> leaves;
Collect3DTransformLeaves(aBuilder, leaves);
for (nsDisplayTransform* item : leaves) {
auto bounds = LayoutDeviceRect::FromAppUnits(
item->mChildBounds, item->mFrame->PresContext()->AppUnitsPerDevPixel());
Matrix4x4 transform = item->GetAccumulatedPreserved3DTransform(aBuilder);
if (!IsFrameVisible(item->mFrame, transform)) {
continue;
}
gfx::Polygon polygon =
gfx::Polygon::FromRect(gfx::Rect(bounds.ToUnknownRect()));
polygon.TransformToScreenSpace(transform);
if (polygon.GetPoints().Length() >= 3) {
inputLayers.push_back(TransformPolygon(item, std::move(polygon)));
}
}
if (inputLayers.empty()) {
return;
}
BSPTree<nsDisplayTransform> tree(inputLayers);
nsTArray<TransformPolygon> orderedLayers(tree.GetDrawOrder());
for (TransformPolygon& polygon : orderedLayers) {
Matrix4x4 inverse =
polygon.data->GetAccumulatedPreserved3DTransform(aBuilder).Inverse();
MOZ_ASSERT(polygon.geometry);
polygon.geometry->TransformToLayerSpace(inverse);
}
aLeaves = std::move(orderedLayers);
}
void nsDisplayTransform::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
Paint(aBuilder, aCtx, Nothing());
}
void nsDisplayTransform::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx,
const Maybe<gfx::Polygon>& aPolygon) {
if (IsParticipating3DContext() && !IsLeafOf3DContext()) {
MOZ_ASSERT(!aPolygon);
nsTArray<TransformPolygon> leaves;
CollectSorted3DTransformLeaves(aBuilder, leaves);
for (TransformPolygon& item : leaves) {
item.data->Paint(aBuilder, aCtx, item.geometry);
}
return;
}
gfxContextMatrixAutoSaveRestore saveMatrix(aCtx);
Matrix4x4 trans = ShouldSkipTransform(aBuilder)
? Matrix4x4()
: GetAccumulatedPreserved3DTransform(aBuilder);
if (!IsFrameVisible(mFrame, trans)) {
return;
}
Matrix trans2d;
if (trans.CanDraw2D(&trans2d)) {
aCtx->Multiply(ThebesMatrix(trans2d));
if (aPolygon) {
RefPtr<gfx::Path> path =
BuildPathFromPolygon(aCtx->GetDrawTarget(), *aPolygon);
aCtx->GetDrawTarget()->PushClip(path);
}
GetChildren()->Paint(aBuilder, aCtx,
mFrame->PresContext()->AppUnitsPerDevPixel());
if (aPolygon) {
aCtx->GetDrawTarget()->PopClip();
}
return;
}
// TODO: Implement 3d transform handling, including plane splitting and
// sorting. See BasicCompositor.
auto pixelBounds = LayoutDeviceRect::FromAppUnitsToOutside(
mChildBounds, mFrame->PresContext()->AppUnitsPerDevPixel());
RefPtr<DrawTarget> untransformedDT =
gfxPlatform::GetPlatform()->CreateOffscreenContentDrawTarget(
IntSize(pixelBounds.Width(), pixelBounds.Height()),
SurfaceFormat::B8G8R8A8, true);
if (!untransformedDT || !untransformedDT->IsValid()) {
return;
}
untransformedDT->SetTransform(
Matrix::Translation(-Point(pixelBounds.X(), pixelBounds.Y())));
gfxContext groupTarget(untransformedDT, /* aPreserveTransform */ true);
if (aPolygon) {
RefPtr<gfx::Path> path =
BuildPathFromPolygon(aCtx->GetDrawTarget(), *aPolygon);
aCtx->GetDrawTarget()->PushClip(path);
}
GetChildren()->Paint(aBuilder, &groupTarget,
mFrame->PresContext()->AppUnitsPerDevPixel());
if (aPolygon) {
aCtx->GetDrawTarget()->PopClip();
}
RefPtr<SourceSurface> untransformedSurf = untransformedDT->Snapshot();
trans.PreTranslate(pixelBounds.X(), pixelBounds.Y(), 0);
aCtx->GetDrawTarget()->Draw3DTransformedSurface(untransformedSurf, trans);
}
bool nsDisplayTransform::MayBeAnimated(nsDisplayListBuilder* aBuilder) const {
// If EffectCompositor::HasAnimationsForCompositor() is true then we can
// completely bypass the main thread for this animation, so it is always
// worthwhile.
// For ActiveLayerTracker::IsTransformAnimated() cases the main thread is
// already involved so there is less to be gained.
// Therefore we check that the *post-transform* bounds of this item are
// big enough to justify an active layer.
return EffectCompositor::HasAnimationsForCompositor(
mFrame, DisplayItemType::TYPE_TRANSFORM) ||
(ActiveLayerTracker::IsTransformAnimated(aBuilder, mFrame));
}
nsRect nsDisplayTransform::TransformUntransformedBounds(
nsDisplayListBuilder* aBuilder, const Matrix4x4Flagged& aMatrix) const {
bool snap;
const nsRect untransformedBounds = GetUntransformedBounds(aBuilder, &snap);
// GetTransform always operates in dev pixels.
const float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
return nsLayoutUtils::MatrixTransformRect(untransformedBounds, aMatrix,
factor);
}
/**
* Returns the bounds for this transform. The bounds are calculated during
* display list building and merging, see |nsDisplayTransform::UpdateBounds()|.
*/
nsRect nsDisplayTransform::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = false;
return mBounds;
}
void nsDisplayTransform::ComputeBounds(nsDisplayListBuilder* aBuilder) {
MOZ_ASSERT(mFrame->Extend3DContext() || IsLeafOf3DContext());
/* Some transforms can get empty bounds in 2D, but might get transformed again
* and get non-empty bounds. A simple example of this would be a 180 degree
* rotation getting applied twice.
* We should not depend on transforming bounds level by level.
*
* This function collects the bounds of this transform and stores it in
* nsDisplayListBuilder. If this is not a leaf of a 3D context, we recurse
* down and include the bounds of the child transforms.
* The bounds are transformed with the accumulated transformation matrix up to
* the 3D context root coordinate space.
*/
nsDisplayListBuilder::AutoAccumulateTransform accTransform(aBuilder);
accTransform.Accumulate(GetTransform().GetMatrix());
// Do not dive into another 3D context.
if (!IsLeafOf3DContext()) {
for (nsDisplayItem* i : *GetChildren()) {
i->DoUpdateBoundsPreserves3D(aBuilder);
}
}
/* The child transforms that extend 3D context further will have empty bounds,
* so the untransformed bounds here is the bounds of all the non-preserve-3d
* content under this transform.
*/
const nsRect rect = TransformUntransformedBounds(
aBuilder, accTransform.GetCurrentTransform());
aBuilder->AccumulateRect(rect);
}
void nsDisplayTransform::DoUpdateBoundsPreserves3D(
nsDisplayListBuilder* aBuilder) {
MOZ_ASSERT(mFrame->Combines3DTransformWithAncestors() ||
IsTransformSeparator());
// Updating is not going through to child 3D context.
ComputeBounds(aBuilder);
}
void nsDisplayTransform::UpdateBounds(nsDisplayListBuilder* aBuilder) {
UpdateUntransformedBounds(aBuilder);
if (IsTransformSeparator()) {
MOZ_ASSERT(GetTransform().IsIdentity());
mBounds = mChildBounds;
return;
}
if (mFrame->Extend3DContext()) {
if (!Combines3DTransformWithAncestors()) {
// The transform establishes a 3D context. |UpdateBoundsFor3D()| will
// collect the bounds from the child transforms.
UpdateBoundsFor3D(aBuilder);
} else {
// With nested 3D transforms, the 2D bounds might not be useful.
mBounds = nsRect();
}
return;
}
MOZ_ASSERT(!mFrame->Extend3DContext());
// We would like to avoid calculating 2D bounds here for nested 3D transforms,
// A stand-alone transform.
mBounds = TransformUntransformedBounds(aBuilder, GetTransform());
}
void nsDisplayTransform::UpdateBoundsFor3D(nsDisplayListBuilder* aBuilder) {
MOZ_ASSERT(mFrame->Extend3DContext() &&
!mFrame->Combines3DTransformWithAncestors() &&
!IsTransformSeparator());
// Always start updating from an establisher of a 3D rendering context.
nsDisplayListBuilder::AutoAccumulateRect accRect(aBuilder);
nsDisplayListBuilder::AutoAccumulateTransform accTransform(aBuilder);
accTransform.StartRoot();
ComputeBounds(aBuilder);
mBounds = aBuilder->GetAccumulatedRect();
}
void nsDisplayTransform::UpdateUntransformedBounds(
nsDisplayListBuilder* aBuilder) {
mChildBounds = GetChildren()->GetClippedBoundsWithRespectToASR(
aBuilder, mActiveScrolledRoot);
}
#ifdef DEBUG_HIT
# include <time.h>
#endif
/* HitTest does some fun stuff with matrix transforms to obtain the answer. */
void nsDisplayTransform::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect, HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
if (aState->mInPreserves3D) {
GetChildren()->HitTest(aBuilder, aRect, aState, aOutFrames);
return;
}
/* Here's how this works:
* 1. Get the matrix. If it's singular, abort (clearly we didn't hit
* anything).
* 2. Invert the matrix.
* 3. Use it to transform the rect into the correct space.
* 4. Pass that rect down through to the list's version of HitTest.
*/
// GetTransform always operates in dev pixels.
float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
Matrix4x4 matrix = GetAccumulatedPreserved3DTransform(aBuilder);
if (!IsFrameVisible(mFrame, matrix)) {
return;
}
const bool oldHitOccludingItem = aState->mHitOccludingItem;
/* We want to go from transformed-space to regular space.
* Thus we have to invert the matrix, which normally does
* the reverse operation (e.g. regular->transformed)
*/
/* Now, apply the transform and pass it down the channel. */
matrix.Invert();
nsRect resultingRect;
// Magic width/height indicating we're hit testing a point, not a rect
const bool testingPoint = aRect.width == 1 && aRect.height == 1;
if (testingPoint) {
Point4D point =
matrix.ProjectPoint(Point(NSAppUnitsToFloatPixels(aRect.x, factor),
NSAppUnitsToFloatPixels(aRect.y, factor)));
if (!point.HasPositiveWCoord()) {
return;
}
Point point2d = point.As2DPoint();
resultingRect =
nsRect(NSFloatPixelsToAppUnits(float(point2d.x), factor),
NSFloatPixelsToAppUnits(float(point2d.y), factor), 1, 1);
} else {
Rect originalRect(NSAppUnitsToFloatPixels(aRect.x, factor),
NSAppUnitsToFloatPixels(aRect.y, factor),
NSAppUnitsToFloatPixels(aRect.width, factor),
NSAppUnitsToFloatPixels(aRect.height, factor));
Rect childGfxBounds(NSAppUnitsToFloatPixels(mChildBounds.x, factor),
NSAppUnitsToFloatPixels(mChildBounds.y, factor),
NSAppUnitsToFloatPixels(mChildBounds.width, factor),
NSAppUnitsToFloatPixels(mChildBounds.height, factor));
Rect rect = matrix.ProjectRectBounds(originalRect, childGfxBounds);
resultingRect =
nsRect(NSFloatPixelsToAppUnits(float(rect.X()), factor),
NSFloatPixelsToAppUnits(float(rect.Y()), factor),
NSFloatPixelsToAppUnits(float(rect.Width()), factor),
NSFloatPixelsToAppUnits(float(rect.Height()), factor));
}
if (resultingRect.IsEmpty()) {
return;
}
#ifdef DEBUG_HIT
printf("Frame: %p\n", dynamic_cast<void*>(mFrame));
printf(" Untransformed point: (%f, %f)\n", resultingRect.X(),
resultingRect.Y());
uint32_t originalFrameCount = aOutFrames.Length();
#endif
GetChildren()->HitTest(aBuilder, resultingRect, aState, aOutFrames);
if (aState->mHitOccludingItem && !testingPoint &&
!mChildBounds.Contains(aRect)) {
MOZ_ASSERT(aBuilder->HitTestIsForVisibility());
// We're hit-testing a rect that's bigger than our child bounds, but
// resultingRect is clipped by our bounds (in ProjectRectBounds above), so
// we can't stop hit-testing altogether.
//
// FIXME(emilio): I think this means that theoretically we might include
// some frames fully behind other transformed-but-opaque frames? Then again
// that's our pre-existing behavior for other untransformed content that
// doesn't fill the whole rect. To be fully correct I think we'd need proper
// "known occluded region" tracking, but that might be overkill for our
// purposes here.
aState->mHitOccludingItem = oldHitOccludingItem;
}
#ifdef DEBUG_HIT
if (originalFrameCount != aOutFrames.Length())
printf(" Hit! Time: %f, first frame: %p\n", static_cast<double>(clock()),
dynamic_cast<void*>(aOutFrames.ElementAt(0)));
printf("=== end of hit test ===\n");
#endif
}
float nsDisplayTransform::GetHitDepthAtPoint(nsDisplayListBuilder* aBuilder,
const nsPoint& aPoint) {
// GetTransform always operates in dev pixels.
float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
Matrix4x4 matrix = GetAccumulatedPreserved3DTransform(aBuilder);
NS_ASSERTION(IsFrameVisible(mFrame, matrix),
"We can't have hit a frame that isn't visible!");
Matrix4x4 inverse = matrix;
inverse.Invert();
Point4D point =
inverse.ProjectPoint(Point(NSAppUnitsToFloatPixels(aPoint.x, factor),
NSAppUnitsToFloatPixels(aPoint.y, factor)));
Point point2d = point.As2DPoint();
Point3D transformed = matrix.TransformPoint(Point3D(point2d.x, point2d.y, 0));
return transformed.z;
}
/* The transform is opaque iff the transform consists solely of scales and
* translations and if the underlying content is opaque. Thus if the transform
* is of the form
*
* |a c e|
* |b d f|
* |0 0 1|
*
* We need b and c to be zero.
*
* We also need to check whether the underlying opaque content completely fills
* our visible rect. We use UntransformRect which expands to the axis-aligned
* bounding rect, but that's OK since if
* mStoredList.GetVisibleRect().Contains(untransformedVisible), then it
* certainly contains the actual (non-axis-aligned) untransformed rect.
*/
nsRegion nsDisplayTransform::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = false;
nsRect untransformedVisible;
if (!UntransformBuildingRect(aBuilder, &untransformedVisible)) {
return nsRegion();
}
const Matrix4x4Flagged& matrix = GetTransform();
Matrix matrix2d;
if (!matrix.Is2D(&matrix2d) || !matrix2d.PreservesAxisAlignedRectangles()) {
return nsRegion();
}
nsRegion result;
bool tmpSnap;
const nsRect bounds = GetUntransformedBounds(aBuilder, &tmpSnap);
const nsRegion opaque =
::mozilla::GetOpaqueRegion(aBuilder, GetChildren(), bounds);
if (opaque.Contains(untransformedVisible)) {
result = GetBuildingRect().Intersect(GetBounds(aBuilder, &tmpSnap));
}
return result;
}
nsRect nsDisplayTransform::GetComponentAlphaBounds(
nsDisplayListBuilder* aBuilder) const {
if (GetChildren()->GetComponentAlphaBounds(aBuilder).IsEmpty()) {
return nsRect();
}
bool snap;
return GetBounds(aBuilder, &snap);
}
/* TransformRect takes in as parameters a rectangle (in app space) and returns
* the smallest rectangle (in app space) containing the transformed image of
* that rectangle. That is, it takes the four corners of the rectangle,
* transforms them according to the matrix associated with the specified frame,
* then returns the smallest rectangle containing the four transformed points.
*
* @param aUntransformedBounds The rectangle (in app units) to transform.
* @param aFrame The frame whose transformation should be applied.
* @param aOrigin The delta from the frame origin to the coordinate space origin
* @return The smallest rectangle containing the image of the transformed
* rectangle.
*/
nsRect nsDisplayTransform::TransformRect(const nsRect& aUntransformedBounds,
const nsIFrame* aFrame,
TransformReferenceBox& aRefBox) {
MOZ_ASSERT(aFrame, "Can't take the transform based on a null frame!");
float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
FrameTransformProperties props(aFrame, aRefBox, factor);
return nsLayoutUtils::MatrixTransformRect(
aUntransformedBounds,
GetResultingTransformMatrixInternal(props, aRefBox, nsPoint(), factor,
kTransformRectFlags),
factor);
}
bool nsDisplayTransform::UntransformRect(const nsRect& aTransformedBounds,
const nsRect& aChildBounds,
const nsIFrame* aFrame,
nsRect* aOutRect) {
MOZ_ASSERT(aFrame, "Can't take the transform based on a null frame!");
float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
Matrix4x4 transform = GetResultingTransformMatrix(aFrame, nsPoint(), factor,
kTransformRectFlags);
return UntransformRect(aTransformedBounds, aChildBounds, transform, factor,
aOutRect);
}
bool nsDisplayTransform::UntransformRect(const nsRect& aTransformedBounds,
const nsRect& aChildBounds,
const Matrix4x4& aMatrix,
float aAppUnitsPerPixel,
nsRect* aOutRect) {
if (aMatrix.IsSingular()) {
return false;
}
RectDouble result(
NSAppUnitsToFloatPixels(aTransformedBounds.x, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(aTransformedBounds.y, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(aTransformedBounds.width, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(aTransformedBounds.height, aAppUnitsPerPixel));
RectDouble childGfxBounds(
NSAppUnitsToFloatPixels(aChildBounds.x, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(aChildBounds.y, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(aChildBounds.width, aAppUnitsPerPixel),
NSAppUnitsToFloatPixels(aChildBounds.height, aAppUnitsPerPixel));
result = aMatrix.Inverse().ProjectRectBounds(result, childGfxBounds);
*aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(ThebesRect(result),
aAppUnitsPerPixel);
return true;
}
bool nsDisplayTransform::UntransformRect(nsDisplayListBuilder* aBuilder,
const nsRect& aRect,
nsRect* aOutRect) const {
if (GetTransform().IsSingular()) {
return false;
}
// GetTransform always operates in dev pixels.
float factor = mFrame->PresContext()->AppUnitsPerDevPixel();
RectDouble result(NSAppUnitsToFloatPixels(aRect.x, factor),
NSAppUnitsToFloatPixels(aRect.y, factor),
NSAppUnitsToFloatPixels(aRect.width, factor),
NSAppUnitsToFloatPixels(aRect.height, factor));
bool snap;
nsRect childBounds = GetUntransformedBounds(aBuilder, &snap);
RectDouble childGfxBounds(
NSAppUnitsToFloatPixels(childBounds.x, factor),
NSAppUnitsToFloatPixels(childBounds.y, factor),
NSAppUnitsToFloatPixels(childBounds.width, factor),
NSAppUnitsToFloatPixels(childBounds.height, factor));
/* We want to untransform the matrix, so invert the transformation first! */
result = GetInverseTransform().ProjectRectBounds(result, childGfxBounds);
*aOutRect = nsLayoutUtils::RoundGfxRectToAppRect(ThebesRect(result), factor);
return true;
}
void nsDisplayTransform::WriteDebugInfo(std::stringstream& aStream) {
aStream << GetTransform().GetMatrix();
if (IsTransformSeparator()) {
aStream << " transform-separator";
}
if (IsLeafOf3DContext()) {
aStream << " 3d-context-leaf";
}
if (mFrame->Extend3DContext()) {
aStream << " extends-3d-context";
}
if (mFrame->Combines3DTransformWithAncestors()) {
aStream << " combines-3d-with-ancestors";
}
aStream << " prerender(";
switch (mPrerenderDecision) {
case PrerenderDecision::No:
aStream << "no";
break;
case PrerenderDecision::Partial:
aStream << "partial";
break;
case PrerenderDecision::Full:
aStream << "full";
break;
}
aStream << ")";
aStream << " childrenBuildingRect" << mChildrenBuildingRect;
}
nsDisplayPerspective::nsDisplayPerspective(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList)
: nsPaintedDisplayItem(aBuilder, aFrame), mList(aBuilder) {
mList.AppendToTop(aList);
MOZ_ASSERT(mList.Length() == 1);
MOZ_ASSERT(mList.GetTop()->GetType() == DisplayItemType::TYPE_TRANSFORM);
}
void nsDisplayPerspective::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
// Just directly recurse into children, since we'll include the persepctive
// value in any nsDisplayTransform children.
GetChildren()->Paint(aBuilder, aCtx,
mFrame->PresContext()->AppUnitsPerDevPixel());
}
nsRegion nsDisplayPerspective::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
if (!GetChildren()->GetTop()) {
*aSnap = false;
return nsRegion();
}
return GetChildren()->GetTop()->GetOpaqueRegion(aBuilder, aSnap);
}
bool nsDisplayPerspective::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
float appUnitsPerPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
Matrix4x4 perspectiveMatrix;
DebugOnly<bool> hasPerspective = nsDisplayTransform::ComputePerspectiveMatrix(
mFrame, appUnitsPerPixel, perspectiveMatrix);
MOZ_ASSERT(hasPerspective, "Why did we create nsDisplayPerspective?");
/*
* ClipListToRange can remove our child after we were created.
*/
if (!GetChildren()->GetTop()) {
return false;
}
/*
* The resulting matrix is still in the coordinate space of the transformed
* frame. Append a translation to the reference frame coordinates.
*/
nsDisplayTransform* transform =
static_cast<nsDisplayTransform*>(GetChildren()->GetTop());
Point3D newOrigin =
Point3D(NSAppUnitsToFloatPixels(transform->ToReferenceFrame().x,
appUnitsPerPixel),
NSAppUnitsToFloatPixels(transform->ToReferenceFrame().y,
appUnitsPerPixel),
0.0f);
Point3D roundedOrigin(NS_round(newOrigin.x), NS_round(newOrigin.y), 0);
perspectiveMatrix.PostTranslate(roundedOrigin);
nsIFrame* perspectiveFrame =
mFrame->GetClosestFlattenedTreeAncestorPrimaryFrame();
// Passing true here is always correct, since perspective always combines
// transforms with the descendants. However that'd make WR do a lot of work
// that it doesn't really need to do if there aren't other transforms forming
// part of the 3D context.
//
// WR knows how to treat perspective in that case, so the only thing we need
// to do is to ensure we pass true when we're involved in a 3d context in any
// other way via the transform-style property on either the transformed frame
// or the perspective frame in order to not confuse WR's preserve-3d code in
// very awful ways.
bool preserve3D =
mFrame->Extend3DContext() || perspectiveFrame->Extend3DContext();
wr::StackingContextParams params;
wr::WrTransformInfo transform_info;
transform_info.transform = wr::ToLayoutTransform(perspectiveMatrix);
transform_info.key = wr::SpatialKey(uint64_t(mFrame), GetPerFrameKey(),
wr::SpatialKeyKind::Perspective);
params.mTransformPtr = &transform_info;
params.reference_frame_kind = wr::WrReferenceFrameKind::Perspective;
params.prim_flags = !BackfaceIsHidden()
? wr::PrimitiveFlags::IS_BACKFACE_VISIBLE
: wr::PrimitiveFlags{0};
params.SetPreserve3D(preserve3D);
params.clip =
wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
Maybe<uint64_t> scrollingRelativeTo;
for (const auto* asr = GetActiveScrolledRoot(); asr; asr = asr->mParent) {
// In OOP documents, the root scrollable frame of the in-process root
// document is always active, so using IsAncestorFrameCrossDocInProcess
// should be fine here.
if (nsLayoutUtils::IsAncestorFrameCrossDocInProcess(
asr->mScrollableFrame->GetScrolledFrame(), perspectiveFrame)) {
scrollingRelativeTo.emplace(asr->GetViewId());
break;
}
}
// We put the perspective reference frame wrapping the transformed frame,
// even though there may be arbitrarily nested scroll frames in between.
//
// We need to know how many ancestor scroll-frames are we nested in, in order
// for the async scrolling code in WebRender to calculate the right
// transformation for the perspective contents.
params.scrolling_relative_to = scrollingRelativeTo.ptrOr(nullptr);
StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
params);
aManager->CommandBuilder().CreateWebRenderCommandsFromDisplayList(
GetChildren(), this, aDisplayListBuilder, sc, aBuilder, aResources);
return true;
}
nsDisplayText::nsDisplayText(nsDisplayListBuilder* aBuilder,
nsTextFrame* aFrame)
: nsPaintedDisplayItem(aBuilder, aFrame),
mVisIStartEdge(0),
mVisIEndEdge(0) {
MOZ_COUNT_CTOR(nsDisplayText);
mBounds = mFrame->InkOverflowRectRelativeToSelf() + ToReferenceFrame();
mBounds.Inflate(mFrame->PresContext()->AppUnitsPerDevPixel());
mVisibleRect = aBuilder->GetVisibleRect() +
aBuilder->GetCurrentFrameOffsetToReferenceFrame();
}
bool nsDisplayText::CanApplyOpacity(WebRenderLayerManager* aManager,
nsDisplayListBuilder* aBuilder) const {
auto* f = static_cast<nsTextFrame*>(mFrame);
if (f->IsSelected()) {
return false;
}
const nsStyleText* textStyle = f->StyleText();
if (textStyle->HasTextShadow()) {
return false;
}
nsTextFrame::TextDecorations decorations;
f->GetTextDecorations(f->PresContext(), nsTextFrame::eResolvedColors,
decorations);
return !decorations.HasDecorationLines();
}
void nsDisplayText::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
AUTO_PROFILER_LABEL("nsDisplayText::Paint", GRAPHICS);
// We don't pass mVisibleRect here, since this can be called from within
// the WebRender fallback painting path, and we don't want to issue
// recorded commands that are dependent on the visible/building rect.
RenderToContext(aCtx, aBuilder, GetPaintRect(aBuilder, aCtx));
auto* textFrame = static_cast<nsTextFrame*>(mFrame);
LCPTextFrameHelper::MaybeUnionTextFrame(textFrame,
mBounds - ToReferenceFrame());
}
bool nsDisplayText::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
auto* f = static_cast<nsTextFrame*>(mFrame);
auto appUnitsPerDevPixel = f->PresContext()->AppUnitsPerDevPixel();
nsRect bounds = f->WebRenderBounds() + ToReferenceFrame();
bounds.Inflate(appUnitsPerDevPixel);
if (bounds.IsEmpty()) {
return true;
}
// For large font sizes, punt to a blob image, to avoid the blurry rendering
// that results from WR clamping the glyph size used for rasterization.
//
// (See FONT_SIZE_LIMIT in webrender/src/glyph_rasterizer/mod.rs.)
//
// This is not strictly accurate, as final used font sizes might not be the
// same as claimed by the fontGroup's style.size (eg: due to font-size-adjust
// altering the used size of the font actually used).
// It also fails to consider how transforms might affect the device-font-size
// that webrender uses (and clamps).
// But it should be near enough for practical purposes; the limitations just
// mean we might sometimes end up with webrender still applying some bitmap
// scaling, or bail out when we didn't really need to.
constexpr float kWebRenderFontSizeLimit = 320.0;
f->EnsureTextRun(nsTextFrame::eInflated);
gfxTextRun* textRun = f->GetTextRun(nsTextFrame::eInflated);
if (textRun &&
textRun->GetFontGroup()->GetStyle()->size > kWebRenderFontSizeLimit) {
return false;
}
gfx::Point deviceOffset =
LayoutDevicePoint::FromAppUnits(bounds.TopLeft(), appUnitsPerDevPixel)
.ToUnknownPoint();
// Clipping the bounds to the PaintRect (factoring in what's covered by parent
// frames) lets us early reject a bunch of things.
nsRect visible = mVisibleRect;
// Add the "source rect" area from which the given shadows could intersect
// with mVisibleRect, and which therefore needs to included in the paint
// operation, to the `visible` rect that we will use to limit the bounds of
// what we send to the renderer.
auto addShadowSourceToVisible = [&](Span<const StyleSimpleShadow> aShadows) {
for (const auto& shadow : aShadows) {
nsRect sourceRect = mVisibleRect;
// Negate the offsets, because we're looking for the "source" rect that
// could cast a shadow into the visible rect, rather than a "target" area
// onto which the visible rect would cast a shadow.
sourceRect.MoveBy(-shadow.horizontal.ToAppUnits(),
-shadow.vertical.ToAppUnits());
// Inflate to account for the shadow blur.
sourceRect.Inflate(nsContextBoxBlur::GetBlurRadiusMargin(
shadow.blur.ToAppUnits(), appUnitsPerDevPixel));
visible.OrWith(sourceRect);
}
};
// Shadows can translate things back into view, so we enlarge the notional
// "visible" rect to ensure we don't skip painting relevant parts that might
// cast a shadow within the visible area.
addShadowSourceToVisible(f->StyleText()->mTextShadow.AsSpan());
// Similarly for shadows that may be cast by ::selection.
if (f->IsSelected()) {
nsTextPaintStyle textPaint(f);
Span<const StyleSimpleShadow> shadows;
f->GetSelectionTextShadow(SelectionType::eNormal, textPaint, &shadows);
addShadowSourceToVisible(shadows);
}
// Inflate a little extra to allow for potential antialiasing "blur".
visible.Inflate(3 * appUnitsPerDevPixel);
bounds = bounds.Intersect(visible);
gfxContext* textDrawer = aBuilder.GetTextContext(aResources, aSc, aManager,
this, bounds, deviceOffset);
LCPTextFrameHelper::MaybeUnionTextFrame(f, bounds - ToReferenceFrame());
aBuilder.StartGroup(this);
RenderToContext(textDrawer, aDisplayListBuilder, mVisibleRect,
aBuilder.GetInheritedOpacity(), true);
const bool result = textDrawer->GetTextDrawer()->Finish();
if (result) {
aBuilder.FinishGroup();
} else {
aBuilder.CancelGroup(true);
}
return result;
}
void nsDisplayText::RenderToContext(gfxContext* aCtx,
nsDisplayListBuilder* aBuilder,
const nsRect& aVisibleRect, float aOpacity,
bool aIsRecording) {
nsTextFrame* f = static_cast<nsTextFrame*>(mFrame);
// Add 1 pixel of dirty area around mVisibleRect to allow us to paint
// antialiased pixels beyond the measured text extents.
// This is temporary until we do this in the actual calculation of text
// extents.
auto A2D = mFrame->PresContext()->AppUnitsPerDevPixel();
LayoutDeviceRect extraVisible =
LayoutDeviceRect::FromAppUnits(aVisibleRect, A2D);
extraVisible.Inflate(1);
gfxRect pixelVisible(extraVisible.x, extraVisible.y, extraVisible.width,
extraVisible.height);
pixelVisible.Inflate(2);
pixelVisible.RoundOut();
gfxClipAutoSaveRestore autoSaveClip(aCtx);
if (!aBuilder->IsForGenerateGlyphMask() && !aIsRecording) {
autoSaveClip.Clip(pixelVisible);
}
NS_ASSERTION(mVisIStartEdge >= 0, "illegal start edge");
NS_ASSERTION(mVisIEndEdge >= 0, "illegal end edge");
gfxContextMatrixAutoSaveRestore matrixSR;
nsPoint framePt = ToReferenceFrame();
if (f->Style()->IsTextCombined()) {
float scaleFactor = nsTextFrame::GetTextCombineScaleFactor(f);
if (scaleFactor != 1.0f) {
if (auto* textDrawer = aCtx->GetTextDrawer()) {
// WebRender doesn't support scaling text like this yet
textDrawer->FoundUnsupportedFeature();
return;
}
matrixSR.SetContext(aCtx);
// Setup matrix to compress text for text-combine-upright if
// necessary. This is done here because we want selection be
// compressed at the same time as text.
gfxPoint pt = nsLayoutUtils::PointToGfxPoint(framePt, A2D);
gfxTextRun* textRun = f->GetTextRun(nsTextFrame::eInflated);
if (textRun && textRun->IsRightToLeft()) {
pt.x += gfxFloat(f->GetSize().width) / A2D;
}
gfxMatrix mat = aCtx->CurrentMatrixDouble()
.PreTranslate(pt)
.PreScale(scaleFactor, 1.0)
.PreTranslate(-pt);
aCtx->SetMatrixDouble(mat);
}
}
nsTextFrame::PaintTextParams params(aCtx);
params.framePt = gfx::Point(framePt.x, framePt.y);
params.dirtyRect = extraVisible;
if (aBuilder->IsForGenerateGlyphMask()) {
params.state = nsTextFrame::PaintTextParams::GenerateTextMask;
} else {
params.state = nsTextFrame::PaintTextParams::PaintText;
}
f->PaintText(params, mVisIStartEdge, mVisIEndEdge, ToReferenceFrame(),
f->IsSelected(), aOpacity);
}
// This could go to nsDisplayListInvalidation.h, but
// |nsTextFrame::TextDecorations| requires including of nsTextFrame.h which
// would produce circular dependencies.
class nsDisplayTextGeometry : public nsDisplayItemGenericGeometry {
public:
nsDisplayTextGeometry(nsDisplayText* aItem, nsDisplayListBuilder* aBuilder)
: nsDisplayItemGenericGeometry(aItem, aBuilder),
mVisIStartEdge(aItem->VisIStartEdge()),
mVisIEndEdge(aItem->VisIEndEdge()) {
nsTextFrame* f = static_cast<nsTextFrame*>(aItem->Frame());
f->GetTextDecorations(f->PresContext(), nsTextFrame::eResolvedColors,
mDecorations);
}
/**
* We store the computed text decorations here since they are
* computed using style data from parent frames. Any changes to these
* styles will only invalidate the parent frame and not this frame.
*/
nsTextFrame::TextDecorations mDecorations;
nscoord mVisIStartEdge;
nscoord mVisIEndEdge;
};
nsDisplayItemGeometry* nsDisplayText::AllocateGeometry(
nsDisplayListBuilder* aBuilder) {
return new nsDisplayTextGeometry(this, aBuilder);
}
void nsDisplayText::ComputeInvalidationRegion(
nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const {
const nsDisplayTextGeometry* geometry =
static_cast<const nsDisplayTextGeometry*>(aGeometry);
nsTextFrame* f = static_cast<nsTextFrame*>(mFrame);
nsTextFrame::TextDecorations decorations;
f->GetTextDecorations(f->PresContext(), nsTextFrame::eResolvedColors,
decorations);
bool snap;
const nsRect& newRect = geometry->mBounds;
nsRect oldRect = GetBounds(aBuilder, &snap);
if (decorations != geometry->mDecorations ||
mVisIStartEdge != geometry->mVisIStartEdge ||
mVisIEndEdge != geometry->mVisIEndEdge ||
!oldRect.IsEqualInterior(newRect) ||
!geometry->mBorderRect.IsEqualInterior(GetBorderRect())) {
aInvalidRegion->Or(oldRect, newRect);
}
}
void nsDisplayText::WriteDebugInfo(std::stringstream& aStream) {
#ifdef DEBUG
aStream << " (\"";
nsTextFrame* f = static_cast<nsTextFrame*>(mFrame);
nsCString buf;
f->ToCString(buf);
aStream << buf.get() << "\")";
#endif
}
nsDisplayEffectsBase::nsDisplayEffectsBase(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aActiveScrolledRoot, bool aClearClipChain)
: nsDisplayWrapList(aBuilder, aFrame, aList, aActiveScrolledRoot,
aClearClipChain) {
MOZ_COUNT_CTOR(nsDisplayEffectsBase);
}
nsDisplayEffectsBase::nsDisplayEffectsBase(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList)
: nsDisplayWrapList(aBuilder, aFrame, aList) {
MOZ_COUNT_CTOR(nsDisplayEffectsBase);
}
nsRegion nsDisplayEffectsBase::GetOpaqueRegion(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
*aSnap = false;
return nsRegion();
}
void nsDisplayEffectsBase::HitTest(nsDisplayListBuilder* aBuilder,
const nsRect& aRect, HitTestState* aState,
nsTArray<nsIFrame*>* aOutFrames) {
nsPoint rectCenter(aRect.x + aRect.width / 2, aRect.y + aRect.height / 2);
if (SVGIntegrationUtils::HitTestFrameForEffects(
mFrame, rectCenter - ToReferenceFrame())) {
mList.HitTest(aBuilder, aRect, aState, aOutFrames);
}
}
gfxRect nsDisplayEffectsBase::BBoxInUserSpace() const {
return SVGUtils::GetBBox(mFrame);
}
gfxPoint nsDisplayEffectsBase::UserSpaceOffset() const {
return SVGUtils::FrameSpaceInCSSPxToUserSpaceOffset(mFrame);
}
void nsDisplayEffectsBase::ComputeInvalidationRegion(
nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const {
const auto* geometry =
static_cast<const nsDisplaySVGEffectGeometry*>(aGeometry);
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
if (geometry->mFrameOffsetToReferenceFrame != ToReferenceFrame() ||
geometry->mUserSpaceOffset != UserSpaceOffset() ||
!geometry->mBBox.IsEqualInterior(BBoxInUserSpace())) {
// Filter and mask output can depend on the location of the frame's user
// space and on the frame's BBox. We need to invalidate if either of these
// change relative to the reference frame.
// Invalidations from our inactive layer manager are not enough to catch
// some of these cases because filters can produce output even if there's
// nothing in the filter input.
aInvalidRegion->Or(bounds, geometry->mBounds);
}
}
bool nsDisplayEffectsBase::ValidateSVGFrame() {
if (mFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
ISVGDisplayableFrame* svgFrame = do_QueryFrame(mFrame);
if (!svgFrame) {
return false;
}
if (auto* svgElement = SVGElement::FromNode(mFrame->GetContent())) {
// The SVG spec says only to draw filters if the element
// has valid dimensions.
return svgElement->HasValidDimensions();
}
return false;
}
return true;
}
using PaintFramesParams = SVGIntegrationUtils::PaintFramesParams;
static void ComputeMaskGeometry(PaintFramesParams& aParams) {
// Properties are added lazily and may have been removed by a restyle, so
// make sure all applicable ones are set again.
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aParams.frame);
const nsStyleSVGReset* svgReset = firstFrame->StyleSVGReset();
nsTArray<SVGMaskFrame*> maskFrames;
// XXX check return value?
SVGObserverUtils::GetAndObserveMasks(firstFrame, &maskFrames);
if (maskFrames.Length() == 0) {
return;
}
gfxContext& ctx = aParams.ctx;
nsIFrame* frame = aParams.frame;
nsPoint offsetToUserSpace =
nsLayoutUtils::ComputeOffsetToUserSpace(aParams.builder, aParams.frame);
auto cssToDevScale = frame->PresContext()->CSSToDevPixelScale();
int32_t appUnitsPerDevPixel = frame->PresContext()->AppUnitsPerDevPixel();
gfxPoint devPixelOffsetToUserSpace =
nsLayoutUtils::PointToGfxPoint(offsetToUserSpace, appUnitsPerDevPixel);
gfxContextMatrixAutoSaveRestore matSR(&ctx);
ctx.SetMatrixDouble(
ctx.CurrentMatrixDouble().PreTranslate(devPixelOffsetToUserSpace));
// Convert boaderArea and dirtyRect to user space.
nsRect userSpaceBorderArea = aParams.borderArea - offsetToUserSpace;
nsRect userSpaceDirtyRect = aParams.dirtyRect - offsetToUserSpace;
// Union all mask layer rectangles in user space.
LayoutDeviceRect maskInUserSpace;
for (size_t i = 0; i < maskFrames.Length(); i++) {
SVGMaskFrame* maskFrame = maskFrames[i];
LayoutDeviceRect currentMaskSurfaceRect;
if (maskFrame) {
auto rect = maskFrame->GetMaskArea(aParams.frame);
currentMaskSurfaceRect =
CSSRect::FromUnknownRect(ToRect(rect)) * cssToDevScale;
} else {
nsCSSRendering::ImageLayerClipState clipState;
nsCSSRendering::GetImageLayerClip(
svgReset->mMask.mLayers[i], frame, *frame->StyleBorder(),
userSpaceBorderArea, userSpaceDirtyRect,
/* aWillPaintBorder = */ false, appUnitsPerDevPixel, &clipState);
currentMaskSurfaceRect = LayoutDeviceRect::FromUnknownRect(
ToRect(clipState.mDirtyRectInDevPx));
}
maskInUserSpace = maskInUserSpace.Union(currentMaskSurfaceRect);
}
if (!maskInUserSpace.IsEmpty()) {
aParams.maskRect = Some(maskInUserSpace);
} else {
aParams.maskRect = Nothing();
}
}
nsDisplayMasksAndClipPaths::nsDisplayMasksAndClipPaths(
nsDisplayListBuilder* aBuilder, nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aActiveScrolledRoot, bool aWrapsBackdropFilter)
: nsDisplayEffectsBase(aBuilder, aFrame, aList, aActiveScrolledRoot, true),
mWrapsBackdropFilter(aWrapsBackdropFilter) {
MOZ_COUNT_CTOR(nsDisplayMasksAndClipPaths);
nsPresContext* presContext = mFrame->PresContext();
uint32_t flags =
aBuilder->GetBackgroundPaintFlags() | nsCSSRendering::PAINTBG_MASK_IMAGE;
const nsStyleSVGReset* svgReset = aFrame->StyleSVGReset();
NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT(i, svgReset->mMask) {
const auto& layer = svgReset->mMask.mLayers[i];
if (!layer.mImage.IsResolved()) {
continue;
}
const nsRect& borderArea = mFrame->GetRectRelativeToSelf();
// NOTE(emilio): We only care about the dest rect so we don't bother
// computing a clip.
bool isTransformedFixed = false;
nsBackgroundLayerState state = nsCSSRendering::PrepareImageLayer(
presContext, aFrame, flags, borderArea, borderArea, layer,
&isTransformedFixed);
mDestRects.AppendElement(state.mDestArea);
}
}
static bool CanMergeDisplayMaskFrame(nsIFrame* aFrame) {
// Do not merge items for box-decoration-break:clone elements,
// since each box should have its own mask in that case.
if (aFrame->StyleBorder()->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Clone) {
return false;
}
// Do not merge if either frame has a mask. Continuation frames should apply
// the mask independently (just like nsDisplayBackgroundImage).
if (aFrame->StyleSVGReset()->HasMask()) {
return false;
}
return true;
}
bool nsDisplayMasksAndClipPaths::CanMerge(const nsDisplayItem* aItem) const {
// Items for the same content element should be merged into a single
// compositing group.
if (!HasDifferentFrame(aItem) || !HasSameTypeAndClip(aItem) ||
!HasSameContent(aItem)) {
return false;
}
return CanMergeDisplayMaskFrame(mFrame) &&
CanMergeDisplayMaskFrame(aItem->Frame());
}
bool nsDisplayMasksAndClipPaths::IsValidMask() {
if (!ValidateSVGFrame()) {
return false;
}
return SVGUtils::DetermineMaskUsage(mFrame, false).UsingMaskOrClipPath();
}
bool nsDisplayMasksAndClipPaths::PaintMask(nsDisplayListBuilder* aBuilder,
gfxContext* aMaskContext,
bool aHandleOpacity,
bool* aMaskPainted) {
MOZ_ASSERT(aMaskContext->GetDrawTarget()->GetFormat() == SurfaceFormat::A8);
imgDrawingParams imgParams(aBuilder->GetImageDecodeFlags());
nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize());
PaintFramesParams params(*aMaskContext, mFrame, mBounds, borderArea, aBuilder,
aHandleOpacity, imgParams);
ComputeMaskGeometry(params);
bool maskIsComplete = false;
bool painted = SVGIntegrationUtils::PaintMask(params, maskIsComplete);
if (aMaskPainted) {
*aMaskPainted = painted;
}
return maskIsComplete &&
(imgParams.result == ImgDrawResult::SUCCESS ||
imgParams.result == ImgDrawResult::SUCCESS_NOT_COMPLETE ||
imgParams.result == ImgDrawResult::WRONG_SIZE);
}
void nsDisplayMasksAndClipPaths::ComputeInvalidationRegion(
nsDisplayListBuilder* aBuilder, const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const {
nsDisplayEffectsBase::ComputeInvalidationRegion(aBuilder, aGeometry,
aInvalidRegion);
const auto* geometry =
static_cast<const nsDisplayMasksAndClipPathsGeometry*>(aGeometry);
bool snap;
nsRect bounds = GetBounds(aBuilder, &snap);
if (mDestRects.Length() != geometry->mDestRects.Length()) {
aInvalidRegion->Or(bounds, geometry->mBounds);
} else {
for (size_t i = 0; i < mDestRects.Length(); i++) {
if (!mDestRects[i].IsEqualInterior(geometry->mDestRects[i])) {
aInvalidRegion->Or(bounds, geometry->mBounds);
break;
}
}
}
}
void nsDisplayMasksAndClipPaths::PaintWithContentsPaintCallback(
nsDisplayListBuilder* aBuilder, gfxContext* aCtx,
const std::function<void()>& aPaintChildren) {
// Clip the drawing target by mVisibleRect, which contains the visible
// region of the target frame and its out-of-flow and inflow descendants.
Rect bounds = NSRectToRect(GetPaintRect(aBuilder, aCtx),
mFrame->PresContext()->AppUnitsPerDevPixel());
bounds.RoundOut();
gfxClipAutoSaveRestore autoSaveClip(aCtx);
autoSaveClip.Clip(bounds);
imgDrawingParams imgParams(aBuilder->GetImageDecodeFlags());
nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize());
PaintFramesParams params(*aCtx, mFrame, GetPaintRect(aBuilder, aCtx),
borderArea, aBuilder, false, imgParams);
ComputeMaskGeometry(params);
SVGIntegrationUtils::PaintMaskAndClipPath(params, aPaintChildren);
}
void nsDisplayMasksAndClipPaths::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
if (!IsValidMask()) {
return;
}
PaintWithContentsPaintCallback(aBuilder, aCtx, [&] {
GetChildren()->Paint(aBuilder, aCtx,
mFrame->PresContext()->AppUnitsPerDevPixel());
});
}
static Maybe<wr::WrClipChainId> CreateSimpleClipRegion(
const nsDisplayMasksAndClipPaths& aDisplayItem,
wr::DisplayListBuilder& aBuilder) {
nsIFrame* frame = aDisplayItem.Frame();
const auto* style = frame->StyleSVGReset();
MOZ_ASSERT(style->HasClipPath() || style->HasMask());
if (!SVGUtils::DetermineMaskUsage(frame, false).IsSimpleClipShape()) {
return Nothing();
}
const auto& clipPath = style->mClipPath;
const auto& shape = *clipPath.AsShape()._0;
auto appUnitsPerDevPixel = frame->PresContext()->AppUnitsPerDevPixel();
const nsRect refBox =
nsLayoutUtils::ComputeClipPathGeometryBox(frame, clipPath.AsShape()._1);
wr::WrClipId clipId{};
switch (shape.tag) {
case StyleBasicShape::Tag::Rect: {
const nsRect rect =
ShapeUtils::ComputeInsetRect(shape.AsRect().rect, refBox) +
aDisplayItem.ToReferenceFrame();
nscoord radii[8] = {0};
if (ShapeUtils::ComputeRectRadii(shape.AsRect().round, refBox, rect,
radii)) {
clipId = aBuilder.DefineRoundedRectClip(
Nothing(),
wr::ToComplexClipRegion(rect, radii, appUnitsPerDevPixel));
} else {
clipId = aBuilder.DefineRectClip(
Nothing(), wr::ToLayoutRect(LayoutDeviceRect::FromAppUnits(
rect, appUnitsPerDevPixel)));
}
break;
}
case StyleBasicShape::Tag::Ellipse:
case StyleBasicShape::Tag::Circle: {
nsPoint center = ShapeUtils::ComputeCircleOrEllipseCenter(shape, refBox);
nsSize radii;
if (shape.IsEllipse()) {
radii = ShapeUtils::ComputeEllipseRadii(shape, center, refBox);
} else {
nscoord radius = ShapeUtils::ComputeCircleRadius(shape, center, refBox);
radii = {radius, radius};
}
nsRect ellipseRect(aDisplayItem.ToReferenceFrame() + center -
nsPoint(radii.width, radii.height),
radii * 2);
nscoord ellipseRadii[8];
for (const auto corner : AllPhysicalHalfCorners()) {
ellipseRadii[corner] =
HalfCornerIsX(corner) ? radii.width : radii.height;
}
clipId = aBuilder.DefineRoundedRectClip(
Nothing(), wr::ToComplexClipRegion(ellipseRect, ellipseRadii,
appUnitsPerDevPixel));
break;
}
default:
// Please don't add more exceptions, try to find a way to define the clip
// without using a mask image.
//
// And if you _really really_ need to add an exception, add it to
// SVGUtils::DetermineMaskUsage
MOZ_ASSERT_UNREACHABLE("Unhandled shape id?");
return Nothing();
}
wr::WrClipChainId clipChainId = aBuilder.DefineClipChain({clipId}, true);
return Some(clipChainId);
}
static void FillPolygonDataForDisplayItem(
const nsDisplayMasksAndClipPaths& aDisplayItem,
nsTArray<wr::LayoutPoint>& aPoints, wr::FillRule& aFillRule) {
nsIFrame* frame = aDisplayItem.Frame();
const auto* style = frame->StyleSVGReset();
bool isPolygon = style->HasClipPath() && style->mClipPath.IsShape() &&
style->mClipPath.AsShape()._0->IsPolygon();
if (!isPolygon) {
return;
}
const auto& clipPath = style->mClipPath;
const auto& shape = *clipPath.AsShape()._0;
const nsRect refBox =
nsLayoutUtils::ComputeClipPathGeometryBox(frame, clipPath.AsShape()._1);
// We only fill polygon data for polygons that are below a complexity
// limit.
nsTArray<nsPoint> vertices =
ShapeUtils::ComputePolygonVertices(shape, refBox);
if (vertices.Length() > wr::POLYGON_CLIP_VERTEX_MAX) {
return;
}
auto appUnitsPerDevPixel = frame->PresContext()->AppUnitsPerDevPixel();
for (size_t i = 0; i < vertices.Length(); ++i) {
wr::LayoutPoint point = wr::ToLayoutPoint(
LayoutDevicePoint::FromAppUnits(vertices[i], appUnitsPerDevPixel));
aPoints.AppendElement(point);
}
aFillRule = (shape.AsPolygon().fill == StyleFillRule::Nonzero)
? wr::FillRule::Nonzero
: wr::FillRule::Evenodd;
}
static Maybe<wr::WrClipChainId> CreateWRClipPathAndMasks(
nsDisplayMasksAndClipPaths* aDisplayItem, const LayoutDeviceRect& aBounds,
wr::IpcResourceUpdateQueue& aResources, wr::DisplayListBuilder& aBuilder,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
if (auto clip = CreateSimpleClipRegion(*aDisplayItem, aBuilder)) {
return clip;
}
Maybe<wr::ImageMask> mask = aManager->CommandBuilder().BuildWrMaskImage(
aDisplayItem, aBuilder, aResources, aSc, aDisplayListBuilder, aBounds);
if (!mask) {
return Nothing();
}
// We couldn't create a simple clip region, but before we create an image
// mask clip, see if we can get a polygon clip to add to it.
nsTArray<wr::LayoutPoint> points;
wr::FillRule fillRule = wr::FillRule::Nonzero;
FillPolygonDataForDisplayItem(*aDisplayItem, points, fillRule);
wr::WrClipId clipId =
aBuilder.DefineImageMaskClip(mask.ref(), points, fillRule);
wr::WrClipChainId clipChainId = aBuilder.DefineClipChain({clipId}, true);
return Some(clipChainId);
}
bool nsDisplayMasksAndClipPaths::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
bool snap;
auto appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
nsRect displayBounds = GetBounds(aDisplayListBuilder, &snap);
LayoutDeviceRect bounds =
LayoutDeviceRect::FromAppUnits(displayBounds, appUnitsPerDevPixel);
Maybe<wr::WrClipChainId> clip = CreateWRClipPathAndMasks(
this, bounds, aResources, aBuilder, aSc, aManager, aDisplayListBuilder);
float oldOpacity = aBuilder.GetInheritedOpacity();
Maybe<StackingContextHelper> layer;
const StackingContextHelper* sc = &aSc;
if (clip) {
// Create a new stacking context to attach the mask to, ensuring the mask is
// applied to the aggregate, and not the individual elements.
// The stacking context shouldn't have any offset.
bounds.MoveTo(0, 0);
Maybe<float> opacity =
(SVGUtils::DetermineMaskUsage(mFrame, false).IsSimpleClipShape() &&
aBuilder.GetInheritedOpacity() != 1.0f)
? Some(aBuilder.GetInheritedOpacity())
: Nothing();
wr::StackingContextParams params;
params.clip = wr::WrStackingContextClip::ClipChain(clip->id);
params.opacity = opacity.ptrOr(nullptr);
if (mWrapsBackdropFilter) {
params.flags |= wr::StackingContextFlags::WRAPS_BACKDROP_FILTER;
}
layer.emplace(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder, params,
bounds);
sc = layer.ptr();
}
aBuilder.SetInheritedOpacity(1.0f);
const DisplayItemClipChain* oldClipChain = aBuilder.GetInheritedClipChain();
aBuilder.SetInheritedClipChain(nullptr);
CreateWebRenderCommandsNewClipListOption(aBuilder, aResources, *sc, aManager,
aDisplayListBuilder, layer.isSome());
aBuilder.SetInheritedOpacity(oldOpacity);
aBuilder.SetInheritedClipChain(oldClipChain);
return true;
}
Maybe<nsRect> nsDisplayMasksAndClipPaths::GetClipWithRespectToASR(
nsDisplayListBuilder* aBuilder, const ActiveScrolledRoot* aASR) const {
if (const DisplayItemClip* clip =
DisplayItemClipChain::ClipForASR(GetClipChain(), aASR)) {
return Some(clip->GetClipRect());
}
// This item does not have a clip with respect to |aASR|. However, we
// might still have finite bounds with respect to |aASR|. Check our
// children.
nsDisplayList* childList = GetSameCoordinateSystemChildren();
if (childList) {
return Some(childList->GetClippedBoundsWithRespectToASR(aBuilder, aASR));
}
#ifdef DEBUG
NS_ASSERTION(false, "item should have finite clip with respect to aASR");
#endif
return Nothing();
}
#ifdef MOZ_DUMP_PAINTING
void nsDisplayMasksAndClipPaths::PrintEffects(nsACString& aTo) {
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(mFrame);
bool first = true;
aTo += " effects=(";
SVGClipPathFrame* clipPathFrame;
// XXX Check return value?
SVGObserverUtils::GetAndObserveClipPath(firstFrame, &clipPathFrame);
if (clipPathFrame) {
if (!first) {
aTo += ", ";
}
aTo += nsPrintfCString(
"clip(%s)", clipPathFrame->IsTrivial() ? "trivial" : "non-trivial");
first = false;
} else if (mFrame->StyleSVGReset()->HasClipPath()) {
if (!first) {
aTo += ", ";
}
aTo += "clip(basic-shape)";
first = false;
}
nsTArray<SVGMaskFrame*> masks;
// XXX check return value?
SVGObserverUtils::GetAndObserveMasks(firstFrame, &masks);
if (!masks.IsEmpty() && masks[0]) {
if (!first) {
aTo += ", ";
}
aTo += "mask";
}
aTo += ")";
}
#endif
bool nsDisplayBackdropFilters::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
WrFiltersHolder wrFilters;
const ComputedStyle& style = mStyle ? *mStyle : *mFrame->Style();
auto filterChain = style.StyleEffects()->mBackdropFilters.AsSpan();
bool initialized = true;
if (!SVGIntegrationUtils::CreateWebRenderCSSFilters(filterChain, mFrame,
wrFilters) &&
!SVGIntegrationUtils::BuildWebRenderFilters(
mFrame, filterChain, StyleFilterType::BackdropFilter, wrFilters,
initialized)) {
// TODO: If painting backdrop-filters on the content side is implemented,
// consider returning false to fall back to that.
wrFilters = {};
}
if (!initialized) {
wrFilters = {};
}
nsCSSRendering::ImageLayerClipState clip;
nsCSSRendering::GetImageLayerClip(
style.StyleBackground()->BottomLayer(), mFrame, *style.StyleBorder(),
mBackdropRect, mBackdropRect, false,
mFrame->PresContext()->AppUnitsPerDevPixel(), &clip);
LayoutDeviceRect bounds = LayoutDeviceRect::FromAppUnits(
mBackdropRect, mFrame->PresContext()->AppUnitsPerDevPixel());
wr::ComplexClipRegion region =
wr::ToComplexClipRegion(clip.mBGClipArea, clip.mRadii,
mFrame->PresContext()->AppUnitsPerDevPixel());
aBuilder.PushBackdropFilter(wr::ToLayoutRect(bounds), region,
wrFilters.filters, wrFilters.filter_datas,
!BackfaceIsHidden());
wr::StackingContextParams params;
params.clip =
wr::WrStackingContextClip::ClipChain(aBuilder.CurrentClipChainId());
StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
params);
nsDisplayWrapList::CreateWebRenderCommands(aBuilder, aResources, sc, aManager,
aDisplayListBuilder);
return true;
}
void nsDisplayBackdropFilters::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
// TODO: Implement backdrop filters
GetChildren()->Paint(aBuilder, aCtx,
mFrame->PresContext()->AppUnitsPerDevPixel());
}
nsRect nsDisplayBackdropFilters::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const {
nsRect childBounds = nsDisplayWrapList::GetBounds(aBuilder, aSnap);
*aSnap = false;
return mBackdropRect.Union(childBounds);
}
/* static */
nsDisplayFilters::nsDisplayFilters(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
nsIFrame* aStyleFrame,
bool aWrapsBackdropFilter)
: nsDisplayEffectsBase(aBuilder, aFrame, aList),
mStyle(aFrame == aStyleFrame ? nullptr : aStyleFrame->Style()),
mEffectsBounds(aFrame->InkOverflowRectRelativeToSelf()),
mWrapsBackdropFilter(aWrapsBackdropFilter) {
MOZ_COUNT_CTOR(nsDisplayFilters);
mVisibleRect = aBuilder->GetVisibleRect() +
aBuilder->GetCurrentFrameOffsetToReferenceFrame();
}
void nsDisplayFilters::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
PaintWithContentsPaintCallback(aBuilder, aCtx, [&](gfxContext* aContext) {
GetChildren()->Paint(aBuilder, aContext,
mFrame->PresContext()->AppUnitsPerDevPixel());
});
}
void nsDisplayFilters::PaintWithContentsPaintCallback(
nsDisplayListBuilder* aBuilder, gfxContext* aCtx,
const std::function<void(gfxContext* aContext)>& aPaintChildren) {
imgDrawingParams imgParams(aBuilder->GetImageDecodeFlags());
nsRect borderArea = nsRect(ToReferenceFrame(), mFrame->GetSize());
PaintFramesParams params(*aCtx, mFrame, mVisibleRect, borderArea, aBuilder,
false, imgParams);
gfxPoint userSpaceToFrameSpaceOffset =
SVGIntegrationUtils::GetOffsetToUserSpaceInDevPx(mFrame, params);
auto filterChain = mStyle ? mStyle->StyleEffects()->mFilters.AsSpan()
: mFrame->StyleEffects()->mFilters.AsSpan();
SVGIntegrationUtils::PaintFilter(
params, filterChain,
[&](gfxContext& aContext, imgDrawingParams&, const gfxMatrix*,
const nsIntRect*) {
gfxContextMatrixAutoSaveRestore autoSR(&aContext);
aContext.SetMatrixDouble(aContext.CurrentMatrixDouble().PreTranslate(
-userSpaceToFrameSpaceOffset));
aPaintChildren(&aContext);
});
}
bool nsDisplayFilters::CanCreateWebRenderCommands() const {
return SVGIntegrationUtils::CanCreateWebRenderFiltersForFrame(mFrame);
}
bool nsDisplayFilters::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
WrFiltersHolder wrFilters;
const ComputedStyle& style = mStyle ? *mStyle : *mFrame->Style();
auto filterChain = style.StyleEffects()->mFilters.AsSpan();
bool initialized = true;
if (!SVGIntegrationUtils::CreateWebRenderCSSFilters(filterChain, mFrame,
wrFilters) &&
!SVGIntegrationUtils::BuildWebRenderFilters(mFrame, filterChain,
StyleFilterType::Filter,
wrFilters, initialized)) {
if (mStyle) {
// perhaps. For now treat it the same way as invalid filters.
wrFilters = {};
} else {
// Draw using fallback.
return false;
}
}
if (!initialized) {
//
// If the filter references a non-existent object or the referenced object
// is not a filter element, then the whole filter chain is ignored. No
// filter is applied to the object.
//
// Note that other engines have a weird discrepancy between SVG and HTML
// content here, but the spec is clear.
wrFilters = {};
}
uint64_t clipChainId;
if (wrFilters.post_filters_clip) {
auto devPxRect = LayoutDeviceRect::FromAppUnits(
wrFilters.post_filters_clip.value() + ToReferenceFrame(),
mFrame->PresContext()->AppUnitsPerDevPixel());
auto clipId =
aBuilder.DefineRectClip(Nothing(), wr::ToLayoutRect(devPxRect));
clipChainId = aBuilder.DefineClipChain({clipId}, true).id;
} else {
clipChainId = aBuilder.CurrentClipChainId();
}
wr::WrStackingContextClip clip =
wr::WrStackingContextClip::ClipChain(clipChainId);
float opacity = aBuilder.GetInheritedOpacity();
aBuilder.SetInheritedOpacity(1.0f);
const DisplayItemClipChain* oldClipChain = aBuilder.GetInheritedClipChain();
aBuilder.SetInheritedClipChain(nullptr);
wr::StackingContextParams params;
params.mFilters = std::move(wrFilters.filters);
params.mFilterDatas = std::move(wrFilters.filter_datas);
params.opacity = opacity != 1.0f ? &opacity : nullptr;
params.clip = clip;
if (mWrapsBackdropFilter) {
params.flags |= wr::StackingContextFlags::WRAPS_BACKDROP_FILTER;
}
StackingContextHelper sc(aSc, GetActiveScrolledRoot(), mFrame, this, aBuilder,
params);
nsDisplayEffectsBase::CreateWebRenderCommands(aBuilder, aResources, sc,
aManager, aDisplayListBuilder);
aBuilder.SetInheritedOpacity(opacity);
aBuilder.SetInheritedClipChain(oldClipChain);
return true;
}
#ifdef MOZ_DUMP_PAINTING
void nsDisplayFilters::PrintEffects(nsACString& aTo) {
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(mFrame);
bool first = true;
aTo += " effects=(";
// We may exist for a mix of CSS filter functions and/or references to SVG
// filters. If we have invalid references to SVG filters then we paint
// nothing, but otherwise we will apply one or more filters.
if (SVGObserverUtils::GetAndObserveFilters(firstFrame, nullptr) !=
SVGObserverUtils::eHasRefsSomeInvalid) {
if (!first) {
aTo += ", ";
}
aTo += "filter";
}
aTo += ")";
}
#endif
nsDisplaySVGWrapper::nsDisplaySVGWrapper(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList)
: nsDisplayWrapList(aBuilder, aFrame, aList) {
MOZ_COUNT_CTOR(nsDisplaySVGWrapper);
}
bool nsDisplaySVGWrapper::ShouldFlattenAway(nsDisplayListBuilder* aBuilder) {
return !aBuilder->GetWidgetLayerManager();
}
bool nsDisplaySVGWrapper::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
return CreateWebRenderCommandsNewClipListOption(
aBuilder, aResources, aSc, aManager, aDisplayListBuilder, false);
}
nsDisplayForeignObject::nsDisplayForeignObject(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aList)
: nsDisplayWrapList(aBuilder, aFrame, aList) {
MOZ_COUNT_CTOR(nsDisplayForeignObject);
}
#ifdef NS_BUILD_REFCNT_LOGGING
nsDisplayForeignObject::~nsDisplayForeignObject() {
MOZ_COUNT_DTOR(nsDisplayForeignObject);
}
#endif
bool nsDisplayForeignObject::ShouldFlattenAway(nsDisplayListBuilder* aBuilder) {
return !aBuilder->GetWidgetLayerManager();
}
bool nsDisplayForeignObject::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc, RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
AutoRestore<bool> restoreDoGrouping(aManager->CommandBuilder().mDoGrouping);
aManager->CommandBuilder().mDoGrouping = false;
return CreateWebRenderCommandsNewClipListOption(
aBuilder, aResources, aSc, aManager, aDisplayListBuilder, false);
}
void nsDisplayLink::Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) {
auto appPerDev = mFrame->PresContext()->AppUnitsPerDevPixel();
aCtx->GetDrawTarget()->Link(
mLinkSpec.get(), NSRectToRect(GetPaintRect(aBuilder, aCtx), appPerDev));
}
void nsDisplayDestination::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
auto appPerDev = mFrame->PresContext()->AppUnitsPerDevPixel();
aCtx->GetDrawTarget()->Destination(
mDestinationName.get(),
NSPointToPoint(GetPaintRect(aBuilder, aCtx).TopLeft(), appPerDev));
}
void nsDisplayListCollection::SerializeWithCorrectZOrder(
nsDisplayList* aOutResultList, nsIContent* aContent) {
// Sort PositionedDescendants() in CSS 'z-order' order. The list is already
// in content document order and SortByZOrder is a stable sort which
// guarantees that boxes produced by the same element are placed together
// in the sort. Consider a position:relative inline element that breaks
// across lines and has absolutely positioned children; all the abs-pos
// children should be z-ordered after all the boxes for the position:relative
// element itself.
PositionedDescendants()->SortByZOrder();
// 1,2: backgrounds and borders
aOutResultList->AppendToTop(BorderBackground());
// 3: negative z-index children.
for (auto* item : PositionedDescendants()->TakeItems()) {
if (item->ZIndex() < 0) {
aOutResultList->AppendToTop(item);
} else {
PositionedDescendants()->AppendToTop(item);
}
}
// 4: block backgrounds
aOutResultList->AppendToTop(BlockBorderBackgrounds());
// 5: floats
aOutResultList->AppendToTop(Floats());
// 7: general content
aOutResultList->AppendToTop(Content());
// 7.5: outlines, in content tree order. We need to sort by content order
// because an element with outline that breaks and has children with outline
// might have placed child outline items between its own outline items.
// The element's outline items need to all come before any child outline
// items.
if (aContent) {
Outlines()->SortByContentOrder(aContent);
}
aOutResultList->AppendToTop(Outlines());
// 8, 9: non-negative z-index children
aOutResultList->AppendToTop(PositionedDescendants());
}
uint32_t PaintTelemetry::sPaintLevel = 0;
PaintTelemetry::AutoRecordPaint::AutoRecordPaint() {
// Don't record nested paints.
if (sPaintLevel++ > 0) {
return;
}
mStart = TimeStamp::Now();
}
PaintTelemetry::AutoRecordPaint::~AutoRecordPaint() {
MOZ_ASSERT(sPaintLevel != 0);
if (--sPaintLevel > 0) {
return;
}
// If we're in multi-process mode, don't include paint times for the parent
// process.
if (gfxVars::BrowserTabsRemoteAutostart() && XRE_IsParentProcess()) {
return;
}
// Record the total time.
mozilla::glean::gfx_content::paint_time.AccumulateRawDuration(
TimeStamp::Now() - mStart);
}
static nsIFrame* GetSelfOrPlaceholderFor(nsIFrame* aFrame) {
if (aFrame->HasAnyStateBits(NS_FRAME_IS_PUSHED_FLOAT)) {
return aFrame;
}
if (aFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) &&
!aFrame->GetPrevInFlow()) {
return aFrame->GetPlaceholderFrame();
}
return aFrame;
}
static nsIFrame* GetAncestorFor(nsIFrame* aFrame) {
nsIFrame* f = GetSelfOrPlaceholderFor(aFrame);
MOZ_ASSERT(f);
return nsLayoutUtils::GetCrossDocParentFrameInProcess(f);
}
nsDisplayListBuilder::AutoBuildingDisplayList::AutoBuildingDisplayList(
nsDisplayListBuilder* aBuilder, nsIFrame* aForChild,
const nsRect& aVisibleRect, const nsRect& aDirtyRect,
const bool aIsTransformed)
: mBuilder(aBuilder),
mPrevFrame(aBuilder->mCurrentFrame),
mPrevReferenceFrame(aBuilder->mCurrentReferenceFrame),
mPrevOffset(aBuilder->mCurrentOffsetToReferenceFrame),
mPrevAdditionalOffset(aBuilder->mAdditionalOffset),
mPrevVisibleRect(aBuilder->mVisibleRect),
mPrevDirtyRect(aBuilder->mDirtyRect),
mPrevCompositorHitTestInfo(aBuilder->mCompositorHitTestInfo),
mPrevAncestorHasApzAwareEventHandler(
aBuilder->mAncestorHasApzAwareEventHandler),
mPrevBuildingInvisibleItems(aBuilder->mBuildingInvisibleItems),
mPrevInInvalidSubtree(aBuilder->mInInvalidSubtree) {
if (aIsTransformed) {
aBuilder->mCurrentOffsetToReferenceFrame =
aBuilder->AdditionalOffset().refOr(nsPoint());
aBuilder->mCurrentReferenceFrame = aForChild;
} else if (aBuilder->mCurrentFrame == aForChild->GetParent()) {
aBuilder->mCurrentOffsetToReferenceFrame += aForChild->GetPosition();
} else {
aBuilder->mCurrentReferenceFrame = aBuilder->FindReferenceFrameFor(
aForChild, &aBuilder->mCurrentOffsetToReferenceFrame);
}
// If aForChild is being visited from a frame other than it's ancestor frame,
// mInInvalidSubtree will need to be recalculated the slow way.
if (aForChild == mPrevFrame || GetAncestorFor(aForChild) == mPrevFrame) {
aBuilder->mInInvalidSubtree =
aBuilder->mInInvalidSubtree || aForChild->IsFrameModified();
} else {
aBuilder->mInInvalidSubtree = AnyContentAncestorModified(aForChild);
}
aBuilder->mCurrentFrame = aForChild;
aBuilder->mVisibleRect = aVisibleRect;
aBuilder->mDirtyRect =
aBuilder->mInInvalidSubtree ? aVisibleRect : aDirtyRect;
}
} // namespace mozilla