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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/RestyleManager.h"
#include "mozilla/AutoRestyleTimelineMarker.h"
#include "mozilla/AutoTimelineMarker.h"
#include "mozilla/ComputedStyle.h"
#include "mozilla/ComputedStyleInlines.h"
#include "mozilla/DocumentStyleRootIterator.h"
#include "mozilla/EffectSet.h"
#include "mozilla/GeckoBindings.h"
#include "mozilla/LayerAnimationInfo.h"
#include "mozilla/layers/AnimationInfo.h"
#include "mozilla/layout/ScrollAnchorContainer.h"
#include "mozilla/PresShell.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/ServoStyleSetInlines.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/SVGIntegrationUtils.h"
#include "mozilla/SVGObserverUtils.h"
#include "mozilla/SVGTextFrame.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/Unused.h"
#include "mozilla/ViewportFrame.h"
#include "mozilla/IntegerRange.h"
#include "mozilla/dom/ChildIterator.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/ElementInlines.h"
#include "mozilla/dom/HTMLBodyElement.h"
#include "Layers.h"
#include "nsAnimationManager.h"
#include "nsBlockFrame.h"
#include "nsBulletFrame.h"
#include "nsContentUtils.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSRendering.h"
#include "nsDocShell.h"
#include "nsIFrame.h"
#include "nsIFrameInlines.h"
#include "nsImageFrame.h"
#include "nsPlaceholderFrame.h"
#include "nsPrintfCString.h"
#include "nsRefreshDriver.h"
#include "nsStyleChangeList.h"
#include "nsStyleUtil.h"
#include "nsTransitionManager.h"
#include "StickyScrollContainer.h"
#include "ActiveLayerTracker.h"
#ifdef ACCESSIBILITY
# include "nsAccessibilityService.h"
#endif
using mozilla::layers::AnimationInfo;
using mozilla::layout::ScrollAnchorContainer;
using namespace mozilla::dom;
using namespace mozilla::layers;
namespace mozilla {
RestyleManager::RestyleManager(nsPresContext* aPresContext)
: mPresContext(aPresContext),
mRestyleGeneration(1),
mUndisplayedRestyleGeneration(1),
mInStyleRefresh(false),
mAnimationGeneration(0) {
MOZ_ASSERT(mPresContext);
}
void RestyleManager::ContentInserted(nsIContent* aChild) {
MOZ_ASSERT(aChild->GetParentNode());
RestyleForInsertOrChange(aChild);
}
void RestyleManager::ContentAppended(nsIContent* aFirstNewContent) {
MOZ_ASSERT(aFirstNewContent->GetParent());
// The container cannot be a document, but might be a ShadowRoot.
if (!aFirstNewContent->GetParentNode()->IsElement()) {
return;
}
Element* container = aFirstNewContent->GetParentNode()->AsElement();
#ifdef DEBUG
{
for (nsIContent* cur = aFirstNewContent; cur; cur = cur->GetNextSibling()) {
NS_ASSERTION(!cur->IsRootOfNativeAnonymousSubtree(),
"anonymous nodes should not be in child lists");
}
}
#endif
uint32_t selectorFlags =
container->GetFlags() &
(NODE_ALL_SELECTOR_FLAGS & ~NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS);
if (selectorFlags == 0) return;
if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) {
// see whether we need to restyle the container
bool wasEmpty = true; // :empty or :-moz-only-whitespace
for (nsIContent* cur = container->GetFirstChild(); cur != aFirstNewContent;
cur = cur->GetNextSibling()) {
// We don't know whether we're testing :empty or :-moz-only-whitespace,
// so be conservative and assume :-moz-only-whitespace (i.e., make
// IsSignificantChild less likely to be true, and thus make us more
// likely to restyle).
if (nsStyleUtil::IsSignificantChild(cur, false)) {
wasEmpty = false;
break;
}
}
if (wasEmpty) {
RestyleForEmptyChange(container);
return;
}
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR) {
PostRestyleEvent(container, RestyleHint::RestyleSubtree(), nsChangeHint(0));
// Restyling the container is the most we can do here, so we're done.
return;
}
if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) {
// restyle the last element child before this node
for (nsIContent* cur = aFirstNewContent->GetPreviousSibling(); cur;
cur = cur->GetPreviousSibling()) {
if (cur->IsElement()) {
PostRestyleEvent(cur->AsElement(), RestyleHint::RestyleSubtree(),
nsChangeHint(0));
break;
}
}
}
}
static void RestyleSiblingsStartingWith(RestyleManager& aRM,
nsIContent* aStartingSibling) {
for (nsIContent* sibling = aStartingSibling; sibling;
sibling = sibling->GetNextSibling()) {
if (auto* element = Element::FromNode(sibling)) {
aRM.PostRestyleEvent(element, RestyleHint::RestyleSubtree(),
nsChangeHint(0));
}
}
}
void RestyleManager::RestyleForEmptyChange(Element* aContainer) {
PostRestyleEvent(aContainer, RestyleHint::RestyleSubtree(), nsChangeHint(0));
// In some cases (:empty + E, :empty ~ E), a change in the content of
// an element requires restyling its parent's siblings.
nsIContent* grandparent = aContainer->GetParent();
if (!grandparent ||
!(grandparent->GetFlags() & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS)) {
return;
}
RestyleSiblingsStartingWith(*this, aContainer->GetNextSibling());
}
void RestyleManager::MaybeRestyleForEdgeChildChange(Element* aContainer,
nsIContent* aChangedChild) {
MOZ_ASSERT(aContainer->GetFlags() & NODE_HAS_EDGE_CHILD_SELECTOR);
MOZ_ASSERT(aChangedChild->GetParent() == aContainer);
// restyle the previously-first element child if it is after this node
bool passedChild = false;
for (nsIContent* content = aContainer->GetFirstChild(); content;
content = content->GetNextSibling()) {
if (content == aChangedChild) {
passedChild = true;
continue;
}
if (content->IsElement()) {
if (passedChild) {
PostRestyleEvent(content->AsElement(), RestyleHint::RestyleSubtree(),
nsChangeHint(0));
}
break;
}
}
// restyle the previously-last element child if it is before this node
passedChild = false;
for (nsIContent* content = aContainer->GetLastChild(); content;
content = content->GetPreviousSibling()) {
if (content == aChangedChild) {
passedChild = true;
continue;
}
if (content->IsElement()) {
if (passedChild) {
PostRestyleEvent(content->AsElement(), RestyleHint::RestyleSubtree(),
nsChangeHint(0));
}
break;
}
}
}
template <typename CharT>
bool WhitespaceOnly(const CharT* aBuffer, size_t aUpTo) {
for (auto index : IntegerRange(aUpTo)) {
if (!dom::IsSpaceCharacter(aBuffer[index])) {
return false;
}
}
return true;
}
template <typename CharT>
bool WhitespaceOnlyChangedOnAppend(const CharT* aBuffer, size_t aOldLength,
size_t aNewLength) {
MOZ_ASSERT(aOldLength <= aNewLength);
if (!WhitespaceOnly(aBuffer, aOldLength)) {
// The old text was already not whitespace-only.
return false;
}
return !WhitespaceOnly(aBuffer + aOldLength, aNewLength - aOldLength);
}
static bool HasAnySignificantSibling(Element* aContainer, nsIContent* aChild) {
MOZ_ASSERT(aChild->GetParent() == aContainer);
for (nsIContent* child = aContainer->GetFirstChild(); child;
child = child->GetNextSibling()) {
if (child == aChild) {
continue;
}
// We don't know whether we're testing :empty or :-moz-only-whitespace,
// so be conservative and assume :-moz-only-whitespace (i.e., make
// IsSignificantChild less likely to be true, and thus make us more
// likely to restyle).
if (nsStyleUtil::IsSignificantChild(child, false)) {
return true;
}
}
return false;
}
void RestyleManager::CharacterDataChanged(
nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {
nsINode* parent = aContent->GetParentNode();
MOZ_ASSERT(parent, "How were we notified of a stray node?");
uint32_t slowSelectorFlags = parent->GetFlags() & NODE_ALL_SELECTOR_FLAGS;
if (!(slowSelectorFlags &
(NODE_HAS_EMPTY_SELECTOR | NODE_HAS_EDGE_CHILD_SELECTOR))) {
// Nothing to do, no other slow selector can change as a result of this.
return;
}
if (!aContent->IsText()) {
// Doesn't matter to styling (could be a processing instruction or a
// comment), it can't change whether any selectors match or don't.
return;
}
if (MOZ_UNLIKELY(!parent->IsElement())) {
MOZ_ASSERT(parent->IsShadowRoot());
return;
}
if (MOZ_UNLIKELY(aContent->IsRootOfNativeAnonymousSubtree())) {
// This is an anonymous node and thus isn't in child lists, so isn't taken
// into account for selector matching the relevant selectors here.
return;
}
// Handle appends specially since they're common and we can know both the old
// and the new text exactly.
//
// TODO(emilio): This could be made much more general if :-moz-only-whitespace
// / :-moz-first-node and :-moz-last-node didn't exist. In that case we only
// need to know whether we went from empty to non-empty, and that's trivial to
// know, with CharacterDataChangeInfo...
if (!aInfo.mAppend) {
// FIXME(emilio): This restyles unnecessarily if the text node is the only
// child of the parent element. Fortunately, it's uncommon to have such
// nodes and this not being an append.
//
// See the testcase in bug 1427625 for a test-case that triggers this.
RestyleForInsertOrChange(aContent);
return;
}
const nsTextFragment* text = &aContent->AsText()->TextFragment();
const size_t oldLength = aInfo.mChangeStart;
const size_t newLength = text->GetLength();
const bool emptyChanged = !oldLength && newLength;
const bool whitespaceOnlyChanged =
text->Is2b()
? WhitespaceOnlyChangedOnAppend(text->Get2b(), oldLength, newLength)
: WhitespaceOnlyChangedOnAppend(text->Get1b(), oldLength, newLength);
if (!emptyChanged && !whitespaceOnlyChanged) {
return;
}
if (slowSelectorFlags & NODE_HAS_EMPTY_SELECTOR) {
if (!HasAnySignificantSibling(parent->AsElement(), aContent)) {
// We used to be empty, restyle the parent.
RestyleForEmptyChange(parent->AsElement());
return;
}
}
if (slowSelectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) {
MaybeRestyleForEdgeChildChange(parent->AsElement(), aContent);
}
}
// Restyling for a ContentInserted or CharacterDataChanged notification.
// This could be used for ContentRemoved as well if we got the
// notification before the removal happened (and sometimes
// CharacterDataChanged is more like a removal than an addition).
// The comments are written and variables are named in terms of it being
// a ContentInserted notification.
void RestyleManager::RestyleForInsertOrChange(nsIContent* aChild) {
nsINode* parentNode = aChild->GetParentNode();
MOZ_ASSERT(parentNode);
// The container might be a document or a ShadowRoot.
if (!parentNode->IsElement()) {
return;
}
Element* container = parentNode->AsElement();
NS_ASSERTION(!aChild->IsRootOfNativeAnonymousSubtree(),
"anonymous nodes should not be in child lists");
uint32_t selectorFlags = container->GetFlags() & NODE_ALL_SELECTOR_FLAGS;
if (selectorFlags == 0) return;
if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) {
// See whether we need to restyle the container due to :empty /
// :-moz-only-whitespace.
const bool wasEmpty = !HasAnySignificantSibling(container, aChild);
if (wasEmpty) {
// FIXME(emilio): When coming from CharacterDataChanged this can restyle
// unnecessarily. Also can restyle unnecessarily if aChild is not
// significant anyway, though that's more unlikely.
RestyleForEmptyChange(container);
return;
}
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR) {
PostRestyleEvent(container, RestyleHint::RestyleSubtree(), nsChangeHint(0));
// Restyling the container is the most we can do here, so we're done.
return;
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS) {
// Restyle all later siblings.
RestyleSiblingsStartingWith(*this, aChild->GetNextSibling());
}
if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) {
MaybeRestyleForEdgeChildChange(container, aChild);
}
}
void RestyleManager::ContentRemoved(nsIContent* aOldChild,
nsIContent* aFollowingSibling) {
MOZ_ASSERT(aOldChild->GetParentNode());
// Computed style data isn't useful for detached nodes, and we'll need to
// recompute it anyway if we ever insert the nodes back into a document.
if (aOldChild->IsElement()) {
RestyleManager::ClearServoDataFromSubtree(aOldChild->AsElement());
}
// The container might be a document or a ShadowRoot.
if (!aOldChild->GetParentNode()->IsElement()) {
return;
}
Element* container = aOldChild->GetParentNode()->AsElement();
if (aOldChild->IsRootOfNativeAnonymousSubtree()) {
// This should be an assert, but this is called incorrectly in
// HTMLEditor::DeleteRefToAnonymousNode and the assertions were clogging
// up the logs. Make it an assert again when that's fixed.
MOZ_ASSERT(aOldChild->GetProperty(nsGkAtoms::restylableAnonymousNode),
"anonymous nodes should not be in child lists (bug 439258)");
}
uint32_t selectorFlags = container->GetFlags() & NODE_ALL_SELECTOR_FLAGS;
if (selectorFlags == 0) return;
if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) {
// see whether we need to restyle the container
bool isEmpty = true; // :empty or :-moz-only-whitespace
for (nsIContent* child = container->GetFirstChild(); child;
child = child->GetNextSibling()) {
// We don't know whether we're testing :empty or :-moz-only-whitespace,
// so be conservative and assume :-moz-only-whitespace (i.e., make
// IsSignificantChild less likely to be true, and thus make us more
// likely to restyle).
if (nsStyleUtil::IsSignificantChild(child, false)) {
isEmpty = false;
break;
}
}
if (isEmpty) {
RestyleForEmptyChange(container);
return;
}
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR) {
PostRestyleEvent(container, RestyleHint::RestyleSubtree(), nsChangeHint(0));
// Restyling the container is the most we can do here, so we're done.
return;
}
if (selectorFlags & NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS) {
// Restyle all later siblings.
RestyleSiblingsStartingWith(*this, aFollowingSibling);
}
if (selectorFlags & NODE_HAS_EDGE_CHILD_SELECTOR) {
// restyle the now-first element child if it was after aOldChild
bool reachedFollowingSibling = false;
for (nsIContent* content = container->GetFirstChild(); content;
content = content->GetNextSibling()) {
if (content == aFollowingSibling) {
reachedFollowingSibling = true;
// do NOT continue here; we might want to restyle this node
}
if (content->IsElement()) {
if (reachedFollowingSibling) {
PostRestyleEvent(content->AsElement(), RestyleHint::RestyleSubtree(),
nsChangeHint(0));
}
break;
}
}
// restyle the now-last element child if it was before aOldChild
reachedFollowingSibling = (aFollowingSibling == nullptr);
for (nsIContent* content = container->GetLastChild(); content;
content = content->GetPreviousSibling()) {
if (content->IsElement()) {
if (reachedFollowingSibling) {
PostRestyleEvent(content->AsElement(), RestyleHint::RestyleSubtree(),
nsChangeHint(0));
}
break;
}
if (content == aFollowingSibling) {
reachedFollowingSibling = true;
}
}
}
}
static bool StateChangeMayAffectFrame(const Element& aElement,
const nsIFrame& aFrame,
EventStates aStates) {
if (aFrame.IsGeneratedContentFrame()) {
// If it's generated content, ignore LOADING/etc state changes on it.
return false;
}
const bool brokenChanged = aStates.HasState(NS_EVENT_STATE_BROKEN);
const bool loadingChanged = aStates.HasState(NS_EVENT_STATE_LOADING);
if (!brokenChanged && !loadingChanged) {
return false;
}
if (aElement.IsHTMLElement(nsGkAtoms::img)) {
// Loading state doesn't affect <img>, see
// `nsImageFrame::ShouldCreateImageFrameFor`.
return brokenChanged;
}
return brokenChanged || loadingChanged;
}
/**
* Calculates the change hint and the restyle hint for a given content state
* change.
*/
static nsChangeHint ChangeForContentStateChange(const Element& aElement,
EventStates aStateMask) {
auto changeHint = nsChangeHint(0);
// Any change to a content state that affects which frames we construct
// must lead to a frame reconstruct here if we already have a frame.
// Note that we never decide through non-CSS means to not create frames
// based on content states, so if we already don't have a frame we don't
// need to force a reframe -- if it's needed, the HasStateDependentStyle
// call will handle things.
if (nsIFrame* primaryFrame = aElement.GetPrimaryFrame()) {
if (StateChangeMayAffectFrame(aElement, *primaryFrame, aStateMask)) {
return nsChangeHint_ReconstructFrame;
}
StyleAppearance appearance =
primaryFrame->StyleDisplay()->EffectiveAppearance();
if (appearance != StyleAppearance::None) {
nsPresContext* pc = primaryFrame->PresContext();
nsITheme* theme = pc->Theme();
if (theme->ThemeSupportsWidget(pc, primaryFrame, appearance)) {
bool repaint = false;
theme->WidgetStateChanged(primaryFrame, appearance, nullptr, &repaint,
nullptr);
if (repaint) {
changeHint |= nsChangeHint_RepaintFrame;
}
}
}
primaryFrame->ContentStatesChanged(aStateMask);
}
if (aStateMask.HasState(NS_EVENT_STATE_VISITED)) {
// Exposing information to the page about whether the link is
// visited or not isn't really something we can worry about here.
// FIXME: We could probably do this a bit better.
changeHint |= nsChangeHint_RepaintFrame;
}
return changeHint;
}
#ifdef DEBUG
/* static */
nsCString RestyleManager::ChangeHintToString(nsChangeHint aHint) {
nsCString result;
bool any = false;
const char* names[] = {"RepaintFrame",
"NeedReflow",
"ClearAncestorIntrinsics",
"ClearDescendantIntrinsics",
"NeedDirtyReflow",
"UpdateCursor",
"UpdateEffects",
"UpdateOpacityLayer",
"UpdateTransformLayer",
"ReconstructFrame",
"UpdateOverflow",
"UpdateSubtreeOverflow",
"UpdatePostTransformOverflow",
"UpdateParentOverflow",
"ChildrenOnlyTransform",
"RecomputePosition",
"UpdateContainingBlock",
"BorderStyleNoneChange",
"SchedulePaint",
"NeutralChange",
"InvalidateRenderingObservers",
"ReflowChangesSizeOrPosition",
"UpdateComputedBSize",
"UpdateUsesOpacity",
"UpdateBackgroundPosition",
"AddOrRemoveTransform",
"ScrollbarChange",
"UpdateTableCellSpans",
"VisibilityChange"};
static_assert(nsChangeHint_AllHints ==
static_cast<uint32_t>((1ull << ArrayLength(names)) - 1),
"Name list doesn't match change hints.");
uint32_t hint =
aHint & static_cast<uint32_t>((1ull << ArrayLength(names)) - 1);
uint32_t rest =
aHint & ~static_cast<uint32_t>((1ull << ArrayLength(names)) - 1);
if ((hint & NS_STYLE_HINT_REFLOW) == NS_STYLE_HINT_REFLOW) {
result.AppendLiteral("NS_STYLE_HINT_REFLOW");
hint = hint & ~NS_STYLE_HINT_REFLOW;
any = true;
} else if ((hint & nsChangeHint_AllReflowHints) ==
nsChangeHint_AllReflowHints) {
result.AppendLiteral("nsChangeHint_AllReflowHints");
hint = hint & ~nsChangeHint_AllReflowHints;
any = true;
} else if ((hint & NS_STYLE_HINT_VISUAL) == NS_STYLE_HINT_VISUAL) {
result.AppendLiteral("NS_STYLE_HINT_VISUAL");
hint = hint & ~NS_STYLE_HINT_VISUAL;
any = true;
}
for (uint32_t i = 0; i < ArrayLength(names); i++) {
if (hint & (1u << i)) {
if (any) {
result.AppendLiteral(" | ");
}
result.AppendPrintf("nsChangeHint_%s", names[i]);
any = true;
}
}
if (rest) {
if (any) {
result.AppendLiteral(" | ");
}
result.AppendPrintf("0x%0x", rest);
} else {
if (!any) {
result.AppendLiteral("nsChangeHint(0)");
}
}
return result;
}
#endif
/**
* Frame construction helpers follow.
*/
#ifdef DEBUG
static bool gInApplyRenderingChangeToTree = false;
#endif
/**
* Sync views on the frame and all of it's descendants (following placeholders).
* The change hint should be some combination of nsChangeHint_RepaintFrame,
* nsChangeHint_UpdateOpacityLayer and nsChangeHint_SchedulePaint, nothing else.
*/
static void SyncViewsAndInvalidateDescendants(nsIFrame*, nsChangeHint);
static void StyleChangeReflow(nsIFrame* aFrame, nsChangeHint aHint);
/**
* This helper function is used to find the correct SVG frame to target when we
* encounter nsChangeHint_ChildrenOnlyTransform; needed since sometimes we end
* up handling that hint while processing hints for one of the SVG frame's
* ancestor frames.
*
* The reason that we sometimes end up trying to process the hint for an
* ancestor of the SVG frame that the hint is intended for is due to the way we
* process restyle events. ApplyRenderingChangeToTree adjusts the frame from
* the restyled element's principle frame to one of its ancestor frames based
* on what nsCSSRendering::FindBackground returns, since the background style
* may have been propagated up to an ancestor frame. Processing hints using an
* ancestor frame is fine in general, but nsChangeHint_ChildrenOnlyTransform is
* a special case since it is intended to update a specific frame.
*/
static nsIFrame* GetFrameForChildrenOnlyTransformHint(nsIFrame* aFrame) {
if (aFrame->IsViewportFrame()) {
// This happens if the root-<svg> is fixed positioned, in which case we
// can't use aFrame->GetContent() to find the primary frame, since
// GetContent() returns nullptr for ViewportFrame.
aFrame = aFrame->PrincipalChildList().FirstChild();
}
// For an nsHTMLScrollFrame, this will get the SVG frame that has the
// children-only transforms:
aFrame = aFrame->GetContent()->GetPrimaryFrame();
if (aFrame->IsSVGOuterSVGFrame()) {
aFrame = aFrame->PrincipalChildList().FirstChild();
MOZ_ASSERT(aFrame->IsSVGOuterSVGAnonChildFrame(),
"Where is the SVGOuterSVGFrame's anon child??");
}
MOZ_ASSERT(aFrame->IsFrameOfType(nsIFrame::eSVG | nsIFrame::eSVGContainer),
"Children-only transforms only expected on SVG frames");
return aFrame;
}
// This function tries to optimize a position style change by either
// moving aFrame or ignoring the style change when it's safe to do so.
// It returns true when that succeeds, otherwise it posts a reflow request
// and returns false.
static bool RecomputePosition(nsIFrame* aFrame) {
// It's pointless to move around frames that have never been reflowed or
// are dirty (i.e. they will be reflowed).
if (aFrame->HasAnyStateBits(NS_FRAME_FIRST_REFLOW | NS_FRAME_IS_DIRTY)) {
return true;
}
// Don't process position changes on table frames, since we already handle
// the dynamic position change on the table wrapper frame, and the
// reflow-based fallback code path also ignores positions on inner table
// frames.
if (aFrame->IsTableFrame()) {
return true;
}
const nsStyleDisplay* display = aFrame->StyleDisplay();
// Changes to the offsets of a non-positioned element can safely be ignored.
if (display->mPosition == StylePositionProperty::Static) {
return true;
}
// Don't process position changes on frames which have views or the ones which
// have a view somewhere in their descendants, because the corresponding view
// needs to be repositioned properly as well.
if (aFrame->HasView() ||
aFrame->HasAnyStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW)) {
return false;
}
// Flexbox and Grid layout supports CSS Align and the optimizations below
// don't support that yet.
if (aFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
nsIFrame* ph = aFrame->GetPlaceholderFrame();
if (ph && ph->HasAnyStateBits(PLACEHOLDER_STATICPOS_NEEDS_CSSALIGN)) {
return false;
}
}
// If we need to reposition any descendant that depends on our static
// position, then we also can't take the optimized path.
//
// TODO(emilio): It may be worth trying to find them and try to call
// RecomputePosition on them too instead of disabling the optimization...
if (aFrame->DescendantMayDependOnItsStaticPosition()) {
return false;
}
aFrame->SchedulePaint();
// For relative positioning, we can simply update the frame rect
if (display->IsRelativelyPositionedStyle()) {
if (aFrame->IsGridItem()) {
// A grid item's CB is its grid area, not the parent frame content area
// as is assumed below.
return false;
}
// Move the frame
if (display->mPosition == StylePositionProperty::Sticky) {
// Update sticky positioning for an entire element at once, starting with
// the first continuation or ib-split sibling.
// It's rare that the frame we already have isn't already the first
// continuation or ib-split sibling, but it can happen when styles differ
// across continuations such as ::first-line or ::first-letter, and in
// those cases we will generally (but maybe not always) do the work twice.
nsIFrame* firstContinuation =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aFrame);
StickyScrollContainer::ComputeStickyOffsets(firstContinuation);
StickyScrollContainer* ssc =
StickyScrollContainer::GetStickyScrollContainerForFrame(
firstContinuation);
if (ssc) {
ssc->PositionContinuations(firstContinuation);
}
} else {
MOZ_ASSERT(StylePositionProperty::Relative == display->mPosition,
"Unexpected type of positioning");
for (nsIFrame* cont = aFrame; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
nsIFrame* cb = cont->GetContainingBlock();
nsMargin newOffsets;
WritingMode wm = cb->GetWritingMode();
const LogicalSize size = cb->ContentSize();
ReflowInput::ComputeRelativeOffsets(wm, cont, size, newOffsets);
NS_ASSERTION(newOffsets.left == -newOffsets.right &&
newOffsets.top == -newOffsets.bottom,
"ComputeRelativeOffsets should return valid results");
// ReflowInput::ApplyRelativePositioning would work here, but
// since we've already checked mPosition and aren't changing the frame's
// normal position, go ahead and add the offsets directly.
// First, we need to ensure that the normal position is stored though.
bool hasProperty;
nsPoint normalPosition = cont->GetNormalPosition(&hasProperty);
if (!hasProperty) {
cont->AddProperty(nsIFrame::NormalPositionProperty(),
new nsPoint(normalPosition));
}
cont->SetPosition(normalPosition +
nsPoint(newOffsets.left, newOffsets.top));
}
}
if (aFrame->IsInScrollAnchorChain()) {
ScrollAnchorContainer* container = ScrollAnchorContainer::FindFor(aFrame);
aFrame->PresShell()->PostPendingScrollAnchorAdjustment(container);
}
return true;
}
// For the absolute positioning case, set up a fake HTML reflow input for
// the frame, and then get the offsets and size from it. If the frame's size
// doesn't need to change, we can simply update the frame position. Otherwise
// we fall back to a reflow.
RefPtr<gfxContext> rc =
aFrame->PresShell()->CreateReferenceRenderingContext();
// Construct a bogus parent reflow input so that there's a usable
// containing block reflow input.
nsIFrame* parentFrame = aFrame->GetParent();
WritingMode parentWM = parentFrame->GetWritingMode();
WritingMode frameWM = aFrame->GetWritingMode();
LogicalSize parentSize = parentFrame->GetLogicalSize();
nsFrameState savedState = parentFrame->GetStateBits();
ReflowInput parentReflowInput(aFrame->PresContext(), parentFrame, rc,
parentSize);
parentFrame->RemoveStateBits(~nsFrameState(0));
parentFrame->AddStateBits(savedState);
// The bogus parent state here was created with no parent state of its own,
// and therefore it won't have an mCBReflowInput set up.
// But we may need one (for InitCBReflowInput in a child state), so let's
// try to create one here for the cases where it will be needed.
Maybe<ReflowInput> cbReflowInput;
nsIFrame* cbFrame = parentFrame->GetContainingBlock();
if (cbFrame && (aFrame->GetContainingBlock() != parentFrame ||
parentFrame->IsTableFrame())) {
LogicalSize cbSize = cbFrame->GetLogicalSize();
cbReflowInput.emplace(cbFrame->PresContext(), cbFrame, rc, cbSize);
cbReflowInput->ComputedPhysicalMargin() = cbFrame->GetUsedMargin();
cbReflowInput->ComputedPhysicalPadding() = cbFrame->GetUsedPadding();
cbReflowInput->ComputedPhysicalBorderPadding() =
cbFrame->GetUsedBorderAndPadding();
parentReflowInput.mCBReflowInput = cbReflowInput.ptr();
}
NS_WARNING_ASSERTION(parentSize.ISize(parentWM) != NS_UNCONSTRAINEDSIZE &&
parentSize.BSize(parentWM) != NS_UNCONSTRAINEDSIZE,
"parentSize should be valid");
parentReflowInput.SetComputedISize(std::max(parentSize.ISize(parentWM), 0));
parentReflowInput.SetComputedBSize(std::max(parentSize.BSize(parentWM), 0));
parentReflowInput.ComputedPhysicalMargin().SizeTo(0, 0, 0, 0);
parentReflowInput.ComputedPhysicalPadding() = parentFrame->GetUsedPadding();
parentReflowInput.ComputedPhysicalBorderPadding() =
parentFrame->GetUsedBorderAndPadding();
LogicalSize availSize = parentSize.ConvertTo(frameWM, parentWM);
availSize.BSize(frameWM) = NS_UNCONSTRAINEDSIZE;
ViewportFrame* viewport = do_QueryFrame(parentFrame);
nsSize cbSize =
viewport
? viewport->AdjustReflowInputAsContainingBlock(&parentReflowInput)
.Size()
: aFrame->GetContainingBlock()->GetSize();
const nsMargin& parentBorder =
parentReflowInput.mStyleBorder->GetComputedBorder();
cbSize -= nsSize(parentBorder.LeftRight(), parentBorder.TopBottom());
LogicalSize lcbSize(frameWM, cbSize);
ReflowInput reflowInput(aFrame->PresContext(), parentReflowInput, aFrame,
availSize, Some(lcbSize));
nscoord computedISize = reflowInput.ComputedISize();
nscoord computedBSize = reflowInput.ComputedBSize();
computedISize +=
reflowInput.ComputedLogicalBorderPadding().IStartEnd(frameWM);
if (computedBSize != NS_UNCONSTRAINEDSIZE) {
computedBSize +=
reflowInput.ComputedLogicalBorderPadding().BStartEnd(frameWM);
}
LogicalSize logicalSize = aFrame->GetLogicalSize(frameWM);
nsSize size = aFrame->GetSize();
// The RecomputePosition hint is not used if any offset changed between auto
// and non-auto. If computedSize.height == NS_UNCONSTRAINEDSIZE then the new
// element height will be its intrinsic height, and since 'top' and 'bottom''s
// auto-ness hasn't changed, the old height must also be its intrinsic
// height, which we can assume hasn't changed (or reflow would have
// been triggered).
if (computedISize == logicalSize.ISize(frameWM) &&
(computedBSize == NS_UNCONSTRAINEDSIZE ||
computedBSize == logicalSize.BSize(frameWM))) {
// If we're solving for 'left' or 'top', then compute it here, in order to
// match the reflow code path.
//
// TODO(emilio): It'd be nice if this did logical math instead, but it seems
// to me the math should work out on vertical writing modes as well.
if (NS_AUTOOFFSET == reflowInput.ComputedPhysicalOffsets().left) {
reflowInput.ComputedPhysicalOffsets().left =
cbSize.width - reflowInput.ComputedPhysicalOffsets().right -
reflowInput.ComputedPhysicalMargin().right - size.width -
reflowInput.ComputedPhysicalMargin().left;
}
if (NS_AUTOOFFSET == reflowInput.ComputedPhysicalOffsets().top) {
reflowInput.ComputedPhysicalOffsets().top =
cbSize.height - reflowInput.ComputedPhysicalOffsets().bottom -
reflowInput.ComputedPhysicalMargin().bottom - size.height -
reflowInput.ComputedPhysicalMargin().top;
}
// Move the frame
nsPoint pos(parentBorder.left + reflowInput.ComputedPhysicalOffsets().left +
reflowInput.ComputedPhysicalMargin().left,
parentBorder.top + reflowInput.ComputedPhysicalOffsets().top +
reflowInput.ComputedPhysicalMargin().top);
aFrame->SetPosition(pos);
if (aFrame->IsInScrollAnchorChain()) {
ScrollAnchorContainer* container = ScrollAnchorContainer::FindFor(aFrame);
aFrame->PresShell()->PostPendingScrollAnchorAdjustment(container);
}
return true;
}
// Fall back to a reflow
return false;
}
static bool HasBoxAncestor(nsIFrame* aFrame) {
for (nsIFrame* f = aFrame; f; f = f->GetParent()) {
if (f->IsXULBoxFrame()) {
return true;
}
}
return false;
}
/**
* Return true if aFrame's subtree has placeholders for out-of-flow content
* that would be affected due to the change to
* `aPossiblyChangingContainingBlock` (and thus would need to get reframed).
*
* In particular, this function returns true if there are placeholders whose OOF
* frames may need to be reparented (via reframing) as a result of whatever
* change actually happened.
*
* The `aIs{Abs,Fixed}PosContainingBlock` params represent whether
* `aPossiblyChangingContainingBlock` is a containing block for abs pos / fixed
* pos stuff, respectively, for the _new_ style that the frame already has, not
* the old one.
*/
static bool ContainingBlockChangeAffectsDescendants(
nsIFrame* aPossiblyChangingContainingBlock, nsIFrame* aFrame,
bool aIsAbsPosContainingBlock, bool aIsFixedPosContainingBlock) {
// All fixed-pos containing blocks should also be abs-pos containing blocks.
MOZ_ASSERT_IF(aIsFixedPosContainingBlock, aIsAbsPosContainingBlock);
for (const auto& childList : aFrame->ChildLists()) {
for (nsIFrame* f : childList.mList) {
if (f->IsPlaceholderFrame()) {
nsIFrame* outOfFlow = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
// If SVG text frames could appear here, they could confuse us since
// they ignore their position style ... but they can't.
NS_ASSERTION(!SVGUtils::IsInSVGTextSubtree(outOfFlow),
"SVG text frames can't be out of flow");
auto* display = outOfFlow->StyleDisplay();
if (display->IsAbsolutelyPositionedStyle()) {
const bool isContainingBlock =
aIsFixedPosContainingBlock ||
(aIsAbsPosContainingBlock &&
display->mPosition == StylePositionProperty::Absolute);
// NOTE(emilio): aPossiblyChangingContainingBlock is guaranteed to be
// a first continuation, see the assertion in the caller.
nsIFrame* parent = outOfFlow->GetParent()->FirstContinuation();
if (isContainingBlock) {
// If we are becoming a containing block, we only need to reframe if
// this oof's current containing block is an ancestor of the new
// frame.
if (parent != aPossiblyChangingContainingBlock &&
nsLayoutUtils::IsProperAncestorFrame(
parent, aPossiblyChangingContainingBlock)) {
return true;
}
} else {
// If we are not a containing block anymore, we only need to reframe
// if we are the current containing block of the oof frame.
if (parent == aPossiblyChangingContainingBlock) {
return true;
}
}
}
}
// NOTE: It's tempting to check f->IsAbsPosContainingBlock() or
// f->IsFixedPosContainingBlock() here. However, that would only
// be testing the *new* style of the frame, which might exclude
// descendants that currently have this frame as an abs-pos
// containing block. Taking the codepath where we don't reframe
// could lead to an unsafe call to
// cont->MarkAsNotAbsoluteContainingBlock() before we've reframed
// the descendant and taken it off the absolute list.
if (ContainingBlockChangeAffectsDescendants(
aPossiblyChangingContainingBlock, f, aIsAbsPosContainingBlock,
aIsFixedPosContainingBlock)) {
return true;
}
}
}
return false;
}
static bool NeedToReframeToUpdateContainingBlock(nsIFrame* aFrame) {
// NOTE: This looks at the new style.
const bool isFixedContainingBlock = aFrame->IsFixedPosContainingBlock();
MOZ_ASSERT_IF(isFixedContainingBlock, aFrame->IsAbsPosContainingBlock());
const bool isAbsPosContainingBlock =
isFixedContainingBlock || aFrame->IsAbsPosContainingBlock();
for (nsIFrame* f = aFrame; f;
f = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(f)) {
if (ContainingBlockChangeAffectsDescendants(
aFrame, f, isAbsPosContainingBlock, isFixedContainingBlock)) {
return true;
}
}
return false;
}
static void DoApplyRenderingChangeToTree(nsIFrame* aFrame,
nsChangeHint aChange) {
MOZ_ASSERT(gInApplyRenderingChangeToTree,
"should only be called within ApplyRenderingChangeToTree");
for (; aFrame;
aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame)) {
// Invalidate and sync views on all descendant frames, following
// placeholders. We don't need to update transforms in
// SyncViewsAndInvalidateDescendants, because there can't be any
// out-of-flows or popups that need to be transformed; all out-of-flow
// descendants of the transformed element must also be descendants of the
// transformed frame.
SyncViewsAndInvalidateDescendants(
aFrame, nsChangeHint(aChange & (nsChangeHint_RepaintFrame |
nsChangeHint_UpdateOpacityLayer |
nsChangeHint_SchedulePaint)));
// This must be set to true if the rendering change needs to
// invalidate content. If it's false, a composite-only paint
// (empty transaction) will be scheduled.
bool needInvalidatingPaint = false;
// if frame has view, will already be invalidated
if (aChange & nsChangeHint_RepaintFrame) {
// Note that this whole block will be skipped when painting is suppressed
// (due to our caller ApplyRendingChangeToTree() discarding the
// nsChangeHint_RepaintFrame hint). If you add handling for any other
// hints within this block, be sure that they too should be ignored when
// painting is suppressed.
needInvalidatingPaint = true;
aFrame->InvalidateFrameSubtree();
if ((aChange & nsChangeHint_UpdateEffects) &&
aFrame->IsFrameOfType(nsIFrame::eSVG) &&
!aFrame->IsSVGOuterSVGFrame()) {
// Need to update our overflow rects:
SVGUtils::ScheduleReflowSVG(aFrame);
}
ActiveLayerTracker::NotifyNeedsRepaint(aFrame);
}
if (aChange & nsChangeHint_UpdateOpacityLayer) {
// FIXME/bug 796697: we can get away with empty transactions for
// opacity updates in many cases.
needInvalidatingPaint = true;
ActiveLayerTracker::NotifyRestyle(aFrame, eCSSProperty_opacity);
if (SVGIntegrationUtils::UsingEffectsForFrame(aFrame)) {
// SVG effects paints the opacity without using
// nsDisplayOpacity. We need to invalidate manually.
aFrame->InvalidateFrameSubtree();
}
}
if ((aChange & nsChangeHint_UpdateTransformLayer) &&
aFrame->IsTransformed()) {
// Note: All the transform-like properties should map to the same
// layer activity index, so does the restyle count. Therefore, using
// eCSSProperty_transform should be fine.
ActiveLayerTracker::NotifyRestyle(aFrame, eCSSProperty_transform);
// If we're not already going to do an invalidating paint, see
// if we can get away with only updating the transform on a
// layer for this frame, and not scheduling an invalidating
// paint.
if (!needInvalidatingPaint) {
nsDisplayItem::Layer* layer;
needInvalidatingPaint |= !aFrame->TryUpdateTransformOnly(&layer);
if (!needInvalidatingPaint) {
// Since we're not going to paint, we need to resend animation
// data to the layer.
MOZ_ASSERT(layer, "this can't happen if there's no layer");
nsDisplayListBuilder::AddAnimationsAndTransitionsToLayer(
layer, nullptr, nullptr, aFrame, DisplayItemType::TYPE_TRANSFORM);
}
}
}
if (aChange & nsChangeHint_ChildrenOnlyTransform) {
needInvalidatingPaint = true;
nsIFrame* childFrame = GetFrameForChildrenOnlyTransformHint(aFrame)
->PrincipalChildList()
.FirstChild();
for (; childFrame; childFrame = childFrame->GetNextSibling()) {
// Note: All the transform-like properties should map to the same
// layer activity index, so does the restyle count. Therefore, using
// eCSSProperty_transform should be fine.
ActiveLayerTracker::NotifyRestyle(childFrame, eCSSProperty_transform);
}
}
if (aChange & nsChangeHint_SchedulePaint) {
needInvalidatingPaint = true;
}
aFrame->SchedulePaint(needInvalidatingPaint
? nsIFrame::PAINT_DEFAULT
: nsIFrame::PAINT_COMPOSITE_ONLY);
}
}
static void SyncViewsAndInvalidateDescendants(nsIFrame* aFrame,
nsChangeHint aChange) {
MOZ_ASSERT(gInApplyRenderingChangeToTree,
"should only be called within ApplyRenderingChangeToTree");
NS_ASSERTION(nsChangeHint_size_t(aChange) ==
(aChange & (nsChangeHint_RepaintFrame |
nsChangeHint_UpdateOpacityLayer |
nsChangeHint_SchedulePaint)),
"Invalid change flag");
aFrame->SyncFrameViewProperties();
for (const auto& [list, listID] : aFrame->ChildLists()) {
for (nsIFrame* child : list) {
if (!child->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
// only do frames that don't have placeholders
if (child->IsPlaceholderFrame()) {
// do the out-of-flow frame and its continuations
nsIFrame* outOfFlowFrame =
nsPlaceholderFrame::GetRealFrameForPlaceholder(child);
DoApplyRenderingChangeToTree(outOfFlowFrame, aChange);
} else if (listID == nsIFrame::kPopupList) {
DoApplyRenderingChangeToTree(child, aChange);
} else { // regular frame
SyncViewsAndInvalidateDescendants(child, aChange);
}
}
}
}
}
static void ApplyRenderingChangeToTree(PresShell* aPresShell, nsIFrame* aFrame,
nsChangeHint aChange) {
// We check StyleDisplay()->HasTransformStyle() in addition to checking
// IsTransformed() since we can get here for some frames that don't support
// CSS transforms, and table frames, which are their own odd-ball, since the
// transform is handled by their wrapper, which _also_ gets a separate hint.
NS_ASSERTION(!(aChange & nsChangeHint_UpdateTransformLayer) ||
aFrame->IsTransformed() ||
aFrame->StyleDisplay()->HasTransformStyle(),
"Unexpected UpdateTransformLayer hint");
if (aPresShell->IsPaintingSuppressed()) {
// Don't allow synchronous rendering changes when painting is turned off.
aChange &= ~nsChangeHint_RepaintFrame;
if (!aChange) {
return;
}
}
// Trigger rendering updates by damaging this frame and any
// continuations of this frame.
#ifdef DEBUG
gInApplyRenderingChangeToTree = true;
#endif
if (aChange & nsChangeHint_RepaintFrame) {
// If the frame is the primary frame of either the body element or
// the html element, we propagate the repaint change hint to the
// viewport. This is necessary for background and scrollbar colors
// propagation.
if (aFrame->IsPrimaryFrameOfRootOrBodyElement()) {
nsIFrame* rootFrame = aPresShell->GetRootFrame();
MOZ_ASSERT(rootFrame, "No root frame?");
DoApplyRenderingChangeToTree(rootFrame, nsChangeHint_RepaintFrame);
aChange &= ~nsChangeHint_RepaintFrame;
if (!aChange) {
return;
}
}
}
DoApplyRenderingChangeToTree(aFrame, aChange);
#ifdef DEBUG
gInApplyRenderingChangeToTree = false;
#endif
}
static void AddSubtreeToOverflowTracker(
nsIFrame* aFrame, OverflowChangedTracker& aOverflowChangedTracker) {
if (aFrame->FrameMaintainsOverflow()) {
aOverflowChangedTracker.AddFrame(aFrame,
OverflowChangedTracker::CHILDREN_CHANGED);
}
for (const auto& childList : aFrame->ChildLists()) {
for (nsIFrame* child : childList.mList) {
AddSubtreeToOverflowTracker(child, aOverflowChangedTracker);
}
}
}
static void StyleChangeReflow(nsIFrame* aFrame, nsChangeHint aHint) {
IntrinsicDirty dirtyType;
if (aHint & nsChangeHint_ClearDescendantIntrinsics) {
NS_ASSERTION(aHint & nsChangeHint_ClearAncestorIntrinsics,
"Please read the comments in nsChangeHint.h");
NS_ASSERTION(aHint & nsChangeHint_NeedDirtyReflow,
"ClearDescendantIntrinsics requires NeedDirtyReflow");
dirtyType = IntrinsicDirty::StyleChange;
} else if ((aHint & nsChangeHint_UpdateComputedBSize) &&
aFrame->HasAnyStateBits(
NS_FRAME_DESCENDANT_INTRINSIC_ISIZE_DEPENDS_ON_BSIZE)) {
dirtyType = IntrinsicDirty::StyleChange;
} else if (aHint & nsChangeHint_ClearAncestorIntrinsics) {
dirtyType = IntrinsicDirty::TreeChange;
} else if ((aHint & nsChangeHint_UpdateComputedBSize) &&
HasBoxAncestor(aFrame)) {
// The frame's computed BSize is changing, and we have a box ancestor
// whose cached intrinsic height may need to be updated.
dirtyType = IntrinsicDirty::TreeChange;
} else {
dirtyType = IntrinsicDirty::Resize;
}
if (aHint & nsChangeHint_UpdateComputedBSize) {
aFrame->SetHasBSizeChange(true);
}
nsFrameState dirtyBits;
if (aFrame->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
dirtyBits = nsFrameState(0);
} else if ((aHint & nsChangeHint_NeedDirtyReflow) ||
dirtyType == IntrinsicDirty::StyleChange) {
dirtyBits = NS_FRAME_IS_DIRTY;
} else {
dirtyBits = NS_FRAME_HAS_DIRTY_CHILDREN;
}
// If we're not going to clear any intrinsic sizes on the frames, and
// there are no dirty bits to set, then there's nothing to do.
if (dirtyType == IntrinsicDirty::Resize && !dirtyBits) return;
ReflowRootHandling rootHandling;
if (aHint & nsChangeHint_ReflowChangesSizeOrPosition) {
rootHandling = ReflowRootHandling::PositionOrSizeChange;
} else {
rootHandling = ReflowRootHandling::NoPositionOrSizeChange;
}
do {
aFrame->PresShell()->FrameNeedsReflow(aFrame, dirtyType, dirtyBits,
rootHandling);
aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame);
} while (aFrame);
}
// Get the next sibling which might have a frame. This only considers siblings
// that stylo post-traversal looks at, so only elements and text. In
// particular, it ignores comments.
static nsIContent* NextSiblingWhichMayHaveFrame(nsIContent* aContent) {
for (nsIContent* next = aContent->GetNextSibling(); next;
next = next->GetNextSibling()) {
if (next->IsElement() || next->IsText()) {
return next;
}
}
return nullptr;
}
void RestyleManager::ProcessRestyledFrames(nsStyleChangeList& aChangeList) {
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"Someone forgot a script blocker");
// See bug 1378219 comment 9:
// Recursive calls here are a bit worrying, but apparently do happen in the
// wild (although not currently in any of our automated tests). Try to get a
// stack from Nightly/Dev channel to figure out what's going on and whether
// it's OK.
MOZ_DIAGNOSTIC_ASSERT(!mDestroyedFrames, "ProcessRestyledFrames recursion");
if (aChangeList.IsEmpty()) {
return;
}
// If mDestroyedFrames is null, we want to create a new hashtable here
// and destroy it on exit; but if it is already non-null (because we're in
// a recursive call), we will continue to use the existing table to
// accumulate destroyed frames, and NOT clear mDestroyedFrames on exit.
// We use a MaybeClearDestroyedFrames helper to conditionally reset the
// mDestroyedFrames pointer when this method returns.
typedef decltype(mDestroyedFrames) DestroyedFramesT;
class MOZ_RAII MaybeClearDestroyedFrames {
private:
DestroyedFramesT& mDestroyedFramesRef; // ref to caller's mDestroyedFrames
const bool mResetOnDestruction;
public:
explicit MaybeClearDestroyedFrames(DestroyedFramesT& aTarget)
: mDestroyedFramesRef(aTarget),
mResetOnDestruction(!aTarget) // reset only if target starts out null
{}
~MaybeClearDestroyedFrames() {
if (mResetOnDestruction) {
mDestroyedFramesRef.reset(nullptr);
}
}
};
MaybeClearDestroyedFrames maybeClear(mDestroyedFrames);
if (!mDestroyedFrames) {
mDestroyedFrames = MakeUnique<nsTHashtable<nsPtrHashKey<const nsIFrame>>>();
}
AUTO_PROFILER_LABEL("RestyleManager::ProcessRestyledFrames", LAYOUT);
nsPresContext* presContext = PresContext();
nsCSSFrameConstructor* frameConstructor = presContext->FrameConstructor();
// Handle nsChangeHint_ScrollbarChange, by either updating the
// scrollbars on the viewport, or upgrading the change hint to
// frame-reconstruct.
for (nsStyleChangeData& data : aChangeList) {
if (data.mHint & nsChangeHint_ScrollbarChange) {
data.mHint &= ~nsChangeHint_ScrollbarChange;
bool doReconstruct = true; // assume the worst
// Only bother with this if we're html/body, since:
// (a) It'd be *expensive* to reframe these particular nodes. They're
// at the root, so reframing would mean rebuilding the world.
// (b) It's often *unnecessary* to reframe for "overflow" changes on
// these particular nodes. In general, the only reason we reframe
// for "overflow" changes is so we can construct (or destroy) a
// scrollframe & scrollbars -- and the html/body nodes often don't
// need their own scrollframe/scrollbars because they coopt the ones
// on the viewport (which always exist). So depending on whether
// that's happening, we can skip the reframe for these nodes.
if (data.mContent->IsAnyOfHTMLElements(nsGkAtoms::body,
nsGkAtoms::html)) {
// If the restyled element provided/provides the scrollbar styles for
// the viewport before and/or after this restyle, AND it's not coopting
// that responsibility from some other element (which would need
// reconstruction to make its own scrollframe now), THEN: we don't need
// to reconstruct - we can just reflow, because no scrollframe is being
// added/removed.
nsIContent* prevOverrideNode =
presContext->GetViewportScrollStylesOverrideElement();
nsIContent* newOverrideNode =
presContext->UpdateViewportScrollStylesOverride();
if (data.mContent == prevOverrideNode ||
data.mContent == newOverrideNode) {
// If we get here, the restyled element provided the scrollbar styles
// for viewport before this restyle, OR it will provide them after.
if (!prevOverrideNode || !newOverrideNode ||
prevOverrideNode == newOverrideNode) {
// If we get here, the restyled element is NOT replacing (or being
// replaced by) some other element as the viewport's
// scrollbar-styles provider. (If it were, we'd potentially need to
// reframe to create a dedicated scrollframe for whichever element
// is being booted from providing viewport scrollbar styles.)
//
// Under these conditions, we're OK to assume that this "overflow"
// change only impacts the root viewport's scrollframe, which
// already exists, so we can simply reflow instead of reframing.
data.mHint |= nsChangeHint_ReflowHintsForScrollbarChange;
doReconstruct = false;
}
}
}
if (doReconstruct) {
data.mHint |= nsChangeHint_ReconstructFrame;
}
}
}
bool didUpdateCursor = false;
for (size_t i = 0; i < aChangeList.Length(); ++i) {
// Collect and coalesce adjacent siblings for lazy frame construction.
// Eventually it would be even better to make RecreateFramesForContent
// accept a range and coalesce all adjacent reconstructs (bug 1344139).
size_t lazyRangeStart = i;
while (i < aChangeList.Length() && aChangeList[i].mContent &&
aChangeList[i].mContent->HasFlag(NODE_NEEDS_FRAME) &&
(i == lazyRangeStart ||
NextSiblingWhichMayHaveFrame(aChangeList[i - 1].mContent) ==
aChangeList[i].mContent)) {
MOZ_ASSERT(aChangeList[i].mHint & nsChangeHint_ReconstructFrame);
MOZ_ASSERT(!aChangeList[i].mFrame);
++i;
}
if (i != lazyRangeStart) {
nsIContent* start = aChangeList[lazyRangeStart].mContent;
nsIContent* end =
NextSiblingWhichMayHaveFrame(aChangeList[i - 1].mContent);
if (!end) {
frameConstructor->ContentAppended(
start, nsCSSFrameConstructor::InsertionKind::Sync);
} else {
frameConstructor->ContentRangeInserted(
start, end, nsCSSFrameConstructor::InsertionKind::Sync);
}
}
for (size_t j = lazyRangeStart; j < i; ++j) {
MOZ_ASSERT(!aChangeList[j].mContent->GetPrimaryFrame() ||
!aChangeList[j].mContent->HasFlag(NODE_NEEDS_FRAME));
}
if (i == aChangeList.Length()) {
break;
}
const nsStyleChangeData& data = aChangeList[i];
nsIFrame* frame = data.mFrame;
nsIContent* content = data.mContent;
nsChangeHint hint = data.mHint;
bool didReflowThisFrame = false;
NS_ASSERTION(!(hint & nsChangeHint_AllReflowHints) ||
(hint & nsChangeHint_NeedReflow),
"Reflow hint bits set without actually asking for a reflow");
// skip any frame that has been destroyed due to a ripple effect
if (frame && mDestroyedFrames->Contains(frame)) {
continue;
}
if (frame && frame->GetContent() != content) {
// XXXbz this is due to image maps messing with the primary frame of
// <area>s. See bug 135040. Remove this block once that's fixed.
frame = nullptr;
if (!(hint & nsChangeHint_ReconstructFrame)) {
continue;
}
}
if ((hint & nsChangeHint_UpdateContainingBlock) && frame &&
!(hint & nsChangeHint_ReconstructFrame)) {
if (NeedToReframeToUpdateContainingBlock(frame) ||
frame->IsFieldSetFrame() ||
frame->GetContentInsertionFrame() != frame) {
// The frame has positioned children that need to be reparented, or
// it can't easily be converted to/from being an abs-pos container
// correctly.
hint |= nsChangeHint_ReconstructFrame;
} else {
for (nsIFrame* cont = frame; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
// Normally frame construction would set state bits as needed,
// but we're not going to reconstruct the frame so we need to set
// them. It's because we need to set this state on each affected frame
// that we can't coalesce nsChangeHint_UpdateContainingBlock hints up
// to ancestors (i.e. it can't be an change hint that is handled for
// descendants).
if (cont->IsAbsPosContainingBlock()) {
if (!cont->IsAbsoluteContainer() &&
cont->HasAnyStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN)) {
cont->MarkAsAbsoluteContainingBlock();
}
} else {
if (cont->IsAbsoluteContainer()) {
if (cont->HasAbsolutelyPositionedChildren()) {
// If |cont| still has absolutely positioned children,
// we can't call MarkAsNotAbsoluteContainingBlock. This
// will remove a frame list that still has children in
// it that we need to keep track of.
// The optimization of removing it isn't particularly
// important, although it does mean we skip some tests.
NS_WARNING("skipping removal of absolute containing block");
} else {
cont->MarkAsNotAbsoluteContainingBlock();
}
}
}
}
}
}
if ((hint & nsChangeHint_AddOrRemoveTransform) && frame &&
!(hint & nsChangeHint_ReconstructFrame)) {
for (nsIFrame* cont = frame; cont;
cont = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
if (cont->StyleDisplay()->HasTransform(cont)) {
cont->AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
}
// Don't remove NS_FRAME_MAY_BE_TRANSFORMED since it may still be
// transformed by other means. It's OK to have the bit even if it's
// not needed.
}
}
if (hint & nsChangeHint_ReconstructFrame) {
// If we ever start passing true here, be careful of restyles
// that involve a reframe and animations. In particular, if the
// restyle we're processing here is an animation restyle, but
// the style resolution we will do for the frame construction
// happens async when we're not in an animation restyle already,
// problems could arise.
// We could also have problems with triggering of CSS transitions
// on elements whose frames are reconstructed, since we depend on
// the reconstruction happening synchronously.
frameConstructor->RecreateFramesForContent(
content, nsCSSFrameConstructor::InsertionKind::Sync);
frame = content->GetPrimaryFrame();
} else {
NS_ASSERTION(frame, "This shouldn't happen");
if (!frame->FrameMaintainsOverflow()) {
// frame does not maintain overflow rects, so avoid calling
// FinishAndStoreOverflow on it:
hint &=
~(nsChangeHint_UpdateOverflow | nsChangeHint_ChildrenOnlyTransform |
nsChangeHint_UpdatePostTransformOverflow |
nsChangeHint_UpdateParentOverflow |
nsChangeHint_UpdateSubtreeOverflow);
}
if (!frame->HasAnyStateBits(NS_FRAME_MAY_BE_TRANSFORMED)) {
// Frame can not be transformed, and thus a change in transform will
// have no effect and we should not use either
// nsChangeHint_UpdatePostTransformOverflow or
// nsChangeHint_UpdateTransformLayerhint.
hint &= ~(nsChangeHint_UpdatePostTransformOverflow |
nsChangeHint_UpdateTransformLayer);
}
if (hint & nsChangeHint_AddOrRemoveTransform) {
// When dropping a running transform animation we will first add an
// nsChangeHint_UpdateTransformLayer hint as part of the animation-only
// restyle. During the subsequent regular restyle, if the animation was
// the only reason the element had any transform applied, we will add
// nsChangeHint_AddOrRemoveTransform as part of the regular restyle.
//
// With the Gecko backend, these two change hints are processed
// after each restyle but when using the Servo backend they accumulate
// and are processed together after we have already removed the
// transform as part of the regular restyle. Since we don't actually
// need the nsChangeHint_UpdateTransformLayer hint if we already have
// a nsChangeHint_AddOrRemoveTransform hint, and since we
// will fail an assertion in ApplyRenderingChangeToTree if we try
// specify nsChangeHint_UpdateTransformLayer but don't have any
// transform style, we just drop the unneeded hint here.
hint &= ~nsChangeHint_UpdateTransformLayer;
}
if ((hint & nsChangeHint_UpdateEffects) &&
frame == nsLayoutUtils::FirstContinuationOrIBSplitSibling(frame)) {
SVGObserverUtils::UpdateEffects(frame);
}
if ((hint & nsChangeHint_InvalidateRenderingObservers) ||
((hint & nsChangeHint_UpdateOpacityLayer) &&
frame->IsFrameOfType(nsIFrame::eSVG) &&
!frame->IsSVGOuterSVGFrame())) {
SVGObserverUtils::InvalidateRenderingObservers(frame);
frame->SchedulePaint();
}
if (hint & nsChangeHint_NeedReflow) {
StyleChangeReflow(frame, hint);
didReflowThisFrame = true;
}
// Here we need to propagate repaint frame change hint instead of update
// opacity layer change hint when we do opacity optimization for SVG.
// We can't do it in nsStyleEffects::CalcDifference() just like we do
// for the optimization for 0.99 over opacity values since we have no way
// to call SVGUtils::CanOptimizeOpacity() there.
if ((hint & nsChangeHint_UpdateOpacityLayer) &&
SVGUtils::CanOptimizeOpacity(frame)) {
hint &= ~nsChangeHint_UpdateOpacityLayer;
hint |= nsChangeHint_RepaintFrame;
}
if ((hint & nsChangeHint_UpdateUsesOpacity) &&
frame->IsFrameOfType(nsIFrame::eTablePart)) {
NS_ASSERTION(hint & nsChangeHint_UpdateOpacityLayer,
"should only return UpdateUsesOpacity hint "
"when also returning UpdateOpacityLayer hint");
// When an internal table part (including cells) changes between
// having opacity 1 and non-1, it changes whether its
// backgrounds (and those of table parts inside of it) are
// painted as part of the table's nsDisplayTableBorderBackground
// display item, or part of its own display item. That requires
// invalidation, so change UpdateOpacityLayer to RepaintFrame.
hint &= ~nsChangeHint_UpdateOpacityLayer;
hint |= nsChangeHint_RepaintFrame;
}
// Opacity disables preserve-3d, so if we toggle it, then we also need
// to update the overflow areas of all potentially affected frames.
if ((hint & nsChangeHint_UpdateUsesOpacity) &&
frame->StyleDisplay()->mTransformStyle ==
StyleTransformStyle::Preserve3d) {
hint |= nsChangeHint_UpdateSubtreeOverflow;
}
if (hint & nsChangeHint_UpdateBackgroundPosition) {
// For most frame types, DLBI can detect background position changes,
// so we only need to schedule a paint.
hint |= nsChangeHint_SchedulePaint;
if (frame->IsFrameOfType(nsIFrame::eTablePart) ||
frame->IsFrameOfType(nsIFrame::eMathML)) {
// Table parts and MathML frames don't build display items for their
// backgrounds, so DLBI can't detect background-position changes for
// these frames. Repaint the whole frame.
hint |= nsChangeHint_RepaintFrame;
}
}
if (hint &
(nsChangeHint_RepaintFrame | nsChangeHint_UpdateOpacityLayer |
nsChangeHint_UpdateTransformLayer |
nsChangeHint_ChildrenOnlyTransform | nsChangeHint_SchedulePaint)) {
ApplyRenderingChangeToTree(presContext->PresShell(), frame, hint);
}
if ((hint & nsChangeHint_RecomputePosition) && !didReflowThisFrame) {
ActiveLayerTracker::NotifyOffsetRestyle(frame);
// It is possible for this to fall back to a reflow
if (!RecomputePosition(frame)) {
StyleChangeReflow(frame,
nsChangeHint_NeedReflow |
nsChangeHint_ReflowChangesSizeOrPosition);
didReflowThisFrame = true;
}
}
NS_ASSERTION(!(hint & nsChangeHint_ChildrenOnlyTransform) ||
(hint & nsChangeHint_UpdateOverflow),
"nsChangeHint_UpdateOverflow should be passed too");
if (!didReflowThisFrame &&
(hint & (nsChangeHint_UpdateOverflow |
nsChangeHint_UpdatePostTransformOverflow |
nsChangeHint_UpdateParentOverflow |
nsChangeHint_UpdateSubtreeOverflow))) {
if (hint & nsChangeHint_UpdateSubtreeOverflow) {
for (nsIFrame* cont = frame; cont;
cont =
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
AddSubtreeToOverflowTracker(cont, mOverflowChangedTracker);
}
// The work we just did in AddSubtreeToOverflowTracker
// subsumes some of the other hints:
hint &= ~(nsChangeHint_UpdateOverflow |
nsChangeHint_UpdatePostTransformOverflow);
}
if (hint & nsChangeHint_ChildrenOnlyTransform) {
// We need to update overflows. The correct frame(s) to update depends
// on whether the ChangeHint came from an outer or an inner svg.
nsIFrame* hintFrame = GetFrameForChildrenOnlyTransformHint(frame);
NS_ASSERTION(
!nsLayoutUtils::GetNextContinuationOrIBSplitSibling(frame),
"SVG frames should not have continuations "
"or ib-split siblings");
NS_ASSERTION(
!nsLayoutUtils::GetNextContinuationOrIBSplitSibling(hintFrame),
"SVG frames should not have continuations "
"or ib-split siblings");
if (hintFrame->IsSVGOuterSVGAnonChildFrame()) {
// The children only transform of an outer svg frame is applied to
// the outer svg's anonymous child frame (instead of to the
// anonymous child's children).
// If |hintFrame| is dirty or has dirty children, we don't bother
// updating overflows since that will happen when it's reflowed.
if (!hintFrame->HasAnyStateBits(NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN)) {
mOverflowChangedTracker.AddFrame(
hintFrame, OverflowChangedTracker::CHILDREN_CHANGED);
}
} else {
// The children only transform is applied to the child frames of an
// inner svg frame, so update the child overflows.
nsIFrame* childFrame = hintFrame->PrincipalChildList().FirstChild();
for (; childFrame; childFrame = childFrame->GetNextSibling()) {
MOZ_ASSERT(childFrame->IsFrameOfType(nsIFrame::eSVG),
"Not expecting non-SVG children");
// If |childFrame| is dirty or has dirty children, we don't bother
// updating overflows since that will happen when it's reflowed.
if (!childFrame->HasAnyStateBits(NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN)) {
mOverflowChangedTracker.AddFrame(
childFrame, OverflowChangedTracker::CHILDREN_CHANGED);
}
NS_ASSERTION(!nsLayoutUtils::GetNextContinuationOrIBSplitSibling(
childFrame),
"SVG frames should not have continuations "
"or ib-split siblings");
NS_ASSERTION(
childFrame->GetParent() == hintFrame,
"SVG child frame not expected to have different parent");
}
}
}
// If |frame| is dirty or has dirty children, we don't bother updating
// overflows since that will happen when it's reflowed.
if (!frame->HasAnyStateBits(NS_FRAME_IS_DIRTY |
NS_FRAME_HAS_DIRTY_CHILDREN)) {
if (hint & (nsChangeHint_UpdateOverflow |
nsChangeHint_UpdatePostTransformOverflow)) {
OverflowChangedTracker::ChangeKind changeKind;
// If we have both nsChangeHint_UpdateOverflow and
// nsChangeHint_UpdatePostTransformOverflow,
// CHILDREN_CHANGED is selected as it is
// strictly stronger.
if (hint & nsChangeHint_UpdateOverflow) {
changeKind = OverflowChangedTracker::CHILDREN_CHANGED;
} else {
changeKind = OverflowChangedTracker::TRANSFORM_CHANGED;
}
for (nsIFrame* cont = frame; cont;
cont =
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
mOverflowChangedTracker.AddFrame(cont, changeKind);
}
}
// UpdateParentOverflow hints need to be processed in addition
// to the above, since if the processing of the above hints
// yields no change, the update will not propagate to the
// parent.
if (hint & nsChangeHint_UpdateParentOverflow) {
MOZ_ASSERT(frame->GetParent(),
"shouldn't get style hints for the root frame");
for (nsIFrame* cont = frame; cont;
cont =
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(cont)) {
mOverflowChangedTracker.AddFrame(
cont->GetParent(), OverflowChangedTracker::CHILDREN_CHANGED);
}
}
}
}
if ((hint & nsChangeHint_UpdateCursor) && !didUpdateCursor) {
presContext->PresShell()->SynthesizeMouseMove(false);
didUpdateCursor = true;
}
if (hint & nsChangeHint_UpdateTableCellSpans) {
frameConstructor->UpdateTableCellSpans(content);
}
if (hint & nsChangeHint_VisibilityChange) {
frame->UpdateVisibleDescendantsState();
}
}
}
aChangeList.Clear();
FlushOverflowChangedTracker();
}
/* static */
uint64_t RestyleManager::GetAnimationGenerationForFrame(nsIFrame* aStyleFrame) {
EffectSet* effectSet = EffectSet::GetEffectSetForStyleFrame(aStyleFrame);
return effectSet ? effectSet->GetAnimationGeneration() : 0;
}
void RestyleManager::IncrementAnimationGeneration() {
// We update the animation generation at start of each call to
// ProcessPendingRestyles so we should ignore any subsequent (redundant)
// calls that occur while we are still processing restyles.
if (!mInStyleRefresh) {
++mAnimationGeneration;
}
}
/* static */
void RestyleManager::AddLayerChangesForAnimation(
nsIFrame* aStyleFrame, nsIFrame* aPrimaryFrame, Element* aElement,
nsChangeHint aHintForThisFrame, nsStyleChangeList& aChangeListToProcess) {
MOZ_ASSERT(aElement);
MOZ_ASSERT(!!aStyleFrame == !!aPrimaryFrame);
if (!aStyleFrame) {
return;
}
uint64_t frameGeneration =
RestyleManager::GetAnimationGenerationForFrame(aStyleFrame);
Maybe<nsCSSPropertyIDSet> effectiveAnimationProperties;
nsChangeHint hint = nsChangeHint(0);
auto maybeApplyChangeHint = [&](const Maybe<uint64_t>& aGeneration,
DisplayItemType aDisplayItemType) -> bool {
if (aGeneration && frameGeneration != *aGeneration) {
// If we have a transform layer but don't have any transform style, we
// probably just removed the transform but haven't destroyed the layer
// yet. In this case we will typically add the appropriate change hint
// (nsChangeHint_UpdateContainingBlock) when we compare styles so in
// theory we could skip adding any change hint here.
//
// However, sometimes when we compare styles we'll get no change. For
// example, if the transform style was 'none' when we sent the transform
// animation to the compositor and the current transform style is now
// 'none' we'll think nothing changed but actually we still need to
// trigger an update to clear whatever style the transform animation set
// on the compositor. To handle this case we simply set all the change
// hints relevant to removing transform style (since we don't know exactly
// what changes happened while the animation was running on the
// compositor).
//
// Note that we *don't* add nsChangeHint_UpdateTransformLayer since if we
// did, ApplyRenderingChangeToTree would complain that we're updating a
// transform layer without a transform.
if (aDisplayItemType == DisplayItemType::TYPE_TRANSFORM &&
!aStyleFrame->StyleDisplay()->HasTransformStyle()) {
// Add all the hints for a removing a transform if they are not already
// set for this frame.
if (!(NS_IsHintSubset(nsChangeHint_ComprehensiveAddOrRemoveTransform,
aHintForThisFrame))) {
hint |= nsChangeHint_ComprehensiveAddOrRemoveTransform;
}
return true;
}
hint |= LayerAnimationInfo::GetChangeHintFor(aDisplayItemType);
}
// We consider it's the first paint for the frame if we have an animation
// for the property but have no layer, for the case of WebRender, no
// corresponding animation info.
// Note that in case of animations which has properties preventing running
// on the compositor, e.g., width or height, corresponding layer is not
// created at all, but even in such cases, we normally set valid change
// hint for such animations in each tick, i.e. restyles in each tick. As
// a result, we usually do restyles for such animations in every tick on
// the main-thread. The only animations which will be affected by this
// explicit change hint are animations that have opacity/transform but did
// not have those properies just before. e.g, setting transform by
// setKeyframes or changing target element from other target which prevents
// running on the compositor, etc.
if (!aGeneration) {
nsChangeHint hintForDisplayItem =
LayerAnimationInfo::GetChangeHintFor(aDisplayItemType);
// We don't need to apply the corresponding change hint if we already have
// it.
if (NS_IsHintSubset(hintForDisplayItem, aHintForThisFrame)) {
return true;
}
if (!effectiveAnimationProperties) {
effectiveAnimationProperties.emplace(
nsLayoutUtils::GetAnimationPropertiesForCompositor(aStyleFrame));
}
const nsCSSPropertyIDSet& propertiesForDisplayItem =
LayerAnimationInfo::GetCSSPropertiesFor(aDisplayItemType);
if (effectiveAnimationProperties->Intersects(propertiesForDisplayItem)) {
hint |= hintForDisplayItem;
}
}
return true;
};
AnimationInfo::EnumerateGenerationOnFrame(
aStyleFrame, aElement, LayerAnimationInfo::sDisplayItemTypes,
maybeApplyChangeHint);
if (hint) {
// We apply the hint to the primary frame, not the style frame. Transform
// and opacity hints apply to the table wrapper box, not the table box.
aChangeListToProcess.AppendChange(aPrimaryFrame, aElement, hint);
}
}
RestyleManager::AnimationsWithDestroyedFrame::AnimationsWithDestroyedFrame(
RestyleManager* aRestyleManager)
: mRestyleManager(aRestyleManager),
mRestorePointer(mRestyleManager->mAnimationsWithDestroyedFrame) {
MOZ_ASSERT(!mRestyleManager->mAnimationsWithDestroyedFrame,
"shouldn't construct recursively");
mRestyleManager->mAnimationsWithDestroyedFrame = this;
}
void RestyleManager::AnimationsWithDestroyedFrame ::
StopAnimationsForElementsWithoutFrames() {
StopAnimationsWithoutFrame(mContents, PseudoStyleType::NotPseudo);
StopAnimationsWithoutFrame(mBeforeContents, PseudoStyleType::before);
StopAnimationsWithoutFrame(mAfterContents, PseudoStyleType::after);
StopAnimationsWithoutFrame(mMarkerContents, PseudoStyleType::marker);
}
void RestyleManager::AnimationsWithDestroyedFrame ::StopAnimationsWithoutFrame(
nsTArray<RefPtr<nsIContent>>& aArray, PseudoStyleType aPseudoType) {
nsAnimationManager* animationManager =
mRestyleManager->PresContext()->AnimationManager();
nsTransitionManager* transitionManager =
mRestyleManager->PresContext()->TransitionManager();
for (nsIContent* content : aArray) {
if (aPseudoType == PseudoStyleType::NotPseudo) {
if (content->GetPrimaryFrame()) {
continue;
}
} else if (aPseudoType == PseudoStyleType::before) {
if (nsLayoutUtils::GetBeforeFrame(content)) {
continue;
}
} else if (aPseudoType == PseudoStyleType::after) {
if (nsLayoutUtils::GetAfterFrame(content)) {
continue;
}
} else if (aPseudoType == PseudoStyleType::marker) {
if (nsLayoutUtils::GetMarkerFrame(content)) {
continue;
}
}
dom::Element* element = content->AsElement();
animationManager->StopAnimationsForElement(element, aPseudoType);
transitionManager->StopAnimationsForElement(element, aPseudoType);
// All other animations should keep running but not running on the
// *compositor* at this point.
EffectSet* effectSet = EffectSet::GetEffectSet(element, aPseudoType);
if (effectSet) {
for (KeyframeEffect* effect : *effectSet) {
effect->ResetIsRunningOnCompositor();
}
}
}
}
#ifdef DEBUG
static bool IsAnonBox(const nsIFrame* aFrame) {
return aFrame->Style()->IsAnonBox();
}
static const nsIFrame* FirstContinuationOrPartOfIBSplit(
const nsIFrame* aFrame) {
if (!aFrame) {
return nullptr;
}
return nsLayoutUtils::FirstContinuationOrIBSplitSibling(aFrame);
}
static const nsIFrame* ExpectedOwnerForChild(const nsIFrame* aFrame) {
const nsIFrame* parent = aFrame->GetParent();
if (aFrame->IsTableFrame()) {
MOZ_ASSERT(parent->IsTableWrapperFrame());
parent = parent->GetParent();
}
if (IsAnonBox(aFrame) && !aFrame->IsTextFrame()) {
if (parent->IsLineFrame()) {
parent = parent->GetParent();
}
return parent->IsViewportFrame() ? nullptr
: FirstContinuationOrPartOfIBSplit(parent);
}
if (aFrame->IsLineFrame()) {
// A ::first-line always ends up here via its block, which is therefore the
// right expected owner. That block can be an
// anonymous box. For example, we could have a ::first-line on a columnated
// block; the blockframe is the column-content anonymous box in that case.
// So we don't want to end up in the code below, which steps out of anon
// boxes. Just return the parent of the line frame, which is the block.
return parent;
}
if (aFrame->IsLetterFrame()) {
// Ditto for ::first-letter. A first-letter always arrives here via its
// direct parent, except when it's parented to a ::first-line.
if (parent->IsLineFrame()) {
parent = parent->GetParent();
}
return FirstContinuationOrPartOfIBSplit(parent);
}