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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/. */
/* rendering object for replaced elements with image data */
#include "nsImageFrame.h"
#include "TextDrawTarget.h"
#include "gfx2DGlue.h"
#include "gfxContext.h"
#include "gfxUtils.h"
#include "mozilla/ComputedStyle.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/Encoding.h"
#include "mozilla/EventStates.h"
#include "mozilla/HTMLEditor.h"
#include "mozilla/dom/ImageTracker.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Helpers.h"
#include "mozilla/gfx/PathHelpers.h"
#include "mozilla/dom/GeneratedImageContent.h"
#include "mozilla/dom/HTMLAreaElement.h"
#include "mozilla/dom/HTMLImageElement.h"
#include "mozilla/dom/ResponsiveImageSelector.h"
#include "mozilla/layers/RenderRootStateManager.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/PresShell.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/StaticPrefs_image.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/SVGImageContext.h"
#include "mozilla/Unused.h"
#include "nsCOMPtr.h"
#include "nsFontMetrics.h"
#include "nsIImageLoadingContent.h"
#include "nsImageLoadingContent.h"
#include "nsImageRenderer.h"
#include "nsString.h"
#include "nsPrintfCString.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "mozilla/dom/Document.h"
#include "nsContentUtils.h"
#include "nsCSSAnonBoxes.h"
#include "nsStyleConsts.h"
#include "nsStyleUtil.h"
#include "nsTransform2D.h"
#include "nsImageMap.h"
#include "nsILoadGroup.h"
#include "nsNetUtil.h"
#include "nsNetCID.h"
#include "nsCSSRendering.h"
#include "nsNameSpaceManager.h"
#include <algorithm>
#ifdef ACCESSIBILITY
# include "nsAccessibilityService.h"
#endif
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "nsIContent.h"
#include "FrameLayerBuilder.h"
#include "mozilla/dom/Selection.h"
#include "nsIURIMutator.h"
#include "imgIContainer.h"
#include "imgLoader.h"
#include "imgRequestProxy.h"
#include "nsCSSFrameConstructor.h"
#include "nsRange.h"
#include "nsError.h"
#include "nsBidiUtils.h"
#include "nsBidiPresUtils.h"
#include "gfxRect.h"
#include "ImageLayers.h"
#include "ImageRegion.h"
#include "ImageContainer.h"
#include "mozilla/ServoStyleSet.h"
#include "nsBlockFrame.h"
#include "nsStyleStructInlines.h"
#include "mozilla/Preferences.h"
#include "mozilla/dom/Link.h"
#include "mozilla/dom/HTMLAnchorElement.h"
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::image;
using namespace mozilla::layers;
using mozilla::layout::TextDrawTarget;
class nsDisplayGradient final : public nsPaintedDisplayItem {
public:
nsDisplayGradient(nsDisplayListBuilder* aBuilder, nsImageFrame* aFrame)
: nsPaintedDisplayItem(aBuilder, aFrame) {
MOZ_COUNT_CTOR(nsDisplayGradient);
}
~nsDisplayGradient() final { MOZ_COUNT_DTOR(nsDisplayGradient); }
nsDisplayItemGeometry* AllocateGeometry(
nsDisplayListBuilder* aBuilder) final {
return new nsDisplayItemGenericImageGeometry(this, aBuilder);
}
nsRect GetBounds(bool* aSnap) const {
*aSnap = true;
auto* imageFrame = static_cast<nsImageFrame*>(mFrame);
return imageFrame->GetInnerArea() + ToReferenceFrame();
}
nsRect GetBounds(nsDisplayListBuilder*, bool* aSnap) const final {
return GetBounds(aSnap);
}
void Paint(nsDisplayListBuilder*, gfxContext* aCtx) final;
bool CreateWebRenderCommands(mozilla::wr::DisplayListBuilder&,
mozilla::wr::IpcResourceUpdateQueue&,
const StackingContextHelper&,
mozilla::layers::RenderRootStateManager*,
nsDisplayListBuilder*) final;
NS_DISPLAY_DECL_NAME("Gradient", TYPE_GRADIENT)
};
void nsDisplayGradient::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) {
auto* frame = static_cast<nsImageFrame*>(Frame());
nsImageRenderer imageRenderer(frame, frame->GetImageFromStyle(),
aBuilder->GetImageRendererFlags());
nsSize size = frame->GetSize();
imageRenderer.SetPreferredSize({}, size);
ImgDrawResult result;
if (!imageRenderer.PrepareImage()) {
result = imageRenderer.PrepareResult();
} else {
nsRect dest(ToReferenceFrame(), size);
result = imageRenderer.DrawLayer(frame->PresContext(), *aCtx, dest, dest,
dest.TopLeft(), GetPaintRect(),
dest.Size(), /* aOpacity = */ 1.0f);
}
nsDisplayItemGenericImageGeometry::UpdateDrawResult(this, result);
}
bool nsDisplayGradient::CreateWebRenderCommands(
wr::DisplayListBuilder& aBuilder, wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc,
mozilla::layers::RenderRootStateManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) {
auto* frame = static_cast<nsImageFrame*>(Frame());
nsImageRenderer imageRenderer(frame, frame->GetImageFromStyle(),
aDisplayListBuilder->GetImageRendererFlags());
nsSize size = frame->GetSize();
imageRenderer.SetPreferredSize({}, size);
ImgDrawResult result;
if (!imageRenderer.PrepareImage()) {
result = imageRenderer.PrepareResult();
} else {
nsRect dest(ToReferenceFrame(), size);
result = imageRenderer.BuildWebRenderDisplayItemsForLayer(
frame->PresContext(), aBuilder, aResources, aSc, aManager, this, dest,
dest, dest.TopLeft(), dest, dest.Size(),
/* aOpacity = */ 1.0f);
if (result == ImgDrawResult::NOT_SUPPORTED) {
return false;
}
}
nsDisplayItemGenericImageGeometry::UpdateDrawResult(this, result);
return true;
}
// sizes (pixels) for image icon, padding and border frame
#define ICON_SIZE (16)
#define ICON_PADDING (3)
#define ALT_BORDER_WIDTH (1)
// Default alignment value (so we can tell an unset value from a set value)
#define ALIGN_UNSET uint8_t(-1)
// static icon information
StaticRefPtr<nsImageFrame::IconLoad> nsImageFrame::gIconLoad;
// test if the width and height are fixed, looking at the style data
// This is used by nsImageFrame::ShouldCreateImageFrameFor and should
// not be used for layout decisions.
static bool HaveSpecifiedSize(const nsStylePosition* aStylePosition) {
// check the width and height values in the reflow input's style struct
// - if width and height are specified as either coord or percentage, then
// the size of the image frame is constrained
return aStylePosition->mWidth.IsLengthPercentage() &&
aStylePosition->mHeight.IsLengthPercentage();
}
template <typename SizeOrMaxSize>
static bool DependsOnIntrinsicSize(const SizeOrMaxSize& aMinOrMaxSize) {
auto length = nsIFrame::ToExtremumLength(aMinOrMaxSize);
if (!length) {
return false;
}
switch (*length) {
case nsIFrame::ExtremumLength::MinContent:
case nsIFrame::ExtremumLength::MaxContent:
case nsIFrame::ExtremumLength::MozFitContent:
case nsIFrame::ExtremumLength::FitContentFunction:
return true;
case nsIFrame::ExtremumLength::MozAvailable:
return false;
}
MOZ_ASSERT_UNREACHABLE("Unknown sizing keyword?");
return false;
}
// Decide whether we can optimize away reflows that result from the
// image's intrinsic size changing.
static bool SizeDependsOnIntrinsicSize(const ReflowInput& aReflowInput) {
const auto& position = *aReflowInput.mStylePosition;
WritingMode wm = aReflowInput.GetWritingMode();
// Don't try to make this optimization when an image has percentages
// in its 'width' or 'height'. The percentages might be treated like
// auto (especially for intrinsic width calculations and for heights).
//
// min-width: min-content and such can also affect our intrinsic size.
// but note that those keywords on the block axis behave like auto, so we
// don't need to check them.
//
// Flex item's min-[width|height]:auto resolution depends on intrinsic size.
return !position.mHeight.ConvertsToLength() ||
!position.mWidth.ConvertsToLength() ||
DependsOnIntrinsicSize(position.MinISize(wm)) ||
DependsOnIntrinsicSize(position.MaxISize(wm)) ||
aReflowInput.mFrame->IsFlexItem();
}
nsIFrame* NS_NewImageFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
return new (aPresShell) nsImageFrame(aStyle, aPresShell->GetPresContext(),
nsImageFrame::Kind::ImageElement);
}
nsIFrame* NS_NewImageFrameForContentProperty(PresShell* aPresShell,
ComputedStyle* aStyle) {
return new (aPresShell) nsImageFrame(aStyle, aPresShell->GetPresContext(),
nsImageFrame::Kind::ContentProperty);
}
nsIFrame* NS_NewImageFrameForGeneratedContentIndex(PresShell* aPresShell,
ComputedStyle* aStyle) {
return new (aPresShell)
nsImageFrame(aStyle, aPresShell->GetPresContext(),
nsImageFrame::Kind::ContentPropertyAtIndex);
}
nsIFrame* NS_NewImageFrameForListStyleImage(PresShell* aPresShell,
ComputedStyle* aStyle) {
return new (aPresShell) nsImageFrame(aStyle, aPresShell->GetPresContext(),
nsImageFrame::Kind::ListStyleImage);
}
bool nsImageFrame::ShouldShowBrokenImageIcon() const {
// Blink behave differently here for content: url(..), for now adapt to
// Blink's behavior.
if (mKind != Kind::ImageElement) {
return false;
}
// <img alt=""> is special, and it shouldn't draw the broken image icon,
// unlike the no-alt attribute or non-empty-alt-attribute case.
if (auto* image = HTMLImageElement::FromNode(mContent)) {
const nsAttrValue* alt = image->GetParsedAttr(nsGkAtoms::alt);
if (alt && alt->IsEmptyString()) {
return false;
}
}
// check for broken images. valid null images (eg. img src="") are
// not considered broken because they have no image requests
if (nsCOMPtr<imgIRequest> currentRequest = GetCurrentRequest()) {
uint32_t imageStatus;
return NS_SUCCEEDED(currentRequest->GetImageStatus(&imageStatus)) &&
(imageStatus & imgIRequest::STATUS_ERROR);
}
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
MOZ_ASSERT(imageLoader);
// Show the broken image icon only if we've tried to perform a load at all
// (that is, if we have a current uri).
nsCOMPtr<nsIURI> currentURI = imageLoader->GetCurrentURI();
return !!currentURI;
}
nsImageFrame* nsImageFrame::CreateContinuingFrame(
mozilla::PresShell* aPresShell, ComputedStyle* aStyle) const {
return new (aPresShell)
nsImageFrame(aStyle, aPresShell->GetPresContext(), mKind);
}
NS_IMPL_FRAMEARENA_HELPERS(nsImageFrame)
nsImageFrame::nsImageFrame(ComputedStyle* aStyle, nsPresContext* aPresContext,
ClassID aID, Kind aKind)
: nsAtomicContainerFrame(aStyle, aPresContext, aID),
mComputedSize(0, 0),
mIntrinsicSize(0, 0),
mKind(aKind),
mContentURLRequestRegistered(false),
mDisplayingIcon(false),
mFirstFrameComplete(false),
mReflowCallbackPosted(false),
mForceSyncDecoding(false) {
EnableVisibilityTracking();
}
nsImageFrame::~nsImageFrame() = default;
NS_QUERYFRAME_HEAD(nsImageFrame)
NS_QUERYFRAME_ENTRY(nsImageFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsAtomicContainerFrame)
#ifdef ACCESSIBILITY
a11y::AccType nsImageFrame::AccessibleType() {
if (mKind == Kind::ListStyleImage) {
// This is an HTMLListBulletAccessible.
return a11y::eNoType;
}
// Don't use GetImageMap() to avoid reentrancy into accessibility.
if (HasImageMap()) {
return a11y::eHTMLImageMapType;
}
return a11y::eImageType;
}
#endif
void nsImageFrame::DisconnectMap() {
if (!mImageMap) {
return;
}
mImageMap->Destroy();
mImageMap = nullptr;
#ifdef ACCESSIBILITY
if (nsAccessibilityService* accService = GetAccService()) {
accService->RecreateAccessible(PresShell(), mContent);
}
#endif
}
void nsImageFrame::DestroyFrom(nsIFrame* aDestructRoot,
PostDestroyData& aPostDestroyData) {
if (mReflowCallbackPosted) {
PresShell()->CancelReflowCallback(this);
mReflowCallbackPosted = false;
}
// Tell our image map, if there is one, to clean up
// This causes the nsImageMap to unregister itself as
// a DOM listener.
DisconnectMap();
MOZ_ASSERT(mListener);
if (mKind == Kind::ImageElement) {
MOZ_ASSERT(!mContentURLRequest);
MOZ_ASSERT(!mContentURLRequestRegistered);
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
MOZ_ASSERT(imageLoader);
// Notify our image loading content that we are going away so it can
// deregister with our refresh driver.
imageLoader->FrameDestroyed(this);
imageLoader->RemoveNativeObserver(mListener);
} else if (mContentURLRequest) {
PresContext()->Document()->ImageTracker()->Remove(mContentURLRequest);
nsLayoutUtils::DeregisterImageRequest(PresContext(), mContentURLRequest,
&mContentURLRequestRegistered);
mContentURLRequest->Cancel(NS_BINDING_ABORTED);
}
// set the frame to null so we don't send messages to a dead object.
mListener->SetFrame(nullptr);
mListener = nullptr;
// If we were displaying an icon, take ourselves off the list
if (mDisplayingIcon) gIconLoad->RemoveIconObserver(this);
nsAtomicContainerFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
}
void nsImageFrame::MaybeRecordContentUrlOnImageTelemetry() {
if (mKind != Kind::ImageElement) {
return;
}
const auto& content = *StyleContent();
if (content.ContentCount() != 1) {
return;
}
const auto& item = content.ContentAt(0);
if (!item.IsImage()) {
return;
}
PresContext()->Document()->SetUseCounter(
eUseCounter_custom_ContentUrlOnImageContent);
}
void nsImageFrame::DidSetComputedStyle(ComputedStyle* aOldStyle) {
nsAtomicContainerFrame::DidSetComputedStyle(aOldStyle);
MaybeRecordContentUrlOnImageTelemetry();
// A ::marker's default size is calculated from the font's em-size.
if (IsForMarkerPseudo()) {
mIntrinsicSize = IntrinsicSize(0, 0);
UpdateIntrinsicSize();
}
auto newOrientation = StyleVisibility()->mImageOrientation;
// We need to update our orientation either if we had no ComputedStyle before
// because this is the first time it's been set, or if the image-orientation
// property changed from its previous value.
bool shouldUpdateOrientation =
mImage &&
(!aOldStyle ||
aOldStyle->StyleVisibility()->mImageOrientation != newOrientation);
if (shouldUpdateOrientation) {
nsCOMPtr<imgIContainer> image(mImage->Unwrap());
mImage = nsLayoutUtils::OrientImage(image, newOrientation);
UpdateIntrinsicSize();
UpdateIntrinsicRatio();
} else if (!aOldStyle || aOldStyle->StylePosition()->mAspectRatio !=
StylePosition()->mAspectRatio) {
UpdateIntrinsicRatio();
}
}
static bool SizeIsAvailable(imgIRequest* aRequest) {
if (!aRequest) {
return false;
}
uint32_t imageStatus = 0;
nsresult rv = aRequest->GetImageStatus(&imageStatus);
return NS_SUCCEEDED(rv) && (imageStatus & imgIRequest::STATUS_SIZE_AVAILABLE);
}
const StyleImage* nsImageFrame::GetImageFromStyle() const {
if (mKind == Kind::ImageElement) {
MOZ_ASSERT_UNREACHABLE("Don't call me");
return nullptr;
}
if (mKind == Kind::ListStyleImage) {
MOZ_ASSERT(
GetParent()->GetContent()->IsGeneratedContentContainerForMarker());
MOZ_ASSERT(mContent->IsHTMLElement(nsGkAtoms::mozgeneratedcontentimage));
return &StyleList()->mListStyleImage;
}
uint32_t contentIndex = 0;
const nsStyleContent* styleContent = StyleContent();
if (mKind == Kind::ContentPropertyAtIndex) {
MOZ_RELEASE_ASSERT(
mContent->IsHTMLElement(nsGkAtoms::mozgeneratedcontentimage));
contentIndex = static_cast<GeneratedImageContent*>(mContent.get())->Index();
// TODO(emilio): Consider inheriting the `content` property instead of doing
// this parent traversal?
nsIFrame* parent = GetParent();
MOZ_DIAGNOSTIC_ASSERT(
parent->GetContent()->IsGeneratedContentContainerForMarker() ||
parent->GetContent()->IsGeneratedContentContainerForAfter() ||
parent->GetContent()->IsGeneratedContentContainerForBefore());
nsIFrame* nonAnonymousParent = parent;
while (nonAnonymousParent->Style()->IsAnonBox()) {
nonAnonymousParent = nonAnonymousParent->GetParent();
}
MOZ_DIAGNOSTIC_ASSERT(parent->GetContent() ==
nonAnonymousParent->GetContent());
styleContent = nonAnonymousParent->StyleContent();
}
MOZ_RELEASE_ASSERT(contentIndex < styleContent->ContentCount());
auto& contentItem = styleContent->ContentAt(contentIndex);
MOZ_RELEASE_ASSERT(contentItem.IsImage());
return &contentItem.AsImage();
}
void nsImageFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
MOZ_ASSERT_IF(aPrevInFlow,
aPrevInFlow->Type() == Type() &&
static_cast<nsImageFrame*>(aPrevInFlow)->mKind == mKind);
nsAtomicContainerFrame::Init(aContent, aParent, aPrevInFlow);
mListener = new nsImageListener(this);
if (!gIconLoad) {
LoadIcons(PresContext());
}
if (mKind == Kind::ImageElement) {
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(aContent);
MOZ_ASSERT(imageLoader);
imageLoader->AddNativeObserver(mListener);
// We have a PresContext now, so we need to notify the image content node
// that it can register images.
imageLoader->FrameCreated(this);
} else {
const StyleImage* image = GetImageFromStyle();
MOZ_ASSERT(mKind == Kind::ListStyleImage || image->IsImageRequestType(),
"Content image should only parse url() type");
if (image->IsImageRequestType()) {
if (imgRequestProxy* proxy = image->GetImageRequest()) {
proxy->Clone(mListener, PresContext()->Document(),
getter_AddRefs(mContentURLRequest));
SetupForContentURLRequest();
}
}
}
// Give image loads associated with an image frame a small priority boost.
if (nsCOMPtr<imgIRequest> currentRequest = GetCurrentRequest()) {
uint32_t categoryToBoostPriority = imgIRequest::CATEGORY_FRAME_INIT;
// Increase load priority further if intrinsic size might be important for
// layout.
if (!HaveSpecifiedSize(StylePosition())) {
categoryToBoostPriority |= imgIRequest::CATEGORY_SIZE_QUERY;
}
currentRequest->BoostPriority(categoryToBoostPriority);
}
}
void nsImageFrame::SetupForContentURLRequest() {
MOZ_ASSERT(mKind != Kind::ImageElement);
if (!mContentURLRequest) {
return;
}
// We're not using AssociateRequestToFrame for the content property, so we
// need to add it to the image tracker manually.
PresContext()->Document()->ImageTracker()->Add(mContentURLRequest);
uint32_t status = 0;
nsresult rv = mContentURLRequest->GetImageStatus(&status);
if (NS_FAILED(rv)) {
return;
}
if (status & imgIRequest::STATUS_SIZE_AVAILABLE) {
nsCOMPtr<imgIContainer> image;
mContentURLRequest->GetImage(getter_AddRefs(image));
OnSizeAvailable(mContentURLRequest, image);
}
if (status & imgIRequest::STATUS_FRAME_COMPLETE) {
mFirstFrameComplete = true;
}
if (status & imgIRequest::STATUS_IS_ANIMATED) {
nsLayoutUtils::RegisterImageRequest(PresContext(), mContentURLRequest,
&mContentURLRequestRegistered);
}
}
static void ScaleIntrinsicSizeForDensity(IntrinsicSize& aSize,
const ImageResolution& aResolution) {
if (aSize.width) {
aResolution.ApplyXTo(aSize.width.ref());
}
if (aSize.height) {
aResolution.ApplyYTo(aSize.height.ref());
}
}
static void ScaleIntrinsicSizeForDensity(imgIContainer* aImage,
nsIContent& aContent,
IntrinsicSize& aSize) {
ImageResolution resolution = aImage->GetResolution();
if (auto* image = HTMLImageElement::FromNode(aContent)) {
if (auto* selector = image->GetResponsiveImageSelector()) {
resolution.ScaleBy(selector->GetSelectedImageDensity());
}
}
ScaleIntrinsicSizeForDensity(aSize, resolution);
}
static nscoord ListImageDefaultLength(const nsImageFrame& aFrame) {
// The spec says we should use 1em x 1em, but that seems too large.
auto* pc = aFrame.PresContext();
RefPtr<nsFontMetrics> fm =
nsLayoutUtils::GetFontMetricsForComputedStyle(aFrame.Style(), pc);
auto emAU = fm->GetThebesFontGroup()
->GetFirstValidFont()
->GetMetrics(fm->Orientation())
.emHeight *
pc->AppUnitsPerDevPixel();
return std::max(NSToCoordRound(0.4f * emAU),
nsPresContext::CSSPixelsToAppUnits(1));
}
static IntrinsicSize ComputeIntrinsicSize(imgIContainer* aImage,
bool aUseMappedRatio,
nsImageFrame::Kind aKind,
const nsImageFrame& aFrame) {
const ComputedStyle& style = *aFrame.Style();
if (style.StyleDisplay()->IsContainSize()) {
return IntrinsicSize(0, 0);
}
nsSize size;
if (aImage && NS_SUCCEEDED(aImage->GetIntrinsicSize(&size))) {
IntrinsicSize intrinsicSize;
intrinsicSize.width = size.width == -1 ? Nothing() : Some(size.width);
intrinsicSize.height = size.height == -1 ? Nothing() : Some(size.height);
if (aKind == nsImageFrame::Kind::ListStyleImage) {
if (intrinsicSize.width.isNothing() || intrinsicSize.height.isNothing()) {
nscoord defaultLength = ListImageDefaultLength(aFrame);
if (intrinsicSize.width.isNothing()) {
intrinsicSize.width = Some(defaultLength);
}
if (intrinsicSize.height.isNothing()) {
intrinsicSize.height = Some(defaultLength);
}
}
}
if (aKind == nsImageFrame::Kind::ImageElement) {
ScaleIntrinsicSizeForDensity(aImage, *aFrame.GetContent(), intrinsicSize);
} else {
ScaleIntrinsicSizeForDensity(intrinsicSize,
aFrame.GetImageFromStyle()->GetResolution());
}
return intrinsicSize;
}
if (aKind == nsImageFrame::Kind::ListStyleImage) {
// Note: images are handled above, this handles gradients etc.
nscoord defaultLength = ListImageDefaultLength(aFrame);
return IntrinsicSize(defaultLength, defaultLength);
}
if (aFrame.ShouldShowBrokenImageIcon()) {
nscoord edgeLengthToUse = nsPresContext::CSSPixelsToAppUnits(
ICON_SIZE + (2 * (ICON_PADDING + ALT_BORDER_WIDTH)));
return IntrinsicSize(edgeLengthToUse, edgeLengthToUse);
}
if (aUseMappedRatio && style.StylePosition()->mAspectRatio.HasRatio()) {
return IntrinsicSize();
}
return IntrinsicSize(0, 0);
}
// For compat reasons, see bug 1602047, we don't use the intrinsic ratio from
// width="" and height="" for images with no src attribute (no request).
//
// But we shouldn't get fooled by <img loading=lazy>. We do want to apply the
// ratio then...
bool nsImageFrame::ShouldUseMappedAspectRatio() const {
if (mKind != Kind::ImageElement) {
return true;
}
nsCOMPtr<imgIRequest> currentRequest = GetCurrentRequest();
if (currentRequest) {
return true;
}
// TODO(emilio): Investigate the compat situation of the above check, maybe we
// can just check for empty src attribute or something...
auto* image = HTMLImageElement::FromNode(mContent);
return image && image->IsAwaitingLoadOrLazyLoading();
}
bool nsImageFrame::UpdateIntrinsicSize() {
IntrinsicSize oldIntrinsicSize = mIntrinsicSize;
mIntrinsicSize =
ComputeIntrinsicSize(mImage, ShouldUseMappedAspectRatio(), mKind, *this);
return mIntrinsicSize != oldIntrinsicSize;
}
static AspectRatio ComputeIntrinsicRatio(imgIContainer* aImage,
bool aUseMappedRatio,
const nsImageFrame& aFrame) {
const ComputedStyle& style = *aFrame.Style();
if (style.StyleDisplay()->IsContainSize()) {
return AspectRatio();
}
if (aImage) {
if (Maybe<AspectRatio> fromImage = aImage->GetIntrinsicRatio()) {
return *fromImage;
}
}
if (aUseMappedRatio) {
const StyleAspectRatio& ratio = style.StylePosition()->mAspectRatio;
if (ratio.auto_ && ratio.HasRatio()) {
// Return the mapped intrinsic aspect ratio stored in
// nsStylePosition::mAspectRatio.
return ratio.ratio.AsRatio().ToLayoutRatio(UseBoxSizing::Yes);
}
}
if (aFrame.ShouldShowBrokenImageIcon()) {
return AspectRatio(1.0f);
}
return AspectRatio();
}
bool nsImageFrame::UpdateIntrinsicRatio() {
AspectRatio oldIntrinsicRatio = mIntrinsicRatio;
mIntrinsicRatio =
ComputeIntrinsicRatio(mImage, ShouldUseMappedAspectRatio(), *this);
return mIntrinsicRatio != oldIntrinsicRatio;
}
bool nsImageFrame::GetSourceToDestTransform(nsTransform2D& aTransform) {
// First, figure out destRect (the rect we're rendering into).
// NOTE: We use mComputedSize instead of just GetInnerArea()'s own size here,
// because GetInnerArea() might be smaller if we're fragmented, whereas
// mComputedSize has our full content-box size (which we need for
// ComputeObjectDestRect to work correctly).
nsRect constraintRect(GetInnerArea().TopLeft(), mComputedSize);
constraintRect.y -= GetContinuationOffset();
nsRect destRect = nsLayoutUtils::ComputeObjectDestRect(
constraintRect, mIntrinsicSize, mIntrinsicRatio, StylePosition());
// Set the translation components, based on destRect
// XXXbz does this introduce rounding errors because of the cast to
// float? Should we just manually add that stuff in every time
// instead?
aTransform.SetToTranslate(float(destRect.x), float(destRect.y));
// NOTE(emilio): This intrinsicSize is not the same as the layout intrinsic
// size (mIntrinsicSize), which can be scaled due to ResponsiveImageSelector,
// see ScaleIntrinsicSizeForDensity.
nsSize intrinsicSize;
if (!mImage || !NS_SUCCEEDED(mImage->GetIntrinsicSize(&intrinsicSize)) ||
intrinsicSize.IsEmpty()) {
return false;
}
aTransform.SetScale(float(destRect.width) / float(intrinsicSize.width),
float(destRect.height) / float(intrinsicSize.height));
return true;
}
// This function checks whether the given request is the current request for our
// mContent.
bool nsImageFrame::IsPendingLoad(imgIRequest* aRequest) const {
// Default to pending load in case of errors
if (mKind != Kind::ImageElement) {
MOZ_ASSERT(aRequest == mContentURLRequest);
return false;
}
nsCOMPtr<nsIImageLoadingContent> imageLoader(do_QueryInterface(mContent));
MOZ_ASSERT(imageLoader);
int32_t requestType = nsIImageLoadingContent::UNKNOWN_REQUEST;
imageLoader->GetRequestType(aRequest, &requestType);
return requestType != nsIImageLoadingContent::CURRENT_REQUEST;
}
nsRect nsImageFrame::SourceRectToDest(const nsIntRect& aRect) {
// When scaling the image, row N of the source image may (depending on
// the scaling function) be used to draw any row in the destination image
// between floor(F * (N-1)) and ceil(F * (N+1)), where F is the
// floating-point scaling factor. The same holds true for columns.
// So, we start by computing that bound without the floor and ceiling.
nsRect r(nsPresContext::CSSPixelsToAppUnits(aRect.x - 1),
nsPresContext::CSSPixelsToAppUnits(aRect.y - 1),
nsPresContext::CSSPixelsToAppUnits(aRect.width + 2),
nsPresContext::CSSPixelsToAppUnits(aRect.height + 2));
nsTransform2D sourceToDest;
if (!GetSourceToDestTransform(sourceToDest)) {
// Failed to generate transform matrix. Return our whole inner area,
// to be on the safe side (since this method is used for generating
// invalidation rects).
return GetInnerArea();
}
sourceToDest.TransformCoord(&r.x, &r.y, &r.width, &r.height);
// Now, round the edges out to the pixel boundary.
nscoord scale = nsPresContext::CSSPixelsToAppUnits(1);
nscoord right = r.x + r.width;
nscoord bottom = r.y + r.height;
r.x -= (scale + (r.x % scale)) % scale;
r.y -= (scale + (r.y % scale)) % scale;
r.width = right + ((scale - (right % scale)) % scale) - r.x;
r.height = bottom + ((scale - (bottom % scale)) % scale) - r.y;
return r;
}
static bool ImageOk(EventStates aState) {
return !aState.HasState(NS_EVENT_STATE_BROKEN);
}
static bool HasAltText(const Element& aElement) {
// We always return some alternate text for <input>, see
// nsCSSFrameConstructor::GetAlternateTextFor.
if (aElement.IsHTMLElement(nsGkAtoms::input)) {
return true;
}
MOZ_ASSERT(aElement.IsHTMLElement(nsGkAtoms::img));
return aElement.HasNonEmptyAttr(nsGkAtoms::alt);
}
// Check if we want to use an image frame or just let the frame constructor make
// us into an inline.
/* static */
bool nsImageFrame::ShouldCreateImageFrameFor(const Element& aElement,
ComputedStyle& aStyle) {
if (ImageOk(aElement.State())) {
// Image is fine or loading; do the image frame thing
return true;
}
if (aStyle.StyleUIReset()->mMozForceBrokenImageIcon) {
return true;
}
// if our "do not show placeholders" pref is set, skip the icon
if (gIconLoad && gIconLoad->mPrefForceInlineAltText) {
return false;
}
if (!HasAltText(aElement)) {
return true;
}
if (aElement.OwnerDoc()->GetCompatibilityMode() == eCompatibility_NavQuirks) {
// FIXME(emilio): We definitely don't reframe when this changes...
return HaveSpecifiedSize(aStyle.StylePosition());
}
return false;
}
void nsImageFrame::Notify(imgIRequest* aRequest, int32_t aType,
const nsIntRect* aRect) {
if (aType == imgINotificationObserver::SIZE_AVAILABLE) {
nsCOMPtr<imgIContainer> image;
aRequest->GetImage(getter_AddRefs(image));
return OnSizeAvailable(aRequest, image);
}
if (aType == imgINotificationObserver::FRAME_UPDATE) {
return OnFrameUpdate(aRequest, aRect);
}
if (aType == imgINotificationObserver::FRAME_COMPLETE) {
mFirstFrameComplete = true;
}
if (aType == imgINotificationObserver::IS_ANIMATED &&
mKind != Kind::ImageElement) {
nsLayoutUtils::RegisterImageRequest(PresContext(), mContentURLRequest,
&mContentURLRequestRegistered);
}
if (aType == imgINotificationObserver::LOAD_COMPLETE) {
uint32_t imgStatus;
aRequest->GetImageStatus(&imgStatus);
nsresult status =
imgStatus & imgIRequest::STATUS_ERROR ? NS_ERROR_FAILURE : NS_OK;
return OnLoadComplete(aRequest, status);
}
}
void nsImageFrame::OnSizeAvailable(imgIRequest* aRequest,
imgIContainer* aImage) {
if (!aImage) {
return;
}
/* Get requested animation policy from the pres context:
* normal = 0
* one frame = 1
* one loop = 2
*/
aImage->SetAnimationMode(PresContext()->ImageAnimationMode());
if (IsPendingLoad(aRequest)) {
// We don't care
return;
}
UpdateImage(aRequest, aImage);
}
void nsImageFrame::UpdateImage(imgIRequest* aRequest, imgIContainer* aImage) {
MOZ_ASSERT(aRequest);
if (SizeIsAvailable(aRequest)) {
// This is valid and for the current request, so update our stored image
// container, orienting according to our style.
mImage = nsLayoutUtils::OrientImage(aImage,
StyleVisibility()->mImageOrientation);
MOZ_ASSERT(mImage);
} else {
// We no longer have a valid image, so release our stored image container.
mImage = mPrevImage = nullptr;
if (mKind == Kind::ListStyleImage) {
auto* genContent = static_cast<GeneratedImageContent*>(GetContent());
genContent->NotifyLoadFailed();
// No need to continue below since the above state change will destroy
// this frame.
return;
}
}
// NOTE(emilio): Intentionally using `|` instead of `||` to avoid
// short-circuiting.
bool intrinsicSizeChanged = UpdateIntrinsicSize() | UpdateIntrinsicRatio();
if (!GotInitialReflow()) {
return;
}
// We're going to need to repaint now either way.
InvalidateFrame();
if (intrinsicSizeChanged) {
// Now we need to reflow if we have an unconstrained size and have
// already gotten the initial reflow.
if (!(mState & IMAGE_SIZECONSTRAINED)) {
#ifdef ACCESSIBILITY
if (mKind != Kind::ListStyleImage) {
if (nsAccessibilityService* accService = GetAccService()) {
accService->NotifyOfImageSizeAvailable(PresShell(), mContent);
}
}
#endif
PresShell()->FrameNeedsReflow(this, IntrinsicDirty::StyleChange,
NS_FRAME_IS_DIRTY);
} else if (PresShell()->IsActive()) {
// We've already gotten the initial reflow, and our size hasn't changed,
// so we're ready to request a decode.
MaybeDecodeForPredictedSize();
}
}
}
void nsImageFrame::OnFrameUpdate(imgIRequest* aRequest,
const nsIntRect* aRect) {
if (NS_WARN_IF(!aRect)) {
return;
}
if (!GotInitialReflow()) {
// Don't bother to do anything; we have a reflow coming up!
return;
}
if (mFirstFrameComplete && !StyleVisibility()->IsVisible()) {
return;
}
if (IsPendingLoad(aRequest)) {
// We don't care
return;
}
nsIntRect layerInvalidRect =
mImage ? mImage->GetImageSpaceInvalidationRect(*aRect) : *aRect;
if (layerInvalidRect.IsEqualInterior(GetMaxSizedIntRect())) {
// Invalidate our entire area.
InvalidateSelf(nullptr, nullptr);
return;
}
nsRect frameInvalidRect = SourceRectToDest(layerInvalidRect);
InvalidateSelf(&layerInvalidRect, &frameInvalidRect);
}
void nsImageFrame::InvalidateSelf(const nsIntRect* aLayerInvalidRect,
const nsRect* aFrameInvalidRect) {
// Check if WebRender has interacted with this frame. If it has
// we need to let it know that things have changed.
const auto type = DisplayItemType::TYPE_IMAGE;
const auto producerId =
mImage ? mImage->GetProducerId() : kContainerProducerID_Invalid;
if (WebRenderUserData::ProcessInvalidateForImage(this, type, producerId)) {
return;
}
InvalidateLayer(type, aLayerInvalidRect, aFrameInvalidRect);
if (!mFirstFrameComplete) {
InvalidateLayer(DisplayItemType::TYPE_ALT_FEEDBACK, aLayerInvalidRect,
aFrameInvalidRect);
}
}
void nsImageFrame::OnLoadComplete(imgIRequest* aRequest, nsresult aStatus) {
NotifyNewCurrentRequest(aRequest, aStatus);
}
void nsImageFrame::ResponsiveContentDensityChanged() {
if (!GotInitialReflow()) {
return;
}
if (!mImage) {
return;
}
if (!UpdateIntrinsicSize() && !UpdateIntrinsicRatio()) {
return;
}
PresShell()->FrameNeedsReflow(this, IntrinsicDirty::StyleChange,
NS_FRAME_IS_DIRTY);
}
void nsImageFrame::NotifyNewCurrentRequest(imgIRequest* aRequest,
nsresult aStatus) {
nsCOMPtr<imgIContainer> image;
aRequest->GetImage(getter_AddRefs(image));
NS_ASSERTION(image || NS_FAILED(aStatus),
"Successful load with no container?");
UpdateImage(aRequest, image);
}
void nsImageFrame::MaybeDecodeForPredictedSize() {
// Check that we're ready to decode.
if (!mImage) {
return; // Nothing to do yet.
}
if (mComputedSize.IsEmpty()) {
return; // We won't draw anything, so no point in decoding.
}
if (GetVisibility() != Visibility::ApproximatelyVisible) {
return; // We're not visible, so don't decode.
}
// OK, we're ready to decode. Compute the scale to the screen...
mozilla::PresShell* presShell = PresContext()->PresShell();
LayoutDeviceToScreenScale2D resolutionToScreen(
presShell->GetCumulativeResolution() *
nsLayoutUtils::GetTransformToAncestorScaleExcludingAnimated(this));
// ...and this frame's content box...
const nsPoint offset =
GetOffsetToCrossDoc(nsLayoutUtils::GetReferenceFrame(this));
const nsRect frameContentBox = GetInnerArea() + offset;
// ...and our predicted dest rect...
const int32_t factor = PresContext()->AppUnitsPerDevPixel();
const LayoutDeviceRect destRect = LayoutDeviceRect::FromAppUnits(
PredictedDestRect(frameContentBox), factor);
// ...and use them to compute our predicted size in screen pixels.
const ScreenSize predictedScreenSize = destRect.Size() * resolutionToScreen;
const ScreenIntSize predictedScreenIntSize =
RoundedToInt(predictedScreenSize);
if (predictedScreenIntSize.IsEmpty()) {
return;
}
// Determine the optimal image size to use.
uint32_t flags = imgIContainer::FLAG_HIGH_QUALITY_SCALING |
imgIContainer::FLAG_ASYNC_NOTIFY;
SamplingFilter samplingFilter =
nsLayoutUtils::GetSamplingFilterForFrame(this);
gfxSize gfxPredictedScreenSize =
gfxSize(predictedScreenIntSize.width, predictedScreenIntSize.height);
nsIntSize predictedImageSize = mImage->OptimalImageSizeForDest(
gfxPredictedScreenSize, imgIContainer::FRAME_CURRENT, samplingFilter,
flags);
// Request a decode.
mImage->RequestDecodeForSize(predictedImageSize, flags);
}
nsRect nsImageFrame::PredictedDestRect(const nsRect& aFrameContentBox) {
// Note: To get the "dest rect", we have to provide the "constraint rect"
// (which is the content-box, with the effects of fragmentation undone).
nsRect constraintRect(aFrameContentBox.TopLeft(), mComputedSize);
constraintRect.y -= GetContinuationOffset();
return nsLayoutUtils::ComputeObjectDestRect(constraintRect, mIntrinsicSize,
mIntrinsicRatio, StylePosition());
}
bool nsImageFrame::IsForMarkerPseudo() const {
if (mKind == Kind::ImageElement) {
return false;
}
auto* subtreeRoot = GetContent()->GetClosestNativeAnonymousSubtreeRoot();
return subtreeRoot && subtreeRoot->IsGeneratedContentContainerForMarker();
}
void nsImageFrame::EnsureIntrinsicSizeAndRatio() {
if (StyleDisplay()->IsContainSize()) {
// If we have 'contain:size', then our intrinsic size and ratio are 0,0
// regardless of what our underlying image may think.
mIntrinsicSize = IntrinsicSize(0, 0);
mIntrinsicRatio = AspectRatio();
return;
}
// If mIntrinsicSize.width and height are 0, then we need to update from the
// image container. Note that we handle ::marker intrinsic size/ratio in
// DidSetComputedStyle.
if (mIntrinsicSize != IntrinsicSize(0, 0) && !IsForMarkerPseudo()) {
return;
}
UpdateIntrinsicSize();
UpdateIntrinsicRatio();
}
nsIFrame::SizeComputationResult nsImageFrame::ComputeSize(
gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
nscoord aAvailableISize, const LogicalSize& aMargin,
const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
ComputeSizeFlags aFlags) {
EnsureIntrinsicSizeAndRatio();
return {ComputeSizeWithIntrinsicDimensions(
aRenderingContext, aWM, mIntrinsicSize, GetAspectRatio(), aCBSize,
aMargin, aBorderPadding, aSizeOverrides, aFlags),
AspectRatioUsage::None};
}
// XXXdholbert This function's clients should probably just be calling
// GetContentRectRelativeToSelf() directly.
nsRect nsImageFrame::GetInnerArea() const {
return GetContentRectRelativeToSelf();
}
Element* nsImageFrame::GetMapElement() const {
nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(mContent);
return imageLoader ? static_cast<nsImageLoadingContent*>(imageLoader.get())
->FindImageMap()
: nullptr;
}
// get the offset into the content area of the image where aImg starts if it is
// a continuation.
nscoord nsImageFrame::GetContinuationOffset() const {
nscoord offset = 0;
for (nsIFrame* f = GetPrevInFlow(); f; f = f->GetPrevInFlow()) {
offset += f->GetContentRect().height;
}
NS_ASSERTION(offset >= 0, "bogus GetContentRect");
return offset;
}
nscoord nsImageFrame::GetMinISize(gfxContext* aRenderingContext) {
// XXX The caller doesn't account for constraints of the block-size,
// min-block-size, and max-block-size properties.
DebugOnly<nscoord> result;
DISPLAY_MIN_INLINE_SIZE(this, result);
EnsureIntrinsicSizeAndRatio();
const auto& iSize = GetWritingMode().IsVertical() ? mIntrinsicSize.height
: mIntrinsicSize.width;
return iSize.valueOr(0);
}
nscoord nsImageFrame::GetPrefISize(gfxContext* aRenderingContext) {
// XXX The caller doesn't account for constraints of the block-size,
// min-block-size, and max-block-size properties.
DebugOnly<nscoord> result;
DISPLAY_PREF_INLINE_SIZE(this, result);
EnsureIntrinsicSizeAndRatio();
const auto& iSize = GetWritingMode().IsVertical() ? mIntrinsicSize.height
: mIntrinsicSize.width;
// convert from normal twips to scaled twips (printing...)
return iSize.valueOr(0);
}
void nsImageFrame::Reflow(nsPresContext* aPresContext, ReflowOutput& aMetrics,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MarkInReflow();
DO_GLOBAL_REFLOW_COUNT("nsImageFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aMetrics, aStatus);
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
NS_FRAME_TRACE(
NS_FRAME_TRACE_CALLS,
("enter nsImageFrame::Reflow: availSize=%d,%d",
aReflowInput.AvailableWidth(), aReflowInput.AvailableHeight()));
MOZ_ASSERT(mState & NS_FRAME_IN_REFLOW, "frame is not in reflow");
// see if we have a frozen size (i.e. a fixed width and height)
if (!SizeDependsOnIntrinsicSize(aReflowInput)) {
AddStateBits(IMAGE_SIZECONSTRAINED);
} else {
RemoveStateBits(IMAGE_SIZECONSTRAINED);
}
mComputedSize =
nsSize(aReflowInput.ComputedWidth(), aReflowInput.ComputedHeight());
aMetrics.Width() = mComputedSize.width;
aMetrics.Height() = mComputedSize.height;
// add borders and padding
aMetrics.Width() += aReflowInput.ComputedPhysicalBorderPadding().LeftRight();
aMetrics.Height() += aReflowInput.ComputedPhysicalBorderPadding().TopBottom();
if (GetPrevInFlow()) {
aMetrics.Width() = GetPrevInFlow()->GetSize().width;
nscoord y = GetContinuationOffset();
aMetrics.Height() -= y + aReflowInput.ComputedPhysicalBorderPadding().top;
aMetrics.Height() = std::max(0, aMetrics.Height());
}
// we have to split images if we are:
// in Paginated mode, we need to have a constrained height, and have a height
// larger than our available height
uint32_t loadStatus = imgIRequest::STATUS_NONE;
if (nsCOMPtr<imgIRequest> currentRequest = GetCurrentRequest()) {
currentRequest->GetImageStatus(&loadStatus);
}
if (aPresContext->IsPaginated() &&
((loadStatus & imgIRequest::STATUS_SIZE_AVAILABLE) ||
(mState & IMAGE_SIZECONSTRAINED)) &&
NS_UNCONSTRAINEDSIZE != aReflowInput.AvailableHeight() &&
aMetrics.Height() > aReflowInput.AvailableHeight()) {
// our desired height was greater than 0, so to avoid infinite
// splitting, use 1 pixel as the min
aMetrics.Height() = std::max(nsPresContext::CSSPixelsToAppUnits(1),
aReflowInput.AvailableHeight());
aStatus.SetIncomplete();
}
aMetrics.SetOverflowAreasToDesiredBounds();
bool imageOK =
mKind != Kind::ImageElement || ImageOk(mContent->AsElement()->State());
// Determine if the size is available
bool haveSize = false;
if (loadStatus & imgIRequest::STATUS_SIZE_AVAILABLE) {
haveSize = true;
}
if (!imageOK || !haveSize) {
nsRect altFeedbackSize(
0, 0,
nsPresContext::CSSPixelsToAppUnits(
ICON_SIZE + 2 * (ICON_PADDING + ALT_BORDER_WIDTH)),
nsPresContext::CSSPixelsToAppUnits(
ICON_SIZE + 2 * (ICON_PADDING + ALT_BORDER_WIDTH)));
// We include the altFeedbackSize in our ink overflow, but not in our
// scrollable overflow, since it doesn't really need to be scrolled to
// outside the image.
nsRect& inkOverflow = aMetrics.InkOverflow();
inkOverflow.UnionRect(inkOverflow, altFeedbackSize);
} else if (PresShell()->IsActive()) {
// We've just reflowed and we should have an accurate size, so we're ready
// to request a decode.
MaybeDecodeForPredictedSize();
}
FinishAndStoreOverflow(&aMetrics, aReflowInput.mStyleDisplay);
if (HasAnyStateBits(NS_FRAME_FIRST_REFLOW) && !mReflowCallbackPosted) {
mReflowCallbackPosted = true;
PresShell()->PostReflowCallback(this);
}
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS, ("exit nsImageFrame::Reflow: size=%d,%d",
aMetrics.Width(), aMetrics.Height()));
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aMetrics);
}
bool nsImageFrame::ReflowFinished() {
mReflowCallbackPosted = false;
// XXX(seth): We don't need this. The purpose of updating visibility
// synchronously is to ensure that animated images start animating
// immediately. In the short term, however,
// nsImageLoadingContent::OnUnlockedDraw() is enough to ensure that
// animations start as soon as the image is painted for the first time, and in
// the long term we want to update visibility information from the display
// list whenever we paint, so we don't actually need to do this. However, to
// avoid behavior changes during the transition from the old image visibility
// code, we'll leave it in for now.
UpdateVisibilitySynchronously();
return false;
}
void nsImageFrame::ReflowCallbackCanceled() { mReflowCallbackPosted = false; }
// Computes the width of the specified string. aMaxWidth specifies the maximum
// width available. Once this limit is reached no more characters are measured.
// The number of characters that fit within the maximum width are returned in
// aMaxFit. NOTE: it is assumed that the fontmetrics have already been selected
// into the rendering context before this is called (for performance). MMP
nscoord nsImageFrame::MeasureString(const char16_t* aString, int32_t aLength,
nscoord aMaxWidth, uint32_t& aMaxFit,
gfxContext& aContext,
nsFontMetrics& aFontMetrics) {
nscoord totalWidth = 0;
aFontMetrics.SetTextRunRTL(false);
nscoord spaceWidth = aFontMetrics.SpaceWidth();
aMaxFit = 0;
while (aLength > 0) {
// Find the next place we can line break
uint32_t len = aLength;
bool trailingSpace = false;
for (int32_t i = 0; i < aLength; i++) {
if (dom::IsSpaceCharacter(aString[i]) && (i > 0)) {
len = i; // don't include the space when measuring
trailingSpace = true;
break;
}
}
// Measure this chunk of text, and see if it fits
nscoord width = nsLayoutUtils::AppUnitWidthOfStringBidi(
aString, len, this, aFontMetrics, aContext);
bool fits = (totalWidth + width) <= aMaxWidth;
// If it fits on the line, or it's the first word we've processed then
// include it
if (fits || (0 == totalWidth)) {
// New piece fits
totalWidth += width;
// If there's a trailing space then see if it fits as well
if (trailingSpace) {
if ((totalWidth + spaceWidth) <= aMaxWidth) {
totalWidth += spaceWidth;
} else {
// Space won't fit. Leave it at the end but don't include it in
// the width
fits = false;
}
len++;
}
aMaxFit += len;
aString += len;
aLength -= len;
}
if (!fits) {
break;
}
}
return totalWidth;
}
// Formats the alt-text to fit within the specified rectangle. Breaks lines
// between words if a word would extend past the edge of the rectangle
void nsImageFrame::DisplayAltText(nsPresContext* aPresContext,
gfxContext& aRenderingContext,
const nsString& aAltText,
const nsRect& aRect) {
// Set font and color
aRenderingContext.SetColor(
sRGBColor::FromABGR(StyleText()->mColor.ToColor()));
RefPtr<nsFontMetrics> fm =
nsLayoutUtils::GetInflatedFontMetricsForFrame(this);
// Format the text to display within the formatting rect
nscoord maxAscent = fm->MaxAscent();
nscoord maxDescent = fm->MaxDescent();
nscoord lineHeight = fm->MaxHeight(); // line-relative, so an x-coordinate
// length if writing mode is vertical
WritingMode wm = GetWritingMode();
bool isVertical = wm.IsVertical();
fm->SetVertical(isVertical);
fm->SetTextOrientation(StyleVisibility()->mTextOrientation);
// XXX It would be nice if there was a way to have the font metrics tell
// use where to break the text given a maximum width. At a minimum we need
// to be able to get the break character...
const char16_t* str = aAltText.get();
int32_t strLen = aAltText.Length();
nsPoint pt = wm.IsVerticalRL() ? aRect.TopRight() - nsPoint(lineHeight, 0)
: aRect.TopLeft();
nscoord iSize = isVertical ? aRect.height : aRect.width;
if (!aPresContext->BidiEnabled() && HasRTLChars(aAltText)) {
aPresContext->SetBidiEnabled();
}
// Always show the first line, even if we have to clip it below
bool firstLine = true;
while (strLen > 0) {
if (!firstLine) {
// If we've run out of space, break out of the loop
if ((!isVertical && (pt.y + maxDescent) >= aRect.YMost()) ||
(wm.IsVerticalRL() && (pt.x + maxDescent < aRect.x)) ||
(wm.IsVerticalLR() && (pt.x + maxDescent >= aRect.XMost()))) {
break;
}
}
// Determine how much of the text to display on this line
uint32_t maxFit; // number of characters that fit
nscoord strWidth =
MeasureString(str, strLen, iSize, maxFit, aRenderingContext, *fm);
// Display the text
nsresult rv = NS_ERROR_FAILURE;
if (aPresContext->BidiEnabled()) {
nsBidiDirection dir;
nscoord x, y;
if (isVertical) {
x = pt.x + maxDescent;
if (wm.IsBidiLTR()) {
y = aRect.y;
dir = NSBIDI_LTR;
} else {
y = aRect.YMost() - strWidth;
dir = NSBIDI_RTL;
}
} else {
y = pt.y + maxAscent;
if (wm.IsBidiLTR()) {
x = aRect.x;
dir = NSBIDI_LTR;
} else {
x = aRect.XMost() - strWidth;
dir = NSBIDI_RTL;
}
}
rv = nsBidiPresUtils::RenderText(
str, maxFit, dir, aPresContext, aRenderingContext,
aRenderingContext.GetDrawTarget(), *fm, x, y);
}
if (NS_FAILED(rv)) {
nsLayoutUtils::DrawUniDirString(str, maxFit,
isVertical
? nsPoint(pt.x + maxDescent, pt.y)
: nsPoint(pt.x, pt.y + maxAscent),
*fm, aRenderingContext);
}
// Move to the next line
str += maxFit;
strLen -= maxFit;
if (wm.IsVerticalRL()) {
pt.x -= lineHeight;
} else if (wm.IsVerticalLR()) {
pt.x += lineHeight;
} else {
pt.y += lineHeight;
}
firstLine = false;
}
}
struct nsRecessedBorder : public nsStyleBorder {
nsRecessedBorder(nscoord aBorderWidth, nsPresContext* aPresContext)
: nsStyleBorder(*aPresContext->Document()) {
for (const auto side : mozilla::AllPhysicalSides()) {
BorderColorFor(side) = StyleColor::Black();
mBorder.Side(side) = aBorderWidth;
// Note: use SetBorderStyle here because we want to affect
// mComputedBorder
SetBorderStyle(side, StyleBorderStyle::Inset);
}
}
};
class nsDisplayAltFeedback final : public nsPaintedDisplayItem {
public:
nsDisplayAltFeedback(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
: nsPaintedDisplayItem(aBuilder, aFrame) {}
nsDisplayItemGeometry* AllocateGeometry(
nsDisplayListBuilder* aBuilder) final {
return new nsDisplayItemGenericImageGeometry(this, aBuilder);
}
void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const final {
auto geometry =
static_cast<const nsDisplayItemGenericImageGeometry*>(aGeometry);
if (aBuilder->ShouldSyncDecodeImages() &&
geometry->ShouldInvalidateToSyncDecodeImages()) {
bool snap;
aInvalidRegion->Or(*aInvalidRegion, GetBounds(aBuilder, &snap));
}
nsDisplayItem::ComputeInvalidationRegion(aBuilder, aGeometry,
aInvalidRegion);
}