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gecko-dev/layout/painting/nsImageRenderer.cpp

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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/. */
/* utility code for drawing images as CSS borders, backgrounds, and shapes. */
#include "nsImageRenderer.h"
#include "mozilla/webrender/WebRenderAPI.h"
#include "gfxContext.h"
#include "gfxDrawable.h"
#include "ImageOps.h"
#include "ImageRegion.h"
#include "mozilla/layers/RenderRootStateManager.h"
#include "mozilla/layers/StackingContextHelper.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "nsContentUtils.h"
#include "nsCSSRendering.h"
#include "nsCSSRenderingGradients.h"
#include "nsDeviceContext.h"
#include "nsIFrame.h"
#include "nsStyleStructInlines.h"
#include "nsSVGDisplayableFrame.h"
#include "SVGObserverUtils.h"
#include "nsSVGIntegrationUtils.h"
using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::image;
using namespace mozilla::layers;
nsSize CSSSizeOrRatio::ComputeConcreteSize() const {
NS_ASSERTION(CanComputeConcreteSize(), "Cannot compute");
if (mHasWidth && mHasHeight) {
return nsSize(mWidth, mHeight);
}
if (mHasWidth) {
return nsSize(mWidth, mRatio.Inverted().ApplyTo(mWidth));
}
MOZ_ASSERT(mHasHeight);
return nsSize(mRatio.ApplyTo(mHeight), mHeight);
}
nsImageRenderer::nsImageRenderer(nsIFrame* aForFrame,
const nsStyleImage* aImage, uint32_t aFlags)
: mForFrame(aForFrame),
mImage(aImage),
mType(aImage->GetType()),
mImageContainer(nullptr),
mGradientData(nullptr),
mPaintServerFrame(nullptr),
mPrepareResult(ImgDrawResult::NOT_READY),
mSize(0, 0),
mFlags(aFlags),
mExtendMode(ExtendMode::CLAMP),
mMaskOp(StyleMaskMode::MatchSource) {}
static bool ShouldTreatAsCompleteDueToSyncDecode(const nsStyleImage* aImage,
uint32_t aFlags) {
if (!(aFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES)) {
return false;
}
if (aImage->GetType() != eStyleImageType_Image) {
return false;
}
imgRequestProxy* req = aImage->GetImageData();
if (!req) {
return false;
}
uint32_t status = 0;
if (NS_FAILED(req->GetImageStatus(&status))) {
return false;
}
if (status & imgIRequest::STATUS_ERROR) {
// The image is "complete" since it's a corrupt image. If we created an
// imgIContainer at all, return true.
nsCOMPtr<imgIContainer> image;
req->GetImage(getter_AddRefs(image));
return bool(image);
}
if (!(status & imgIRequest::STATUS_LOAD_COMPLETE)) {
// We must have loaded all of the image's data and the size must be
// available, or else sync decoding won't be able to decode the image.
return false;
}
return true;
}
bool nsImageRenderer::PrepareImage() {
if (mImage->IsEmpty() ||
(mType == eStyleImageType_Image && !mImage->GetImageData())) {
// mImage->GetImageData() could be null here if the nsStyleImage refused
// to load a same-document URL.
mPrepareResult = ImgDrawResult::BAD_IMAGE;
return false;
}
if (!mImage->IsComplete()) {
// Make sure the image is actually decoding.
bool frameComplete = mImage->StartDecoding();
// Boost the loading priority since we know we want to draw the image.
if ((mFlags & nsImageRenderer::FLAG_PAINTING_TO_WINDOW) &&
mType == eStyleImageType_Image) {
MOZ_ASSERT(mImage->GetImageData(),
"must have image data, since we checked above");
mImage->GetImageData()->BoostPriority(imgIRequest::CATEGORY_DISPLAY);
}
// Check again to see if we finished.
// We cannot prepare the image for rendering if it is not fully loaded.
// Special case: If we requested a sync decode and the image has loaded,
// push on through because the Draw() will do a sync decode then.
if (!(frameComplete || mImage->IsComplete()) &&
!ShouldTreatAsCompleteDueToSyncDecode(mImage, mFlags)) {
mPrepareResult = ImgDrawResult::NOT_READY;
return false;
}
}
switch (mType) {
case eStyleImageType_Image: {
MOZ_ASSERT(mImage->GetImageData(),
"must have image data, since we checked above");
nsCOMPtr<imgIContainer> srcImage;
DebugOnly<nsresult> rv =
mImage->GetImageData()->GetImage(getter_AddRefs(srcImage));
MOZ_ASSERT(NS_SUCCEEDED(rv) && srcImage,
"If GetImage() is failing, mImage->IsComplete() "
"should have returned false");
if (!mImage->GetCropRect()) {
mImageContainer.swap(srcImage);
} else {
nsIntRect actualCropRect;
bool isEntireImage;
bool success =
mImage->ComputeActualCropRect(actualCropRect, &isEntireImage);
if (!success || actualCropRect.IsEmpty()) {
// The cropped image has zero size
mPrepareResult = ImgDrawResult::BAD_IMAGE;
return false;
}
if (isEntireImage) {
// The cropped image is identical to the source image
mImageContainer.swap(srcImage);
} else {
nsCOMPtr<imgIContainer> subImage =
ImageOps::Clip(srcImage, actualCropRect, Nothing());
mImageContainer.swap(subImage);
}
}
mPrepareResult = ImgDrawResult::SUCCESS;
break;
}
case eStyleImageType_Gradient:
mGradientData = &mImage->GetGradient();
mPrepareResult = ImgDrawResult::SUCCESS;
break;
case eStyleImageType_Element: {
Element* paintElement = // may be null
SVGObserverUtils::GetAndObserveBackgroundImage(
mForFrame->FirstContinuation(), mImage->GetElementId());
// If the referenced element is an <img>, <canvas>, or <video> element,
// prefer SurfaceFromElement as it's more reliable.
mImageElementSurface = nsLayoutUtils::SurfaceFromElement(paintElement);
if (!mImageElementSurface.GetSourceSurface()) {
nsIFrame* paintServerFrame =
paintElement ? paintElement->GetPrimaryFrame() : nullptr;
// If there's no referenced frame, or the referenced frame is
// non-displayable SVG, then we have nothing valid to paint.
if (!paintServerFrame ||
(paintServerFrame->IsFrameOfType(nsIFrame::eSVG) &&
!paintServerFrame->IsFrameOfType(nsIFrame::eSVGPaintServer) &&
!static_cast<nsSVGDisplayableFrame*>(
do_QueryFrame(paintServerFrame)))) {
mPrepareResult = ImgDrawResult::BAD_IMAGE;
return false;
}
mPaintServerFrame = paintServerFrame;
}
mPrepareResult = ImgDrawResult::SUCCESS;
break;
}
case eStyleImageType_Null:
default:
break;
}
return IsReady();
}
CSSSizeOrRatio nsImageRenderer::ComputeIntrinsicSize() {
NS_ASSERTION(IsReady(),
"Ensure PrepareImage() has returned true "
"before calling me");
CSSSizeOrRatio result;
switch (mType) {
case eStyleImageType_Image: {
bool haveWidth, haveHeight;
CSSIntSize imageIntSize;
nsLayoutUtils::ComputeSizeForDrawing(
mImageContainer, imageIntSize, result.mRatio, haveWidth, haveHeight);
if (haveWidth) {
result.SetWidth(nsPresContext::CSSPixelsToAppUnits(imageIntSize.width));
}
if (haveHeight) {
result.SetHeight(
nsPresContext::CSSPixelsToAppUnits(imageIntSize.height));
}
// If we know the aspect ratio and one of the dimensions,
// we can compute the other missing width or height.
if (!haveHeight && haveWidth && result.mRatio) {
nscoord intrinsicHeight =
result.mRatio.Inverted().ApplyTo(imageIntSize.width);
result.SetHeight(nsPresContext::CSSPixelsToAppUnits(intrinsicHeight));
} else if (haveHeight && !haveWidth && result.mRatio) {
nscoord intrinsicWidth = result.mRatio.ApplyTo(imageIntSize.height);
result.SetWidth(nsPresContext::CSSPixelsToAppUnits(intrinsicWidth));
}
break;
}
case eStyleImageType_Element: {
// XXX element() should have the width/height of the referenced element,
// and that element's ratio, if it matches. If it doesn't match, it
// should have no width/height or ratio. See element() in CSS images:
// <http://dev.w3.org/csswg/css-images-4/#element-notation>.
// Make sure to change nsStyleImageLayers::Size::DependsOnFrameSize
// when fixing this!
if (mPaintServerFrame) {
// SVG images have no intrinsic size
if (!mPaintServerFrame->IsFrameOfType(nsIFrame::eSVG)) {
// The intrinsic image size for a generic nsIFrame paint server is
// the union of the border-box rects of all of its continuations,
// rounded to device pixels.
int32_t appUnitsPerDevPixel =
mForFrame->PresContext()->AppUnitsPerDevPixel();
result.SetSize(IntSizeToAppUnits(
nsSVGIntegrationUtils::GetContinuationUnionSize(mPaintServerFrame)
.ToNearestPixels(appUnitsPerDevPixel),
appUnitsPerDevPixel));
}
} else {
NS_ASSERTION(mImageElementSurface.GetSourceSurface(),
"Surface should be ready.");
IntSize surfaceSize = mImageElementSurface.mSize;
result.SetSize(
nsSize(nsPresContext::CSSPixelsToAppUnits(surfaceSize.width),
nsPresContext::CSSPixelsToAppUnits(surfaceSize.height)));
}
break;
}
case eStyleImageType_Gradient:
// Per <http://dev.w3.org/csswg/css3-images/#gradients>, gradients have no
// intrinsic dimensions.
case eStyleImageType_Null:
default:
break;
}
return result;
}
/* static */
nsSize nsImageRenderer::ComputeConcreteSize(
const CSSSizeOrRatio& aSpecifiedSize, const CSSSizeOrRatio& aIntrinsicSize,
const nsSize& aDefaultSize) {
// The specified size is fully specified, just use that
if (aSpecifiedSize.IsConcrete()) {
return aSpecifiedSize.ComputeConcreteSize();
}
MOZ_ASSERT(!aSpecifiedSize.mHasWidth || !aSpecifiedSize.mHasHeight);
if (!aSpecifiedSize.mHasWidth && !aSpecifiedSize.mHasHeight) {
// no specified size, try using the intrinsic size
if (aIntrinsicSize.CanComputeConcreteSize()) {
return aIntrinsicSize.ComputeConcreteSize();
}
if (aIntrinsicSize.mHasWidth) {
return nsSize(aIntrinsicSize.mWidth, aDefaultSize.height);
}
if (aIntrinsicSize.mHasHeight) {
return nsSize(aDefaultSize.width, aIntrinsicSize.mHeight);
}
// couldn't use the intrinsic size either, revert to using the default size
return ComputeConstrainedSize(aDefaultSize, aIntrinsicSize.mRatio, CONTAIN);
}
MOZ_ASSERT(aSpecifiedSize.mHasWidth || aSpecifiedSize.mHasHeight);
// The specified height is partial, try to compute the missing part.
if (aSpecifiedSize.mHasWidth) {
nscoord height;
if (aIntrinsicSize.HasRatio()) {
height = aIntrinsicSize.mRatio.Inverted().ApplyTo(aSpecifiedSize.mWidth);
} else if (aIntrinsicSize.mHasHeight) {
height = aIntrinsicSize.mHeight;
} else {
height = aDefaultSize.height;
}
return nsSize(aSpecifiedSize.mWidth, height);
}
MOZ_ASSERT(aSpecifiedSize.mHasHeight);
nscoord width;
if (aIntrinsicSize.HasRatio()) {
width = aIntrinsicSize.mRatio.ApplyTo(aSpecifiedSize.mHeight);
} else if (aIntrinsicSize.mHasWidth) {
width = aIntrinsicSize.mWidth;
} else {
width = aDefaultSize.width;
}
return nsSize(width, aSpecifiedSize.mHeight);
}
/* static */
nsSize nsImageRenderer::ComputeConstrainedSize(
const nsSize& aConstrainingSize, const AspectRatio& aIntrinsicRatio,
FitType aFitType) {
if (!aIntrinsicRatio) {
return aConstrainingSize;
}
// Suppose we're doing a "contain" fit. If the image's aspect ratio has a
// "fatter" shape than the constraint area, then we need to use the
// constraint area's full width, and we need to use the aspect ratio to
// produce a height. On the other hand, if the aspect ratio is "skinnier", we
// use the constraint area's full height, and we use the aspect ratio to
// produce a width. (If instead we're doing a "cover" fit, then it can easily
// be seen that we should do precisely the opposite.)
//
// We check if the image's aspect ratio is "fatter" than the constraint area
// by simply applying the aspect ratio to the constraint area's height, to
// produce a "hypothetical width", and we check whether that
// aspect-ratio-provided "hypothetical width" is wider than the constraint
// area's actual width. If it is, then the aspect ratio is fatter than the
// constraint area.
//
// This is equivalent to the more descriptive alternative:
//
// AspectRatio::FromSize(aConstrainingSize) < aIntrinsicRatio
//
// But gracefully handling the case where one of the two dimensions from
// aConstrainingSize is zero. This is easy to prove since:
//
// aConstrainingSize.width / aConstrainingSize.height < aIntrinsicRatio
//
// Is trivially equivalent to:
//
// aIntrinsicRatio.width < aIntrinsicRatio * aConstrainingSize.height
//
// For the cases where height is not zero.
//
// We use float math here to avoid losing precision for very large backgrounds
// since we use saturating nscoord math otherwise.
const float constraintWidth = float(aConstrainingSize.width);
const float hypotheticalWidth =
aIntrinsicRatio.ApplyToFloat(aConstrainingSize.height);
nsSize size;
if ((aFitType == CONTAIN) == (constraintWidth < hypotheticalWidth)) {
size.width = aConstrainingSize.width;
size.height = aIntrinsicRatio.Inverted().ApplyTo(aConstrainingSize.width);
// If we're reducing the size by less than one css pixel, then just use the
// constraining size.
if (aFitType == CONTAIN &&
aConstrainingSize.height - size.height < AppUnitsPerCSSPixel()) {
size.height = aConstrainingSize.height;
}
} else {
size.height = aConstrainingSize.height;
size.width = aIntrinsicRatio.ApplyTo(aConstrainingSize.height);
if (aFitType == CONTAIN &&
aConstrainingSize.width - size.width < AppUnitsPerCSSPixel()) {
size.width = aConstrainingSize.width;
}
}
return size;
}
/**
* mSize is the image's "preferred" size for this particular rendering, while
* the drawn (aka concrete) size is the actual rendered size after accounting
* for background-size etc.. The preferred size is most often the image's
* intrinsic dimensions. But for images with incomplete intrinsic dimensions,
* the preferred size varies, depending on the specified and default sizes, see
* nsImageRenderer::Compute*Size.
*
* This distinction is necessary because the components of a vector image are
* specified with respect to its preferred size for a rendering situation, not
* to its actual rendered size. For example, consider a 4px wide background
* vector image with no height which contains a left-aligned
* 2px wide black rectangle with height 100%. If the background-size width is
* auto (or 4px), the vector image will render 4px wide, and the black rectangle
* will be 2px wide. If the background-size width is 8px, the vector image will
* render 8px wide, and the black rectangle will be 4px wide -- *not* 2px wide.
* In both cases mSize.width will be 4px; but in the first case the returned
* width will be 4px, while in the second case the returned width will be 8px.
*/
void nsImageRenderer::SetPreferredSize(const CSSSizeOrRatio& aIntrinsicSize,
const nsSize& aDefaultSize) {
mSize.width =
aIntrinsicSize.mHasWidth ? aIntrinsicSize.mWidth : aDefaultSize.width;
mSize.height =
aIntrinsicSize.mHasHeight ? aIntrinsicSize.mHeight : aDefaultSize.height;
}
// Convert from nsImageRenderer flags to the flags we want to use for drawing in
// the imgIContainer namespace.
static uint32_t ConvertImageRendererToDrawFlags(uint32_t aImageRendererFlags) {
uint32_t drawFlags = imgIContainer::FLAG_NONE;
if (aImageRendererFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES) {
drawFlags |= imgIContainer::FLAG_SYNC_DECODE;
}
if (aImageRendererFlags & nsImageRenderer::FLAG_PAINTING_TO_WINDOW) {
drawFlags |= imgIContainer::FLAG_HIGH_QUALITY_SCALING;
}
return drawFlags;
}
ImgDrawResult nsImageRenderer::Draw(nsPresContext* aPresContext,
gfxContext& aRenderingContext,
const nsRect& aDirtyRect,
const nsRect& aDest, const nsRect& aFill,
const nsPoint& aAnchor,
const nsSize& aRepeatSize,
const CSSIntRect& aSrc, float aOpacity) {
if (!IsReady()) {
MOZ_ASSERT_UNREACHABLE(
"Ensure PrepareImage() has returned true before "
"calling me");
return ImgDrawResult::TEMPORARY_ERROR;
}
if (aDest.IsEmpty() || aFill.IsEmpty() || mSize.width <= 0 ||
mSize.height <= 0) {
return ImgDrawResult::SUCCESS;
}
SamplingFilter samplingFilter =
nsLayoutUtils::GetSamplingFilterForFrame(mForFrame);
ImgDrawResult result = ImgDrawResult::SUCCESS;
RefPtr<gfxContext> ctx = &aRenderingContext;
IntRect tmpDTRect;
if (ctx->CurrentOp() != CompositionOp::OP_OVER ||
mMaskOp == StyleMaskMode::Luminance) {
gfxRect clipRect = ctx->GetClipExtents(gfxContext::eDeviceSpace);
tmpDTRect = RoundedOut(ToRect(clipRect));
if (tmpDTRect.IsEmpty()) {
return ImgDrawResult::SUCCESS;
}
RefPtr<DrawTarget> tempDT =
gfxPlatform::GetPlatform()->CreateSimilarSoftwareDrawTarget(
ctx->GetDrawTarget(), tmpDTRect.Size(), SurfaceFormat::B8G8R8A8);
if (!tempDT || !tempDT->IsValid()) {
gfxDevCrash(LogReason::InvalidContext)
<< "ImageRenderer::Draw problem " << gfx::hexa(tempDT);
return ImgDrawResult::TEMPORARY_ERROR;
}
tempDT->SetTransform(ctx->GetDrawTarget()->GetTransform() *
Matrix::Translation(-tmpDTRect.TopLeft()));
ctx = gfxContext::CreatePreservingTransformOrNull(tempDT);
if (!ctx) {
gfxDevCrash(LogReason::InvalidContext)
<< "ImageRenderer::Draw problem " << gfx::hexa(tempDT);
return ImgDrawResult::TEMPORARY_ERROR;
}
}
switch (mType) {
case eStyleImageType_Image: {
result = nsLayoutUtils::DrawBackgroundImage(
*ctx, mForFrame, aPresContext, mImageContainer, samplingFilter, aDest,
aFill, aRepeatSize, aAnchor, aDirtyRect,
ConvertImageRendererToDrawFlags(mFlags), mExtendMode, aOpacity);
break;
}
case eStyleImageType_Gradient: {
nsCSSGradientRenderer renderer = nsCSSGradientRenderer::Create(
aPresContext, mForFrame->Style(), *mGradientData, mSize);
renderer.Paint(*ctx, aDest, aFill, aRepeatSize, aSrc, aDirtyRect,
aOpacity);
break;
}
case eStyleImageType_Element: {
RefPtr<gfxDrawable> drawable = DrawableForElement(aDest, *ctx);
if (!drawable) {
NS_WARNING("Could not create drawable for element");
return ImgDrawResult::TEMPORARY_ERROR;
}
nsCOMPtr<imgIContainer> image(ImageOps::CreateFromDrawable(drawable));
result = nsLayoutUtils::DrawImage(
*ctx, mForFrame->Style(), aPresContext, image, samplingFilter, aDest,
aFill, aAnchor, aDirtyRect, ConvertImageRendererToDrawFlags(mFlags),
aOpacity);
break;
}
case eStyleImageType_Null:
default:
break;
}
if (!tmpDTRect.IsEmpty()) {
DrawTarget* dt = aRenderingContext.GetDrawTarget();
Matrix oldTransform = dt->GetTransform();
dt->SetTransform(Matrix());
if (mMaskOp == StyleMaskMode::Luminance) {
RefPtr<SourceSurface> surf = ctx->GetDrawTarget()->IntoLuminanceSource(
LuminanceType::LUMINANCE, 1.0f);
dt->MaskSurface(ColorPattern(Color(0, 0, 0, 1.0f)), surf,
tmpDTRect.TopLeft(),
DrawOptions(1.0f, aRenderingContext.CurrentOp()));
} else {
RefPtr<SourceSurface> surf = ctx->GetDrawTarget()->Snapshot();
dt->DrawSurface(
surf,
Rect(tmpDTRect.x, tmpDTRect.y, tmpDTRect.width, tmpDTRect.height),
Rect(0, 0, tmpDTRect.width, tmpDTRect.height),
DrawSurfaceOptions(SamplingFilter::POINT),
DrawOptions(1.0f, aRenderingContext.CurrentOp()));
}
dt->SetTransform(oldTransform);
}
if (!mImage->IsComplete()) {
result &= ImgDrawResult::SUCCESS_NOT_COMPLETE;
}
return result;
}
ImgDrawResult nsImageRenderer::BuildWebRenderDisplayItems(
nsPresContext* aPresContext, mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const mozilla::layers::StackingContextHelper& aSc,
mozilla::layers::RenderRootStateManager* aManager, nsDisplayItem* aItem,
const nsRect& aDirtyRect, const nsRect& aDest, const nsRect& aFill,
const nsPoint& aAnchor, const nsSize& aRepeatSize, const CSSIntRect& aSrc,
float aOpacity) {
if (!IsReady()) {
MOZ_ASSERT_UNREACHABLE(
"Ensure PrepareImage() has returned true before "
"calling me");
return ImgDrawResult::NOT_READY;
}
if (aDest.IsEmpty() || aFill.IsEmpty() || mSize.width <= 0 ||
mSize.height <= 0) {
return ImgDrawResult::SUCCESS;
}
ImgDrawResult drawResult = ImgDrawResult::SUCCESS;
switch (mType) {
case eStyleImageType_Gradient: {
nsCSSGradientRenderer renderer = nsCSSGradientRenderer::Create(
aPresContext, mForFrame->Style(), *mGradientData, mSize);
renderer.BuildWebRenderDisplayItems(aBuilder, aSc, aDest, aFill,
aRepeatSize, aSrc,
!aItem->BackfaceIsHidden(), aOpacity);
break;
}
case eStyleImageType_Image: {
uint32_t containerFlags = imgIContainer::FLAG_ASYNC_NOTIFY;
if (mFlags & nsImageRenderer::FLAG_PAINTING_TO_WINDOW) {
containerFlags |= imgIContainer::FLAG_HIGH_QUALITY_SCALING;
}
if (mFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES) {
containerFlags |= imgIContainer::FLAG_SYNC_DECODE;
}
CSSIntSize destCSSSize{
nsPresContext::AppUnitsToIntCSSPixels(aDest.width),
nsPresContext::AppUnitsToIntCSSPixels(aDest.height)};
Maybe<SVGImageContext> svgContext(
Some(SVGImageContext(Some(destCSSSize))));
const int32_t appUnitsPerDevPixel =
mForFrame->PresContext()->AppUnitsPerDevPixel();
LayoutDeviceRect destRect =
LayoutDeviceRect::FromAppUnits(aDest, appUnitsPerDevPixel);
auto stretchSize = wr::ToLayoutSize(destRect.Size());
gfx::IntSize decodeSize =
nsLayoutUtils::ComputeImageContainerDrawingParameters(
mImageContainer, mForFrame, destRect, aSc, containerFlags,
svgContext);
RefPtr<layers::ImageContainer> container;
drawResult = mImageContainer->GetImageContainerAtSize(
aManager->LayerManager(), decodeSize, svgContext, containerFlags,
getter_AddRefs(container));
if (!container) {
NS_WARNING("Failed to get image container");
break;
}
mozilla::wr::ImageRendering rendering = wr::ToImageRendering(
nsLayoutUtils::GetSamplingFilterForFrame(aItem->Frame()));
gfx::IntSize size;
Maybe<wr::ImageKey> key = aManager->CommandBuilder().CreateImageKey(
aItem, container, aBuilder, aResources, rendering, aSc, size,
Nothing());
if (key.isNothing()) {
break;
}
wr::LayoutRect dest = wr::ToLayoutRect(destRect);
wr::LayoutRect clip = wr::ToLayoutRect(
LayoutDeviceRect::FromAppUnits(aFill, appUnitsPerDevPixel));
if (mExtendMode == ExtendMode::CLAMP) {
// The image is not repeating. Just push as a regular image.
aBuilder.PushImage(dest, clip, !aItem->BackfaceIsHidden(), rendering,
key.value());
} else {
nsPoint firstTilePos = nsLayoutUtils::GetBackgroundFirstTilePos(
aDest.TopLeft(), aFill.TopLeft(), aRepeatSize);
LayoutDeviceRect fillRect = LayoutDeviceRect::FromAppUnits(
nsRect(firstTilePos.x, firstTilePos.y,
aFill.XMost() - firstTilePos.x,
aFill.YMost() - firstTilePos.y),
appUnitsPerDevPixel);
wr::LayoutRect fill = wr::ToLayoutRect(fillRect);
switch (mExtendMode) {
case ExtendMode::REPEAT_Y:
fill.origin.x = dest.origin.x;
fill.size.width = dest.size.width;
stretchSize.width = dest.size.width;
break;
case ExtendMode::REPEAT_X:
fill.origin.y = dest.origin.y;
fill.size.height = dest.size.height;
stretchSize.height = dest.size.height;
break;
default:
break;
}
LayoutDeviceSize gapSize = LayoutDeviceSize::FromAppUnits(
aRepeatSize - aDest.Size(), appUnitsPerDevPixel);
aBuilder.PushRepeatingImage(fill, clip, !aItem->BackfaceIsHidden(),
stretchSize, wr::ToLayoutSize(gapSize),
rendering, key.value());
}
break;
}
default:
break;
}
if (!mImage->IsComplete() && drawResult == ImgDrawResult::SUCCESS) {
return ImgDrawResult::SUCCESS_NOT_COMPLETE;
}
return drawResult;
}
already_AddRefed<gfxDrawable> nsImageRenderer::DrawableForElement(
const nsRect& aImageRect, gfxContext& aContext) {
NS_ASSERTION(mType == eStyleImageType_Element,
"DrawableForElement only makes sense if backed by an element");
if (mPaintServerFrame) {
// XXX(seth): In order to not pass FLAG_SYNC_DECODE_IMAGES here,
// DrawableFromPaintServer would have to return a ImgDrawResult indicating
// whether any images could not be painted because they weren't fully
// decoded. Even always passing FLAG_SYNC_DECODE_IMAGES won't eliminate all
// problems, as it won't help if there are image which haven't finished
// loading, but it's better than nothing.
int32_t appUnitsPerDevPixel =
mForFrame->PresContext()->AppUnitsPerDevPixel();
nsRect destRect = aImageRect - aImageRect.TopLeft();
nsIntSize roundedOut = destRect.ToOutsidePixels(appUnitsPerDevPixel).Size();
IntSize imageSize(roundedOut.width, roundedOut.height);
RefPtr<gfxDrawable> drawable;
SurfaceFormat format = aContext.GetDrawTarget()->GetFormat();
// Don't allow creating images that are too big
if (aContext.GetDrawTarget()->CanCreateSimilarDrawTarget(imageSize,
format)) {
drawable = nsSVGIntegrationUtils::DrawableFromPaintServer(
mPaintServerFrame, mForFrame, mSize, imageSize,
aContext.GetDrawTarget(), aContext.CurrentMatrixDouble(),
nsSVGIntegrationUtils::FLAG_SYNC_DECODE_IMAGES);
}
return drawable.forget();
}
NS_ASSERTION(mImageElementSurface.GetSourceSurface(),
"Surface should be ready.");
RefPtr<gfxDrawable> drawable =
new gfxSurfaceDrawable(mImageElementSurface.GetSourceSurface().get(),
mImageElementSurface.mSize);
return drawable.forget();
}
ImgDrawResult nsImageRenderer::DrawLayer(
nsPresContext* aPresContext, gfxContext& aRenderingContext,
const nsRect& aDest, const nsRect& aFill, const nsPoint& aAnchor,
const nsRect& aDirty, const nsSize& aRepeatSize, float aOpacity) {
if (!IsReady()) {
MOZ_ASSERT_UNREACHABLE(
"Ensure PrepareImage() has returned true before "
"calling me");
return ImgDrawResult::TEMPORARY_ERROR;
}
if (aDest.IsEmpty() || aFill.IsEmpty() || mSize.width <= 0 ||
mSize.height <= 0) {
return ImgDrawResult::SUCCESS;
}
return Draw(
aPresContext, aRenderingContext, aDirty, aDest, aFill, aAnchor,
aRepeatSize,
CSSIntRect(0, 0, nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
nsPresContext::AppUnitsToIntCSSPixels(mSize.height)),
aOpacity);
}
ImgDrawResult nsImageRenderer::BuildWebRenderDisplayItemsForLayer(
nsPresContext* aPresContext, mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const mozilla::layers::StackingContextHelper& aSc,
mozilla::layers::RenderRootStateManager* aManager, nsDisplayItem* aItem,
const nsRect& aDest, const nsRect& aFill, const nsPoint& aAnchor,
const nsRect& aDirty, const nsSize& aRepeatSize, float aOpacity) {
if (!IsReady()) {
MOZ_ASSERT_UNREACHABLE(
"Ensure PrepareImage() has returned true before "
"calling me");
return mPrepareResult;
}
if (aDest.IsEmpty() || aFill.IsEmpty() || mSize.width <= 0 ||
mSize.height <= 0) {
return ImgDrawResult::SUCCESS;
}
return BuildWebRenderDisplayItems(
aPresContext, aBuilder, aResources, aSc, aManager, aItem, aDirty, aDest,
aFill, aAnchor, aRepeatSize,
CSSIntRect(0, 0, nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
nsPresContext::AppUnitsToIntCSSPixels(mSize.height)),
aOpacity);
}
/**
* Compute the size and position of the master copy of the image. I.e., a single
* tile used to fill the dest rect.
* aFill The destination rect to be filled
* aHFill and aVFill are the repeat patterns for the component -
* StyleBorderImageRepeat - i.e., how a tiling unit is used to fill aFill
* aUnitSize The size of the source rect in dest coords.
*/
static nsRect ComputeTile(nsRect& aFill, StyleBorderImageRepeat aHFill,
StyleBorderImageRepeat aVFill,
const nsSize& aUnitSize, nsSize& aRepeatSize) {
nsRect tile;
switch (aHFill) {
case StyleBorderImageRepeat::Stretch:
tile.x = aFill.x;
tile.width = aFill.width;
aRepeatSize.width = tile.width;
break;
case StyleBorderImageRepeat::Repeat:
tile.x = aFill.x + aFill.width / 2 - aUnitSize.width / 2;
tile.width = aUnitSize.width;
aRepeatSize.width = tile.width;
break;
case StyleBorderImageRepeat::Round:
tile.x = aFill.x;
tile.width =
nsCSSRendering::ComputeRoundedSize(aUnitSize.width, aFill.width);
aRepeatSize.width = tile.width;
break;
case StyleBorderImageRepeat::Space: {
nscoord space;
aRepeatSize.width = nsCSSRendering::ComputeBorderSpacedRepeatSize(
aUnitSize.width, aFill.width, space);
tile.x = aFill.x + space;
tile.width = aUnitSize.width;
aFill.x = tile.x;
aFill.width = aFill.width - space * 2;
} break;
default:
MOZ_ASSERT_UNREACHABLE("unrecognized border-image fill style");
}
switch (aVFill) {
case StyleBorderImageRepeat::Stretch:
tile.y = aFill.y;
tile.height = aFill.height;
aRepeatSize.height = tile.height;
break;
case StyleBorderImageRepeat::Repeat:
tile.y = aFill.y + aFill.height / 2 - aUnitSize.height / 2;
tile.height = aUnitSize.height;
aRepeatSize.height = tile.height;
break;
case StyleBorderImageRepeat::Round:
tile.y = aFill.y;
tile.height =
nsCSSRendering::ComputeRoundedSize(aUnitSize.height, aFill.height);
aRepeatSize.height = tile.height;
break;
case StyleBorderImageRepeat::Space: {
nscoord space;
aRepeatSize.height = nsCSSRendering::ComputeBorderSpacedRepeatSize(
aUnitSize.height, aFill.height, space);
tile.y = aFill.y + space;
tile.height = aUnitSize.height;
aFill.y = tile.y;
aFill.height = aFill.height - space * 2;
} break;
default:
MOZ_ASSERT_UNREACHABLE("unrecognized border-image fill style");
}
return tile;
}
/**
* Returns true if the given set of arguments will require the tiles which fill
* the dest rect to be scaled from the source tile. See comment on ComputeTile
* for argument descriptions.
*/
static bool RequiresScaling(const nsRect& aFill, StyleBorderImageRepeat aHFill,
StyleBorderImageRepeat aVFill,
const nsSize& aUnitSize) {
// If we have no tiling in either direction, we can skip the intermediate
// scaling step.
return (aHFill != StyleBorderImageRepeat::Stretch ||
aVFill != StyleBorderImageRepeat::Stretch) &&
(aUnitSize.width != aFill.width || aUnitSize.height != aFill.height);
}
ImgDrawResult nsImageRenderer::DrawBorderImageComponent(
nsPresContext* aPresContext, gfxContext& aRenderingContext,
const nsRect& aDirtyRect, const nsRect& aFill, const CSSIntRect& aSrc,
StyleBorderImageRepeat aHFill, StyleBorderImageRepeat aVFill,
const nsSize& aUnitSize, uint8_t aIndex,
const Maybe<nsSize>& aSVGViewportSize, const bool aHasIntrinsicRatio) {
if (!IsReady()) {
MOZ_ASSERT_UNREACHABLE(
"Ensure PrepareImage() has returned true before "
"calling me");
return ImgDrawResult::BAD_ARGS;
}
if (aFill.IsEmpty() || aSrc.IsEmpty()) {
return ImgDrawResult::SUCCESS;
}
if (mType == eStyleImageType_Image || mType == eStyleImageType_Element) {
nsCOMPtr<imgIContainer> subImage;
// To draw one portion of an image into a border component, we stretch that
// portion to match the size of that border component and then draw onto.
// However, preserveAspectRatio attribute of a SVG image may break this
// rule. To get correct rendering result, we add
// FLAG_FORCE_PRESERVEASPECTRATIO_NONE flag here, to tell mImage to ignore
// preserveAspectRatio attribute, and always do non-uniform stretch.
uint32_t drawFlags = ConvertImageRendererToDrawFlags(mFlags) |
imgIContainer::FLAG_FORCE_PRESERVEASPECTRATIO_NONE;
// For those SVG image sources which don't have fixed aspect ratio (i.e.
// without viewport size and viewBox), we should scale the source uniformly
// after the viewport size is decided by "Default Sizing Algorithm".
if (!aHasIntrinsicRatio) {
drawFlags = drawFlags | imgIContainer::FLAG_FORCE_UNIFORM_SCALING;
}
// Retrieve or create the subimage we'll draw.
nsIntRect srcRect(aSrc.x, aSrc.y, aSrc.width, aSrc.height);
if (mType == eStyleImageType_Image) {
if ((subImage = mImage->GetSubImage(aIndex)) == nullptr) {
subImage = ImageOps::Clip(mImageContainer, srcRect, aSVGViewportSize);
mImage->SetSubImage(aIndex, subImage);
}
} else {
// This path, for eStyleImageType_Element, is currently slower than it
// needs to be because we don't cache anything. (In particular, if we have
// to draw to a temporary surface inside ClippedImage, we don't cache that
// temporary surface since we immediately throw the ClippedImage we create
// here away.) However, if we did cache, we'd need to know when to
// invalidate that cache, and it's not clear that it's worth the trouble
// since using border-image with -moz-element is rare.
RefPtr<gfxDrawable> drawable =
DrawableForElement(nsRect(nsPoint(), mSize), aRenderingContext);
if (!drawable) {
NS_WARNING("Could not create drawable for element");
return ImgDrawResult::TEMPORARY_ERROR;
}
nsCOMPtr<imgIContainer> image(ImageOps::CreateFromDrawable(drawable));
subImage = ImageOps::Clip(image, srcRect, aSVGViewportSize);
}
MOZ_ASSERT(!aSVGViewportSize ||
subImage->GetType() == imgIContainer::TYPE_VECTOR);
SamplingFilter samplingFilter =
nsLayoutUtils::GetSamplingFilterForFrame(mForFrame);
if (!RequiresScaling(aFill, aHFill, aVFill, aUnitSize)) {
ImgDrawResult result = nsLayoutUtils::DrawSingleImage(
aRenderingContext, aPresContext, subImage, samplingFilter, aFill,
aDirtyRect,
/* no SVGImageContext */ Nothing(), drawFlags);
if (!mImage->IsComplete()) {
result &= ImgDrawResult::SUCCESS_NOT_COMPLETE;
}
return result;
}
nsSize repeatSize;
nsRect fillRect(aFill);
nsRect tile = ComputeTile(fillRect, aHFill, aVFill, aUnitSize, repeatSize);
ImgDrawResult result = nsLayoutUtils::DrawBackgroundImage(
aRenderingContext, mForFrame, aPresContext, subImage, samplingFilter,
tile, fillRect, repeatSize, tile.TopLeft(), aDirtyRect, drawFlags,
ExtendMode::CLAMP, 1.0);
if (!mImage->IsComplete()) {
result &= ImgDrawResult::SUCCESS_NOT_COMPLETE;
}
return result;
}
nsSize repeatSize(aFill.Size());
nsRect fillRect(aFill);
nsRect destTile =
RequiresScaling(fillRect, aHFill, aVFill, aUnitSize)
? ComputeTile(fillRect, aHFill, aVFill, aUnitSize, repeatSize)
: fillRect;
return Draw(aPresContext, aRenderingContext, aDirtyRect, destTile, fillRect,
destTile.TopLeft(), repeatSize, aSrc);
}
ImgDrawResult nsImageRenderer::DrawShapeImage(nsPresContext* aPresContext,
gfxContext& aRenderingContext) {
if (!IsReady()) {
MOZ_ASSERT_UNREACHABLE(
"Ensure PrepareImage() has returned true before "
"calling me");
return ImgDrawResult::NOT_READY;
}
if (mSize.width <= 0 || mSize.height <= 0) {
return ImgDrawResult::SUCCESS;
}
ImgDrawResult result = ImgDrawResult::SUCCESS;
switch (mType) {
case eStyleImageType_Image: {
uint32_t drawFlags =
ConvertImageRendererToDrawFlags(mFlags) | imgIContainer::FRAME_FIRST;
nsRect dest(nsPoint(0, 0), mSize);
// We have a tricky situation in our choice of SamplingFilter. Shape
// images define a float area based on the alpha values in the rendered
// pixels. When multiple device pixels are used for one css pixel, the
// sampling can change crisp edges into aliased edges. For visual pixels,
// that's usually the right choice. For defining a float area, it can
// cause problems. If a style is using a shape-image-threshold value that
// is less than the alpha of the edge pixels, any filtering may smear the
// alpha into adjacent pixels and expand the float area in a confusing
// way. Since the alpha threshold can be set precisely in CSS, and since a
// web author may be counting on that threshold to define a precise float
// area from an image, it is least confusing to have the rendered pixels
// have unfiltered alpha. We use SamplingFilter::POINT to ensure that each
// rendered pixel has an alpha that precisely matches the alpha of the
// closest pixel in the image.
result = nsLayoutUtils::DrawSingleImage(
aRenderingContext, aPresContext, mImageContainer,
SamplingFilter::POINT, dest, dest, Nothing(), drawFlags, nullptr,
nullptr);
break;
}
case eStyleImageType_Gradient: {
nsCSSGradientRenderer renderer = nsCSSGradientRenderer::Create(
aPresContext, mForFrame->Style(), *mGradientData, mSize);
nsRect dest(nsPoint(0, 0), mSize);
renderer.Paint(aRenderingContext, dest, dest, mSize,
CSSIntRect::FromAppUnitsRounded(dest), dest, 1.0);
break;
}
default:
// Unsupported image type.
result = ImgDrawResult::BAD_IMAGE;
break;
}
return result;
}
bool nsImageRenderer::IsRasterImage() {
if (mType != eStyleImageType_Image || !mImageContainer) return false;
return mImageContainer->GetType() == imgIContainer::TYPE_RASTER;
}
bool nsImageRenderer::IsAnimatedImage() {
if (mType != eStyleImageType_Image || !mImageContainer) return false;
bool animated = false;
if (NS_SUCCEEDED(mImageContainer->GetAnimated(&animated)) && animated)
return true;
return false;
}
already_AddRefed<imgIContainer> nsImageRenderer::GetImage() {
if (mType != eStyleImageType_Image || !mImageContainer) {
return nullptr;
}
nsCOMPtr<imgIContainer> image = mImageContainer;
return image.forget();
}
bool nsImageRenderer::IsImageContainerAvailable(layers::LayerManager* aManager,
uint32_t aFlags) {
if (!mImageContainer) {
return false;
}
return mImageContainer->IsImageContainerAvailable(aManager, aFlags);
}
void nsImageRenderer::PurgeCacheForViewportChange(
const Maybe<nsSize>& aSVGViewportSize, const bool aHasIntrinsicRatio) {
// Check if we should flush the cached data - only vector images need to do
// the check since they might not have fixed ratio.
if (mImageContainer &&
mImageContainer->GetType() == imgIContainer::TYPE_VECTOR) {
mImage->PurgeCacheForViewportChange(aSVGViewportSize, aHasIntrinsicRatio);
}
}
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