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gecko-dev/layout/painting/nsImageRenderer.cpp
Kartikaya Gupta 00ef028ed3 Bug 1416267 - Update gfxContext matrix functions to avoid flip-flopping between float and double matrices. r=jrmuizel 
The core of this change is in gfxContext.*:
- change gfxContext::CurrentMatrix() and gfxContext::SetMatrix() to
  return and take a Matrix respectively, instead of converting to
  and from a gfxMatrix (which uses doubles). These functions therefore
  will now match the native representation of the transform in gfxContext.
- add two new functions CurrentMatrixDouble() and SetMatrixDouble() that
  do what the old CurrentMatrix() and SetMatrix() used to do, i.e.
  convert between the float matrix and the double matrix.

The rest of the change is just updating the call sites to avoid round-
tripping between floats and doubles where possible. Call sites that are
hard to fix are migrated to the new XXXDouble functions which preserves
the existing behaviour.

MozReview-Commit-ID: 5sbBpLUus3U
2017-11-10 21:14:09 -05:00

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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 functions for drawing borders and backgrounds */
#include "nsImageRenderer.h"
#include "mozilla/webrender/WebRenderAPI.h"
#include "gfxContext.h"
#include "gfxDrawable.h"
#include "ImageOps.h"
#include "mozilla/layers/StackingContextHelper.h"
#include "mozilla/layers/WebRenderLayerManager.h"
#include "nsContentUtils.h"
#include "nsCSSRendering.h"
#include "nsCSSRenderingGradients.h"
#include "nsIFrame.h"
#include "nsStyleStructInlines.h"
#include "nsSVGDisplayableFrame.h"
#include "SVGObserverUtils.h"
#include "nsSVGIntegrationUtils.h"
#include "mozilla/layers/WebRenderLayerManager.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) {
nscoord height = NSCoordSaturatingNonnegativeMultiply(
mWidth,
double(mRatio.height) / mRatio.width);
return nsSize(mWidth, height);
}
MOZ_ASSERT(mHasHeight);
nscoord width = NSCoordSaturatingNonnegativeMultiply(
mHeight,
double(mRatio.width) / mRatio.height);
return nsSize(width, 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(DrawResult::NOT_READY)
, mSize(0, 0)
, mFlags(aFlags)
, mExtendMode(ExtendMode::CLAMP)
, mMaskOp(NS_STYLE_MASK_MODE_MATCH_SOURCE)
{
}
nsImageRenderer::~nsImageRenderer()
{
}
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()) {
mPrepareResult = DrawResult::BAD_IMAGE;
return false;
}
if (!mImage->IsComplete()) {
// Make sure the image is actually decoding.
bool frameComplete = mImage->StartDecoding();
// 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 = DrawResult::NOT_READY;
return false;
}
}
switch (mType) {
case eStyleImageType_Image: {
MOZ_ASSERT(mImage->GetImageData(),
"must have image data, since we checked IsEmpty 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 = DrawResult::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 = DrawResult::SUCCESS;
break;
}
case eStyleImageType_Gradient:
mGradientData = mImage->GetGradientData();
mPrepareResult = DrawResult::SUCCESS;
break;
case eStyleImageType_Element:
{
nsAutoString elementId =
NS_LITERAL_STRING("#") + nsDependentAtomString(mImage->GetElementId());
nsCOMPtr<nsIURI> targetURI;
nsCOMPtr<nsIURI> base = mForFrame->GetContent()->GetBaseURI();
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI), elementId,
mForFrame->GetContent()->GetUncomposedDoc(), base);
nsSVGPaintingProperty* property = SVGObserverUtils::GetPaintingPropertyForURI(
targetURI, mForFrame->FirstContinuation(),
SVGObserverUtils::BackgroundImageProperty());
if (!property) {
mPrepareResult = DrawResult::BAD_IMAGE;
return false;
}
// If the referenced element is an <img>, <canvas>, or <video> element,
// prefer SurfaceFromElement as it's more reliable.
mImageElementSurface =
nsLayoutUtils::SurfaceFromElement(property->GetReferencedElement());
if (!mImageElementSurface.GetSourceSurface()) {
nsIFrame* paintServerFrame = property->GetReferencedFrame();
// 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 = DrawResult::BAD_IMAGE;
return false;
}
mPaintServerFrame = paintServerFrame;
}
mPrepareResult = DrawResult::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.width != 0) {
nscoord intrinsicHeight =
NSCoordSaturatingNonnegativeMultiply(imageIntSize.width,
float(result.mRatio.height) /
float(result.mRatio.width));
result.SetHeight(nsPresContext::CSSPixelsToAppUnits(intrinsicHeight));
} else if (haveHeight && !haveWidth && result.mRatio.height != 0) {
nscoord intrinsicWidth =
NSCoordSaturatingNonnegativeMultiply(imageIntSize.height,
float(result.mRatio.width) /
float(result.mRatio.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 = NSCoordSaturatingNonnegativeMultiply(
aSpecifiedSize.mWidth,
double(aIntrinsicSize.mRatio.height) / aIntrinsicSize.mRatio.width);
} 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 = NSCoordSaturatingNonnegativeMultiply(
aSpecifiedSize.mHeight,
double(aIntrinsicSize.mRatio.width) / aIntrinsicSize.mRatio.height);
} else if (aIntrinsicSize.mHasWidth) {
width = aIntrinsicSize.mWidth;
} else {
width = aDefaultSize.width;
}
return nsSize(width, aSpecifiedSize.mHeight);
}
/* static */ nsSize
nsImageRenderer::ComputeConstrainedSize(const nsSize& aConstrainingSize,
const nsSize& aIntrinsicRatio,
FitType aFitType)
{
if (aIntrinsicRatio.width <= 0 && aIntrinsicRatio.height <= 0) {
return aConstrainingSize;
}
float scaleX = double(aConstrainingSize.width) / aIntrinsicRatio.width;
float scaleY = double(aConstrainingSize.height) / aIntrinsicRatio.height;
nsSize size;
if ((aFitType == CONTAIN) == (scaleX < scaleY)) {
size.width = aConstrainingSize.width;
size.height = NSCoordSaturatingNonnegativeMultiply(
aIntrinsicRatio.height, scaleX);
// 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 < nsPresContext::AppUnitsPerCSSPixel()) {
size.height = aConstrainingSize.height;
}
} else {
size.width = NSCoordSaturatingNonnegativeMultiply(
aIntrinsicRatio.width, scaleY);
if (aFitType == CONTAIN && aConstrainingSize.width - size.width < nsPresContext::AppUnitsPerCSSPixel()) {
size.width = aConstrainingSize.width;
}
size.height = aConstrainingSize.height;
}
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;
}
/*
* SVG11: A luminanceToAlpha operation is equivalent to the following matrix operation: |
* | R' | | 0 0 0 0 0 | | R |
* | G' | | 0 0 0 0 0 | | G |
* | B' | = | 0 0 0 0 0 | * | B |
* | A' | | 0.2125 0.7154 0.0721 0 0 | | A |
* | 1 | | 0 0 0 0 1 | | 1 |
*/
static void
RGBALuminanceOperation(uint8_t *aData,
int32_t aStride,
const IntSize &aSize)
{
int32_t redFactor = 55; // 256 * 0.2125
int32_t greenFactor = 183; // 256 * 0.7154
int32_t blueFactor = 18; // 256 * 0.0721
for (int32_t y = 0; y < aSize.height; y++) {
uint32_t *pixel = (uint32_t*)(aData + aStride * y);
for (int32_t x = 0; x < aSize.width; x++) {
*pixel = (((((*pixel & 0x00FF0000) >> 16) * redFactor) +
(((*pixel & 0x0000FF00) >> 8) * greenFactor) +
((*pixel & 0x000000FF) * blueFactor)) >> 8) << 24;
pixel++;
}
}
}
DrawResult
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()) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return DrawResult::TEMPORARY_ERROR;
}
if (aDest.IsEmpty() || aFill.IsEmpty() ||
mSize.width <= 0 || mSize.height <= 0) {
return DrawResult::SUCCESS;
}
SamplingFilter samplingFilter = nsLayoutUtils::GetSamplingFilterForFrame(mForFrame);
DrawResult result = DrawResult::SUCCESS;
RefPtr<gfxContext> ctx = &aRenderingContext;
IntRect tmpDTRect;
if (ctx->CurrentOp() != CompositionOp::OP_OVER || mMaskOp == NS_STYLE_MASK_MODE_LUMINANCE) {
gfxRect clipRect = ctx->GetClipExtents(gfxContext::eDeviceSpace);
tmpDTRect = RoundedOut(ToRect(clipRect));
if (tmpDTRect.IsEmpty()) {
return DrawResult::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 DrawResult::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 DrawResult::TEMPORARY_ERROR;
}
}
switch (mType) {
case eStyleImageType_Image:
{
CSSIntSize imageSize(nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
nsPresContext::AppUnitsToIntCSSPixels(mSize.height));
result =
nsLayoutUtils::DrawBackgroundImage(*ctx, mForFrame,
aPresContext,
mImageContainer, imageSize,
samplingFilter,
aDest, aFill, aRepeatSize,
aAnchor, aDirtyRect,
ConvertImageRendererToDrawFlags(mFlags),
mExtendMode, aOpacity);
break;
}
case eStyleImageType_Gradient:
{
nsCSSGradientRenderer renderer =
nsCSSGradientRenderer::Create(aPresContext, 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 DrawResult::TEMPORARY_ERROR;
}
nsCOMPtr<imgIContainer> image(ImageOps::CreateFromDrawable(drawable));
result =
nsLayoutUtils::DrawImage(*ctx, mForFrame->StyleContext(),
aPresContext, image,
samplingFilter, aDest, aFill, aAnchor, aDirtyRect,
ConvertImageRendererToDrawFlags(mFlags),
aOpacity);
break;
}
case eStyleImageType_Null:
default:
break;
}
if (!tmpDTRect.IsEmpty()) {
RefPtr<SourceSurface> surf = ctx->GetDrawTarget()->Snapshot();
if (mMaskOp == NS_STYLE_MASK_MODE_LUMINANCE) {
RefPtr<DataSourceSurface> maskData = surf->GetDataSurface();
DataSourceSurface::MappedSurface map;
if (!maskData->Map(DataSourceSurface::MapType::READ_WRITE, &map)) {
return result;
}
RGBALuminanceOperation(map.mData, map.mStride, maskData->GetSize());
maskData->Unmap();
surf = maskData;
}
DrawTarget* dt = aRenderingContext.GetDrawTarget();
Matrix oldTransform = dt->GetTransform();
dt->SetTransform(Matrix());
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);
}
return result;
}
DrawResult
nsImageRenderer::BuildWebRenderDisplayItems(nsPresContext* aPresContext,
mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const mozilla::layers::StackingContextHelper& aSc,
mozilla::layers::WebRenderLayerManager* 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()) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return DrawResult::NOT_READY;
}
if (aDest.IsEmpty() || aFill.IsEmpty() ||
mSize.width <= 0 || mSize.height <= 0) {
return DrawResult::SUCCESS;
}
switch (mType) {
case eStyleImageType_Gradient:
{
nsCSSGradientRenderer renderer =
nsCSSGradientRenderer::Create(aPresContext, mGradientData, mSize);
renderer.BuildWebRenderDisplayItems(aBuilder, aSc, aDest, aFill,
aRepeatSize, aSrc, !aItem->BackfaceIsHidden(), aOpacity);
break;
}
case eStyleImageType_Image:
{
// XXX(aosmond): We will support downscale-on-decode in bug 1368776. Until
// then, don't pass FLAG_HIGH_QUALITY_SCALING.
uint32_t containerFlags = imgIContainer::FLAG_NONE;
if (mFlags & nsImageRenderer::FLAG_SYNC_DECODE_IMAGES) {
containerFlags |= imgIContainer::FLAG_SYNC_DECODE;
}
RefPtr<layers::ImageContainer> container =
mImageContainer->GetImageContainer(aManager, containerFlags);
if (!container) {
NS_WARNING("Failed to get image container");
return DrawResult::NOT_READY;
}
gfx::IntSize size;
Maybe<wr::ImageKey> key = aManager->CommandBuilder().CreateImageKey(aItem, container, aBuilder,
aResources, aSc, size, Nothing());
if (key.isNothing()) {
return DrawResult::BAD_IMAGE;
}
const int32_t appUnitsPerDevPixel = mForFrame->PresContext()->AppUnitsPerDevPixel();
LayoutDeviceRect destRect = LayoutDeviceRect::FromAppUnits(
aDest, appUnitsPerDevPixel);
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 = aSc.ToRelativeLayoutRect(fillRect);
wr::LayoutRect clip = aSc.ToRelativeLayoutRect(
LayoutDeviceRect::FromAppUnits(aFill, appUnitsPerDevPixel));
LayoutDeviceSize gapSize = LayoutDeviceSize::FromAppUnits(
aRepeatSize - aDest.Size(), appUnitsPerDevPixel);
SamplingFilter samplingFilter = nsLayoutUtils::GetSamplingFilterForFrame(mForFrame);
aBuilder.PushImage(fill, clip, !aItem->BackfaceIsHidden(),
wr::ToLayoutSize(destRect.Size()), wr::ToLayoutSize(gapSize),
wr::ToImageRendering(samplingFilter), key.value());
break;
}
default:
break;
}
return DrawResult::SUCCESS;
}
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 DrawResult 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 =
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();
}
DrawResult
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()) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return DrawResult::TEMPORARY_ERROR;
}
if (aDest.IsEmpty() || aFill.IsEmpty() ||
mSize.width <= 0 || mSize.height <= 0) {
return DrawResult::SUCCESS;
}
return Draw(aPresContext, aRenderingContext,
aDirty, aDest, aFill, aAnchor, aRepeatSize,
CSSIntRect(0, 0,
nsPresContext::AppUnitsToIntCSSPixels(mSize.width),
nsPresContext::AppUnitsToIntCSSPixels(mSize.height)),
aOpacity);
}
DrawResult
nsImageRenderer::BuildWebRenderDisplayItemsForLayer(nsPresContext* aPresContext,
mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const mozilla::layers::StackingContextHelper& aSc,
mozilla::layers::WebRenderLayerManager* aManager,
nsDisplayItem* aItem,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
const nsSize& aRepeatSize,
float aOpacity)
{
if (!IsReady()) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return mPrepareResult;
}
if (aDest.IsEmpty() || aFill.IsEmpty() ||
mSize.width <= 0 || mSize.height <= 0) {
return DrawResult::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 -
* NS_STYLE_BORDER_IMAGE_REPEAT_* - 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,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize,
nsSize& aRepeatSize)
{
nsRect tile;
switch (aHFill) {
case NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH:
tile.x = aFill.x;
tile.width = aFill.width;
aRepeatSize.width = tile.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_REPEAT:
tile.x = aFill.x + aFill.width/2 - aUnitSize.width/2;
tile.width = aUnitSize.width;
aRepeatSize.width = tile.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_ROUND:
tile.x = aFill.x;
tile.width = nsCSSRendering::ComputeRoundedSize(aUnitSize.width,
aFill.width);
aRepeatSize.width = tile.width;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_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:
NS_NOTREACHED("unrecognized border-image fill style");
}
switch (aVFill) {
case NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH:
tile.y = aFill.y;
tile.height = aFill.height;
aRepeatSize.height = tile.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_REPEAT:
tile.y = aFill.y + aFill.height/2 - aUnitSize.height/2;
tile.height = aUnitSize.height;
aRepeatSize.height = tile.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_ROUND:
tile.y = aFill.y;
tile.height = nsCSSRendering::ComputeRoundedSize(aUnitSize.height,
aFill.height);
aRepeatSize.height = tile.height;
break;
case NS_STYLE_BORDER_IMAGE_REPEAT_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:
NS_NOTREACHED("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,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize)
{
// If we have no tiling in either direction, we can skip the intermediate
// scaling step.
return (aHFill != NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH ||
aVFill != NS_STYLE_BORDER_IMAGE_REPEAT_STRETCH) &&
(aUnitSize.width != aFill.width ||
aUnitSize.height != aFill.height);
}
DrawResult
nsImageRenderer::DrawBorderImageComponent(nsPresContext* aPresContext,
gfxContext& aRenderingContext,
const nsRect& aDirtyRect,
const nsRect& aFill,
const CSSIntRect& aSrc,
uint8_t aHFill,
uint8_t aVFill,
const nsSize& aUnitSize,
uint8_t aIndex,
const Maybe<nsSize>& aSVGViewportSize,
const bool aHasIntrinsicRatio)
{
if (!IsReady()) {
NS_NOTREACHED("Ensure PrepareImage() has returned true before calling me");
return DrawResult::BAD_ARGS;
}
if (aFill.IsEmpty() || aSrc.IsEmpty()) {
return DrawResult::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 DrawResult::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)) {
return nsLayoutUtils::DrawSingleImage(aRenderingContext,
aPresContext,
subImage,
samplingFilter,
aFill, aDirtyRect,
/* no SVGImageContext */ Nothing(),
drawFlags);
}
nsSize repeatSize;
nsRect fillRect(aFill);
nsRect tile = ComputeTile(fillRect, aHFill, aVFill, aUnitSize, repeatSize);
CSSIntSize imageSize(srcRect.width, srcRect.height);
return nsLayoutUtils::DrawBackgroundImage(aRenderingContext,
mForFrame, aPresContext,
subImage, imageSize, samplingFilter,
tile, fillRect, repeatSize,
tile.TopLeft(), aDirtyRect,
drawFlags,
ExtendMode::CLAMP, 1.0);
}
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);
}
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);
}
}
already_AddRefed<nsStyleGradient>
nsImageRenderer::GetGradientData()
{
RefPtr<nsStyleGradient> res = mGradientData;
return res.forget();
}
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