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fune/layout/svg/SVGIntegrationUtils.cpp
Emilio Cobos Álvarez 5730ee0ca5 Bug 1364813 - Remove IsFrameOfType, use non-virtual checks. r=jwatt 
Extend the per-frame-class bit we have to devirtualize IsLeaf to also
devirtualize IsFrameOfType. That is, move this data to FrameClasses.py.

This was done by going through all the frame classes, trying to preserve
behavior.

The only quirky thing is that I had to add two more trivial frame
classes, `nsAudioFrame` for audio elements, and
`nsFloatingFirstLetterFrame`. That's because these frame classes were
returning different answers at runtime, but they do this only on
conditions that trigger frame reconstruction (floating, and being an
audio element, respectively).

Differential Revision: https://phabricator.services.mozilla.com/D194703
2023-11-26 22:17:28 +00:00

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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/. */
// Main header first:
#include "SVGIntegrationUtils.h"
// Keep others in (case-insensitive) order:
#include "gfxDrawable.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSRendering.h"
#include "nsDisplayList.h"
#include "nsLayoutUtils.h"
#include "gfxContext.h"
#include "SVGPaintServerFrame.h"
#include "mozilla/gfx/Point.h"
#include "mozilla/CSSClipPathInstance.h"
#include "mozilla/FilterInstance.h"
#include "mozilla/StaticPrefs_layers.h"
#include "mozilla/SVGClipPathFrame.h"
#include "mozilla/SVGObserverUtils.h"
#include "mozilla/SVGMaskFrame.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/Unused.h"
#include "mozilla/dom/SVGElement.h"
using namespace mozilla::dom;
using namespace mozilla::layers;
using namespace mozilla::gfx;
using namespace mozilla::image;
namespace mozilla {
/**
* This class is used to get the pre-effects ink overflow rect of a frame,
* or, in the case of a frame with continuations, to collect the union of the
* pre-effects ink overflow rects of all the continuations. The result is
* relative to the origin (top left corner of the border box) of the frame, or,
* if the frame has continuations, the origin of the _first_ continuation.
*/
class PreEffectsInkOverflowCollector : public nsLayoutUtils::BoxCallback {
public:
/**
* If the pre-effects ink overflow rect of the frame being examined
* happens to be known, it can be passed in as aCurrentFrame and its
* pre-effects ink overflow rect can be passed in as
* aCurrentFrameOverflowArea. This is just an optimization to save a
* frame property lookup - these arguments are optional.
*/
PreEffectsInkOverflowCollector(nsIFrame* aFirstContinuation,
nsIFrame* aCurrentFrame,
const nsRect& aCurrentFrameOverflowArea,
bool aInReflow)
: mFirstContinuation(aFirstContinuation),
mCurrentFrame(aCurrentFrame),
mCurrentFrameOverflowArea(aCurrentFrameOverflowArea),
mInReflow(aInReflow) {
NS_ASSERTION(!mFirstContinuation->GetPrevContinuation(),
"We want the first continuation here");
}
void AddBox(nsIFrame* aFrame) override {
nsRect overflow = (aFrame == mCurrentFrame)
? mCurrentFrameOverflowArea
: PreEffectsInkOverflowRect(aFrame, mInReflow);
mResult.UnionRect(mResult,
overflow + aFrame->GetOffsetTo(mFirstContinuation));
}
nsRect GetResult() const { return mResult; }
private:
static nsRect PreEffectsInkOverflowRect(nsIFrame* aFrame, bool aInReflow) {
nsRect* r = aFrame->GetProperty(nsIFrame::PreEffectsBBoxProperty());
if (r) {
return *r;
}
#ifdef DEBUG
// Having PreTransformOverflowAreasProperty cached means
// InkOverflowRect() will return post-effect rect, which is not what
// we want. This function intentional reports pre-effect rect. But it does
// not matter if there is no SVG effect on this frame, since no effect
// means post-effect rect matches pre-effect rect.
//
// This function may be called during reflow or painting. We should only
// do this check in painting process since the PreEffectsBBoxProperty of
// continuations are not set correctly while reflowing.
if (SVGIntegrationUtils::UsingOverflowAffectingEffects(aFrame) &&
!aInReflow) {
OverflowAreas* preTransformOverflows =
aFrame->GetProperty(nsIFrame::PreTransformOverflowAreasProperty());
MOZ_ASSERT(!preTransformOverflows,
"InkOverflowRect() won't return the pre-effects rect!");
}
#endif
return aFrame->InkOverflowRectRelativeToSelf();
}
nsIFrame* mFirstContinuation;
nsIFrame* mCurrentFrame;
const nsRect& mCurrentFrameOverflowArea;
nsRect mResult;
bool mInReflow;
};
/**
* Gets the union of the pre-effects ink overflow rects of all of a frame's
* continuations, in "user space".
*/
static nsRect GetPreEffectsInkOverflowUnion(
nsIFrame* aFirstContinuation, nsIFrame* aCurrentFrame,
const nsRect& aCurrentFramePreEffectsOverflow,
const nsPoint& aFirstContinuationToUserSpace, bool aInReflow) {
NS_ASSERTION(!aFirstContinuation->GetPrevContinuation(),
"Need first continuation here");
PreEffectsInkOverflowCollector collector(aFirstContinuation, aCurrentFrame,
aCurrentFramePreEffectsOverflow,
aInReflow);
// Compute union of all overflow areas relative to aFirstContinuation:
nsLayoutUtils::GetAllInFlowBoxes(aFirstContinuation, &collector);
// Return the result in user space:
return collector.GetResult() + aFirstContinuationToUserSpace;
}
/**
* Gets the pre-effects ink overflow rect of aCurrentFrame in "user space".
*/
static nsRect GetPreEffectsInkOverflow(
nsIFrame* aFirstContinuation, nsIFrame* aCurrentFrame,
const nsPoint& aFirstContinuationToUserSpace) {
NS_ASSERTION(!aFirstContinuation->GetPrevContinuation(),
"Need first continuation here");
PreEffectsInkOverflowCollector collector(aFirstContinuation, nullptr,
nsRect(), false);
// Compute overflow areas of current frame relative to aFirstContinuation:
nsLayoutUtils::AddBoxesForFrame(aCurrentFrame, &collector);
// Return the result in user space:
return collector.GetResult() + aFirstContinuationToUserSpace;
}
bool SVGIntegrationUtils::UsingOverflowAffectingEffects(
const nsIFrame* aFrame) {
// Currently overflow don't take account of SVG or other non-absolute
// positioned clipping, or masking.
return aFrame->StyleEffects()->HasFilters();
}
bool SVGIntegrationUtils::UsingEffectsForFrame(const nsIFrame* aFrame) {
// Even when SVG display lists are disabled, returning true for SVG frames
// does not adversely affect any of our callers. Therefore we don't bother
// checking the SDL prefs here, since we don't know if we're being called for
// painting or hit-testing anyway.
const nsStyleSVGReset* style = aFrame->StyleSVGReset();
const nsStyleEffects* effects = aFrame->StyleEffects();
// TODO(cbrewster): remove backdrop-filter from this list once it is supported
// in preserve-3d cases.
return effects->HasFilters() || effects->HasBackdropFilters() ||
style->HasClipPath() || style->HasMask();
}
nsPoint SVGIntegrationUtils::GetOffsetToBoundingBox(nsIFrame* aFrame) {
if (aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
// Do NOT call GetAllInFlowRectsUnion for SVG - it will get the
// covered region relative to the SVGOuterSVGFrame, which is absolutely
// not what we want. SVG frames are always in user space, so they have
// no offset adjustment to make.
return nsPoint();
}
// The GetAllInFlowRectsUnion() call gets the union of the frame border-box
// rects over all continuations, relative to the origin (top-left of the
// border box) of its second argument (here, aFrame, the first continuation).
return -nsLayoutUtils::GetAllInFlowRectsUnion(aFrame, aFrame).TopLeft();
}
struct EffectOffsets {
// The offset between the reference frame and the bounding box of the
// target frame in app unit.
nsPoint offsetToBoundingBox;
// The offset between the reference frame and the bounding box of the
// target frame in app unit.
nsPoint offsetToUserSpace;
// The offset between the reference frame and the bounding box of the
// target frame in device unit.
gfxPoint offsetToUserSpaceInDevPx;
};
static EffectOffsets ComputeEffectOffset(
nsIFrame* aFrame, const SVGIntegrationUtils::PaintFramesParams& aParams) {
EffectOffsets result;
result.offsetToBoundingBox =
aParams.builder->ToReferenceFrame(aFrame) -
SVGIntegrationUtils::GetOffsetToBoundingBox(aFrame);
if (!aFrame->IsSVGFrame()) {
/* Snap the offset if the reference frame is not a SVG frame,
* since other frames will be snapped to pixel when rendering. */
result.offsetToBoundingBox =
nsPoint(aFrame->PresContext()->RoundAppUnitsToNearestDevPixels(
result.offsetToBoundingBox.x),
aFrame->PresContext()->RoundAppUnitsToNearestDevPixels(
result.offsetToBoundingBox.y));
}
// After applying only "aOffsetToBoundingBox", aParams.ctx would have its
// origin at the top left corner of frame's bounding box (over all
// continuations).
// However, SVG painting needs the origin to be located at the origin of the
// SVG frame's "user space", i.e. the space in which, for example, the
// frame's BBox lives.
// SVG geometry frames and foreignObject frames apply their own offsets, so
// their position is relative to their user space. So for these frame types,
// if we want aParams.ctx to be in user space, we first need to subtract the
// frame's position so that SVG painting can later add it again and the
// frame is painted in the right place.
gfxPoint toUserSpaceGfx =
SVGUtils::FrameSpaceInCSSPxToUserSpaceOffset(aFrame);
nsPoint toUserSpace =
nsPoint(nsPresContext::CSSPixelsToAppUnits(float(toUserSpaceGfx.x)),
nsPresContext::CSSPixelsToAppUnits(float(toUserSpaceGfx.y)));
result.offsetToUserSpace = result.offsetToBoundingBox - toUserSpace;
#ifdef DEBUG
bool hasSVGLayout = aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT);
NS_ASSERTION(
hasSVGLayout || result.offsetToBoundingBox == result.offsetToUserSpace,
"For non-SVG frames there shouldn't be any additional offset");
#endif
result.offsetToUserSpaceInDevPx = nsLayoutUtils::PointToGfxPoint(
result.offsetToUserSpace, aFrame->PresContext()->AppUnitsPerDevPixel());
return result;
}
/**
* Setup transform matrix of a gfx context by a specific frame. Move the
* origin of aParams.ctx to the user space of aFrame.
*/
static EffectOffsets MoveContextOriginToUserSpace(
nsIFrame* aFrame, const SVGIntegrationUtils::PaintFramesParams& aParams) {
EffectOffsets offset = ComputeEffectOffset(aFrame, aParams);
aParams.ctx.SetMatrixDouble(aParams.ctx.CurrentMatrixDouble().PreTranslate(
offset.offsetToUserSpaceInDevPx));
return offset;
}
gfxPoint SVGIntegrationUtils::GetOffsetToUserSpaceInDevPx(
nsIFrame* aFrame, const PaintFramesParams& aParams) {
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aFrame);
EffectOffsets offset = ComputeEffectOffset(firstFrame, aParams);
return offset.offsetToUserSpaceInDevPx;
}
/* static */
nsSize SVGIntegrationUtils::GetContinuationUnionSize(nsIFrame* aNonSVGFrame) {
NS_ASSERTION(!aNonSVGFrame->IsSVGFrame(), "SVG frames should not get here");
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aNonSVGFrame);
return nsLayoutUtils::GetAllInFlowRectsUnion(firstFrame, firstFrame).Size();
}
/* static */ gfx::Size SVGIntegrationUtils::GetSVGCoordContextForNonSVGFrame(
nsIFrame* aNonSVGFrame) {
NS_ASSERTION(!aNonSVGFrame->IsSVGFrame(), "SVG frames should not get here");
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aNonSVGFrame);
nsRect r = nsLayoutUtils::GetAllInFlowRectsUnion(firstFrame, firstFrame);
return gfx::Size(nsPresContext::AppUnitsToFloatCSSPixels(r.width),
nsPresContext::AppUnitsToFloatCSSPixels(r.height));
}
gfxRect SVGIntegrationUtils::GetSVGBBoxForNonSVGFrame(
nsIFrame* aNonSVGFrame, bool aUnionContinuations) {
// Except for SVGOuterSVGFrame, we shouldn't be getting here with SVG
// frames at all. This function is for elements that are laid out using the
// CSS box model rules.
NS_ASSERTION(!aNonSVGFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT),
"Frames with SVG layout should not get here");
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aNonSVGFrame);
// 'r' is in "user space":
nsRect r = (aUnionContinuations)
? GetPreEffectsInkOverflowUnion(
firstFrame, nullptr, nsRect(),
GetOffsetToBoundingBox(firstFrame), false)
: GetPreEffectsInkOverflow(firstFrame, aNonSVGFrame,
GetOffsetToBoundingBox(firstFrame));
return nsLayoutUtils::RectToGfxRect(r, AppUnitsPerCSSPixel());
}
// XXX Since we're called during reflow, this method is broken for frames with
// continuations. When we're called for a frame with continuations, we're
// called for each continuation in turn as it's reflowed. However, it isn't
// until the last continuation is reflowed that this method's
// GetOffsetToBoundingBox() and GetPreEffectsInkOverflowUnion() calls will
// obtain valid border boxes for all the continuations. As a result, we'll
// end up returning bogus post-filter ink overflow rects for all the prior
// continuations. Unfortunately, by the time the last continuation is
// reflowed, it's too late to go back and set and propagate the overflow
// rects on the previous continuations.
//
// The reason that we need to pass an override bbox to
// GetPreEffectsInkOverflowUnion rather than just letting it call into our
// GetSVGBBoxForNonSVGFrame method is because we get called by
// ComputeEffectsRect when it has been called with
// aStoreRectProperties set to false. In this case the pre-effects visual
// overflow rect that it has been passed may be different to that stored on
// aFrame, resulting in a different bbox.
//
// XXXjwatt The pre-effects ink overflow rect passed to
// ComputeEffectsRect won't include continuation overflows, so
// for frames with continuation the following filter analysis will likely end
// up being carried out with a bbox created as if the frame didn't have
// continuations.
//
// XXXjwatt Using aPreEffectsOverflowRect to create the bbox isn't really right
// for SVG frames, since for SVG frames the SVG spec defines the bbox to be
// something quite different to the pre-effects ink overflow rect. However,
// we're essentially calculating an invalidation area here, and using the
// pre-effects overflow rect will actually overestimate that area which, while
// being a bit wasteful, isn't otherwise a problem.
//
nsRect SVGIntegrationUtils::ComputePostEffectsInkOverflowRect(
nsIFrame* aFrame, const nsRect& aPreEffectsOverflowRect) {
MOZ_ASSERT(!aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT),
"Don't call this on SVG child frames");
MOZ_ASSERT(aFrame->StyleEffects()->HasFilters(),
"We should only be called if the frame is filtered, since filters "
"are the only effect that affects overflow.");
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aFrame);
// Note: we do not return here for eHasNoRefs since we must still handle any
// CSS filter functions.
// TODO: we should really return an empty rect for eHasRefsSomeInvalid since
// in that case we disable painting of the element.
nsTArray<SVGFilterFrame*> filterFrames;
if (SVGObserverUtils::GetAndObserveFilters(firstFrame, &filterFrames) ==
SVGObserverUtils::eHasRefsSomeInvalid) {
return aPreEffectsOverflowRect;
}
// Create an override bbox - see comment above:
nsPoint firstFrameToBoundingBox = GetOffsetToBoundingBox(firstFrame);
// overrideBBox is in "user space", in _CSS_ pixels:
// XXX Why are we rounding out to pixel boundaries? We don't do that in
// GetSVGBBoxForNonSVGFrame, and it doesn't appear to be necessary.
gfxRect overrideBBox = nsLayoutUtils::RectToGfxRect(
GetPreEffectsInkOverflowUnion(firstFrame, aFrame, aPreEffectsOverflowRect,
firstFrameToBoundingBox, true),
AppUnitsPerCSSPixel());
overrideBBox.RoundOut();
Maybe<nsRect> overflowRect = FilterInstance::GetPostFilterBounds(
firstFrame, filterFrames, &overrideBBox);
if (!overflowRect) {
return aPreEffectsOverflowRect;
}
// Return overflowRect relative to aFrame, rather than "user space":
return overflowRect.value() -
(aFrame->GetOffsetTo(firstFrame) + firstFrameToBoundingBox);
}
nsRect SVGIntegrationUtils::GetRequiredSourceForInvalidArea(
nsIFrame* aFrame, const nsRect& aDirtyRect) {
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aFrame);
// If we have any filters to observe then we should have started doing that
// during reflow/ComputeFrameEffectsRect, so we use GetFiltersIfObserving
// here to avoid needless work (or masking bugs by setting up observers at
// the wrong time).
nsTArray<SVGFilterFrame*> filterFrames;
if (!aFrame->StyleEffects()->HasFilters() ||
SVGObserverUtils::GetFiltersIfObserving(firstFrame, &filterFrames) ==
SVGObserverUtils::eHasRefsSomeInvalid) {
return aDirtyRect;
}
// Convert aDirtyRect into "user space" in app units:
nsPoint toUserSpace =
aFrame->GetOffsetTo(firstFrame) + GetOffsetToBoundingBox(firstFrame);
nsRect postEffectsRect = aDirtyRect + toUserSpace;
// Return ther result, relative to aFrame, not in user space:
return FilterInstance::GetPreFilterNeededArea(firstFrame, filterFrames,
postEffectsRect)
.GetBounds() -
toUserSpace;
}
bool SVGIntegrationUtils::HitTestFrameForEffects(nsIFrame* aFrame,
const nsPoint& aPt) {
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aFrame);
// Convert aPt to user space:
nsPoint toUserSpace;
if (aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
// XXXmstange Isn't this wrong for svg:use and innerSVG frames?
toUserSpace = aFrame->GetPosition();
} else {
toUserSpace =
aFrame->GetOffsetTo(firstFrame) + GetOffsetToBoundingBox(firstFrame);
}
nsPoint pt = aPt + toUserSpace;
gfxPoint userSpacePt = gfxPoint(pt.x, pt.y) / AppUnitsPerCSSPixel();
return SVGUtils::HitTestClip(firstFrame, userSpacePt);
}
using PaintFramesParams = SVGIntegrationUtils::PaintFramesParams;
/**
* Paint css-positioned-mask onto a given target(aMaskDT).
* Return value indicates if mask is complete.
*/
static bool PaintMaskSurface(const PaintFramesParams& aParams,
DrawTarget* aMaskDT, float aOpacity,
const ComputedStyle* aSC,
const nsTArray<SVGMaskFrame*>& aMaskFrames,
const nsPoint& aOffsetToUserSpace) {
MOZ_ASSERT(aMaskFrames.Length() > 0);
MOZ_ASSERT(aMaskDT->GetFormat() == SurfaceFormat::A8);
MOZ_ASSERT(aOpacity == 1.0 || aMaskFrames.Length() == 1);
const nsStyleSVGReset* svgReset = aSC->StyleSVGReset();
gfxMatrix cssPxToDevPxMatrix = SVGUtils::GetCSSPxToDevPxMatrix(aParams.frame);
nsPresContext* presContext = aParams.frame->PresContext();
gfxPoint devPixelOffsetToUserSpace = nsLayoutUtils::PointToGfxPoint(
aOffsetToUserSpace, presContext->AppUnitsPerDevPixel());
gfxContext maskContext(aMaskDT, /* aPreserveTransform */ true);
bool isMaskComplete = true;
// Multiple SVG masks interleave with image mask. Paint each layer onto
// aMaskDT one at a time.
for (int i = aMaskFrames.Length() - 1; i >= 0; i--) {
SVGMaskFrame* maskFrame = aMaskFrames[i];
CompositionOp compositionOp =
(i == int(aMaskFrames.Length() - 1))
? CompositionOp::OP_OVER
: nsCSSRendering::GetGFXCompositeMode(
svgReset->mMask.mLayers[i].mComposite);
// maskFrame != nullptr means we get a SVG mask.
// maskFrame == nullptr means we get an image mask.
if (maskFrame) {
SVGMaskFrame::MaskParams params(
maskContext.GetDrawTarget(), aParams.frame, cssPxToDevPxMatrix,
aOpacity, svgReset->mMask.mLayers[i].mMaskMode, aParams.imgParams);
RefPtr<SourceSurface> svgMask = maskFrame->GetMaskForMaskedFrame(params);
if (svgMask) {
Matrix tmp = aMaskDT->GetTransform();
aMaskDT->SetTransform(Matrix());
aMaskDT->MaskSurface(ColorPattern(DeviceColor(0.0, 0.0, 0.0, 1.0)),
svgMask, Point(0, 0),
DrawOptions(1.0, compositionOp));
aMaskDT->SetTransform(tmp);
}
} else if (svgReset->mMask.mLayers[i].mImage.IsResolved()) {
gfxContextMatrixAutoSaveRestore matRestore(&maskContext);
maskContext.Multiply(gfxMatrix::Translation(-devPixelOffsetToUserSpace));
nsCSSRendering::PaintBGParams params =
nsCSSRendering::PaintBGParams::ForSingleLayer(
*presContext, aParams.dirtyRect, aParams.borderArea,
aParams.frame,
aParams.builder->GetBackgroundPaintFlags() |
nsCSSRendering::PAINTBG_MASK_IMAGE,
i, compositionOp, aOpacity);
aParams.imgParams.result &= nsCSSRendering::PaintStyleImageLayerWithSC(
params, maskContext, aSC, *aParams.frame->StyleBorder());
} else {
isMaskComplete = false;
}
}
return isMaskComplete;
}
struct MaskPaintResult {
RefPtr<SourceSurface> maskSurface;
Matrix maskTransform;
bool transparentBlackMask;
bool opacityApplied;
MaskPaintResult() : transparentBlackMask(false), opacityApplied(false) {}
};
static MaskPaintResult CreateAndPaintMaskSurface(
const PaintFramesParams& aParams, float aOpacity, const ComputedStyle* aSC,
const nsTArray<SVGMaskFrame*>& aMaskFrames,
const nsPoint& aOffsetToUserSpace) {
const nsStyleSVGReset* svgReset = aSC->StyleSVGReset();
MOZ_ASSERT(aMaskFrames.Length() > 0);
MaskPaintResult paintResult;
gfxContext& ctx = aParams.ctx;
// Optimization for single SVG mask.
if (((aMaskFrames.Length() == 1) && aMaskFrames[0])) {
gfxMatrix cssPxToDevPxMatrix =
SVGUtils::GetCSSPxToDevPxMatrix(aParams.frame);
paintResult.opacityApplied = true;
SVGMaskFrame::MaskParams params(
ctx.GetDrawTarget(), aParams.frame, cssPxToDevPxMatrix, aOpacity,
svgReset->mMask.mLayers[0].mMaskMode, aParams.imgParams);
paintResult.maskSurface = aMaskFrames[0]->GetMaskForMaskedFrame(params);
paintResult.maskTransform = ctx.CurrentMatrix();
paintResult.maskTransform.Invert();
if (!paintResult.maskSurface) {
paintResult.transparentBlackMask = true;
}
return paintResult;
}
const LayoutDeviceRect& maskSurfaceRect =
aParams.maskRect.valueOr(LayoutDeviceRect());
if (aParams.maskRect.isSome() && maskSurfaceRect.IsEmpty()) {
// XXX: Is this ever true?
paintResult.transparentBlackMask = true;
return paintResult;
}
RefPtr<DrawTarget> maskDT = ctx.GetDrawTarget()->CreateClippedDrawTarget(
maskSurfaceRect.ToUnknownRect(), SurfaceFormat::A8);
if (!maskDT || !maskDT->IsValid()) {
return paintResult;
}
// We can paint mask along with opacity only if
// 1. There is only one mask, or
// 2. No overlap among masks.
// Collision detect in #2 is not that trivial, we only accept #1 here.
paintResult.opacityApplied = (aMaskFrames.Length() == 1);
// Set context's matrix on maskContext, offset by the maskSurfaceRect's
// position. This makes sure that we combine the masks in device space.
Matrix maskSurfaceMatrix = ctx.CurrentMatrix();
bool isMaskComplete = PaintMaskSurface(
aParams, maskDT, paintResult.opacityApplied ? aOpacity : 1.0, aSC,
aMaskFrames, aOffsetToUserSpace);
if (!isMaskComplete ||
(aParams.imgParams.result != ImgDrawResult::SUCCESS &&
aParams.imgParams.result != ImgDrawResult::SUCCESS_NOT_COMPLETE &&
aParams.imgParams.result != ImgDrawResult::WRONG_SIZE)) {
// Now we know the status of mask resource since we used it while painting.
// According to the return value of PaintMaskSurface, we know whether mask
// resource is resolvable or not.
//
// For a HTML doc:
// According to css-masking spec, always create a mask surface when
// we have any item in maskFrame even if all of those items are
// non-resolvable <mask-sources> or <images>.
// Set paintResult.transparentBlackMask as true, the caller should stop
// painting masked content as if this mask is a transparent black one.
// For a SVG doc:
// SVG 1.1 say that if we fail to resolve a mask, we should draw the
// object unmasked.
// Left paintResult.maskSurface empty, the caller should paint all
// masked content as if this mask is an opaque white one(no mask).
paintResult.transparentBlackMask =
!aParams.frame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT);
MOZ_ASSERT(!paintResult.maskSurface);
return paintResult;
}
paintResult.maskTransform = maskSurfaceMatrix;
if (!paintResult.maskTransform.Invert()) {
return paintResult;
}
paintResult.maskSurface = maskDT->Snapshot();
return paintResult;
}
static bool ValidateSVGFrame(nsIFrame* aFrame) {
NS_ASSERTION(
!aFrame->HasAllStateBits(NS_FRAME_SVG_LAYOUT | NS_FRAME_IS_NONDISPLAY),
"Should not use SVGIntegrationUtils on this SVG frame");
if (aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
#ifdef DEBUG
ISVGDisplayableFrame* svgFrame = do_QueryFrame(aFrame);
MOZ_ASSERT(svgFrame && aFrame->GetContent()->IsSVGElement(),
"A non-SVG frame carries NS_FRAME_SVG_LAYOUT flag?");
#endif
const nsIContent* content = aFrame->GetContent();
if (!static_cast<const SVGElement*>(content)->HasValidDimensions()) {
// The SVG spec says not to draw _anything_
return false;
}
}
return true;
}
bool SVGIntegrationUtils::PaintMask(const PaintFramesParams& aParams,
bool& aOutIsMaskComplete) {
aOutIsMaskComplete = true;
SVGUtils::MaskUsage maskUsage =
SVGUtils::DetermineMaskUsage(aParams.frame, aParams.handleOpacity);
if (!maskUsage.ShouldDoSomething()) {
return false;
}
nsIFrame* frame = aParams.frame;
if (!ValidateSVGFrame(frame)) {
return false;
}
gfxContext& ctx = aParams.ctx;
RefPtr<DrawTarget> maskTarget = ctx.GetDrawTarget();
if (maskUsage.ShouldGenerateMaskLayer() && maskUsage.HasSVGClip()) {
// We will paint both mask of positioned mask and clip-path into
// maskTarget.
//
// Create one extra draw target for drawing positioned mask, so that we do
// not have to copy the content of maskTarget before painting
// clip-path into it.
maskTarget = maskTarget->CreateClippedDrawTarget(Rect(), SurfaceFormat::A8);
}
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(frame);
nsTArray<SVGMaskFrame*> maskFrames;
// XXX check return value?
SVGObserverUtils::GetAndObserveMasks(firstFrame, &maskFrames);
gfxGroupForBlendAutoSaveRestore autoPop(&ctx);
bool shouldPushOpacity = !maskUsage.IsOpaque() && maskFrames.Length() != 1;
if (shouldPushOpacity) {
autoPop.PushGroupForBlendBack(gfxContentType::COLOR_ALPHA,
maskUsage.Opacity());
}
gfxContextMatrixAutoSaveRestore matSR;
// Paint clip-path-basic-shape onto ctx
gfxContextAutoSaveRestore basicShapeSR;
if (maskUsage.ShouldApplyBasicShapeOrPath()) {
matSR.SetContext(&ctx);
MoveContextOriginToUserSpace(firstFrame, aParams);
basicShapeSR.SetContext(&ctx);
gfxMatrix mat = SVGUtils::GetCSSPxToDevPxMatrix(frame);
if (!maskUsage.ShouldGenerateMaskLayer()) {
// Only have basic-shape clip-path effect. Fill clipped region by
// opaque white.
ctx.SetDeviceColor(DeviceColor::MaskOpaqueWhite());
RefPtr<Path> path = CSSClipPathInstance::CreateClipPathForFrame(
ctx.GetDrawTarget(), frame, mat);
if (path) {
ctx.SetPath(path);
ctx.Fill();
}
return true;
}
CSSClipPathInstance::ApplyBasicShapeOrPathClip(ctx, frame, mat);
}
// Paint mask into maskTarget.
if (maskUsage.ShouldGenerateMaskLayer()) {
matSR.Restore();
matSR.SetContext(&ctx);
EffectOffsets offsets = ComputeEffectOffset(frame, aParams);
maskTarget->SetTransform(maskTarget->GetTransform().PreTranslate(
ToPoint(offsets.offsetToUserSpaceInDevPx)));
aOutIsMaskComplete = PaintMaskSurface(
aParams, maskTarget, shouldPushOpacity ? 1.0f : maskUsage.Opacity(),
firstFrame->Style(), maskFrames, offsets.offsetToUserSpace);
}
// Paint clip-path onto ctx.
if (maskUsage.HasSVGClip()) {
matSR.Restore();
matSR.SetContext(&ctx);
MoveContextOriginToUserSpace(firstFrame, aParams);
Matrix clipMaskTransform;
gfxMatrix cssPxToDevPxMatrix = SVGUtils::GetCSSPxToDevPxMatrix(frame);
SVGClipPathFrame* clipPathFrame;
// XXX check return value?
SVGObserverUtils::GetAndObserveClipPath(firstFrame, &clipPathFrame);
RefPtr<SourceSurface> maskSurface =
maskUsage.ShouldGenerateMaskLayer() ? maskTarget->Snapshot() : nullptr;
clipPathFrame->PaintClipMask(ctx, frame, cssPxToDevPxMatrix, maskSurface);
}
return true;
}
template <class T>
void PaintMaskAndClipPathInternal(const PaintFramesParams& aParams,
const T& aPaintChild) {
#ifdef DEBUG
const nsStyleSVGReset* style = aParams.frame->StyleSVGReset();
MOZ_ASSERT(style->HasClipPath() || style->HasMask(),
"Should not use this method when no mask or clipPath effect"
"on this frame");
#endif
/* SVG defines the following rendering model:
*
* 1. Render geometry
* 2. Apply filter
* 3. Apply clipping, masking, group opacity
*
* We handle #3 here and perform a couple of optimizations:
*
* + Use cairo's clipPath when representable natively (single object
* clip region).
*
* + Merge opacity and masking if both used together.
*/
nsIFrame* frame = aParams.frame;
if (!ValidateSVGFrame(frame)) {
return;
}
SVGUtils::MaskUsage maskUsage =
SVGUtils::DetermineMaskUsage(aParams.frame, aParams.handleOpacity);
if (maskUsage.IsTransparent()) {
return;
}
gfxContext& context = aParams.ctx;
gfxContextMatrixAutoSaveRestore matrixAutoSaveRestore(&context);
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(frame);
SVGClipPathFrame* clipPathFrame;
// XXX check return value?
SVGObserverUtils::GetAndObserveClipPath(firstFrame, &clipPathFrame);
nsTArray<SVGMaskFrame*> maskFrames;
// XXX check return value?
SVGObserverUtils::GetAndObserveMasks(firstFrame, &maskFrames);
gfxMatrix cssPxToDevPxMatrix = SVGUtils::GetCSSPxToDevPxMatrix(frame);
bool shouldPushMask = false;
gfxGroupForBlendAutoSaveRestore autoGroupForBlend(&context);
/* Check if we need to do additional operations on this child's
* rendering, which necessitates rendering into another surface. */
if (maskUsage.ShouldGenerateMask()) {
gfxContextMatrixAutoSaveRestore matSR;
RefPtr<SourceSurface> maskSurface;
bool opacityApplied = false;
if (maskUsage.ShouldGenerateMaskLayer()) {
matSR.SetContext(&context);
// For css-mask, we want to generate a mask for each continuation frame,
// so we setup context matrix by the position of the current frame,
// instead of the first continuation frame.
EffectOffsets offsets = MoveContextOriginToUserSpace(frame, aParams);
MaskPaintResult paintResult = CreateAndPaintMaskSurface(
aParams, maskUsage.Opacity(), firstFrame->Style(), maskFrames,
offsets.offsetToUserSpace);
if (paintResult.transparentBlackMask) {
return;
}
maskSurface = paintResult.maskSurface;
if (maskSurface) {
shouldPushMask = true;
opacityApplied = paintResult.opacityApplied;
}
}
if (maskUsage.ShouldGenerateClipMaskLayer()) {
matSR.Restore();
matSR.SetContext(&context);
MoveContextOriginToUserSpace(firstFrame, aParams);
RefPtr<SourceSurface> clipMaskSurface = clipPathFrame->GetClipMask(
context, frame, cssPxToDevPxMatrix, maskSurface);
if (clipMaskSurface) {
maskSurface = clipMaskSurface;
} else {
// Either entire surface is clipped out, or gfx buffer allocation
// failure in SVGClipPathFrame::GetClipMask.
return;
}
shouldPushMask = true;
}
// opacity != 1.0f.
if (!maskUsage.ShouldGenerateLayer()) {
MOZ_ASSERT(!maskUsage.IsOpaque());
matSR.SetContext(&context);
MoveContextOriginToUserSpace(firstFrame, aParams);
shouldPushMask = true;
}
if (shouldPushMask) {
// We want the mask to be untransformed so use the inverse of the
// current transform as the maskTransform to compensate.
Matrix maskTransform = context.CurrentMatrix();
maskTransform.Invert();
autoGroupForBlend.PushGroupForBlendBack(
gfxContentType::COLOR_ALPHA,
opacityApplied ? 1.0f : maskUsage.Opacity(), maskSurface,
maskTransform);
}
}
/* If this frame has only a trivial clipPath, set up cairo's clipping now so
* we can just do normal painting and get it clipped appropriately.
*/
if (maskUsage.ShouldApplyClipPath() ||
maskUsage.ShouldApplyBasicShapeOrPath()) {
gfxContextMatrixAutoSaveRestore matSR(&context);
MoveContextOriginToUserSpace(firstFrame, aParams);
MOZ_ASSERT(!maskUsage.ShouldApplyClipPath() ||
!maskUsage.ShouldApplyBasicShapeOrPath());
if (maskUsage.ShouldApplyClipPath()) {
clipPathFrame->ApplyClipPath(context, frame, cssPxToDevPxMatrix);
} else {
CSSClipPathInstance::ApplyBasicShapeOrPathClip(context, frame,
cssPxToDevPxMatrix);
}
}
/* Paint the child */
context.SetMatrix(matrixAutoSaveRestore.Matrix());
aPaintChild();
if (StaticPrefs::layers_draw_mask_debug()) {
gfxContextAutoSaveRestore saver(&context);
context.NewPath();
gfxRect drawingRect = nsLayoutUtils::RectToGfxRect(
aParams.borderArea, frame->PresContext()->AppUnitsPerDevPixel());
context.SnappedRectangle(drawingRect);
sRGBColor overlayColor(0.0f, 0.0f, 0.0f, 0.8f);
if (maskUsage.ShouldGenerateMaskLayer()) {
overlayColor.r = 1.0f; // red represents css positioned mask.
}
if (maskUsage.HasSVGClip()) {
overlayColor.g = 1.0f; // green represents clip-path:<clip-source>.
}
if (maskUsage.ShouldApplyBasicShapeOrPath()) {
overlayColor.b = 1.0f; // blue represents
// clip-path:<basic-shape>||<geometry-box>.
}
context.SetColor(overlayColor);
context.Fill();
}
if (maskUsage.ShouldApplyClipPath() ||
maskUsage.ShouldApplyBasicShapeOrPath()) {
context.PopClip();
}
}
void SVGIntegrationUtils::PaintMaskAndClipPath(
const PaintFramesParams& aParams,
const std::function<void()>& aPaintChild) {
PaintMaskAndClipPathInternal(aParams, aPaintChild);
}
void SVGIntegrationUtils::PaintFilter(const PaintFramesParams& aParams,
Span<const StyleFilter> aFilters,
const SVGFilterPaintCallback& aCallback) {
MOZ_ASSERT(!aParams.builder->IsForGenerateGlyphMask(),
"Filter effect is discarded while generating glyph mask.");
MOZ_ASSERT(!aFilters.IsEmpty(),
"Should not use this method when no filter effect on this frame");
nsIFrame* frame = aParams.frame;
if (!ValidateSVGFrame(frame)) {
return;
}
float opacity = SVGUtils::ComputeOpacity(frame, aParams.handleOpacity);
if (opacity == 0.0f) {
return;
}
// Properties are added lazily and may have been removed by a restyle, so make
// sure all applicable ones are set again.
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(frame);
// Note: we do not return here for eHasNoRefs since we must still handle any
// CSS filter functions.
// XXX: Do we need to check for eHasRefsSomeInvalid here given that
// nsDisplayFilter::BuildLayer returns nullptr for eHasRefsSomeInvalid?
// Or can we just assert !eHasRefsSomeInvalid?
nsTArray<SVGFilterFrame*> filterFrames;
if (SVGObserverUtils::GetAndObserveFilters(firstFrame, &filterFrames) ==
SVGObserverUtils::eHasRefsSomeInvalid) {
aCallback(aParams.ctx, aParams.imgParams, nullptr, nullptr);
return;
}
gfxContext& context = aParams.ctx;
gfxContextAutoSaveRestore autoSR(&context);
EffectOffsets offsets = MoveContextOriginToUserSpace(firstFrame, aParams);
/* Paint the child and apply filters */
nsRegion dirtyRegion = aParams.dirtyRect - offsets.offsetToBoundingBox;
FilterInstance::PaintFilteredFrame(frame, aFilters, filterFrames, &context,
aCallback, &dirtyRegion, aParams.imgParams,
opacity);
}
bool SVGIntegrationUtils::CreateWebRenderCSSFilters(
Span<const StyleFilter> aFilters, nsIFrame* aFrame,
WrFiltersHolder& aWrFilters) {
// All CSS filters are supported by WebRender. SVG filters are not fully
// supported, those use NS_STYLE_FILTER_URL and are handled separately.
// If there are too many filters to render, then just pretend that we
// succeeded, and don't render any of them.
if (aFilters.Length() >
StaticPrefs::gfx_webrender_max_filter_ops_per_chain()) {
return true;
}
aWrFilters.filters.SetCapacity(aFilters.Length());
auto& wrFilters = aWrFilters.filters;
for (const StyleFilter& filter : aFilters) {
switch (filter.tag) {
case StyleFilter::Tag::Brightness:
wrFilters.AppendElement(
wr::FilterOp::Brightness(filter.AsBrightness()));
break;
case StyleFilter::Tag::Contrast:
wrFilters.AppendElement(wr::FilterOp::Contrast(filter.AsContrast()));
break;
case StyleFilter::Tag::Grayscale:
wrFilters.AppendElement(wr::FilterOp::Grayscale(filter.AsGrayscale()));
break;
case StyleFilter::Tag::Invert:
wrFilters.AppendElement(wr::FilterOp::Invert(filter.AsInvert()));
break;
case StyleFilter::Tag::Opacity: {
float opacity = filter.AsOpacity();
wrFilters.AppendElement(wr::FilterOp::Opacity(
wr::PropertyBinding<float>::Value(opacity), opacity));
break;
}
case StyleFilter::Tag::Saturate:
wrFilters.AppendElement(wr::FilterOp::Saturate(filter.AsSaturate()));
break;
case StyleFilter::Tag::Sepia:
wrFilters.AppendElement(wr::FilterOp::Sepia(filter.AsSepia()));
break;
case StyleFilter::Tag::HueRotate: {
wrFilters.AppendElement(
wr::FilterOp::HueRotate(filter.AsHueRotate().ToDegrees()));
break;
}
case StyleFilter::Tag::Blur: {
// TODO(emilio): we should go directly from css pixels -> device pixels.
float appUnitsPerDevPixel =
aFrame->PresContext()->AppUnitsPerDevPixel();
float radius = NSAppUnitsToFloatPixels(filter.AsBlur().ToAppUnits(),
appUnitsPerDevPixel);
wrFilters.AppendElement(wr::FilterOp::Blur(radius, radius));
break;
}
case StyleFilter::Tag::DropShadow: {
float appUnitsPerDevPixel =
aFrame->PresContext()->AppUnitsPerDevPixel();
const StyleSimpleShadow& shadow = filter.AsDropShadow();
nscolor color = shadow.color.CalcColor(aFrame);
wr::Shadow wrShadow;
wrShadow.offset = {
NSAppUnitsToFloatPixels(shadow.horizontal.ToAppUnits(),
appUnitsPerDevPixel),
NSAppUnitsToFloatPixels(shadow.vertical.ToAppUnits(),
appUnitsPerDevPixel)};
wrShadow.blur_radius = NSAppUnitsToFloatPixels(shadow.blur.ToAppUnits(),
appUnitsPerDevPixel);
wrShadow.color = {NS_GET_R(color) / 255.0f, NS_GET_G(color) / 255.0f,
NS_GET_B(color) / 255.0f, NS_GET_A(color) / 255.0f};
wrFilters.AppendElement(wr::FilterOp::DropShadow(wrShadow));
break;
}
default:
return false;
}
}
return true;
}
bool SVGIntegrationUtils::BuildWebRenderFilters(
nsIFrame* aFilteredFrame, Span<const StyleFilter> aFilters,
WrFiltersHolder& aWrFilters, bool& aInitialized) {
return FilterInstance::BuildWebRenderFilters(aFilteredFrame, aFilters,
aWrFilters, aInitialized);
}
bool SVGIntegrationUtils::CanCreateWebRenderFiltersForFrame(nsIFrame* aFrame) {
WrFiltersHolder wrFilters;
auto filterChain = aFrame->StyleEffects()->mFilters.AsSpan();
bool initialized = true;
return CreateWebRenderCSSFilters(filterChain, aFrame, wrFilters) ||
BuildWebRenderFilters(aFrame, filterChain, wrFilters, initialized);
}
bool SVGIntegrationUtils::UsesSVGEffectsNotSupportedInCompositor(
nsIFrame* aFrame) {
// WebRender supports masks / clip-paths and some filters in the compositor.
if (aFrame->StyleEffects()->HasFilters()) {
return !SVGIntegrationUtils::CanCreateWebRenderFiltersForFrame(aFrame);
}
return false;
}
class PaintFrameCallback : public gfxDrawingCallback {
public:
PaintFrameCallback(nsIFrame* aFrame, const nsSize aPaintServerSize,
const IntSize aRenderSize, uint32_t aFlags)
: mFrame(aFrame),
mPaintServerSize(aPaintServerSize),
mRenderSize(aRenderSize),
mFlags(aFlags) {}
virtual bool operator()(gfxContext* aContext, const gfxRect& aFillRect,
const SamplingFilter aSamplingFilter,
const gfxMatrix& aTransform) override;
private:
nsIFrame* mFrame;
nsSize mPaintServerSize;
IntSize mRenderSize;
uint32_t mFlags;
};
bool PaintFrameCallback::operator()(gfxContext* aContext,
const gfxRect& aFillRect,
const SamplingFilter aSamplingFilter,
const gfxMatrix& aTransform) {
if (mFrame->HasAnyStateBits(NS_FRAME_DRAWING_AS_PAINTSERVER)) {
return false;
}
AutoSetRestorePaintServerState paintServer(mFrame);
aContext->Save();
// Clip to aFillRect so that we don't paint outside.
aContext->Clip(aFillRect);
gfxMatrix invmatrix = aTransform;
if (!invmatrix.Invert()) {
return false;
}
aContext->Multiply(invmatrix);
// nsLayoutUtils::PaintFrame will anchor its painting at mFrame. But we want
// to have it anchored at the top left corner of the bounding box of all of
// mFrame's continuations. So we add a translation transform.
int32_t appUnitsPerDevPixel = mFrame->PresContext()->AppUnitsPerDevPixel();
nsPoint offset = SVGIntegrationUtils::GetOffsetToBoundingBox(mFrame);
gfxPoint devPxOffset = gfxPoint(offset.x, offset.y) / appUnitsPerDevPixel;
aContext->Multiply(gfxMatrix::Translation(devPxOffset));
gfxSize paintServerSize =
gfxSize(mPaintServerSize.width, mPaintServerSize.height) /
mFrame->PresContext()->AppUnitsPerDevPixel();
// nsLayoutUtils::PaintFrame wants to render with paintServerSize, but we
// want it to render with mRenderSize, so we need to set up a scale transform.
gfxFloat scaleX = mRenderSize.width / paintServerSize.width;
gfxFloat scaleY = mRenderSize.height / paintServerSize.height;
aContext->Multiply(gfxMatrix::Scaling(scaleX, scaleY));
// Draw.
nsRect dirty(-offset.x, -offset.y, mPaintServerSize.width,
mPaintServerSize.height);
using PaintFrameFlags = nsLayoutUtils::PaintFrameFlags;
PaintFrameFlags flags = PaintFrameFlags::InTransform;
if (mFlags & SVGIntegrationUtils::FLAG_SYNC_DECODE_IMAGES) {
flags |= PaintFrameFlags::SyncDecodeImages;
}
nsLayoutUtils::PaintFrame(aContext, mFrame, dirty, NS_RGBA(0, 0, 0, 0),
nsDisplayListBuilderMode::Painting, flags);
nsIFrame* currentFrame = mFrame;
while ((currentFrame = currentFrame->GetNextContinuation()) != nullptr) {
offset = currentFrame->GetOffsetToCrossDoc(mFrame);
devPxOffset = gfxPoint(offset.x, offset.y) / appUnitsPerDevPixel;
aContext->Save();
aContext->Multiply(gfxMatrix::Scaling(1 / scaleX, 1 / scaleY));
aContext->Multiply(gfxMatrix::Translation(devPxOffset));
aContext->Multiply(gfxMatrix::Scaling(scaleX, scaleY));
nsLayoutUtils::PaintFrame(aContext, currentFrame, dirty - offset,
NS_RGBA(0, 0, 0, 0),
nsDisplayListBuilderMode::Painting, flags);
aContext->Restore();
}
aContext->Restore();
return true;
}
/* static */
already_AddRefed<gfxDrawable> SVGIntegrationUtils::DrawableFromPaintServer(
nsIFrame* aFrame, nsIFrame* aTarget, const nsSize& aPaintServerSize,
const IntSize& aRenderSize, const DrawTarget* aDrawTarget,
const gfxMatrix& aContextMatrix, uint32_t aFlags) {
// aPaintServerSize is the size that would be filled when using
// background-repeat:no-repeat and background-size:auto. For normal background
// images, this would be the intrinsic size of the image; for gradients and
// patterns this would be the whole target frame fill area.
// aRenderSize is what we will be actually filling after accounting for
// background-size.
if (SVGPaintServerFrame* server = do_QueryFrame(aFrame)) {
// aFrame is either a pattern or a gradient. These fill the whole target
// frame by default, so aPaintServerSize is the whole target background fill
// area.
gfxRect overrideBounds(0, 0, aPaintServerSize.width,
aPaintServerSize.height);
overrideBounds.Scale(1.0 / aFrame->PresContext()->AppUnitsPerDevPixel());
uint32_t imgFlags = imgIContainer::FLAG_ASYNC_NOTIFY;
if (aFlags & SVGIntegrationUtils::FLAG_SYNC_DECODE_IMAGES) {
imgFlags |= imgIContainer::FLAG_SYNC_DECODE;
}
imgDrawingParams imgParams(imgFlags);
RefPtr<gfxPattern> pattern = server->GetPaintServerPattern(
aTarget, aDrawTarget, aContextMatrix, &nsStyleSVG::mFill, 1.0,
imgParams, &overrideBounds);
if (!pattern) {
return nullptr;
}
// pattern is now set up to fill aPaintServerSize. But we want it to
// fill aRenderSize, so we need to add a scaling transform.
// We couldn't just have set overrideBounds to aRenderSize - it would have
// worked for gradients, but for patterns it would result in a different
// pattern size.
gfxFloat scaleX = overrideBounds.Width() / aRenderSize.width;
gfxFloat scaleY = overrideBounds.Height() / aRenderSize.height;
gfxMatrix scaleMatrix = gfxMatrix::Scaling(scaleX, scaleY);
pattern->SetMatrix(scaleMatrix * pattern->GetMatrix());
RefPtr<gfxDrawable> drawable = new gfxPatternDrawable(pattern, aRenderSize);
return drawable.forget();
}
if (aFrame->IsSVGFrame() &&
!static_cast<ISVGDisplayableFrame*>(do_QueryFrame(aFrame))) {
MOZ_ASSERT_UNREACHABLE(
"We should prevent painting of unpaintable SVG "
"before we get here");
return nullptr;
}
// We don't want to paint into a surface as long as we don't need to, so we
// set up a drawing callback.
RefPtr<gfxDrawingCallback> cb =
new PaintFrameCallback(aFrame, aPaintServerSize, aRenderSize, aFlags);
RefPtr<gfxDrawable> drawable = new gfxCallbackDrawable(cb, aRenderSize);
return drawable.forget();
}
} // namespace mozilla
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