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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 */
#include <vector>
#include <sstream>
#include "SourceSurfaceDual.h"
#include "2D.h"
#include "Filters.h"
namespace mozilla {
namespace gfx {
#define FORWARD_FUNCTION(funcName) \
virtual void funcName() override { \
mA->funcName(); \
mB->funcName(); \
#define FORWARD_FUNCTION1(funcName, var1Type, var1Name) \
virtual void funcName(var1Type var1Name) override { \
mA->funcName(var1Name); \
mB->funcName(var1Name); \
/* This is a special type of DrawTarget. It duplicates all drawing calls
* accross two drawtargets. An exception to this is when a snapshot of another
* dual DrawTarget is used as the source for any surface data. In this case
* the snapshot of the first source DrawTarget is used as a source for the call
* to the first destination DrawTarget (mA) and the snapshot of the second
* source DrawTarget is used at the source for the second destination
* DrawTarget (mB). This class facilitates black-background/white-background
* drawing for per-component alpha extraction for backends which do not support
* native component alpha.
class DrawTargetDual : public DrawTarget {
virtual bool IsValid() const override {
return mA->IsValid() && mB->IsValid();
DrawTargetDual(DrawTarget* aA, DrawTarget* aB) : mA(aA), mB(aB) {
mFormat = aA->GetFormat();
virtual DrawTargetType GetType() const override { return mA->GetType(); }
virtual BackendType GetBackendType() const override {
return mA->GetBackendType();
virtual already_AddRefed<SourceSurface> Snapshot() override {
return MakeAndAddRef<SourceSurfaceDual>(mA, mB);
virtual IntSize GetSize() const override { return mA->GetSize(); }
virtual void DetachAllSnapshots() override;
FORWARD_FUNCTION1(PushClip, const Path*, aPath)
FORWARD_FUNCTION1(PushClipRect, const Rect&, aRect)
virtual void SetTransform(const Matrix& aTransform) override {
mTransform = aTransform;
virtual bool SupportsRegionClipping() const override {
return mA->SupportsRegionClipping() && mB->SupportsRegionClipping();
virtual void DrawSurface(SourceSurface* aSurface, const Rect& aDest,
const Rect& aSource,
const DrawSurfaceOptions& aSurfOptions,
const DrawOptions& aOptions) override;
virtual void DrawFilter(
FilterNode* aNode, const Rect& aSourceRect, const Point& aDestPoint,
const DrawOptions& aOptions = DrawOptions()) override {
mA->DrawFilter(aNode, aSourceRect, aDestPoint, aOptions);
mB->DrawFilter(aNode, aSourceRect, aDestPoint, aOptions);
virtual void MaskSurface(
const Pattern& aSource, SourceSurface* aMask, Point aOffset,
const DrawOptions& aOptions = DrawOptions()) override;
virtual void DrawSurfaceWithShadow(SourceSurface* aSurface,
const Point& aDest,
const DeviceColor& aColor,
const Point& aOffset, Float aSigma,
CompositionOp aOp) override;
virtual void ClearRect(const Rect& aRect) override;
virtual void CopySurface(SourceSurface* aSurface, const IntRect& aSourceRect,
const IntPoint& aDestination) override;
virtual void FillRect(const Rect& aRect, const Pattern& aPattern,
const DrawOptions& aOptions) override;
virtual void StrokeRect(const Rect& aRect, const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions) override;
virtual void StrokeLine(const Point& aStart, const Point& aEnd,
const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions) override;
virtual void Stroke(const Path* aPath, const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions) override;
virtual void Fill(const Path* aPath, const Pattern& aPattern,
const DrawOptions& aOptions) override;
virtual void FillGlyphs(ScaledFont* aScaledFont, const GlyphBuffer& aBuffer,
const Pattern& aPattern,
const DrawOptions& aOptions) override;
virtual void Mask(const Pattern& aSource, const Pattern& aMask,
const DrawOptions& aOptions) override;
virtual void PushLayer(bool aOpaque, Float aOpacity, SourceSurface* aMask,
const Matrix& aMaskTransform,
const IntRect& aBounds = IntRect(),
bool aCopyBackground = false) override;
virtual bool Unrotate(IntPoint aRotation) override {
return mA->Unrotate(aRotation) && mB->Unrotate(aRotation);
virtual already_AddRefed<SourceSurface> CreateSourceSurfaceFromData(
unsigned char* aData, const IntSize& aSize, int32_t aStride,
SurfaceFormat aFormat) const override {
return mA->CreateSourceSurfaceFromData(aData, aSize, aStride, aFormat);
virtual already_AddRefed<SourceSurface> OptimizeSourceSurface(
SourceSurface* aSurface) const override {
return mA->OptimizeSourceSurface(aSurface);
virtual already_AddRefed<SourceSurface> CreateSourceSurfaceFromNativeSurface(
const NativeSurface& aSurface) const override {
return mA->CreateSourceSurfaceFromNativeSurface(aSurface);
virtual already_AddRefed<DrawTarget> CreateSimilarDrawTarget(
const IntSize& aSize, SurfaceFormat aFormat) const override;
virtual bool CanCreateSimilarDrawTarget(const IntSize& aSize,
SurfaceFormat aFormat) const override;
virtual RefPtr<DrawTarget> CreateClippedDrawTarget(
const Rect& aBounds, SurfaceFormat aFormat) override;
virtual already_AddRefed<PathBuilder> CreatePathBuilder(
FillRule aFillRule = FillRule::FILL_WINDING) const override {
return mA->CreatePathBuilder(aFillRule);
virtual already_AddRefed<GradientStops> CreateGradientStops(
GradientStop* aStops, uint32_t aNumStops,
ExtendMode aExtendMode = ExtendMode::CLAMP) const override {
return mA->CreateGradientStops(aStops, aNumStops, aExtendMode);
virtual already_AddRefed<FilterNode> CreateFilter(FilterType aType) override {
return mA->CreateFilter(aType);
virtual void* GetNativeSurface(NativeSurfaceType aType) override {
return nullptr;
virtual bool IsDualDrawTarget() const override { return true; }
virtual bool IsCurrentGroupOpaque() override {
return mA->IsCurrentGroupOpaque();
RefPtr<DrawTarget> mA;
RefPtr<DrawTarget> mB;
} // namespace gfx
} // namespace mozilla