gecko-dev/gfx/2d/DrawTargetDual.h

/* -*- 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/. */

#ifndef MOZILLA_GFX_DRAWTARGETDUAL_H_
#define MOZILLA_GFX_DRAWTARGETDUAL_H_

#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 {
 public:
  MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(DrawTargetDual, override)
  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_FUNCTION(Flush)
  FORWARD_FUNCTION1(PushClip, const Path *, aPath)
  FORWARD_FUNCTION1(PushClipRect, const Rect &, aRect)
  FORWARD_FUNCTION(PopClip)
  FORWARD_FUNCTION(PopLayer)

  virtual void SetTransform(const Matrix &aTransform) override {
    mTransform = aTransform;
    mA->SetTransform(aTransform);
    mB->SetTransform(aTransform);
  }

  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 Color &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 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();
  }

 private:
  RefPtr<DrawTarget> mA;
  RefPtr<DrawTarget> mB;
};

}  // namespace gfx
}  // namespace mozilla

#endif /* MOZILLA_GFX_DRAWTARGETDUAL_H_ */