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 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-

   * 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() { mA->funcName(); mB->funcName(); }

 #define FORWARD_FUNCTION1(funcName, var1Type, var1Name) \

   virtual void funcName(var1Type var1Name) { 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)

   DrawTargetDual(DrawTarget *aA, DrawTarget *aB)

     : mA(aA)

     , mB(aB)

   { 

     mFormat = aA->GetFormat();

   }

   virtual BackendType GetType() const { return mA->GetType(); }

   virtual TemporaryRef<SourceSurface> Snapshot() { return new SourceSurfaceDual(mA, mB); }

   virtual IntSize GetSize() { return mA->GetSize(); }

   FORWARD_FUNCTION(Flush)

   FORWARD_FUNCTION1(PushClip, const Path *, aPath)

   FORWARD_FUNCTION1(PushClipRect, const Rect &, aRect)

   FORWARD_FUNCTION(PopClip)

   FORWARD_FUNCTION1(ClearRect, const Rect &, aRect)

   virtual void SetTransform(const Matrix &aTransform) {

     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);

   virtual void DrawFilter(FilterNode *aNode,

                           const Rect &aSourceRect,

                           const Point &aDestPoint,

                           const DrawOptions &aOptions = DrawOptions())

   {

     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());

   virtual void DrawSurfaceWithShadow(SourceSurface *aSurface, const Point &aDest,

                                      const Color &aColor, const Point &aOffset,

                                      Float aSigma, CompositionOp aOp);

   virtual void CopySurface(SourceSurface *aSurface, const IntRect &aSourceRect,

                            const IntPoint &aDestination);

   virtual void FillRect(const Rect &aRect, const Pattern &aPattern, const DrawOptions &aOptions);

   virtual void StrokeRect(const Rect &aRect, const Pattern &aPattern,

                           const StrokeOptions &aStrokeOptions, const DrawOptions &aOptions);

   virtual void StrokeLine(const Point &aStart, const Point &aEnd, const Pattern &aPattern,

                           const StrokeOptions &aStrokeOptions, const DrawOptions &aOptions);

   virtual void Stroke(const Path *aPath, const Pattern &aPattern,

                       const StrokeOptions &aStrokeOptions, const DrawOptions &aOptions);

   virtual void Fill(const Path *aPath, const Pattern &aPattern, const DrawOptions &aOptions);

   virtual void FillGlyphs(ScaledFont *aScaledFont, const GlyphBuffer &aBuffer,

                           const Pattern &aPattern, const DrawOptions &aOptions,

                           const GlyphRenderingOptions *aRenderingOptions);

   virtual void Mask(const Pattern &aSource, const Pattern &aMask, const DrawOptions &aOptions);

   virtual TemporaryRef<SourceSurface>

     CreateSourceSurfaceFromData(unsigned char *aData,

                                 const IntSize &aSize,

                                 int32_t aStride,

                                 SurfaceFormat aFormat) const

   {

     return mA->CreateSourceSurfaceFromData(aData, aSize, aStride, aFormat);

   }

   virtual TemporaryRef<SourceSurface> OptimizeSourceSurface(SourceSurface *aSurface) const

   {

     return mA->OptimizeSourceSurface(aSurface);

   }

   virtual TemporaryRef<SourceSurface>

     CreateSourceSurfaceFromNativeSurface(const NativeSurface &aSurface) const

   {

     return mA->CreateSourceSurfaceFromNativeSurface(aSurface);

   }

   virtual TemporaryRef<DrawTarget>

     CreateSimilarDrawTarget(const IntSize &aSize, SurfaceFormat aFormat) const;

   virtual TemporaryRef<PathBuilder> CreatePathBuilder(FillRule aFillRule = FillRule::FILL_WINDING) const

   {

     return mA->CreatePathBuilder(aFillRule);

   }

   virtual TemporaryRef<GradientStops>

     CreateGradientStops(GradientStop *aStops,

                         uint32_t aNumStops,

                         ExtendMode aExtendMode = ExtendMode::CLAMP) const

   {

     return mA->CreateGradientStops(aStops, aNumStops, aExtendMode);

   }

   virtual TemporaryRef<FilterNode> CreateFilter(FilterType aType)

   {

     return mA->CreateFilter(aType);

   }

   virtual void *GetNativeSurface(NativeSurfaceType aType)

   {

     return nullptr;

   }

   virtual bool IsDualDrawTarget()

   {

     return true;

   }

 private:

   RefPtr<DrawTarget> mA;

   RefPtr<DrawTarget> mB;

 };

 }

 }

 #endif /* MOZILLA_GFX_DRAWTARGETDUAL_H_ */