michael@0: 
michael@0: /*
michael@0:  * Copyright 2006 The Android Open Source Project
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #ifndef SkLayerRasterizer_DEFINED
michael@0: #define SkLayerRasterizer_DEFINED
michael@0: 
michael@0: #include "SkRasterizer.h"
michael@0: #include "SkDeque.h"
michael@0: #include "SkScalar.h"
michael@0: 
michael@0: class SkPaint;
michael@0: 
michael@0: class SK_API SkLayerRasterizer : public SkRasterizer {
michael@0: public:
michael@0:     virtual ~SkLayerRasterizer();
michael@0: 
michael@0:     class SK_API Builder {
michael@0:     public:
michael@0:         Builder();
michael@0:         ~Builder();
michael@0: 
michael@0:         void addLayer(const SkPaint& paint) {
michael@0:             this->addLayer(paint, 0, 0);
michael@0:         }
michael@0: 
michael@0:         /**
michael@0:           *  Add a new layer (above any previous layers) to the rasterizer.
michael@0:           *  The layer will extract those fields that affect the mask from
michael@0:           *  the specified paint, but will not retain a reference to the paint
michael@0:           *  object itself, so it may be reused without danger of side-effects.
michael@0:           */
michael@0:         void addLayer(const SkPaint& paint, SkScalar dx, SkScalar dy);
michael@0: 
michael@0:         /**
michael@0:           *  Pass queue of layers on to newly created layer rasterizer and return it. The builder
michael@0:           *  cannot be used any more after calling this function.
michael@0:           */
michael@0:         SkLayerRasterizer* detachRasterizer();
michael@0: 
michael@0:     private:
michael@0:         SkDeque* fLayers;
michael@0:     };
michael@0: 
michael@0: #ifdef SK_SUPPORT_LEGACY_LAYERRASTERIZER_API
michael@0:     void addLayer(const SkPaint& paint) {
michael@0:         this->addLayer(paint, 0, 0);
michael@0:     }
michael@0: 
michael@0:     /**    Add a new layer (above any previous layers) to the rasterizer.
michael@0:         The layer will extract those fields that affect the mask from
michael@0:         the specified paint, but will not retain a reference to the paint
michael@0:         object itself, so it may be reused without danger of side-effects.
michael@0:     */
michael@0:     void addLayer(const SkPaint& paint, SkScalar dx, SkScalar dy);
michael@0: #endif
michael@0: 
michael@0:     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLayerRasterizer)
michael@0: 
michael@0: protected:
michael@0:     SkLayerRasterizer(SkDeque* layers);
michael@0:     SkLayerRasterizer(SkReadBuffer&);
michael@0:     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
michael@0: 
michael@0:     // override from SkRasterizer
michael@0:     virtual bool onRasterize(const SkPath& path, const SkMatrix& matrix,
michael@0:                              const SkIRect* clipBounds,
michael@0:                              SkMask* mask, SkMask::CreateMode mode) const;
michael@0: 
michael@0: #ifdef SK_SUPPORT_LEGACY_LAYERRASTERIZER_API
michael@0: public:
michael@0: #endif
michael@0:     SkLayerRasterizer();
michael@0: 
michael@0: private:
michael@0: #ifdef SK_SUPPORT_LEGACY_LAYERRASTERIZER_API
michael@0:     SkDeque* fLayers;
michael@0: #else
michael@0:     const SkDeque* const fLayers;
michael@0: #endif
michael@0: 
michael@0:     static SkDeque* ReadLayers(SkReadBuffer& buffer);
michael@0: 
michael@0:     typedef SkRasterizer INHERITED;
michael@0: };
michael@0: 
michael@0: #endif