SkLayerRasterizer.h revision ec3ed6a5ebf6f2c406d7bcf94b6bc34fcaeb976e
1 2/* 3 * Copyright 2006 The Android Open Source Project 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10#ifndef SkLayerRasterizer_DEFINED 11#define SkLayerRasterizer_DEFINED 12 13#include "SkRasterizer.h" 14#include "SkDeque.h" 15#include "SkScalar.h" 16 17class SkPaint; 18 19class SkLayerRasterizer : public SkRasterizer { 20public: 21 SkLayerRasterizer(); 22 virtual ~SkLayerRasterizer(); 23 24 void addLayer(const SkPaint& paint) { 25 this->addLayer(paint, 0, 0); 26 } 27 28 /** Add a new layer (above any previous layers) to the rasterizer. 29 The layer will extract those fields that affect the mask from 30 the specified paint, but will not retain a reference to the paint 31 object itself, so it may be reused without danger of side-effects. 32 */ 33 void addLayer(const SkPaint& paint, SkScalar dx, SkScalar dy); 34 35 // overrides from SkFlattenable 36 virtual Factory getFactory(); 37 virtual void flatten(SkFlattenableWriteBuffer&); 38 39protected: 40 SkLayerRasterizer(SkFlattenableReadBuffer&); 41 42 // override from SkRasterizer 43 virtual bool onRasterize(const SkPath& path, const SkMatrix& matrix, 44 const SkIRect* clipBounds, 45 SkMask* mask, SkMask::CreateMode mode); 46 47private: 48 SkDeque fLayers; 49 50 static SkFlattenable* CreateProc(SkFlattenableReadBuffer&); 51 52 typedef SkRasterizer INHERITED; 53}; 54 55#endif 56