SkBitmapProcShader.h revision ce56d965069c1649afe14319cb239e6ad670682a
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 SkBitmapProcShader_DEFINED 11#define SkBitmapProcShader_DEFINED 12 13#include "SkShader.h" 14#include "SkBitmapProcState.h" 15#include "SkSmallAllocator.h" 16 17class SkBitmapProcShader : public SkShader { 18public: 19 SkBitmapProcShader(const SkBitmap& src, TileMode tx, TileMode ty, 20 const SkMatrix* localMatrix = NULL); 21 22 // overrides from SkShader 23 virtual bool isOpaque() const SK_OVERRIDE; 24 virtual BitmapType asABitmap(SkBitmap*, SkMatrix*, TileMode*) const SK_OVERRIDE; 25 26 virtual size_t contextSize() const SK_OVERRIDE; 27 28 static bool CanDo(const SkBitmap&, TileMode tx, TileMode ty); 29 30 SK_TO_STRING_OVERRIDE() 31 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBitmapProcShader) 32 33#if SK_SUPPORT_GPU 34 GrEffectRef* asNewEffect(GrContext*, const SkPaint&) const SK_OVERRIDE; 35#endif 36 37 class BitmapProcShaderContext : public SkShader::Context { 38 public: 39 // The context takes ownership of the state. It will call its destructor 40 // but will NOT free the memory. 41 BitmapProcShaderContext(const SkBitmapProcShader&, const ContextRec&, SkBitmapProcState*); 42 virtual ~BitmapProcShaderContext(); 43 44 virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE; 45 virtual ShadeProc asAShadeProc(void** ctx) SK_OVERRIDE; 46 virtual void shadeSpan16(int x, int y, uint16_t dstC[], int count) SK_OVERRIDE; 47 48 virtual uint32_t getFlags() const SK_OVERRIDE { return fFlags; } 49 50 private: 51 SkBitmapProcState* fState; 52 uint32_t fFlags; 53 54 typedef SkShader::Context INHERITED; 55 }; 56 57protected: 58 SkBitmapProcShader(SkReadBuffer& ); 59 virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE; 60 virtual Context* onCreateContext(const ContextRec&, void* storage) const SK_OVERRIDE; 61 62 SkBitmap fRawBitmap; // experimental for RLE encoding 63 uint8_t fTileModeX, fTileModeY; 64 65private: 66 typedef SkShader INHERITED; 67}; 68 69// Commonly used allocator. It currently is only used to allocate up to 3 objects. The total 70// bytes requested is calculated using one of our large shaders, its context size plus the size of 71// an Sk3DBlitter in SkDraw.cpp 72// Note that some contexts may contain other contexts (e.g. for compose shaders), but we've not 73// yet found a situation where the size below isn't big enough. 74typedef SkSmallAllocator<3, sizeof(SkBitmapProcShader) + 75 sizeof(SkBitmapProcShader::BitmapProcShaderContext) + 76 sizeof(SkBitmapProcState) + 77 sizeof(void*) * 2> SkTBlitterAllocator; 78 79// If alloc is non-NULL, it will be used to allocate the returned SkShader, and MUST outlive 80// the SkShader. 81SkShader* CreateBitmapShader(const SkBitmap& src, SkShader::TileMode, SkShader::TileMode, 82 const SkMatrix* localMatrix, SkTBlitterAllocator* alloc); 83 84#endif 85