1 /* 2 * Copyright 2014 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkPictureShader_DEFINED 9 #define SkPictureShader_DEFINED 10 11 #include "SkShaderBase.h" 12 #include <atomic> 13 14 class SkArenaAlloc; 15 class SkBitmap; 16 class SkPicture; 17 18 /* 19 * An SkPictureShader can be used to draw SkPicture-based patterns. 20 * 21 * The SkPicture is first rendered into a tile, which is then used to shade the area according 22 * to specified tiling rules. 23 */ 24 class SkPictureShader : public SkShaderBase { 25 public: 26 ~SkPictureShader() override; 27 28 static sk_sp<SkShader> Make(sk_sp<SkPicture>, TileMode, TileMode, const SkMatrix*, 29 const SkRect*); 30 31 #if SK_SUPPORT_GPU 32 std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const GrFPArgs&) const override; 33 #endif 34 35 protected: 36 SkPictureShader(SkReadBuffer&); 37 void flatten(SkWriteBuffer&) const override; 38 bool onAppendStages(const StageRec&) const override; 39 #ifdef SK_ENABLE_LEGACY_SHADERCONTEXT 40 Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override; 41 #endif 42 sk_sp<SkShader> onMakeColorSpace(SkColorSpaceXformer* xformer) const override; 43 44 private: 45 SK_FLATTENABLE_HOOKS(SkPictureShader) 46 47 SkPictureShader(sk_sp<SkPicture>, TileMode, TileMode, const SkMatrix*, const SkRect*, 48 sk_sp<SkColorSpace>); 49 50 sk_sp<SkShader> refBitmapShader(const SkMatrix&, SkTCopyOnFirstWrite<SkMatrix>* localMatrix, 51 SkColorType dstColorType, SkColorSpace* dstColorSpace, 52 const int maxTextureSize = 0) const; 53 54 class PictureShaderContext : public Context { 55 public: 56 PictureShaderContext( 57 const SkPictureShader&, const ContextRec&, sk_sp<SkShader> bitmapShader, SkArenaAlloc*); 58 59 uint32_t getFlags() const override; 60 61 void shadeSpan(int x, int y, SkPMColor dstC[], int count) override; 62 63 sk_sp<SkShader> fBitmapShader; 64 SkShaderBase::Context* fBitmapShaderContext; 65 void* fBitmapShaderContextStorage; 66 67 typedef Context INHERITED; 68 }; 69 70 sk_sp<SkPicture> fPicture; 71 SkRect fTile; 72 TileMode fTmx, fTmy; 73 74 // Should never be set by a public constructor. This is only used when onMakeColorSpace() 75 // forces a deferred color space xform. 76 sk_sp<SkColorSpace> fColorSpace; 77 78 const uint32_t fUniqueID; 79 mutable std::atomic<bool> fAddedToCache; 80 81 typedef SkShaderBase INHERITED; 82 }; 83 84 #endif // SkPictureShader_DEFINED 85
