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 "include/core/SkTileMode.h" 12 #include "src/shaders/SkShaderBase.h" 13 #include <atomic> 14 15 class SkArenaAlloc; 16 class SkBitmap; 17 class SkPicture; 18 19 /* 20 * An SkPictureShader can be used to draw SkPicture-based patterns. 21 * 22 * The SkPicture is first rendered into a tile, which is then used to shade the area according 23 * to specified tiling rules. 24 */ 25 class SkPictureShader : public SkShaderBase { 26 public: 27 static sk_sp<SkShader> Make(sk_sp<SkPicture>, SkTileMode, SkTileMode, SkFilterMode, 28 const SkMatrix*, const SkRect*); 29 30 #if SK_SUPPORT_GPU 31 std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const GrFPArgs&) const override; 32 #endif 33 34 protected: 35 SkPictureShader(SkReadBuffer&); 36 void flatten(SkWriteBuffer&) const override; 37 bool onAppendStages(const SkStageRec&) const override; 38 skvm::Color onProgram(skvm::Builder*, skvm::Coord device, skvm::Coord local, skvm::Color paint, 39 const SkMatrixProvider&, const SkMatrix* localM, const SkColorInfo& dst, 40 skvm::Uniforms* uniforms, SkArenaAlloc* alloc) const override; 41 42 #ifdef SK_ENABLE_LEGACY_SHADERCONTEXT 43 Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override; 44 #endif 45 46 private: 47 SK_FLATTENABLE_HOOKS(SkPictureShader) 48 49 SkPictureShader(sk_sp<SkPicture>, SkTileMode, SkTileMode, SkFilterMode, 50 const SkMatrix*, const SkRect*); 51 52 sk_sp<SkShader> rasterShader(const SkMatrix&, SkTCopyOnFirstWrite<SkMatrix>* localMatrix, 53 SkColorType dstColorType, SkColorSpace* dstColorSpace) const; 54 55 class PictureShaderContext : public Context { 56 public: 57 PictureShaderContext( 58 const SkPictureShader&, const ContextRec&, sk_sp<SkShader> bitmapShader, SkArenaAlloc*); 59 60 uint32_t getFlags() const override; 61 62 void shadeSpan(int x, int y, SkPMColor dstC[], int count) override; 63 64 sk_sp<SkShader> fBitmapShader; 65 SkShaderBase::Context* fBitmapShaderContext; 66 void* fBitmapShaderContextStorage; 67 68 using INHERITED = Context; 69 }; 70 71 sk_sp<SkPicture> fPicture; 72 SkRect fTile; 73 SkTileMode fTmx, fTmy; 74 SkFilterMode fFilter; 75 76 using INHERITED = SkShaderBase; 77 }; 78 79 #endif // SkPictureShader_DEFINED 80