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| 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 SkComposeShader_DEFINED | |
| 11 #define SkComposeShader_DEFINED | |
| 12 | |
| 13 #include "SkShader.h" | |
| 14 | |
| 15 class SkXfermode; | |
| 16 | |
| 17 ////////////////////////////////////////////////////////////////////////////////
/////////// | |
| 18 | |
| 19 /** \class SkComposeShader | |
| 20 This subclass of shader returns the composition of two other shaders, combin
ed by | |
| 21 a xfermode. | |
| 22 */ | |
| 23 class SK_API SkComposeShader : public SkShader { | |
| 24 public: | |
| 25 /** Create a new compose shader, given shaders A, B, and a combining xfermod
e mode. | |
| 26 When the xfermode is called, it will be given the result from shader A a
s its | |
| 27 "dst", and the result from shader B as its "src". | |
| 28 mode->xfer32(sA_result, sB_result, ...) | |
| 29 @param shaderA The colors from this shader are seen as the "dst" by the
xfermode | |
| 30 @param shaderB The colors from this shader are seen as the "src" by the
xfermode | |
| 31 @param mode The xfermode that combines the colors from the two shade
rs. If mode | |
| 32 is null, then SRC_OVER is assumed. | |
| 33 */ | |
| 34 SkComposeShader(SkShader* sA, SkShader* sB, SkXfermode* mode = NULL); | |
| 35 virtual ~SkComposeShader(); | |
| 36 | |
| 37 size_t contextSize() const override; | |
| 38 | |
| 39 #if SK_SUPPORT_GPU | |
| 40 const GrFragmentProcessor* asFragmentProcessor(GrContext*, | |
| 41 const SkMatrix& viewM, | |
| 42 const SkMatrix* localMatrix, | |
| 43 SkFilterQuality) const overr
ide; | |
| 44 #endif | |
| 45 | |
| 46 class ComposeShaderContext : public SkShader::Context { | |
| 47 public: | |
| 48 // When this object gets destroyed, it will call contextA and contextB's
destructor | |
| 49 // but it will NOT free the memory. | |
| 50 ComposeShaderContext(const SkComposeShader&, const ContextRec&, | |
| 51 SkShader::Context* contextA, SkShader::Context* con
textB); | |
| 52 | |
| 53 SkShader::Context* getShaderContextA() const { return fShaderContextA; } | |
| 54 SkShader::Context* getShaderContextB() const { return fShaderContextB; } | |
| 55 | |
| 56 virtual ~ComposeShaderContext(); | |
| 57 | |
| 58 void shadeSpan(int x, int y, SkPMColor[], int count) override; | |
| 59 | |
| 60 private: | |
| 61 SkShader::Context* fShaderContextA; | |
| 62 SkShader::Context* fShaderContextB; | |
| 63 | |
| 64 typedef SkShader::Context INHERITED; | |
| 65 }; | |
| 66 | |
| 67 #ifdef SK_DEBUG | |
| 68 SkShader* getShaderA() { return fShaderA; } | |
| 69 SkShader* getShaderB() { return fShaderB; } | |
| 70 #endif | |
| 71 | |
| 72 bool asACompose(ComposeRec* rec) const override; | |
| 73 | |
| 74 SK_TO_STRING_OVERRIDE() | |
| 75 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeShader) | |
| 76 | |
| 77 protected: | |
| 78 SkComposeShader(SkReadBuffer& ); | |
| 79 void flatten(SkWriteBuffer&) const override; | |
| 80 Context* onCreateContext(const ContextRec&, void*) const override; | |
| 81 | |
| 82 private: | |
| 83 SkShader* fShaderA; | |
| 84 SkShader* fShaderB; | |
| 85 SkXfermode* fMode; | |
| 86 | |
| 87 typedef SkShader INHERITED; | |
| 88 }; | |
| 89 | |
| 90 #endif | |
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Chromium Code Reviews
Issue 1697523003:
make SkComposeShader.h private (Closed)
Base URL: https://skia.googlesource.com/skia.git@master