| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkComposeShader_DEFINED |
| #define SkComposeShader_DEFINED |
| |
| #include "SkShaderBase.h" |
| #include "SkBlendMode.h" |
| |
| class SkColorSpacXformer; |
| |
| /////////////////////////////////////////////////////////////////////////////////////////// |
| |
| /** \class SkComposeShader |
| This subclass of shader returns the composition of two other shaders, combined by |
| a xfermode. |
| */ |
| class SK_API SkComposeShader : public SkShaderBase { |
| public: |
| /** Create a new compose shader, given shaders A, B, and a combining xfermode mode. |
| When the xfermode is called, it will be given the result from shader A as its |
| "dst", and the result from shader B as its "src". |
| mode->xfer32(sA_result, sB_result, ...) |
| @param shaderA The colors from this shader are seen as the "dst" by the xfermode |
| @param shaderB The colors from this shader are seen as the "src" by the xfermode |
| @param mode The xfermode that combines the colors from the two shaders. If mode |
| is null, then SRC_OVER is assumed. |
| */ |
| SkComposeShader(sk_sp<SkShader> sA, sk_sp<SkShader> sB, SkBlendMode mode) |
| : fShaderA(std::move(sA)) |
| , fShaderB(std::move(sB)) |
| , fMode(mode) |
| {} |
| |
| #if SK_SUPPORT_GPU |
| sk_sp<GrFragmentProcessor> asFragmentProcessor(const AsFPArgs&) const override; |
| #endif |
| |
| class ComposeShaderContext : public Context { |
| public: |
| // When this object gets destroyed, it will call contextA and contextB's destructor |
| // but it will NOT free the memory. |
| ComposeShaderContext(const SkComposeShader&, const ContextRec&, |
| SkShaderBase::Context* contextA, SkShaderBase::Context* contextB); |
| |
| void shadeSpan(int x, int y, SkPMColor[], int count) override; |
| void shadeSpan4f(int x, int y, SkPM4f[], int count) override; |
| |
| private: |
| SkShaderBase::Context* fShaderContextA; |
| SkShaderBase::Context* fShaderContextB; |
| |
| typedef Context INHERITED; |
| }; |
| |
| #ifdef SK_DEBUG |
| SkShader* getShaderA() { return fShaderA.get(); } |
| SkShader* getShaderB() { return fShaderB.get(); } |
| #endif |
| |
| bool asACompose(ComposeRec* rec) const override; |
| |
| SK_TO_STRING_OVERRIDE() |
| SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkComposeShader) |
| |
| protected: |
| SkComposeShader(SkReadBuffer&); |
| void flatten(SkWriteBuffer&) const override; |
| Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override; |
| sk_sp<SkShader> onMakeColorSpace(SkColorSpaceXformer* xformer) const override; |
| bool onAppendStages(SkRasterPipeline*, SkColorSpace* dstCS, SkArenaAlloc*, |
| const SkMatrix&, const SkPaint&, const SkMatrix* localM) const override; |
| |
| bool isRasterPipelineOnly() const final; |
| |
| private: |
| sk_sp<SkShader> fShaderA; |
| sk_sp<SkShader> fShaderB; |
| SkBlendMode fMode; |
| |
| typedef SkShaderBase INHERITED; |
| }; |
| |
| #endif |