| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkGaussianEdgeShader.h" |
| #include "SkReadBuffer.h" |
| #include "SkWriteBuffer.h" |
| |
| class SkArenaAlloc; |
| |
| /** \class SkGaussianEdgeShaderImpl |
| This subclass of shader applies a Gaussian to shadow edge |
| |
| If the primitive supports an implicit distance to the edge, the radius of the blur is specified |
| by r & g values of the color in 14.2 fixed point. For spot shadows, we increase the stroke width |
| to set the shadow against the shape. This pad is specified by b, also in 6.2 fixed point. |
| |
| When not using implicit distance, then b in the input color represents the input to the |
| blur function. |
| */ |
| class SkGaussianEdgeShaderImpl : public SkShader { |
| public: |
| SkGaussianEdgeShaderImpl() {} |
| |
| bool isOpaque() const override; |
| |
| #if SK_SUPPORT_GPU |
| sk_sp<GrFragmentProcessor> asFragmentProcessor(const AsFPArgs&) const override; |
| #endif |
| |
| SK_TO_STRING_OVERRIDE() |
| SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkGaussianEdgeShaderImpl) |
| |
| protected: |
| void flatten(SkWriteBuffer&) const override; |
| Context* onMakeContext(const ContextRec& rec, SkArenaAlloc* storage) const override { |
| return nullptr; |
| } |
| private: |
| friend class SkGaussianEdgeShader; |
| |
| typedef SkShader INHERITED; |
| }; |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| #if SK_SUPPORT_GPU |
| |
| #include "effects/GrBlurredEdgeFragmentProcessor.h" |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<GrFragmentProcessor> SkGaussianEdgeShaderImpl::asFragmentProcessor(const AsFPArgs&) const { |
| return GrBlurredEdgeFP::Make(GrBlurredEdgeFP::kGaussian_Mode); |
| } |
| |
| #endif |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| bool SkGaussianEdgeShaderImpl::isOpaque() const { |
| return false; |
| } |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| #ifndef SK_IGNORE_TO_STRING |
| void SkGaussianEdgeShaderImpl::toString(SkString* str) const { |
| str->appendf("GaussianEdgeShader: ()"); |
| } |
| #endif |
| |
| sk_sp<SkFlattenable> SkGaussianEdgeShaderImpl::CreateProc(SkReadBuffer& buf) { |
| return sk_make_sp<SkGaussianEdgeShaderImpl>(); |
| } |
| |
| void SkGaussianEdgeShaderImpl::flatten(SkWriteBuffer& buf) const { |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkShader> SkGaussianEdgeShader::Make() { |
| return sk_make_sp<SkGaussianEdgeShaderImpl>(); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkGaussianEdgeShader) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkGaussianEdgeShaderImpl) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END |
| |
| /////////////////////////////////////////////////////////////////////////////// |