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| 1 /* |
| 2 * Copyright 2015 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 GrExtractAlphaFragmentProcessor_DEFINED |
| 9 #define GrExtractAlphaFragmentProcessor_DEFINED |
| 10 |
| 11 #include "GrFragmentProcessor.h" |
| 12 |
| 13 /** This processor extracts the incoming color's alpha, ignores r, g, and b, and
feeds |
| 14 the replicated alpha to it's inner processor. */ |
| 15 class GrExtractAlphaFragmentProcessor : public GrFragmentProcessor { |
| 16 public: |
| 17 static GrFragmentProcessor* Create(const GrFragmentProcessor* processor) { |
| 18 if (!processor) { |
| 19 return nullptr; |
| 20 } |
| 21 return SkNEW_ARGS(GrExtractAlphaFragmentProcessor, (processor)); |
| 22 } |
| 23 |
| 24 ~GrExtractAlphaFragmentProcessor() override {} |
| 25 |
| 26 const char* name() const override { return "Extract Alpha"; } |
| 27 |
| 28 private: |
| 29 GrExtractAlphaFragmentProcessor(const GrFragmentProcessor* processor) { |
| 30 this->initClassID<GrExtractAlphaFragmentProcessor>(); |
| 31 this->registerChildProcessor(processor); |
| 32 } |
| 33 |
| 34 GrGLFragmentProcessor* onCreateGLInstance() const override; |
| 35 |
| 36 void onGetGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const ov
erride; |
| 37 |
| 38 bool onIsEqual(const GrFragmentProcessor&) const override; |
| 39 |
| 40 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; |
| 41 |
| 42 typedef GrFragmentProcessor INHERITED; |
| 43 }; |
| 44 |
| 45 #endif |
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