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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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