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1 /* | 1 /* |
2 * Copyright 2016 Google Inc. | 2 * Copyright 2016 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef GrGammaEffect_DEFINED | 8 #ifndef GrGammaEffect_DEFINED |
9 #define GrGammaEffect_DEFINED | 9 #define GrGammaEffect_DEFINED |
10 | 10 |
11 #include "GrSingleTextureEffect.h" | 11 #include "GrFragmentProcessor.h" |
12 | 12 |
13 class GrGammaEffect : public GrSingleTextureEffect { | 13 class GrGammaEffect : public GrFragmentProcessor { |
14 public: | 14 public: |
| 15 enum class Mode { |
| 16 kLinearToSRGB, |
| 17 kSRGBToLinear, |
| 18 kExponential, |
| 19 }; |
| 20 |
15 /** | 21 /** |
16 * Creates an effect that applies a gamma curve. The source texture is alway
s | 22 * Creates an effect that applies a gamma curve. |
17 * sampled unfiltered and with clamping. | 23 */ |
18 */ | 24 static const GrFragmentProcessor* Create(SkScalar gamma); |
19 static const GrFragmentProcessor* Create(GrTexture*, SkScalar gamma); | |
20 | 25 |
21 const char* name() const override { return "Gamma"; } | 26 const char* name() const override { return "Gamma"; } |
22 | 27 |
23 bool gammaIsSRGB() const { return fGammaIsSRGB; } | 28 Mode mode() const { return fMode; } |
24 SkScalar gamma() const { return fGamma; } | 29 SkScalar gamma() const { return fGamma; } |
25 | 30 |
26 private: | 31 private: |
27 GrGammaEffect(GrTexture*, SkScalar gamma); | 32 GrGammaEffect(Mode mode, SkScalar gamma); |
28 | 33 |
29 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; | 34 GrGLSLFragmentProcessor* onCreateGLSLInstance() const override; |
30 void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const
override; | 35 void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const
override; |
31 bool onIsEqual(const GrFragmentProcessor&) const override; | 36 bool onIsEqual(const GrFragmentProcessor&) const override; |
32 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; | 37 void onComputeInvariantOutput(GrInvariantOutput* inout) const override; |
33 | 38 |
34 bool fGammaIsSRGB; | 39 Mode fMode; |
35 SkScalar fGamma; | 40 SkScalar fGamma; |
36 | 41 |
37 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; | 42 GR_DECLARE_FRAGMENT_PROCESSOR_TEST; |
38 | 43 |
39 typedef GrSingleTextureEffect INHERITED; | 44 typedef GrFragmentProcessor INHERITED; |
40 }; | 45 }; |
41 | 46 |
42 #endif | 47 #endif |
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