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      1 /*
      2  * Copyright 2016 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 GrSRGBEffect_DEFINED
      9 #define GrSRGBEffect_DEFINED
     10 
     11 #include "GrFragmentProcessor.h"
     12 
     13 class GrSRGBEffect : public GrFragmentProcessor {
     14 public:
     15     enum class Mode {
     16         kLinearToSRGB,
     17         kSRGBToLinear,
     18     };
     19 
     20     /**
     21      * Creates an effect that applies the sRGB transfer function (or its inverse)
     22      */
     23     static sk_sp<GrFragmentProcessor> Make(Mode mode);
     24 
     25     const char* name() const override { return "sRGB"; }
     26 
     27     Mode mode() const { return fMode; }
     28 
     29 private:
     30     GrSRGBEffect(Mode mode);
     31 
     32     GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
     33     void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
     34     bool onIsEqual(const GrFragmentProcessor&) const override;
     35 
     36     GrColor4f constantOutputForConstantInput(GrColor4f input) const override;
     37 
     38     Mode fMode;
     39 
     40     GR_DECLARE_FRAGMENT_PROCESSOR_TEST;
     41 
     42     typedef GrFragmentProcessor INHERITED;
     43 };
     44 
     45 #endif
     46