| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkGammaColorFilter_DEFINED |
| #define SkGammaColorFilter_DEFINED |
| |
| #include "SkColorFilter.h" |
| #include "SkRefCnt.h" |
| |
| // This colorfilter can be used to perform pixel-by-pixel conversion between linear and |
| // power-law color spaces. A gamma of 2.2 is interpreted to mean convert from sRGB to linear |
| // while a gamma of 1/2.2 is interpreted to mean convert from linear to sRGB. Any other |
| // values are just directly applied (i.e., out = in^gamma) |
| // |
| // More complicated color space mapping (i.e., ICC profiles) should be handled via the |
| // SkColorSpace object. |
| class SK_API SkGammaColorFilter : public SkColorFilter { |
| public: |
| static sk_sp<SkColorFilter> Make(SkScalar gamma); |
| |
| void filterSpan(const SkPMColor src[], int count, SkPMColor[]) const override; |
| |
| #if SK_SUPPORT_GPU |
| sk_sp<GrFragmentProcessor> asFragmentProcessor(GrContext*, SkColorSpace*) const override; |
| #endif |
| |
| SK_TO_STRING_OVERRIDE() |
| SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLumaColorFilter) |
| |
| protected: |
| void flatten(SkWriteBuffer&) const override; |
| |
| private: |
| SkGammaColorFilter(SkScalar gamma); |
| |
| SkScalar fGamma; |
| typedef SkColorFilter INHERITED; |
| }; |
| |
| #endif |