| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkLumaColorFilter_DEFINED |
| #define SkLumaColorFilter_DEFINED |
| |
| #include "SkColorFilter.h" |
| #include "SkRefCnt.h" |
| |
| class SkRasterPipeline; |
| |
| /** |
| * Luminance-to-alpha color filter, as defined in |
| * http://www.w3.org/TR/SVG/masking.html#Masking |
| * http://www.w3.org/TR/css-masking/#MaskValues |
| * |
| * The resulting color is black with transparency equal to the |
| * luminance value modulated by alpha: |
| * |
| * C' = [ Lum * a, 0, 0, 0 ] |
| * |
| */ |
| class SK_API SkLumaColorFilter : public SkColorFilter { |
| public: |
| static sk_sp<SkColorFilter> Make(); |
| |
| #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: |
| SkLumaColorFilter(); |
| void onAppendStages(SkRasterPipeline*, SkColorSpace*, SkArenaAlloc*, |
| bool shaderIsOpaque) const override; |
| |
| typedef SkColorFilter INHERITED; |
| }; |
| |
| #endif |