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| 1 /* | |
| 2 * Copyright 2013 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 SkLumaXfermode_DEFINED | |
| 9 #define SkLumaXfermode_DEFINED | |
| 10 | |
| 11 #include "SkXfermode.h" | |
| 12 | |
| 13 /** | |
| 14 * Luminance mask transfer, as defined in | |
| 15 * http://www.w3.org/TR/SVG/masking.html#Masking | |
| 16 * http://www.w3.org/TR/css-masking/#MaskValues | |
| 17 * | |
| 18 * The luminance-to-alpha function is applied before performing a standard | |
| 19 * SrcIn/DstIn/SrcOver xfer: | |
| 20 * | |
| 21 * luma(C) = (0.2125 * C.r + 0.7154 * C.g + 0.0721 * C.b) * C.a | |
| 22 * | |
| 23 * (where C is un-premultiplied) | |
| 24 */ | |
| 25 class SK_API SkLumaMaskXfermode : public SkXfermode { | |
| 26 public: | |
| 27 /** Return an SkLumaMaskXfermode object for the specified submode. | |
| 28 * | |
| 29 * Only kSrcIn_Mode, kDstIn_Mode kSrcOver_Mode are supported - for everythi
ng else, | |
| 30 * the factory returns NULL. | |
| 31 */ | |
| 32 static SkXfermode* Create(SkXfermode::Mode); | |
| 33 | |
| 34 virtual SkPMColor xferColor(SkPMColor, SkPMColor) const SK_OVERRIDE; | |
| 35 virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count, | |
| 36 const SkAlpha aa[]) const SK_OVERRIDE; | |
| 37 | |
| 38 SK_DEVELOPER_TO_STRING() | |
| 39 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLumaMaskXfermode) | |
| 40 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() | |
| 41 | |
| 42 #if SK_SUPPORT_GPU | |
| 43 virtual bool asNewEffectOrCoeff(GrContext*, GrEffectRef**, Coeff*, Coeff*, | |
| 44 GrTexture*) const SK_OVERRIDE; | |
| 45 #endif | |
| 46 | |
| 47 protected: | |
| 48 SkLumaMaskXfermode(SkFlattenableReadBuffer&); | |
| 49 virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE; | |
| 50 | |
| 51 SkLumaMaskXfermode(SkXfermode::Mode); | |
| 52 | |
| 53 private: | |
| 54 const SkXfermode::Mode fMode; | |
| 55 | |
| 56 typedef SkXfermode INHERITED; | |
| 57 | |
| 58 virtual SkPMColor lumaProc(const SkPMColor a, const SkPMColor b) const; | |
| 59 }; | |
| 60 | |
| 61 #endif | |
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