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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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