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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 or DstIn xfer: | |
reed1
2013/08/22 18:35:51
Is this list (srcin, dstin) complete, or just e.g.
f(malita)
2013/08/22 19:25:52
It is complete with regard to SVG/CSS masking supp
| |
20 * | |
21 * luma(C) = (0.2125 * C.r + 0.7154 * C.g + 0.0721 * C.b) * C.a | |
reed1
2013/08/22 18:35:51
Can you document what happens to the resulting r,g
f(malita)
2013/08/22 19:25:52
Will do.
| |
22 * | |
23 * The only supported submodes are SrcIn and DstIn. | |
24 */ | |
25 class SK_API SkLumaMaskXfermode : public SkXfermode { | |
26 public: | |
27 static SkXfermode* Create(SkXfermode::Mode); | |
reed1
2013/08/22 18:35:51
Should you support another Create that takes SkXfe
f(malita)
2013/08/22 19:25:52
This ties into the decision to support arbitrary t
| |
28 | |
29 virtual SkPMColor xferColor(SkPMColor, SkPMColor) const SK_OVERRIDE; | |
30 virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count, | |
31 const SkAlpha aa[]) const SK_OVERRIDE; | |
32 | |
33 SK_DEVELOPER_TO_STRING() | |
34 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLumaMaskXfermode) | |
35 | |
36 #if SK_SUPPORT_GPU | |
37 virtual bool asNewEffectOrCoeff(GrContext*, GrEffectRef**, Coeff*, Coeff*, | |
38 GrTexture*) const SK_OVERRIDE; | |
39 #endif | |
40 | |
41 protected: | |
42 SkLumaMaskXfermode(SkFlattenableReadBuffer&); | |
43 virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE; | |
44 | |
45 private: | |
46 SkLumaMaskXfermode(SkXfermode::Mode); | |
47 | |
48 const SkXfermode::Mode fMode; | |
49 | |
50 typedef SkXfermode INHERITED; | |
51 }; | |
52 | |
53 #endif | |
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