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1 /* | 1 /* |
2 * Copyright 2013 Google Inc. | 2 * Copyright 2013 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkLumaXfermode_DEFINED | 8 #ifndef SkLumaXfermode_DEFINED |
9 #define SkLumaXfermode_DEFINED | 9 #define SkLumaXfermode_DEFINED |
10 | 10 |
11 #include "SkXfermode.h" | 11 #include "SkXfermode.h" |
12 | 12 |
13 /** | 13 /** |
14 * Luminance mask transfer, as defined in | 14 * Luminance mask transfer, as defined in |
15 * http://www.w3.org/TR/SVG/masking.html#Masking | 15 * http://www.w3.org/TR/SVG/masking.html#Masking |
16 * http://www.w3.org/TR/css-masking/#MaskValues | 16 * http://www.w3.org/TR/css-masking/#MaskValues |
17 * | 17 * |
18 * The luminance-to-alpha function is applied before performing a standard | 18 * The luminance-to-alpha function is applied before performing a standard |
19 * SrcIn/DstIn xfer: | 19 * SrcIn/DstIn/SrcOver xfer: |
20 * | 20 * |
21 * luma(C) = (0.2125 * C.r + 0.7154 * C.g + 0.0721 * C.b) * C.a | 21 * luma(C) = (0.2125 * C.r + 0.7154 * C.g + 0.0721 * C.b) * C.a |
22 * | 22 * |
23 * (where C is un-premultiplied) | 23 * (where C is un-premultiplied) |
24 */ | 24 */ |
25 class SK_API SkLumaMaskXfermode : public SkXfermode { | 25 class SK_API SkLumaMaskXfermode : public SkXfermode { |
26 public: | 26 public: |
27 /** Return an SkLumaMaskXfermode object for the specified submode. | 27 /** Return an SkLumaMaskXfermode object for the specified submode. |
28 * | 28 * |
29 * Only kSrcIn_Mode and kDstIn_Mode are supported - for everything else, | 29 * Only kSrcIn_Mode, kDstIn_Mode kSrcOver_Mode are supported - for everythi
ng else, |
30 * the factory returns NULL. | 30 * the factory returns NULL. |
31 */ | 31 */ |
32 static SkXfermode* Create(SkXfermode::Mode); | 32 static SkXfermode* Create(SkXfermode::Mode); |
33 | 33 |
34 virtual SkPMColor xferColor(SkPMColor, SkPMColor) const SK_OVERRIDE; | 34 virtual SkPMColor xferColor(SkPMColor, SkPMColor) const SK_OVERRIDE; |
35 virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count, | 35 virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count, |
36 const SkAlpha aa[]) const SK_OVERRIDE; | 36 const SkAlpha aa[]) const SK_OVERRIDE; |
37 | 37 |
38 SK_DEVELOPER_TO_STRING() | 38 SK_DEVELOPER_TO_STRING() |
39 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLumaMaskXfermode) | 39 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLumaMaskXfermode) |
| 40 SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP() |
40 | 41 |
41 #if SK_SUPPORT_GPU | 42 #if SK_SUPPORT_GPU |
42 virtual bool asNewEffectOrCoeff(GrContext*, GrEffectRef**, Coeff*, Coeff*, | 43 virtual bool asNewEffectOrCoeff(GrContext*, GrEffectRef**, Coeff*, Coeff*, |
43 GrTexture*) const SK_OVERRIDE; | 44 GrTexture*) const SK_OVERRIDE; |
44 #endif | 45 #endif |
45 | 46 |
46 protected: | 47 protected: |
47 SkLumaMaskXfermode(SkFlattenableReadBuffer&); | 48 SkLumaMaskXfermode(SkFlattenableReadBuffer&); |
48 virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE; | 49 virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE; |
49 | 50 |
50 private: | |
51 SkLumaMaskXfermode(SkXfermode::Mode); | 51 SkLumaMaskXfermode(SkXfermode::Mode); |
52 | 52 |
| 53 private: |
53 const SkXfermode::Mode fMode; | 54 const SkXfermode::Mode fMode; |
54 | 55 |
55 typedef SkXfermode INHERITED; | 56 typedef SkXfermode INHERITED; |
| 57 |
| 58 virtual SkPMColor lumaProc(const SkPMColor a, const SkPMColor b) const; |
56 }; | 59 }; |
57 | 60 |
58 #endif | 61 #endif |
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