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1 /* | |
2 * Copyright 2007 The Android Open Source Project | |
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 SkPixelXorXfermode_DEFINED | |
9 #define SkPixelXorXfermode_DEFINED | |
10 | |
11 #include "SkXfermode.h" | |
12 | |
13 /** SkPixelXorXfermode implements a simple pixel xor (op ^ src ^ dst). | |
14 This transformation does not follow premultiplied conventions, therefore | |
15 this proc *always* returns an opaque color (alpha == 255). Thus it is | |
16 not really usefull for operating on blended colors. | |
17 */ | |
18 class SK_API SkPixelXorXfermode : public SkXfermode { | |
19 public: | |
20 static SkXfermode* Create(SkColor opColor) { | |
21 return new SkPixelXorXfermode(opColor); | |
22 } | |
23 | |
24 #if SK_SUPPORT_GPU | |
25 bool asFragmentProcessor(const GrFragmentProcessor** output, | |
26 const GrFragmentProcessor* dst) const override; | |
27 | |
28 bool asXPFactory(GrXPFactory**) const override; | |
29 #endif | |
30 | |
31 SK_TO_STRING_OVERRIDE() | |
32 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPixelXorXfermode) | |
33 | |
34 protected: | |
35 void flatten(SkWriteBuffer&) const override; | |
36 SkPMColor xferColor(SkPMColor src, SkPMColor dst) const override; | |
37 | |
38 private: | |
39 explicit SkPixelXorXfermode(SkColor opColor) { | |
40 fOpColor = SkPreMultiplyColor(opColor | 0xFF000000); | |
41 } | |
42 | |
43 SkPMColor fOpColor; | |
44 | |
45 typedef SkXfermode INHERITED; | |
46 }; | |
47 | |
48 #endif | |
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