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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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