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:
Create(SkColor opColor)20     static SkPixelXorXfermode* Create(SkColor opColor) {
21         return SkNEW_ARGS(SkPixelXorXfermode, (opColor));
22     }
23 
24     SK_TO_STRING_OVERRIDE()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPixelXorXfermode)25     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPixelXorXfermode)
26 
27 protected:
28     explicit SkPixelXorXfermode(SkColor opColor) : fOpColor(opColor) {}
29     void flatten(SkWriteBuffer&) const override;
30 
31     // override from SkXfermode
32     SkPMColor xferColor(SkPMColor src, SkPMColor dst) const override;
33 
34 private:
35     SkColor fOpColor;
36 
37     typedef SkXfermode INHERITED;
38 };
39 
40 #endif
41