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*/
18class SK_API SkPixelXorXfermode : public SkXfermode {
19public:
20    static SkPixelXorXfermode* Create(SkColor opColor) {
21        return SkNEW_ARGS(SkPixelXorXfermode, (opColor));
22    }
23
24    SK_TO_STRING_OVERRIDE()
25    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPixelXorXfermode)
26
27protected:
28    explicit SkPixelXorXfermode(SkColor opColor) : fOpColor(opColor) {}
29#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
30    explicit SkPixelXorXfermode(SkReadBuffer& rb);
31#endif
32    virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
33
34    // override from SkXfermode
35    virtual SkPMColor xferColor(SkPMColor src, SkPMColor dst) const;
36
37private:
38    SkColor fOpColor;
39
40    typedef SkXfermode INHERITED;
41};
42
43#endif
44