SkPixelXorXfermode.h revision b83b6b4f7690fe929d8d6b1a3d2b7ed562b95ba6 
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    SkPixelXorXfermode(SkColor opColor) : fOpColor(opColor) {}
21
22    SK_DEVELOPER_TO_STRING()
23    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPixelXorXfermode)
24
25protected:
26    SkPixelXorXfermode(SkFlattenableReadBuffer& rb);
27    virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
28
29    // override from SkXfermode
30    virtual SkPMColor xferColor(SkPMColor src, SkPMColor dst) const;
31
32private:
33    SkColor fOpColor;
34
35    typedef SkXfermode INHERITED;
36};
37
38#endif
39