SkXfermodeImageFilter.h revision 86fc266eda887920e3dd104bee8121ae19729cf5 
1/*
2 * Copyright 2013 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 SkXfermodeImageFilter_DEFINED
9#define SkXfermodeImageFilter_DEFINED
10
11#include "SkImageFilter.h"
12
13class SkBitmap;
14class SkXfermode;
15
16class SK_API SkXfermodeImageFilter : public SkImageFilter {
17    /**
18     * This filter takes an xfermode, and uses it to composite the foreground
19     * over the background.  If foreground or background is NULL, the input
20     * bitmap (src) is used instead.
21      */
22
23public:
24    SkXfermodeImageFilter(SkXfermode* mode, SkImageFilter* background, SkImageFilter* foreground = NULL);
25
26    virtual ~SkXfermodeImageFilter();
27
28    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkXfermodeImageFilter)
29
30    virtual bool onFilterImage(Proxy* proxy,
31                               const SkBitmap& src,
32                               const SkMatrix& ctm,
33                               SkBitmap* dst,
34                               SkIPoint* offset) SK_OVERRIDE;
35#if SK_SUPPORT_GPU
36    virtual bool canFilterImageGPU() const SK_OVERRIDE { return true; }
37    virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, SkBitmap* result) SK_OVERRIDE;
38#endif
39
40protected:
41    explicit SkXfermodeImageFilter(SkFlattenableReadBuffer& buffer);
42    virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
43
44private:
45    SkXfermode* fMode;
46    typedef SkImageFilter INHERITED;
47};
48
49#endif
50