SkXfermodeImageFilter.h revision 8b0e8ac5f582de80356019406e2975079bf0829d 
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,
25                          SkImageFilter* foreground = NULL, const CropRect* cropRect = NULL);
26
27    virtual ~SkXfermodeImageFilter();
28
29    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkXfermodeImageFilter)
30
31    virtual bool onFilterImage(Proxy* proxy,
32                               const SkBitmap& src,
33                               const SkMatrix& ctm,
34                               SkBitmap* dst,
35                               SkIPoint* offset) SK_OVERRIDE;
36#if SK_SUPPORT_GPU
37    virtual bool canFilterImageGPU() const SK_OVERRIDE { return !cropRectIsSet(); }
38    virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
39                                SkBitmap* result, SkIPoint* offset) SK_OVERRIDE;
40#endif
41
42protected:
43    explicit SkXfermodeImageFilter(SkReadBuffer& buffer);
44    virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
45
46private:
47    SkXfermode* fMode;
48    typedef SkImageFilter INHERITED;
49};
50
51#endif
52