SkMergeImageFilter.h revision 4a9a612b5200597cca0bda0a356250835cbdc7d6 
1/*
2 * Copyright 2012 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 SkMergeImageFilter_DEFINED
9#define SkMergeImageFilter_DEFINED
10
11#include "SkImageFilter.h"
12
13#include "SkXfermode.h"
14
15class SK_API SkMergeImageFilter : public SkImageFilter {
16public:
17    SkMergeImageFilter(SkImageFilter* first, SkImageFilter* second,
18                       SkXfermode::Mode = SkXfermode::kSrcOver_Mode);
19    SkMergeImageFilter(SkImageFilter* filters[], int count,
20                       const SkXfermode::Mode modes[] = NULL);
21    virtual ~SkMergeImageFilter();
22
23    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkMergeImageFilter)
24
25protected:
26    SkMergeImageFilter(SkFlattenableReadBuffer& buffer);
27    virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
28
29    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&,
30                               SkBitmap* result, SkIPoint* loc) SK_OVERRIDE;
31    virtual bool onFilterBounds(const SkIRect&, const SkMatrix&, SkIRect*) SK_OVERRIDE;
32
33private:
34    uint8_t*            fModes; // SkXfermode::Mode
35
36    // private storage, to avoid dynamically allocating storage for our copy
37    // of the modes (unless the count is so large we can't fit).
38    intptr_t    fStorage[16];
39
40    void initAllocModes();
41    void initModes(const SkXfermode::Mode []);
42
43    typedef SkImageFilter INHERITED;
44};
45
46#endif
47