SkMergeImageFilter.h revision b295fb6ff3222453912dfcb7a1ea5184d40014b5 
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                       const CropRect* cropRect = NULL);
20    SkMergeImageFilter(SkImageFilter* filters[], int count,
21                       const SkXfermode::Mode modes[] = NULL,
22                       const CropRect* cropRect = NULL);
23    virtual ~SkMergeImageFilter();
24
25    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkMergeImageFilter)
26
27protected:
28    SkMergeImageFilter(SkFlattenableReadBuffer& buffer);
29    virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
30
31    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&,
32                               SkBitmap* result, SkIPoint* loc) SK_OVERRIDE;
33    virtual bool onFilterBounds(const SkIRect&, const SkMatrix&, SkIRect*) SK_OVERRIDE;
34
35private:
36    uint8_t*            fModes; // SkXfermode::Mode
37
38    // private storage, to avoid dynamically allocating storage for our copy
39    // of the modes (unless the count is so large we can't fit).
40    intptr_t    fStorage[16];
41
42    void initAllocModes();
43    void initModes(const SkXfermode::Mode []);
44
45    typedef SkImageFilter INHERITED;
46};
47
48#endif
49