SkMergeImageFilter.h revision 53ba425c91202ef4f78e45f71c330d847a1f8faa 
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    virtual ~SkMergeImageFilter();
18
19    static SkMergeImageFilter* Create(SkImageFilter* first, SkImageFilter* second,
20                                      SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode,
21                                      const CropRect* cropRect = NULL) {
22        return SkNEW_ARGS(SkMergeImageFilter, (first, second, mode, cropRect));
23    }
24    static SkMergeImageFilter* Create(SkImageFilter* filters[], int count,
25                                      const SkXfermode::Mode modes[] = NULL,
26                                      const CropRect* cropRect = NULL) {
27        return SkNEW_ARGS(SkMergeImageFilter, (filters, count, modes, cropRect));
28    }
29
30    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkMergeImageFilter)
31
32protected:
33    SkMergeImageFilter(SkReadBuffer& buffer);
34    virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
35
36    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&,
37                               SkBitmap* result, SkIPoint* loc) const SK_OVERRIDE;
38
39#ifdef SK_SUPPORT_LEGACY_PUBLICEFFECTCONSTRUCTORS
40public:
41#endif
42    SkMergeImageFilter(SkImageFilter* first, SkImageFilter* second,
43                       SkXfermode::Mode = SkXfermode::kSrcOver_Mode,
44                       const CropRect* cropRect = NULL);
45    SkMergeImageFilter(SkImageFilter* filters[], int count,
46                       const SkXfermode::Mode modes[] = NULL,
47                       const CropRect* cropRect = NULL);
48private:
49    uint8_t*            fModes; // SkXfermode::Mode
50
51    // private storage, to avoid dynamically allocating storage for our copy
52    // of the modes (unless the count is so large we can't fit).
53    intptr_t    fStorage[16];
54
55    void initAllocModes();
56    void initModes(const SkXfermode::Mode []);
57
58    typedef SkImageFilter INHERITED;
59};
60
61#endif
62