SkMorphologyImageFilter.h revision ae761f7545d8ebf181d220169afac2056b057b8c 
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
9#ifndef SkMorphologyImageFilter_DEFINED
10#define SkMorphologyImageFilter_DEFINED
11
12#include "SkColor.h"
13#include "SkImageFilter.h"
14#include "SkSize.h"
15
16class SK_API SkMorphologyImageFilter : public SkImageFilter {
17public:
18    SkMorphologyImageFilter(int radiusX, int radiusY, SkImageFilter* input, const CropRect* cropRect);
19    virtual void computeFastBounds(const SkRect& src, SkRect* dst) const SK_OVERRIDE;
20    virtual bool onFilterBounds(const SkIRect& src, const SkMatrix& ctm, SkIRect* dst) const SK_OVERRIDE;
21
22    /**
23     * All morphology procs have the same signature: src is the source buffer, dst the
24     * destination buffer, radius is the morphology radius, width and height are the bounds
25     * of the destination buffer (in pixels), and srcStride and dstStride are the
26     * number of pixels per row in each buffer. All buffers are 8888.
27     */
28
29    typedef void (*Proc)(const SkPMColor* src, SkPMColor* dst, int radius,
30                         int width, int height, int srcStride, int dstStride);
31
32protected:
33    bool filterImageGeneric(Proc procX, Proc procY,
34                            Proxy*, const SkBitmap& src, const SkMatrix&,
35                            SkBitmap* result, SkIPoint* offset) const;
36    SkMorphologyImageFilter(SkReadBuffer& buffer);
37    virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
38#if SK_SUPPORT_GPU
39    virtual bool canFilterImageGPU() const SK_OVERRIDE { return true; }
40    bool filterImageGPUGeneric(bool dilate, Proxy* proxy, const SkBitmap& src,
41                               const SkMatrix& ctm, SkBitmap* result,
42                               SkIPoint* offset) const;
43#endif
44
45    SkISize    radius() const { return fRadius; }
46
47private:
48    SkISize    fRadius;
49    typedef SkImageFilter INHERITED;
50};
51
52class SK_API SkDilateImageFilter : public SkMorphologyImageFilter {
53public:
54    SkDilateImageFilter(int radiusX, int radiusY,
55                        SkImageFilter* input = NULL,
56                        const CropRect* cropRect = NULL)
57    : INHERITED(radiusX, radiusY, input, cropRect) {}
58
59    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&,
60                               SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
61#if SK_SUPPORT_GPU
62    virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
63                                SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
64#endif
65
66    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDilateImageFilter)
67
68protected:
69    SkDilateImageFilter(SkReadBuffer& buffer) : INHERITED(buffer) {}
70
71private:
72    typedef SkMorphologyImageFilter INHERITED;
73};
74
75class SK_API SkErodeImageFilter : public SkMorphologyImageFilter {
76public:
77    SkErodeImageFilter(int radiusX, int radiusY,
78                       SkImageFilter* input = NULL,
79                       const CropRect* cropRect = NULL)
80    : INHERITED(radiusX, radiusY, input, cropRect) {}
81
82    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const SkMatrix&,
83                               SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
84#if SK_SUPPORT_GPU
85    virtual bool filterImageGPU(Proxy* proxy, const SkBitmap& src, const SkMatrix& ctm,
86                                SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE;
87#endif
88
89    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkErodeImageFilter)
90
91protected:
92    SkErodeImageFilter(SkReadBuffer& buffer) : INHERITED(buffer) {}
93
94private:
95    typedef SkMorphologyImageFilter INHERITED;
96};
97
98#endif
99