1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef SkKernel33MaskFilter_DEFINED
18#define SkKernel33MaskFilter_DEFINED
19
20#include "SkMaskFilter.h"
21
22class SkKernel33ProcMaskFilter : public SkMaskFilter {
23public:
24    SkKernel33ProcMaskFilter(unsigned percent256 = 256)
25        : fPercent256(percent256) {}
26
27    virtual uint8_t computeValue(uint8_t* const* srcRows) = 0;
28
29    // overrides from SkMaskFilter
30    virtual SkMask::Format getFormat();
31    virtual bool filterMask(SkMask*, const SkMask&, const SkMatrix&, SkIPoint*);
32
33    // overrides from SkFlattenable
34    virtual void flatten(SkFlattenableWriteBuffer& wb);
35
36protected:
37    SkKernel33ProcMaskFilter(SkFlattenableReadBuffer& rb);
38
39private:
40    int fPercent256;
41
42    typedef SkMaskFilter INHERITED;
43};
44
45///////////////////////////////////////////////////////////////////////////////
46
47class SkKernel33MaskFilter : public SkKernel33ProcMaskFilter {
48public:
49    SkKernel33MaskFilter(const int coeff[3][3], int shift, int percent256 = 256)
50        : SkKernel33ProcMaskFilter(percent256)
51    {
52        memcpy(fKernel, coeff, 9 * sizeof(int));
53        fShift = shift;
54    }
55
56    // override from SkKernel33ProcMaskFilter
57    virtual uint8_t computeValue(uint8_t* const* srcRows);
58
59    // overrides from SkFlattenable
60    virtual void flatten(SkFlattenableWriteBuffer& wb);
61    virtual Factory getFactory();
62
63private:
64    int fKernel[3][3];
65    int fShift;
66
67    SkKernel33MaskFilter(SkFlattenableReadBuffer& rb);
68    static SkFlattenable* Create(SkFlattenableReadBuffer& rb);
69
70    typedef SkKernel33ProcMaskFilter INHERITED;
71};
72
73#endif
74