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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 #ifndef SkSampler_DEFINED | 7 #ifndef SkSampler_DEFINED |
8 #define SkSampler_DEFINED | 8 #define SkSampler_DEFINED |
9 | 9 |
10 #include "SkCodec.h" | 10 #include "SkCodec.h" |
11 #include "SkTypes.h" | 11 #include "SkTypes.h" |
12 | 12 |
13 class SkSampler : public SkNoncopyable { | 13 class SkSampler : public SkNoncopyable { |
14 public: | 14 public: |
15 /** | 15 /** |
16 * Update the sampler to sample every sampleX'th pixel. Returns the | 16 * Update the sampler to sample every sampleX'th pixel. Returns the |
17 * width after sampling. | 17 * width after sampling. |
18 */ | 18 */ |
19 int setSampleX(int sampleX) { | 19 int setSampleX(int sampleX) { |
20 return this->onSetSampleX(sampleX); | 20 return this->onSetSampleX(sampleX); |
21 } | 21 } |
22 | 22 |
23 /** | 23 /** |
24 * Update the sampler to sample every sampleY'th row. | |
25 */ | |
26 void setSampleY(int sampleY) { | |
27 fSampleY = sampleY; | |
28 } | |
29 | |
30 /** | |
31 * Retrieve the value set for sampleY. | |
32 */ | |
33 int sampleY() const { | |
34 return fSampleY; | |
35 } | |
36 | |
37 /** | |
38 * Based on fSampleY, return whether this row belongs in the output. | |
39 * | |
40 * @param row Row of the image, starting with the first row used in the | |
41 * output. | |
42 */ | |
43 bool rowNeeded(int row) const { | |
44 return row % fSampleY == 0; | |
45 } | |
46 | |
47 /** | |
48 * Fill the remainder of the destination with a single color | 24 * Fill the remainder of the destination with a single color |
49 * | 25 * |
50 * @param info | 26 * @param info |
51 * Contains the color type of the rows to fill. | 27 * Contains the color type of the rows to fill. |
52 * Contains the width of the destination rows to fill | 28 * Contains the width of the destination rows to fill |
53 * Contains the number of rows that we need to fill. | 29 * Contains the number of rows that we need to fill. |
54 * | 30 * |
55 * @param dst | 31 * @param dst |
56 * The destination row to fill from. | 32 * The destination row to fill from. |
57 * | 33 * |
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71 */ | 47 */ |
72 static void Fill(const SkImageInfo& info, void* dst, size_t rowBytes, | 48 static void Fill(const SkImageInfo& info, void* dst, size_t rowBytes, |
73 uint32_t colorOrIndex, SkCodec::ZeroInitialized zeroInit); | 49 uint32_t colorOrIndex, SkCodec::ZeroInitialized zeroInit); |
74 | 50 |
75 /** | 51 /** |
76 * Allow subclasses to implement unique versions of fill(). | 52 * Allow subclasses to implement unique versions of fill(). |
77 */ | 53 */ |
78 virtual void fill(const SkImageInfo& info, void* dst, size_t rowBytes, | 54 virtual void fill(const SkImageInfo& info, void* dst, size_t rowBytes, |
79 uint32_t colorOrIndex, SkCodec::ZeroInitialized zeroInit) {} | 55 uint32_t colorOrIndex, SkCodec::ZeroInitialized zeroInit) {} |
80 | 56 |
81 SkSampler() | |
82 : fSampleY(1) | |
83 {} | |
84 | |
85 virtual ~SkSampler() {} | 57 virtual ~SkSampler() {} |
86 private: | 58 private: |
87 int fSampleY; | |
88 | 59 |
89 virtual int onSetSampleX(int) = 0; | 60 virtual int onSetSampleX(int) = 0; |
90 }; | 61 }; |
91 | 62 |
92 #endif // SkSampler_DEFINED | 63 #endif // SkSampler_DEFINED |
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