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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef UI_GFX_CODEC_PNG_CODEC_H_ | 5 #ifndef UI_GFX_CODEC_PNG_CODEC_H_ |
6 #define UI_GFX_CODEC_PNG_CODEC_H_ | 6 #define UI_GFX_CODEC_PNG_CODEC_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 #include <vector> | 9 #include <vector> |
10 | 10 |
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60 // multiplied. | 60 // multiplied. |
61 // | 61 // |
62 // size: dimensions of the image | 62 // size: dimensions of the image |
63 // row_byte_width: the width in bytes of each row. This may be greater than | 63 // row_byte_width: the width in bytes of each row. This may be greater than |
64 // w * bytes_per_pixel if there is extra padding at the end of each row | 64 // w * bytes_per_pixel if there is extra padding at the end of each row |
65 // (often, each row is padded to the next machine word). | 65 // (often, each row is padded to the next machine word). |
66 // discard_transparency: when true, and when the input data format includes | 66 // discard_transparency: when true, and when the input data format includes |
67 // alpha values, these alpha values will be discarded and only RGB will be | 67 // alpha values, these alpha values will be discarded and only RGB will be |
68 // written to the resulting file. Otherwise, alpha values in the input | 68 // written to the resulting file. Otherwise, alpha values in the input |
69 // will be preserved. | 69 // will be preserved. |
70 // discard_color: when true, color images will be converted to grayscale | |
71 // (can be used in combination with discard_transparency) | |
70 // comments: comments to be written in the png's metadata. | 72 // comments: comments to be written in the png's metadata. |
71 static bool Encode(const unsigned char* input, | 73 static bool Encode(const unsigned char* input, |
72 ColorFormat format, | 74 ColorFormat format, |
73 const Size& size, | 75 const Size& size, |
74 int row_byte_width, | 76 int row_byte_width, |
75 bool discard_transparency, | 77 bool discard_transparency, |
76 const std::vector<Comment>& comments, | 78 const std::vector<Comment>& comments, |
77 std::vector<unsigned char>* output); | 79 std::vector<unsigned char>* output, |
80 bool discard_color = false); | |
sadrul
2014/01/15 21:43:06
default parameter values are not allowed in chromi
| |
78 | 81 |
79 // Call PNGCodec::Encode on the supplied SkBitmap |input|, which is assumed | 82 // Call PNGCodec::Encode on the supplied SkBitmap |input|, which is assumed |
80 // to be BGRA, 32 bits per pixel. The params |discard_transparency| and | 83 // to be BGRA, 32 bits per pixel. The params |discard_transparency|, |
81 // |output| are passed directly to Encode; refer to Encode for more | 84 // |discard_color|, and |output| are passed directly to Encode; refer to |
82 // information. During the call, an SkAutoLockPixels lock is held on |input|. | 85 // Encode for more information. During the call, an SkAutoLockPixels lock |
86 // is held on |input|. | |
83 static bool EncodeBGRASkBitmap(const SkBitmap& input, | 87 static bool EncodeBGRASkBitmap(const SkBitmap& input, |
84 bool discard_transparency, | 88 bool discard_transparency, |
85 std::vector<unsigned char>* output); | 89 std::vector<unsigned char>* output, |
90 bool discard_color = false); | |
86 | 91 |
87 // Call PNGCodec::Encode on the supplied SkBitmap |input|. The difference | 92 // Call PNGCodec::Encode on the supplied SkBitmap |input|. The difference |
88 // between this and the previous method is that this restricts compression to | 93 // between this and the previous method is that this restricts compression to |
89 // zlib q1, which is just rle encoding. | 94 // zlib q1, which is just rle encoding. |
90 static bool FastEncodeBGRASkBitmap(const SkBitmap& input, | 95 static bool FastEncodeBGRASkBitmap(const SkBitmap& input, |
91 bool discard_transparency, | 96 bool discard_transparency, |
92 std::vector<unsigned char>* output); | 97 std::vector<unsigned char>* output, |
98 bool discard_color = false); | |
93 | 99 |
94 // Decodes the PNG data contained in input of length input_size. The | 100 // Decodes the PNG data contained in input of length input_size. The |
95 // decoded data will be placed in *output with the dimensions in *w and *h | 101 // decoded data will be placed in *output with the dimensions in *w and *h |
96 // on success (returns true). This data will be written in the 'format' | 102 // on success (returns true). This data will be written in the 'format' |
97 // format. On failure, the values of these output variables are undefined. | 103 // format. On failure, the values of these output variables are undefined. |
98 // | 104 // |
99 // This function may not support all PNG types, and it hasn't been tested | 105 // This function may not support all PNG types, and it hasn't been tested |
100 // with a large number of images, so assume a new format may not work. It's | 106 // with a large number of images, so assume a new format may not work. It's |
101 // really designed to be able to read in something written by Encode() above. | 107 // really designed to be able to read in something written by Encode() above. |
102 static bool Decode(const unsigned char* input, size_t input_size, | 108 static bool Decode(const unsigned char* input, size_t input_size, |
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114 static bool Decode(const unsigned char* input, size_t input_size, | 120 static bool Decode(const unsigned char* input, size_t input_size, |
115 SkBitmap* bitmap); | 121 SkBitmap* bitmap); |
116 | 122 |
117 private: | 123 private: |
118 DISALLOW_COPY_AND_ASSIGN(PNGCodec); | 124 DISALLOW_COPY_AND_ASSIGN(PNGCodec); |
119 }; | 125 }; |
120 | 126 |
121 } // namespace gfx | 127 } // namespace gfx |
122 | 128 |
123 #endif // UI_GFX_CODEC_PNG_CODEC_H_ | 129 #endif // UI_GFX_CODEC_PNG_CODEC_H_ |
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