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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2014 The Chromium Authors. All rights reserved. |
sky
2015/05/06 21:44:27
2015 and no c.
Ed Baker
2015/05/07 00:31:41
Done.
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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_JPEG_CODEC_H_ | 5 #ifndef UI_GFX_CHROMEOS_CODEC_JPEG_CODEC_ROBUST_SLOW_H_ |
6 #define UI_GFX_CODEC_JPEG_CODEC_H_ | 6 #define UI_GFX_CHROMEOS_CODEC_JPEG_CODEC_ROBUST_SLOW_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 #include <vector> | 9 #include <vector> |
10 | 10 |
11 #include "ui/gfx/gfx_export.h" | 11 #include "ui/gfx/gfx_export.h" |
12 | 12 |
13 class SkBitmap; | 13 class SkBitmap; |
14 | 14 |
15 namespace gfx { | 15 namespace gfx { |
16 | 16 |
17 // Interface for encoding/decoding JPEG data. This is a wrapper around libjpeg, | 17 // Interface for encoding/decoding JPEG data. This is a wrapper around libjpeg, |
18 // which has an inconvenient interface for callers. This is only used for UI | 18 // which has an inconvenient interface for callers. This is only used for |
19 // elements, WebKit has its own more complicated JPEG decoder which handles, | 19 // servicing ChromeUtilityMsg_RobustJPEGDecodeImage and is currently unique |
20 // among other things, partially downloaded data. | 20 // to Chrome OS. |
21 class GFX_EXPORT JPEGCodec { | 21 class GFX_EXPORT JPEGCodecRobustSlow { |
sky
2015/05/06 21:44:27
Similar comment about name.
Ed Baker
2015/05/07 00:31:41
Acknowledged.
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22 public: | 22 public: |
23 enum ColorFormat { | 23 enum ColorFormat { |
24 // 3 bytes per pixel (packed), in RGB order regardless of endianness. | 24 // 3 bytes per pixel (packed), in RGB order regardless of endianness. |
25 // This is the native JPEG format. | 25 // This is the native JPEG format. |
26 FORMAT_RGB, | 26 FORMAT_RGB, |
27 | 27 |
28 // 4 bytes per pixel, in RGBA order in mem regardless of endianness. | 28 // 4 bytes per pixel, in RGBA order in mem regardless of endianness. |
29 FORMAT_RGBA, | 29 FORMAT_RGBA, |
30 | 30 |
31 // 4 bytes per pixel, in BGRA order in mem regardless of endianness. | 31 // 4 bytes per pixel, in BGRA order in mem regardless of endianness. |
32 // This is the default Windows DIB order. | 32 // This is the default Windows DIB order. |
33 FORMAT_BGRA, | 33 FORMAT_BGRA, |
34 | 34 |
35 // 4 bytes per pixel, it can be either RGBA or BGRA. It depends on the bit | 35 // 4 bytes per pixel, it can be either RGBA or BGRA. It depends on the bit |
36 // order in kARGB_8888_Config skia bitmap. | 36 // order in kARGB_8888_Config skia bitmap. |
37 FORMAT_SkBitmap | 37 FORMAT_SkBitmap |
38 }; | 38 }; |
39 | 39 |
40 enum LibraryVariant { | |
41 SYSTEM_LIBJPEG = 0, | |
42 LIBJPEG_TURBO, | |
43 IJG_LIBJPEG, | |
44 }; | |
45 | |
46 // This method helps identify at run time which library chromium is using. | |
47 static LibraryVariant JpegLibraryVariant(); | |
48 | |
49 // Encodes the given raw 'input' data, with each pixel being represented as | |
50 // given in 'format'. The encoded JPEG data will be written into the supplied | |
51 // vector and true will be returned on success. On failure (false), the | |
52 // contents of the output buffer are undefined. | |
53 // | |
54 // w, h: dimensions of the image | |
55 // row_byte_width: the width in bytes of each row. This may be greater than | |
56 // w * bytes_per_pixel if there is extra padding at the end of each row | |
57 // (often, each row is padded to the next machine word). | |
58 // quality: an integer in the range 0-100, where 100 is the highest quality. | |
59 static bool Encode(const unsigned char* input, ColorFormat format, | |
60 int w, int h, int row_byte_width, | |
61 int quality, std::vector<unsigned char>* output); | |
62 | |
63 // Decodes the JPEG data contained in input of length input_size. The | 40 // Decodes the JPEG data contained in input of length input_size. The |
64 // decoded data will be placed in *output with the dimensions in *w and *h | 41 // decoded data will be placed in *output with the dimensions in *w and *h |
65 // on success (returns true). This data will be written in the'format' | 42 // on success (returns true). This data will be written in the'format' |
66 // format. On failure, the values of these output variables is undefined. | 43 // format. On failure, the values of these output variables is undefined. |
67 static bool Decode(const unsigned char* input, size_t input_size, | 44 static bool Decode(const unsigned char* input, size_t input_size, |
68 ColorFormat format, std::vector<unsigned char>* output, | 45 ColorFormat format, std::vector<unsigned char>* output, |
69 int* w, int* h); | 46 int* w, int* h); |
70 | 47 |
71 // Decodes the JPEG data contained in input of length input_size. If | 48 // Decodes the JPEG data contained in input of length input_size. If |
72 // successful, a SkBitmap is created and returned. It is up to the caller | 49 // successful, a SkBitmap is created and returned. It is up to the caller |
73 // to delete the returned bitmap. | 50 // to delete the returned bitmap. |
74 static SkBitmap* Decode(const unsigned char* input, size_t input_size); | 51 static SkBitmap* Decode(const unsigned char* input, size_t input_size); |
75 }; | 52 }; |
76 | 53 |
77 } // namespace gfx | 54 } // namespace gfx |
78 | 55 |
79 #endif // UI_GFX_CODEC_JPEG_CODEC_H_ | 56 #endif // UI_GFX_CHROMEOS_CODEC_JPEG_CODEC_ROBUST_SLOW_H_ |
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