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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 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 // This is a duplicate of chromium's src/tools/imagediff/image_diff_png.cc | 5 // This is a duplicate of chromium's src/tools/imagediff/image_diff_png.cc |
6 // that has been modified to build in a pdfium environment, which itself | 6 // that has been modified to build in a pdfium environment, which itself |
7 // was duplicated as follows: | 7 // was duplicated as follows: |
8 | 8 |
9 // This is a duplicate of ui/gfx/codec/png_codec.cc, after removing code related | 9 // This is a duplicate of ui/gfx/codec/png_codec.cc, after removing code related |
10 // to Skia, that we can use when running layout tests with minimal dependencies. | 10 // to Skia, that we can use when running layout tests with minimal dependencies. |
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62 const unsigned char* pixel_in = &rgba[x * 4]; | 62 const unsigned char* pixel_in = &rgba[x * 4]; |
63 unsigned char* pixel_out = &rgb[x * 3]; | 63 unsigned char* pixel_out = &rgb[x * 3]; |
64 pixel_out[0] = pixel_in[0]; | 64 pixel_out[0] = pixel_in[0]; |
65 pixel_out[1] = pixel_in[1]; | 65 pixel_out[1] = pixel_in[1]; |
66 pixel_out[2] = pixel_in[2]; | 66 pixel_out[2] = pixel_in[2]; |
67 } | 67 } |
68 } | 68 } |
69 | 69 |
70 } // namespace | 70 } // namespace |
71 | 71 |
72 // Decoder -------------------------------------------------------------------- | 72 // Decoder |
73 // | 73 // |
74 // This code is based on WebKit libpng interface (PNGImageDecoder), which is | 74 // This code is based on WebKit libpng interface (PNGImageDecoder), which is |
75 // in turn based on the Mozilla png decoder. | 75 // in turn based on the Mozilla png decoder. |
76 | 76 |
77 namespace { | 77 namespace { |
78 | 78 |
79 // Gamma constants: We assume we're on Windows which uses a gamma of 2.2. | 79 // Gamma constants: We assume we're on Windows which uses a gamma of 2.2. |
80 const double kMaxGamma = 21474.83; // Maximum gamma accepted by png library. | 80 const double kMaxGamma = 21474.83; // Maximum gamma accepted by png library. |
81 const double kDefaultGamma = 2.2; | 81 const double kDefaultGamma = 2.2; |
82 const double kInverseGamma = 1.0 / kDefaultGamma; | 82 const double kInverseGamma = 1.0 / kDefaultGamma; |
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348 // this file must be truncated. | 348 // this file must be truncated. |
349 output->clear(); | 349 output->clear(); |
350 return false; | 350 return false; |
351 } | 351 } |
352 | 352 |
353 *w = state.width; | 353 *w = state.width; |
354 *h = state.height; | 354 *h = state.height; |
355 return true; | 355 return true; |
356 } | 356 } |
357 | 357 |
358 // Encoder -------------------------------------------------------------------- | 358 // Encoder |
359 // | 359 // |
360 // This section of the code is based on nsPNGEncoder.cpp in Mozilla | 360 // This section of the code is based on nsPNGEncoder.cpp in Mozilla |
361 // (Copyright 2005 Google Inc.) | 361 // (Copyright 2005 Google Inc.) |
362 | 362 |
363 namespace { | 363 namespace { |
364 | 364 |
365 // Passed around as the io_ptr in the png structs so our callbacks know where | 365 // Passed around as the io_ptr in the png structs so our callbacks know where |
366 // to write data. | 366 // to write data. |
367 struct PngEncoderState { | 367 struct PngEncoderState { |
368 explicit PngEncoderState(std::vector<unsigned char>* o) : out(o) {} | 368 explicit PngEncoderState(std::vector<unsigned char>* o) : out(o) {} |
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635 int height, | 635 int height, |
636 int row_byte_width, | 636 int row_byte_width, |
637 bool discard_transparency, | 637 bool discard_transparency, |
638 std::vector<unsigned char>* output) { | 638 std::vector<unsigned char>* output) { |
639 return Encode(input, FORMAT_BGRA, | 639 return Encode(input, FORMAT_BGRA, |
640 width, height, row_byte_width, discard_transparency, | 640 width, height, row_byte_width, discard_transparency, |
641 std::vector<Comment>(), output); | 641 std::vector<Comment>(), output); |
642 } | 642 } |
643 | 643 |
644 } // namespace image_diff_png | 644 } // namespace image_diff_png |
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