Mercurial > hg > orthanc
annotate Core/FileFormats/PngWriter.cpp @ 797:37adac56017a
ImageAccessor abstraction
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 06 May 2014 12:47:26 +0200 |
parents | 2d0a347e8cfc |
children |
rev | line source |
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0 | 1 /** |
59 | 2 * Orthanc - A Lightweight, RESTful DICOM Store |
689 | 3 * Copyright (C) 2012-2014 Medical Physics Department, CHU of Liege, |
0 | 4 * Belgium |
5 * | |
6 * This program is free software: you can redistribute it and/or | |
7 * modify it under the terms of the GNU General Public License as | |
8 * published by the Free Software Foundation, either version 3 of the | |
9 * License, or (at your option) any later version. | |
136 | 10 * |
11 * In addition, as a special exception, the copyright holders of this | |
12 * program give permission to link the code of its release with the | |
13 * OpenSSL project's "OpenSSL" library (or with modified versions of it | |
14 * that use the same license as the "OpenSSL" library), and distribute | |
15 * the linked executables. You must obey the GNU General Public License | |
16 * in all respects for all of the code used other than "OpenSSL". If you | |
17 * modify file(s) with this exception, you may extend this exception to | |
18 * your version of the file(s), but you are not obligated to do so. If | |
19 * you do not wish to do so, delete this exception statement from your | |
20 * version. If you delete this exception statement from all source files | |
21 * in the program, then also delete it here. | |
0 | 22 * |
23 * This program is distributed in the hope that it will be useful, but | |
24 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
26 * General Public License for more details. | |
27 * | |
28 * You should have received a copy of the GNU General Public License | |
29 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
30 **/ | |
31 | |
32 | |
33 #include "PngWriter.h" | |
34 | |
35 #include <vector> | |
36 #include <stdint.h> | |
37 #include <png.h> | |
454 | 38 #include "../OrthancException.h" |
39 #include "../ChunkedBuffer.h" | |
40 #include "../Toolbox.h" | |
0 | 41 |
42 | |
43 // http://www.libpng.org/pub/png/libpng-1.2.5-manual.html#section-4 | |
44 // http://zarb.org/~gc/html/libpng.html | |
45 /* | |
46 void write_row_callback(png_ptr, png_uint_32 row, int pass) | |
47 { | |
48 }*/ | |
49 | |
50 | |
51 | |
52 | |
53 /* bool isError_; | |
54 | |
55 // http://www.libpng.org/pub/png/book/chapter14.html#png.ch14.div.2 | |
56 | |
57 static void ErrorHandler(png_structp png, png_const_charp message) | |
58 { | |
59 printf("** [%s]\n", message); | |
60 | |
61 PngWriter* that = (PngWriter*) png_get_error_ptr(png); | |
62 that->isError_ = true; | |
63 printf("** %d\n", (int)that); | |
64 | |
65 //((PngWriter*) payload)->isError_ = true; | |
66 } | |
67 | |
68 static void WarningHandler(png_structp png, png_const_charp message) | |
69 { | |
70 printf("++ %d\n", (int)message); | |
71 }*/ | |
72 | |
73 | |
59 | 74 namespace Orthanc |
0 | 75 { |
76 struct PngWriter::PImpl | |
77 { | |
78 png_structp png_; | |
79 png_infop info_; | |
80 | |
81 // Filled by Prepare() | |
82 std::vector<uint8_t*> rows_; | |
83 int bitDepth_; | |
84 int colorType_; | |
85 }; | |
86 | |
87 | |
88 | |
89 PngWriter::PngWriter() : pimpl_(new PImpl) | |
90 { | |
91 pimpl_->png_ = NULL; | |
92 pimpl_->info_ = NULL; | |
93 | |
94 pimpl_->png_ = png_create_write_struct | |
95 (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); //this, ErrorHandler, WarningHandler); | |
96 if (!pimpl_->png_) | |
97 { | |
59 | 98 throw OrthancException(ErrorCode_NotEnoughMemory); |
0 | 99 } |
100 | |
101 pimpl_->info_ = png_create_info_struct(pimpl_->png_); | |
102 if (!pimpl_->info_) | |
103 { | |
104 png_destroy_write_struct(&pimpl_->png_, NULL); | |
59 | 105 throw OrthancException(ErrorCode_NotEnoughMemory); |
0 | 106 } |
107 } | |
108 | |
109 PngWriter::~PngWriter() | |
110 { | |
111 if (pimpl_->info_) | |
112 { | |
113 png_destroy_info_struct(pimpl_->png_, &pimpl_->info_); | |
114 } | |
115 | |
116 if (pimpl_->png_) | |
117 { | |
118 png_destroy_write_struct(&pimpl_->png_, NULL); | |
119 } | |
120 } | |
121 | |
122 | |
123 | |
124 void PngWriter::Prepare(unsigned int width, | |
125 unsigned int height, | |
126 unsigned int pitch, | |
127 PixelFormat format, | |
128 const void* buffer) | |
129 { | |
130 pimpl_->rows_.resize(height); | |
131 for (unsigned int y = 0; y < height; y++) | |
132 { | |
133 pimpl_->rows_[y] = const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(buffer)) + y * pitch; | |
134 } | |
135 | |
136 switch (format) | |
137 { | |
368
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138 case PixelFormat_RGB24: |
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139 pimpl_->bitDepth_ = 8; |
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140 pimpl_->colorType_ = PNG_COLOR_TYPE_RGB; |
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141 break; |
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142 |
0 | 143 case PixelFormat_Grayscale8: |
144 pimpl_->bitDepth_ = 8; | |
145 pimpl_->colorType_ = PNG_COLOR_TYPE_GRAY; | |
146 break; | |
147 | |
148 case PixelFormat_Grayscale16: | |
465
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149 case PixelFormat_SignedGrayscale16: |
0 | 150 pimpl_->bitDepth_ = 16; |
151 pimpl_->colorType_ = PNG_COLOR_TYPE_GRAY; | |
152 break; | |
153 | |
154 default: | |
59 | 155 throw OrthancException(ErrorCode_NotImplemented); |
0 | 156 } |
157 } | |
158 | |
159 | |
160 void PngWriter::Compress(unsigned int width, | |
161 unsigned int height, | |
162 unsigned int pitch, | |
163 PixelFormat format) | |
164 { | |
165 png_set_IHDR(pimpl_->png_, pimpl_->info_, width, height, | |
166 pimpl_->bitDepth_, pimpl_->colorType_, PNG_INTERLACE_NONE, | |
167 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); | |
168 | |
169 png_write_info(pimpl_->png_, pimpl_->info_); | |
170 | |
171 if (height > 0) | |
172 { | |
173 switch (format) | |
174 { | |
175 case PixelFormat_Grayscale16: | |
465
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176 case PixelFormat_SignedGrayscale16: |
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177 { |
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178 int transforms = 0; |
453 | 179 if (Toolbox::DetectEndianness() == Endianness_Little) |
180 { | |
639
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181 transforms = PNG_TRANSFORM_SWAP_ENDIAN; |
453 | 182 } |
183 | |
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184 png_set_rows(pimpl_->png_, pimpl_->info_, &pimpl_->rows_[0]); |
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185 png_write_png(pimpl_->png_, pimpl_->info_, transforms, NULL); |
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186 |
0 | 187 break; |
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188 } |
0 | 189 |
190 default: | |
191 png_write_image(pimpl_->png_, &pimpl_->rows_[0]); | |
192 } | |
193 } | |
194 | |
195 png_write_end(pimpl_->png_, NULL); | |
196 } | |
197 | |
198 | |
199 void PngWriter::WriteToFile(const char* filename, | |
200 unsigned int width, | |
201 unsigned int height, | |
202 unsigned int pitch, | |
203 PixelFormat format, | |
204 const void* buffer) | |
205 { | |
206 Prepare(width, height, pitch, format, buffer); | |
207 | |
208 FILE* fp = fopen(filename, "wb"); | |
209 if (!fp) | |
210 { | |
59 | 211 throw OrthancException(ErrorCode_CannotWriteFile); |
0 | 212 } |
213 | |
214 png_init_io(pimpl_->png_, fp); | |
215 | |
216 if (setjmp(png_jmpbuf(pimpl_->png_))) | |
217 { | |
218 // Error during writing PNG | |
59 | 219 throw OrthancException(ErrorCode_CannotWriteFile); |
0 | 220 } |
221 | |
222 Compress(width, height, pitch, format); | |
223 | |
224 fclose(fp); | |
225 } | |
226 | |
227 | |
228 | |
229 | |
230 static void MemoryCallback(png_structp png_ptr, | |
231 png_bytep data, | |
232 png_size_t size) | |
233 { | |
656 | 234 ChunkedBuffer* buffer = reinterpret_cast<ChunkedBuffer*>(png_get_io_ptr(png_ptr)); |
0 | 235 buffer->AddChunk(reinterpret_cast<const char*>(data), size); |
236 } | |
237 | |
238 | |
239 | |
240 void PngWriter::WriteToMemory(std::string& png, | |
241 unsigned int width, | |
242 unsigned int height, | |
243 unsigned int pitch, | |
244 PixelFormat format, | |
245 const void* buffer) | |
246 { | |
247 ChunkedBuffer chunks; | |
248 | |
249 Prepare(width, height, pitch, format, buffer); | |
250 | |
251 if (setjmp(png_jmpbuf(pimpl_->png_))) | |
252 { | |
253 // Error during writing PNG | |
59 | 254 throw OrthancException(ErrorCode_InternalError); |
0 | 255 } |
256 | |
257 png_set_write_fn(pimpl_->png_, &chunks, MemoryCallback, NULL); | |
258 | |
259 Compress(width, height, pitch, format); | |
260 | |
261 chunks.Flatten(png); | |
262 } | |
263 } |