Mercurial > hg > orthanc
comparison Core/FileFormats/PngWriter.cpp @ 454:6f47a4262618
reorganization
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 04 Jul 2013 15:18:33 +0200 |
parents | Core/PngWriter.cpp@30086c1aca30 |
children | 7a966b440f19 |
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453:30086c1aca30 | 454:6f47a4262618 |
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1 /** | |
2 * Orthanc - A Lightweight, RESTful DICOM Store | |
3 * Copyright (C) 2012-2013 Medical Physics Department, CHU of Liege, | |
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. | |
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. | |
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> | |
38 #include "../OrthancException.h" | |
39 #include "../ChunkedBuffer.h" | |
40 #include "../Toolbox.h" | |
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 | |
74 namespace Orthanc | |
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 { | |
98 throw OrthancException(ErrorCode_NotEnoughMemory); | |
99 } | |
100 | |
101 pimpl_->info_ = png_create_info_struct(pimpl_->png_); | |
102 if (!pimpl_->info_) | |
103 { | |
104 png_destroy_write_struct(&pimpl_->png_, NULL); | |
105 throw OrthancException(ErrorCode_NotEnoughMemory); | |
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 { | |
138 case PixelFormat_RGB24: | |
139 pimpl_->bitDepth_ = 8; | |
140 pimpl_->colorType_ = PNG_COLOR_TYPE_RGB; | |
141 break; | |
142 | |
143 case PixelFormat_Grayscale8: | |
144 pimpl_->bitDepth_ = 8; | |
145 pimpl_->colorType_ = PNG_COLOR_TYPE_GRAY; | |
146 break; | |
147 | |
148 case PixelFormat_Grayscale16: | |
149 pimpl_->bitDepth_ = 16; | |
150 pimpl_->colorType_ = PNG_COLOR_TYPE_GRAY; | |
151 break; | |
152 | |
153 default: | |
154 throw OrthancException(ErrorCode_NotImplemented); | |
155 } | |
156 } | |
157 | |
158 | |
159 void PngWriter::Compress(unsigned int width, | |
160 unsigned int height, | |
161 unsigned int pitch, | |
162 PixelFormat format) | |
163 { | |
164 png_set_IHDR(pimpl_->png_, pimpl_->info_, width, height, | |
165 pimpl_->bitDepth_, pimpl_->colorType_, PNG_INTERLACE_NONE, | |
166 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); | |
167 | |
168 png_write_info(pimpl_->png_, pimpl_->info_); | |
169 | |
170 if (height > 0) | |
171 { | |
172 switch (format) | |
173 { | |
174 case PixelFormat_Grayscale16: | |
175 png_set_rows(pimpl_->png_, pimpl_->info_, &pimpl_->rows_[0]); | |
176 | |
177 if (Toolbox::DetectEndianness() == Endianness_Little) | |
178 { | |
179 // Must swap the endianness!! | |
180 png_write_png(pimpl_->png_, pimpl_->info_, PNG_TRANSFORM_SWAP_ENDIAN, NULL); | |
181 } | |
182 | |
183 break; | |
184 | |
185 default: | |
186 png_write_image(pimpl_->png_, &pimpl_->rows_[0]); | |
187 } | |
188 } | |
189 | |
190 png_write_end(pimpl_->png_, NULL); | |
191 } | |
192 | |
193 | |
194 void PngWriter::WriteToFile(const char* filename, | |
195 unsigned int width, | |
196 unsigned int height, | |
197 unsigned int pitch, | |
198 PixelFormat format, | |
199 const void* buffer) | |
200 { | |
201 Prepare(width, height, pitch, format, buffer); | |
202 | |
203 FILE* fp = fopen(filename, "wb"); | |
204 if (!fp) | |
205 { | |
206 throw OrthancException(ErrorCode_CannotWriteFile); | |
207 } | |
208 | |
209 png_init_io(pimpl_->png_, fp); | |
210 | |
211 if (setjmp(png_jmpbuf(pimpl_->png_))) | |
212 { | |
213 // Error during writing PNG | |
214 throw OrthancException(ErrorCode_CannotWriteFile); | |
215 } | |
216 | |
217 Compress(width, height, pitch, format); | |
218 | |
219 fclose(fp); | |
220 } | |
221 | |
222 | |
223 | |
224 | |
225 static void MemoryCallback(png_structp png_ptr, | |
226 png_bytep data, | |
227 png_size_t size) | |
228 { | |
229 ChunkedBuffer* buffer = (ChunkedBuffer*) png_get_io_ptr(png_ptr); | |
230 buffer->AddChunk(reinterpret_cast<const char*>(data), size); | |
231 } | |
232 | |
233 | |
234 | |
235 void PngWriter::WriteToMemory(std::string& png, | |
236 unsigned int width, | |
237 unsigned int height, | |
238 unsigned int pitch, | |
239 PixelFormat format, | |
240 const void* buffer) | |
241 { | |
242 ChunkedBuffer chunks; | |
243 | |
244 Prepare(width, height, pitch, format, buffer); | |
245 | |
246 if (setjmp(png_jmpbuf(pimpl_->png_))) | |
247 { | |
248 // Error during writing PNG | |
249 throw OrthancException(ErrorCode_InternalError); | |
250 } | |
251 | |
252 png_set_write_fn(pimpl_->png_, &chunks, MemoryCallback, NULL); | |
253 | |
254 Compress(width, height, pitch, format); | |
255 | |
256 chunks.Flatten(png); | |
257 } | |
258 } |