Mercurial > hg > orthanc
comparison Core/PngWriter.cpp @ 0:3959d33612cc
initial commit
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 19 Jul 2012 14:32:22 +0200 |
parents | |
children | a15e90e5d6fc |
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-1:000000000000 | 0:3959d33612cc |
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1 /** | |
2 * Palantir - A Lightweight, RESTful DICOM Store | |
3 * Copyright (C) 2012 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 * This program is distributed in the hope that it will be useful, but | |
12 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 * General Public License for more details. | |
15 * | |
16 * You should have received a copy of the GNU General Public License | |
17 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 **/ | |
19 | |
20 | |
21 #include "PngWriter.h" | |
22 | |
23 #include <vector> | |
24 #include <stdint.h> | |
25 #include <png.h> | |
26 #include "PalantirException.h" | |
27 #include "ChunkedBuffer.h" | |
28 | |
29 | |
30 // http://www.libpng.org/pub/png/libpng-1.2.5-manual.html#section-4 | |
31 // http://zarb.org/~gc/html/libpng.html | |
32 /* | |
33 void write_row_callback(png_ptr, png_uint_32 row, int pass) | |
34 { | |
35 }*/ | |
36 | |
37 | |
38 | |
39 | |
40 /* bool isError_; | |
41 | |
42 // http://www.libpng.org/pub/png/book/chapter14.html#png.ch14.div.2 | |
43 | |
44 static void ErrorHandler(png_structp png, png_const_charp message) | |
45 { | |
46 printf("** [%s]\n", message); | |
47 | |
48 PngWriter* that = (PngWriter*) png_get_error_ptr(png); | |
49 that->isError_ = true; | |
50 printf("** %d\n", (int)that); | |
51 | |
52 //((PngWriter*) payload)->isError_ = true; | |
53 } | |
54 | |
55 static void WarningHandler(png_structp png, png_const_charp message) | |
56 { | |
57 printf("++ %d\n", (int)message); | |
58 }*/ | |
59 | |
60 | |
61 namespace Palantir | |
62 { | |
63 struct PngWriter::PImpl | |
64 { | |
65 png_structp png_; | |
66 png_infop info_; | |
67 | |
68 // Filled by Prepare() | |
69 std::vector<uint8_t*> rows_; | |
70 int bitDepth_; | |
71 int colorType_; | |
72 }; | |
73 | |
74 | |
75 | |
76 PngWriter::PngWriter() : pimpl_(new PImpl) | |
77 { | |
78 pimpl_->png_ = NULL; | |
79 pimpl_->info_ = NULL; | |
80 | |
81 pimpl_->png_ = png_create_write_struct | |
82 (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); //this, ErrorHandler, WarningHandler); | |
83 if (!pimpl_->png_) | |
84 { | |
85 throw PalantirException(ErrorCode_NotEnoughMemory); | |
86 } | |
87 | |
88 pimpl_->info_ = png_create_info_struct(pimpl_->png_); | |
89 if (!pimpl_->info_) | |
90 { | |
91 png_destroy_write_struct(&pimpl_->png_, NULL); | |
92 throw PalantirException(ErrorCode_NotEnoughMemory); | |
93 } | |
94 } | |
95 | |
96 PngWriter::~PngWriter() | |
97 { | |
98 if (pimpl_->info_) | |
99 { | |
100 png_destroy_info_struct(pimpl_->png_, &pimpl_->info_); | |
101 } | |
102 | |
103 if (pimpl_->png_) | |
104 { | |
105 png_destroy_write_struct(&pimpl_->png_, NULL); | |
106 } | |
107 } | |
108 | |
109 | |
110 | |
111 void PngWriter::Prepare(unsigned int width, | |
112 unsigned int height, | |
113 unsigned int pitch, | |
114 PixelFormat format, | |
115 const void* buffer) | |
116 { | |
117 pimpl_->rows_.resize(height); | |
118 for (unsigned int y = 0; y < height; y++) | |
119 { | |
120 pimpl_->rows_[y] = const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(buffer)) + y * pitch; | |
121 } | |
122 | |
123 switch (format) | |
124 { | |
125 case PixelFormat_Grayscale8: | |
126 pimpl_->bitDepth_ = 8; | |
127 pimpl_->colorType_ = PNG_COLOR_TYPE_GRAY; | |
128 break; | |
129 | |
130 case PixelFormat_Grayscale16: | |
131 pimpl_->bitDepth_ = 16; | |
132 pimpl_->colorType_ = PNG_COLOR_TYPE_GRAY; | |
133 break; | |
134 | |
135 default: | |
136 throw PalantirException(ErrorCode_NotImplemented); | |
137 } | |
138 } | |
139 | |
140 | |
141 void PngWriter::Compress(unsigned int width, | |
142 unsigned int height, | |
143 unsigned int pitch, | |
144 PixelFormat format) | |
145 { | |
146 png_set_IHDR(pimpl_->png_, pimpl_->info_, width, height, | |
147 pimpl_->bitDepth_, pimpl_->colorType_, PNG_INTERLACE_NONE, | |
148 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); | |
149 | |
150 png_write_info(pimpl_->png_, pimpl_->info_); | |
151 | |
152 if (height > 0) | |
153 { | |
154 switch (format) | |
155 { | |
156 case PixelFormat_Grayscale16: | |
157 // Must swap the endianness!! | |
158 png_set_rows(pimpl_->png_, pimpl_->info_, &pimpl_->rows_[0]); | |
159 png_write_png(pimpl_->png_, pimpl_->info_, PNG_TRANSFORM_SWAP_ENDIAN, NULL); | |
160 break; | |
161 | |
162 default: | |
163 png_write_image(pimpl_->png_, &pimpl_->rows_[0]); | |
164 } | |
165 } | |
166 | |
167 png_write_end(pimpl_->png_, NULL); | |
168 } | |
169 | |
170 | |
171 void PngWriter::WriteToFile(const char* filename, | |
172 unsigned int width, | |
173 unsigned int height, | |
174 unsigned int pitch, | |
175 PixelFormat format, | |
176 const void* buffer) | |
177 { | |
178 Prepare(width, height, pitch, format, buffer); | |
179 | |
180 FILE* fp = fopen(filename, "wb"); | |
181 if (!fp) | |
182 { | |
183 throw PalantirException(ErrorCode_CannotWriteFile); | |
184 } | |
185 | |
186 png_init_io(pimpl_->png_, fp); | |
187 | |
188 if (setjmp(png_jmpbuf(pimpl_->png_))) | |
189 { | |
190 // Error during writing PNG | |
191 throw PalantirException(ErrorCode_CannotWriteFile); | |
192 } | |
193 | |
194 Compress(width, height, pitch, format); | |
195 | |
196 fclose(fp); | |
197 } | |
198 | |
199 | |
200 | |
201 | |
202 static void MemoryCallback(png_structp png_ptr, | |
203 png_bytep data, | |
204 png_size_t size) | |
205 { | |
206 ChunkedBuffer* buffer = (ChunkedBuffer*) png_get_io_ptr(png_ptr); | |
207 buffer->AddChunk(reinterpret_cast<const char*>(data), size); | |
208 } | |
209 | |
210 | |
211 | |
212 void PngWriter::WriteToMemory(std::string& png, | |
213 unsigned int width, | |
214 unsigned int height, | |
215 unsigned int pitch, | |
216 PixelFormat format, | |
217 const void* buffer) | |
218 { | |
219 ChunkedBuffer chunks; | |
220 | |
221 Prepare(width, height, pitch, format, buffer); | |
222 | |
223 if (setjmp(png_jmpbuf(pimpl_->png_))) | |
224 { | |
225 // Error during writing PNG | |
226 throw PalantirException(ErrorCode_InternalError); | |
227 } | |
228 | |
229 png_set_write_fn(pimpl_->png_, &chunks, MemoryCallback, NULL); | |
230 | |
231 Compress(width, height, pitch, format); | |
232 | |
233 chunks.Flatten(png); | |
234 } | |
235 } |