Mercurial > hg > orthanc
annotate Core/PngWriter.cpp @ 453:30086c1aca30
endianness
| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Thu, 04 Jul 2013 14:29:44 +0200 |
| parents | bdd72233b105 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /** |
| 59 | 2 * Orthanc - A Lightweight, RESTful DICOM Store |
| 398 | 3 * Copyright (C) 2012-2013 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> | |
| 59 | 38 #include "OrthancException.h" |
| 0 | 39 #include "ChunkedBuffer.h" |
| 453 | 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 { | |
|
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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: | |
| 149 pimpl_->bitDepth_ = 16; | |
| 150 pimpl_->colorType_ = PNG_COLOR_TYPE_GRAY; | |
| 151 break; | |
| 152 | |
| 153 default: | |
| 59 | 154 throw OrthancException(ErrorCode_NotImplemented); |
| 0 | 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]); | |
| 453 | 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 | |
| 0 | 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 { | |
| 59 | 206 throw OrthancException(ErrorCode_CannotWriteFile); |
| 0 | 207 } |
| 208 | |
| 209 png_init_io(pimpl_->png_, fp); | |
| 210 | |
| 211 if (setjmp(png_jmpbuf(pimpl_->png_))) | |
| 212 { | |
| 213 // Error during writing PNG | |
| 59 | 214 throw OrthancException(ErrorCode_CannotWriteFile); |
| 0 | 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 | |
| 59 | 249 throw OrthancException(ErrorCode_InternalError); |
| 0 | 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 } |