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25
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "../PrecompiledHeaders.h"
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34 #include "PngWriter.h"
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35
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36 #include <vector>
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37 #include <stdint.h>
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38 #include <png.h>
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39 #include "../OrthancException.h"
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40 #include "../ChunkedBuffer.h"
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41 #include "../Toolbox.h"
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42
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43
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44 // http://www.libpng.org/pub/png/libpng-1.2.5-manual.html#section-4
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45 // http://zarb.org/~gc/html/libpng.html
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46 /*
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47 void write_row_callback(png_ptr, png_uint_32 row, int pass)
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48 {
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49 }*/
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50
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51
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52
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53
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54 /* bool isError_;
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55
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56 // http://www.libpng.org/pub/png/book/chapter14.html#png.ch14.div.2
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57
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58 static void ErrorHandler(png_structp png, png_const_charp message)
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59 {
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60 printf("** [%s]\n", message);
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61
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62 PngWriter* that = (PngWriter*) png_get_error_ptr(png);
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63 that->isError_ = true;
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64 printf("** %d\n", (int)that);
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65
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66 //((PngWriter*) payload)->isError_ = true;
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67 }
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68
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69 static void WarningHandler(png_structp png, png_const_charp message)
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70 {
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71 printf("++ %d\n", (int)message);
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72 }*/
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73
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74
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75 namespace Orthanc
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76 {
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77 struct PngWriter::PImpl
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78 {
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79 png_structp png_;
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80 png_infop info_;
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81
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82 // Filled by Prepare()
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83 std::vector<uint8_t*> rows_;
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84 int bitDepth_;
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85 int colorType_;
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86 };
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87
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88
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89
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90 PngWriter::PngWriter() : pimpl_(new PImpl)
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91 {
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92 pimpl_->png_ = NULL;
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93 pimpl_->info_ = NULL;
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94
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95 pimpl_->png_ = png_create_write_struct
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96 (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); //this, ErrorHandler, WarningHandler);
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97 if (!pimpl_->png_)
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98 {
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99 throw OrthancException(ErrorCode_NotEnoughMemory);
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100 }
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101
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102 pimpl_->info_ = png_create_info_struct(pimpl_->png_);
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103 if (!pimpl_->info_)
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104 {
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105 png_destroy_write_struct(&pimpl_->png_, NULL);
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106 throw OrthancException(ErrorCode_NotEnoughMemory);
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107 }
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108 }
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109
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110 PngWriter::~PngWriter()
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111 {
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112 if (pimpl_->info_)
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113 {
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114 png_destroy_info_struct(pimpl_->png_, &pimpl_->info_);
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115 }
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116
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117 if (pimpl_->png_)
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118 {
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119 png_destroy_write_struct(&pimpl_->png_, NULL);
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120 }
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121 }
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122
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123
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124
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125 void PngWriter::Prepare(unsigned int width,
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126 unsigned int height,
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127 unsigned int pitch,
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128 PixelFormat format,
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129 const void* buffer)
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130 {
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131 pimpl_->rows_.resize(height);
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132 for (unsigned int y = 0; y < height; y++)
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133 {
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134 pimpl_->rows_[y] = const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(buffer)) + y * pitch;
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135 }
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136
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137 switch (format)
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138 {
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139 case PixelFormat_RGB24:
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140 pimpl_->bitDepth_ = 8;
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141 pimpl_->colorType_ = PNG_COLOR_TYPE_RGB;
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142 break;
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143
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144 case PixelFormat_RGBA32:
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145 pimpl_->bitDepth_ = 8;
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146 pimpl_->colorType_ = PNG_COLOR_TYPE_RGBA;
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147 break;
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148
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149 case PixelFormat_Grayscale8:
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150 pimpl_->bitDepth_ = 8;
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151 pimpl_->colorType_ = PNG_COLOR_TYPE_GRAY;
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152 break;
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153
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154 case PixelFormat_Grayscale16:
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155 case PixelFormat_SignedGrayscale16:
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156 pimpl_->bitDepth_ = 16;
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157 pimpl_->colorType_ = PNG_COLOR_TYPE_GRAY;
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158 break;
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159
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160 default:
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161 throw OrthancException(ErrorCode_NotImplemented);
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162 }
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163 }
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164
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165
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166 void PngWriter::Compress(unsigned int width,
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167 unsigned int height,
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168 unsigned int pitch,
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169 PixelFormat format)
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170 {
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171 png_set_IHDR(pimpl_->png_, pimpl_->info_, width, height,
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172 pimpl_->bitDepth_, pimpl_->colorType_, PNG_INTERLACE_NONE,
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173 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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174
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175 png_write_info(pimpl_->png_, pimpl_->info_);
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176
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177 if (height > 0)
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178 {
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179 switch (format)
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180 {
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181 case PixelFormat_Grayscale16:
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182 case PixelFormat_SignedGrayscale16:
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183 {
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184 int transforms = 0;
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185 if (Toolbox::DetectEndianness() == Endianness_Little)
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186 {
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187 transforms = PNG_TRANSFORM_SWAP_ENDIAN;
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188 }
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189
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190 png_set_rows(pimpl_->png_, pimpl_->info_, &pimpl_->rows_[0]);
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191 png_write_png(pimpl_->png_, pimpl_->info_, transforms, NULL);
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192
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193 break;
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194 }
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195
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196 default:
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197 png_write_image(pimpl_->png_, &pimpl_->rows_[0]);
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198 }
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199 }
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200
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201 png_write_end(pimpl_->png_, NULL);
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202 }
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203
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204
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205 void PngWriter::WriteToFile(const char* filename,
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206 unsigned int width,
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207 unsigned int height,
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208 unsigned int pitch,
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209 PixelFormat format,
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210 const void* buffer)
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211 {
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212 Prepare(width, height, pitch, format, buffer);
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213
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214 FILE* fp = fopen(filename, "wb");
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215 if (!fp)
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216 {
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217 throw OrthancException(ErrorCode_CannotWriteFile);
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218 }
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219
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220 png_init_io(pimpl_->png_, fp);
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221
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222 if (setjmp(png_jmpbuf(pimpl_->png_)))
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223 {
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224 // Error during writing PNG
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225 throw OrthancException(ErrorCode_CannotWriteFile);
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226 }
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227
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228 Compress(width, height, pitch, format);
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229
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230 fclose(fp);
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231 }
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232
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233
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234
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235
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236 static void MemoryCallback(png_structp png_ptr,
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237 png_bytep data,
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238 png_size_t size)
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239 {
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240 ChunkedBuffer* buffer = reinterpret_cast<ChunkedBuffer*>(png_get_io_ptr(png_ptr));
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241 buffer->AddChunk(reinterpret_cast<const char*>(data), size);
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242 }
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243
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244
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245
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246 void PngWriter::WriteToMemory(std::string& png,
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247 unsigned int width,
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248 unsigned int height,
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249 unsigned int pitch,
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250 PixelFormat format,
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251 const void* buffer)
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252 {
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253 ChunkedBuffer chunks;
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254
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255 Prepare(width, height, pitch, format, buffer);
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256
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257 if (setjmp(png_jmpbuf(pimpl_->png_)))
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258 {
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259 // Error during writing PNG
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260 throw OrthancException(ErrorCode_InternalError);
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261 }
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262
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263 png_set_write_fn(pimpl_->png_, &chunks, MemoryCallback, NULL);
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264
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265 Compress(width, height, pitch, format);
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266
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267 chunks.Flatten(png);
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268 }
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269 }
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