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annotate OrthancFramework/Sources/Images/PngWriter.cpp @ 5334:5b2a5cc64cb1

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 27 Jun 2023 15:12:39 +0200
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children 48b8dae6dc77
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2023 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2023 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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23
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24 #include "../PrecompiledHeaders.h"
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25 #include "PngWriter.h"
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27 #include <vector>
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28 #include <stdint.h>
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29 #include <png.h>
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30 #include "../OrthancException.h"
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31 #include "../ChunkedBuffer.h"
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32 #include "../Toolbox.h"
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33
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34 #if ORTHANC_SANDBOXED == 0
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35 # include "../SystemToolbox.h"
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36 #endif
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39 // http://www.libpng.org/pub/png/libpng-1.2.5-manual.html#section-4
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40 // http://zarb.org/~gc/html/libpng.html
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41 /*
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42 void write_row_callback(png_ptr, png_uint_32 row, int pass)
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43 {
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44 }*/
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49 /* bool isError_;
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51 // http://www.libpng.org/pub/png/book/chapter14.html#png.ch14.div.2
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53 static void ErrorHandler(png_structp png, png_const_charp message)
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54 {
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55 printf("** [%s]\n", message);
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56
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57 PngWriter* that = (PngWriter*) png_get_error_ptr(png);
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58 that->isError_ = true;
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59 printf("** %d\n", (int)that);
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61 //((PngWriter*) payload)->isError_ = true;
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62 }
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64 static void WarningHandler(png_structp png, png_const_charp message)
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65 {
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66 printf("++ %d\n", (int)message);
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67 }*/
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69
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70 namespace Orthanc
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71 {
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72 /**
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73 * The "png_" structure cannot be safely reused if the bpp changes
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74 * between successive invocations. This can lead to "Invalid reads"
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75 * reported by valgrind if writing a 16bpp image, then a 8bpp image
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76 * using the same "PngWriter" object. Starting with Orthanc 1.9.3,
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77 * we recreate a new "png_" context each time a PNG image must be
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78 * written so as to prevent such invalid reads.
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79 **/
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80 class PngWriter::Context : public boost::noncopyable
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81 {
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82 private:
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83 png_structp png_;
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84 png_infop info_;
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85
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86 // Filled by Prepare()
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87 std::vector<uint8_t*> rows_;
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88 int bitDepth_;
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89 int colorType_;
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90
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91 public:
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92 Context() :
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93 png_(NULL),
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94 info_(NULL),
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95 bitDepth_(0), // Dummy initialization
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96 colorType_(0) // Dummy initialization
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97 {
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98 png_ = png_create_write_struct
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99 (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); //this, ErrorHandler, WarningHandler);
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100 if (!png_)
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101 {
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102 throw OrthancException(ErrorCode_NotEnoughMemory);
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103 }
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104
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105 info_ = png_create_info_struct(png_);
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106 if (!info_)
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107 {
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108 png_destroy_write_struct(&png_, NULL);
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109 throw OrthancException(ErrorCode_NotEnoughMemory);
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110 }
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111 }
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112
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113
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114 ~Context()
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115 {
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116 if (info_)
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117 {
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118 png_destroy_info_struct(png_, &info_);
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119 }
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120
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121 if (png_)
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122 {
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123 png_destroy_write_struct(&png_, NULL);
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124 }
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125 }
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126
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127
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128 png_structp GetObject() const
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129 {
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130 return png_;
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131 }
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132
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133
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134 void Prepare(unsigned int width,
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135 unsigned int height,
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136 unsigned int pitch,
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137 PixelFormat format,
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138 const void* buffer)
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139 {
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140 rows_.resize(height);
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141 for (unsigned int y = 0; y < height; y++)
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142 {
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143 rows_[y] = const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(buffer)) + y * pitch;
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144 }
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145
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146 switch (format)
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147 {
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148 case PixelFormat_RGB24:
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149 bitDepth_ = 8;
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150 colorType_ = PNG_COLOR_TYPE_RGB;
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151 break;
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152
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153 case PixelFormat_RGBA32:
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154 bitDepth_ = 8;
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155 colorType_ = PNG_COLOR_TYPE_RGBA;
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156 break;
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157
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158 case PixelFormat_Grayscale8:
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159 bitDepth_ = 8;
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160 colorType_ = PNG_COLOR_TYPE_GRAY;
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161 break;
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162
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163 case PixelFormat_Grayscale16:
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164 case PixelFormat_SignedGrayscale16:
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165 bitDepth_ = 16;
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166 colorType_ = PNG_COLOR_TYPE_GRAY;
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167 break;
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168
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169 case PixelFormat_RGBA64:
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170 bitDepth_ = 16;
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171 colorType_ = PNG_COLOR_TYPE_RGBA;
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172 break;
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173
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174 default:
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175 throw OrthancException(ErrorCode_NotImplemented);
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176 }
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177 }
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178
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179
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180 void Compress(unsigned int width,
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181 unsigned int height,
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182 unsigned int pitch,
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183 PixelFormat format)
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184 {
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185 png_set_IHDR(png_, info_, width, height,
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186 bitDepth_, colorType_, PNG_INTERLACE_NONE,
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187 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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188
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189 png_write_info(png_, info_);
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190
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191 if (height > 0)
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192 {
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193 switch (format)
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194 {
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195 case PixelFormat_Grayscale16:
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196 case PixelFormat_SignedGrayscale16:
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197 case PixelFormat_RGBA64:
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198 {
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199 int transforms = 0;
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200 if (Toolbox::DetectEndianness() == Endianness_Little)
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201 {
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202 transforms = PNG_TRANSFORM_SWAP_ENDIAN;
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203 }
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204
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205 png_set_rows(png_, info_, &rows_[0]);
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206 png_write_png(png_, info_, transforms, NULL);
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207
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208 break;
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209 }
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210
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211 default:
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212 png_write_image(png_, &rows_[0]);
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213 }
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214 }
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215
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216 png_write_end(png_, NULL);
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217 }
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218 };
0
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219
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220
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221 #if ORTHANC_SANDBOXED == 0
1916
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222 void PngWriter::WriteToFileInternal(const std::string& filename,
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223 unsigned int width,
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224 unsigned int height,
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225 unsigned int pitch,
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226 PixelFormat format,
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227 const void* buffer)
0
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228 {
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229 Context context;
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230
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231 context.Prepare(width, height, pitch, format, buffer);
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232
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233 FILE* fp = SystemToolbox::OpenFile(filename, FileMode_WriteBinary);
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234 if (!fp)
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235 {
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236 throw OrthancException(ErrorCode_CannotWriteFile);
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237 }
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238
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239 png_init_io(context.GetObject(), fp);
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240
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241 if (setjmp(png_jmpbuf(context.GetObject())))
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242 {
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243 // Error during writing PNG
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244 throw OrthancException(ErrorCode_CannotWriteFile);
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245 }
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246
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247 context.Compress(width, height, pitch, format);
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248
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249 fclose(fp);
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250 }
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251 #endif
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252
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253
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254 static void MemoryCallback(png_structp png_ptr,
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255 png_bytep data,
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256 png_size_t size)
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257 {
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258 ChunkedBuffer* buffer = reinterpret_cast<ChunkedBuffer*>(png_get_io_ptr(png_ptr));
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259 buffer->AddChunk(data, size);
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260 }
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261
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262
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263 void PngWriter::WriteToMemoryInternal(std::string& png,
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264 unsigned int width,
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265 unsigned int height,
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266 unsigned int pitch,
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267 PixelFormat format,
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268 const void* buffer)
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269 {
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270 Context context;
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271
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272 ChunkedBuffer chunks;
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273
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274 context.Prepare(width, height, pitch, format, buffer);
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275
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276 if (setjmp(png_jmpbuf(context.GetObject())))
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277 {
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278 // Error during writing PNG
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279 throw OrthancException(ErrorCode_InternalError);
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280 }
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281
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282 png_set_write_fn(context.GetObject(), &chunks, MemoryCallback, NULL);
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283
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284 context.Compress(width, height, pitch, format);
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285
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286 chunks.Flatten(png);
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287 }
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288 }