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annotate OrthancFramework/Sources/Images/PngWriter.cpp @ 5751:5d78e5cafabc find-refactoring tip

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author Alain Mazy <am@orthanc.team>
date Tue, 03 Sep 2024 11:09:49 +0200
parents f7adfb22e20e
children
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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) 2024-2024 Orthanc Team SRL, Belgium
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7 * Copyright (C) 2021-2024 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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8 *
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9 * This program is free software: you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public License
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11 * as published by the Free Software Foundation, either version 3 of
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12 * the License, or (at your option) any later version.
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13 *
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14 * This program is distributed in the hope that it will be useful, but
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 * Lesser General Public License for more details.
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18 *
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19 * You should have received a copy of the GNU Lesser General Public
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20 * License along with this program. If not, see
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21 * <http://www.gnu.org/licenses/>.
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22 **/
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24
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25 #include "../PrecompiledHeaders.h"
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26 #include "PngWriter.h"
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28 #include <vector>
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29 #include <stdint.h>
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30 #include <png.h>
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31 #include "../OrthancException.h"
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32 #include "../ChunkedBuffer.h"
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33 #include "../Toolbox.h"
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35 #if ORTHANC_SANDBOXED == 0
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36 # include "../SystemToolbox.h"
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37 #endif
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40 // http://www.libpng.org/pub/png/libpng-1.2.5-manual.html#section-4
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41 // http://zarb.org/~gc/html/libpng.html
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42 /*
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43 void write_row_callback(png_ptr, png_uint_32 row, int pass)
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44 {
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45 }*/
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50 /* bool isError_;
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52 // http://www.libpng.org/pub/png/book/chapter14.html#png.ch14.div.2
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54 static void ErrorHandler(png_structp png, png_const_charp message)
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55 {
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56 printf("** [%s]\n", message);
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57
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58 PngWriter* that = (PngWriter*) png_get_error_ptr(png);
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59 that->isError_ = true;
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60 printf("** %d\n", (int)that);
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61
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62 //((PngWriter*) payload)->isError_ = true;
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63 }
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64
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65 static void WarningHandler(png_structp png, png_const_charp message)
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66 {
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67 printf("++ %d\n", (int)message);
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68 }*/
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70
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71 namespace Orthanc
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72 {
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73 /**
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74 * The "png_" structure cannot be safely reused if the bpp changes
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75 * between successive invocations. This can lead to "Invalid reads"
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76 * reported by valgrind if writing a 16bpp image, then a 8bpp image
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77 * using the same "PngWriter" object. Starting with Orthanc 1.9.3,
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78 * we recreate a new "png_" context each time a PNG image must be
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79 * written so as to prevent such invalid reads.
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80 **/
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81 class PngWriter::Context : public boost::noncopyable
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82 {
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83 private:
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84 png_structp png_;
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85 png_infop info_;
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86
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87 // Filled by Prepare()
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88 std::vector<uint8_t*> rows_;
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89 int bitDepth_;
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90 int colorType_;
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91
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92 public:
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93 Context() :
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94 png_(NULL),
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95 info_(NULL),
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96 bitDepth_(0), // Dummy initialization
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97 colorType_(0) // Dummy initialization
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98 {
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99 png_ = png_create_write_struct
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100 (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); //this, ErrorHandler, WarningHandler);
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101 if (!png_)
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102 {
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103 throw OrthancException(ErrorCode_NotEnoughMemory);
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104 }
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105
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106 info_ = png_create_info_struct(png_);
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107 if (!info_)
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108 {
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109 png_destroy_write_struct(&png_, NULL);
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110 throw OrthancException(ErrorCode_NotEnoughMemory);
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111 }
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112 }
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113
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114
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115 ~Context()
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116 {
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117 if (info_)
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118 {
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119 png_destroy_info_struct(png_, &info_);
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120 }
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121
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122 if (png_)
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123 {
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124 png_destroy_write_struct(&png_, NULL);
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125 }
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126 }
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127
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128
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129 png_structp GetObject() const
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130 {
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131 return png_;
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132 }
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133
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134
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135 void Prepare(unsigned int width,
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136 unsigned int height,
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137 unsigned int pitch,
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138 PixelFormat format,
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139 const void* buffer)
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140 {
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141 rows_.resize(height);
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142 for (unsigned int y = 0; y < height; y++)
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143 {
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144 rows_[y] = const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(buffer)) + y * pitch;
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145 }
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146
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147 switch (format)
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148 {
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149 case PixelFormat_RGB24:
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150 bitDepth_ = 8;
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151 colorType_ = PNG_COLOR_TYPE_RGB;
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152 break;
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153
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154 case PixelFormat_RGBA32:
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155 bitDepth_ = 8;
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156 colorType_ = PNG_COLOR_TYPE_RGBA;
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157 break;
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158
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159 case PixelFormat_Grayscale8:
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160 bitDepth_ = 8;
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161 colorType_ = PNG_COLOR_TYPE_GRAY;
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162 break;
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163
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164 case PixelFormat_Grayscale16:
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165 case PixelFormat_SignedGrayscale16:
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166 bitDepth_ = 16;
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167 colorType_ = PNG_COLOR_TYPE_GRAY;
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168 break;
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169
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170 case PixelFormat_RGBA64:
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171 bitDepth_ = 16;
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172 colorType_ = PNG_COLOR_TYPE_RGBA;
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173 break;
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174
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175 default:
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176 throw OrthancException(ErrorCode_NotImplemented);
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177 }
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178 }
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179
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180
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181 void Compress(unsigned int width,
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182 unsigned int height,
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183 unsigned int pitch,
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184 PixelFormat format)
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185 {
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186 png_set_IHDR(png_, info_, width, height,
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187 bitDepth_, colorType_, PNG_INTERLACE_NONE,
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188 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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189
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190 png_write_info(png_, info_);
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191
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192 if (height > 0)
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193 {
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194 switch (format)
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195 {
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196 case PixelFormat_Grayscale16:
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197 case PixelFormat_SignedGrayscale16:
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198 case PixelFormat_RGBA64:
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199 {
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200 int transforms = 0;
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201 if (Toolbox::DetectEndianness() == Endianness_Little)
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202 {
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203 transforms = PNG_TRANSFORM_SWAP_ENDIAN;
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204 }
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205
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206 png_set_rows(png_, info_, &rows_[0]);
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207 png_write_png(png_, info_, transforms, NULL);
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208
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209 break;
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210 }
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211
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212 default:
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213 png_write_image(png_, &rows_[0]);
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214 }
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215 }
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216
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217 png_write_end(png_, NULL);
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218 }
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219 };
0
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220
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221
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222 #if ORTHANC_SANDBOXED == 0
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223 void PngWriter::WriteToFileInternal(const std::string& filename,
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224 unsigned int width,
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225 unsigned int height,
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226 unsigned int pitch,
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227 PixelFormat format,
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228 const void* buffer)
0
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229 {
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230 Context context;
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231
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232 context.Prepare(width, height, pitch, format, buffer);
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233
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234 FILE* fp = SystemToolbox::OpenFile(filename, FileMode_WriteBinary);
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235 if (!fp)
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236 {
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237 throw OrthancException(ErrorCode_CannotWriteFile);
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238 }
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239
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240 png_init_io(context.GetObject(), fp);
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241
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242 if (setjmp(png_jmpbuf(context.GetObject())))
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243 {
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244 // Error during writing PNG
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245 throw OrthancException(ErrorCode_CannotWriteFile);
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246 }
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247
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248 context.Compress(width, height, pitch, format);
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249
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250 fclose(fp);
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251 }
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252 #endif
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253
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254
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255 static void MemoryCallback(png_structp png_ptr,
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256 png_bytep data,
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257 png_size_t size)
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258 {
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259 ChunkedBuffer* buffer = reinterpret_cast<ChunkedBuffer*>(png_get_io_ptr(png_ptr));
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260 buffer->AddChunk(data, size);
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261 }
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262
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263
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264 void PngWriter::WriteToMemoryInternal(std::string& png,
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265 unsigned int width,
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266 unsigned int height,
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267 unsigned int pitch,
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268 PixelFormat format,
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269 const void* buffer)
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270 {
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271 Context context;
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272
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273 ChunkedBuffer chunks;
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274
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275 context.Prepare(width, height, pitch, format, buffer);
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276
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277 if (setjmp(png_jmpbuf(context.GetObject())))
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278 {
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279 // Error during writing PNG
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280 throw OrthancException(ErrorCode_InternalError);
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281 }
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282
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283 png_set_write_fn(context.GetObject(), &chunks, MemoryCallback, NULL);
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284
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285 context.Compress(width, height, pitch, format);
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286
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287 chunks.Flatten(png);
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288 }
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289 }