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annotate OrthancFramework/Sources/Images/PngWriter.cpp @ 4642:69bbb4bd35cb

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PngWriter recreates a new libpng context for each encoding
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 28 Apr 2021 11:22:39 +0200
parents d9473bd5ed43
children e8967149d87a
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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) 2017-2021 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with this program. If not, see
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19 * <http://www.gnu.org/licenses/>.
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20 **/
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22
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23 #include "../PrecompiledHeaders.h"
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24 #include "PngWriter.h"
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26 #include <vector>
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27 #include <stdint.h>
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28 #include <png.h>
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29 #include "../OrthancException.h"
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30 #include "../ChunkedBuffer.h"
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31 #include "../Toolbox.h"
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33 #if ORTHANC_SANDBOXED == 0
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34 # include "../SystemToolbox.h"
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35 #endif
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38 // http://www.libpng.org/pub/png/libpng-1.2.5-manual.html#section-4
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39 // http://zarb.org/~gc/html/libpng.html
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40 /*
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41 void write_row_callback(png_ptr, png_uint_32 row, int pass)
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42 {
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43 }*/
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48 /* bool isError_;
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50 // http://www.libpng.org/pub/png/book/chapter14.html#png.ch14.div.2
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52 static void ErrorHandler(png_structp png, png_const_charp message)
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53 {
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54 printf("** [%s]\n", message);
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55
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56 PngWriter* that = (PngWriter*) png_get_error_ptr(png);
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57 that->isError_ = true;
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58 printf("** %d\n", (int)that);
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60 //((PngWriter*) payload)->isError_ = true;
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61 }
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63 static void WarningHandler(png_structp png, png_const_charp message)
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64 {
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65 printf("++ %d\n", (int)message);
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66 }*/
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68
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69 namespace Orthanc
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70 {
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71 /**
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72 * The "png_" structure cannot be safely reused if the bpp changes
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73 * between successive invocations. This can lead to "Invalid reads"
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74 * reported by valgrind if writing a 16bpp image, then a 8bpp image
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75 * using the same "PngWriter" object. Starting with Orthanc 1.9.3,
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76 * we recreate a new "png_" context each time a PNG image must be
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77 * written so as to prevent such invalid reads.
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78 **/
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79 class PngWriter::Context : public boost::noncopyable
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80 {
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81 private:
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82 png_structp png_;
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83 png_infop info_;
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84
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85 // Filled by Prepare()
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86 std::vector<uint8_t*> rows_;
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87 int bitDepth_;
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88 int colorType_;
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89
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90 public:
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91 Context() :
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92 png_(NULL),
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93 info_(NULL)
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94 {
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95 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 (!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 info_ = png_create_info_struct(png_);
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103 if (!info_)
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104 {
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105 png_destroy_write_struct(&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
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111 ~Context()
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112 {
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113 if (info_)
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114 {
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115 png_destroy_info_struct(png_, &info_);
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116 }
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117
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118 if (png_)
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119 {
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120 png_destroy_write_struct(&png_, NULL);
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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 png_structp GetObject() const
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126 {
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127 return png_;
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128 }
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129
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130
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131 void Prepare(unsigned int width,
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132 unsigned int height,
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133 unsigned int pitch,
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134 PixelFormat format,
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135 const void* buffer)
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136 {
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137 rows_.resize(height);
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138 for (unsigned int y = 0; y < height; y++)
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139 {
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140 rows_[y] = const_cast<uint8_t*>(reinterpret_cast<const uint8_t*>(buffer)) + y * pitch;
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141 }
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142
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143 switch (format)
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144 {
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145 case PixelFormat_RGB24:
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146 bitDepth_ = 8;
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147 colorType_ = PNG_COLOR_TYPE_RGB;
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148 break;
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149
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150 case PixelFormat_RGBA32:
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151 bitDepth_ = 8;
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152 colorType_ = PNG_COLOR_TYPE_RGBA;
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153 break;
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154
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155 case PixelFormat_Grayscale8:
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156 bitDepth_ = 8;
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157 colorType_ = PNG_COLOR_TYPE_GRAY;
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158 break;
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159
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160 case PixelFormat_Grayscale16:
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161 case PixelFormat_SignedGrayscale16:
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162 bitDepth_ = 16;
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163 colorType_ = PNG_COLOR_TYPE_GRAY;
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164 break;
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165
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166 default:
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167 throw OrthancException(ErrorCode_NotImplemented);
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168 }
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169 }
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170
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171
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172 void Compress(unsigned int width,
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173 unsigned int height,
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174 unsigned int pitch,
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175 PixelFormat format)
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176 {
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177 png_set_IHDR(png_, info_, width, height,
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178 bitDepth_, colorType_, PNG_INTERLACE_NONE,
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179 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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180
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181 png_write_info(png_, info_);
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182
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183 if (height > 0)
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184 {
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185 switch (format)
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186 {
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187 case PixelFormat_Grayscale16:
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188 case PixelFormat_SignedGrayscale16:
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189 {
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190 int transforms = 0;
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191 if (Toolbox::DetectEndianness() == Endianness_Little)
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192 {
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193 transforms = PNG_TRANSFORM_SWAP_ENDIAN;
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194 }
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195
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196 png_set_rows(png_, info_, &rows_[0]);
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197 png_write_png(png_, info_, transforms, NULL);
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198
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199 break;
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200 }
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201
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202 default:
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203 png_write_image(png_, &rows_[0]);
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204 }
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205 }
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206
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207 png_write_end(png_, NULL);
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208 }
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209 };
0
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210
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211
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212 #if ORTHANC_SANDBOXED == 0
1916
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213 void PngWriter::WriteToFileInternal(const std::string& filename,
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214 unsigned int width,
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215 unsigned int height,
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216 unsigned int pitch,
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217 PixelFormat format,
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218 const void* buffer)
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219 {
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220 Context context;
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221
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222 context.Prepare(width, height, pitch, format, buffer);
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223
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224 FILE* fp = SystemToolbox::OpenFile(filename, FileMode_WriteBinary);
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225 if (!fp)
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226 {
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227 throw OrthancException(ErrorCode_CannotWriteFile);
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228 }
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229
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230 png_init_io(context.GetObject(), fp);
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231
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232 if (setjmp(png_jmpbuf(context.GetObject())))
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233 {
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234 // Error during writing PNG
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235 throw OrthancException(ErrorCode_CannotWriteFile);
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236 }
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237
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238 context.Compress(width, height, pitch, format);
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239
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240 fclose(fp);
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241 }
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242 #endif
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243
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244
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245 static void MemoryCallback(png_structp png_ptr,
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246 png_bytep data,
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247 png_size_t size)
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248 {
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249 ChunkedBuffer* buffer = reinterpret_cast<ChunkedBuffer*>(png_get_io_ptr(png_ptr));
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250 buffer->AddChunk(data, size);
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251 }
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252
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253
1916
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254 void PngWriter::WriteToMemoryInternal(std::string& png,
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255 unsigned int width,
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parents: 1900
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256 unsigned int height,
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parents: 1900
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257 unsigned int pitch,
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258 PixelFormat format,
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259 const void* buffer)
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260 {
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261 Context context;
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262
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263 ChunkedBuffer chunks;
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264
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265 context.Prepare(width, height, pitch, format, buffer);
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266
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267 if (setjmp(png_jmpbuf(context.GetObject())))
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268 {
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269 // Error during writing PNG
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270 throw OrthancException(ErrorCode_InternalError);
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271 }
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273 png_set_write_fn(context.GetObject(), &chunks, MemoryCallback, NULL);
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275 context.Compress(width, height, pitch, format);
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277 chunks.Flatten(png);
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278 }
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279 }