Mercurial > hg > orthanc

annotate Core/Images/PamWriter.cpp @ 3377:05881bf99c83

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Allow the serialization of signed 16bpp images in PAM format
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 16 May 2019 12:31:47 +0200
parents 4e43e67f8ecf
children 94f4a18a79cc
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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) 2017-2019 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 General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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32
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33
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34 #include "../PrecompiledHeaders.h"
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35 #include "PamWriter.h"
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36
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37 #include "../Endianness.h"
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38 #include "../OrthancException.h"
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39 #include "../Toolbox.h"
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40
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41 #include <boost/lexical_cast.hpp>
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42
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43
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44 namespace Orthanc
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45 {
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46 static void GetPixelFormatInfo(const PixelFormat& format,
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47 unsigned int& maxValue,
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48 unsigned int& channelCount,
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49 unsigned int& bytesPerChannel,
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50 std::string& tupleType)
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51 {
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52 switch (format)
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53 {
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54 case PixelFormat_Grayscale8:
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55 maxValue = 255;
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56 channelCount = 1;
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57 bytesPerChannel = 1;
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58 tupleType = "GRAYSCALE";
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59 break;
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60
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61 case PixelFormat_SignedGrayscale16:
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62 case PixelFormat_Grayscale16:
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63 maxValue = 65535;
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64 channelCount = 1;
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65 bytesPerChannel = 2;
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66 tupleType = "GRAYSCALE";
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67 break;
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68
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69 case PixelFormat_RGB24:
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70 maxValue = 255;
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71 channelCount = 3;
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72 bytesPerChannel = 1;
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73 tupleType = "RGB";
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74 break;
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75
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76 case PixelFormat_RGB48:
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77 maxValue = 255;
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78 channelCount = 3;
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79 bytesPerChannel = 2;
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80 tupleType = "RGB";
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81 break;
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82
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83 default:
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84 throw OrthancException(ErrorCode_NotImplemented);
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85 }
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86 }
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87
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88
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89 void PamWriter::WriteToMemoryInternal(std::string& target,
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90 unsigned int width,
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91 unsigned int height,
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92 unsigned int sourcePitch,
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93 PixelFormat format,
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94 const void* buffer)
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95 {
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96 unsigned int maxValue, channelCount, bytesPerChannel;
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97 std::string tupleType;
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98 GetPixelFormatInfo(format, maxValue, channelCount, bytesPerChannel, tupleType);
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99
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100 target = (std::string("P7") +
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101 std::string("\nWIDTH ") + boost::lexical_cast<std::string>(width) +
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102 std::string("\nHEIGHT ") + boost::lexical_cast<std::string>(height) +
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103 std::string("\nDEPTH ") + boost::lexical_cast<std::string>(channelCount) +
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104 std::string("\nMAXVAL ") + boost::lexical_cast<std::string>(maxValue) +
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105 std::string("\nTUPLTYPE ") + tupleType +
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106 std::string("\nENDHDR\n"));
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107
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108 if (bytesPerChannel != 1 &&
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109 bytesPerChannel != 2)
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110 {
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111 throw OrthancException(ErrorCode_NotImplemented);
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112 }
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113
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114 size_t targetPitch = channelCount * bytesPerChannel * width;
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115 size_t offset = target.size();
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116
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117 target.resize(offset + targetPitch * height);
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118
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119 assert(target.size() != 0);
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120
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121 if (Toolbox::DetectEndianness() == Endianness_Little &&
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122 bytesPerChannel == 2)
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123 {
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124 // Byte swapping
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125 for (unsigned int h = 0; h < height; ++h)
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126 {
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127 const uint16_t* p = reinterpret_cast<const uint16_t*>
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128 (reinterpret_cast<const uint8_t*>(buffer) + h * sourcePitch);
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129 uint16_t* q = reinterpret_cast<uint16_t*>
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130 (reinterpret_cast<uint8_t*>(&target[offset]) + h * targetPitch);
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131
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132 for (unsigned int w = 0; w < width * channelCount; ++w)
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133 {
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134 // memcpy() is necessary to avoid segmentation fault if the
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135 // "pixel" pointer is not 16-bit aligned (which is the case
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136 // if "offset" is an odd number). Check out issue #99:
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137 // https://bitbucket.org/sjodogne/orthanc/issues/99
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138 uint16_t v = htobe16(*p);
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139 memcpy(q, &v, sizeof(uint16_t));
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140
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141 p++;
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142 q++;
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143 }
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144 }
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145 }
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146 else
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147 {
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148 // Either "bytesPerChannel == 1" (and endianness is not
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149 // relevant), or we run on a big endian architecture (and no
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150 // byte swapping is necessary, as PAM uses big endian)
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151
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152 for (unsigned int h = 0; h < height; ++h)
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153 {
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154 const void* p = reinterpret_cast<const uint8_t*>(buffer) + h * sourcePitch;
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155 void* q = reinterpret_cast<uint8_t*>(&target[offset]) + h * targetPitch;
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156 memcpy(q, p, targetPitch);
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157 }
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158 }
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am@osimis.io
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159 }
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160 }