Mercurial > hg > orthanc

annotate OrthancFramework/Sources/Images/PamWriter.cpp @ 4831:7053502fbf97

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added copyright UCLouvain
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 25 Nov 2021 19:01:11 +0100
parents d9473bd5ed43
children 43e613a7756b
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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 * Copyright (C) 2021-2021 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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22
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23
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24 #include "../PrecompiledHeaders.h"
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25 #include "PamWriter.h"
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26
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27 #include "../Endianness.h"
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28 #include "../OrthancException.h"
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29 #include "../Toolbox.h"
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30
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31 #include <boost/lexical_cast.hpp>
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32
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33
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34 namespace Orthanc
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35 {
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36 static void GetPixelFormatInfo(const PixelFormat& format,
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37 unsigned int& maxValue,
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38 unsigned int& channelCount,
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39 unsigned int& bytesPerChannel,
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40 std::string& tupleType)
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41 {
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42 switch (format)
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43 {
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44 case PixelFormat_Grayscale8:
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45 maxValue = 255;
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46 channelCount = 1;
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47 bytesPerChannel = 1;
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48 tupleType = "GRAYSCALE";
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49 break;
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50
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51 case PixelFormat_SignedGrayscale16:
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52 case PixelFormat_Grayscale16:
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53 maxValue = 65535;
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54 channelCount = 1;
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55 bytesPerChannel = 2;
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56 tupleType = "GRAYSCALE";
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57 break;
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58
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59 case PixelFormat_RGB24:
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60 maxValue = 255;
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61 channelCount = 3;
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62 bytesPerChannel = 1;
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63 tupleType = "RGB";
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64 break;
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65
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66 case PixelFormat_RGB48:
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67 maxValue = 255;
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68 channelCount = 3;
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69 bytesPerChannel = 2;
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70 tupleType = "RGB";
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71 break;
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72
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73 default:
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74 throw OrthancException(ErrorCode_NotImplemented);
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75 }
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76 }
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77
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78
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79 void PamWriter::WriteToMemoryInternal(std::string& target,
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80 unsigned int width,
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81 unsigned int height,
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82 unsigned int sourcePitch,
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83 PixelFormat format,
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84 const void* buffer)
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85 {
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86 unsigned int maxValue, channelCount, bytesPerChannel;
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87 std::string tupleType;
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88 GetPixelFormatInfo(format, maxValue, channelCount, bytesPerChannel, tupleType);
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89
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90 target = (std::string("P7") +
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91 std::string("\nWIDTH ") + boost::lexical_cast<std::string>(width) +
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92 std::string("\nHEIGHT ") + boost::lexical_cast<std::string>(height) +
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93 std::string("\nDEPTH ") + boost::lexical_cast<std::string>(channelCount) +
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94 std::string("\nMAXVAL ") + boost::lexical_cast<std::string>(maxValue) +
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95 std::string("\nTUPLTYPE ") + tupleType +
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96 std::string("\nENDHDR\n"));
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97
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98 if (bytesPerChannel != 1 &&
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99 bytesPerChannel != 2)
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100 {
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101 throw OrthancException(ErrorCode_NotImplemented);
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102 }
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103
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104 size_t targetPitch = channelCount * bytesPerChannel * width;
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105 size_t offset = target.size();
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106
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107 target.resize(offset + targetPitch * height);
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108
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109 assert(target.size() != 0);
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110
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111 if (Toolbox::DetectEndianness() == Endianness_Little &&
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112 bytesPerChannel == 2)
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113 {
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114 // Byte swapping
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115 for (unsigned int h = 0; h < height; ++h)
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116 {
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117 const uint16_t* p = reinterpret_cast<const uint16_t*>
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118 (reinterpret_cast<const uint8_t*>(buffer) + h * sourcePitch);
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119 uint16_t* q = reinterpret_cast<uint16_t*>
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120 (reinterpret_cast<uint8_t*>(&target[offset]) + h * targetPitch);
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121
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122 for (unsigned int w = 0; w < width * channelCount; ++w)
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123 {
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124 /**
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125 * This is Little-Endian computer, and PAM uses
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126 * Big-Endian. Need to do a 16-bit swap. We DON'T use
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127 * "htobe16()", as the latter only works if the "pixel"
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128 * pointer is 16-bit aligned (which is not the case if
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129 * "offset" is an odd number), and the trick that was used
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130 * in Orthanc <= 1.8.0 (i.e. make a "memcpy()" to a local
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131 * uint16_t variable) doesn't seem work for WebAssembly. We
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132 * thus use a plain old C implementation. Check out issue
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133 * #99: https://bugs.orthanc-server.com/show_bug.cgi?id=99
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134 **/
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135 const uint8_t* a = reinterpret_cast<const uint8_t*>(p);
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136 uint8_t* b = reinterpret_cast<uint8_t*>(q);
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137 b[0] = a[1];
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138 b[1] = a[0];
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139
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140 p++;
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141 q++;
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142 }
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143 }
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144 }
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145 else
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146 {
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147 // Either "bytesPerChannel == 1" (and endianness is not
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148 // relevant), or we run on a big endian architecture (and no
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149 // byte swapping is necessary, as PAM uses big endian)
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150
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151 for (unsigned int h = 0; h < height; ++h)
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152 {
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153 const void* p = reinterpret_cast<const uint8_t*>(buffer) + h * sourcePitch;
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154 void* q = reinterpret_cast<uint8_t*>(&target[offset]) + h * targetPitch;
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155 memcpy(q, p, targetPitch);
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156 }
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157 }
2699
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158 }
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159 }