Mercurial > hg > orthanc
annotate OrthancFramework/Sources/Images/PamWriter.cpp @ 4201:2d5209153b32
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 17 Sep 2020 08:18:28 +0200 |
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children | b96aedfa8cc1 |
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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) 2017-2020 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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21 |
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22 |
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23 #include "../PrecompiledHeaders.h" |
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24 #include "PamWriter.h" |
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25 |
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27 #include "../OrthancException.h" | |
28 #include "../Toolbox.h" | |
29 | |
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30 #include <boost/lexical_cast.hpp> |
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31 |
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32 |
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33 namespace Orthanc |
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34 { |
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35 static void GetPixelFormatInfo(const PixelFormat& format, |
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36 unsigned int& maxValue, |
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37 unsigned int& channelCount, |
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38 unsigned int& bytesPerChannel, |
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39 std::string& tupleType) |
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40 { |
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41 switch (format) |
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42 { |
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43 case PixelFormat_Grayscale8: |
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44 maxValue = 255; |
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45 channelCount = 1; |
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46 bytesPerChannel = 1; |
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47 tupleType = "GRAYSCALE"; |
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48 break; |
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49 |
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50 case PixelFormat_SignedGrayscale16: |
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51 case PixelFormat_Grayscale16: |
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52 maxValue = 65535; |
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53 channelCount = 1; |
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54 bytesPerChannel = 2; |
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55 tupleType = "GRAYSCALE"; |
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56 break; |
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57 |
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58 case PixelFormat_RGB24: |
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59 maxValue = 255; |
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60 channelCount = 3; |
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61 bytesPerChannel = 1; |
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62 tupleType = "RGB"; |
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63 break; |
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64 |
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65 case PixelFormat_RGB48: |
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66 maxValue = 255; |
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67 channelCount = 3; |
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68 bytesPerChannel = 2; |
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69 tupleType = "RGB"; |
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70 break; |
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71 |
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72 default: |
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73 throw OrthancException(ErrorCode_NotImplemented); |
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74 } |
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75 } |
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76 |
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77 |
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78 void PamWriter::WriteToMemoryInternal(std::string& target, |
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79 unsigned int width, |
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80 unsigned int height, |
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81 unsigned int sourcePitch, |
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82 PixelFormat format, |
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83 const void* buffer) |
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84 { |
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85 unsigned int maxValue, channelCount, bytesPerChannel; |
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86 std::string tupleType; |
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87 GetPixelFormatInfo(format, maxValue, channelCount, bytesPerChannel, tupleType); |
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88 |
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89 target = (std::string("P7") + |
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90 std::string("\nWIDTH ") + boost::lexical_cast<std::string>(width) + |
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91 std::string("\nHEIGHT ") + boost::lexical_cast<std::string>(height) + |
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92 std::string("\nDEPTH ") + boost::lexical_cast<std::string>(channelCount) + |
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93 std::string("\nMAXVAL ") + boost::lexical_cast<std::string>(maxValue) + |
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94 std::string("\nTUPLTYPE ") + tupleType + |
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95 std::string("\nENDHDR\n")); |
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96 |
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97 if (bytesPerChannel != 1 && |
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98 bytesPerChannel != 2) |
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99 { |
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100 throw OrthancException(ErrorCode_NotImplemented); |
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101 } |
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102 |
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103 size_t targetPitch = channelCount * bytesPerChannel * width; |
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104 size_t offset = target.size(); |
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105 |
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106 target.resize(offset + targetPitch * height); |
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107 |
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108 assert(target.size() != 0); |
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109 |
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110 if (Toolbox::DetectEndianness() == Endianness_Little && |
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111 bytesPerChannel == 2) |
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112 { |
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113 // Byte swapping |
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114 for (unsigned int h = 0; h < height; ++h) |
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115 { |
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116 const uint16_t* p = reinterpret_cast<const uint16_t*> |
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117 (reinterpret_cast<const uint8_t*>(buffer) + h * sourcePitch); |
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118 uint16_t* q = reinterpret_cast<uint16_t*> |
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119 (reinterpret_cast<uint8_t*>(&target[offset]) + h * targetPitch); |
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120 |
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121 for (unsigned int w = 0; w < width * channelCount; ++w) |
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122 { |
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123 // memcpy() is necessary to avoid segmentation fault if the |
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124 // "pixel" pointer is not 16-bit aligned (which is the case |
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125 // if "offset" is an odd number). Check out issue #99: |
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126 // https://bitbucket.org/sjodogne/orthanc/issues/99 |
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127 uint16_t v = htobe16(*p); |
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128 memcpy(q, &v, sizeof(uint16_t)); |
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129 |
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130 p++; |
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131 q++; |
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132 } |
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133 } |
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134 } |
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135 else |
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136 { |
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137 // Either "bytesPerChannel == 1" (and endianness is not |
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138 // relevant), or we run on a big endian architecture (and no |
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139 // byte swapping is necessary, as PAM uses big endian) |
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140 |
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141 for (unsigned int h = 0; h < height; ++h) |
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142 { |
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143 const void* p = reinterpret_cast<const uint8_t*>(buffer) + h * sourcePitch; |
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144 void* q = reinterpret_cast<uint8_t*>(&target[offset]) + h * targetPitch; |
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145 memcpy(q, p, targetPitch); |
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146 } |
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147 } |
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148 } |
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149 } |