746
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1 /**
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2 * Stone of Orthanc
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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 Affero 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 * Affero 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 Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "GetOrthancWebViewerJpegCommand.h"
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23
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24 #include "../Toolbox/LinearAlgebra.h"
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25
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26 #include <Core/Images/Image.h>
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27 #include <Core/Images/ImageProcessing.h>
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28 #include <Core/Images/JpegReader.h>
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29 #include <Core/OrthancException.h>
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30 #include <Core/Toolbox.h>
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31
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32 #include <json/reader.h>
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33 #include <json/value.h>
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34
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35 namespace OrthancStone
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36 {
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37 GetOrthancWebViewerJpegCommand::SuccessMessage::SuccessMessage(const GetOrthancWebViewerJpegCommand& command,
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38 Orthanc::ImageAccessor* image) : // Takes ownership
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39 OriginMessage(command),
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40 image_(image)
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41 {
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42 if (image == NULL)
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43 {
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44 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
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45 }
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46 }
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47
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48
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49 GetOrthancWebViewerJpegCommand::GetOrthancWebViewerJpegCommand() :
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50 frame_(0),
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51 quality_(95),
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52 timeout_(10),
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53 expectedFormat_(Orthanc::PixelFormat_Grayscale8)
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54 {
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55 }
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56
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57
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58 void GetOrthancWebViewerJpegCommand::SetQuality(unsigned int quality)
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59 {
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60 if (quality <= 0 ||
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61 quality > 100)
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62 {
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63 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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64 }
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65 else
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66 {
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67 quality_ = quality;
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68 }
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69 }
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70
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71
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72 std::string GetOrthancWebViewerJpegCommand::GetUri() const
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73 {
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74 return ("/web-viewer/instances/jpeg" + boost::lexical_cast<std::string>(quality_) +
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75 "-" + instanceId_ + "_" + boost::lexical_cast<std::string>(frame_));
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76 }
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77
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78
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79 void GetOrthancWebViewerJpegCommand::ProcessHttpAnswer(IMessageEmitter& emitter,
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80 const IObserver& receiver,
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81 const std::string& answer) const
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82 {
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83 // This code comes from older "OrthancSlicesLoader::ParseSliceImageJpeg()"
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84
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85 Json::Value encoded;
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86
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87 {
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88 Json::Reader reader;
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89 if (!reader.parse(answer, encoded))
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90 {
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91 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
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92 }
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93 }
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94
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95 if (encoded.type() != Json::objectValue ||
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96 !encoded.isMember("Orthanc") ||
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97 encoded["Orthanc"].type() != Json::objectValue)
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98 {
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99 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
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100 }
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101
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102 const Json::Value& info = encoded["Orthanc"];
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103 if (!info.isMember("PixelData") ||
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104 !info.isMember("Stretched") ||
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105 !info.isMember("Compression") ||
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106 info["Compression"].type() != Json::stringValue ||
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107 info["PixelData"].type() != Json::stringValue ||
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108 info["Stretched"].type() != Json::booleanValue ||
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109 info["Compression"].asString() != "Jpeg")
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110 {
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111 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
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112 }
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113
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114 bool isSigned = false;
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115 bool isStretched = info["Stretched"].asBool();
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116
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117 if (info.isMember("IsSigned"))
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118 {
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119 if (info["IsSigned"].type() != Json::booleanValue)
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120 {
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121 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
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122 }
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123 else
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124 {
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125 isSigned = info["IsSigned"].asBool();
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126 }
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127 }
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128
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129 std::auto_ptr<Orthanc::ImageAccessor> reader;
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130
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131 {
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132 std::string jpeg;
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133 Orthanc::Toolbox::DecodeBase64(jpeg, info["PixelData"].asString());
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134
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135 reader.reset(new Orthanc::JpegReader);
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136 dynamic_cast<Orthanc::JpegReader&>(*reader).ReadFromMemory(jpeg);
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137 }
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138
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139 if (reader->GetFormat() == Orthanc::PixelFormat_RGB24) // This is a color image
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140 {
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141 if (expectedFormat_ != Orthanc::PixelFormat_RGB24)
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142 {
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143 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
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144 }
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145
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146 if (isSigned || isStretched)
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147 {
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148 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
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149 }
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150 else
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151 {
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152 SuccessMessage message(*this, reader.release());
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153 emitter.EmitMessage(receiver, message);
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154 return;
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155 }
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156 }
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157
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158 if (reader->GetFormat() != Orthanc::PixelFormat_Grayscale8)
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159 {
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160 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
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161 }
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162
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163 if (!isStretched)
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164 {
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165 if (expectedFormat_ != reader->GetFormat())
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166 {
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167 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
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168 }
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169 else
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170 {
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171 SuccessMessage message(*this, reader.release());
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172 emitter.EmitMessage(receiver, message);
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173 return;
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174 }
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175 }
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176
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177 int32_t stretchLow = 0;
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178 int32_t stretchHigh = 0;
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179
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180 if (!info.isMember("StretchLow") ||
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181 !info.isMember("StretchHigh") ||
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182 info["StretchLow"].type() != Json::intValue ||
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183 info["StretchHigh"].type() != Json::intValue)
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184 {
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185 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
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186 }
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187
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188 stretchLow = info["StretchLow"].asInt();
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189 stretchHigh = info["StretchHigh"].asInt();
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190
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191 if (stretchLow < -32768 ||
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192 stretchHigh > 65535 ||
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193 (stretchLow < 0 && stretchHigh > 32767))
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194 {
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195 // This range cannot be represented with a uint16_t or an int16_t
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196 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadFileFormat);
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197 }
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198
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199 // Decode a grayscale JPEG 8bpp image coming from the Web viewer
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200 std::auto_ptr<Orthanc::ImageAccessor> image
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201 (new Orthanc::Image(expectedFormat_, reader->GetWidth(), reader->GetHeight(), false));
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202
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203 Orthanc::ImageProcessing::Convert(*image, *reader);
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204 reader.reset();
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205
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206 float scaling = static_cast<float>(stretchHigh - stretchLow) / 255.0f;
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207
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208 if (!LinearAlgebra::IsCloseToZero(scaling))
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209 {
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210 float offset = static_cast<float>(stretchLow) / scaling;
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211 Orthanc::ImageProcessing::ShiftScale(*image, offset, scaling, true);
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212 }
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213
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214 SuccessMessage message(*this, image.release());
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215 emitter.EmitMessage(receiver, message);
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216 }
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217 }
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