Mercurial > hg > orthanc

annotate Core/DicomFormat/DicomIntegerPixelAccessor.cpp @ 1490:596927722403

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 04 Aug 2015 14:04:48 +0200
parents 6e7e5ed91c2d
children b1291df2f780
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #include "../PrecompiledHeaders.h"
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34
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35 #ifndef NOMINMAX
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36 #define NOMINMAX
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37 #endif
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38
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39 #include "DicomIntegerPixelAccessor.h"
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40
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41 #include "../OrthancException.h"
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42 #include <boost/lexical_cast.hpp>
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43 #include <limits>
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44 #include <cassert>
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45 #include <stdio.h>
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46
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47 namespace Orthanc
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48 {
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49 DicomIntegerPixelAccessor::DicomIntegerPixelAccessor(const DicomMap& values,
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50 const void* pixelData,
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51 size_t size) :
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52 information_(values),
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53 pixelData_(pixelData),
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54 size_(size)
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55 {
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56 frame_ = 0;
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57 frameOffset_ = (information_.GetHeight() * information_.GetWidth() *
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58 information_.GetBytesPerValue() * information_.GetChannelCount());
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59
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60 if (information_.GetNumberOfFrames() * frameOffset_ > size)
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61 {
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62 throw OrthancException(ErrorCode_BadFileFormat);
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63 }
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64
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65 if (information_.IsSigned())
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66 {
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67 // Pixels are signed
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68 mask_ = (1 << (information_.GetBitsStored() - 1)) - 1;
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69 signMask_ = (1 << (information_.GetBitsStored() - 1));
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70 }
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71 else
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72 {
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73 // Pixels are unsigned
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74 mask_ = (1 << information_.GetBitsStored()) - 1;
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75 signMask_ = 0;
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76 }
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78 if (information_.IsPlanar())
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79 {
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80 /**
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81 * Each color plane shall be sent contiguously. For RGB images,
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82 * this means the order of the pixel values sent is R1, R2, R3,
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83 * ..., G1, G2, G3, ..., B1, B2, B3, etc.
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84 **/
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85 rowOffset_ = information_.GetWidth() * information_.GetBytesPerValue();
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86 }
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87 else
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88 {
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89 /**
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90 * The sample values for the first pixel are followed by the
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91 * sample values for the second pixel, etc. For RGB images, this
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92 * means the order of the pixel values sent shall be R1, G1, B1,
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93 * R2, G2, B2, ..., etc.
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94 **/
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95 rowOffset_ = information_.GetWidth() * information_.GetBytesPerValue() * information_.GetChannelCount();
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96 }
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97 }
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100 void DicomIntegerPixelAccessor::GetExtremeValues(int32_t& min,
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101 int32_t& max) const
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102 {
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103 if (information_.GetHeight() == 0 || information_.GetWidth() == 0)
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104 {
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105 min = max = 0;
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106 return;
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107 }
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108
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109 min = std::numeric_limits<int32_t>::max();
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110 max = std::numeric_limits<int32_t>::min();
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111
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112 for (unsigned int y = 0; y < information_.GetHeight(); y++)
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113 {
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114 for (unsigned int x = 0; x < information_.GetWidth(); x++)
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115 {
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116 for (unsigned int c = 0; c < information_.GetChannelCount(); c++)
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117 {
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118 int32_t v = GetValue(x, y);
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119 if (v < min)
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120 min = v;
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121 if (v > max)
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122 max = v;
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123 }
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124 }
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125 }
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126 }
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128
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129 int32_t DicomIntegerPixelAccessor::GetValue(unsigned int x,
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130 unsigned int y,
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131 unsigned int channel) const
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132 {
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133 assert(x < information_.GetWidth() &&
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134 y < information_.GetHeight() &&
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135 channel < information_.GetChannelCount());
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136
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137 const uint8_t* pixel = reinterpret_cast<const uint8_t*>(pixelData_) +
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138 y * rowOffset_ + frame_ * frameOffset_;
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139
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140 // https://www.dabsoft.ch/dicom/3/C.7.6.3.1.3/
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141 if (information_.IsPlanar())
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142 {
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143 /**
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144 * Each color plane shall be sent contiguously. For RGB images,
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145 * this means the order of the pixel values sent is R1, R2, R3,
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146 * ..., G1, G2, G3, ..., B1, B2, B3, etc.
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147 **/
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148 assert(frameOffset_ % information_.GetChannelCount() == 0);
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149 pixel += channel * frameOffset_ / information_.GetChannelCount() + x * information_.GetBytesPerValue();
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150 }
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151 else
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152 {
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153 /**
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154 * The sample values for the first pixel are followed by the
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155 * sample values for the second pixel, etc. For RGB images, this
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156 * means the order of the pixel values sent shall be R1, G1, B1,
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157 * R2, G2, B2, ..., etc.
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158 **/
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159 pixel += channel * information_.GetBytesPerValue() + x * information_.GetChannelCount() * information_.GetBytesPerValue();
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160 }
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161
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162 uint32_t v;
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163 v = pixel[0];
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164 if (information_.GetBytesPerValue() >= 2)
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165 v = v + (static_cast<uint32_t>(pixel[1]) << 8);
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166 if (information_.GetBytesPerValue() >= 3)
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167 v = v + (static_cast<uint32_t>(pixel[2]) << 16);
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168 if (information_.GetBytesPerValue() >= 4)
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169 v = v + (static_cast<uint32_t>(pixel[3]) << 24);
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170
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171 v = v >> information_.GetShift();
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172
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173 if (v & signMask_)
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174 {
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175 // Signed value
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176 // http://en.wikipedia.org/wiki/Two%27s_complement#Subtraction_from_2N
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177 return -static_cast<int32_t>(mask_) + static_cast<int32_t>(v & mask_) - 1;
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178 }
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179 else
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180 {
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181 // Unsigned value
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182 return static_cast<int32_t>(v & mask_);
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183 }
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184 }
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185
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186
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187 void DicomIntegerPixelAccessor::SetCurrentFrame(unsigned int frame)
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188 {
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189 if (frame >= information_.GetNumberOfFrames())
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190 {
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191 throw OrthancException(ErrorCode_ParameterOutOfRange);
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192 }
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193
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194 frame_ = frame;
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195 }
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196
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197 }