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1 /**
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2 * Palantir - A Lightweight, RESTful DICOM Store
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3 * Copyright (C) 2012 Medical Physics Department, CHU of Liege,
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4 * 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 * This program is distributed in the hope that it will be useful, but
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12 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 **/
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19
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20
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21 #include "DicomIntegerPixelAccessor.h"
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22
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23 #include "../Core/PalantirException.h"
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24 #include "FromDcmtkBridge.h"
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25 #include <boost/lexical_cast.hpp>
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26
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27 namespace Palantir
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28 {
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29 DicomIntegerPixelAccessor::DicomIntegerPixelAccessor(const DicomMap& values,
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30 const void* pixelData,
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31 size_t size) :
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32 pixelData_(pixelData),
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33 size_(size)
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34 {
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35 unsigned int bitsAllocated;
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36 unsigned int bitsStored;
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37 unsigned int highBit;
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38 unsigned int pixelRepresentation;
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39
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40 try
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41 {
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42 width_ = boost::lexical_cast<unsigned int>(FromDcmtkBridge::GetValue(values, "Columns").AsString());
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43 height_ = boost::lexical_cast<unsigned int>(FromDcmtkBridge::GetValue(values, "Rows").AsString());
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44 samplesPerPixel_ = boost::lexical_cast<unsigned int>(FromDcmtkBridge::GetValue(values, "SamplesPerPixel").AsString());
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45 bitsAllocated = boost::lexical_cast<unsigned int>(FromDcmtkBridge::GetValue(values, "BitsAllocated").AsString());
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46 bitsStored = boost::lexical_cast<unsigned int>(FromDcmtkBridge::GetValue(values, "BitsStored").AsString());
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47 highBit = boost::lexical_cast<unsigned int>(FromDcmtkBridge::GetValue(values, "HighBit").AsString());
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48 pixelRepresentation = boost::lexical_cast<unsigned int>(FromDcmtkBridge::GetValue(values, "PixelRepresentation").AsString());
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49 }
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50 catch (boost::bad_lexical_cast)
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51 {
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52 throw PalantirException(ErrorCode_NotImplemented);
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53 }
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54
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55 if (bitsAllocated != 8 && bitsAllocated != 16 &&
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56 bitsAllocated != 24 && bitsAllocated != 32)
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57 {
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58 throw PalantirException(ErrorCode_NotImplemented);
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59 }
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60
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61 if (bitsAllocated > 32 ||
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62 bitsStored >= 32)
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63 {
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64 // Not available, as the accessor internally uses int32_t values
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65 throw PalantirException(ErrorCode_NotImplemented);
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66 }
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67
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68 if (samplesPerPixel_ != 1)
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69 {
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70 throw PalantirException(ErrorCode_NotImplemented);
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71 }
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72
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73 if (width_ * height_ * bitsAllocated / 8 != size)
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74 {
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75 throw PalantirException(ErrorCode_NotImplemented);
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76 }
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77
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78 printf("%d %d %d %d %d %d %d\n", width_, height_, samplesPerPixel_, bitsAllocated,
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79 bitsStored, highBit, pixelRepresentation);
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80
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81 bytesPerPixel_ = bitsAllocated / 8;
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82 shift_ = highBit + 1 - bitsStored;
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83
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84 if (pixelRepresentation)
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85 {
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86 mask_ = (1 << (bitsStored - 1)) - 1;
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87 signMask_ = (1 << (bitsStored - 1));
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88 }
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89 else
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90 {
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91 mask_ = (1 << bitsStored) - 1;
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92 signMask_ = 0;
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93 }
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94 }
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95
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96
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97 void DicomIntegerPixelAccessor::GetExtremeValues(int32_t& min,
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98 int32_t& max) const
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99 {
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100 if (height_ == 0 || width_ == 0)
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101 {
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102 min = max = 0;
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103 return;
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104 }
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105
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106 min = std::numeric_limits<int32_t>::max();
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107 max = std::numeric_limits<int32_t>::min();
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108
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109 for (unsigned int y = 0; y < height_; y++)
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110 {
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111 for (unsigned int x = 0; x < width_; x++)
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112 {
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113 int32_t v = GetValue(x, y);
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114 if (v < min)
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115 min = v;
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116 if (v > max)
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117 max = v;
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118 }
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119 }
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120 }
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121
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122
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123 int32_t DicomIntegerPixelAccessor::GetValue(unsigned int x, unsigned int y) const
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124 {
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125 assert(x < width_ && y < height_);
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126
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127 const uint8_t* pixel = reinterpret_cast<const uint8_t*>(pixelData_) + (y * width_ + x) * bytesPerPixel_;
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128
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129 int32_t v;
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130 v = pixel[0];
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131 if (bytesPerPixel_ >= 2)
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132 v = v + (static_cast<int32_t>(pixel[1]) << 8);
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133 if (bytesPerPixel_ >= 3)
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134 v = v + (static_cast<int32_t>(pixel[2]) << 16);
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135 if (bytesPerPixel_ >= 4)
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136 v = v + (static_cast<int32_t>(pixel[3]) << 24);
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137
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138 v = (v >> shift_) & mask_;
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139
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140 if (v & signMask_)
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141 {
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142 // Signed value: Not implemented yet
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143 //throw PalantirException(ErrorCode_NotImplemented);
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144 v = 0;
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145 }
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146
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147 return v;
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148 }
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149 }
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