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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 *
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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 "GrayscaleFrameRenderer.h"
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34
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35 #include "../Orthanc/Core/OrthancException.h"
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36
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37 namespace OrthancStone
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38 {
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39 CairoSurface* GrayscaleFrameRenderer::GenerateDisplay(const RenderStyle& style)
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40 {
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41 std::auto_ptr<CairoSurface> result;
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42
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43 float windowCenter, windowWidth;
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44 style.ComputeWindowing(windowCenter, windowWidth,
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45 defaultWindowCenter_, defaultWindowWidth_);
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46
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47 float x0 = windowCenter - windowWidth / 2.0f;
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48 float x1 = windowCenter + windowWidth / 2.0f;
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49
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50 //LOG(INFO) << "Window: " << x0 << " => " << x1;
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51
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52 result.reset(new CairoSurface(frame_->GetWidth(), frame_->GetHeight()));
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53
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54 const uint8_t* lut = NULL;
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55 if (style.applyLut_)
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56 {
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57 if (Orthanc::EmbeddedResources::GetFileResourceSize(style.lut_) != 3 * 256)
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58 {
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59 // Invalid colormap
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60 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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61 }
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62
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63 lut = reinterpret_cast<const uint8_t*>(Orthanc::EmbeddedResources::GetFileResourceBuffer(style.lut_));
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64 }
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65
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66 Orthanc::ImageAccessor target = result->GetAccessor();
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67 for (unsigned int y = 0; y < target.GetHeight(); y++)
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68 {
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69 const float* p = reinterpret_cast<const float*>(frame_->GetConstRow(y));
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70 uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y));
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71
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72 for (unsigned int x = 0; x < target.GetWidth(); x++, p++, q += 4)
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73 {
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74 uint8_t v = 0;
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75 if (windowWidth >= 0.001f) // Avoid division by zero
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76 {
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77 if (*p >= x1)
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78 {
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79 v = 255;
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80 }
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81 else if (*p <= x0)
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82 {
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83 v = 0;
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84 }
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85 else
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86 {
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87 // https://en.wikipedia.org/wiki/Linear_interpolation
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88 v = static_cast<uint8_t>(255.0f * (*p - x0) / (x1 - x0));
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89 }
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90
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91 if (style.reverse_)
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92 {
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93 v = 255 - v;
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94 }
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95 }
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96
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97 if (style.applyLut_)
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98 {
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99 assert(lut != NULL);
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100 q[3] = 255;
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101 q[2] = lut[3 * v];
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102 q[1] = lut[3 * v + 1];
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103 q[0] = lut[3 * v + 2];
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104 }
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105 else
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106 {
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107 q[3] = 255;
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108 q[2] = v;
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109 q[1] = v;
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110 q[0] = v;
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111 }
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112 }
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113 }
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114
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115 return result.release();
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116 }
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117
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118
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119 GrayscaleFrameRenderer::GrayscaleFrameRenderer(Orthanc::ImageAccessor* frame,
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120 const DicomFrameConverter& converter,
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121 const SliceGeometry& viewportSlice,
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122 const SliceGeometry& frameSlice,
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123 double pixelSpacingX,
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124 double pixelSpacingY,
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125 bool isFullQuality) :
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126 FrameRenderer(viewportSlice, frameSlice, pixelSpacingX, pixelSpacingY, isFullQuality),
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127 frame_(frame),
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128 defaultWindowCenter_(converter.GetDefaultWindowCenter()),
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129 defaultWindowWidth_(converter.GetDefaultWindowWidth())
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130 {
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131 if (frame == NULL)
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132 {
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133 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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134 }
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135
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136 converter.ConvertFrame(frame_);
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137 assert(frame_.get() != NULL);
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138
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139 if (frame_->GetFormat() != Orthanc::PixelFormat_Float32)
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140 {
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141 throw Orthanc::OrthancException(Orthanc::ErrorCode_IncompatibleImageFormat);
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142 }
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143 }
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144 }
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