Mercurial > hg > orthanc-stone

annotate Framework/Scene2D/Internals/OpenGLLookupTableTextureRenderer.cpp @ 1048:f6be9412e42a

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cleaning up IObservable.h
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 10 Oct 2019 14:11:52 +0200
parents 1091b2adeb5a
children 177e7d431cd1 2d8ab34c8c91
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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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21
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22 #include "OpenGLLookupTableTextureRenderer.h"
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23
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24 #include <Core/OrthancException.h>
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25
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26 namespace OrthancStone
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27 {
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28 namespace Internals
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29 {
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30 void OpenGLLookupTableTextureRenderer::LoadTexture(
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31 const LookupTableTextureSceneLayer& layer)
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32 {
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33 if (!context_.IsContextLost())
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34 {
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35 const Orthanc::ImageAccessor& source = layer.GetTexture();
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36 const unsigned int width = source.GetWidth();
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37 const unsigned int height = source.GetHeight();
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39 if ((texture_.get() == NULL) ||
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40 (texture_->GetWidth() != width) ||
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41 (texture_->GetHeight() != height))
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42 {
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43
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44 texture_.reset(new Orthanc::Image(
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45 Orthanc::PixelFormat_RGBA32,
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46 width,
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47 height,
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48 false));
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49 }
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50
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51 {
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52
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53 const float a = layer.GetMinValue();
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54 float slope = 0;
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55
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56 if (layer.GetMinValue() >= layer.GetMaxValue())
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57 {
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58 slope = 0;
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59 }
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60 else
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61 {
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62 slope = 256.0f / (layer.GetMaxValue() - layer.GetMinValue());
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63 }
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64
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65 Orthanc::ImageAccessor target;
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66 texture_->GetWriteableAccessor(target);
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67
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68 const std::vector<uint8_t>& lut = layer.GetLookupTable();
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69 if (lut.size() != 4 * 256)
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70 {
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71 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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72 }
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74 assert(source.GetFormat() == Orthanc::PixelFormat_Float32 &&
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75 target.GetFormat() == Orthanc::PixelFormat_RGBA32 &&
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76 sizeof(float) == 4);
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77
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78 for (unsigned int y = 0; y < height; y++)
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79 {
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80 const float* p = reinterpret_cast<const float*>(source.GetConstRow(y));
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81 uint8_t* q = reinterpret_cast<uint8_t*>(target.GetRow(y));
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82
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83 for (unsigned int x = 0; x < width; x++)
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84 {
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85 float v = (*p - a) * slope;
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86 if (v <= 0)
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87 {
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88 v = 0;
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89 }
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90 else if (v >= 255)
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91 {
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92 v = 255;
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93 }
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94
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95 uint8_t vv = static_cast<uint8_t>(v);
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96
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97 q[0] = lut[4 * vv + 0]; // R
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98 q[1] = lut[4 * vv + 1]; // G
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99 q[2] = lut[4 * vv + 2]; // B
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100 q[3] = lut[4 * vv + 3]; // A
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101
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102 p++;
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103 q += 4;
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104 }
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105 }
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106 }
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107
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108 context_.MakeCurrent();
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109 glTexture_.reset(new OpenGL::OpenGLTexture(context_));
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110 glTexture_->Load(*texture_, layer.IsLinearInterpolation());
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111 layerTransform_ = layer.GetTransform();
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112 }
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113 }
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114
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115 OpenGLLookupTableTextureRenderer::OpenGLLookupTableTextureRenderer(
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116 OpenGL::IOpenGLContext& context,
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117 OpenGLColorTextureProgram& program,
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118 const LookupTableTextureSceneLayer& layer)
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119 : context_(context)
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120 , program_(program)
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121 {
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122 LoadTexture(layer);
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123 }
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124
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125
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126 void OpenGLLookupTableTextureRenderer::Render(const AffineTransform2D& transform,
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127 unsigned int canvasWidth,
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128 unsigned int canvasHeight)
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129 {
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130 if (!context_.IsContextLost() && glTexture_.get() != NULL)
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131 {
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132 program_.Apply(
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133 *glTexture_,
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134 AffineTransform2D::Combine(transform, layerTransform_),
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135 true);
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136 }
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137 }
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138
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139
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140 void OpenGLLookupTableTextureRenderer::Update(const ISceneLayer& layer)
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141 {
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142 // Should never happen (no revisions in color textures)
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143 LoadTexture(dynamic_cast<const LookupTableTextureSceneLayer&>(layer));
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144 }
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145 }
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146 }