Mercurial > hg > orthanc-stone

annotate OrthancStone/Sources/Scene2D/Internals/CompositorHelper.cpp @ 1871:7053b8a0aaec

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:18:48 +0100
parents 3889ae96d2e9
children 07964689cb0b
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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
1871
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5 * Copyright (C) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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23
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24 #include "CompositorHelper.h"
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25
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26 #include <OrthancException.h>
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27
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28 namespace OrthancStone
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29 {
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30 namespace Internals
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31 {
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32 class CompositorHelper::Item : public boost::noncopyable
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33 {
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34 private:
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35 std::unique_ptr<ILayerRenderer> renderer_;
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36 const ISceneLayer& layer_;
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37 uint64_t layerIdentifier_;
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38 uint64_t lastRevision_;
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39
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40 public:
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41 Item(ILayerRenderer* renderer, // Takes ownership
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42 const ISceneLayer& layer,
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43 uint64_t layerIdentifier) :
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44 renderer_(renderer),
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45 layer_(layer),
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46 layerIdentifier_(layerIdentifier),
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47 lastRevision_(layer.GetRevision())
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48 {
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49 if (renderer == NULL)
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50 {
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51 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
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52 }
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53 }
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54
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55 ILayerRenderer& GetRenderer() const
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56 {
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57 assert(renderer_.get() != NULL);
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58 return *renderer_;
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59 }
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60
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61 const ISceneLayer& GetLayer() const
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62 {
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63 return layer_;
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64 }
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65
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66 uint64_t GetLayerIdentifier() const
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67 {
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68 return layerIdentifier_;
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69 }
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70
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71 uint64_t GetLastRevision() const
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72 {
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73 return lastRevision_;
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74 }
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75
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76 void UpdateRenderer()
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77 {
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78 assert(renderer_.get() != NULL);
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79 renderer_->Update(layer_);
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80 lastRevision_ = layer_.GetRevision();
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81 }
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82 };
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83
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84
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85 void CompositorHelper::Visit(const Scene2D& scene,
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86 const ISceneLayer& layer,
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87 uint64_t layerIdentifier,
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88 int depth)
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89 {
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90 // "Visit()" is only applied to layers existing in the scene
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91 assert(scene.HasLayer(depth));
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92
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93 Content::iterator found = content_.find(depth);
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94
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95 assert(found == content_.end() ||
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96 found->second != NULL);
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97
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98 if (found == content_.end() ||
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99 found->second->GetLayerIdentifier() != layerIdentifier)
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100 {
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101 // This is the first time this layer is rendered, or the layer
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102 // is not the same as before
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103 if (found != content_.end())
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104 {
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105 delete found->second;
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106 content_.erase(found);
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107 }
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108
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109 // the returned renderer can be NULL in case of an unknown layer
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110 // or a NullLayer
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111 std::unique_ptr<ILayerRenderer> renderer(factory_.Create(layer));
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112
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113 if (renderer.get() != NULL)
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114 {
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115 renderer->Render(sceneTransform_, canvasWidth_, canvasHeight_);
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116 content_[depth] = new Item(renderer.release(), layer, layerIdentifier);
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117 }
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118 }
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119 else
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120 {
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121 // This layer has already been rendered
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122 assert(found->second->GetLastRevision() <= layer.GetRevision());
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123
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124 if (found->second->GetLastRevision() < layer.GetRevision())
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125 {
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126 found->second->UpdateRenderer();
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127 }
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128
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129 found->second->GetRenderer().Render(sceneTransform_, canvasWidth_, canvasHeight_);
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130 }
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131
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132 // Check invariants
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133 assert(content_.find(depth) == content_.end() ||
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134 (content_[depth]->GetLayerIdentifier() == layerIdentifier &&
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135 content_[depth]->GetLastRevision() == layer.GetRevision()));
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136 }
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137
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138
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139 CompositorHelper::~CompositorHelper()
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140 {
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141 for (Content::iterator it = content_.begin(); it != content_.end(); ++it)
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142 {
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143 assert(it->second != NULL);
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144 delete it->second;
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145 }
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146 }
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147
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148
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149 void CompositorHelper::Refresh(const Scene2D& scene,
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150 unsigned int canvasWidth,
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151 unsigned int canvasHeight)
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152 {
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153 /**
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154 * Safeguard mechanism to enforce the fact that the same scene
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155 * is always used with the compositor. Note that the safeguard
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156 * is not 100% bullet-proof, as a new scene might reuse the same
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157 * address as a previous scene.
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158 **/
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159 if (lastScene_ != NULL &&
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160 lastScene_ != &scene)
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161 {
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162 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls,
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163 "ICompositor::ResetScene() should have been called");
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164 }
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165
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166 lastScene_ = &scene;
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167
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168 // Bring coordinate (0,0) to the center of the canvas
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169 AffineTransform2D offset = AffineTransform2D::CreateOffset(
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170 static_cast<double>(canvasWidth) / 2.0,
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171 static_cast<double>(canvasHeight) / 2.0);
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172
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173 sceneTransform_ = AffineTransform2D::Combine(offset, scene.GetSceneToCanvasTransform());
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174 canvasWidth_ = canvasWidth;
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175 canvasHeight_ = canvasHeight;
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176 scene.Apply(*this);
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177 }
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178 }
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179 }