Mercurial > hg > orthanc-stone

annotate Framework/Scene2D/Internals/CompositorHelper.cpp @ 1326:55166e57a77c broker

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doc
author Benjamin Golinvaux <bgo@osimis.io>
date Tue, 24 Mar 2020 21:32:35 +0100
parents 257f2c9a02ac
children 30deba7bc8e2
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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) 2017-2020 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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20
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21
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22 #include "CompositorHelper.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 class CompositorHelper::Item : public boost::noncopyable
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31 {
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32 private:
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33 std::unique_ptr<ILayerRenderer> renderer_;
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34 const ISceneLayer& layer_;
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35 uint64_t layerIdentifier_;
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36 uint64_t lastRevision_;
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37
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38 public:
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39 Item(ILayerRenderer* renderer, // Takes ownership
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40 const ISceneLayer& layer,
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41 uint64_t layerIdentifier) :
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42 renderer_(renderer),
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43 layer_(layer),
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44 layerIdentifier_(layerIdentifier),
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45 lastRevision_(layer.GetRevision())
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46 {
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47 if (renderer == NULL)
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48 {
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49 throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
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50 }
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51 }
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52
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53 ILayerRenderer& GetRenderer() const
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54 {
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55 assert(renderer_.get() != NULL);
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56 return *renderer_;
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57 }
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58
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59 const ISceneLayer& GetLayer() const
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60 {
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61 return layer_;
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62 }
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63
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64 uint64_t GetLayerIdentifier() const
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65 {
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66 return layerIdentifier_;
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67 }
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68
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69 uint64_t GetLastRevision() const
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70 {
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71 return lastRevision_;
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72 }
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73
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74 void UpdateRenderer()
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75 {
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76 assert(renderer_.get() != NULL);
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77 renderer_->Update(layer_);
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78 lastRevision_ = layer_.GetRevision();
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79 }
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80 };
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81
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82
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83 void CompositorHelper::Visit(const Scene2D& scene,
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84 const ISceneLayer& layer,
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85 uint64_t layerIdentifier,
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86 int depth)
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87 {
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88 // "Visit()" is only applied to layers existing in the scene
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89 assert(scene.HasLayer(depth));
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90
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91 Content::iterator found = content_.find(depth);
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92
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93 assert(found == content_.end() ||
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94 found->second != NULL);
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95
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96 if (found == content_.end() ||
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97 found->second->GetLayerIdentifier() != layerIdentifier)
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98 {
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99 // This is the first time this layer is rendered, or the layer
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100 // is not the same as before
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101 if (found != content_.end())
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102 {
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103 delete found->second;
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104 content_.erase(found);
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105 }
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106
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107 // the returned renderer can be NULL in case of an unknown layer
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108 // or a NullLayer
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109 std::unique_ptr<ILayerRenderer> renderer(factory_.Create(layer));
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110
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111 if (renderer.get() != NULL)
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112 {
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113 renderer->Render(sceneTransform_, canvasWidth_, canvasHeight_);
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114 content_[depth] = new Item(renderer.release(), layer, layerIdentifier);
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115 }
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116 }
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117 else
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118 {
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119 // This layer has already been rendered
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120 assert(found->second->GetLastRevision() <= layer.GetRevision());
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121
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122 if (found->second->GetLastRevision() < layer.GetRevision())
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123 {
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124 found->second->UpdateRenderer();
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125 }
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126
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127 found->second->GetRenderer().Render(sceneTransform_, canvasWidth_, canvasHeight_);
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128 }
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129
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130 // Check invariants
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131 assert(content_.find(depth) == content_.end() ||
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132 (content_[depth]->GetLayerIdentifier() == layerIdentifier &&
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133 content_[depth]->GetLastRevision() == layer.GetRevision()));
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134 }
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135
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136
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137 CompositorHelper::~CompositorHelper()
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138 {
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139 for (Content::iterator it = content_.begin(); it != content_.end(); ++it)
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140 {
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141 assert(it->second != NULL);
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142 delete it->second;
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143 }
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144 }
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145
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146
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147 void CompositorHelper::Refresh(const Scene2D& scene,
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148 unsigned int canvasWidth,
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149 unsigned int canvasHeight)
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150 {
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151 /**
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152 * Safeguard mechanism to enforce the fact that the same scene
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153 * is always used with the compositor. Note that the safeguard
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154 * is not 100% bullet-proof, as a new scene might reuse the same
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155 * address as a previous scene.
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156 **/
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157 if (lastScene_ != NULL &&
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158 lastScene_ != &scene)
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159 {
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160 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls,
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161 "ICompositor::ResetScene() should have been called");
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162 }
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163
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164 lastScene_ = &scene;
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165
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166 // Bring coordinate (0,0) to the center of the canvas
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167 AffineTransform2D offset = AffineTransform2D::CreateOffset(
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168 static_cast<double>(canvasWidth) / 2.0,
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169 static_cast<double>(canvasHeight) / 2.0);
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170
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171 sceneTransform_ = AffineTransform2D::Combine(offset, scene.GetSceneToCanvasTransform());
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172 canvasWidth_ = canvasWidth;
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173 canvasHeight_ = canvasHeight;
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174 scene.Apply(*this);
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175 }
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176 }
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177 }