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annotate Applications/Platforms/WebAssembly/WebAssemblyViewport.h @ 1870:3889ae96d2e9

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added copyright UCLouvain
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:04:09 +0100
parents 9ac2a65d4172
children 7053b8a0aaec
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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) 2017-2021 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2021 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 Affero 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 * Affero 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 Affero General Public License
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19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 **/
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21
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22
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23 #pragma once
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24
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25 #include "../../../OrthancStone/Sources/OrthancStone.h"
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26
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27 #if !defined(ORTHANC_ENABLE_WASM)
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28 # error Macro ORTHANC_ENABLE_WASM must be defined
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29 #endif
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30
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31 #if ORTHANC_ENABLE_WASM != 1
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32 # error This file can only be used if targeting WebAssembly
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33 #endif
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34
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35 #include "../../../OrthancStone/Sources/Viewport/IViewport.h"
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36 #include "../../../OrthancStone/Sources/Viewport/IViewportInteractor.h"
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37
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38 #include <Compatibility.h>
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39
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40 #include <emscripten.h>
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41 #include <emscripten/html5.h>
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42
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43 #include <memory>
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44 #include <string>
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45 #include <vector>
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46 #include <boost/enable_shared_from_this.hpp>
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47
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48 namespace OrthancStone
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49 {
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50 class WebAssemblyViewport : public IViewport,
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51 public boost::enable_shared_from_this<WebAssemblyViewport>
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52
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53 {
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54 private:
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55 class WasmLock;
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56
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57 std::string canvasId_;
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58 std::string canvasCssSelector_;
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59 std::unique_ptr<ICompositor> compositor_;
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60 std::unique_ptr<ViewportController> controller_;
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61 std::unique_ptr<IViewportInteractor> interactor_;
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62 bool enableEmscriptenMouseEvents_;
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63 unsigned int canvasWidth_;
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64 unsigned int canvasHeight_;
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65
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66 static EM_BOOL OnRequestAnimationFrame(double time, void *userData);
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67
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68 static EM_BOOL OnResize(int eventType, const EmscriptenUiEvent *uiEvent, void *userData);
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69
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70 static EM_BOOL OnMouseDown(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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71
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72 static EM_BOOL OnMouseMove(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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73
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74 static EM_BOOL OnMouseUp(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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75
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76 protected:
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77 void Invalidate();
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78
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79 void ClearCompositor()
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80 {
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81 compositor_.reset();
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82 }
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83
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84 bool HasCompositor() const
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85 {
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86 return compositor_.get() != NULL;
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87 }
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88
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89 void AcquireCompositor(ICompositor* compositor /* takes ownership */);
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90
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91 virtual void Paint(ICompositor& compositor,
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92 ViewportController& controller) = 0;
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93
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94 /**
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95 The second argument is temporary and should be deleted once the migration
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96 to interactors is finished. It should be set to "true" for new applications.
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97 */
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98 WebAssemblyViewport(const std::string& canvasId,
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99 bool enableEmscriptenMouseEvents);
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100
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101 void PostConstructor();
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102
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103
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104 /**
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105 * This method can be called to retrieve a cookie that can be passed to
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106 * C-style callbacks that expect the object to be passed as a void*
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107 *
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108 * This cookie is a resource and must be freed when it is guaranteed
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109 * not to be used anymore, with ReleaseObjectCookie
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110 */
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111 void* CreateObjectCookie();
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112
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113 /**
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114 * This static method can be used to dereference a cookie (i.e. retrieve
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115 * a pointer to the underlying object) that has been created with
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116 * WebAssemblyViewport::CreateObjectCookie()
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117 *
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118 * If this method returns NULL, it basically means that the
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119 * WebAssemblyViewport has already been deleted and that you should NOT
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120 * attempt to use it!
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121 *
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122 * This method never releases the cookie (for other in-flight callbacks
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123 * could possibly require to cookie to be valid)
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124 *
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125 * If this method is called AFTER ReleaseObjectCookie has been called on
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126 * the same cookie, the behavior is undefined and things will CERTAINLY
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127 * go wrong.
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128 *
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129 * NEVER call this method on a void* that has not been generated by the
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130 * CreateObjectCookie method of this class
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131 */
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132 static WebAssemblyViewport* DereferenceObjectCookie(void* cookie);
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133
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134 /**
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135 * This method must be used when the object cookie will not be used anymore.
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136 *
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137 * You must call it when you are certain that no entity will attempt to
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138 * dereference the cookie.
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139 */
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140 static void ReleaseObjectCookie(void* cookie);
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141
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142 void RefreshCanvasSize();
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143
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144 unsigned int GetCanvasWidth() const
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145 {
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146 return canvasWidth_;
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147 }
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148
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149 unsigned int GetCanvasHeight()
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150 {
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151 return canvasHeight_;
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152 }
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153
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154 public:
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155 virtual ILock* Lock() ORTHANC_OVERRIDE;
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156
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157 ~WebAssemblyViewport();
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158
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159 /**
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160 This method takes ownership
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161 */
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162 void AcquireInteractor(IViewportInteractor* interactor);
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163
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164 const std::string& GetCanvasId() const
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165 {
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166 return canvasId_;
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167 }
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168
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169 /**
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170 emscripten functions requires the css selector for the canvas. This is
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171 different from the canvas id (the syntax is '#mycanvasid')
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172 */
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173 const std::string& GetCanvasCssSelector() const
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174 {
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175 return canvasCssSelector_;
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176 }
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177
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178 void FitForPrint();
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179 };
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180 }