Mercurial > hg > orthanc-stone

annotate OrthancStone/Sources/Platforms/WebAssembly/WebAssemblyViewport.h @ 1901:184b0aeae1af

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fix build of sdl
author Sebastien Jodogne <s.jodogne@gmail.com>
date Sat, 29 Jan 2022 16:55:14 +0100
parents 917500c46fe0
children 07964689cb0b
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1899
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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) 2017-2022 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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22
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23
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24 #pragma once
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25
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26 #include "../../OrthancStone.h"
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27
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28 #if !defined(ORTHANC_ENABLE_WASM)
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29 # error Macro ORTHANC_ENABLE_WASM must be defined
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30 #endif
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31
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32 #if ORTHANC_ENABLE_WASM != 1
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33 # error This file can only be used if targeting WebAssembly
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34 #endif
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35
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36 #include "../../Viewport/IViewport.h"
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37 #include "../../Viewport/IViewportInteractor.h"
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38
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39 #include <Compatibility.h>
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40
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41 #include <emscripten.h>
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42 #include <emscripten/html5.h>
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43
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44 #include <memory>
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45 #include <string>
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46 #include <vector>
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47 #include <boost/enable_shared_from_this.hpp>
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48
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49 namespace OrthancStone
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50 {
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51 class WebAssemblyViewport : public IViewport,
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52 public boost::enable_shared_from_this<WebAssemblyViewport>
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53
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54 {
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55 private:
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56 class WasmLock;
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57
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58 std::string canvasId_;
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59 std::string canvasCssSelector_;
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60 std::unique_ptr<ICompositor> compositor_;
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61 std::unique_ptr<ViewportController> controller_;
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62 std::unique_ptr<IViewportInteractor> interactor_;
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63 bool enableEmscriptenMouseEvents_;
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64 unsigned int canvasWidth_;
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65 unsigned int canvasHeight_;
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66
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67 static EM_BOOL OnRequestAnimationFrame(double time, void *userData);
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68
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69 static EM_BOOL OnResize(int eventType, const EmscriptenUiEvent *uiEvent, void *userData);
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70
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71 static EM_BOOL OnMouseDown(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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72
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73 static EM_BOOL OnMouseMove(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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74
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75 static EM_BOOL OnMouseUp(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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76
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77 protected:
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78 void Invalidate();
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79
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80 void ClearCompositor()
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81 {
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82 compositor_.reset();
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83 }
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84
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85 bool HasCompositor() const
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86 {
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87 return compositor_.get() != NULL;
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88 }
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89
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90 void AcquireCompositor(ICompositor* compositor /* takes ownership */);
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91
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92 virtual void Paint(ICompositor& compositor,
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93 ViewportController& controller) = 0;
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94
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95 /**
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96 The second argument is temporary and should be deleted once the migration
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97 to interactors is finished. It should be set to "true" for new applications.
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98 */
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99 WebAssemblyViewport(const std::string& canvasId,
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100 bool enableEmscriptenMouseEvents);
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101
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102 void PostConstructor();
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103
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104
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105 /**
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106 * This method can be called to retrieve a cookie that can be passed to
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107 * C-style callbacks that expect the object to be passed as a void*
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108 *
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109 * This cookie is a resource and must be freed when it is guaranteed
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110 * not to be used anymore, with ReleaseObjectCookie
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111 */
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112 void* CreateObjectCookie();
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113
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114 /**
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115 * This static method can be used to dereference a cookie (i.e. retrieve
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116 * a pointer to the underlying object) that has been created with
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117 * WebAssemblyViewport::CreateObjectCookie()
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118 *
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119 * If this method returns NULL, it basically means that the
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120 * WebAssemblyViewport has already been deleted and that you should NOT
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121 * attempt to use it!
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122 *
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123 * This method never releases the cookie (for other in-flight callbacks
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124 * could possibly require to cookie to be valid)
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125 *
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126 * If this method is called AFTER ReleaseObjectCookie has been called on
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127 * the same cookie, the behavior is undefined and things will CERTAINLY
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128 * go wrong.
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129 *
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130 * NEVER call this method on a void* that has not been generated by the
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131 * CreateObjectCookie method of this class
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132 */
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133 static WebAssemblyViewport* DereferenceObjectCookie(void* cookie);
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134
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135 /**
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136 * This method must be used when the object cookie will not be used anymore.
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137 *
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138 * You must call it when you are certain that no entity will attempt to
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139 * dereference the cookie.
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140 */
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141 static void ReleaseObjectCookie(void* cookie);
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142
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143 void RefreshCanvasSize();
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144
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145 unsigned int GetCanvasWidth() const
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146 {
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147 return canvasWidth_;
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148 }
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149
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150 unsigned int GetCanvasHeight()
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151 {
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152 return canvasHeight_;
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153 }
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154
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155 public:
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156 virtual ILock* Lock() ORTHANC_OVERRIDE;
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157
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158 ~WebAssemblyViewport();
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159
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160 /**
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161 This method takes ownership
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162 */
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163 void AcquireInteractor(IViewportInteractor* interactor);
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164
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165 const std::string& GetCanvasId() const
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166 {
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167 return canvasId_;
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168 }
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169
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170 /**
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171 emscripten functions requires the css selector for the canvas. This is
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172 different from the canvas id (the syntax is '#mycanvasid')
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173 */
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174 const std::string& GetCanvasCssSelector() const
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175 {
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176 return canvasCssSelector_;
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177 }
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178
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179 void FitForPrint();
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180 };
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181 }