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annotate OrthancStone/Sources/Viewport/WebAssemblyViewport.h @ 1571:85e117739eca

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 21 Sep 2020 17:46:39 +0200
parents 314b6dc507d9
children e4a52cbbdd70
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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 #pragma once
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23
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24 #include "../OrthancStone.h"
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25
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26 #if !defined(ORTHANC_ENABLE_WASM)
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27 # error Macro ORTHANC_ENABLE_WASM must be defined
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28 #endif
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29
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30 #if ORTHANC_ENABLE_WASM != 1
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31 # error This file can only be used if targeting WebAssembly
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32 #endif
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33
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34 #include "IViewport.h"
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35 #include "IViewportInteractor.h"
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36
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37 #include <Compatibility.h>
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38
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39 #include <emscripten.h>
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40 #include <emscripten/html5.h>
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41
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42 #include <memory>
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43 #include <string>
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44 #include <boost/enable_shared_from_this.hpp>
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45
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46 namespace OrthancStone
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47 {
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48 class WebAssemblyViewport : public IViewport,
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49 public boost::enable_shared_from_this<WebAssemblyViewport>
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50
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51 {
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52 private:
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53 class WasmLock;
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54
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55 std::string canvasId_;
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56 std::string canvasCssSelector_;
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57 std::unique_ptr<ICompositor> compositor_;
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58 std::unique_ptr<ViewportController> controller_;
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59 std::unique_ptr<IViewportInteractor> interactor_;
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60 bool enableEmscriptenMouseEvents_;
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61
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62 static EM_BOOL OnRequestAnimationFrame(double time, void *userData);
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63
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64 static EM_BOOL OnResize(int eventType, const EmscriptenUiEvent *uiEvent, void *userData);
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65
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66 static EM_BOOL OnMouseDown(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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67
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68 static EM_BOOL OnMouseMove(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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69
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70 static EM_BOOL OnMouseUp(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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71
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72 protected:
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73 void Invalidate();
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74
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75 void ClearCompositor()
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76 {
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77 compositor_.reset();
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78 }
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79
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80 bool HasCompositor() const
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81 {
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82 return compositor_.get() != NULL;
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83 }
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84
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85 void AcquireCompositor(ICompositor* compositor /* takes ownership */);
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86
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87 virtual void Paint(ICompositor& compositor,
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88 ViewportController& controller) = 0;
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89
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90 virtual void UpdateSize(ICompositor& compositor) = 0;
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91
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92 /**
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93 The second argument is temporary and should be deleted once the migration
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94 to interactors is finished. It should be set to "true" for new applications.
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95 */
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96 WebAssemblyViewport(const std::string& canvasId,
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97 bool enableEmscriptenMouseEvents);
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98
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99 void PostConstructor();
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100
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101 public:
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102 virtual ILock* Lock() ORTHANC_OVERRIDE;
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103
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104 ~WebAssemblyViewport();
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105
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106 virtual void UpdateCanvasSize();
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107
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108 /**
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109 This method takes ownership
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110 */
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111 void AcquireInteractor(IViewportInteractor* interactor);
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112
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113 const std::string& GetCanvasId() const
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114 {
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115 return canvasId_;
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116 }
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117
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118 /**
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119 emscripten functions requires the css selector for the canvas. This is
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120 different from the canvas id (the syntax is '#mycanvasid')
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121 */
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122 const std::string& GetCanvasCssSelector() const
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123 {
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124 return canvasCssSelector_;
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125 }
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126 };
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127 }