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annotate Framework/Viewport/WebAssemblyViewport.cpp @ 910:a6c12fe88bcb

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wip: WebAssemblyCairoViewport: still need to implement blit to canvas
author Alain Mazy <alain@mazy.be>
date Thu, 18 Jul 2019 10:39:00 +0200
parents 722ee73e6ba2
children 685c9a2d115f
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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) 2017-2019 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 "WebAssemblyViewport.h"
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23 #include <emscripten/html5.h>
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24
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25 namespace OrthancStone
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26 {
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27 WebAssemblyOpenGLViewport::WebAssemblyOpenGLViewport(const std::string& canvas) :
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28 WebAssemblyViewport(canvas),
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29 context_(canvas),
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30 compositor_(context_, GetScene())
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31 {
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32 }
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33
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34
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35 WebAssemblyOpenGLViewport::WebAssemblyOpenGLViewport(const std::string& canvas,
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36 boost::shared_ptr<Scene2D>& scene) :
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37 WebAssemblyViewport(canvas, scene),
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38 context_(canvas),
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39 compositor_(context_, GetScene())
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40 {
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41 }
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42
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43
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44 void WebAssemblyOpenGLViewport::UpdateSize()
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45 {
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46 context_.UpdateSize(); // First read the size of the canvas
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47 compositor_.Refresh(); // Then refresh the content of the canvas
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48 }
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50
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51 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas) :
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52 WebAssemblyViewport(canvas),
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53 canvas_(canvas),
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54 compositor_(GetScene(), 1024, 768)
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55 {
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56 }
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57
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58
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59 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvas,
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60 boost::shared_ptr<Scene2D>& scene) :
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61 WebAssemblyViewport(canvas, scene),
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62 canvas_(canvas),
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63 compositor_(GetScene(), 1024, 768)
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64 {
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65 }
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66
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67
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68 void WebAssemblyCairoViewport::UpdateSize()
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69 {
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70 LOG(INFO) << "updating cairo viewport size";
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71 double w, h;
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72 emscripten_get_element_css_size(canvas_.c_str(), &w, &h);
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73
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74 /**
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75 * Emscripten has the function emscripten_get_element_css_size()
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76 * to query the width and height of a named HTML element. I'm
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77 * calling this first to get the initial size of the canvas DOM
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78 * element, and then call emscripten_set_canvas_size() to
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79 * initialize the framebuffer size of the canvas to the same
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80 * size as its DOM element.
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81 * https://floooh.github.io/2017/02/22/emsc-html.html
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82 **/
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83 unsigned int canvasWidth = 0;
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84 unsigned int canvasHeight = 0;
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85
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86 if (w > 0 ||
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87 h > 0)
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88 {
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89 canvasWidth = static_cast<unsigned int>(boost::math::iround(w));
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90 canvasHeight = static_cast<unsigned int>(boost::math::iround(h));
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91 }
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92
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93 emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth, canvasHeight);
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94 compositor_.UpdateSize(canvasWidth, canvasHeight);
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95 }
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96
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97 void WebAssemblyCairoViewport::Refresh()
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98 {
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99 LOG(INFO) << "refreshing cairo viewport, TODO: blit to the canvans.getContext('2d')";
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100 GetCompositor().Refresh();
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101 }
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102
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103 }