Mercurial > hg > orthanc-stone
annotate Framework/Viewport/WebAssemblyCairoViewport.cpp @ 1455:30deba7bc8e2
simplifying include_directories
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Thu, 11 Jun 2020 20:54:01 +0200 |
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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 "WebAssemblyCairoViewport.h" |
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23 |
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24 #include "../Scene2D/CairoCompositor.h" |
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25 |
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26 #include <Images/Image.h> |
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27 |
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28 namespace OrthancStone |
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29 { |
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30 void WebAssemblyCairoViewport::GetCanvasSize(unsigned int& width, |
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31 unsigned int& height) |
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32 { |
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33 double w, h; |
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34 emscripten_get_element_css_size(GetCanvasCssSelector().c_str(), &w, &h); |
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35 |
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36 /** |
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37 * Emscripten has the function emscripten_get_element_css_size() |
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38 * to query the width and height of a named HTML element. I'm |
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39 * calling this first to get the initial size of the canvas DOM |
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40 * element, and then call emscripten_set_canvas_size() to |
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41 * initialize the framebuffer size of the canvas to the same |
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42 * size as its DOM element. |
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43 * https://floooh.github.io/2017/02/22/emsc-html.html |
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44 **/ |
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45 if (w > 0 && |
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46 h > 0) |
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47 { |
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48 width = static_cast<unsigned int>(boost::math::iround(w)); |
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49 height = static_cast<unsigned int>(boost::math::iround(h)); |
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50 } |
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51 else |
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52 { |
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53 width = 0; |
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54 height = 0; |
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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 void WebAssemblyCairoViewport::Paint(ICompositor& compositor, |
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60 ViewportController& controller) |
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61 { |
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62 compositor.Refresh(controller.GetScene()); |
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63 |
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64 // Create a temporary memory buffer for the canvas in JavaScript |
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65 Orthanc::ImageAccessor cairo; |
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66 dynamic_cast<CairoCompositor&>(compositor).GetCanvas().GetReadOnlyAccessor(cairo); |
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67 |
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68 const unsigned int width = cairo.GetWidth(); |
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69 const unsigned int height = cairo.GetHeight(); |
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70 |
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71 if (javascript_.get() == NULL || |
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72 javascript_->GetWidth() != width || |
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73 javascript_->GetHeight() != height) |
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74 { |
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75 javascript_.reset(new Orthanc::Image(Orthanc::PixelFormat_RGBA32, width, height, |
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76 true /* force minimal pitch */)); |
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77 } |
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78 |
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79 // Convert from BGRA32 memory layout (only color mode supported |
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80 // by Cairo, which corresponds to CAIRO_FORMAT_ARGB32) to RGBA32 |
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81 // (as expected by HTML5 canvas). This simply amounts to |
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82 // swapping the B and R channels. Alpha channel is also set to |
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83 // full opacity (255). |
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84 uint8_t* q = reinterpret_cast<uint8_t*>(javascript_->GetBuffer()); |
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85 for (unsigned int y = 0; y < height; y++) |
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86 { |
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87 const uint8_t* p = reinterpret_cast<const uint8_t*>(cairo.GetConstRow(y)); |
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88 for (unsigned int x = 0; x < width; x++) |
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89 { |
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90 q[0] = p[2]; // R |
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91 q[1] = p[1]; // G |
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92 q[2] = p[0]; // B |
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93 q[3] = 255; // A |
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94 |
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95 p += 4; |
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96 q += 4; |
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97 } |
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98 } |
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99 |
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100 // Execute JavaScript commands to blit the image buffer onto the |
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101 // 2D drawing context of the HTML5 canvas |
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102 EM_ASM({ |
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103 const data = new Uint8ClampedArray(Module.HEAP8.buffer, $1, 4 * $2 * $3); |
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104 const img = new ImageData(data, $2, $3); |
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105 const ctx = document.getElementById(UTF8ToString($0)).getContext('2d'); |
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106 ctx.putImageData(img, 0, 0); |
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107 }, |
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108 GetCanvasId().c_str(), // $0 |
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109 javascript_->GetBuffer(), // $1 |
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110 javascript_->GetWidth(), // $2 |
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111 javascript_->GetHeight()); // $3 |
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112 } |
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113 |
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114 |
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115 void WebAssemblyCairoViewport::UpdateSize(ICompositor& compositor) |
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116 { |
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117 unsigned int width, height; |
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118 GetCanvasSize(width, height); |
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119 emscripten_set_canvas_element_size(GetCanvasCssSelector().c_str(), width, height); |
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120 |
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121 dynamic_cast<CairoCompositor&>(compositor).UpdateSize(width, height); |
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122 } |
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123 |
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124 |
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125 WebAssemblyCairoViewport::WebAssemblyCairoViewport( |
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126 const std::string& canvasId) : |
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127 WebAssemblyViewport(canvasId) |
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128 { |
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129 unsigned int width, height; |
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130 GetCanvasSize(width, height); |
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131 emscripten_set_canvas_element_size(GetCanvasCssSelector().c_str(), |
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132 width, |
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133 height); |
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134 |
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135 AcquireCompositor(new CairoCompositor(width, height)); |
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136 } |
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137 } |