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annotate Framework/Viewport/WebAssemblyCairoViewport.cpp @ 1510:1005c1cbe4dd

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 07 Jul 2020 09:45:27 +0200
parents 4de884c95cd8
children
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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 #include <boost/math/special_functions/round.hpp>
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29
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30 namespace OrthancStone
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31 {
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32 void WebAssemblyCairoViewport::GetCanvasSize(unsigned int& width,
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33 unsigned int& height)
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34 {
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35 double w, h;
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36 emscripten_get_element_css_size(GetCanvasCssSelector().c_str(), &w, &h);
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37
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38 /**
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39 * Emscripten has the function emscripten_get_element_css_size()
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40 * to query the width and height of a named HTML element. I'm
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41 * calling this first to get the initial size of the canvas DOM
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42 * element, and then call emscripten_set_canvas_size() to
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43 * initialize the framebuffer size of the canvas to the same
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44 * size as its DOM element.
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45 * https://floooh.github.io/2017/02/22/emsc-html.html
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46 **/
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47 if (w > 0 &&
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48 h > 0)
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49 {
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50 width = static_cast<unsigned int>(boost::math::iround(w));
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51 height = static_cast<unsigned int>(boost::math::iround(h));
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52 }
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53 else
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54 {
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55 width = 0;
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56 height = 0;
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57 }
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58 }
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59
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60
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61 void WebAssemblyCairoViewport::Paint(ICompositor& compositor,
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62 ViewportController& controller)
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63 {
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64 compositor.Refresh(controller.GetScene());
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65
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66 // Create a temporary memory buffer for the canvas in JavaScript
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67 Orthanc::ImageAccessor cairo;
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68 dynamic_cast<CairoCompositor&>(compositor).GetCanvas().GetReadOnlyAccessor(cairo);
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69
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70 const unsigned int width = cairo.GetWidth();
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71 const unsigned int height = cairo.GetHeight();
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72
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73 if (javascript_.get() == NULL ||
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74 javascript_->GetWidth() != width ||
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75 javascript_->GetHeight() != height)
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76 {
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77 javascript_.reset(new Orthanc::Image(Orthanc::PixelFormat_RGBA32, width, height,
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78 true /* force minimal pitch */));
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79 }
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80
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81 // Convert from BGRA32 memory layout (only color mode supported
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82 // by Cairo, which corresponds to CAIRO_FORMAT_ARGB32) to RGBA32
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83 // (as expected by HTML5 canvas). This simply amounts to
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84 // swapping the B and R channels. Alpha channel is also set to
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85 // full opacity (255).
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86 uint8_t* q = reinterpret_cast<uint8_t*>(javascript_->GetBuffer());
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87 for (unsigned int y = 0; y < height; y++)
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88 {
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89 const uint8_t* p = reinterpret_cast<const uint8_t*>(cairo.GetConstRow(y));
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90 for (unsigned int x = 0; x < width; x++)
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91 {
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92 q[0] = p[2]; // R
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93 q[1] = p[1]; // G
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94 q[2] = p[0]; // B
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95 q[3] = 255; // A
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96
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97 p += 4;
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98 q += 4;
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99 }
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100 }
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101
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102 // Execute JavaScript commands to blit the image buffer onto the
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103 // 2D drawing context of the HTML5 canvas
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104 EM_ASM({
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105 const data = new Uint8ClampedArray(Module.HEAP8.buffer, $1, 4 * $2 * $3);
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106 const img = new ImageData(data, $2, $3);
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107 const ctx = document.getElementById(UTF8ToString($0)).getContext('2d');
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108 ctx.putImageData(img, 0, 0);
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109 },
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110 GetCanvasId().c_str(), // $0
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111 javascript_->GetBuffer(), // $1
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112 javascript_->GetWidth(), // $2
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113 javascript_->GetHeight()); // $3
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114 }
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115
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116
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117 void WebAssemblyCairoViewport::UpdateSize(ICompositor& compositor)
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118 {
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119 unsigned int width, height;
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120 GetCanvasSize(width, height);
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121 emscripten_set_canvas_element_size(GetCanvasCssSelector().c_str(), width, height);
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122
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123 dynamic_cast<CairoCompositor&>(compositor).UpdateSize(width, height);
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124 }
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125
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126
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127 WebAssemblyCairoViewport::WebAssemblyCairoViewport(
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128 const std::string& canvasId) :
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129 WebAssemblyViewport(canvasId)
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130 {
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131 unsigned int width, height;
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132 GetCanvasSize(width, height);
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133 emscripten_set_canvas_element_size(GetCanvasCssSelector().c_str(),
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134 width,
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135 height);
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136
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137 AcquireCompositor(new CairoCompositor(width, height));
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138 }
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139 }