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annotate Framework/Viewport/WebAssemblyCairoViewport.cpp @ 1351:1b8e37770d78 broker

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ID vs CSS selector distinction in API and field names.
author Benjamin Golinvaux <bgo@osimis.io>
date Wed, 15 Apr 2020 12:57:36 +0200
parents ab81ee8fce1f
children 30deba7bc8e2
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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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0ca50d275b9a upgrade to year 2020
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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 <Core/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 }