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annotate Applications/Platforms/WebAssembly/WebAssemblyCairoViewport.cpp @ 1870:3889ae96d2e9

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added copyright UCLouvain
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:04:09 +0100
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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) 2017-2021 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2021 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Affero General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Affero General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Affero General Public License
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19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 **/
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22
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23 #if defined(ORTHANC_BUILDING_STONE_LIBRARY) && ORTHANC_BUILDING_STONE_LIBRARY == 1
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24 # include "WebAssemblyCairoViewport.h"
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25 # include "../../../OrthancStone/Sources/Scene2D/CairoCompositor.h"
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26 # include "../../../OrthancStone/Sources/Scene2DViewport/ViewportController.h"
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27 #else
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28 // This is the case when using the WebAssembly side module, and this
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29 // source file must be compiled within the WebAssembly main module
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30 # include <Viewport/WebAssemblyCairoViewport.h>
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31 # include <Scene2D/CairoCompositor.h>
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32 # include <Scene2DViewport/ViewportController.h>
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33 #endif
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34
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36 #include <Images/Image.h>
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37
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38 namespace OrthancStone
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39 {
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40 void WebAssemblyCairoViewport::Paint(ICompositor& compositor,
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41 ViewportController& controller)
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42 {
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43 compositor.Refresh(controller.GetScene());
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44
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45 // Create a temporary memory buffer for the canvas in JavaScript
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46 Orthanc::ImageAccessor cairo;
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47 dynamic_cast<CairoCompositor&>(compositor).GetCanvas().GetReadOnlyAccessor(cairo);
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48
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49 const unsigned int width = cairo.GetWidth();
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50 const unsigned int height = cairo.GetHeight();
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51
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52 if (javascript_.get() == NULL ||
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53 javascript_->GetWidth() != width ||
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54 javascript_->GetHeight() != height)
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55 {
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56 javascript_.reset(new Orthanc::Image(Orthanc::PixelFormat_RGBA32, width, height,
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57 true /* force minimal pitch */));
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58 }
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59
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60 // Convert from BGRA32 memory layout (only color mode supported
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61 // by Cairo, which corresponds to CAIRO_FORMAT_ARGB32) to RGBA32
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62 // (as expected by HTML5 canvas). This simply amounts to
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63 // swapping the B and R channels. Alpha channel is also set to
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64 // full opacity (255).
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65 uint8_t* q = reinterpret_cast<uint8_t*>(javascript_->GetBuffer());
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66 for (unsigned int y = 0; y < height; y++)
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67 {
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68 const uint8_t* p = reinterpret_cast<const uint8_t*>(cairo.GetConstRow(y));
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69 for (unsigned int x = 0; x < width; x++)
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70 {
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71 q[0] = p[2]; // R
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72 q[1] = p[1]; // G
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73 q[2] = p[0]; // B
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74 q[3] = 255; // A
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75
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76 p += 4;
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77 q += 4;
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78 }
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79 }
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80
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81 if (width != 0 &&
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82 height != 0)
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83 {
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84 // Execute JavaScript commands to blit the image buffer onto the
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85 // 2D drawing context of the HTML5 canvas
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86 EM_ASM({
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87 const data = new Uint8ClampedArray(Module.HEAP8.buffer, $1, 4 * $2 * $3);
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88 const img = new ImageData(data, $2, $3);
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89 const ctx = document.getElementById(UTF8ToString($0)).getContext('2d');
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90 ctx.putImageData(img, 0, 0);
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91 },
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92 GetCanvasId().c_str(), // $0
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93 javascript_->GetBuffer(), // $1
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94 javascript_->GetWidth(), // $2
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95 javascript_->GetHeight()); // $3
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96 }
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97 }
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98
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99
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100 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvasId,
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101 bool enableEmscriptenMouseEvents) :
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102 WebAssemblyViewport(canvasId,enableEmscriptenMouseEvents)
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103 {
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104 RefreshCanvasSize();
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105 AcquireCompositor(new CairoCompositor(GetCanvasWidth(), GetCanvasHeight()));
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106 }
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107
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108
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109 boost::shared_ptr<WebAssemblyCairoViewport> WebAssemblyCairoViewport::Create(
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110 const std::string& canvasId, bool enableEmscriptenMouseEvents)
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111 {
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112 boost::shared_ptr<WebAssemblyCairoViewport> that = boost::shared_ptr<WebAssemblyCairoViewport>(
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113 new WebAssemblyCairoViewport(canvasId, enableEmscriptenMouseEvents));
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114
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115 that->WebAssemblyViewport::PostConstructor();
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116 return that;
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117 }
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118 }