Mercurial > hg > orthanc-stone
annotate Applications/Platforms/WebAssembly/WebAssemblyCairoViewport.cpp @ 1865:4d83d27a955e
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 24 Nov 2021 12:25:32 +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 * |
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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 #if defined(ORTHANC_BUILDING_STONE_LIBRARY) && ORTHANC_BUILDING_STONE_LIBRARY == 1 |
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23 # include "WebAssemblyCairoViewport.h" |
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24 # include "../../../OrthancStone/Sources/Scene2D/CairoCompositor.h" |
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25 # include "../../../OrthancStone/Sources/Scene2DViewport/ViewportController.h" |
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26 #else |
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27 // This is the case when using the WebAssembly side module, and this |
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28 // source file must be compiled within the WebAssembly main module |
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29 # include <Viewport/WebAssemblyCairoViewport.h> |
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30 # include <Scene2D/CairoCompositor.h> |
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32 #endif |
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33 |
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35 #include <Images/Image.h> |
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36 |
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37 namespace OrthancStone |
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38 { |
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39 void WebAssemblyCairoViewport::Paint(ICompositor& compositor, |
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40 ViewportController& controller) |
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41 { |
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42 compositor.Refresh(controller.GetScene()); |
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43 |
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44 // Create a temporary memory buffer for the canvas in JavaScript |
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45 Orthanc::ImageAccessor cairo; |
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46 dynamic_cast<CairoCompositor&>(compositor).GetCanvas().GetReadOnlyAccessor(cairo); |
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47 |
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48 const unsigned int width = cairo.GetWidth(); |
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49 const unsigned int height = cairo.GetHeight(); |
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50 |
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51 if (javascript_.get() == NULL || |
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52 javascript_->GetWidth() != width || |
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53 javascript_->GetHeight() != height) |
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54 { |
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55 javascript_.reset(new Orthanc::Image(Orthanc::PixelFormat_RGBA32, width, height, |
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56 true /* force minimal pitch */)); |
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57 } |
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58 |
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59 // Convert from BGRA32 memory layout (only color mode supported |
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60 // by Cairo, which corresponds to CAIRO_FORMAT_ARGB32) to RGBA32 |
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61 // (as expected by HTML5 canvas). This simply amounts to |
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62 // swapping the B and R channels. Alpha channel is also set to |
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63 // full opacity (255). |
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64 uint8_t* q = reinterpret_cast<uint8_t*>(javascript_->GetBuffer()); |
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65 for (unsigned int y = 0; y < height; y++) |
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66 { |
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67 const uint8_t* p = reinterpret_cast<const uint8_t*>(cairo.GetConstRow(y)); |
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68 for (unsigned int x = 0; x < width; x++) |
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69 { |
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70 q[0] = p[2]; // R |
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71 q[1] = p[1]; // G |
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72 q[2] = p[0]; // B |
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73 q[3] = 255; // A |
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74 |
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75 p += 4; |
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76 q += 4; |
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77 } |
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78 } |
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79 |
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80 if (width != 0 && |
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81 height != 0) |
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82 { |
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83 // Execute JavaScript commands to blit the image buffer onto the |
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84 // 2D drawing context of the HTML5 canvas |
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85 EM_ASM({ |
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86 const data = new Uint8ClampedArray(Module.HEAP8.buffer, $1, 4 * $2 * $3); |
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87 const img = new ImageData(data, $2, $3); |
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88 const ctx = document.getElementById(UTF8ToString($0)).getContext('2d'); |
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89 ctx.putImageData(img, 0, 0); |
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90 }, |
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91 GetCanvasId().c_str(), // $0 |
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92 javascript_->GetBuffer(), // $1 |
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93 javascript_->GetWidth(), // $2 |
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94 javascript_->GetHeight()); // $3 |
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95 } |
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96 } |
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97 |
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98 |
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99 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvasId, |
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100 bool enableEmscriptenMouseEvents) : |
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101 WebAssemblyViewport(canvasId,enableEmscriptenMouseEvents) |
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102 { |
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103 RefreshCanvasSize(); |
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104 AcquireCompositor(new CairoCompositor(GetCanvasWidth(), GetCanvasHeight())); |
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105 } |
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106 |
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107 |
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108 boost::shared_ptr<WebAssemblyCairoViewport> WebAssemblyCairoViewport::Create( |
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109 const std::string& canvasId, bool enableEmscriptenMouseEvents) |
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110 { |
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111 boost::shared_ptr<WebAssemblyCairoViewport> that = boost::shared_ptr<WebAssemblyCairoViewport>( |
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112 new WebAssemblyCairoViewport(canvasId, enableEmscriptenMouseEvents)); |
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113 |
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114 that->WebAssemblyViewport::PostConstructor(); |
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115 return that; |
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116 } |
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117 } |