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annotate Applications/Platforms/WebAssembly/WebAssemblyCairoViewport.cpp @ 1652:fa9e6bf84958

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integrating pdf.js into Stone Web viewer
author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 16 Nov 2020 20:47:53 +0100
parents 228a41233540
children 9ac2a65d4172
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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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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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31 # include <Scene2DViewport/ViewportController.h>
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32 #endif
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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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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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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 }