Mercurial > hg > orthanc-stone
comparison OrthancStone/Sources/Viewport/WebAssemblyCairoViewport.cpp @ 1512:244ad1e4e76a
reorganization of folders
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 07 Jul 2020 16:21:02 +0200 |
parents | Framework/Viewport/WebAssemblyCairoViewport.cpp@4de884c95cd8 |
children | c54bc5bffd01 |
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1511:9dfeee74c1e6 | 1512:244ad1e4e76a |
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1 /** | |
2 * Stone of Orthanc | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
5 * Copyright (C) 2017-2020 Osimis S.A., Belgium | |
6 * | |
7 * This program is free software: you can redistribute it and/or | |
8 * modify it under the terms of the GNU Affero General Public License | |
9 * as published by the Free Software Foundation, either version 3 of | |
10 * the License, or (at your option) any later version. | |
11 * | |
12 * This program is distributed in the hope that it will be useful, but | |
13 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 * Affero General Public License for more details. | |
16 * | |
17 * You should have received a copy of the GNU Affero General Public License | |
18 * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 **/ | |
20 | |
21 | |
22 #include "WebAssemblyCairoViewport.h" | |
23 | |
24 #include "../Scene2D/CairoCompositor.h" | |
25 | |
26 #include <Images/Image.h> | |
27 | |
28 #include <boost/math/special_functions/round.hpp> | |
29 | |
30 namespace OrthancStone | |
31 { | |
32 void WebAssemblyCairoViewport::GetCanvasSize(unsigned int& width, | |
33 unsigned int& height) | |
34 { | |
35 double w, h; | |
36 emscripten_get_element_css_size(GetCanvasCssSelector().c_str(), &w, &h); | |
37 | |
38 /** | |
39 * Emscripten has the function emscripten_get_element_css_size() | |
40 * to query the width and height of a named HTML element. I'm | |
41 * calling this first to get the initial size of the canvas DOM | |
42 * element, and then call emscripten_set_canvas_size() to | |
43 * initialize the framebuffer size of the canvas to the same | |
44 * size as its DOM element. | |
45 * https://floooh.github.io/2017/02/22/emsc-html.html | |
46 **/ | |
47 if (w > 0 && | |
48 h > 0) | |
49 { | |
50 width = static_cast<unsigned int>(boost::math::iround(w)); | |
51 height = static_cast<unsigned int>(boost::math::iround(h)); | |
52 } | |
53 else | |
54 { | |
55 width = 0; | |
56 height = 0; | |
57 } | |
58 } | |
59 | |
60 | |
61 void WebAssemblyCairoViewport::Paint(ICompositor& compositor, | |
62 ViewportController& controller) | |
63 { | |
64 compositor.Refresh(controller.GetScene()); | |
65 | |
66 // Create a temporary memory buffer for the canvas in JavaScript | |
67 Orthanc::ImageAccessor cairo; | |
68 dynamic_cast<CairoCompositor&>(compositor).GetCanvas().GetReadOnlyAccessor(cairo); | |
69 | |
70 const unsigned int width = cairo.GetWidth(); | |
71 const unsigned int height = cairo.GetHeight(); | |
72 | |
73 if (javascript_.get() == NULL || | |
74 javascript_->GetWidth() != width || | |
75 javascript_->GetHeight() != height) | |
76 { | |
77 javascript_.reset(new Orthanc::Image(Orthanc::PixelFormat_RGBA32, width, height, | |
78 true /* force minimal pitch */)); | |
79 } | |
80 | |
81 // Convert from BGRA32 memory layout (only color mode supported | |
82 // by Cairo, which corresponds to CAIRO_FORMAT_ARGB32) to RGBA32 | |
83 // (as expected by HTML5 canvas). This simply amounts to | |
84 // swapping the B and R channels. Alpha channel is also set to | |
85 // full opacity (255). | |
86 uint8_t* q = reinterpret_cast<uint8_t*>(javascript_->GetBuffer()); | |
87 for (unsigned int y = 0; y < height; y++) | |
88 { | |
89 const uint8_t* p = reinterpret_cast<const uint8_t*>(cairo.GetConstRow(y)); | |
90 for (unsigned int x = 0; x < width; x++) | |
91 { | |
92 q[0] = p[2]; // R | |
93 q[1] = p[1]; // G | |
94 q[2] = p[0]; // B | |
95 q[3] = 255; // A | |
96 | |
97 p += 4; | |
98 q += 4; | |
99 } | |
100 } | |
101 | |
102 // Execute JavaScript commands to blit the image buffer onto the | |
103 // 2D drawing context of the HTML5 canvas | |
104 EM_ASM({ | |
105 const data = new Uint8ClampedArray(Module.HEAP8.buffer, $1, 4 * $2 * $3); | |
106 const img = new ImageData(data, $2, $3); | |
107 const ctx = document.getElementById(UTF8ToString($0)).getContext('2d'); | |
108 ctx.putImageData(img, 0, 0); | |
109 }, | |
110 GetCanvasId().c_str(), // $0 | |
111 javascript_->GetBuffer(), // $1 | |
112 javascript_->GetWidth(), // $2 | |
113 javascript_->GetHeight()); // $3 | |
114 } | |
115 | |
116 | |
117 void WebAssemblyCairoViewport::UpdateSize(ICompositor& compositor) | |
118 { | |
119 unsigned int width, height; | |
120 GetCanvasSize(width, height); | |
121 emscripten_set_canvas_element_size(GetCanvasCssSelector().c_str(), width, height); | |
122 | |
123 dynamic_cast<CairoCompositor&>(compositor).UpdateSize(width, height); | |
124 } | |
125 | |
126 | |
127 WebAssemblyCairoViewport::WebAssemblyCairoViewport( | |
128 const std::string& canvasId) : | |
129 WebAssemblyViewport(canvasId) | |
130 { | |
131 unsigned int width, height; | |
132 GetCanvasSize(width, height); | |
133 emscripten_set_canvas_element_size(GetCanvasCssSelector().c_str(), | |
134 width, | |
135 height); | |
136 | |
137 AcquireCompositor(new CairoCompositor(width, height)); | |
138 } | |
139 } |