Mercurial > hg > orthanc-stone
comparison Applications/Platforms/WebAssembly/WebAssemblyCairoViewport.cpp @ 1591:5887a4f8594b
moving platform-specific files out of the "OrthancStone" folder
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Fri, 23 Oct 2020 13:15:03 +0200 |
parents | OrthancStone/Sources/Viewport/WebAssemblyCairoViewport.cpp@92fca2b3ba3d |
children | 228a41233540 |
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1590:7b963bccafef | 1591:5887a4f8594b |
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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 #if defined(ORTHANC_BUILDING_STONE_LIBRARY) && ORTHANC_BUILDING_STONE_LIBRARY == 1 | |
23 # include "WebAssemblyCairoViewport.h" | |
24 # include "../../../OrthancStone/Sources/Scene2D/CairoCompositor.h" | |
25 # include "../../../OrthancStone/Sources/Scene2DViewport/ViewportController.h" | |
26 #else | |
27 // This is the case when using the WebAssembly side module, and this | |
28 // source file must be compiled within the WebAssembly main module | |
29 # include <Viewport/WebAssemblyCairoViewport.h> | |
30 # include <Scene2D/CairoCompositor.h> | |
31 # include <Scene2DViewport/ViewportController.h> | |
32 #endif | |
33 | |
34 | |
35 #include <Images/Image.h> | |
36 | |
37 namespace OrthancStone | |
38 { | |
39 void WebAssemblyCairoViewport::Paint(ICompositor& compositor, | |
40 ViewportController& controller) | |
41 { | |
42 compositor.Refresh(controller.GetScene()); | |
43 | |
44 // Create a temporary memory buffer for the canvas in JavaScript | |
45 Orthanc::ImageAccessor cairo; | |
46 dynamic_cast<CairoCompositor&>(compositor).GetCanvas().GetReadOnlyAccessor(cairo); | |
47 | |
48 const unsigned int width = cairo.GetWidth(); | |
49 const unsigned int height = cairo.GetHeight(); | |
50 | |
51 if (javascript_.get() == NULL || | |
52 javascript_->GetWidth() != width || | |
53 javascript_->GetHeight() != height) | |
54 { | |
55 javascript_.reset(new Orthanc::Image(Orthanc::PixelFormat_RGBA32, width, height, | |
56 true /* force minimal pitch */)); | |
57 } | |
58 | |
59 // Convert from BGRA32 memory layout (only color mode supported | |
60 // by Cairo, which corresponds to CAIRO_FORMAT_ARGB32) to RGBA32 | |
61 // (as expected by HTML5 canvas). This simply amounts to | |
62 // swapping the B and R channels. Alpha channel is also set to | |
63 // full opacity (255). | |
64 uint8_t* q = reinterpret_cast<uint8_t*>(javascript_->GetBuffer()); | |
65 for (unsigned int y = 0; y < height; y++) | |
66 { | |
67 const uint8_t* p = reinterpret_cast<const uint8_t*>(cairo.GetConstRow(y)); | |
68 for (unsigned int x = 0; x < width; x++) | |
69 { | |
70 q[0] = p[2]; // R | |
71 q[1] = p[1]; // G | |
72 q[2] = p[0]; // B | |
73 q[3] = 255; // A | |
74 | |
75 p += 4; | |
76 q += 4; | |
77 } | |
78 } | |
79 | |
80 // Execute JavaScript commands to blit the image buffer onto the | |
81 // 2D drawing context of the HTML5 canvas | |
82 EM_ASM({ | |
83 const data = new Uint8ClampedArray(Module.HEAP8.buffer, $1, 4 * $2 * $3); | |
84 const img = new ImageData(data, $2, $3); | |
85 const ctx = document.getElementById(UTF8ToString($0)).getContext('2d'); | |
86 ctx.putImageData(img, 0, 0); | |
87 }, | |
88 GetCanvasId().c_str(), // $0 | |
89 javascript_->GetBuffer(), // $1 | |
90 javascript_->GetWidth(), // $2 | |
91 javascript_->GetHeight()); // $3 | |
92 } | |
93 | |
94 | |
95 WebAssemblyCairoViewport::WebAssemblyCairoViewport(const std::string& canvasId, | |
96 bool enableEmscriptenMouseEvents) : | |
97 WebAssemblyViewport(canvasId,enableEmscriptenMouseEvents) | |
98 { | |
99 RefreshCanvasSize(); | |
100 AcquireCompositor(new CairoCompositor(GetCanvasWidth(), GetCanvasHeight())); | |
101 } | |
102 | |
103 | |
104 boost::shared_ptr<WebAssemblyCairoViewport> WebAssemblyCairoViewport::Create( | |
105 const std::string& canvasId, bool enableEmscriptenMouseEvents) | |
106 { | |
107 boost::shared_ptr<WebAssemblyCairoViewport> that = boost::shared_ptr<WebAssemblyCairoViewport>( | |
108 new WebAssemblyCairoViewport(canvasId, enableEmscriptenMouseEvents)); | |
109 | |
110 that->WebAssemblyViewport::PostConstructor(); | |
111 return that; | |
112 } | |
113 } |