Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Scene2D/Internals/CairoInfoPanelRenderer.cpp @ 1596:4fb8fdf03314
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Mon, 26 Oct 2020 17:51:42 +0100 |
parents | 85e117739eca |
children | 8563ea5d8ae4 |
rev | line source |
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597 | 1 /** |
2 * Stone of Orthanc | |
3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics | |
4 * Department, University Hospital of Liege, Belgium | |
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium |
597 | 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. | |
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16 * |
597 | 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 "CairoInfoPanelRenderer.h" | |
23 | |
24 #include "../InfoPanelSceneLayer.h" | |
25 | |
26 namespace OrthancStone | |
27 { | |
28 namespace Internals | |
29 { | |
30 void CairoInfoPanelRenderer::Update(const ISceneLayer& layer) | |
31 { | |
32 const InfoPanelSceneLayer& l = dynamic_cast<const InfoPanelSceneLayer&>(layer); | |
33 | |
34 texture_.Copy(l.GetTexture(), true); | |
35 anchor_ = l.GetAnchor(); | |
36 isLinearInterpolation_ = l.IsLinearInterpolation(); | |
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37 applySceneRotation_ = l.ShouldApplySceneRotation(); |
597 | 38 } |
39 | |
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40 void CairoInfoPanelRenderer::Render(const AffineTransform2D& transform, |
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41 unsigned int canvasWidth, |
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42 unsigned int canvasHeight) |
597 | 43 { |
44 int dx, dy; | |
45 InfoPanelSceneLayer::ComputeAnchorLocation( | |
46 dx, dy, anchor_, texture_.GetWidth(), texture_.GetHeight(), | |
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47 canvasWidth, canvasHeight); |
597 | 48 |
49 cairo_t* cr = target_.GetCairoContext(); | |
50 cairo_save(cr); | |
51 | |
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52 if (applySceneRotation_) |
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53 { |
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54 // the transformation is as follows: |
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55 // - originally, the image is aligned so that its top left corner |
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56 // is at 0,0 |
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57 // - first, we translate the image by -w/2,-h/2 |
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58 // - then we rotate it, so that the next rotation will make the |
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59 // image rotate around its center. |
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60 // - then, we translate the image by +w/2,+h/2 to put it |
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61 // back in place |
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62 // - the fourth and last transform is the one that brings the |
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63 // image to its desired anchored location. |
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64 |
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65 int32_t halfWidth = |
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66 static_cast<int32_t>(0.5 * texture_.GetWidth()); |
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67 |
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68 int32_t halfHeight = |
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69 static_cast<int32_t>(0.5 * texture_.GetHeight()); |
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70 |
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71 const Matrix& sceneTransformM = transform.GetHomogeneousMatrix(); |
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72 Matrix r; |
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73 Matrix q; |
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74 LinearAlgebra::RQDecomposition3x3(r, q, sceneTransformM); |
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75 |
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76 // first, put the scene rotation in a cairo matrix |
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77 cairo_matrix_t m; |
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78 cairo_matrix_init( |
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79 &m, q(0, 0), q(1, 0), q(0, 1), q(1, 1), q(0, 2), q(1, 2)); |
597 | 80 |
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81 // now let's build the transform piece by piece |
1571 | 82 // first translation (directly written in `t`) |
83 cairo_matrix_t t; | |
84 cairo_matrix_init_identity(&t); | |
85 cairo_matrix_translate(&t, -halfWidth, -halfHeight); | |
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86 |
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87 // then the rotation |
1571 | 88 cairo_matrix_multiply(&t, &t, &m); |
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89 |
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90 // then the second translation |
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91 { |
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92 cairo_matrix_t translation2; |
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93 cairo_matrix_init_translate(&translation2, halfWidth, halfHeight); |
1571 | 94 cairo_matrix_multiply(&t, &t, &m); |
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95 } |
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96 |
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97 // then the last translation |
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98 { |
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99 cairo_matrix_t translation3; |
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100 cairo_matrix_init_translate(&translation3, dx, dy); |
1571 | 101 cairo_matrix_multiply(&t, &t, &translation3); |
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102 } |
1571 | 103 cairo_transform(cr, &t); |
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104 } |
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105 else |
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106 { |
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107 cairo_matrix_t t; |
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108 cairo_matrix_init_identity(&t); |
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109 cairo_matrix_translate(&t, dx, dy); |
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110 cairo_transform(cr, &t); |
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111 } |
597 | 112 cairo_set_operator(cr, CAIRO_OPERATOR_OVER); |
113 cairo_set_source_surface(cr, texture_.GetObject(), 0, 0); | |
114 | |
115 if (isLinearInterpolation_) | |
116 { | |
117 cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_BILINEAR); | |
118 } | |
119 else | |
120 { | |
121 cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_NEAREST); | |
122 } | |
123 | |
124 cairo_paint(cr); | |
125 | |
126 cairo_restore(cr); | |
127 } | |
128 } | |
129 } |