Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Scene2D/Internals/CairoInfoPanelRenderer.cpp @ 1739:9ac2a65d4172
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| author | Sebastien Jodogne <s.jodogne@gmail.com> |
|---|---|
| date | Wed, 06 Jan 2021 17:50:00 +0100 |
| parents | 8563ea5d8ae4 |
| children | 3889ae96d2e9 |
| 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) 2017-2021 Osimis S.A., Belgium |
| 597 | 6 * |
| 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 Lesser General Public License |
| 597 | 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 | |
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 * Lesser 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 Lesser General Public |
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18 * License along with this program. If not, see |
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19 * <http://www.gnu.org/licenses/>. |
| 597 | 20 **/ |
| 21 | |
| 22 | |
| 23 #include "CairoInfoPanelRenderer.h" | |
| 24 | |
| 25 #include "../InfoPanelSceneLayer.h" | |
| 26 | |
| 27 namespace OrthancStone | |
| 28 { | |
| 29 namespace Internals | |
| 30 { | |
| 31 void CairoInfoPanelRenderer::Update(const ISceneLayer& layer) | |
| 32 { | |
| 33 const InfoPanelSceneLayer& l = dynamic_cast<const InfoPanelSceneLayer&>(layer); | |
| 34 | |
| 35 texture_.Copy(l.GetTexture(), true); | |
| 36 anchor_ = l.GetAnchor(); | |
| 37 isLinearInterpolation_ = l.IsLinearInterpolation(); | |
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38 applySceneRotation_ = l.ShouldApplySceneRotation(); |
| 597 | 39 } |
| 40 | |
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41 void CairoInfoPanelRenderer::Render(const AffineTransform2D& transform, |
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42 unsigned int canvasWidth, |
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43 unsigned int canvasHeight) |
| 597 | 44 { |
| 45 int dx, dy; | |
| 46 InfoPanelSceneLayer::ComputeAnchorLocation( | |
| 47 dx, dy, anchor_, texture_.GetWidth(), texture_.GetHeight(), | |
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48 canvasWidth, canvasHeight); |
| 597 | 49 |
| 50 cairo_t* cr = target_.GetCairoContext(); | |
| 51 cairo_save(cr); | |
| 52 | |
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53 if (applySceneRotation_) |
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54 { |
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55 // the transformation is as follows: |
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56 // - originally, the image is aligned so that its top left corner |
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57 // is at 0,0 |
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58 // - first, we translate the image by -w/2,-h/2 |
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59 // - then we rotate it, so that the next rotation will make the |
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60 // image rotate around its center. |
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61 // - then, we translate the image by +w/2,+h/2 to put it |
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62 // back in place |
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63 // - the fourth and last transform is the one that brings the |
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64 // image to its desired anchored location. |
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65 |
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66 int32_t halfWidth = |
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67 static_cast<int32_t>(0.5 * texture_.GetWidth()); |
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68 |
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69 int32_t halfHeight = |
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70 static_cast<int32_t>(0.5 * texture_.GetHeight()); |
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71 |
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72 const Matrix& sceneTransformM = transform.GetHomogeneousMatrix(); |
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73 Matrix r; |
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74 Matrix q; |
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75 LinearAlgebra::RQDecomposition3x3(r, q, sceneTransformM); |
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76 |
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77 // first, put the scene rotation in a cairo matrix |
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78 cairo_matrix_t m; |
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79 cairo_matrix_init( |
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80 &m, q(0, 0), q(1, 0), q(0, 1), q(1, 1), q(0, 2), q(1, 2)); |
| 597 | 81 |
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82 // now let's build the transform piece by piece |
| 1571 | 83 // first translation (directly written in `t`) |
| 84 cairo_matrix_t t; | |
| 85 cairo_matrix_init_identity(&t); | |
| 86 cairo_matrix_translate(&t, -halfWidth, -halfHeight); | |
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87 |
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88 // then the rotation |
| 1571 | 89 cairo_matrix_multiply(&t, &t, &m); |
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90 |
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91 // then the second translation |
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92 { |
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93 cairo_matrix_t translation2; |
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94 cairo_matrix_init_translate(&translation2, halfWidth, halfHeight); |
| 1571 | 95 cairo_matrix_multiply(&t, &t, &m); |
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96 } |
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97 |
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98 // then the last translation |
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99 { |
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100 cairo_matrix_t translation3; |
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101 cairo_matrix_init_translate(&translation3, dx, dy); |
| 1571 | 102 cairo_matrix_multiply(&t, &t, &translation3); |
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103 } |
| 1571 | 104 cairo_transform(cr, &t); |
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105 } |
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106 else |
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107 { |
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108 cairo_matrix_t t; |
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109 cairo_matrix_init_identity(&t); |
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110 cairo_matrix_translate(&t, dx, dy); |
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111 cairo_transform(cr, &t); |
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112 } |
| 597 | 113 cairo_set_operator(cr, CAIRO_OPERATOR_OVER); |
| 114 cairo_set_source_surface(cr, texture_.GetObject(), 0, 0); | |
| 115 | |
| 116 if (isLinearInterpolation_) | |
| 117 { | |
| 118 cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_BILINEAR); | |
| 119 } | |
| 120 else | |
| 121 { | |
| 122 cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_NEAREST); | |
| 123 } | |
| 124 | |
| 125 cairo_paint(cr); | |
| 126 | |
| 127 cairo_restore(cr); | |
| 128 } | |
| 129 } | |
| 130 } |