Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Scene2D/Internals/OpenGLInfoPanelRenderer.cpp @ 1925:a7a77488ddb1
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Wed, 23 Mar 2022 14:21:22 +0100 |
parents | 7053b8a0aaec |
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594 | 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) 2017-2022 Osimis S.A., Belgium |
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6 * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium |
594 | 7 * |
8 * This program is free software: you can redistribute it and/or | |
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9 * modify it under the terms of the GNU Lesser General Public License |
594 | 10 * as published by the Free Software Foundation, either version 3 of |
11 * the License, or (at your option) any later version. | |
12 * | |
13 * This program is distributed in the hope that it will be useful, but | |
14 * WITHOUT ANY WARRANTY; without even the implied warranty of | |
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 * Lesser General Public License for more details. |
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17 * |
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18 * You should have received a copy of the GNU Lesser General Public |
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19 * License along with this program. If not, see |
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20 * <http://www.gnu.org/licenses/>. |
594 | 21 **/ |
22 | |
23 | |
24 #include "OpenGLInfoPanelRenderer.h" | |
25 | |
26 namespace OrthancStone | |
27 { | |
28 namespace Internals | |
29 { | |
30 void OpenGLInfoPanelRenderer::LoadTexture(const InfoPanelSceneLayer& layer) | |
31 { | |
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32 if (!context_.IsContextLost()) |
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33 { |
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34 context_.MakeCurrent(); |
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35 texture_.reset(new OpenGL::OpenGLTexture(context_)); |
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36 texture_->Load(layer.GetTexture(), layer.IsLinearInterpolation()); |
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37 applySceneRotation_ = layer.ShouldApplySceneRotation(); |
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38 anchor_ = layer.GetAnchor(); |
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39 } |
594 | 40 } |
41 | |
42 OpenGLInfoPanelRenderer::OpenGLInfoPanelRenderer(OpenGL::IOpenGLContext& context, | |
43 OpenGLColorTextureProgram& program, | |
44 const InfoPanelSceneLayer& layer) : | |
45 context_(context), | |
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46 program_(program), |
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47 anchor_(BitmapAnchor_TopLeft), |
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48 applySceneRotation_(false) |
594 | 49 { |
50 LoadTexture(layer); | |
51 } | |
52 | |
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53 void OpenGLInfoPanelRenderer::Render(const AffineTransform2D& transform, |
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54 unsigned int canvasWidth, |
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55 unsigned int canvasHeight) |
594 | 56 { |
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57 if (!context_.IsContextLost() && texture_.get() != NULL) |
594 | 58 { |
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59 int dx = 0, dy = 0; |
594 | 60 InfoPanelSceneLayer::ComputeAnchorLocation( |
61 dx, dy, anchor_, texture_->GetWidth(), texture_->GetHeight(), | |
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62 canvasWidth, canvasHeight); |
594 | 63 |
64 // The position of this type of layer is layer: Ignore the | |
65 // "transform" coming from the scene | |
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66 AffineTransform2D actualTransform = |
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67 AffineTransform2D::CreateOffset(dx, dy); |
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68 |
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69 if (applySceneRotation_) |
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70 { |
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71 // the transformation is as follows: |
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72 // - originally, the image is aligned so that its top left corner |
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73 // is at 0,0 |
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74 // - first, we translate the image by -w/2,-h/2 |
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75 // - then we rotate it, so that the next rotation will make the |
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76 // image rotate around its center. |
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77 // - then, we translate the image by +w/2,+h/2 to put it |
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78 // back in place |
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79 // - the fourth and last transform is the one that brings the |
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80 // image to its desired anchored location. |
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81 |
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82 int32_t halfWidth = |
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83 static_cast<int32_t>(0.5 * texture_->GetWidth()); |
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84 |
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85 int32_t halfHeight= |
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86 static_cast<int32_t>(0.5 * texture_->GetHeight()); |
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87 |
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88 AffineTransform2D translation1 = |
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89 AffineTransform2D::CreateOffset(-halfWidth, -halfHeight); |
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90 |
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91 const Matrix& sceneTransformM = transform.GetHomogeneousMatrix(); |
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92 Matrix r; |
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93 Matrix q; |
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94 LinearAlgebra::RQDecomposition3x3(r, q, sceneTransformM); |
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95 |
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96 // counterintuitively, q is the rotation and r is the upper |
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97 // triangular |
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98 AffineTransform2D rotation(q); |
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99 |
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100 AffineTransform2D translation2 = |
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101 AffineTransform2D::CreateOffset(halfWidth, halfHeight); |
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102 |
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103 // please note that the last argument is the 1st applied |
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104 // transformation (rationale: if arguments are a, b and c, then |
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105 // the resulting matrix is a*b*c: |
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106 // x2 = (a*b*c)*x1 = (a*(b*(c*x1))) (you can see that the result |
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107 // of c*x1 is transformed by b, and the result of b*c*x1 is trans- |
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108 // formed by a) |
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109 actualTransform = AffineTransform2D::Combine(actualTransform, |
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110 translation2, |
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111 rotation, |
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112 translation1); |
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113 } |
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114 |
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115 program_.Apply(*texture_, actualTransform, canvasWidth, canvasHeight, true); |
594 | 116 } |
117 } | |
118 } | |
119 } |