annotate OrthancStone/Sources/Scene2D/Internals/CairoInfoPanelRenderer.cpp @ 1615:f5d4bd7b5593

new class: OsiriXLayerFactory
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 30 Oct 2020 17:26:44 +0100
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children 9ac2a65d4172
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2020 Osimis S.A., Belgium
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6 *
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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
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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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/>.
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20 **/
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21
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22
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23 #include "CairoInfoPanelRenderer.h"
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24
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25 #include "../InfoPanelSceneLayer.h"
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26
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27 namespace OrthancStone
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28 {
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29 namespace Internals
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30 {
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31 void CairoInfoPanelRenderer::Update(const ISceneLayer& layer)
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32 {
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33 const InfoPanelSceneLayer& l = dynamic_cast<const InfoPanelSceneLayer&>(layer);
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34
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35 texture_.Copy(l.GetTexture(), true);
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36 anchor_ = l.GetAnchor();
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37 isLinearInterpolation_ = l.IsLinearInterpolation();
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38 applySceneRotation_ = l.ShouldApplySceneRotation();
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39 }
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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)
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44 {
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45 int dx, dy;
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46 InfoPanelSceneLayer::ComputeAnchorLocation(
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47 dx, dy, anchor_, texture_.GetWidth(), texture_.GetHeight(),
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48 canvasWidth, canvasHeight);
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49
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50 cairo_t* cr = target_.GetCairoContext();
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51 cairo_save(cr);
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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));
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81
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82 // now let's build the transform piece by piece
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83 // first translation (directly written in `t`)
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84 cairo_matrix_t t;
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85 cairo_matrix_init_identity(&t);
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86 cairo_matrix_translate(&t, -halfWidth, -halfHeight);
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87
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88 // then the rotation
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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);
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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);
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102 cairo_matrix_multiply(&t, &t, &translation3);
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103 }
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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 }
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113 cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
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114 cairo_set_source_surface(cr, texture_.GetObject(), 0, 0);
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115
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116 if (isLinearInterpolation_)
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117 {
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118 cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_BILINEAR);
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119 }
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120 else
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121 {
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122 cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_NEAREST);
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123 }
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124
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125 cairo_paint(cr);
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126
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127 cairo_restore(cr);
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128 }
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129 }
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130 }