Mercurial > hg > orthanc-stone
annotate Framework/Viewport/CairoContext.cpp @ 378:814fa32e2fcc
refactoring
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 06 Nov 2018 14:21:02 +0100 |
parents | a7de01c8fd29 |
children | b70e9be013e4 |
rev | line source |
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0 | 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) 2017-2018 Osimis S.A., Belgium |
0 | 6 * |
7 * This program is free software: you can redistribute it and/or | |
47 | 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. | |
0 | 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 | |
47 | 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 | |
0 | 18 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
19 **/ | |
20 | |
21 | |
22 #include "CairoContext.h" | |
23 | |
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24 #include <Core/Logging.h> |
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25 #include <Core/OrthancException.h> |
0 | 26 |
339 | 27 |
0 | 28 namespace OrthancStone |
29 { | |
339 | 30 CairoContext::CairoContext(CairoSurface& surface) : |
31 width_(surface.GetWidth()), | |
32 height_(surface.GetHeight()) | |
0 | 33 { |
34 context_ = cairo_create(surface.GetObject()); | |
35 if (!context_) | |
36 { | |
37 LOG(ERROR) << "Cannot create Cairo drawing context"; | |
38 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); | |
39 } | |
40 } | |
41 | |
42 | |
43 CairoContext::~CairoContext() | |
44 { | |
45 if (context_ != NULL) | |
46 { | |
47 cairo_destroy(context_); | |
48 context_ = NULL; | |
49 } | |
50 } | |
51 | |
52 | |
53 void CairoContext::SetSourceColor(uint8_t red, | |
54 uint8_t green, | |
55 uint8_t blue) | |
56 { | |
57 cairo_set_source_rgb(context_, | |
58 static_cast<float>(red) / 255.0f, | |
59 static_cast<float>(green) / 255.0f, | |
60 static_cast<float>(blue) / 255.0f); | |
61 } | |
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62 |
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63 |
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64 class CairoContext::AlphaSurface : public boost::noncopyable |
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65 { |
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66 private: |
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67 cairo_surface_t *surface_; |
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68 |
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69 public: |
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70 AlphaSurface(unsigned int width, |
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71 unsigned int height) |
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72 { |
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73 surface_ = cairo_image_surface_create(CAIRO_FORMAT_A8, width, height); |
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74 |
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75 if (!surface_) |
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76 { |
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77 // Should never occur |
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78 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); |
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79 } |
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80 |
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81 if (cairo_surface_status(surface_) != CAIRO_STATUS_SUCCESS) |
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82 { |
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83 LOG(ERROR) << "Cannot create a Cairo surface"; |
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84 cairo_surface_destroy(surface_); |
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85 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); |
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86 } |
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87 } |
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88 |
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89 ~AlphaSurface() |
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90 { |
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91 cairo_surface_destroy(surface_); |
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92 } |
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93 |
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94 void GetAccessor(Orthanc::ImageAccessor& target) |
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95 { |
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96 target.AssignWritable(Orthanc::PixelFormat_Grayscale8, |
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97 cairo_image_surface_get_width(surface_), |
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98 cairo_image_surface_get_height(surface_), |
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99 cairo_image_surface_get_stride(surface_), |
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100 cairo_image_surface_get_data(surface_)); |
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101 } |
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102 |
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103 void Blit(cairo_t* cr, |
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104 double x, |
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105 double y) |
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106 { |
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107 cairo_surface_mark_dirty(surface_); |
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108 cairo_mask_surface(cr, surface_, x, y); |
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109 cairo_fill(cr); |
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110 } |
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111 }; |
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112 |
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113 |
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114 void CairoContext::DrawText(const Orthanc::Font& font, |
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115 const std::string& text, |
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116 double x, |
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117 double y, |
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118 BitmapAnchor anchor) |
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119 { |
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120 // Render a bitmap containing the text |
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121 unsigned int width, height; |
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122 font.ComputeTextExtent(width, height, text); |
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123 |
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124 AlphaSurface surface(width, height); |
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125 |
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126 Orthanc::ImageAccessor accessor; |
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127 surface.GetAccessor(accessor); |
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128 font.Draw(accessor, text, 0, 0, 255); |
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129 |
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130 // Correct the text location given the anchor location |
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131 double deltaX, deltaY; |
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132 ComputeAnchorTranslation(deltaX, deltaY, anchor, width, height); |
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133 |
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134 // Cancel zoom/rotation before blitting the text onto the surface |
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135 double pixelX = x; |
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136 double pixelY = y; |
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137 cairo_user_to_device(context_, &pixelX, &pixelY); |
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138 |
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139 cairo_save(context_); |
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140 cairo_identity_matrix(context_); |
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141 |
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142 // Blit the text bitmap |
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143 surface.Blit(context_, pixelX + deltaX, pixelY + deltaY); |
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144 cairo_restore(context_); |
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145 } |
0 | 146 } |