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annotate OrthancStone/Sources/Wrappers/CairoContext.cpp @ 1949:d3ae6858e77b

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more consistent handling of numberOfFrames
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 15 Jul 2022 16:19:18 +0200
parents 7053b8a0aaec
children 07964689cb0b
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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
1871
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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
0
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7 *
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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
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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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/>.
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21 **/
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22
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23
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24 #include "CairoContext.h"
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25
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26 #include <Logging.h>
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27 #include <OrthancException.h>
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29
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30 namespace OrthancStone
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31 {
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32 CairoContext::CairoContext(CairoSurface& surface) :
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33 width_(surface.GetWidth()),
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34 height_(surface.GetHeight())
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35 {
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36 context_ = cairo_create(surface.GetObject());
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37 if (!context_)
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38 {
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39 LOG(ERROR) << "Cannot create Cairo drawing context";
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40 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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41 }
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42 }
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44
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45 CairoContext::~CairoContext()
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46 {
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47 if (context_ != NULL)
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48 {
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49 cairo_destroy(context_);
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50 context_ = NULL;
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51 }
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52 }
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54
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55 void CairoContext::SetSourceColor(uint8_t red,
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56 uint8_t green,
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57 uint8_t blue)
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58 {
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59 cairo_set_source_rgb(context_,
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60 static_cast<float>(red) / 255.0f,
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61 static_cast<float>(green) / 255.0f,
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62 static_cast<float>(blue) / 255.0f);
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63 }
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65
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66 class CairoContext::AlphaSurface : public boost::noncopyable
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67 {
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68 private:
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69 cairo_surface_t *surface_;
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70
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71 public:
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72 AlphaSurface(unsigned int width,
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73 unsigned int height)
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74 {
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75 surface_ = cairo_image_surface_create(CAIRO_FORMAT_A8, width, height);
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76
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77 if (!surface_)
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78 {
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79 // Should never occur
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80 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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81 }
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82
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83 if (cairo_surface_status(surface_) != CAIRO_STATUS_SUCCESS)
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84 {
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85 LOG(ERROR) << "Cannot create a Cairo surface";
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86 cairo_surface_destroy(surface_);
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87 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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88 }
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89 }
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90
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91 ~AlphaSurface()
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92 {
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93 cairo_surface_destroy(surface_);
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94 }
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95
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96 void GetAccessor(Orthanc::ImageAccessor& target)
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97 {
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98 target.AssignWritable(Orthanc::PixelFormat_Grayscale8,
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99 cairo_image_surface_get_width(surface_),
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100 cairo_image_surface_get_height(surface_),
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101 cairo_image_surface_get_stride(surface_),
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102 cairo_image_surface_get_data(surface_));
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103 }
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104
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105 void Blit(cairo_t* cr,
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106 double x,
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107 double y)
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108 {
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109 cairo_surface_mark_dirty(surface_);
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110 cairo_mask_surface(cr, surface_, x, y);
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111 cairo_fill(cr);
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112 }
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113 };
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114
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115
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116 void CairoContext::DrawText(const Orthanc::Font& font,
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117 const std::string& text,
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118 double x,
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119 double y,
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120 BitmapAnchor anchor)
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121 {
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122 // Render a bitmap containing the text
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123 unsigned int width, height;
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124 font.ComputeTextExtent(width, height, text);
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125
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126 AlphaSurface surface(width, height);
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127
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128 Orthanc::ImageAccessor accessor;
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129 surface.GetAccessor(accessor);
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130 font.Draw(accessor, text, 0, 0, 255);
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131
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132 // Correct the text location given the anchor location
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133 double deltaX, deltaY;
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134 ComputeAnchorTranslation(deltaX, deltaY, anchor, width, height);
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135
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136 // Cancel zoom/rotation before blitting the text onto the surface
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137 double pixelX = x;
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138 double pixelY = y;
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139 cairo_user_to_device(context_, &pixelX, &pixelY);
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140
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141 cairo_save(context_);
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142 cairo_identity_matrix(context_);
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143
366
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144 // Blit the text bitmap
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145 surface.Blit(context_, pixelX + deltaX, pixelY + deltaY);
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146 cairo_restore(context_);
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147 }
0
351ab0da0150 initial commit
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148 }