Mercurial > hg > orthanc-stone

annotate OrthancStone/Sources/Wrappers/CairoContext.cpp @ 1598:8563ea5d8ae4

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 26 Oct 2020 20:49:28 +0100
parents 4fb8fdf03314
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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23 #include "CairoContext.h"
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24
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25 #include <Logging.h>
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26 #include <OrthancException.h>
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29 namespace OrthancStone
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30 {
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31 CairoContext::CairoContext(CairoSurface& surface) :
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32 width_(surface.GetWidth()),
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33 height_(surface.GetHeight())
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34 {
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35 context_ = cairo_create(surface.GetObject());
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36 if (!context_)
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37 {
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38 LOG(ERROR) << "Cannot create Cairo drawing context";
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39 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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40 }
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41 }
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43
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44 CairoContext::~CairoContext()
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45 {
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46 if (context_ != NULL)
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47 {
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48 cairo_destroy(context_);
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49 context_ = NULL;
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50 }
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51 }
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53
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54 void CairoContext::SetSourceColor(uint8_t red,
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55 uint8_t green,
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56 uint8_t blue)
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57 {
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58 cairo_set_source_rgb(context_,
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59 static_cast<float>(red) / 255.0f,
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60 static_cast<float>(green) / 255.0f,
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61 static_cast<float>(blue) / 255.0f);
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62 }
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64
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65 class CairoContext::AlphaSurface : public boost::noncopyable
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66 {
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67 private:
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68 cairo_surface_t *surface_;
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69
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70 public:
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71 AlphaSurface(unsigned int width,
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72 unsigned int height)
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73 {
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74 surface_ = cairo_image_surface_create(CAIRO_FORMAT_A8, width, height);
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75
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76 if (!surface_)
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77 {
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78 // Should never occur
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79 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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80 }
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81
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82 if (cairo_surface_status(surface_) != CAIRO_STATUS_SUCCESS)
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83 {
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84 LOG(ERROR) << "Cannot create a Cairo surface";
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85 cairo_surface_destroy(surface_);
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86 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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87 }
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88 }
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89
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90 ~AlphaSurface()
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91 {
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92 cairo_surface_destroy(surface_);
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93 }
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94
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95 void GetAccessor(Orthanc::ImageAccessor& target)
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96 {
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97 target.AssignWritable(Orthanc::PixelFormat_Grayscale8,
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98 cairo_image_surface_get_width(surface_),
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99 cairo_image_surface_get_height(surface_),
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100 cairo_image_surface_get_stride(surface_),
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101 cairo_image_surface_get_data(surface_));
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102 }
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103
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104 void Blit(cairo_t* cr,
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105 double x,
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106 double y)
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107 {
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108 cairo_surface_mark_dirty(surface_);
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109 cairo_mask_surface(cr, surface_, x, y);
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110 cairo_fill(cr);
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111 }
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112 };
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113
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114
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115 void CairoContext::DrawText(const Orthanc::Font& font,
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116 const std::string& text,
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117 double x,
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118 double y,
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119 BitmapAnchor anchor)
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120 {
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121 // Render a bitmap containing the text
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122 unsigned int width, height;
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123 font.ComputeTextExtent(width, height, text);
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124
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125 AlphaSurface surface(width, height);
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126
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127 Orthanc::ImageAccessor accessor;
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128 surface.GetAccessor(accessor);
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129 font.Draw(accessor, text, 0, 0, 255);
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130
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131 // Correct the text location given the anchor location
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132 double deltaX, deltaY;
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133 ComputeAnchorTranslation(deltaX, deltaY, anchor, width, height);
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134
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135 // Cancel zoom/rotation before blitting the text onto the surface
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136 double pixelX = x;
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137 double pixelY = y;
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138 cairo_user_to_device(context_, &pixelX, &pixelY);
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139
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140 cairo_save(context_);
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141 cairo_identity_matrix(context_);
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142
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143 // Blit the text bitmap
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144 surface.Blit(context_, pixelX + deltaX, pixelY + deltaY);
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145 cairo_restore(context_);
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146 }
0
351ab0da0150 initial commit
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147 }