Mercurial > hg > orthanc-stone

annotate Framework/Wrappers/CairoContext.cpp @ 888:6e888cf6a48b

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renderers now have access to canvas width/height
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 10 Jul 2019 11:58:38 +0200
parents c237e0625065
children 2d8ab34c8c91
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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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b70e9be013e4 preparing for 2019
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5 * Copyright (C) 2017-2019 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 Affero 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 * Affero 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 Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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21
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22 #include "CairoContext.h"
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23
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24 #include <Core/Logging.h>
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25 #include <Core/OrthancException.h>
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27
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28 namespace OrthancStone
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29 {
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30 CairoContext::CairoContext(CairoSurface& surface) :
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31 width_(surface.GetWidth()),
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32 height_(surface.GetHeight())
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33 {
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34 context_ = cairo_create(surface.GetObject());
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35 if (!context_)
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36 {
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37 LOG(ERROR) << "Cannot create Cairo drawing context";
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38 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
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39 }
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40 }
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42
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43 CairoContext::~CairoContext()
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44 {
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45 if (context_ != NULL)
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46 {
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47 cairo_destroy(context_);
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48 context_ = NULL;
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49 }
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50 }
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52
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53 void CairoContext::SetSourceColor(uint8_t red,
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54 uint8_t green,
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55 uint8_t blue)
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56 {
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57 cairo_set_source_rgb(context_,
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58 static_cast<float>(red) / 255.0f,
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59 static_cast<float>(green) / 255.0f,
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60 static_cast<float>(blue) / 255.0f);
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61 }
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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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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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parents: 339
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137 cairo_user_to_device(context_, &pixelX, &pixelY);
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parents: 339
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138
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parents: 339
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139 cairo_save(context_);
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parents: 339
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140 cairo_identity_matrix(context_);
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Sebastien Jodogne <s.jodogne@gmail.com>
parents: 339
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141
366
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Sebastien Jodogne <s.jodogne@gmail.com>
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142 // Blit the text bitmap
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143 surface.Blit(context_, pixelX + deltaX, pixelY + deltaY);
365
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parents: 339
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144 cairo_restore(context_);
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parents: 339
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145 }
0
351ab0da0150 initial commit
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parents:
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146 }