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annotate OrthancFramework/Sources/Images/Font.cpp @ 4119:bf7b9edf6b81 framework-lgpl

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re-licensing the OrthancFramework to LGPL, in order to license Stone of Orthanc under LGPL
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 07 Jul 2020 19:17:56 +0200
parents d25f4c0fa160
children 785a2713323e
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
1900
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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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22
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23 #include "../PrecompiledHeaders.h"
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24 #include "Font.h"
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25
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26 #if !defined(ORTHANC_ENABLE_LOCALE)
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27 # error ORTHANC_ENABLE_LOCALE must be defined to use this file
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28 #endif
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29
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30 #if ORTHANC_SANDBOXED == 0
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31 # include "../SystemToolbox.h"
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32 #endif
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33
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34 #include "../OrthancException.h"
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35 #include "../Toolbox.h"
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36 #include "Image.h"
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37 #include "ImageProcessing.h"
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38
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39 #include <stdio.h>
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40 #include <memory>
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41 #include <boost/lexical_cast.hpp>
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42
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43 namespace Orthanc
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44 {
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45 Font::~Font()
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46 {
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47 for (Characters::iterator it = characters_.begin();
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48 it != characters_.end(); ++it)
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49 {
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50 delete it->second;
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51 }
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52 }
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53
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54
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55 void Font::LoadFromMemory(const std::string& font)
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56 {
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57 Json::Value v;
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58 Json::Reader reader;
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59 if (!reader.parse(font, v) ||
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60 v.type() != Json::objectValue ||
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61 !v.isMember("Name") ||
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62 !v.isMember("Size") ||
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63 !v.isMember("Characters") ||
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64 v["Name"].type() != Json::stringValue ||
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65 v["Size"].type() != Json::intValue ||
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66 v["Characters"].type() != Json::objectValue)
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67 {
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68 throw OrthancException(ErrorCode_BadFont);
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69 }
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70
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71 name_ = v["Name"].asString();
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72 size_ = v["Size"].asUInt();
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73 maxHeight_ = 0;
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74
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75 Json::Value::Members characters = v["Characters"].getMemberNames();
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76
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77 for (size_t i = 0; i < characters.size(); i++)
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78 {
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79 const Json::Value& info = v["Characters"][characters[i]];
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80 if (info.type() != Json::objectValue ||
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81 !info.isMember("Advance") ||
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82 !info.isMember("Bitmap") ||
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83 !info.isMember("Height") ||
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84 !info.isMember("Top") ||
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85 !info.isMember("Width") ||
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86 info["Advance"].type() != Json::intValue ||
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87 info["Bitmap"].type() != Json::arrayValue ||
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88 info["Height"].type() != Json::intValue ||
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89 info["Top"].type() != Json::intValue ||
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90 info["Width"].type() != Json::intValue)
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91 {
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92 throw OrthancException(ErrorCode_BadFont);
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93 }
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94
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95 std::unique_ptr<Character> c(new Character);
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96
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97 c->advance_ = info["Advance"].asUInt();
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98 c->height_ = info["Height"].asUInt();
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99 c->top_ = info["Top"].asUInt();
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100 c->width_ = info["Width"].asUInt();
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101 c->bitmap_.resize(info["Bitmap"].size());
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102
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103 if (c->height_ > maxHeight_)
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104 {
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105 maxHeight_ = c->height_;
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106 }
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107
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108 for (Json::Value::ArrayIndex j = 0; j < info["Bitmap"].size(); j++)
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109 {
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110 if (info["Bitmap"][j].type() != Json::intValue)
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111 {
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112 throw OrthancException(ErrorCode_BadFont);
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113 }
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114
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115 int value = info["Bitmap"][j].asInt();
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116 if (value < 0 || value > 255)
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117 {
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118 throw OrthancException(ErrorCode_BadFont);
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119 }
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120
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121 c->bitmap_[j] = static_cast<uint8_t>(value);
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122 }
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123
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124 int index = boost::lexical_cast<int>(characters[i]);
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125 if (index < 0 || index > 255)
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126 {
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127 throw OrthancException(ErrorCode_BadFont);
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128 }
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129
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130 characters_[static_cast<char>(index)] = c.release();
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131 }
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132 }
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133
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134
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135 #if ORTHANC_SANDBOXED == 0
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136 void Font::LoadFromFile(const std::string& path)
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137 {
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138 std::string font;
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diff changeset
139 SystemToolbox::ReadFile(font, path);
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140 LoadFromMemory(font);
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141 }
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142 #endif
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143
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144
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diff changeset
145 static unsigned int MyMin(unsigned int a,
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diff changeset
146 unsigned int b)
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147 {
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148 return a < b ? a : b;
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149 }
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150
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151
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diff changeset
152 void Font::DrawCharacter(ImageAccessor& target,
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153 const Character& character,
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154 int x,
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155 int y,
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156 const uint8_t color[4]) const
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157 {
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158 // Compute the bounds of the character
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159 if (x >= static_cast<int>(target.GetWidth()) ||
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160 y >= static_cast<int>(target.GetHeight()))
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161 {
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162 // The character is out of the image
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163 return;
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164 }
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165
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166 unsigned int left = x < 0 ? -x : 0;
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167 unsigned int top = y < 0 ? -y : 0;
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168 unsigned int width = MyMin(character.width_, target.GetWidth() - x);
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169 unsigned int height = MyMin(character.height_, target.GetHeight() - y);
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170
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171 unsigned int bpp = target.GetBytesPerPixel();
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172
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173 // Blit the font bitmap OVER the target image
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174 // https://en.wikipedia.org/wiki/Alpha_compositing
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175
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176 for (unsigned int cy = top; cy < height; cy++)
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177 {
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178 uint8_t* p = reinterpret_cast<uint8_t*>(target.GetRow(y + cy)) + (x + left) * bpp;
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179 unsigned int pos = cy * character.width_ + left;
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180
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181 switch (target.GetFormat())
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182 {
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183 case PixelFormat_Grayscale8:
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184 {
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185 assert(bpp == 1);
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186 for (unsigned int cx = left; cx < width; cx++, pos++, p++)
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187 {
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188 uint16_t alpha = character.bitmap_[pos];
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189 uint16_t value = alpha * static_cast<uint16_t>(color[0]) + (255 - alpha) * static_cast<uint16_t>(*p);
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190 *p = static_cast<uint8_t>(value >> 8);
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191 }
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192
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193 break;
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194 }
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195
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196 case PixelFormat_RGB24:
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197 {
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198 assert(bpp == 3);
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199 for (unsigned int cx = left; cx < width; cx++, pos++, p += 3)
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200 {
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201 uint16_t alpha = character.bitmap_[pos];
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202 for (uint8_t i = 0; i < 3; i++)
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203 {
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204 uint16_t value = alpha * static_cast<uint16_t>(color[i]) + (255 - alpha) * static_cast<uint16_t>(p[i]);
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205 p[i] = static_cast<uint8_t>(value >> 8);
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206 }
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207 }
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208
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209 break;
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210 }
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211
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212 case PixelFormat_RGBA32:
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213 case PixelFormat_BGRA32:
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214 {
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diff changeset
215 assert(bpp == 4);
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216
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217 for (unsigned int cx = left; cx < width; cx++, pos++, p += 4)
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218 {
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219 float alpha = static_cast<float>(character.bitmap_[pos]) / 255.0f;
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220 float beta = (1.0f - alpha) * static_cast<float>(p[3]) / 255.0f;
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diff changeset
221 float denom = 1.0f / (alpha + beta);
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222
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223 for (uint8_t i = 0; i < 3; i++)
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diff changeset
224 {
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diff changeset
225 p[i] = static_cast<uint8_t>((alpha * static_cast<float>(color[i]) +
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diff changeset
226 beta * static_cast<float>(p[i])) * denom);
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227 }
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parents:
diff changeset
228
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diff changeset
229 p[3] = static_cast<uint8_t>(255.0f * (alpha + beta));
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parents:
diff changeset
230 }
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parents:
diff changeset
231
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parents:
diff changeset
232 break;
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parents:
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233 }
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parents:
diff changeset
234
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parents:
diff changeset
235 default:
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236 throw OrthancException(ErrorCode_NotImplemented);
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parents:
diff changeset
237 }
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diff changeset
238 }
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parents:
diff changeset
239
2dff2bdffdb8 font support within Orthanc
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parents:
diff changeset
240 }
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parents:
diff changeset
241
2dff2bdffdb8 font support within Orthanc
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parents:
diff changeset
242
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diff changeset
243 void Font::DrawInternal(ImageAccessor& target,
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diff changeset
244 const std::string& utf8,
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diff changeset
245 int x,
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diff changeset
246 int y,
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diff changeset
247 const uint8_t color[4]) const
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248 {
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diff changeset
249 if (target.GetFormat() != PixelFormat_Grayscale8 &&
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diff changeset
250 target.GetFormat() != PixelFormat_RGB24 &&
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diff changeset
251 target.GetFormat() != PixelFormat_RGBA32 &&
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diff changeset
252 target.GetFormat() != PixelFormat_BGRA32)
1610
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diff changeset
253 {
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diff changeset
254 throw OrthancException(ErrorCode_NotImplemented);
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parents:
diff changeset
255 }
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parents:
diff changeset
256
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diff changeset
257 int a = x;
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diff changeset
258
2379
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parents: 2244
diff changeset
259 #if ORTHANC_ENABLE_LOCALE == 1
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260 std::string s = Toolbox::ConvertFromUtf8(utf8, Encoding_Latin1);
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diff changeset
261 #else
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262 // If the locale support is disabled, simply drop non-ASCII
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263 // characters from the source UTF-8 string
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diff changeset
264 std::string s = Toolbox::ConvertToAscii(utf8);
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diff changeset
265 #endif
1610
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diff changeset
266
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diff changeset
267 for (size_t i = 0; i < s.size(); i++)
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268 {
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diff changeset
269 if (s[i] == '\n')
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diff changeset
270 {
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diff changeset
271 // Go to the next line
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parents:
diff changeset
272 a = x;
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diff changeset
273 y += maxHeight_ + 1;
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parents:
diff changeset
274 }
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parents:
diff changeset
275 else
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parents:
diff changeset
276 {
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diff changeset
277 Characters::const_iterator c = characters_.find(s[i]);
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parents:
diff changeset
278 if (c != characters_.end())
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parents:
diff changeset
279 {
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parents:
diff changeset
280 DrawCharacter(target, *c->second, a, y + static_cast<int>(c->second->top_), color);
2dff2bdffdb8 font support within Orthanc
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parents:
diff changeset
281 a += c->second->advance_;
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282 }
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283 }
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284 }
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285 }
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286
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287
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288 void Font::Draw(ImageAccessor& target,
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289 const std::string& utf8,
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290 int x,
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291 int y,
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292 uint8_t grayscale) const
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293 {
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294 uint8_t color[4] = { grayscale, grayscale, grayscale, 255 };
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295 DrawInternal(target, utf8, x, y, color);
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296 }
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297
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298
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299 void Font::Draw(ImageAccessor& target,
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300 const std::string& utf8,
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301 int x,
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302 int y,
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303 uint8_t r,
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304 uint8_t g,
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305 uint8_t b) const
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306 {
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307 uint8_t color[4];
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308
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309 switch (target.GetFormat())
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310 {
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311 case PixelFormat_BGRA32:
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312 color[0] = b;
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313 color[1] = g;
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314 color[2] = r;
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315 color[3] = 255;
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316 break;
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317
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318 default:
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319 color[0] = r;
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320 color[1] = g;
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321 color[2] = b;
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322 color[3] = 255;
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323 break;
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324 }
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325
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326 DrawInternal(target, utf8, x, y, color);
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327 }
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328
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329
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330 void Font::ComputeTextExtent(unsigned int& width,
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331 unsigned int& height,
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332 const std::string& utf8) const
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333 {
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334 width = 0;
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335 height = 0;
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336
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337 #if ORTHANC_ENABLE_LOCALE == 1
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338 std::string s = Toolbox::ConvertFromUtf8(utf8, Encoding_Latin1);
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339 #else
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340 // If the locale support is disabled, simply drop non-ASCII
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341 // characters from the source UTF-8 string
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342 std::string s = Toolbox::ConvertToAscii(utf8);
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343 #endif
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344
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345 // Compute the text extent
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346 unsigned int x = 0;
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347 unsigned int y = 0;
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348
668d5ad73c74 Font::Render()
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349 for (size_t i = 0; i < s.size(); i++)
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350 {
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351 if (s[i] == '\n')
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352 {
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353 // Go to the next line
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354 x = 0;
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355 y += (maxHeight_ + 1);
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356 }
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357 else
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358 {
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359 Characters::const_iterator c = characters_.find(s[i]);
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360 if (c != characters_.end())
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361 {
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362 x += c->second->advance_;
668d5ad73c74 Font::Render()
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363
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364 unsigned int bottom = y + c->second->top_ + c->second->height_;
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365 if (bottom > height)
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366 {
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367 height = bottom;
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368 }
668d5ad73c74 Font::Render()
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369
668d5ad73c74 Font::Render()
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370 if (x > width)
668d5ad73c74 Font::Render()
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371 {
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372 width = x;
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373 }
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374 }
668d5ad73c74 Font::Render()
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375 }
668d5ad73c74 Font::Render()
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376 }
668d5ad73c74 Font::Render()
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377 }
668d5ad73c74 Font::Render()
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378
668d5ad73c74 Font::Render()
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379
668d5ad73c74 Font::Render()
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diff changeset
380 ImageAccessor* Font::Render(const std::string& utf8,
668d5ad73c74 Font::Render()
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diff changeset
381 PixelFormat format,
668d5ad73c74 Font::Render()
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diff changeset
382 uint8_t r,
668d5ad73c74 Font::Render()
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diff changeset
383 uint8_t g,
668d5ad73c74 Font::Render()
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384 uint8_t b) const
668d5ad73c74 Font::Render()
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diff changeset
385 {
668d5ad73c74 Font::Render()
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diff changeset
386 unsigned int width, height;
668d5ad73c74 Font::Render()
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387 ComputeTextExtent(width, height, utf8);
668d5ad73c74 Font::Render()
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diff changeset
388
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diff changeset
389 std::unique_ptr<ImageAccessor> target(new Image(format, width, height, false));
2900
668d5ad73c74 Font::Render()
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diff changeset
390 ImageProcessing::Set(*target, 0, 0, 0, 255);
668d5ad73c74 Font::Render()
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diff changeset
391 Draw(*target, utf8, 0, 0, r, g, b);
668d5ad73c74 Font::Render()
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diff changeset
392
668d5ad73c74 Font::Render()
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diff changeset
393 return target.release();
668d5ad73c74 Font::Render()
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diff changeset
394 }
668d5ad73c74 Font::Render()
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diff changeset
395
668d5ad73c74 Font::Render()
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diff changeset
396
668d5ad73c74 Font::Render()
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diff changeset
397 ImageAccessor* Font::RenderAlpha(const std::string& utf8) const
668d5ad73c74 Font::Render()
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diff changeset
398 {
668d5ad73c74 Font::Render()
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diff changeset
399 unsigned int width, height;
668d5ad73c74 Font::Render()
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diff changeset
400 ComputeTextExtent(width, height, utf8);
668d5ad73c74 Font::Render()
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diff changeset
401
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diff changeset
402 std::unique_ptr<ImageAccessor> target(new Image(PixelFormat_Grayscale8, width, height, false));
2900
668d5ad73c74 Font::Render()
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diff changeset
403 ImageProcessing::Set(*target, 0);
668d5ad73c74 Font::Render()
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diff changeset
404 Draw(*target, utf8, 0, 0, 255);
668d5ad73c74 Font::Render()
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diff changeset
405
668d5ad73c74 Font::Render()
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diff changeset
406 return target.release();
668d5ad73c74 Font::Render()
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diff changeset
407 }
1610
2dff2bdffdb8 font support within Orthanc
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
408 }