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annotate Core/Images/Font.cpp @ 2853:52b017d22a4f

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 02 Oct 2018 17:05:07 +0200
parents 878b59270859
children 668d5ad73c74
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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) 2017-2018 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 General Public License as
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9 * published by the Free Software Foundation, either version 3 of the
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10 * License, or (at your option) any later version.
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11 *
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12 * In addition, as a special exception, the copyright holders of this
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13 * program give permission to link the code of its release with the
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14 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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15 * that use the same license as the "OpenSSL" library), and distribute
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16 * the linked executables. You must obey the GNU General Public License
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17 * in all respects for all of the code used other than "OpenSSL". If you
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18 * modify file(s) with this exception, you may extend this exception to
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19 * your version of the file(s), but you are not obligated to do so. If
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20 * you do not wish to do so, delete this exception statement from your
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21 * version. If you delete this exception statement from all source files
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22 * in the program, then also delete it here.
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23 *
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24 * This program is distributed in the hope that it will be useful, but
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25 * WITHOUT ANY WARRANTY; without even the implied warranty of
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26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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27 * General Public License for more details.
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28 *
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29 * You should have received a copy of the GNU General Public License
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30 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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31 **/
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32
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33
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34 #include "../PrecompiledHeaders.h"
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35 #include "Font.h"
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36
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37 #if !defined(ORTHANC_ENABLE_LOCALE)
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38 # error ORTHANC_ENABLE_LOCALE must be defined to use this file
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39 #endif
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40
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41 #if ORTHANC_SANDBOXED == 0
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42 # include "../SystemToolbox.h"
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43 #endif
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44
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45 #include "../Toolbox.h"
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46 #include "../OrthancException.h"
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47
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48 #include <stdio.h>
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49 #include <memory>
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50 #include <boost/lexical_cast.hpp>
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51
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52 namespace Orthanc
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53 {
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54 Font::~Font()
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55 {
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56 for (Characters::iterator it = characters_.begin();
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57 it != characters_.end(); ++it)
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58 {
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59 delete it->second;
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60 }
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61 }
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62
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63
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64 void Font::LoadFromMemory(const std::string& font)
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65 {
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66 Json::Value v;
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67 Json::Reader reader;
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68 if (!reader.parse(font, v) ||
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69 v.type() != Json::objectValue ||
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70 !v.isMember("Name") ||
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71 !v.isMember("Size") ||
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72 !v.isMember("Characters") ||
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73 v["Name"].type() != Json::stringValue ||
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74 v["Size"].type() != Json::intValue ||
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75 v["Characters"].type() != Json::objectValue)
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76 {
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77 throw OrthancException(ErrorCode_BadFont);
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78 }
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79
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80 name_ = v["Name"].asString();
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81 size_ = v["Size"].asUInt();
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82 maxHeight_ = 0;
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83
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84 Json::Value::Members characters = v["Characters"].getMemberNames();
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85
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86 for (size_t i = 0; i < characters.size(); i++)
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87 {
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88 const Json::Value& info = v["Characters"][characters[i]];
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89 if (info.type() != Json::objectValue ||
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90 !info.isMember("Advance") ||
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91 !info.isMember("Bitmap") ||
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92 !info.isMember("Height") ||
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93 !info.isMember("Top") ||
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94 !info.isMember("Width") ||
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95 info["Advance"].type() != Json::intValue ||
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96 info["Bitmap"].type() != Json::arrayValue ||
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97 info["Height"].type() != Json::intValue ||
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98 info["Top"].type() != Json::intValue ||
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99 info["Width"].type() != Json::intValue)
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100 {
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101 throw OrthancException(ErrorCode_BadFont);
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102 }
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103
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104 std::auto_ptr<Character> c(new Character);
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105
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106 c->advance_ = info["Advance"].asUInt();
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107 c->height_ = info["Height"].asUInt();
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108 c->top_ = info["Top"].asUInt();
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109 c->width_ = info["Width"].asUInt();
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110 c->bitmap_.resize(info["Bitmap"].size());
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111
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112 if (c->height_ > maxHeight_)
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113 {
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114 maxHeight_ = c->height_;
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115 }
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116
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117 for (Json::Value::ArrayIndex j = 0; j < info["Bitmap"].size(); j++)
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118 {
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119 if (info["Bitmap"][j].type() != Json::intValue)
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120 {
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121 throw OrthancException(ErrorCode_BadFont);
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122 }
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123
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124 int value = info["Bitmap"][j].asInt();
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125 if (value < 0 || value > 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 c->bitmap_[j] = static_cast<uint8_t>(value);
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131 }
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132
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133 int index = boost::lexical_cast<int>(characters[i]);
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134 if (index < 0 || index > 255)
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135 {
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136 throw OrthancException(ErrorCode_BadFont);
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137 }
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138
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139 characters_[static_cast<char>(index)] = c.release();
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140 }
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141 }
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142
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143
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144 #if ORTHANC_SANDBOXED == 0
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145 void Font::LoadFromFile(const std::string& path)
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146 {
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147 std::string font;
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148 SystemToolbox::ReadFile(font, path);
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149 LoadFromMemory(font);
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150 }
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diff changeset
151 #endif
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152
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153
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154 static unsigned int MyMin(unsigned int a,
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155 unsigned int b)
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156 {
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157 return a < b ? a : b;
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158 }
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159
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160
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161 void Font::DrawCharacter(ImageAccessor& target,
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162 const Character& character,
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163 int x,
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164 int y,
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165 const uint8_t color[4]) const
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166 {
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167 // Compute the bounds of the character
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168 if (x >= static_cast<int>(target.GetWidth()) ||
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169 y >= static_cast<int>(target.GetHeight()))
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170 {
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171 // The character is out of the image
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172 return;
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173 }
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174
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175 unsigned int left = x < 0 ? -x : 0;
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176 unsigned int top = y < 0 ? -y : 0;
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177 unsigned int width = MyMin(character.width_, target.GetWidth() - x);
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178 unsigned int height = MyMin(character.height_, target.GetHeight() - y);
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179
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180 unsigned int bpp = target.GetBytesPerPixel();
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181
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182 // Blit the font bitmap OVER the target image
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183 // https://en.wikipedia.org/wiki/Alpha_compositing
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184
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185 for (unsigned int cy = top; cy < height; cy++)
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186 {
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187 uint8_t* p = reinterpret_cast<uint8_t*>(target.GetRow(y + cy)) + (x + left) * bpp;
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188 unsigned int pos = cy * character.width_ + left;
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189
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190 switch (target.GetFormat())
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191 {
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192 case PixelFormat_Grayscale8:
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193 {
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194 assert(bpp == 1);
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195 for (unsigned int cx = left; cx < width; cx++, pos++, p++)
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196 {
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197 uint16_t alpha = character.bitmap_[pos];
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198 uint16_t value = alpha * static_cast<uint16_t>(color[0]) + (255 - alpha) * static_cast<uint16_t>(*p);
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199 *p = static_cast<uint8_t>(value >> 8);
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200 }
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201
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202 break;
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203 }
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204
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205 case PixelFormat_RGB24:
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206 {
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207 assert(bpp == 3);
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208 for (unsigned int cx = left; cx < width; cx++, pos++, p += 3)
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209 {
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210 uint16_t alpha = character.bitmap_[pos];
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diff changeset
211 for (uint8_t i = 0; i < 3; i++)
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212 {
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213 uint16_t value = alpha * static_cast<uint16_t>(color[i]) + (255 - alpha) * static_cast<uint16_t>(p[i]);
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214 p[i] = static_cast<uint8_t>(value >> 8);
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215 }
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216 }
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parents:
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217
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218 break;
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219 }
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220
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221 case PixelFormat_RGBA32:
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diff changeset
222 case PixelFormat_BGRA32:
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223 {
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diff changeset
224 assert(bpp == 4);
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225
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226 for (unsigned int cx = left; cx < width; cx++, pos++, p += 4)
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diff changeset
227 {
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diff changeset
228 float alpha = static_cast<float>(character.bitmap_[pos]) / 255.0f;
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229 float beta = (1.0f - alpha) * static_cast<float>(p[3]) / 255.0f;
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diff changeset
230 float denom = 1.0f / (alpha + beta);
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parents:
diff changeset
231
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parents:
diff changeset
232 for (uint8_t i = 0; i < 3; i++)
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parents:
diff changeset
233 {
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diff changeset
234 p[i] = static_cast<uint8_t>((alpha * static_cast<float>(color[i]) +
2dff2bdffdb8 font support within Orthanc
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diff changeset
235 beta * static_cast<float>(p[i])) * denom);
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parents:
diff changeset
236 }
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parents:
diff changeset
237
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diff changeset
238 p[3] = static_cast<uint8_t>(255.0f * (alpha + beta));
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parents:
diff changeset
239 }
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parents:
diff changeset
240
2dff2bdffdb8 font support within Orthanc
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parents:
diff changeset
241 break;
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parents:
diff changeset
242 }
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parents:
diff changeset
243
2dff2bdffdb8 font support within Orthanc
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parents:
diff changeset
244 default:
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diff changeset
245 throw OrthancException(ErrorCode_NotImplemented);
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parents:
diff changeset
246 }
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parents:
diff changeset
247 }
2dff2bdffdb8 font support within Orthanc
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parents:
diff changeset
248
2dff2bdffdb8 font support within Orthanc
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parents:
diff changeset
249 }
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parents:
diff changeset
250
2dff2bdffdb8 font support within Orthanc
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parents:
diff changeset
251
2dff2bdffdb8 font support within Orthanc
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diff changeset
252 void Font::DrawInternal(ImageAccessor& target,
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diff changeset
253 const std::string& utf8,
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parents:
diff changeset
254 int x,
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parents:
diff changeset
255 int y,
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diff changeset
256 const uint8_t color[4]) const
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diff changeset
257 {
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parents:
diff changeset
258 if (target.GetFormat() != PixelFormat_Grayscale8 &&
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diff changeset
259 target.GetFormat() != PixelFormat_RGB24 &&
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diff changeset
260 target.GetFormat() != PixelFormat_RGBA32 &&
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parents: 2447
diff changeset
261 target.GetFormat() != PixelFormat_BGRA32)
1610
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parents:
diff changeset
262 {
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diff changeset
263 throw OrthancException(ErrorCode_NotImplemented);
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parents:
diff changeset
264 }
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diff changeset
265
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diff changeset
266 int a = x;
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parents:
diff changeset
267
2379
4900688827a8 reorganization in CMake
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diff changeset
268 #if ORTHANC_ENABLE_LOCALE == 1
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269 std::string s = Toolbox::ConvertFromUtf8(utf8, Encoding_Latin1);
2379
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diff changeset
270 #else
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271 // If the locale support is disabled, simply drop non-ASCII
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272 // characters from the source UTF-8 string
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273 std::string s = Toolbox::ConvertToAscii(utf8);
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diff changeset
274 #endif
1610
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diff changeset
275
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diff changeset
276 for (size_t i = 0; i < s.size(); i++)
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parents:
diff changeset
277 {
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diff changeset
278 if (s[i] == '\n')
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parents:
diff changeset
279 {
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parents:
diff changeset
280 // Go to the next line
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parents:
diff changeset
281 a = x;
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diff changeset
282 y += maxHeight_ + 1;
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parents:
diff changeset
283 }
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284 else
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285 {
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286 Characters::const_iterator c = characters_.find(s[i]);
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287 if (c != characters_.end())
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288 {
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289 DrawCharacter(target, *c->second, a, y + static_cast<int>(c->second->top_), color);
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290 a += c->second->advance_;
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291 }
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292 }
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293 }
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294 }
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295
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296
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297 void Font::Draw(ImageAccessor& target,
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298 const std::string& utf8,
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299 int x,
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300 int y,
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301 uint8_t grayscale) const
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302 {
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303 uint8_t color[4] = { grayscale, grayscale, grayscale, 255 };
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304 DrawInternal(target, utf8, x, y, color);
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305 }
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306
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307
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308 void Font::Draw(ImageAccessor& target,
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309 const std::string& utf8,
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310 int x,
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311 int y,
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312 uint8_t r,
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313 uint8_t g,
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314 uint8_t b) const
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315 {
2853
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316 uint8_t color[4];
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317
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318 switch (target.GetFormat())
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319 {
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320 case PixelFormat_BGRA32:
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321 color[0] = b;
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322 color[1] = g;
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323 color[2] = r;
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324 color[3] = 255;
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325 break;
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326
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327 default:
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328 color[0] = r;
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329 color[1] = g;
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330 color[2] = b;
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331 color[3] = 255;
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332 break;
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333 }
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334
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335 DrawInternal(target, utf8, x, y, color);
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336 }
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337
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338 }