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annotate Core/Images/Font.cpp @ 2260:a7a4fd44286c

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updated changes
author amazy
date Thu, 02 Feb 2017 21:18:59 +0100
parents a3a65de1840f
children 4900688827a8
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1 /**
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2 * Orthanc - A Lightweight, RESTful DICOM Store
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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 Osimis, 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 #include "../SystemToolbox.h"
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38 #include "../Toolbox.h"
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39 #include "../OrthancException.h"
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40
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41 #include <stdio.h>
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42 #include <memory>
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43 #include <boost/lexical_cast.hpp>
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44
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45 namespace Orthanc
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46 {
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47 Font::~Font()
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48 {
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49 for (Characters::iterator it = characters_.begin();
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50 it != characters_.end(); ++it)
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51 {
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52 delete it->second;
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53 }
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54 }
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55
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56
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57 void Font::LoadFromMemory(const std::string& font)
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58 {
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59 Json::Value v;
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60 Json::Reader reader;
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61 if (!reader.parse(font, v) ||
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62 v.type() != Json::objectValue ||
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63 !v.isMember("Name") ||
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64 !v.isMember("Size") ||
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65 !v.isMember("Characters") ||
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66 v["Name"].type() != Json::stringValue ||
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67 v["Size"].type() != Json::intValue ||
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68 v["Characters"].type() != Json::objectValue)
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69 {
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70 throw OrthancException(ErrorCode_BadFont);
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71 }
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72
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73 name_ = v["Name"].asString();
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74 size_ = v["Size"].asUInt();
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75 maxHeight_ = 0;
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76
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77 Json::Value::Members characters = v["Characters"].getMemberNames();
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78
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79 for (size_t i = 0; i < characters.size(); i++)
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80 {
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81 const Json::Value& info = v["Characters"][characters[i]];
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82 if (info.type() != Json::objectValue ||
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83 !info.isMember("Advance") ||
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84 !info.isMember("Bitmap") ||
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85 !info.isMember("Height") ||
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86 !info.isMember("Top") ||
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87 !info.isMember("Width") ||
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88 info["Advance"].type() != Json::intValue ||
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89 info["Bitmap"].type() != Json::arrayValue ||
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90 info["Height"].type() != Json::intValue ||
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91 info["Top"].type() != Json::intValue ||
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92 info["Width"].type() != Json::intValue)
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93 {
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94 throw OrthancException(ErrorCode_BadFont);
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95 }
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96
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97 std::auto_ptr<Character> c(new Character);
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98
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99 c->advance_ = info["Advance"].asUInt();
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100 c->height_ = info["Height"].asUInt();
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101 c->top_ = info["Top"].asUInt();
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102 c->width_ = info["Width"].asUInt();
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103 c->bitmap_.resize(info["Bitmap"].size());
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104
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105 if (c->height_ > maxHeight_)
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106 {
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107 maxHeight_ = c->height_;
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108 }
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109
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110 for (Json::Value::ArrayIndex j = 0; j < info["Bitmap"].size(); j++)
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111 {
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112 if (info["Bitmap"][j].type() != Json::intValue)
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113 {
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114 throw OrthancException(ErrorCode_BadFont);
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115 }
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116
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117 int value = info["Bitmap"][j].asInt();
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118 if (value < 0 || value > 255)
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119 {
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120 throw OrthancException(ErrorCode_BadFont);
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121 }
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122
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123 c->bitmap_[j] = static_cast<uint8_t>(value);
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124 }
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125
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126 int index = boost::lexical_cast<int>(characters[i]);
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127 if (index < 0 || index > 255)
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128 {
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129 throw OrthancException(ErrorCode_BadFont);
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130 }
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131
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132 characters_[static_cast<char>(index)] = c.release();
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133 }
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134 }
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135
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136
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137 void Font::LoadFromFile(const std::string& path)
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138 {
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139 std::string font;
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140 SystemToolbox::ReadFile(font, path);
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141 LoadFromMemory(font);
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142 }
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143
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144
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145 static unsigned int MyMin(unsigned int a,
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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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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 }
1610
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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 {
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214 assert(bpp == 4);
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215
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216 for (unsigned int cx = left; cx < width; cx++, pos++, p += 4)
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217 {
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218 float alpha = static_cast<float>(character.bitmap_[pos]) / 255.0f;
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219 float beta = (1.0f - alpha) * static_cast<float>(p[3]) / 255.0f;
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220 float denom = 1.0f / (alpha + beta);
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221
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222 for (uint8_t i = 0; i < 3; i++)
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223 {
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224 p[i] = static_cast<uint8_t>((alpha * static_cast<float>(color[i]) +
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225 beta * static_cast<float>(p[i])) * denom);
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226 }
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227
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228 p[3] = static_cast<uint8_t>(255.0f * (alpha + beta));
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229 }
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parents:
diff changeset
230
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231 break;
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232 }
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233
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234 default:
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235 throw OrthancException(ErrorCode_NotImplemented);
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236 }
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237 }
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238
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parents:
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239 }
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parents:
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240
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241
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242 void Font::DrawInternal(ImageAccessor& target,
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243 const std::string& utf8,
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244 int x,
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245 int y,
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246 const uint8_t color[4]) const
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247 {
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248 if (target.GetFormat() != PixelFormat_Grayscale8 &&
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249 target.GetFormat() != PixelFormat_RGB24 &&
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250 target.GetFormat() != PixelFormat_RGBA32)
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diff changeset
251 {
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252 throw OrthancException(ErrorCode_NotImplemented);
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253 }
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254
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255 int a = x;
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256
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257 std::string s = Toolbox::ConvertFromUtf8(utf8, Encoding_Latin1);
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258
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259 for (size_t i = 0; i < s.size(); i++)
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260 {
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261 if (s[i] == '\n')
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262 {
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263 // Go to the next line
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264 a = x;
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265 y += maxHeight_ + 1;
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266 }
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267 else
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268 {
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diff changeset
269 Characters::const_iterator c = characters_.find(s[i]);
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270 if (c != characters_.end())
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diff changeset
271 {
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diff changeset
272 DrawCharacter(target, *c->second, a, y + static_cast<int>(c->second->top_), color);
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273 a += c->second->advance_;
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274 }
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275 }
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parents:
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276 }
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parents:
diff changeset
277 }
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parents:
diff changeset
278
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279
1611
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diff changeset
280 void Font::Draw(ImageAccessor& target,
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281 const std::string& utf8,
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282 int x,
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283 int y,
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284 uint8_t grayscale) const
1610
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diff changeset
285 {
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286 uint8_t color[4] = { grayscale, grayscale, grayscale, 255 };
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287 DrawInternal(target, utf8, x, y, color);
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288 }
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289
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290
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291 void Font::Draw(ImageAccessor& target,
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292 const std::string& utf8,
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293 int x,
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294 int y,
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295 uint8_t r,
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296 uint8_t g,
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297 uint8_t b) const
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298 {
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299 uint8_t color[4] = { r, g, b, 255 };
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300 DrawInternal(target, utf8, x, y, color);
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301 }
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302
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303 }