Mercurial > hg > orthanc
annotate Core/Images/Font.cpp @ 2106:09cb73980740
fix
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Mon, 17 Oct 2016 15:36:50 +0200 |
parents | b1291df2f780 |
children | aa4b8895cd23 |
rev | line source |
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1 /** |
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2 * Orthanc - A Lightweight, RESTful DICOM Store |
1900 | 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 * |
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6 * This program is free software: you can redistribute it and/or |
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7 * modify it under the terms of the GNU General Public License as |
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8 * published by the Free Software Foundation, either version 3 of the |
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9 * License, or (at your option) any later version. |
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10 * |
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11 * In addition, as a special exception, the copyright holders of this |
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12 * program give permission to link the code of its release with the |
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it |
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14 * that use the same license as the "OpenSSL" library), and distribute |
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15 * the linked executables. You must obey the GNU General Public License |
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16 * in all respects for all of the code used other than "OpenSSL". If you |
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17 * modify file(s) with this exception, you may extend this exception to |
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18 * your version of the file(s), but you are not obligated to do so. If |
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19 * you do not wish to do so, delete this exception statement from your |
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20 * version. If you delete this exception statement from all source files |
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21 * in the program, then also delete it here. |
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22 * |
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23 * This program is distributed in the hope that it will be useful, but |
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of |
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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26 * General Public License for more details. |
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27 * |
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28 * You should have received a copy of the GNU General Public License |
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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30 **/ |
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31 |
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32 |
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33 #include "../PrecompiledHeaders.h" |
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34 #include "Font.h" |
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35 |
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36 #include "../Toolbox.h" |
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37 #include "../OrthancException.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(); |
1616 | 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::auto_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 void Font::LoadFromFile(const std::string& path) |
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136 { |
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137 std::string font; |
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138 Toolbox::ReadFile(font, path); |
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139 LoadFromMemory(font); |
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140 } |
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141 |
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142 |
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143 static unsigned int MyMin(unsigned int a, |
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144 unsigned int b) |
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145 { |
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146 return a < b ? a : b; |
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147 } |
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148 |
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149 |
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150 void Font::DrawCharacter(ImageAccessor& target, |
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151 const Character& character, |
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152 int x, |
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153 int y, |
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154 const uint8_t color[4]) const |
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155 { |
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156 // Compute the bounds of the character |
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157 if (x >= static_cast<int>(target.GetWidth()) || |
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158 y >= static_cast<int>(target.GetHeight())) |
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159 { |
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160 // The character is out of the image |
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161 return; |
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162 } |
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163 |
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164 unsigned int left = x < 0 ? -x : 0; |
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165 unsigned int top = y < 0 ? -y : 0; |
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166 unsigned int width = MyMin(character.width_, target.GetWidth() - x); |
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167 unsigned int height = MyMin(character.height_, target.GetHeight() - y); |
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168 |
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169 unsigned int bpp = target.GetBytesPerPixel(); |
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170 |
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171 // Blit the font bitmap OVER the target image |
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172 // https://en.wikipedia.org/wiki/Alpha_compositing |
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173 |
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174 for (unsigned int cy = top; cy < height; cy++) |
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175 { |
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176 uint8_t* p = reinterpret_cast<uint8_t*>(target.GetRow(y + cy)) + (x + left) * bpp; |
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177 unsigned int pos = cy * character.width_ + left; |
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178 |
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179 switch (target.GetFormat()) |
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180 { |
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181 case PixelFormat_Grayscale8: |
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182 { |
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183 assert(bpp == 1); |
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184 for (unsigned int cx = left; cx < width; cx++, pos++, p++) |
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185 { |
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186 uint16_t alpha = character.bitmap_[pos]; |
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187 uint16_t value = alpha * static_cast<uint16_t>(color[0]) + (255 - alpha) * static_cast<uint16_t>(*p); |
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188 *p = static_cast<uint8_t>(value >> 8); |
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189 } |
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190 |
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191 break; |
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192 } |
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193 |
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194 case PixelFormat_RGB24: |
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195 { |
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196 assert(bpp == 3); |
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197 for (unsigned int cx = left; cx < width; cx++, pos++, p += 3) |
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198 { |
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199 uint16_t alpha = character.bitmap_[pos]; |
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200 for (uint8_t i = 0; i < 3; i++) |
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201 { |
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202 uint16_t value = alpha * static_cast<uint16_t>(color[i]) + (255 - alpha) * static_cast<uint16_t>(p[i]); |
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203 p[i] = static_cast<uint8_t>(value >> 8); |
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204 } |
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205 } |
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206 |
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207 break; |
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208 } |
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209 |
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210 case PixelFormat_RGBA32: |
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211 { |
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212 assert(bpp == 4); |
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213 |
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214 for (unsigned int cx = left; cx < width; cx++, pos++, p += 4) |
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215 { |
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216 float alpha = static_cast<float>(character.bitmap_[pos]) / 255.0f; |
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217 float beta = (1.0f - alpha) * static_cast<float>(p[3]) / 255.0f; |
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218 float denom = 1.0f / (alpha + beta); |
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219 |
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220 for (uint8_t i = 0; i < 3; i++) |
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221 { |
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222 p[i] = static_cast<uint8_t>((alpha * static_cast<float>(color[i]) + |
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223 beta * static_cast<float>(p[i])) * denom); |
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224 } |
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225 |
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226 p[3] = static_cast<uint8_t>(255.0f * (alpha + beta)); |
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227 } |
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228 |
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229 break; |
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230 } |
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231 |
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232 default: |
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233 throw OrthancException(ErrorCode_NotImplemented); |
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234 } |
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235 } |
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236 |
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237 } |
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238 |
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239 |
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240 void Font::DrawInternal(ImageAccessor& target, |
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241 const std::string& utf8, |
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242 int x, |
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243 int y, |
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244 const uint8_t color[4]) const |
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245 { |
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246 if (target.GetFormat() != PixelFormat_Grayscale8 && |
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247 target.GetFormat() != PixelFormat_RGB24 && |
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248 target.GetFormat() != PixelFormat_RGBA32) |
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249 { |
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250 throw OrthancException(ErrorCode_NotImplemented); |
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251 } |
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252 |
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253 int a = x; |
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254 |
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255 std::string s = Toolbox::ConvertFromUtf8(utf8, Encoding_Latin1); |
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256 |
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257 for (size_t i = 0; i < s.size(); i++) |
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258 { |
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259 if (s[i] == '\n') |
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260 { |
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261 // Go to the next line |
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262 a = x; |
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263 y += maxHeight_ + 1; |
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264 } |
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265 else |
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266 { |
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267 Characters::const_iterator c = characters_.find(s[i]); |
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268 if (c != characters_.end()) |
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269 { |
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270 DrawCharacter(target, *c->second, a, y + static_cast<int>(c->second->top_), color); |
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271 a += c->second->advance_; |
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272 } |
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273 } |
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274 } |
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275 } |
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276 |
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277 |
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278 void Font::Draw(ImageAccessor& target, |
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279 const std::string& utf8, |
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280 int x, |
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281 int y, |
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282 uint8_t grayscale) const |
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283 { |
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284 uint8_t color[4] = { grayscale, grayscale, grayscale, 255 }; |
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285 DrawInternal(target, utf8, x, y, color); |
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286 } |
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287 |
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288 |
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289 void Font::Draw(ImageAccessor& target, |
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290 const std::string& utf8, |
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291 int x, |
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292 int y, |
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293 uint8_t r, |
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294 uint8_t g, |
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295 uint8_t b) const |
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296 { |
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297 uint8_t color[4] = { r, g, b, 255 }; |
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298 DrawInternal(target, utf8, x, y, color); |
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299 } |
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300 |
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301 } |