Mercurial > hg > orthanc
annotate OrthancFramework/Sources/Images/Font.cpp @ 4706:dbee8bd8ee1f
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author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Tue, 22 Jun 2021 09:13:03 +0200 |
parents | d9473bd5ed43 |
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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 * Copyright (C) 2017-2021 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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21 |
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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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35 #include "../Toolbox.h" |
2900 | 36 #include "Image.h" |
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 { |
4297 | 45 Font::Font() : |
46 size_(0), | |
47 maxHeight_(0) | |
48 { | |
49 } | |
50 | |
51 | |
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52 Font::~Font() |
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53 { |
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54 for (Characters::iterator it = characters_.begin(); |
1616 | 55 it != characters_.end(); ++it) |
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56 { |
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57 delete it->second; |
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58 } |
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59 } |
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60 |
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61 |
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62 void Font::LoadFromMemory(const std::string& font) |
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63 { |
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64 Json::Value v; |
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65 if (!Toolbox::ReadJson(v, font) || |
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66 v.type() != Json::objectValue || |
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67 !v.isMember("Name") || |
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68 !v.isMember("Size") || |
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69 !v.isMember("Characters") || |
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70 v["Name"].type() != Json::stringValue || |
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71 v["Size"].type() != Json::intValue || |
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72 v["Characters"].type() != Json::objectValue) |
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73 { |
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74 throw OrthancException(ErrorCode_BadFont); |
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75 } |
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76 |
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77 name_ = v["Name"].asString(); |
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78 size_ = v["Size"].asUInt(); |
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79 maxHeight_ = 0; |
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80 |
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81 Json::Value::Members characters = v["Characters"].getMemberNames(); |
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82 |
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83 for (size_t i = 0; i < characters.size(); i++) |
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84 { |
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85 const Json::Value& info = v["Characters"][characters[i]]; |
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86 if (info.type() != Json::objectValue || |
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87 !info.isMember("Advance") || |
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88 !info.isMember("Bitmap") || |
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89 !info.isMember("Height") || |
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90 !info.isMember("Top") || |
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91 !info.isMember("Width") || |
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92 info["Advance"].type() != Json::intValue || |
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93 info["Bitmap"].type() != Json::arrayValue || |
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94 info["Height"].type() != Json::intValue || |
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95 info["Top"].type() != Json::intValue || |
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96 info["Width"].type() != Json::intValue) |
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97 { |
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98 throw OrthancException(ErrorCode_BadFont); |
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99 } |
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100 |
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101 std::unique_ptr<Character> c(new Character); |
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102 |
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103 c->advance_ = info["Advance"].asUInt(); |
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104 c->height_ = info["Height"].asUInt(); |
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105 c->top_ = info["Top"].asUInt(); |
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106 c->width_ = info["Width"].asUInt(); |
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107 c->bitmap_.resize(info["Bitmap"].size()); |
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108 |
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109 if (c->height_ > maxHeight_) |
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110 { |
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111 maxHeight_ = c->height_; |
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112 } |
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113 |
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114 for (Json::Value::ArrayIndex j = 0; j < info["Bitmap"].size(); j++) |
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115 { |
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116 if (info["Bitmap"][j].type() != Json::intValue) |
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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 int value = info["Bitmap"][j].asInt(); |
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122 if (value < 0 || value > 255) |
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123 { |
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124 throw OrthancException(ErrorCode_BadFont); |
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125 } |
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126 |
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127 c->bitmap_[j] = static_cast<uint8_t>(value); |
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128 } |
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129 |
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130 int index = boost::lexical_cast<int>(characters[i]); |
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131 if (index < 0 || index > 255) |
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132 { |
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133 throw OrthancException(ErrorCode_BadFont); |
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134 } |
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135 |
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136 characters_[static_cast<char>(index)] = c.release(); |
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137 } |
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138 } |
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139 |
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140 |
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141 #if ORTHANC_SANDBOXED == 0 |
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142 void Font::LoadFromFile(const std::string& path) |
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143 { |
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144 std::string font; |
2140 | 145 SystemToolbox::ReadFile(font, path); |
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146 LoadFromMemory(font); |
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147 } |
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148 #endif |
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149 |
4297 | 150 const std::string &Font::GetName() const |
151 { | |
152 return name_; | |
153 } | |
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154 |
4297 | 155 unsigned int Font::GetSize() const |
156 { | |
157 return size_; | |
158 } | |
159 | |
160 | |
161 static unsigned int MyMin(unsigned int a, | |
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162 unsigned int b) |
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163 { |
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164 return a < b ? a : b; |
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165 } |
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166 |
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167 |
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168 void Font::DrawCharacter(ImageAccessor& target, |
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169 const Character& character, |
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170 int x, |
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171 int y, |
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172 const uint8_t color[4]) const |
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173 { |
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174 // Compute the bounds of the character |
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175 if (x >= static_cast<int>(target.GetWidth()) || |
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176 y >= static_cast<int>(target.GetHeight())) |
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177 { |
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178 // The character is out of the image |
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179 return; |
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180 } |
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181 |
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182 unsigned int left = x < 0 ? -x : 0; |
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183 unsigned int top = y < 0 ? -y : 0; |
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184 unsigned int width = MyMin(character.width_, target.GetWidth() - x); |
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185 unsigned int height = MyMin(character.height_, target.GetHeight() - y); |
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186 |
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187 unsigned int bpp = target.GetBytesPerPixel(); |
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188 |
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189 // Blit the font bitmap OVER the target image |
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190 // https://en.wikipedia.org/wiki/Alpha_compositing |
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191 |
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192 for (unsigned int cy = top; cy < height; cy++) |
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193 { |
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194 uint8_t* p = reinterpret_cast<uint8_t*>(target.GetRow(y + cy)) + (x + left) * bpp; |
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195 unsigned int pos = cy * character.width_ + left; |
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196 |
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197 switch (target.GetFormat()) |
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198 { |
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199 case PixelFormat_Grayscale8: |
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200 { |
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201 assert(bpp == 1); |
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202 for (unsigned int cx = left; cx < width; cx++, pos++, p++) |
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203 { |
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204 uint16_t alpha = character.bitmap_[pos]; |
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205 uint16_t value = alpha * static_cast<uint16_t>(color[0]) + (255 - alpha) * static_cast<uint16_t>(*p); |
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206 *p = static_cast<uint8_t>(value >> 8); |
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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_RGB24: |
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213 { |
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214 assert(bpp == 3); |
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215 for (unsigned int cx = left; cx < width; cx++, pos++, p += 3) |
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216 { |
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217 uint16_t alpha = character.bitmap_[pos]; |
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218 for (uint8_t i = 0; i < 3; i++) |
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219 { |
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220 uint16_t value = alpha * static_cast<uint16_t>(color[i]) + (255 - alpha) * static_cast<uint16_t>(p[i]); |
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221 p[i] = static_cast<uint8_t>(value >> 8); |
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222 } |
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223 } |
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224 |
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225 break; |
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226 } |
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227 |
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228 case PixelFormat_RGBA32: |
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229 case PixelFormat_BGRA32: |
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230 { |
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231 assert(bpp == 4); |
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232 |
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233 for (unsigned int cx = left; cx < width; cx++, pos++, p += 4) |
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234 { |
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235 float alpha = static_cast<float>(character.bitmap_[pos]) / 255.0f; |
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236 float beta = (1.0f - alpha) * static_cast<float>(p[3]) / 255.0f; |
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237 float denom = 1.0f / (alpha + beta); |
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238 |
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239 for (uint8_t i = 0; i < 3; i++) |
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240 { |
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241 p[i] = static_cast<uint8_t>((alpha * static_cast<float>(color[i]) + |
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242 beta * static_cast<float>(p[i])) * denom); |
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243 } |
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244 |
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245 p[3] = static_cast<uint8_t>(255.0f * (alpha + beta)); |
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246 } |
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247 |
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248 break; |
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249 } |
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250 |
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251 default: |
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252 throw OrthancException(ErrorCode_NotImplemented); |
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253 } |
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254 } |
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255 |
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256 } |
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257 |
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258 |
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259 void Font::DrawInternal(ImageAccessor& target, |
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260 const std::string& utf8, |
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261 int x, |
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262 int y, |
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263 const uint8_t color[4]) const |
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264 { |
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265 if (target.GetFormat() != PixelFormat_Grayscale8 && |
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266 target.GetFormat() != PixelFormat_RGB24 && |
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267 target.GetFormat() != PixelFormat_RGBA32 && |
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268 target.GetFormat() != PixelFormat_BGRA32) |
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269 { |
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270 throw OrthancException(ErrorCode_NotImplemented); |
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271 } |
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272 |
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273 int a = x; |
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274 |
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275 #if ORTHANC_ENABLE_LOCALE == 1 |
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276 std::string s = Toolbox::ConvertFromUtf8(utf8, Encoding_Latin1); |
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277 #else |
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278 // If the locale support is disabled, simply drop non-ASCII |
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279 // characters from the source UTF-8 string |
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280 std::string s = Toolbox::ConvertToAscii(utf8); |
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281 #endif |
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282 |
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283 for (size_t i = 0; i < s.size(); i++) |
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284 { |
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285 if (s[i] == '\n') |
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286 { |
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287 // Go to the next line |
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288 a = x; |
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289 y += maxHeight_ + 1; |
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290 } |
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291 else |
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292 { |
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293 Characters::const_iterator c = characters_.find(s[i]); |
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294 if (c != characters_.end()) |
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295 { |
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296 DrawCharacter(target, *c->second, a, y + static_cast<int>(c->second->top_), color); |
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297 a += c->second->advance_; |
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298 } |
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299 } |
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300 } |
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301 } |
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302 |
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303 |
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304 void Font::Draw(ImageAccessor& target, |
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305 const std::string& utf8, |
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306 int x, |
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307 int y, |
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308 uint8_t grayscale) const |
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309 { |
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310 uint8_t color[4] = { grayscale, grayscale, grayscale, 255 }; |
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311 DrawInternal(target, utf8, x, y, color); |
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312 } |
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313 |
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314 |
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315 void Font::Draw(ImageAccessor& target, |
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316 const std::string& utf8, |
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317 int x, |
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318 int y, |
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319 uint8_t r, |
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320 uint8_t g, |
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321 uint8_t b) const |
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322 { |
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323 uint8_t color[4]; |
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324 |
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325 switch (target.GetFormat()) |
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326 { |
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327 case PixelFormat_BGRA32: |
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328 color[0] = b; |
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329 color[1] = g; |
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330 color[2] = r; |
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331 color[3] = 255; |
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332 break; |
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333 |
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334 default: |
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335 color[0] = r; |
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336 color[1] = g; |
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337 color[2] = b; |
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338 color[3] = 255; |
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339 break; |
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340 } |
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341 |
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342 DrawInternal(target, utf8, x, y, color); |
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343 } |
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344 |
2900 | 345 |
346 void Font::ComputeTextExtent(unsigned int& width, | |
347 unsigned int& height, | |
348 const std::string& utf8) const | |
349 { | |
350 width = 0; | |
2914 | 351 height = 0; |
2900 | 352 |
353 #if ORTHANC_ENABLE_LOCALE == 1 | |
354 std::string s = Toolbox::ConvertFromUtf8(utf8, Encoding_Latin1); | |
355 #else | |
356 // If the locale support is disabled, simply drop non-ASCII | |
357 // characters from the source UTF-8 string | |
358 std::string s = Toolbox::ConvertToAscii(utf8); | |
359 #endif | |
360 | |
361 // Compute the text extent | |
362 unsigned int x = 0; | |
2901 | 363 unsigned int y = 0; |
2900 | 364 |
365 for (size_t i = 0; i < s.size(); i++) | |
366 { | |
367 if (s[i] == '\n') | |
368 { | |
369 // Go to the next line | |
370 x = 0; | |
2901 | 371 y += (maxHeight_ + 1); |
2900 | 372 } |
373 else | |
374 { | |
375 Characters::const_iterator c = characters_.find(s[i]); | |
376 if (c != characters_.end()) | |
377 { | |
378 x += c->second->advance_; | |
379 | |
2901 | 380 unsigned int bottom = y + c->second->top_ + c->second->height_; |
381 if (bottom > height) | |
2900 | 382 { |
2901 | 383 height = bottom; |
2900 | 384 } |
385 | |
386 if (x > width) | |
387 { | |
388 width = x; | |
389 } | |
390 } | |
391 } | |
392 } | |
393 } | |
394 | |
395 | |
396 ImageAccessor* Font::Render(const std::string& utf8, | |
397 PixelFormat format, | |
398 uint8_t r, | |
399 uint8_t g, | |
400 uint8_t b) const | |
401 { | |
402 unsigned int width, height; | |
403 ComputeTextExtent(width, height, utf8); | |
404 | |
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405 std::unique_ptr<ImageAccessor> target(new Image(format, width, height, false)); |
2900 | 406 ImageProcessing::Set(*target, 0, 0, 0, 255); |
407 Draw(*target, utf8, 0, 0, r, g, b); | |
408 | |
409 return target.release(); | |
410 } | |
411 | |
412 | |
413 ImageAccessor* Font::RenderAlpha(const std::string& utf8) const | |
414 { | |
415 unsigned int width, height; | |
416 ComputeTextExtent(width, height, utf8); | |
417 | |
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418 std::unique_ptr<ImageAccessor> target(new Image(PixelFormat_Grayscale8, width, height, false)); |
2900 | 419 ImageProcessing::Set(*target, 0); |
420 Draw(*target, utf8, 0, 0, 255); | |
421 | |
422 return target.release(); | |
423 } | |
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424 } |