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576
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1 /**
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2 * Stone of Orthanc
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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) 2017-2019 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 Affero 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 * Affero 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 Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "FontRenderer.h"
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23
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24 #include "../Toolbox/DynamicBitmap.h"
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25
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26 #include <Core/OrthancException.h>
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27
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28
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29 #include <ft2build.h>
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30 #include FT_FREETYPE_H
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31 #include FT_GLYPH_H
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32
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33
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34 // https://stackoverflow.com/questions/31161284/how-can-i-get-the-corresponding-error-string-from-an-ft-error-code
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35 static std::string GetErrorMessage(FT_Error err)
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36 {
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37 #undef __FTERRORS_H__
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38 #define FT_ERRORDEF( e, v, s ) case e: return s;
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39 #define FT_ERROR_START_LIST switch (err) {
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40 #define FT_ERROR_END_LIST }
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41 #include FT_ERRORS_H
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42 return "(Unknown error)";
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43 }
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44
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45
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46 static void CheckError(FT_Error err)
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47 {
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48 if (err != 0)
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49 {
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50 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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51 "Error in FreeType: " + GetErrorMessage(err));
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52 }
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53 }
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54
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55
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56 namespace OrthancStone
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57 {
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58 class FontRenderer::PImpl : public boost::noncopyable
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59 {
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60 private:
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61 std::string fontContent_;
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62 FT_Library library_;
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63 FT_Face face_;
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64
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65 void Clear()
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66 {
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67 if (face_ != NULL)
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68 {
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69 FT_Done_Face(face_);
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70 face_ = NULL;
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71 }
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72
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73 fontContent_.clear();
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74 }
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75
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76 public:
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77 PImpl() :
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78 library_(NULL),
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79 face_(NULL)
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80 {
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81 CheckError(FT_Init_FreeType(&library_));
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82 }
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83
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84
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85 ~PImpl()
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86 {
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87 Clear();
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88 FT_Done_FreeType(library_);
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89 }
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90
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91
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92 void LoadFont(const std::string& fontContent,
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93 unsigned int fontSize)
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94 {
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95 Clear();
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96
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97 // It is necessary to make a private copy of the font, as
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98 // Freetype makes the assumption that the buffer containing the
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99 // font is never deleted
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100 fontContent_.assign(fontContent);
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101
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102 const FT_Byte* data = reinterpret_cast<const FT_Byte*>(fontContent_.c_str());
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103
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104 CheckError(FT_New_Memory_Face(library_, data, fontContent_.size(), 0, &face_));
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105 CheckError(FT_Set_Char_Size(face_, // handle to face object
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106 0, // char_width in 1/64th of points
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107 fontSize * 64, // char_height in 1/64th of points
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108 72, // horizontal device resolution
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109 72)); // vertical device resolution
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110
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111 CheckError(FT_Select_Charmap(face_, FT_ENCODING_UNICODE));
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112 }
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113
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114
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115 Glyph* Render(uint32_t unicode)
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116 {
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117 if (face_ == NULL)
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118 {
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119 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls,
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120 "First call LoadFont()");
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121 }
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122 else if (FT_Load_Char(face_, unicode, FT_LOAD_RENDER) != 0)
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123 {
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124 // This character is not available
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125 return NULL;
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126 }
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127 else
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128 {
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129 if (face_->glyph->format != FT_GLYPH_FORMAT_BITMAP)
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130 {
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131 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented);
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132 //CheckError(FT_Glyph_To_Bitmap(&glyph, FT_RENDER_MODE_NORMAL, 0, 1));
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133 }
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134
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135 Orthanc::ImageAccessor bitmap;
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136 bitmap.AssignReadOnly(Orthanc::PixelFormat_Grayscale8,
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137 face_->glyph->bitmap.width,
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138 face_->glyph->bitmap.rows,
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139 face_->glyph->bitmap.pitch,
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140 face_->glyph->bitmap.buffer);
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141
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142 std::auto_ptr<Glyph> glyph(
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143 new Glyph(bitmap.GetWidth(),
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144 bitmap.GetHeight(),
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145 face_->glyph->bitmap_left,
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146 -face_->glyph->bitmap_top, // Positive for an upwards vertical distance
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147 face_->glyph->advance.x >> 6,
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148 face_->glyph->metrics.vertAdvance >> 6));
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149
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150 glyph->SetPayload(new DynamicBitmap(bitmap));
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151
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152 return glyph.release();
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153 }
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154 }
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155 };
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156
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157
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158
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159 FontRenderer::FontRenderer() :
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160 pimpl_(new PImpl)
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161 {
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162 }
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163
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164
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165 void FontRenderer::LoadFont(const std::string& fontContent,
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166 unsigned int fontSize)
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167 {
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168 pimpl_->LoadFont(fontContent, fontSize);
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169 }
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170
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171
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172 void FontRenderer::LoadFont(Orthanc::EmbeddedResources::FileResourceId resource,
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173 unsigned int fontSize)
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174 {
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175 std::string content;
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176 Orthanc::EmbeddedResources::GetFileResource(content, resource);
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177 LoadFont(content, fontSize);
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178 }
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179
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180
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181 Glyph* FontRenderer::Render(uint32_t unicode)
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182 {
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183 return pimpl_->Render(unicode);
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184 }
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185 }
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