Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/tesseract/src/training/pango/pango_font_info.h @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
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1 /**********************************************************************
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2 * File: pango_font_info.h
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3 * Description: Font-related objects and helper functions
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4 * Author: Ranjith Unnikrishnan
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5 * Created: Mon Nov 18 2013
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6 *
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7 * (C) Copyright 2013, Google Inc.
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8 * Licensed under the Apache License, Version 2.0 (the "License");
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9 * you may not use this file except in compliance with the License.
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10 * You may obtain a copy of the License at
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11 * http://www.apache.org/licenses/LICENSE-2.0
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12 * Unless required by applicable law or agreed to in writing, software
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13 * distributed under the License is distributed on an "AS IS" BASIS,
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14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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15 * See the License for the specific language governing permissions and
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16 * limitations under the License.
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17 *
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18 **********************************************************************/
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20 #ifndef TESSERACT_TRAINING_PANGO_FONT_INFO_H_
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21 #define TESSERACT_TRAINING_PANGO_FONT_INFO_H_
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23 #include "export.h"
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25 #include "commandlineflags.h"
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27 #include "pango/pango-font.h"
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28 #include "pango/pango.h"
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29 #include "pango/pangocairo.h"
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31 #include <string>
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32 #include <unordered_map>
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33 #include <utility>
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34 #include <vector>
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36 using char32 = signed int;
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38 namespace tesseract {
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39
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40 // Data holder class for a font, intended to avoid having to work with Pango or
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41 // FontConfig-specific objects directly.
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42 class TESS_PANGO_TRAINING_API PangoFontInfo {
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43 public:
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44 enum FontTypeEnum {
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45 UNKNOWN,
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46 SERIF,
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47 SANS_SERIF,
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48 DECORATIVE,
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49 };
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50 PangoFontInfo();
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51 ~PangoFontInfo();
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52 // Initialize from parsing a font description name, defined as a string of the
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53 // format:
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54 // "FamilyName [FaceName] [PointSize]"
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55 // where a missing FaceName implies the default regular face.
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56 // eg. "Arial Italic 12", "Verdana"
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57 //
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58 // FaceName is a combination of:
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59 // [StyleName] [Variant] [Weight] [Stretch]
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60 // with (all optional) Pango-defined values of:
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61 // StyleName: Oblique, Italic
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62 // Variant : Small-Caps
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63 // Weight : Ultra-Light, Light, Medium, Semi-Bold, Bold, Ultra-Bold, Heavy
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64 // Stretch : Ultra-Condensed, Extra-Condensed, Condensed, Semi-Condensed,
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65 // Semi-Expanded, Expanded, Extra-Expanded, Ultra-Expanded.
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66 explicit PangoFontInfo(const std::string &name);
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67 bool ParseFontDescriptionName(const std::string &name);
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68
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69 // Returns true if the font have codepoint coverage for the specified text.
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70 bool CoversUTF8Text(const char *utf8_text, int byte_length) const;
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71 // Modifies string to remove unicode points that are not covered by the
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72 // font. Returns the number of characters dropped.
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73 int DropUncoveredChars(std::string *utf8_text) const;
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74
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75 // Returns true if the entire string can be rendered by the font with full
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76 // character coverage and no unknown glyph or dotted-circle glyph
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77 // substitutions on encountering a badly formed unicode sequence.
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78 // If true, returns individual graphemes. Any whitespace characters in the
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79 // original string are also included in the list.
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80 bool CanRenderString(const char *utf8_word, int len, std::vector<std::string> *graphemes) const;
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81 bool CanRenderString(const char *utf8_word, int len) const;
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82
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83 // Retrieves the x_bearing and x_advance for the given utf8 character in the
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84 // font. Returns false if the glyph for the character could not be found in
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85 // the font.
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86 // Ref: http://freetype.sourceforge.net/freetype2/docs/glyphs/glyphs-3.html
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87 bool GetSpacingProperties(const std::string &utf8_char, int *x_bearing, int *x_advance) const;
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88
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89 // If not already initialized, initializes FontConfig by setting its
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90 // environment variable and creating a fonts.conf file that points to the
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91 // FLAGS_fonts_dir and the cache to FLAGS_fontconfig_tmpdir.
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92 static void SoftInitFontConfig();
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93 // Re-initializes font config, whether or not already initialized.
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94 // If already initialized, any existing cache is deleted, just to be sure.
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95 static void HardInitFontConfig(const char *fonts_dir, const char *cache_dir);
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96
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97 // Accessors
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98 std::string DescriptionName() const;
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99 // Font Family name eg. "Arial"
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100 const std::string &family_name() const {
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101 return family_name_;
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102 }
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103 // Size in points (1/72"), rounded to the nearest integer.
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104 int font_size() const {
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105 return font_size_;
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106 }
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107 FontTypeEnum font_type() const {
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108 return font_type_;
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109 }
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110
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111 int resolution() const {
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112 return resolution_;
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113 }
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114 void set_resolution(const int resolution) {
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115 resolution_ = resolution;
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116 }
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117
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118 private:
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119 friend class FontUtils;
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120 void Clear();
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121 bool ParseFontDescription(const PangoFontDescription *desc);
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122 // Returns the PangoFont structure corresponding to the closest available font
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123 // in the font map.
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124 PangoFont *ToPangoFont() const;
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125
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126 // Font properties set automatically from parsing the font description name.
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127 std::string family_name_;
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128 int font_size_;
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129 FontTypeEnum font_type_;
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130 // The Pango description that was used to initialize the instance.
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131 PangoFontDescription *desc_;
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132 // Default output resolution to assume for GetSpacingProperties() and any
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133 // other methods that returns pixel values.
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134 int resolution_;
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135 // Fontconfig operates through an environment variable, so it intrinsically
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136 // cannot be thread-friendly, but you can serialize multiple independent
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137 // font configurations by calling HardInitFontConfig(fonts_dir, cache_dir).
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138 // These hold the last initialized values set by HardInitFontConfig or
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139 // the first call to SoftInitFontConfig.
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140 // Directory to be scanned for font files.
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141 static std::string fonts_dir_;
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142 // Directory to store the cache of font information. (Can be the same as
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143 // fonts_dir_)
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144 static std::string cache_dir_;
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145
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146 private:
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147 PangoFontInfo(const PangoFontInfo &) = delete;
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148 void operator=(const PangoFontInfo &) = delete;
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149 };
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150
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151 // Static utility methods for querying font availability and font-selection
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152 // based on codepoint coverage.
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153 class TESS_PANGO_TRAINING_API FontUtils {
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154 public:
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155 // Returns true if the font of the given description name is available in the
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156 // target directory specified by --fonts_dir
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157 static bool IsAvailableFont(const char *font_desc) {
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158 return IsAvailableFont(font_desc, nullptr);
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159 }
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160 // Returns true if the font of the given description name is available in the
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161 // target directory specified by --fonts_dir. If false is returned, and
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162 // best_match is not nullptr, the closest matching font is returned there.
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163 static bool IsAvailableFont(const char *font_desc, std::string *best_match);
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164 // Outputs description names of available fonts.
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165 static const std::vector<std::string> &ListAvailableFonts();
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166
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167 // Picks font among available fonts that covers and can render the given word,
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168 // and returns the font description name and the decomposition of the word to
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169 // graphemes. Returns false if no suitable font was found.
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170 static bool SelectFont(const char *utf8_word, const int utf8_len, std::string *font_name,
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171 std::vector<std::string> *graphemes);
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172
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173 // Picks font among all_fonts that covers and can render the given word,
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174 // and returns the font description name and the decomposition of the word to
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175 // graphemes. Returns false if no suitable font was found.
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176 static bool SelectFont(const char *utf8_word, const int utf8_len,
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177 const std::vector<std::string> &all_fonts, std::string *font_name,
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178 std::vector<std::string> *graphemes);
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179
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180 // NOTE: The following utilities were written to be backward compatible with
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181 // StringRender.
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182
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183 // BestFonts returns a font name and a bit vector of the characters it
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184 // can render for the fonts that score within some fraction of the best
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185 // font on the characters in the given hash map.
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186 // In the flags vector, each flag is set according to whether the
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187 // corresponding character (in order of iterating ch_map) can be rendered.
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188 // The return string is a list of the acceptable fonts that were used.
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189 static std::string BestFonts(const std::unordered_map<char32, int64_t> &ch_map,
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190 std::vector<std::pair<const char *, std::vector<bool>>> *font_flag);
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191
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192 // FontScore returns the weighted renderability score of the given
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193 // hash map character table in the given font. The unweighted score
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194 // is also returned in raw_score.
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195 // The values in the bool vector ch_flags correspond to whether the
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196 // corresponding character (in order of iterating ch_map) can be rendered.
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197 static int FontScore(const std::unordered_map<char32, int64_t> &ch_map,
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198 const std::string &fontname, int *raw_score, std::vector<bool> *ch_flags);
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199
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200 // PangoFontInfo is reinitialized, so clear the static list of fonts.
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201 static void ReInit();
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202 static void PangoFontTypeInfo();
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203
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204 private:
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205 static std::vector<std::string> available_fonts_; // cache list
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206 };
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207 } // namespace tesseract
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208
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209 #endif // TESSERACT_TRAINING_PANGO_FONT_INFO_H_