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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* autohint.h */ | |
| 4 /* */ | |
| 5 /* High-level `autohint' module-specific interface (specification). */ | |
| 6 /* */ | |
| 7 /* Copyright 1996-2002, 2007, 2009, 2012 by */ | |
| 8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */ | |
| 9 /* */ | |
| 10 /* This file is part of the FreeType project, and may only be used, */ | |
| 11 /* modified, and distributed under the terms of the FreeType project */ | |
| 12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ | |
| 13 /* this file you indicate that you have read the license and */ | |
| 14 /* understand and accept it fully. */ | |
| 15 /* */ | |
| 16 /***************************************************************************/ | |
| 17 | |
| 18 | |
| 19 /*************************************************************************/ | |
| 20 /* */ | |
| 21 /* The auto-hinter is used to load and automatically hint glyphs if a */ | |
| 22 /* format-specific hinter isn't available. */ | |
| 23 /* */ | |
| 24 /*************************************************************************/ | |
| 25 | |
| 26 | |
| 27 #ifndef __AUTOHINT_H__ | |
| 28 #define __AUTOHINT_H__ | |
| 29 | |
| 30 | |
| 31 /*************************************************************************/ | |
| 32 /* */ | |
| 33 /* A small technical note regarding automatic hinting in order to */ | |
| 34 /* clarify this module interface. */ | |
| 35 /* */ | |
| 36 /* An automatic hinter might compute two kinds of data for a given face: */ | |
| 37 /* */ | |
| 38 /* - global hints: Usually some metrics that describe global properties */ | |
| 39 /* of the face. It is computed by scanning more or less */ | |
| 40 /* aggressively the glyphs in the face, and thus can be */ | |
| 41 /* very slow to compute (even if the size of global */ | |
| 42 /* hints is really small). */ | |
| 43 /* */ | |
| 44 /* - glyph hints: These describe some important features of the glyph */ | |
| 45 /* outline, as well as how to align them. They are */ | |
| 46 /* generally much faster to compute than global hints. */ | |
| 47 /* */ | |
| 48 /* The current FreeType auto-hinter does a pretty good job while */ | |
| 49 /* performing fast computations for both global and glyph hints. */ | |
| 50 /* However, we might be interested in introducing more complex and */ | |
| 51 /* powerful algorithms in the future, like the one described in the John */ | |
| 52 /* D. Hobby paper, which unfortunately requires a lot more horsepower. */ | |
| 53 /* */ | |
| 54 /* Because a sufficiently sophisticated font management system would */ | |
| 55 /* typically implement an LRU cache of opened face objects to reduce */ | |
| 56 /* memory usage, it is a good idea to be able to avoid recomputing */ | |
| 57 /* global hints every time the same face is re-opened. */ | |
| 58 /* */ | |
| 59 /* We thus provide the ability to cache global hints outside of the face */ | |
| 60 /* object, in order to speed up font re-opening time. Of course, this */ | |
| 61 /* feature is purely optional, so most client programs won't even notice */ | |
| 62 /* it. */ | |
| 63 /* */ | |
| 64 /* I initially thought that it would be a good idea to cache the glyph */ | |
| 65 /* hints too. However, my general idea now is that if you really need */ | |
| 66 /* to cache these too, you are simply in need of a new font format, */ | |
| 67 /* where all this information could be stored within the font file and */ | |
| 68 /* decoded on the fly. */ | |
| 69 /* */ | |
| 70 /*************************************************************************/ | |
| 71 | |
| 72 | |
| 73 #include <ft2build.h> | |
| 74 #include FT_FREETYPE_H | |
| 75 | |
| 76 | |
| 77 FT_BEGIN_HEADER | |
| 78 | |
| 79 | |
| 80 typedef struct FT_AutoHinterRec_ *FT_AutoHinter; | |
| 81 | |
| 82 | |
| 83 /*************************************************************************/ | |
| 84 /* */ | |
| 85 /* <FuncType> */ | |
| 86 /* FT_AutoHinter_GlobalGetFunc */ | |
| 87 /* */ | |
| 88 /* <Description> */ | |
| 89 /* Retrieve the global hints computed for a given face object. The */ | |
| 90 /* resulting data is dissociated from the face and will survive a */ | |
| 91 /* call to FT_Done_Face(). It must be discarded through the API */ | |
| 92 /* FT_AutoHinter_GlobalDoneFunc(). */ | |
| 93 /* */ | |
| 94 /* <Input> */ | |
| 95 /* hinter :: A handle to the source auto-hinter. */ | |
| 96 /* */ | |
| 97 /* face :: A handle to the source face object. */ | |
| 98 /* */ | |
| 99 /* <Output> */ | |
| 100 /* global_hints :: A typeless pointer to the global hints. */ | |
| 101 /* */ | |
| 102 /* global_len :: The size in bytes of the global hints. */ | |
| 103 /* */ | |
| 104 typedef void | |
| 105 (*FT_AutoHinter_GlobalGetFunc)( FT_AutoHinter hinter, | |
| 106 FT_Face face, | |
| 107 void** global_hints, | |
| 108 long* global_len ); | |
| 109 | |
| 110 | |
| 111 /*************************************************************************/ | |
| 112 /* */ | |
| 113 /* <FuncType> */ | |
| 114 /* FT_AutoHinter_GlobalDoneFunc */ | |
| 115 /* */ | |
| 116 /* <Description> */ | |
| 117 /* Discard the global hints retrieved through */ | |
| 118 /* FT_AutoHinter_GlobalGetFunc(). This is the only way these hints */ | |
| 119 /* are freed from memory. */ | |
| 120 /* */ | |
| 121 /* <Input> */ | |
| 122 /* hinter :: A handle to the auto-hinter module. */ | |
| 123 /* */ | |
| 124 /* global :: A pointer to retrieved global hints to discard. */ | |
| 125 /* */ | |
| 126 typedef void | |
| 127 (*FT_AutoHinter_GlobalDoneFunc)( FT_AutoHinter hinter, | |
| 128 void* global ); | |
| 129 | |
| 130 | |
| 131 /*************************************************************************/ | |
| 132 /* */ | |
| 133 /* <FuncType> */ | |
| 134 /* FT_AutoHinter_GlobalResetFunc */ | |
| 135 /* */ | |
| 136 /* <Description> */ | |
| 137 /* This function is used to recompute the global metrics in a given */ | |
| 138 /* font. This is useful when global font data changes (e.g. Multiple */ | |
| 139 /* Masters fonts where blend coordinates change). */ | |
| 140 /* */ | |
| 141 /* <Input> */ | |
| 142 /* hinter :: A handle to the source auto-hinter. */ | |
| 143 /* */ | |
| 144 /* face :: A handle to the face. */ | |
| 145 /* */ | |
| 146 typedef void | |
| 147 (*FT_AutoHinter_GlobalResetFunc)( FT_AutoHinter hinter, | |
| 148 FT_Face face ); | |
| 149 | |
| 150 | |
| 151 /*************************************************************************/ | |
| 152 /* */ | |
| 153 /* <FuncType> */ | |
| 154 /* FT_AutoHinter_GlyphLoadFunc */ | |
| 155 /* */ | |
| 156 /* <Description> */ | |
| 157 /* This function is used to load, scale, and automatically hint a */ | |
| 158 /* glyph from a given face. */ | |
| 159 /* */ | |
| 160 /* <Input> */ | |
| 161 /* face :: A handle to the face. */ | |
| 162 /* */ | |
| 163 /* glyph_index :: The glyph index. */ | |
| 164 /* */ | |
| 165 /* load_flags :: The load flags. */ | |
| 166 /* */ | |
| 167 /* <Note> */ | |
| 168 /* This function is capable of loading composite glyphs by hinting */ | |
| 169 /* each sub-glyph independently (which improves quality). */ | |
| 170 /* */ | |
| 171 /* It will call the font driver with @FT_Load_Glyph, with */ | |
| 172 /* @FT_LOAD_NO_SCALE set. */ | |
| 173 /* */ | |
| 174 typedef FT_Error | |
| 175 (*FT_AutoHinter_GlyphLoadFunc)( FT_AutoHinter hinter, | |
| 176 FT_GlyphSlot slot, | |
| 177 FT_Size size, | |
| 178 FT_UInt glyph_index, | |
| 179 FT_Int32 load_flags ); | |
| 180 | |
| 181 | |
| 182 /*************************************************************************/ | |
| 183 /* */ | |
| 184 /* <Struct> */ | |
| 185 /* FT_AutoHinter_InterfaceRec */ | |
| 186 /* */ | |
| 187 /* <Description> */ | |
| 188 /* The auto-hinter module's interface. */ | |
| 189 /* */ | |
| 190 typedef struct FT_AutoHinter_InterfaceRec_ | |
| 191 { | |
| 192 FT_AutoHinter_GlobalResetFunc reset_face; | |
| 193 FT_AutoHinter_GlobalGetFunc get_global_hints; | |
| 194 FT_AutoHinter_GlobalDoneFunc done_global_hints; | |
| 195 FT_AutoHinter_GlyphLoadFunc load_glyph; | |
| 196 | |
| 197 } FT_AutoHinter_InterfaceRec, *FT_AutoHinter_Interface; | |
| 198 | |
| 199 | |
| 200 #ifndef FT_CONFIG_OPTION_PIC | |
| 201 | |
| 202 #define FT_DEFINE_AUTOHINTER_INTERFACE( \ | |
| 203 class_, \ | |
| 204 reset_face_, \ | |
| 205 get_global_hints_, \ | |
| 206 done_global_hints_, \ | |
| 207 load_glyph_ ) \ | |
| 208 FT_CALLBACK_TABLE_DEF \ | |
| 209 const FT_AutoHinter_InterfaceRec class_ = \ | |
| 210 { \ | |
| 211 reset_face_, \ | |
| 212 get_global_hints_, \ | |
| 213 done_global_hints_, \ | |
| 214 load_glyph_ \ | |
| 215 }; | |
| 216 | |
| 217 #else /* FT_CONFIG_OPTION_PIC */ | |
| 218 | |
| 219 #define FT_DEFINE_AUTOHINTER_INTERFACE( \ | |
| 220 class_, \ | |
| 221 reset_face_, \ | |
| 222 get_global_hints_, \ | |
| 223 done_global_hints_, \ | |
| 224 load_glyph_ ) \ | |
| 225 void \ | |
| 226 FT_Init_Class_ ## class_( FT_Library library, \ | |
| 227 FT_AutoHinter_InterfaceRec* clazz ) \ | |
| 228 { \ | |
| 229 FT_UNUSED( library ); \ | |
| 230 \ | |
| 231 clazz->reset_face = reset_face_; \ | |
| 232 clazz->get_global_hints = get_global_hints_; \ | |
| 233 clazz->done_global_hints = done_global_hints_; \ | |
| 234 clazz->load_glyph = load_glyph_; \ | |
| 235 } | |
| 236 | |
| 237 #endif /* FT_CONFIG_OPTION_PIC */ | |
| 238 | |
| 239 FT_END_HEADER | |
| 240 | |
| 241 #endif /* __AUTOHINT_H__ */ | |
| 242 | |
| 243 | |
| 244 /* END */ | |
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Chromium Code Reviews
Issue 1413673003:
Update bundled freetype to 2.6.1 (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@master