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| 1 /***************************************************************************/ | |
| 2 /* */ | |
| 3 /* ftautoh.h */ | |
| 4 /* */ | |
| 5 /* FreeType API for controlling the auto-hinter (specification only). */ | |
| 6 /* */ | |
| 7 /* Copyright 2012, 2013 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 #ifndef __FTAUTOH_H__ | |
| 20 #define __FTAUTOH_H__ | |
| 21 | |
| 22 #include <ft2build.h> | |
| 23 #include FT_FREETYPE_H | |
| 24 | |
| 25 #ifdef FREETYPE_H | |
| 26 #error "freetype.h of FreeType 1 has been loaded!" | |
| 27 #error "Please fix the directory search order for header files" | |
| 28 #error "so that freetype.h of FreeType 2 is found first." | |
| 29 #endif | |
| 30 | |
| 31 | |
| 32 FT_BEGIN_HEADER | |
| 33 | |
| 34 | |
| 35 /************************************************************************** | |
| 36 * | |
| 37 * @section: | |
| 38 * auto_hinter | |
| 39 * | |
| 40 * @title: | |
| 41 * The auto-hinter | |
| 42 * | |
| 43 * @abstract: | |
| 44 * Controlling the auto-hinting module. | |
| 45 * | |
| 46 * @description: | |
| 47 * While FreeType's auto-hinter doesn't expose API functions by itself, | |
| 48 * it is possible to control its behaviour with @FT_Property_Set and | |
| 49 * @FT_Property_Get. The following lists the available properties | |
| 50 * together with the necessary macros and structures. | |
| 51 * | |
| 52 * Note that the auto-hinter's module name is `autofitter' for | |
| 53 * historical reasons. | |
| 54 * | |
| 55 */ | |
| 56 | |
| 57 | |
| 58 /************************************************************************** | |
| 59 * | |
| 60 * @property: | |
| 61 * glyph-to-script-map | |
| 62 * | |
| 63 * @description: | |
| 64 * *Experimental* *only* | |
| 65 * | |
| 66 * The auto-hinter provides various script modules to hint glyphs. | |
| 67 * Examples of supported scripts are Latin or CJK. Before a glyph is | |
| 68 * auto-hinted, the Unicode character map of the font gets examined, and | |
| 69 * the script is then determined based on Unicode character ranges, see | |
| 70 * below. | |
| 71 * | |
| 72 * OpenType fonts, however, often provide much more glyphs than | |
| 73 * character codes (small caps, superscripts, ligatures, swashes, etc.), | |
| 74 * to be controlled by so-called `features'. Handling OpenType features | |
| 75 * can be quite complicated and thus needs a separate library on top of | |
| 76 * FreeType. | |
| 77 * | |
| 78 * The mapping between glyph indices and scripts (in the auto-hinter | |
| 79 * sense, see the @FT_AUTOHINTER_SCRIPT_XXX values) is stored as an | |
| 80 * array with `num_glyphs' elements, as found in the font's @FT_Face | |
| 81 * structure. The `glyph-to-script-map' property returns a pointer to | |
| 82 * this array, which can be modified as needed. Note that the | |
| 83 * modification should happen before the first glyph gets processed by | |
| 84 * the auto-hinter so that the global analysis of the font shapes | |
| 85 * actually uses the modified mapping. | |
| 86 * | |
| 87 * The following example code demonstrates how to access it (omitting | |
| 88 * the error handling). | |
| 89 * | |
| 90 * { | |
| 91 * FT_Library library; | |
| 92 * FT_Face face; | |
| 93 * FT_Prop_GlyphToScriptMap prop; | |
| 94 * | |
| 95 * | |
| 96 * FT_Init_FreeType( &library ); | |
| 97 * FT_New_Face( library, "foo.ttf", 0, &face ); | |
| 98 * | |
| 99 * prop.face = face; | |
| 100 * | |
| 101 * FT_Property_Get( library, "autofitter", | |
| 102 * "glyph-to-script-map", &prop ); | |
| 103 * | |
| 104 * // adjust `prop.map' as needed right here | |
| 105 * | |
| 106 * FT_Load_Glyph( face, ..., FT_LOAD_FORCE_AUTOHINT ); | |
| 107 * } | |
| 108 * | |
| 109 */ | |
| 110 | |
| 111 | |
| 112 /************************************************************************** | |
| 113 * | |
| 114 * @enum: | |
| 115 * FT_AUTOHINTER_SCRIPT_XXX | |
| 116 * | |
| 117 * @description: | |
| 118 * *Experimental* *only* | |
| 119 * | |
| 120 * A list of constants used for the @glyph-to-script-map property to | |
| 121 * specify the script submodule the auto-hinter should use for hinting a | |
| 122 * particular glyph. | |
| 123 * | |
| 124 * @values: | |
| 125 * FT_AUTOHINTER_SCRIPT_NONE :: | |
| 126 * Don't auto-hint this glyph. | |
| 127 * | |
| 128 * FT_AUTOHINTER_SCRIPT_LATIN :: | |
| 129 * Apply the latin auto-hinter. For the auto-hinter, `latin' is a | |
| 130 * very broad term, including Cyrillic and Greek also since characters | |
| 131 * from those scripts share the same design constraints. | |
| 132 * | |
| 133 * By default, characters from the following Unicode ranges are | |
| 134 * assigned to this submodule. | |
| 135 * | |
| 136 * { | |
| 137 * U+0020 - U+007F // Basic Latin (no control characters) | |
| 138 * U+00A0 - U+00FF // Latin-1 Supplement (no control characters) | |
| 139 * U+0100 - U+017F // Latin Extended-A | |
| 140 * U+0180 - U+024F // Latin Extended-B | |
| 141 * U+0250 - U+02AF // IPA Extensions | |
| 142 * U+02B0 - U+02FF // Spacing Modifier Letters | |
| 143 * U+0300 - U+036F // Combining Diacritical Marks | |
| 144 * U+0370 - U+03FF // Greek and Coptic | |
| 145 * U+0400 - U+04FF // Cyrillic | |
| 146 * U+0500 - U+052F // Cyrillic Supplement | |
| 147 * U+1D00 - U+1D7F // Phonetic Extensions | |
| 148 * U+1D80 - U+1DBF // Phonetic Extensions Supplement | |
| 149 * U+1DC0 - U+1DFF // Combining Diacritical Marks Supplement | |
| 150 * U+1E00 - U+1EFF // Latin Extended Additional | |
| 151 * U+1F00 - U+1FFF // Greek Extended | |
| 152 * U+2000 - U+206F // General Punctuation | |
| 153 * U+2070 - U+209F // Superscripts and Subscripts | |
| 154 * U+20A0 - U+20CF // Currency Symbols | |
| 155 * U+2150 - U+218F // Number Forms | |
| 156 * U+2460 - U+24FF // Enclosed Alphanumerics | |
| 157 * U+2C60 - U+2C7F // Latin Extended-C | |
| 158 * U+2DE0 - U+2DFF // Cyrillic Extended-A | |
| 159 * U+2E00 - U+2E7F // Supplemental Punctuation | |
| 160 * U+A640 - U+A69F // Cyrillic Extended-B | |
| 161 * U+A720 - U+A7FF // Latin Extended-D | |
| 162 * U+FB00 - U+FB06 // Alphab. Present. Forms (Latin Ligatures) | |
| 163 * U+1D400 - U+1D7FF // Mathematical Alphanumeric Symbols | |
| 164 * U+1F100 - U+1F1FF // Enclosed Alphanumeric Supplement | |
| 165 * } | |
| 166 * | |
| 167 * FT_AUTOHINTER_SCRIPT_CJK :: | |
| 168 * Apply the CJK auto-hinter, covering Chinese, Japanese, Korean, old | |
| 169 * Vietnamese, and some other scripts. | |
| 170 * | |
| 171 * By default, characters from the following Unicode ranges are | |
| 172 * assigned to this submodule. | |
| 173 * | |
| 174 * { | |
| 175 * U+1100 - U+11FF // Hangul Jamo | |
| 176 * U+2E80 - U+2EFF // CJK Radicals Supplement | |
| 177 * U+2F00 - U+2FDF // Kangxi Radicals | |
| 178 * U+2FF0 - U+2FFF // Ideographic Description Characters | |
| 179 * U+3000 - U+303F // CJK Symbols and Punctuation | |
| 180 * U+3040 - U+309F // Hiragana | |
| 181 * U+30A0 - U+30FF // Katakana | |
| 182 * U+3100 - U+312F // Bopomofo | |
| 183 * U+3130 - U+318F // Hangul Compatibility Jamo | |
| 184 * U+3190 - U+319F // Kanbun | |
| 185 * U+31A0 - U+31BF // Bopomofo Extended | |
| 186 * U+31C0 - U+31EF // CJK Strokes | |
| 187 * U+31F0 - U+31FF // Katakana Phonetic Extensions | |
| 188 * U+3200 - U+32FF // Enclosed CJK Letters and Months | |
| 189 * U+3300 - U+33FF // CJK Compatibility | |
| 190 * U+3400 - U+4DBF // CJK Unified Ideographs Extension A | |
| 191 * U+4DC0 - U+4DFF // Yijing Hexagram Symbols | |
| 192 * U+4E00 - U+9FFF // CJK Unified Ideographs | |
| 193 * U+A960 - U+A97F // Hangul Jamo Extended-A | |
| 194 * U+AC00 - U+D7AF // Hangul Syllables | |
| 195 * U+D7B0 - U+D7FF // Hangul Jamo Extended-B | |
| 196 * U+F900 - U+FAFF // CJK Compatibility Ideographs | |
| 197 * U+FE10 - U+FE1F // Vertical forms | |
| 198 * U+FE30 - U+FE4F // CJK Compatibility Forms | |
| 199 * U+FF00 - U+FFEF // Halfwidth and Fullwidth Forms | |
| 200 * U+1B000 - U+1B0FF // Kana Supplement | |
| 201 * U+1D300 - U+1D35F // Tai Xuan Hing Symbols | |
| 202 * U+1F200 - U+1F2FF // Enclosed Ideographic Supplement | |
| 203 * U+20000 - U+2A6DF // CJK Unified Ideographs Extension B | |
| 204 * U+2A700 - U+2B73F // CJK Unified Ideographs Extension C | |
| 205 * U+2B740 - U+2B81F // CJK Unified Ideographs Extension D | |
| 206 * U+2F800 - U+2FA1F // CJK Compatibility Ideographs Supplement | |
| 207 * } | |
| 208 * | |
| 209 * FT_AUTOHINTER_SCRIPT_INDIC :: | |
| 210 * Apply the indic auto-hinter, covering all major scripts from the | |
| 211 * Indian sub-continent and some other related scripts like Thai, Lao, | |
| 212 * or Tibetan. | |
| 213 * | |
| 214 * By default, characters from the following Unicode ranges are | |
| 215 * assigned to this submodule. | |
| 216 * | |
| 217 * { | |
| 218 * U+0900 - U+0DFF // Indic Range | |
| 219 * U+0F00 - U+0FFF // Tibetan | |
| 220 * U+1900 - U+194F // Limbu | |
| 221 * U+1B80 - U+1BBF // Sundanese | |
| 222 * U+1C80 - U+1CDF // Meetei Mayak | |
| 223 * U+A800 - U+A82F // Syloti Nagri | |
| 224 * U+11800 - U+118DF // Sharada | |
| 225 * } | |
| 226 * | |
| 227 * Note that currently Indic support is rudimentary only, missing blue | |
| 228 * zone support. | |
| 229 * | |
| 230 */ | |
| 231 #define FT_AUTOHINTER_SCRIPT_NONE 0 | |
| 232 #define FT_AUTOHINTER_SCRIPT_LATIN 1 | |
| 233 #define FT_AUTOHINTER_SCRIPT_CJK 2 | |
| 234 #define FT_AUTOHINTER_SCRIPT_INDIC 3 | |
| 235 | |
| 236 | |
| 237 /************************************************************************** | |
| 238 * | |
| 239 * @struct: | |
| 240 * FT_Prop_GlyphToScriptMap | |
| 241 * | |
| 242 * @description: | |
| 243 * *Experimental* *only* | |
| 244 * | |
| 245 * The data exchange structure for the @glyph-to-script-map property. | |
| 246 * | |
| 247 */ | |
| 248 typedef struct FT_Prop_GlyphToScriptMap_ | |
| 249 { | |
| 250 FT_Face face; | |
| 251 FT_Byte* map; | |
| 252 | |
| 253 } FT_Prop_GlyphToScriptMap; | |
| 254 | |
| 255 | |
| 256 /************************************************************************** | |
| 257 * | |
| 258 * @property: | |
| 259 * fallback-script | |
| 260 * | |
| 261 * @description: | |
| 262 * *Experimental* *only* | |
| 263 * | |
| 264 * If no auto-hinter script module can be assigned to a glyph, a | |
| 265 * fallback script gets assigned to it (see also the | |
| 266 * @glyph-to-script-map property). By default, this is | |
| 267 * @FT_AUTOHINTER_SCRIPT_CJK. Using the `fallback-script' property, | |
| 268 * this fallback value can be changed. | |
| 269 * | |
| 270 * { | |
| 271 * FT_Library library; | |
| 272 * FT_UInt fallback_script = FT_AUTOHINTER_SCRIPT_NONE; | |
| 273 * | |
| 274 * | |
| 275 * FT_Init_FreeType( &library ); | |
| 276 * | |
| 277 * FT_Property_Set( library, "autofitter", | |
| 278 * "fallback-script", &fallback_script ); | |
| 279 * } | |
| 280 * | |
| 281 * @note: | |
| 282 * This property can be used with @FT_Property_Get also. | |
| 283 * | |
| 284 * It's important to use the right timing for changing this value: The | |
| 285 * creation of the glyph-to-script map that eventually uses the | |
| 286 * fallback script value gets triggered either by setting or reading a | |
| 287 * face-specific property like @glyph-to-script-map, or by auto-hinting | |
| 288 * any glyph from that face. In particular, if you have already created | |
| 289 * an @FT_Face structure but not loaded any glyph (using the | |
| 290 * auto-hinter), a change of the fallback script will affect this face. | |
| 291 * | |
| 292 */ | |
| 293 | |
| 294 | |
| 295 /************************************************************************** | |
| 296 * | |
| 297 * @property: | |
| 298 * default-script | |
| 299 * | |
| 300 * @description: | |
| 301 * *Experimental* *only* | |
| 302 * | |
| 303 * If Freetype gets compiled with FT_CONFIG_OPTION_USE_HARFBUZZ to make | |
| 304 * the HarfBuzz library access OpenType features for getting better | |
| 305 * glyph coverages, this property sets the (auto-fitter) script to be | |
| 306 * used for the default (OpenType) script data of a font's GSUB table. | |
| 307 * Features for the default script are intended for all scripts not | |
| 308 * explicitly handled in GSUB; an example is a `dlig' feature, | |
| 309 * containing the combination of the characters `T', `E', and `L' to | |
| 310 * form a `TEL' ligature. | |
| 311 * | |
| 312 * By default, this is @FT_AUTOHINTER_SCRIPT_LATIN. Using the | |
| 313 * `default-script' property, this default value can be changed. | |
| 314 * | |
| 315 * { | |
| 316 * FT_Library library; | |
| 317 * FT_UInt default_script = FT_AUTOHINTER_SCRIPT_NONE; | |
| 318 * | |
| 319 * | |
| 320 * FT_Init_FreeType( &library ); | |
| 321 * | |
| 322 * FT_Property_Set( library, "autofitter", | |
| 323 * "default-script", &default_script ); | |
| 324 * } | |
| 325 * | |
| 326 * @note: | |
| 327 * This property can be used with @FT_Property_Get also. | |
| 328 * | |
| 329 * It's important to use the right timing for changing this value: The | |
| 330 * creation of the glyph-to-script map that eventually uses the | |
| 331 * default script value gets triggered either by setting or reading a | |
| 332 * face-specific property like @glyph-to-script-map, or by auto-hinting | |
| 333 * any glyph from that face. In particular, if you have already created | |
| 334 * an @FT_Face structure but not loaded any glyph (using the | |
| 335 * auto-hinter), a change of the default script will affect this face. | |
| 336 * | |
| 337 */ | |
| 338 | |
| 339 | |
| 340 /************************************************************************** | |
| 341 * | |
| 342 * @property: | |
| 343 * increase-x-height | |
| 344 * | |
| 345 * @description: | |
| 346 * For ppem values in the range 6~<= ppem <= `increase-x-height', round | |
| 347 * up the font's x~height much more often than normally. If the value | |
| 348 * is set to~0, which is the default, this feature is switched off. Use | |
| 349 * this property to improve the legibility of small font sizes if | |
| 350 * necessary. | |
| 351 * | |
| 352 * { | |
| 353 * FT_Library library; | |
| 354 * FT_Face face; | |
| 355 * FT_Prop_IncreaseXHeight prop; | |
| 356 * | |
| 357 * | |
| 358 * FT_Init_FreeType( &library ); | |
| 359 * FT_New_Face( library, "foo.ttf", 0, &face ); | |
| 360 * FT_Set_Char_Size( face, 10 * 64, 0, 72, 0 ); | |
| 361 * | |
| 362 * prop.face = face; | |
| 363 * prop.limit = 14; | |
| 364 * | |
| 365 * FT_Property_Set( library, "autofitter", | |
| 366 * "increase-x-height", &prop ); | |
| 367 * } | |
| 368 * | |
| 369 * @note: | |
| 370 * This property can be used with @FT_Property_Get also. | |
| 371 * | |
| 372 * Set this value right after calling @FT_Set_Char_Size, but before | |
| 373 * loading any glyph (using the auto-hinter). | |
| 374 * | |
| 375 */ | |
| 376 | |
| 377 | |
| 378 /************************************************************************** | |
| 379 * | |
| 380 * @struct: | |
| 381 * FT_Prop_IncreaseXHeight | |
| 382 * | |
| 383 * @description: | |
| 384 * The data exchange structure for the @increase-x-height property. | |
| 385 * | |
| 386 */ | |
| 387 typedef struct FT_Prop_IncreaseXHeight_ | |
| 388 { | |
| 389 FT_Face face; | |
| 390 FT_UInt limit; | |
| 391 | |
| 392 } FT_Prop_IncreaseXHeight; | |
| 393 | |
| 394 /* */ | |
| 395 | |
| 396 | |
| 397 FT_END_HEADER | |
| 398 | |
| 399 #endif /* __FTAUTOH_H__ */ | |
| 400 | |
| 401 | |
| 402 /* END */ | |
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Chromium Code Reviews
Issue 1416993005:
Merge to XFA: Update bundled freetype to 2.6.1 (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@xfa