1 /***************************************************************************/ 2 /* */ 3 /* aftypes.h */ 4 /* */ 5 /* Auto-fitter types (specification only). */ 6 /* */ 7 /* Copyright 2003-2009, 2011-2012 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-fitter is a complete rewrite of the old auto-hinter. 22 * Its main feature is the ability to differentiate between different 23 * scripts in order to apply language-specific rules. 24 * 25 * The code has also been compartmentized into several entities that 26 * should make algorithmic experimentation easier than with the old 27 * code. 28 * 29 * Finally, we get rid of the Catharon license, since this code is 30 * released under the FreeType one. 31 * 32 *************************************************************************/ 33 34 35 #ifndef __AFTYPES_H__ 36 #define __AFTYPES_H__ 37 38 #include <ft2build.h> 39 40 #include FT_FREETYPE_H 41 #include FT_OUTLINE_H 42 #include FT_INTERNAL_OBJECTS_H 43 #include FT_INTERNAL_DEBUG_H 44 45 46 FT_BEGIN_HEADER 47 48 /*************************************************************************/ 49 /*************************************************************************/ 50 /***** *****/ 51 /***** D E B U G G I N G *****/ 52 /***** *****/ 53 /*************************************************************************/ 54 /*************************************************************************/ 55 56 #ifdef FT_DEBUG_AUTOFIT 57 58 #include FT_CONFIG_STANDARD_LIBRARY_H 59 60 extern int _af_debug_disable_horz_hints; 61 extern int _af_debug_disable_vert_hints; 62 extern int _af_debug_disable_blue_hints; 63 extern void* _af_debug_hints; 64 65 #endif /* FT_DEBUG_AUTOFIT */ 66 67 68 /*************************************************************************/ 69 /*************************************************************************/ 70 /***** *****/ 71 /***** U T I L I T Y S T U F F *****/ 72 /***** *****/ 73 /*************************************************************************/ 74 /*************************************************************************/ 75 76 typedef struct AF_WidthRec_ 77 { 78 FT_Pos org; /* original position/width in font units */ 79 FT_Pos cur; /* current/scaled position/width in device sub-pixels */ 80 FT_Pos fit; /* current/fitted position/width in device sub-pixels */ 81 82 } AF_WidthRec, *AF_Width; 83 84 85 FT_LOCAL( void ) 86 af_sort_pos( FT_UInt count, 87 FT_Pos* table ); 88 89 FT_LOCAL( void ) 90 af_sort_and_quantize_widths( FT_UInt* count, 91 AF_Width widths, 92 FT_Pos threshold ); 93 94 95 /*************************************************************************/ 96 /*************************************************************************/ 97 /***** *****/ 98 /***** A N G L E T Y P E S *****/ 99 /***** *****/ 100 /*************************************************************************/ 101 /*************************************************************************/ 102 103 /* 104 * The auto-fitter doesn't need a very high angular accuracy; 105 * this allows us to speed up some computations considerably with a 106 * light Cordic algorithm (see afangles.c). 107 */ 108 109 typedef FT_Int AF_Angle; 110 111 112 #define AF_ANGLE_PI 256 113 #define AF_ANGLE_2PI ( AF_ANGLE_PI * 2 ) 114 #define AF_ANGLE_PI2 ( AF_ANGLE_PI / 2 ) 115 #define AF_ANGLE_PI4 ( AF_ANGLE_PI / 4 ) 116 117 118 #if 0 119 /* 120 * compute the angle of a given 2-D vector 121 */ 122 FT_LOCAL( AF_Angle ) 123 af_angle_atan( FT_Pos dx, 124 FT_Pos dy ); 125 126 127 /* 128 * compute `angle2 - angle1'; the result is always within 129 * the range [-AF_ANGLE_PI .. AF_ANGLE_PI - 1] 130 */ 131 FT_LOCAL( AF_Angle ) 132 af_angle_diff( AF_Angle angle1, 133 AF_Angle angle2 ); 134 #endif /* 0 */ 135 136 137 #define AF_ANGLE_DIFF( result, angle1, angle2 ) \ 138 FT_BEGIN_STMNT \ 139 AF_Angle _delta = (angle2) - (angle1); \ 140 \ 141 \ 142 _delta %= AF_ANGLE_2PI; \ 143 if ( _delta < 0 ) \ 144 _delta += AF_ANGLE_2PI; \ 145 \ 146 if ( _delta > AF_ANGLE_PI ) \ 147 _delta -= AF_ANGLE_2PI; \ 148 \ 149 result = _delta; \ 150 FT_END_STMNT 151 152 153 /* opaque handle to glyph-specific hints -- see `afhints.h' for more 154 * details 155 */ 156 typedef struct AF_GlyphHintsRec_* AF_GlyphHints; 157 158 159 /*************************************************************************/ 160 /*************************************************************************/ 161 /***** *****/ 162 /***** S C A L E R S *****/ 163 /***** *****/ 164 /*************************************************************************/ 165 /*************************************************************************/ 166 167 /* 168 * A scaler models the target pixel device that will receive the 169 * auto-hinted glyph image. 170 */ 171 172 typedef enum AF_ScalerFlags_ 173 { 174 AF_SCALER_FLAG_NO_HORIZONTAL = 1, /* disable horizontal hinting */ 175 AF_SCALER_FLAG_NO_VERTICAL = 2, /* disable vertical hinting */ 176 AF_SCALER_FLAG_NO_ADVANCE = 4 /* disable advance hinting */ 177 178 } AF_ScalerFlags; 179 180 181 typedef struct AF_ScalerRec_ 182 { 183 FT_Face face; /* source font face */ 184 FT_Fixed x_scale; /* from font units to 1/64th device pixels */ 185 FT_Fixed y_scale; /* from font units to 1/64th device pixels */ 186 FT_Pos x_delta; /* in 1/64th device pixels */ 187 FT_Pos y_delta; /* in 1/64th device pixels */ 188 FT_Render_Mode render_mode; /* monochrome, anti-aliased, LCD, etc. */ 189 FT_UInt32 flags; /* additional control flags, see above */ 190 191 } AF_ScalerRec, *AF_Scaler; 192 193 194 #define AF_SCALER_EQUAL_SCALES( a, b ) \ 195 ( (a)->x_scale == (b)->x_scale && \ 196 (a)->y_scale == (b)->y_scale && \ 197 (a)->x_delta == (b)->x_delta && \ 198 (a)->y_delta == (b)->y_delta ) 199 200 201 /*************************************************************************/ 202 /*************************************************************************/ 203 /***** *****/ 204 /***** S C R I P T S *****/ 205 /***** *****/ 206 /*************************************************************************/ 207 /*************************************************************************/ 208 209 /* 210 * The list of known scripts. Each different script corresponds to the 211 * following information: 212 * 213 * - A set of Unicode ranges to test whether the face supports the 214 * script. 215 * 216 * - A specific global analyzer that will compute global metrics 217 * specific to the script. 218 * 219 * - A specific glyph analyzer that will compute segments and 220 * edges for each glyph covered by the script. 221 * 222 * - A specific grid-fitting algorithm that will distort the 223 * scaled glyph outline according to the results of the glyph 224 * analyzer. 225 * 226 * Note that a given analyzer and/or grid-fitting algorithm can be 227 * used by more than one script. 228 */ 229 230 typedef enum AF_Script_ 231 { 232 AF_SCRIPT_DUMMY = 0, 233 AF_SCRIPT_LATIN = 1, 234 AF_SCRIPT_CJK = 2, 235 AF_SCRIPT_INDIC = 3, 236 #ifdef FT_OPTION_AUTOFIT2 237 AF_SCRIPT_LATIN2 = 4, 238 #endif 239 240 /* add new scripts here. Don't forget to update the list in */ 241 /* `afglobal.c'. */ 242 243 AF_SCRIPT_MAX /* do not remove */ 244 245 } AF_Script; 246 247 248 typedef struct AF_ScriptClassRec_ const* AF_ScriptClass; 249 typedef struct AF_FaceGlobalsRec_* AF_FaceGlobals; 250 251 typedef struct AF_ScriptMetricsRec_ 252 { 253 AF_ScriptClass clazz; 254 AF_ScalerRec scaler; 255 FT_Bool digits_have_same_width; 256 257 AF_FaceGlobals globals; /* to access properties */ 258 259 } AF_ScriptMetricsRec, *AF_ScriptMetrics; 260 261 262 /* This function parses an FT_Face to compute global metrics for 263 * a specific script. 264 */ 265 typedef FT_Error 266 (*AF_Script_InitMetricsFunc)( AF_ScriptMetrics metrics, 267 FT_Face face ); 268 269 typedef void 270 (*AF_Script_ScaleMetricsFunc)( AF_ScriptMetrics metrics, 271 AF_Scaler scaler ); 272 273 typedef void 274 (*AF_Script_DoneMetricsFunc)( AF_ScriptMetrics metrics ); 275 276 277 typedef FT_Error 278 (*AF_Script_InitHintsFunc)( AF_GlyphHints hints, 279 AF_ScriptMetrics metrics ); 280 281 typedef void 282 (*AF_Script_ApplyHintsFunc)( AF_GlyphHints hints, 283 FT_Outline* outline, 284 AF_ScriptMetrics metrics ); 285 286 287 typedef struct AF_Script_UniRangeRec_ 288 { 289 FT_UInt32 first; 290 FT_UInt32 last; 291 292 } AF_Script_UniRangeRec; 293 294 #define AF_UNIRANGE_REC( a, b ) { (FT_UInt32)(a), (FT_UInt32)(b) } 295 296 typedef const AF_Script_UniRangeRec *AF_Script_UniRange; 297 298 299 typedef struct AF_ScriptClassRec_ 300 { 301 AF_Script script; 302 AF_Script_UniRange script_uni_ranges; /* last must be { 0, 0 } */ 303 FT_UInt32 standard_char; /* for default width and height */ 304 305 FT_Offset script_metrics_size; 306 AF_Script_InitMetricsFunc script_metrics_init; 307 AF_Script_ScaleMetricsFunc script_metrics_scale; 308 AF_Script_DoneMetricsFunc script_metrics_done; 309 310 AF_Script_InitHintsFunc script_hints_init; 311 AF_Script_ApplyHintsFunc script_hints_apply; 312 313 } AF_ScriptClassRec; 314 315 316 /* Declare and define vtables for classes */ 317 #ifndef FT_CONFIG_OPTION_PIC 318 319 #define AF_DECLARE_SCRIPT_CLASS( script_class ) \ 320 FT_CALLBACK_TABLE const AF_ScriptClassRec \ 321 script_class; 322 323 #define AF_DEFINE_SCRIPT_CLASS( script_class, script_, ranges, def_char, \ 324 m_size, \ 325 m_init, m_scale, m_done, h_init, h_apply ) \ 326 FT_CALLBACK_TABLE_DEF const AF_ScriptClassRec script_class = \ 327 { \ 328 script_, \ 329 ranges, \ 330 def_char, \ 331 \ 332 m_size, \ 333 \ 334 m_init, \ 335 m_scale, \ 336 m_done, \ 337 \ 338 h_init, \ 339 h_apply \ 340 }; 341 342 #else /* FT_CONFIG_OPTION_PIC */ 343 344 #define AF_DECLARE_SCRIPT_CLASS( script_class ) \ 345 FT_LOCAL( void ) \ 346 FT_Init_Class_ ## script_class( AF_ScriptClassRec* ac ); 347 348 #define AF_DEFINE_SCRIPT_CLASS( script_class, script_, ranges, def_char, \ 349 m_size, \ 350 m_init, m_scale, m_done, h_init, h_apply ) \ 351 FT_LOCAL_DEF( void ) \ 352 FT_Init_Class_ ## script_class( AF_ScriptClassRec* ac ) \ 353 { \ 354 ac->script = script_; \ 355 ac->script_uni_ranges = ranges; \ 356 ac->default_char = def_char; \ 357 \ 358 ac->script_metrics_size = m_size; \ 359 \ 360 ac->script_metrics_init = m_init; \ 361 ac->script_metrics_scale = m_scale; \ 362 ac->script_metrics_done = m_done; \ 363 \ 364 ac->script_hints_init = h_init; \ 365 ac->script_hints_apply = h_apply; \ 366 } 367 368 #endif /* FT_CONFIG_OPTION_PIC */ 369 370 371 /* */ 372 373 FT_END_HEADER 374 375 #endif /* __AFTYPES_H__ */ 376 377 378 /* END */ 379
