/modules/freetype2/src/autofit/afglobal.c
C | 323 lines | 205 code | 73 blank | 45 comment | 42 complexity | a03cdd924b27ced3047fe017b7e5b9f5 MD5 | raw file
1/***************************************************************************/ 2/* */ 3/* afglobal.c */ 4/* */ 5/* Auto-fitter routines to compute global hinting values (body). */ 6/* */ 7/* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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#include "afglobal.h" 20#include "afdummy.h" 21#include "aflatin.h" 22#include "afcjk.h" 23#include "afindic.h" 24#include "afpic.h" 25 26#include "aferrors.h" 27 28#ifdef FT_OPTION_AUTOFIT2 29#include "aflatin2.h" 30#endif 31 32#ifndef FT_CONFIG_OPTION_PIC 33 34/* when updating this table, don't forget to update 35 AF_SCRIPT_CLASSES_COUNT and autofit_module_class_pic_init */ 36 37 /* populate this list when you add new scripts */ 38 static AF_ScriptClass const af_script_classes[] = 39 { 40 &af_dummy_script_class, 41#ifdef FT_OPTION_AUTOFIT2 42 &af_latin2_script_class, 43#endif 44 &af_latin_script_class, 45 &af_cjk_script_class, 46 &af_indic_script_class, 47 NULL /* do not remove */ 48 }; 49 50#endif /* FT_CONFIG_OPTION_PIC */ 51 52 /* index of default script in `af_script_classes' */ 53#define AF_SCRIPT_LIST_DEFAULT 2 54 /* a bit mask indicating an uncovered glyph */ 55#define AF_SCRIPT_LIST_NONE 0x7F 56 /* if this flag is set, we have an ASCII digit */ 57#define AF_DIGIT 0x80 58 59 60 /* 61 * Note that glyph_scripts[] is used to map each glyph into 62 * an index into the `af_script_classes' array. 63 * 64 */ 65 typedef struct AF_FaceGlobalsRec_ 66 { 67 FT_Face face; 68 FT_Long glyph_count; /* same as face->num_glyphs */ 69 FT_Byte* glyph_scripts; 70 71 AF_ScriptMetrics metrics[AF_SCRIPT_MAX]; 72 73 } AF_FaceGlobalsRec; 74 75 76 /* Compute the script index of each glyph within a given face. */ 77 78 static FT_Error 79 af_face_globals_compute_script_coverage( AF_FaceGlobals globals ) 80 { 81 FT_Error error = AF_Err_Ok; 82 FT_Face face = globals->face; 83 FT_CharMap old_charmap = face->charmap; 84 FT_Byte* gscripts = globals->glyph_scripts; 85 FT_UInt ss, i; 86 87 88 /* the value 255 means `uncovered glyph' */ 89 FT_MEM_SET( globals->glyph_scripts, 90 AF_SCRIPT_LIST_NONE, 91 globals->glyph_count ); 92 93 error = FT_Select_Charmap( face, FT_ENCODING_UNICODE ); 94 if ( error ) 95 { 96 /* 97 * Ignore this error; we simply use the default script. 98 * XXX: Shouldn't we rather disable hinting? 99 */ 100 error = AF_Err_Ok; 101 goto Exit; 102 } 103 104 /* scan each script in a Unicode charmap */ 105 for ( ss = 0; AF_SCRIPT_CLASSES_GET[ss]; ss++ ) 106 { 107 AF_ScriptClass clazz = AF_SCRIPT_CLASSES_GET[ss]; 108 AF_Script_UniRange range; 109 110 111 if ( clazz->script_uni_ranges == NULL ) 112 continue; 113 114 /* 115 * Scan all unicode points in the range and set the corresponding 116 * glyph script index. 117 */ 118 for ( range = clazz->script_uni_ranges; range->first != 0; range++ ) 119 { 120 FT_ULong charcode = range->first; 121 FT_UInt gindex; 122 123 124 gindex = FT_Get_Char_Index( face, charcode ); 125 126 if ( gindex != 0 && 127 gindex < (FT_ULong)globals->glyph_count && 128 gscripts[gindex] == AF_SCRIPT_LIST_NONE ) 129 { 130 gscripts[gindex] = (FT_Byte)ss; 131 } 132 133 for (;;) 134 { 135 charcode = FT_Get_Next_Char( face, charcode, &gindex ); 136 137 if ( gindex == 0 || charcode > range->last ) 138 break; 139 140 if ( gindex < (FT_ULong)globals->glyph_count && 141 gscripts[gindex] == AF_SCRIPT_LIST_NONE ) 142 { 143 gscripts[gindex] = (FT_Byte)ss; 144 } 145 } 146 } 147 } 148 149 /* mark ASCII digits */ 150 for ( i = 0x30; i <= 0x39; i++ ) 151 { 152 FT_UInt gindex = FT_Get_Char_Index( face, i ); 153 154 155 if ( gindex != 0 && gindex < (FT_ULong)globals->glyph_count ) 156 gscripts[gindex] |= AF_DIGIT; 157 } 158 159 Exit: 160 /* 161 * By default, all uncovered glyphs are set to the latin script. 162 * XXX: Shouldn't we disable hinting or do something similar? 163 */ 164 { 165 FT_Long nn; 166 167 168 for ( nn = 0; nn < globals->glyph_count; nn++ ) 169 { 170 if ( ( gscripts[nn] & ~AF_DIGIT ) == AF_SCRIPT_LIST_NONE ) 171 { 172 gscripts[nn] &= ~AF_SCRIPT_LIST_NONE; 173 gscripts[nn] |= AF_SCRIPT_LIST_DEFAULT; 174 } 175 } 176 } 177 178 FT_Set_Charmap( face, old_charmap ); 179 return error; 180 } 181 182 183 FT_LOCAL_DEF( FT_Error ) 184 af_face_globals_new( FT_Face face, 185 AF_FaceGlobals *aglobals ) 186 { 187 FT_Error error; 188 FT_Memory memory; 189 AF_FaceGlobals globals = NULL; 190 191 192 memory = face->memory; 193 194 if ( !FT_ALLOC( globals, sizeof ( *globals ) + 195 face->num_glyphs * sizeof ( FT_Byte ) ) ) 196 { 197 globals->face = face; 198 globals->glyph_count = face->num_glyphs; 199 globals->glyph_scripts = (FT_Byte*)( globals + 1 ); 200 201 error = af_face_globals_compute_script_coverage( globals ); 202 if ( error ) 203 { 204 af_face_globals_free( globals ); 205 globals = NULL; 206 } 207 } 208 209 *aglobals = globals; 210 return error; 211 } 212 213 214 FT_LOCAL_DEF( void ) 215 af_face_globals_free( AF_FaceGlobals globals ) 216 { 217 if ( globals ) 218 { 219 FT_Memory memory = globals->face->memory; 220 FT_UInt nn; 221 222 223 for ( nn = 0; nn < AF_SCRIPT_MAX; nn++ ) 224 { 225 if ( globals->metrics[nn] ) 226 { 227 AF_ScriptClass clazz = AF_SCRIPT_CLASSES_GET[nn]; 228 229 230 FT_ASSERT( globals->metrics[nn]->clazz == clazz ); 231 232 if ( clazz->script_metrics_done ) 233 clazz->script_metrics_done( globals->metrics[nn] ); 234 235 FT_FREE( globals->metrics[nn] ); 236 } 237 } 238 239 globals->glyph_count = 0; 240 globals->glyph_scripts = NULL; /* no need to free this one! */ 241 globals->face = NULL; 242 243 FT_FREE( globals ); 244 } 245 } 246 247 248 FT_LOCAL_DEF( FT_Error ) 249 af_face_globals_get_metrics( AF_FaceGlobals globals, 250 FT_UInt gindex, 251 FT_UInt options, 252 AF_ScriptMetrics *ametrics ) 253 { 254 AF_ScriptMetrics metrics = NULL; 255 FT_UInt gidx; 256 AF_ScriptClass clazz; 257 FT_UInt script = options & 15; 258 const FT_Offset script_max = sizeof ( AF_SCRIPT_CLASSES_GET ) / 259 sizeof ( AF_SCRIPT_CLASSES_GET[0] ); 260 FT_Error error = AF_Err_Ok; 261 262 263 if ( gindex >= (FT_ULong)globals->glyph_count ) 264 { 265 error = AF_Err_Invalid_Argument; 266 goto Exit; 267 } 268 269 gidx = script; 270 if ( gidx == 0 || gidx + 1 >= script_max ) 271 gidx = globals->glyph_scripts[gindex] & AF_SCRIPT_LIST_NONE; 272 273 clazz = AF_SCRIPT_CLASSES_GET[gidx]; 274 if ( script == 0 ) 275 script = clazz->script; 276 277 metrics = globals->metrics[clazz->script]; 278 if ( metrics == NULL ) 279 { 280 /* create the global metrics object when needed */ 281 FT_Memory memory = globals->face->memory; 282 283 284 if ( FT_ALLOC( metrics, clazz->script_metrics_size ) ) 285 goto Exit; 286 287 metrics->clazz = clazz; 288 289 if ( clazz->script_metrics_init ) 290 { 291 error = clazz->script_metrics_init( metrics, globals->face ); 292 if ( error ) 293 { 294 if ( clazz->script_metrics_done ) 295 clazz->script_metrics_done( metrics ); 296 297 FT_FREE( metrics ); 298 goto Exit; 299 } 300 } 301 302 globals->metrics[clazz->script] = metrics; 303 } 304 305 Exit: 306 *ametrics = metrics; 307 308 return error; 309 } 310 311 312 FT_LOCAL_DEF( FT_Bool ) 313 af_face_globals_is_digit( AF_FaceGlobals globals, 314 FT_UInt gindex ) 315 { 316 if ( gindex < (FT_ULong)globals->glyph_count ) 317 return (FT_Bool)( globals->glyph_scripts[gindex] & AF_DIGIT ); 318 319 return (FT_Bool)0; 320 } 321 322 323/* END */