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