src/fclist.c

   1 /*
   2  * $XFree86: xc/lib/fontconfig/src/fclist.c,v 1.2 2002/02/28 16:51:48 keithp Exp $
   3  *
   4  * Copyright © 2000 Keith Packard, member of The XFree86 Project, Inc.
   5  *
   6  * Permission to use, copy, modify, distribute, and sell this software and its
   7  * documentation for any purpose is hereby granted without fee, provided that
   8  * the above copyright notice appear in all copies and that both that
   9  * copyright notice and this permission notice appear in supporting
  10  * documentation, and that the name of Keith Packard not be used in
  11  * advertising or publicity pertaining to distribution of the software without
  12  * specific, written prior permission.  Keith Packard makes no
  13  * representations about the suitability of this software for any purpose.  It
  14  * is provided "as is" without express or implied warranty.
  15  *
  16  * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  18  * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  22  * PERFORMANCE OF THIS SOFTWARE.
  23  */
  24
  25 #include <stdlib.h>
  26 #include "fcint.h"
  27
  28 FcObjectSet *
  29 FcObjectSetCreate (void)
  30 {
  31     FcObjectSet    *os;
  32
  33     os = (FcObjectSet *) malloc (sizeof (FcObjectSet));
  34     if (!os)
  35         return 0;
  36     FcMemAlloc (FC_MEM_OBJECTSET, sizeof (FcObjectSet));
  37     os->nobject = 0;
  38     os->sobject = 0;
  39     os->objects = 0;
  40     return os;
  41 }
  42
  43 FcBool
  44 FcObjectSetAdd (FcObjectSet *os, const char *object)
  45 {
  46     int         s;
  47     const char  **objects;
  48
  49     if (os->nobject == os->sobject)
  50     {
  51         s = os->sobject + 4;
  52         if (os->objects)
  53             objects = (const char **) realloc ((void *) os->objects,
  54                                                s * sizeof (const char *));
  55         else
  56             objects = (const char **) malloc (s * sizeof (const char *));
  57         if (!objects)
  58             return FcFalse;
  59         if (os->sobject)
  60             FcMemFree (FC_MEM_OBJECTPTR, os->sobject * sizeof (const char *));
  61         FcMemAlloc (FC_MEM_OBJECTPTR, s * sizeof (const char *));
  62         os->objects = objects;
  63         os->sobject = s;
  64     }
  65     os->objects[os->nobject++] = object;
  66     return FcTrue;
  67 }
  68
  69 void
  70 FcObjectSetDestroy (FcObjectSet *os)
  71 {
  72     if (os->objects)
  73     {
  74         FcMemFree (FC_MEM_OBJECTPTR, os->sobject * sizeof (const char *));
  75         free ((void *) os->objects);
  76     }
  77     FcMemFree (FC_MEM_OBJECTSET, sizeof (FcObjectSet));
  78     free (os);
  79 }
  80
  81 FcObjectSet *
  82 FcObjectSetVaBuild (const char *first, va_list va)
  83 {
  84     FcObjectSet    *ret;
  85
  86     FcObjectSetVapBuild (ret, first, va);
  87     return ret;
  88 }
  89
  90 FcObjectSet *
  91 FcObjectSetBuild (const char *first, ...)
  92 {
  93     va_list         va;
  94     FcObjectSet    *os;
  95
  96     va_start (va, first);
  97     FcObjectSetVapBuild (os, first, va);
  98     va_end (va);
  99     return os;
 100 }
 101
 102 static FcBool
 103 FcListValueListMatchAny (FcValueList *v1orig,
 104                          FcValueList *v2orig)
 105 {
 106     FcValueList     *v1, *v2;
 107
 108     for (v1 = v1orig; v1; v1 = v1->next)
 109         for (v2 = v2orig; v2; v2 = v2->next)
 110             if (FcConfigCompareValue (v2->value, FcOpContains, v1->value))
 111                 return FcTrue;
 112     return FcFalse;
 113 }
 114
 115 static FcBool
 116 FcListValueListEqual (FcValueList   *v1orig,
 117                       FcValueList   *v2orig)
 118 {
 119     FcValueList     *v1, *v2;
 120
 121     for (v1 = v1orig; v1; v1 = v1->next)
 122     {
 123         for (v2 = v2orig; v2; v2 = v2->next)
 124             if (FcConfigCompareValue (v1->value, FcOpEqual, v2->value))
 125                 break;
 126         if (!v2)
 127             return FcFalse;
 128     }
 129     for (v2 = v2orig; v2; v2 = v2->next)
 130     {
 131         for (v1 = v1orig; v1; v1 = v1->next)
 132             if (FcConfigCompareValue (v1->value, FcOpEqual, v2->value))
 133                 break;
 134         if (!v1)
 135             return FcFalse;
 136     }
 137     return FcTrue;
 138 }
 139
 140 /*
 141  * FcTrue iff all objects in "p" match "font"
 142  */
 143
 144 static FcBool
 145 FcListPatternMatchAny (FcPattern *p,
 146                        FcPattern *font)
 147 {
 148     int             i;
 149     FcPatternElt   *e;
 150
 151     for (i = 0; i < p->num; i++)
 152     {
 153         e = FcPatternFind (font, p->elts[i].object, FcFalse);
 154         if (!e)
 155             return FcFalse;
 156         if (!FcListValueListMatchAny (p->elts[i].values, e->values))
 157             return FcFalse;
 158     }
 159     return FcTrue;
 160 }
 161
 162 static FcBool
 163 FcListPatternEqual (FcPattern   *p1,
 164                     FcPattern   *p2,
 165                     FcObjectSet *os)
 166 {
 167     int             i;
 168     FcPatternElt    *e1, *e2;
 169
 170     for (i = 0; i < os->nobject; i++)
 171     {
 172         e1 = FcPatternFind (p1, os->objects[i], FcFalse);
 173         e2 = FcPatternFind (p2, os->objects[i], FcFalse);
 174         if (!e1 && !e2)
 175             return FcTrue;
 176         if (!e1 || !e2)
 177             return FcFalse;
 178         if (!FcListValueListEqual (e1->values, e2->values))
 179             return FcFalse;
 180     }
 181     return FcTrue;
 182 }
 183
 184 static FcChar32
 185 FcListStringHash (const FcChar8 *s)
 186 {
 187     FcChar32    h = 0;
 188     FcChar8     c;
 189
 190     while ((c = *s++))
 191     {
 192         c = FcToLower (c);
 193         h = ((h << 3) ^ (h >> 3)) ^ c;
 194     }
 195     return h;
 196 }
 197
 198 static FcChar32
 199 FcListMatrixHash (const FcMatrix *m)
 200 {
 201     int     xx = (int) (m->xx * 100),
 202             xy = (int) (m->xy * 100),
 203             yx = (int) (m->yx * 100),
 204             yy = (int) (m->yy * 100);
 205
 206     return ((FcChar32) xx) ^ ((FcChar32) xy) ^ ((FcChar32) yx) ^ ((FcChar32) yy);
 207 }
 208
 209 static FcChar32
 210 FcListValueHash (FcValue    v)
 211 {
 212     switch (v.type) {
 213     case FcTypeVoid:
 214         return 0;
 215     case FcTypeInteger:
 216         return (FcChar32) v.u.i;
 217     case FcTypeDouble:
 218         return (FcChar32) (int) v.u.d;
 219     case FcTypeString:
 220         return FcListStringHash (v.u.s);
 221     case FcTypeBool:
 222         return (FcChar32) v.u.b;
 223     case FcTypeMatrix:
 224         return FcListMatrixHash (v.u.m);
 225     case FcTypeCharSet:
 226         return FcCharSetCount (v.u.c);
 227     }
 228     return 0;
 229 }
 230
 231 static FcChar32
 232 FcListValueListHash (FcValueList    *list)
 233 {
 234     FcChar32    h = 0;
 235
 236     while (list)
 237     {
 238         h = h ^ FcListValueHash (list->value);
 239         list = list->next;
 240     }
 241     return h;
 242 }
 243
 244 static FcChar32
 245 FcListPatternHash (FcPattern    *font,
 246                    FcObjectSet  *os)
 247 {
 248     int             n;
 249     FcPatternElt    *e;
 250     FcChar32        h = 0;
 251
 252     for (n = 0; n < os->nobject; n++)
 253     {
 254         e = FcPatternFind (font, os->objects[n], FcFalse);
 255         if (e)
 256             h = h ^ FcListValueListHash (e->values);
 257     }
 258     return h;
 259 }
 260
 261 typedef struct _FcListBucket {
 262     struct _FcListBucket    *next;
 263     FcChar32                hash;
 264     FcPattern               *pattern;
 265 } FcListBucket;
 266
 267 #define FC_LIST_HASH_SIZE   4099
 268
 269 typedef struct _FcListHashTable {
 270     int             entries;
 271     FcListBucket    *buckets[FC_LIST_HASH_SIZE];
 272 } FcListHashTable;
 273
 274 static void
 275 FcListHashTableInit (FcListHashTable *table)
 276 {
 277     table->entries = 0;
 278     memset (table->buckets, '\0', sizeof (table->buckets));
 279 }
 280
 281 static void
 282 FcListHashTableCleanup (FcListHashTable *table)
 283 {
 284     int i;
 285     FcListBucket    *bucket, *next;
 286
 287     for (i = 0; i < FC_LIST_HASH_SIZE; i++)
 288     {
 289         for (bucket = table->buckets[i]; bucket; bucket = next)
 290         {
 291             next = bucket->next;
 292             FcPatternDestroy (bucket->pattern);
 293             FcMemFree (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 294             free (bucket);
 295         }
 296         table->buckets[i] = 0;
 297     }
 298     table->entries = 0;
 299 }
 300
 301 static FcBool
 302 FcListAppend (FcListHashTable   *table,
 303               FcPattern         *font,
 304               FcObjectSet       *os)
 305 {
 306     int             o;
 307     FcPatternElt    *e;
 308     FcValueList     *v;
 309     FcChar32        hash;
 310     FcListBucket    **prev, *bucket;
 311
 312     hash = FcListPatternHash (font, os);
 313     for (prev = &table->buckets[hash % FC_LIST_HASH_SIZE];
 314          (bucket = *prev); prev = &(bucket->next))
 315     {
 316         if (bucket->hash == hash &&
 317             FcListPatternEqual (bucket->pattern, font, os))
 318             return FcTrue;
 319     }
 320     bucket = (FcListBucket *) malloc (sizeof (FcListBucket));
 321     if (!bucket)
 322         goto bail0;
 323     FcMemAlloc (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 324     bucket->next = 0;
 325     bucket->hash = hash;
 326     bucket->pattern = FcPatternCreate ();
 327     if (!bucket->pattern)
 328         goto bail1;
 329
 330     for (o = 0; o < os->nobject; o++)
 331     {
 332         e = FcPatternFind (font, os->objects[o], FcFalse);
 333         if (e)
 334         {
 335             for (v = e->values; v; v = v->next)
 336             {
 337                 if (!FcPatternAdd (bucket->pattern,
 338                                    os->objects[o],
 339                                    v->value, FcTrue))
 340                     goto bail2;
 341             }
 342         }
 343     }
 344     *prev = bucket;
 345     ++table->entries;
 346
 347     return FcTrue;
 348
 349 bail2:
 350     FcPatternDestroy (bucket->pattern);
 351 bail1:
 352     FcMemFree (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 353     free (bucket);
 354 bail0:
 355     return FcFalse;
 356 }
 357
 358 FcFontSet *
 359 FcFontSetList (FcConfig     *config,
 360                FcFontSet    **sets,
 361                int          nsets,
 362                FcPattern    *p,
 363                FcObjectSet  *os)
 364 {
 365     FcFontSet       *ret;
 366     FcFontSet       *s;
 367     int             f;
 368     int             set;
 369     FcListHashTable table;
 370     int             i;
 371     FcListBucket    *bucket;
 372
 373     if (!config)
 374     {
 375         if (!FcInitBringUptoDate ())
 376             goto bail0;
 377
 378         config = FcConfigGetCurrent ();
 379         if (!config)
 380             goto bail0;
 381     }
 382     FcListHashTableInit (&table);
 383     /*
 384      * Walk all available fonts adding those that
 385      * match to the hash table
 386      */
 387     for (set = 0; set < nsets; set++)
 388     {
 389         s = sets[set];
 390         if (!s)
 391             continue;
 392         for (f = 0; f < s->nfont; f++)
 393             if (FcListPatternMatchAny (p, s->fonts[f]))
 394                 if (!FcListAppend (&table, s->fonts[f], os))
 395                     goto bail1;
 396     }
 397 #if 0
 398     {
 399         int     max = 0;
 400         int     full = 0;
 401         int     ents = 0;
 402         int     len;
 403         for (i = 0; i < FC_LIST_HASH_SIZE; i++)
 404         {
 405             if ((bucket = table.buckets[i]))
 406             {
 407                 len = 0;
 408                 for (; bucket; bucket = bucket->next)
 409                 {
 410                     ents++;
 411                     len++;
 412                 }
 413                 if (len > max)
 414                     max = len;
 415                 full++;
 416             }
 417         }
 418         printf ("used: %d max: %d avg: %g\n", full, max,
 419                 (double) ents / FC_LIST_HASH_SIZE);
 420     }
 421 #endif
 422     /*
 423      * Walk the hash table and build
 424      * a font set
 425      */
 426     ret = FcFontSetCreate ();
 427     if (!ret)
 428         goto bail0;
 429     for (i = 0; i < FC_LIST_HASH_SIZE; i++)
 430         while ((bucket = table.buckets[i]))
 431         {
 432             if (!FcFontSetAdd (ret, bucket->pattern))
 433                 goto bail2;
 434             table.buckets[i] = bucket->next;
 435             FcMemFree (FC_MEM_LISTBUCK, sizeof (FcListBucket));
 436             free (bucket);
 437         }
 438
 439     return ret;
 440
 441 bail2:
 442     FcFontSetDestroy (ret);
 443 bail1:
 444     FcListHashTableCleanup (&table);
 445 bail0:
 446     return 0;
 447 }
 448
 449 FcFontSet *
 450 FcFontList (FcConfig    *config,
 451             FcPattern   *p,
 452             FcObjectSet *os)
 453 {
 454     FcFontSet   *sets[2];
 455     int         nsets;
 456
 457     if (!config)
 458     {
 459         config = FcConfigGetCurrent ();
 460         if (!config)
 461             return 0;
 462     }
 463     nsets = 0;
 464     if (config->fonts[FcSetSystem])
 465         sets[nsets++] = config->fonts[FcSetSystem];
 466     if (config->fonts[FcSetApplication])
 467         sets[nsets++] = config->fonts[FcSetApplication];
 468     return FcFontSetList (config, sets, nsets, p, os);
 469 }