:

Save subdirectory names in cache files to save time. This completely
    restores the original fontconfig API, BTW. Note that directories
    without fonts don't get a cache file; but then how many files would it
    have in that directory...

fc-cache/fc-cache.c

@@ -203,7 +203,7 @@ scanDirs (FcStrList *list, FcConfig *config, char *program, FcBool force, FcBool
 		printf ("caching, %d fonts, %d dirs\n", 
 			set->nfont, nsubdirs (subdirs));
 
-	    if (!FcDirSave (set, dir))
+	    if (!FcDirSave (set, subdirs, dir))
 	    {
 		fprintf (stderr, "Can't save cache in \"%s\"\n", dir);
 		ret++;

fontconfig/fontconfig.h

@@ -447,7 +447,7 @@ FcDirScan (FcFontSet	    *set,
 	   FcBool	    force);
 
 FcBool
-FcDirSave (FcFontSet *set, const FcChar8 *dir);
+FcDirSave (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir);
 
 /* fcfreetype.c */
 FcPattern *

src/fccache.c

@@ -46,7 +46,7 @@ static FcBool
 FcDirCacheConsume (int fd, FcFontSet *set);
 
 static FcBool
-FcDirCacheRead (FcFontSet * set, const FcChar8 *dir);
+FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir);
 
 static int
 FcCacheNextOffset(off_t w);
@@ -543,27 +543,11 @@ FcCacheReadDirs (FcConfig * config, FcGlobalCache * cache,
 	    free (file);
 	    continue;
 	}
-	d = opendir ((char *) dir);
-	if (!d)
-	{
-	    FcStrSetDestroy (subdirs);
-	    free (file);
-	    continue;
-	}
-	while ((e = readdir (d)))
-	{
-	    if (e->d_name[0] != '.' && strlen (e->d_name) < FC_MAX_FILE_LEN)
-	    {
-		strcpy ((char *) base, (char *) e->d_name);
-		if (FcFileIsDir (file) && !FcStrSetAdd (subdirs, file))
-		    ret++;
-	    }
-	}
-	closedir (d);
-	if (!FcDirCacheValid (dir) || !FcDirCacheRead (set, dir))
+	if (!FcDirCacheValid (dir) || !FcDirCacheRead (set, subdirs, dir))
 	{
 	    if (FcDebug () & FC_DBG_FONTSET)
 		printf ("scan dir %s\n", dir);
+
 	    FcDirScanConfig (set, subdirs, cache, 
 			     config->blanks, dir, FcFalse, config);
 	}
@@ -602,13 +586,14 @@ FcCacheRead (FcConfig *config, FcGlobalCache * cache)
 
 /* read serialized state from the cache file */
 static FcBool
-FcDirCacheRead (FcFontSet * set, const FcChar8 *dir)
+FcDirCacheRead (FcFontSet * set, FcStrSet * dirs, const FcChar8 *dir)
 {
     FcChar8         *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
     int fd;
     char * current_arch_machine_name;
     char candidate_arch_machine_name[9+MACHINE_SIGNATURE_SIZE];
     off_t current_arch_start = 0;
+    FcChar8	    subdirName[FC_MAX_FILE_LEN + 1 + 12 + 1];
 
     if (!cache_file)
         goto bail;
@@ -627,6 +612,9 @@ FcDirCacheRead (FcFontSet * set, const FcChar8 *dir)
 			   sizeof (candidate_arch_machine_name)) == 0)
 	goto bail1;
 
+    while (strlen(FcCacheReadString (fd, subdirName, sizeof (subdirName))) > 0)
+        FcStrSetAdd (dirs, subdirName);
+
     if (!FcDirCacheConsume (fd, set))
 	goto bail1;
 	
@@ -710,10 +698,10 @@ FcDirCacheProduce (FcFontSet *set, FcCache *metadata)
 
 /* write serialized state to the cache file */
 FcBool
-FcDirCacheWrite (FcFontSet *set, const FcChar8 *dir)
+FcDirCacheWrite (FcFontSet *set, FcStrSet *dirs, const FcChar8 *dir)
 {
     FcChar8         *cache_file = FcStrPlus (dir, (FcChar8 *) "/" FC_DIR_CACHE_FILE);
-    int fd;
+    int fd, i;
     FcCache metadata;
     off_t current_arch_start = 0, truncate_to;
     char * current_arch_machine_name, * header;
@@ -763,6 +751,10 @@ FcDirCacheWrite (FcFontSet *set, const FcChar8 *dir)
     if (!FcCacheWriteString (fd, header))
 	goto bail1;
 
+    for (i = 0; i < dirs->size; i++)
+        FcCacheWriteString (fd, dirs->strs[i]);
+    FcCacheWriteString (fd, "");
+
     write (fd, &metadata, sizeof(FcCache));
     lseek (fd, FcCacheNextOffset (lseek(fd, 0, SEEK_END)), SEEK_SET);
     write (fd, current_dir_block, metadata.count);

src/fcdir.c

@@ -212,7 +212,7 @@ FcDirScan (FcFontSet	    *set,
 }
 
 FcBool
-FcDirSave (FcFontSet *set, const FcChar8 *dir)
+FcDirSave (FcFontSet *set, FcStrSet * dirs, const FcChar8 *dir)
 {
-    return FcDirCacheWrite (set, dir);
+    return FcDirCacheWrite (set, dirs, dir);
 }

src/fcint.h

@@ -442,7 +442,7 @@ FcFontSet *
 FcCacheRead (FcConfig *config, FcGlobalCache * cache);
 
 FcBool
-FcDirCacheWrite (FcFontSet *set, const FcChar8 *dir);
+FcDirCacheWrite (FcFontSet *set, FcStrSet * dirs, const FcChar8 *dir);
 
 int
 FcCacheBankToIndex (int bank);