+++ /dev/null
-/* $TOG: patcache.c /main/8 1997/06/12 11:51:59 barstow $ */
-
-/*
-
-Copyright (c) 1991 X Consortium
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
-AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-Except as contained in this notice, the name of the X Consortium shall not be
-used in advertising or otherwise to promote the sale, use or other dealings
-in this Software without prior written authorization from the X Consortium.
-
-*/
-/* $XFree86: xc/lib/font/util/patcache.c,v 3.0.4.1 1997/07/05 15:55:37 dawes Exp $ */
-
-/*
- * Author: Keith Packard, MIT X Consortium
- */
-
-#include <fontmisc.h>
-#include <fontstruct.h>
-
-/*
- * Static sized hash table for looking up font name patterns
- *
- * LRU entries, reusing old entries
- */
-
-#define NBUCKETS 16
-#define NENTRIES 64
-
-#define UNSET (NENTRIES+1)
-
-typedef unsigned char EntryPtr;
-
-typedef struct _FontPatternCacheEntry {
- struct _FontPatternCacheEntry *next, **prev;
- short patlen;
- char *pattern;
- int hash;
- FontPtr pFont; /* associated font */
-} FontPatternCacheEntryRec, *FontPatternCacheEntryPtr;
-
-typedef struct _FontPatternCache {
- FontPatternCacheEntryPtr buckets[NBUCKETS];
- FontPatternCacheEntryRec entries[NENTRIES];
- FontPatternCacheEntryPtr free;
-} FontPatternCacheRec;
-
-/* Create and initialize cache */
-FontPatternCachePtr
-MakeFontPatternCache ()
-{
- FontPatternCachePtr cache;
- int i;
- cache = (FontPatternCachePtr) xalloc (sizeof *cache);
- if (!cache)
- return 0;
- for (i = 0; i < NENTRIES; i++) {
- cache->entries[i].patlen = 0;
- cache->entries[i].pattern = 0;
- cache->entries[i].pFont = 0;
- }
- EmptyFontPatternCache (cache);
- return cache;
-}
-
-/* toss cache */
-void
-FreeFontPatternCache (cache)
- FontPatternCachePtr cache;
-{
- int i;
-
- for (i = 0; i < NENTRIES; i++)
- xfree (cache->entries[i].pattern);
- xfree (cache);
-}
-
-/* compute id for string */
-static
-Hash (string, len)
- char *string;
- int len;
-{
- int hash;
-
- hash = 0;
- while (len--)
- hash = (hash << 1) ^ *string++;
- if (hash < 0)
- hash = -hash;
- return hash;
-}
-
-/* Empty cache (for rehash) */
-void
-EmptyFontPatternCache (cache)
- FontPatternCachePtr cache;
-{
- int i;
-
- for (i = 0; i < NBUCKETS; i++)
- cache->buckets[i] = 0;
- for (i = 0; i < NENTRIES; i++)
- {
- cache->entries[i].next = &cache->entries[i+1];
- cache->entries[i].prev = 0;
- cache->entries[i].pFont = 0;
- xfree (cache->entries[i].pattern);
- cache->entries[i].pattern = 0;
- cache->entries[i].patlen = 0;
- }
- cache->free = &cache->entries[0];
- cache->entries[NENTRIES - 1].next = 0;
-}
-
-/* add entry */
-void
-CacheFontPattern (cache, pattern, patlen, pFont)
- FontPatternCachePtr cache;
- char *pattern;
- int patlen;
- FontPtr pFont;
-{
- FontPatternCacheEntryPtr e;
- char *newpat;
- int i;
-
- newpat = (char *) xalloc (patlen);
- if (!newpat)
- return;
- if (cache->free)
- {
- e = cache->free;
- cache->free = e->next;
- }
- else
- {
- i = rand ();
- if (i < 0)
- i = -i;
- i %= NENTRIES;
- e = &cache->entries[i];
- if (e->next)
- e->next->prev = e->prev;
- *e->prev = e->next;
- xfree (e->pattern);
- }
- /* set pattern */
- memcpy (newpat, pattern, patlen);
- e->pattern = newpat;
- e->patlen = patlen;
- /* link to new hash chain */
- e->hash = Hash (pattern, patlen);
- i = e->hash % NBUCKETS;
- e->next = cache->buckets[i];
- if (e->next)
- e->next->prev = &(e->next);
- cache->buckets[i] = e;
- e->prev = &(cache->buckets[i]);
- e->pFont = pFont;
-}
-
-/* find matching entry */
-FontPtr
-FindCachedFontPattern (cache, pattern, patlen)
- FontPatternCachePtr cache;
- char *pattern;
- int patlen;
-{
- int hash;
- int i;
- FontPatternCacheEntryPtr e;
-
- hash = Hash (pattern, patlen);
- i = hash % NBUCKETS;
- for (e = cache->buckets[i]; e; e = e->next)
- {
- if (e->patlen == patlen && e->hash == hash &&
- !memcmp (e->pattern, pattern, patlen))
- {
- return e->pFont;
- }
- }
- return 0;
-}
-
-void
-RemoveCachedFontPattern (cache, pFont)
- FontPatternCachePtr cache;
- FontPtr pFont;
-{
- FontPatternCacheEntryPtr e;
- int i;
-
- for (i = 0; i < NENTRIES; i++)
- {
- if ((e = &cache->entries[i])->pFont == pFont)
- {
- e->pFont = 0;
- if (e->next)
- e->next->prev = e->prev;
- *e->prev = e->next;
- e->next = cache->free;
- cache->free = e;
- xfree (e->pattern);
- e->pattern = 0;
- }
- }
-}
projects / rdpsrv / blobdiff