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/* Pango
* pangoft2-fontcache.c: Cache of FreeType2 faces (FT_Face)
*
* Copyright (C) 2000 Red Hat Software
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "pangoft2-private.h"
#include <string.h>
/* Font cache
*/
/* Number of fonts to retain after they are not otherwise referenced.
*/
#define CACHE_SIZE 10
typedef struct _CacheEntry CacheEntry;
struct _PangoFT2FontCache
{
FT_Library library;
GHashTable *forward;
GHashTable *back;
GList *mru;
GList *mru_tail;
int mru_count;
};
struct _CacheEntry
{
PangoFT2OA oa;
FT_Face face;
gint ref_count;
GList *mru;
};
static void
free_cache_entry (PangoFT2OA *oa,
CacheEntry *entry,
PangoFT2FontCache *cache)
{
FT_Error error;
PING (("FT_Done_Face (%p)\n", entry->face));
error = FT_Done_Face (entry->face);
if (error != FT_Err_Ok)
g_warning ("Error from FT_Done_Face: %s",
pango_ft2_ft_strerror (error));
g_free (entry);
}
/**
* pango_ft2_font_cache_free:
* @cache: a #PangoFT2FontCache
*
* Free a #PangoFT2FontCache and all associated memory. All fonts loaded
* through this font cache will be freed along with the cache.
**/
void
pango_ft2_font_cache_free (PangoFT2FontCache *cache)
{
g_return_if_fail (cache != NULL);
g_hash_table_foreach (cache->forward, (GHFunc)free_cache_entry, cache);
g_hash_table_destroy (cache->forward);
g_hash_table_destroy (cache->back);
g_list_free (cache->mru);
}
static guint
oa_hash (gconstpointer v)
{
PangoFT2OA *oa = (PangoFT2OA *) v;
if (oa->open_args->flags & ft_open_memory)
return (guint) oa->open_args->memory_base;
else if (oa->open_args->flags == ft_open_pathname)
return g_str_hash (oa->open_args->pathname);
else if (oa->open_args->flags & ft_open_stream)
return (guint) oa->open_args->stream;
else
return 0;
}
static gint
oa_equal (gconstpointer v1,
gconstpointer v2)
{
PangoFT2OA *oa1 = (PangoFT2OA *) v1;
PangoFT2OA *oa2 = (PangoFT2OA *) v2;
if (oa1->open_args->flags != oa2->open_args->flags)
return 0;
else if (oa1->open_args->flags & ft_open_memory)
return (oa1->open_args->memory_base == oa2->open_args->memory_base &&
oa1->face_index == oa2->face_index);
else if (oa1->open_args->flags == ft_open_pathname)
return (strcmp (oa1->open_args->pathname,
oa2->open_args->pathname) == 0 &&
oa1->face_index == oa2->face_index);
else if (oa1->open_args->flags & ft_open_stream)
return (oa1->open_args->stream == oa2->open_args->stream &&
oa1->face_index == oa2->face_index);
else
return 0;
}
/**
* pango_ft2_font_cache_new:
*
* Create a font cache.
*
* Return value: The new font cache. This must be freed with
* pango_ft2_font_cache_free().
**/
PangoFT2FontCache *
pango_ft2_font_cache_new (FT_Library library)
{
PangoFT2FontCache *cache;
cache = g_new (PangoFT2FontCache, 1);
cache->library = library;
cache->forward = g_hash_table_new (oa_hash, oa_equal);
cache->back = g_hash_table_new (g_direct_hash, g_direct_equal);
cache->mru = NULL;
cache->mru_tail = NULL;
cache->mru_count = 0;
return cache;
}
static void
cache_entry_unref (PangoFT2FontCache *cache,
CacheEntry *entry)
{
entry->ref_count--;
PING (("face:%p ref_count:%d\n", entry->face, entry->ref_count));
if (entry->ref_count == 0)
{
g_hash_table_remove (cache->forward, &entry->oa);
g_hash_table_remove (cache->back, entry->face);
free_cache_entry (NULL, entry, cache);
}
}
/**
* pango_ft2_font_cache_load:
* @cache: a #PangoFT2FontCache
*
* Load a #FT_Face from #FT_Open_Args and a face index. The
* result may be newly loaded, or it may have been previously
* stored
*
* Return value: The #FT_Face, or %NULL if the font could
* not be loaded. In order to free this structure, you must call
* pango_ft2_font_cache_unload().
**/
FT_Face
pango_ft2_font_cache_load (PangoFT2FontCache *cache,
FT_Open_Args *args,
FT_Long face_index)
{
CacheEntry *entry;
PangoFT2OA oa;
g_return_val_if_fail (cache != NULL, NULL);
g_return_val_if_fail (args != NULL, NULL);
oa.open_args = args;
oa.face_index = face_index;
entry = g_hash_table_lookup (cache->forward, &oa);
if (entry)
entry->ref_count++;
else
{
FT_Face face;
FT_Error error;
PING (("FT_Open_Face (%s,%ld)\n", args->pathname, face_index));
error = FT_Open_Face (cache->library, args, face_index, &face);
if (error != FT_Err_Ok)
{
g_warning ("Error from FT_Open_Face: %s",
pango_ft2_ft_strerror (error));
return NULL;
}
PING ((" = %p\n", face));
entry = g_new (CacheEntry, 1);
entry->oa = oa;
entry->face = face;
entry->ref_count = 1;
entry->mru = NULL;
g_hash_table_insert (cache->forward, &entry->oa, entry);
g_hash_table_insert (cache->back, entry->face, entry);
}
if (entry->mru)
{
if (cache->mru_count > 1 && entry->mru->prev)
{
/* Move to the head of the mru list */
if (entry->mru == cache->mru_tail)
{
cache->mru_tail = cache->mru_tail->prev;
cache->mru_tail->next = NULL;
}
else
{
entry->mru->prev->next = entry->mru->next;
entry->mru->next->prev = entry->mru->prev;
}
entry->mru->next = cache->mru;
entry->mru->prev = NULL;
cache->mru->prev = entry->mru;
cache->mru = entry->mru;
}
}
else
{
entry->ref_count++;
/* Insert into the mru list */
if (cache->mru_count == CACHE_SIZE)
{
CacheEntry *old_entry = cache->mru_tail->data;
cache->mru_tail = cache->mru_tail->prev;
cache->mru_tail->next = NULL;
g_list_free_1 (old_entry->mru);
old_entry->mru = NULL;
cache_entry_unref (cache, old_entry);
}
else
cache->mru_count++;
cache->mru = g_list_prepend (cache->mru, entry);
if (!cache->mru_tail)
cache->mru_tail = cache->mru;
entry->mru = cache->mru;
}
return entry->face;
}
/**
* pango_ft2_font_cache_unload:
* @cache: a #PangoFT2FontCache
* @face: the face to unload
*
* Free a font structure previously loaded with pango_ft2_font_cache_load()
**/
void
pango_ft2_font_cache_unload (PangoFT2FontCache *cache,
FT_Face face)
{
CacheEntry *entry;
g_return_if_fail (cache != NULL);
g_return_if_fail (face != NULL);
entry = g_hash_table_lookup (cache->back, face);
g_return_if_fail (entry != NULL);
PING (("pango_ft2_font_cache_unload\n"));
cache_entry_unref (cache, entry);
}
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