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Diffstat (limited to 'glabels2/src/pixbuf-cache.c')
| -rw-r--r-- | glabels2/src/pixbuf-cache.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/glabels2/src/pixbuf-cache.c b/glabels2/src/pixbuf-cache.c new file mode 100644 index 0000000..df67604 --- /dev/null +++ b/glabels2/src/pixbuf-cache.c @@ -0,0 +1,254 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- */ + +/* + * (GLABELS) Label and Business Card Creation program for GNOME + * + * pixbuf-cache.c: GLabels pixbuf cache module + * + * Copyright (C) 2003 Jim Evins <evins@snaught.com>. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include <config.h> + +#include "pixbuf-cache.h" + +#include "debug.h" + +/*========================================================*/ +/* Private types. */ +/*========================================================*/ + +typedef struct { + gchar *key; + guint references; + GdkPixbuf *pixbuf; +} CacheRecord; + +/*========================================================*/ +/* Private globals. */ +/*========================================================*/ + +/*========================================================*/ +/* Private function prototypes. */ +/*========================================================*/ + +static void record_destroy (gpointer val); + +static void add_name_to_list (gpointer key, + gpointer val, + gpointer user_data); + + +/*---------------------------------------------------------------------------*/ +/* PRIVATE. Destroy cache record. */ +/*---------------------------------------------------------------------------*/ +static void +record_destroy (gpointer val) +{ + CacheRecord *record = (CacheRecord *)val; + + g_return_if_fail (record); + + g_free (record->key); + g_object_unref (record->pixbuf); + g_free (record); +} + +/*****************************************************************************/ +/* Create a new hash table to keep track of cached pixbufs. */ +/*****************************************************************************/ +GHashTable * +gl_pixbuf_cache_new (void) +{ + GHashTable *pixbuf_cache; + + gl_debug (DEBUG_PIXBUF_CACHE, "START"); + + pixbuf_cache = g_hash_table_new_full (g_str_hash, + g_str_equal, + NULL, + record_destroy); + + gl_debug (DEBUG_PIXBUF_CACHE, "END pixbuf_cache=%p", pixbuf_cache); + + return pixbuf_cache; +} + +/*****************************************************************************/ +/* Free up previously allocated hash table and its contents. */ +/*****************************************************************************/ +void +gl_pixbuf_cache_free (GHashTable *pixbuf_cache) +{ + gl_debug (DEBUG_PIXBUF_CACHE, "START"); + + g_hash_table_destroy (pixbuf_cache); + + gl_debug (DEBUG_PIXBUF_CACHE, "END"); +} + +/*****************************************************************************/ +/* Add pixbuf to cache explicitly (not a reference). */ +/*****************************************************************************/ +void +gl_pixbuf_cache_add_pixbuf (GHashTable *pixbuf_cache, + gchar *name, + GdkPixbuf *pixbuf) +{ + CacheRecord *test_record, *record; + + gl_debug (DEBUG_PIXBUF_CACHE, "START"); + + test_record = g_hash_table_lookup (pixbuf_cache, name); + if (test_record != NULL) { + /* pixbuf is already in the cache. */ + gl_debug (DEBUG_PIXBUF_CACHE, "END already in cache"); + return; + } + + record = g_new0 (CacheRecord, 1); + record->key = g_strdup (name); + record->references = 0; /* Nobody has referenced it yet. */ + record->pixbuf = g_object_ref (G_OBJECT (pixbuf)); + + g_hash_table_insert (pixbuf_cache, record->key, record); + + gl_debug (DEBUG_PIXBUF_CACHE, "END"); +} + +/*****************************************************************************/ +/* Get pixbuf. If not in cache, read it and add to cache. */ +/*****************************************************************************/ +GdkPixbuf * +gl_pixbuf_cache_get_pixbuf (GHashTable *pixbuf_cache, + gchar *name) +{ + CacheRecord *record; + GdkPixbuf *pixbuf; + + gl_debug (DEBUG_PIXBUF_CACHE, "START pixbuf_cache=%p", pixbuf_cache); + + record = g_hash_table_lookup (pixbuf_cache, name); + + if (record != NULL) { + record->references++; + gl_debug (DEBUG_PIXBUF_CACHE, "references=%d", record->references); + gl_debug (DEBUG_PIXBUF_CACHE, "END cached"); + return record->pixbuf; + } + + + pixbuf = gdk_pixbuf_new_from_file (name, NULL); + if ( pixbuf != NULL) { + record = g_new0 (CacheRecord, 1); + record->key = g_strdup (name); + record->references = 1; + record->pixbuf = pixbuf; + + g_hash_table_insert (pixbuf_cache, record->key, record); + } + + gl_debug (DEBUG_PIXBUF_CACHE, "END"); + + return pixbuf; +} + +/*****************************************************************************/ +/* Remove pixbuf, but only if no references left. */ +/*****************************************************************************/ +void +gl_pixbuf_cache_remove_pixbuf (GHashTable *pixbuf_cache, + gchar *name) +{ + CacheRecord *record; + + if (name == NULL) return; + + gl_debug (DEBUG_PIXBUF_CACHE, "START"); + + record = g_hash_table_lookup (pixbuf_cache, name); + if (record == NULL) { + gl_debug (DEBUG_PIXBUF_CACHE, "END not in cache"); + return; + } + + record->references--; + + if ( record->references == 0 ) { + g_hash_table_remove (pixbuf_cache, name); + } + + gl_debug (DEBUG_PIXBUF_CACHE, "END"); +} + +/*---------------------------------------------------------------------------*/ +/* PRIVATE. Add a name to a GList while iterating over cache. */ +/*---------------------------------------------------------------------------*/ +static void +add_name_to_list (gpointer key, + gpointer val, + gpointer user_data) +{ + gchar *name = (gchar *)key; + GList **name_list = (GList **)user_data; + + gl_debug (DEBUG_PIXBUF_CACHE, "START"); + + gl_debug (DEBUG_PIXBUF_CACHE, "adding name=%s", name); + + *name_list = g_list_append (*name_list, g_strdup(name)); + + gl_debug (DEBUG_PIXBUF_CACHE, "END"); +} + +/*****************************************************************************/ +/* Return a list of names for all pixbufs in the cache. */ +/*****************************************************************************/ +GList * +gl_pixbuf_cache_get_name_list (GHashTable *pixbuf_cache) +{ + GList *name_list = NULL; + + gl_debug (DEBUG_PIXBUF_CACHE, "START"); + + g_hash_table_foreach (pixbuf_cache, add_name_to_list, &name_list); + + gl_debug (DEBUG_PIXBUF_CACHE, "END"); + + return name_list; +} + +/*****************************************************************************/ +/* Free up a list of pixbuf names. */ +/*****************************************************************************/ +void +gl_pixbuf_cache_free_name_list (GList *name_list) +{ + GList *p_name; + + gl_debug (DEBUG_PIXBUF_CACHE, "START"); + + for (p_name = name_list; p_name != NULL; p_name = p_name->next) { + g_free (p_name->data); + p_name->data = NULL; + } + + g_list_free (name_list); + + gl_debug (DEBUG_PIXBUF_CACHE, "END"); +} + + |