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/* gtksizerequest.c
* Copyright (C) 2007-2010 Openismus GmbH
*
* Authors:
* Mathias Hasselmann <mathias@openismus.com>
* Tristan Van Berkom <tristan.van.berkom@gmail.com>
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "gtksizerequestcacheprivate.h"
#include <string.h>
void
_gtk_size_request_cache_init (SizeRequestCache *cache)
{
memset (cache, 0, sizeof (SizeRequestCache));
}
static void
free_sizes (SizeRequest **sizes)
{
gint i;
for (i = 0; i < GTK_SIZE_REQUEST_CACHED_SIZES && sizes[i] != NULL; i++)
g_slice_free (SizeRequest, sizes[i]);
g_slice_free1 (sizeof (SizeRequest *) * GTK_SIZE_REQUEST_CACHED_SIZES, sizes);
}
void
_gtk_size_request_cache_free (SizeRequestCache *cache)
{
guint i;
for (i = 0; i < 2; i++)
{
if (cache->requests[i])
free_sizes (cache->requests[i]);
}
}
void
_gtk_size_request_cache_clear (SizeRequestCache *cache)
{
_gtk_size_request_cache_free (cache);
_gtk_size_request_cache_init (cache);
}
void
_gtk_size_request_cache_commit (SizeRequestCache *cache,
GtkOrientation orientation,
gint for_size,
gint minimum_size,
gint natural_size)
{
SizeRequest **cached_sizes;
SizeRequest *cached_size;
guint i, n_sizes;
/* First handle caching of the base requests */
if (for_size < 0)
{
cache->cached_size[orientation].minimum_size = minimum_size;
cache->cached_size[orientation].natural_size = natural_size;
cache->flags[orientation].cached_size_valid = TRUE;
return;
}
/* Check if the minimum_size and natural_size is already
* in the cache and if this result can be used to extend
* that cache entry
*/
cached_sizes = cache->requests[orientation];
n_sizes = cache->flags[orientation].n_cached_requests;
for (i = 0; i < n_sizes; i++)
{
if (cached_sizes[i]->cached_size.minimum_size == minimum_size &&
cached_sizes[i]->cached_size.natural_size == natural_size)
{
cached_sizes[i]->lower_for_size = MIN (cached_sizes[i]->lower_for_size, for_size);
cached_sizes[i]->upper_for_size = MAX (cached_sizes[i]->upper_for_size, for_size);
return;
}
}
/* If not found, pull a new size from the cache, the returned size cache
* will immediately be used to cache the new computed size so we go ahead
* and increment the last_cached_request right away */
if (n_sizes < GTK_SIZE_REQUEST_CACHED_SIZES)
{
cache->flags[orientation].n_cached_requests++;
cache->flags[orientation].last_cached_request = cache->flags[orientation].n_cached_requests - 1;
}
else
{
if (++cache->flags[orientation].last_cached_request == GTK_SIZE_REQUEST_CACHED_SIZES)
cache->flags[orientation].last_cached_request = 0;
}
if (cache->requests[orientation] == NULL)
cache->requests[orientation] = g_slice_alloc0 (sizeof (SizeRequest *) * GTK_SIZE_REQUEST_CACHED_SIZES);
if (cache->requests[orientation][cache->flags[orientation].last_cached_request] == NULL)
cache->requests[orientation][cache->flags[orientation].last_cached_request] = g_slice_new (SizeRequest);
cached_size = cache->requests[orientation][cache->flags[orientation].last_cached_request];
cached_size->lower_for_size = for_size;
cached_size->upper_for_size = for_size;
cached_size->cached_size.minimum_size = minimum_size;
cached_size->cached_size.natural_size = natural_size;
}
/* looks for a cached size request for this for_size.
*
* Note that this caching code was originally derived from
* the Clutter toolkit but has evolved for other GTK+ requirements.
*/
gboolean
_gtk_size_request_cache_lookup (SizeRequestCache *cache,
GtkOrientation orientation,
gint for_size,
gint *minimum,
gint *natural)
{
CachedSize *result = NULL;
if (for_size < 0)
{
if (cache->flags[orientation].cached_size_valid)
result = &cache->cached_size[orientation];
}
else
{
guint i;
/* Search for an already cached size */
for (i = 0; i < cache->flags[orientation].n_cached_requests; i++)
{
SizeRequest *cur = cache->requests[orientation][i];
if (cur->lower_for_size <= for_size &&
cur->upper_for_size >= for_size)
{
result = &cur->cached_size;
break;
}
}
}
if (result)
{
*minimum = result->minimum_size;
*natural = result->natural_size;
return TRUE;
}
else
return FALSE;
}
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