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/* GTK - The GIMP Toolkit
* Copyright (C) 2015 Benjamin Otte <otte@gnome.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkcssnodestylecacheprivate.h"
#include "gtkdebug.h"
#include "gtkcssstaticstyleprivate.h"
struct _GtkCssNodeStyleCache {
guint ref_count;
GtkCssStyle *style;
GHashTable *children;
};
#define UNPACK_DECLARATION(packed) ((GtkCssNodeDeclaration *) (GPOINTER_TO_SIZE (packed) & ~0x3))
#define UNPACK_FLAGS(packed) (GPOINTER_TO_SIZE (packed) & 0x3)
#define PACK(decl, first_child, last_child) GSIZE_TO_POINTER (GPOINTER_TO_SIZE (decl) | ((first_child) ? 0x2 : 0) | ((last_child) ? 0x1 : 0))
GtkCssNodeStyleCache *
gtk_css_node_style_cache_new (GtkCssStyle *style)
{
GtkCssNodeStyleCache *result;
result = g_slice_new0 (GtkCssNodeStyleCache);
result->ref_count = 1;
result->style = g_object_ref (style);
return result;
}
GtkCssNodeStyleCache *
gtk_css_node_style_cache_ref (GtkCssNodeStyleCache *cache)
{
cache->ref_count++;
return cache;
}
void
gtk_css_node_style_cache_unref (GtkCssNodeStyleCache *cache)
{
cache->ref_count--;
if (cache->ref_count > 0)
return;
g_object_unref (cache->style);
if (cache->children)
g_hash_table_unref (cache->children);
g_slice_free (GtkCssNodeStyleCache, cache);
}
GtkCssStyle *
gtk_css_node_style_cache_get_style (GtkCssNodeStyleCache *cache)
{
return cache->style;
}
static gboolean
may_be_stored_in_cache (GtkCssStyle *style)
{
GtkCssChange change;
/* If you run your application with
* GTK_DEBUG=no-css-cache
* no caching will happen. This is slow (in particular
* when animating), but useful for figuring out bugs.
*
* We achieve that by disallowing any inserts into caches here.
*/
#ifdef G_ENABLE_DEBUG
if (GTK_DEBUG_CHECK (NO_CSS_CACHE))
return FALSE;
#endif
if (!GTK_IS_CSS_STATIC_STYLE (style))
return FALSE;
change = gtk_css_static_style_get_change (GTK_CSS_STATIC_STYLE (style));
/* The cache is shared between all children of the parent, so if a
* style depends on a sibling it is not independant of the child.
*/
if (change & GTK_CSS_CHANGE_ANY_SIBLING)
return FALSE;
/* Again, the cache is shared between all children of the parent.
* If the position is relevant, no child has the same style.
*/
if (change & (GTK_CSS_CHANGE_NTH_CHILD | GTK_CSS_CHANGE_NTH_LAST_CHILD))
return FALSE;
return TRUE;
}
static guint
gtk_css_node_style_cache_decl_hash (gconstpointer item)
{
return gtk_css_node_declaration_hash (UNPACK_DECLARATION (item)) << 2
| UNPACK_FLAGS (item);
}
static gboolean
gtk_css_node_style_cache_decl_equal (gconstpointer item1,
gconstpointer item2)
{
if (UNPACK_FLAGS (item1) != UNPACK_FLAGS (item2))
return FALSE;
return gtk_css_node_declaration_equal (UNPACK_DECLARATION (item1),
UNPACK_DECLARATION (item2));
}
static void
gtk_css_node_style_cache_decl_free (gpointer item)
{
gtk_css_node_declaration_unref (UNPACK_DECLARATION (item));
}
GtkCssNodeStyleCache *
gtk_css_node_style_cache_insert (GtkCssNodeStyleCache *parent,
GtkCssNodeDeclaration *decl,
gboolean is_first,
gboolean is_last,
GtkCssStyle *style)
{
GtkCssNodeStyleCache *result;
if (!may_be_stored_in_cache (style))
return NULL;
if (parent->children == NULL)
parent->children = g_hash_table_new_full (gtk_css_node_style_cache_decl_hash,
gtk_css_node_style_cache_decl_equal,
gtk_css_node_style_cache_decl_free,
(GDestroyNotify) gtk_css_node_style_cache_unref);
result = gtk_css_node_style_cache_new (style);
g_hash_table_insert (parent->children,
PACK (gtk_css_node_declaration_ref (decl), is_first, is_last),
gtk_css_node_style_cache_ref (result));
return result;
}
GtkCssNodeStyleCache *
gtk_css_node_style_cache_lookup (GtkCssNodeStyleCache *parent,
GtkCssNodeDeclaration *decl,
gboolean is_first,
gboolean is_last)
{
GtkCssNodeStyleCache *result;
if (parent->children == NULL)
return NULL;
result = g_hash_table_lookup (parent->children, PACK (decl, is_first, is_last));
if (result == NULL)
return NULL;
return gtk_css_node_style_cache_ref (result);
}
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