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/* -*- Mode: Vala; indent-tabs-mode: nil; tab-width: 4 -*-
*
* Copyright (C) 2012 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* Authors: Michael Terry <michael.terry@canonical.com>
*/
public class CachedImage : Gtk.Image
{
private static HashTable<Gdk.Pixbuf, Cairo.Surface> surface_table;
public static Cairo.Surface? get_cached_surface (Gdk.Pixbuf pixbuf)
{
if (surface_table == null)
surface_table = new HashTable<Gdk.Pixbuf, Cairo.Surface> (direct_hash, direct_equal);
var surface = surface_table.lookup (pixbuf);
if (surface == null)
{
surface = Gdk.cairo_surface_create_from_pixbuf (pixbuf, _scale_factor, null);
surface_table.insert (pixbuf, surface);
}
return surface;
}
private void update_image(Gdk.Pixbuf? pixbuf)
{
if (pixbuf != null)
{
surface = get_cached_surface (pixbuf);
}
else
{
surface = null;
pixbuf = null;
}
}
public CachedImage (Gdk.Pixbuf? pixbuf)
{
update_image (pixbuf);
}
public void set_pixbuf(Gdk.Pixbuf? pixbuf)
{
update_image (pixbuf);
}
}
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