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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 (Cairo.Context c, 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 = new Cairo.Surface.similar (c.get_target (), Cairo.Content.COLOR_ALPHA, pixbuf.width, pixbuf.height);
var new_c = new Cairo.Context (surface);
Gdk.cairo_set_source_pixbuf (new_c, pixbuf, 0, 0);
new_c.paint ();
surface_table.insert (pixbuf, surface);
}
return surface;
}
public CachedImage (Gdk.Pixbuf? pixbuf)
{
Object (pixbuf: pixbuf);
}
public override bool draw (Cairo.Context c)
{
if (pixbuf != null)
{
var cached_surface = get_cached_surface (c, pixbuf);
if (cached_surface != null)
{
c.set_source_surface (cached_surface, 0, 0);
c.paint ();
}
}
return false;
}
}
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