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/*
* This file is part of gitg
*
* Copyright (C) 2016 - Jesse van den Kieboom
*
* gitg 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.
*
* gitg 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 gitg. If not, see <http://www.gnu.org/licenses/>.
*/
class Gitg.DiffImageOverlay : DiffImageComposite
{
private double d_alpha;
public double alpha
{
get { return d_alpha; }
set
{
var newalpha = double.max(0, double.min(value, 1));
if (newalpha != d_alpha)
{
d_alpha = newalpha;
queue_draw();
}
}
}
construct
{
alpha = 0.5;
}
protected override bool draw(Cairo.Context cr)
{
base.draw(cr);
var window = get_window();
Gtk.Allocation alloc;
get_allocation(out alloc);
int image_width, image_height;
get_sizing(alloc.width, out image_width, out image_height);
var old_surface = cache.get_old_surface(window);
var new_surface = cache.get_new_surface(window);
int x = (alloc.width - image_width) / 2;
int y = 0;
if (old_surface != null && d_alpha != 1)
{
cr.set_source_surface(old_surface, x, y);
cr.paint_with_alpha(1 - d_alpha);
}
if (new_surface != null && d_alpha != 0)
{
cr.set_source_surface(new_surface, x, y);
cr.paint_with_alpha(d_alpha);
}
return true;
}
protected override void realize()
{
base.realize();
queue_resize();
}
}
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