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/* Copyright 2010 Maxim Kartashev
* Copyright 2011-2015 Yorba Foundation
*
* This software is licensed under the GNU Lesser General Public License
* (version 2.1 or later). See the COPYING file in this distribution.
*/
using Spit;
private class FadeEffectDescriptor : ShotwellTransitionDescriptor {
public FadeEffectDescriptor(GLib.File resource_directory) {
base(resource_directory);
}
public override unowned string get_id() {
return "org.yorba.shotwell.transitions.fade";
}
public override unowned string get_pluggable_name() {
return _("Fade");
}
public override Transitions.Effect create(Spit.HostInterface host) {
return new FadeEffect();
}
}
private class FadeEffect : Object, Transitions.Effect {
private const int DESIRED_FPS = 30;
private const int MIN_FPS = 20;
public FadeEffect() {
}
public void get_fps(out int desired_fps, out int min_fps) {
desired_fps = FadeEffect.DESIRED_FPS;
min_fps = FadeEffect.MIN_FPS;
}
public void start(Transitions.Visuals visuals, Transitions.Motion motion) {
}
public bool needs_clear_background() {
return true;
}
public void paint(Transitions.Visuals visuals, Transitions.Motion motion, Cairo.Context ctx,
int width, int height, int frame_number) {
double alpha = motion.get_alpha(frame_number);
// blend the two pixbufs using an alpha of the appropriate level depending on how far
// the cycle has progressed
if (visuals.from_pixbuf != null) {
Gdk.cairo_set_source_pixbuf(ctx, visuals.from_pixbuf, visuals.from_pos.x, visuals.from_pos.y);
ctx.paint_with_alpha(1.0 - alpha);
}
if (visuals.to_pixbuf != null) {
Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf, visuals.to_pos.x, visuals.to_pos.y);
ctx.paint_with_alpha(alpha);
}
}
public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
}
public void cancel() {
}
}
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