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/* Copyright 2010 Maxim Kartashev
* Copyright 2016 Software Freedom Conservancy Inc.
*
* 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 SlideEffectDescriptor : ShotwellTransitionDescriptor {
public SlideEffectDescriptor(GLib.File resource_directory) {
base(resource_directory);
}
public override unowned string get_id() {
return "org.yorba.shotwell.transitions.slide";
}
public override unowned string get_pluggable_name() {
return _("Slide");
}
public override Transitions.Effect create(Spit.HostInterface host) {
return new SlideEffect();
}
}
private class SlideEffect : Object, Transitions.Effect {
private const int DESIRED_FPS = 25;
private const int MIN_FPS = 15;
public SlideEffect() {
}
public void get_fps(out int desired_fps, out int min_fps) {
desired_fps = SlideEffect.DESIRED_FPS;
min_fps = SlideEffect.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);
if (visuals.from_pixbuf != null) {
int from_target_x = (motion.direction == Transitions.Direction.FORWARD)
? -visuals.from_pixbuf.width : width;
int from_current_x = (int) (visuals.from_pos.x * (1 - alpha) + from_target_x * alpha);
Gdk.cairo_set_source_pixbuf(ctx, visuals.from_pixbuf, from_current_x, visuals.from_pos.y);
ctx.paint();
}
if (visuals.to_pixbuf != null) {
int to_target_x = (width - visuals.to_pixbuf.width) / 2;
int from_x = (motion.direction == Transitions.Direction.FORWARD)
? width : -visuals.to_pixbuf.width;
int to_current_x = (int) (from_x * (1 - alpha) + to_target_x * alpha);
Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf, to_current_x, visuals.to_pos.y);
ctx.paint();
}
}
public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
}
public void cancel() {
}
}
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