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/* Copyright 2013 Jens Bav
* 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 StripesEffectDescriptor : ShotwellTransitionDescriptor {
public StripesEffectDescriptor(GLib.File resource_directory) {
base(resource_directory);
}
public override unowned string get_id() {
return "org.yorba.shotwell.transitions.stripes";
}
public override unowned string get_pluggable_name() {
return _("Stripes");
}
public override Transitions.Effect create(HostInterface host) {
return new StripesEffect();
}
}
private class StripesEffect : Object, Transitions.Effect {
private const int DESIRED_FPS = 25;
private const int MIN_FPS = 10;
private const int STRIPE_HEIGHT = 100;
private int stripe_count;
public StripesEffect() {
}
public void get_fps(out int desired_fps, out int min_fps) {
desired_fps = StripesEffect.DESIRED_FPS;
min_fps = StripesEffect.MIN_FPS;
}
public void start(Transitions.Visuals visuals, Transitions.Motion motion) {
stripe_count = visuals.to_pos.height / STRIPE_HEIGHT + 1;
}
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) {
Gdk.cairo_set_source_pixbuf(ctx, visuals.from_pixbuf, visuals.from_pos.x,
visuals.from_pos.y);
ctx.paint_with_alpha(1 - Math.fmin(1, alpha * 2));
}
if (visuals.to_pixbuf != null) {
Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf,visuals.to_pos.x, visuals.to_pos.y);
int x = visuals.to_pos.x;
int y = visuals.to_pos.y;
for (int i = 0; i <= stripe_count; i++) {
if (i % 2 == motion.direction) {
ctx.rectangle(x + visuals.to_pos.width - alpha * visuals.to_pos.width,
y + i * STRIPE_HEIGHT, x + visuals.to_pos.width, STRIPE_HEIGHT);
} else {
ctx.rectangle(x, y + STRIPE_HEIGHT * i, visuals.to_pos.width * alpha,
STRIPE_HEIGHT);
}
}
ctx.clip();
ctx.paint_with_alpha(alpha);
}
}
public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
}
public void cancel() {
}
}
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