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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 CrumbleEffectDescriptor : ShotwellTransitionDescriptor {
public CrumbleEffectDescriptor() {
base();
}
public override unowned string get_id() {
return "org.gnome.shotwell.transitions.crumble";
}
public override unowned string get_pluggable_name() {
return _("Crumble");
}
public override Transitions.Effect create(Spit.HostInterface host) {
return new CrumbleEffect();
}
}
private class CrumbleEffect : Object, Transitions.Effect {
private const int DESIRED_FPS = 25;
private const int MIN_FPS = 15;
private const int STRIPE_WIDTH = 10;
private Cairo.ImageSurface[] from_stripes;
private double[] accelerations;
private int stripes_count;
public CrumbleEffect() {
}
public void get_fps(out int desired_fps, out int min_fps) {
desired_fps = CrumbleEffect.DESIRED_FPS;
min_fps = CrumbleEffect.MIN_FPS;
}
public bool needs_clear_background() {
return true;
}
public void start(Transitions.Visuals visuals, Transitions.Motion motion) {
Rand rand = new Rand();
// Cut original image into stripes of STRIPE_WIDTH width; also prepare
// acceleration for each stripe.
if (visuals.from_pixbuf != null) {
stripes_count = visuals.from_pixbuf.width / STRIPE_WIDTH;
from_stripes = new Cairo.ImageSurface[stripes_count];
accelerations = new double[stripes_count];
for (int i = 0; i < stripes_count; ++i) {
from_stripes[i] = new Cairo.ImageSurface(Cairo.Format.RGB24, STRIPE_WIDTH,
visuals.from_pixbuf.height);
Cairo.Context ctx = new Cairo.Context(from_stripes[i]);
Gdk.cairo_set_source_pixbuf(ctx, visuals.from_pixbuf, - i * STRIPE_WIDTH, 0);
ctx.paint();
accelerations[i] = rand.next_double();
}
}
}
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 (alpha < 0.5) {
// First part: draw stripes that go down with pre-calculated acceleration
alpha = alpha * 2; // stretch alpha to [0, 1]
// tear down from_pixbuf first
for (int i = 0; i < stripes_count; ++i) {
int x = visuals.from_pos.x + i * STRIPE_WIDTH;
double a = alpha + alpha * accelerations[i];
int y = visuals.from_pos.y + (int) (visuals.from_pixbuf.height * a * a);
ctx.set_source_surface(from_stripes[i], x, y);
ctx.paint();
}
} else if (visuals.to_pixbuf != null) {
// Second part: fade in next image ("to_pixbuf")
alpha = (alpha - 0.5) * 2; // stretch alpha to [0, 1]
Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf, visuals.to_pos.x, visuals.to_pos.y);
ctx.paint_with_alpha(alpha);
} else {
// TODO: fade in background color
}
}
public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
}
public void cancel() {
}
}
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