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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 ChessEffectDescriptor : ShotwellTransitionDescriptor {
public ChessEffectDescriptor() {
base();
}
public override unowned string get_id() {
return "org.gnome.shotwell.transitions.chess";
}
public override unowned string get_pluggable_name() {
return _("Chess");
}
public override Transitions.Effect create(HostInterface host) {
return new ChessEffect();
}
}
private class ChessEffect : Object, Transitions.Effect {
private const int DESIRED_FPS = 25;
private const int MIN_FPS = 10;
private const int SQUARE_SIZE = 100;
private double square_count_x;
private double square_count_y;
public ChessEffect() {
}
public void get_fps(out int desired_fps, out int min_fps) {
desired_fps = ChessEffect.DESIRED_FPS;
min_fps = ChessEffect.MIN_FPS;
}
public void start(Transitions.Visuals visuals, Transitions.Motion motion) {
square_count_y = visuals.to_pos.height / SQUARE_SIZE + 2;
square_count_x = visuals.to_pos.width / SQUARE_SIZE + 2;
}
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);
double size = 2 * alpha * SQUARE_SIZE;
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 - alpha);
}
if (visuals.to_pixbuf != null) {
Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf,visuals.to_pos.x, visuals.to_pos.y);
for (double y = 0; y <= square_count_y; y++) {
for (double x = 0; x <= square_count_x; x++) {
double translation = (x+y) % 2 == 0 ? -1.5 * SQUARE_SIZE : 1.5 * SQUARE_SIZE;
if (motion.direction == Transitions.Direction.FORWARD) {
ctx.rectangle(visuals.to_pos.x + translation + x * SQUARE_SIZE,
visuals.to_pos.y + y * SQUARE_SIZE, size, SQUARE_SIZE);
} else {
ctx.rectangle(visuals.to_pos.x + visuals.to_pos.width + translation - x
* SQUARE_SIZE - size, visuals.to_pos.y + y * SQUARE_SIZE, size,
SQUARE_SIZE);
}
}
}
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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