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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 BlindsEffectDescriptor : ShotwellTransitionDescriptor {
public BlindsEffectDescriptor() {
base();
}
public override unowned string get_id() {
return "org.gnome.shotwell.transitions.blinds";
}
public override unowned string get_pluggable_name() {
return _("Blinds");
}
public override Transitions.Effect create(HostInterface host) {
return new BlindsEffect();
}
}
private class BlindsEffect : Object, Transitions.Effect {
private const int DESIRED_FPS = 30;
private const int MIN_FPS = 15;
private const int BLIND_WIDTH = 50;
private int current_blind_width;
private Cairo.ImageSurface[] to_blinds;
private int blind_count;
public BlindsEffect() {
}
public void get_fps(out int desired_fps, out int min_fps) {
desired_fps = BlindsEffect.DESIRED_FPS;
min_fps = BlindsEffect.MIN_FPS;
}
public bool needs_clear_background() {
return true;
}
public void start(Transitions.Visuals visuals, Transitions.Motion motion) {
if (visuals.from_pixbuf != null) {
blind_count = visuals.to_pixbuf.width / BLIND_WIDTH;
current_blind_width =
(int) Math.ceil((double) visuals.to_pixbuf.width / (double) blind_count);
to_blinds = new Cairo.ImageSurface[blind_count];
for (int i = 0; i < blind_count; ++i) {
to_blinds[i] = new Cairo.ImageSurface(Cairo.Format.RGB24, current_blind_width,
visuals.to_pixbuf.height);
Cairo.Context ctx = new Cairo.Context(to_blinds[i]);
Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf, -i * current_blind_width, 0);
ctx.paint();
}
}
}
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);
int y = visuals.to_pos.y;
int x = visuals.to_pos.x;
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 * 2);
}
for (int i = 0; i < blind_count; ++i) {
ctx.set_source_surface(to_blinds[i], x + i * current_blind_width, y);
ctx.rectangle(x + i * current_blind_width, y, current_blind_width * (alpha + 0.5),
visuals.to_pixbuf.height);
ctx.fill();
}
ctx.clip();
ctx.paint();
}
public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
}
public void cancel() {
}
}
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