1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/* 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 FadeEffectDescriptor : ShotwellTransitionDescriptor {
public FadeEffectDescriptor(GLib.File resource_directory) {
base(resource_directory);
}
public override unowned string get_id() {
return "org.yorba.shotwell.transitions.fade";
}
public override unowned string get_pluggable_name() {
return _("Fade");
}
public override Transitions.Effect create(Spit.HostInterface host) {
return new FadeEffect();
}
}
private class FadeEffect : Object, Transitions.Effect {
private const int DESIRED_FPS = 30;
private const int MIN_FPS = 20;
public FadeEffect() {
}
public void get_fps(out int desired_fps, out int min_fps) {
desired_fps = FadeEffect.DESIRED_FPS;
min_fps = FadeEffect.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);
// blend the two pixbufs using an alpha of the appropriate level depending on how far
// the cycle has progressed
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(1.0 - alpha);
}
if (visuals.to_pixbuf != null) {
Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf, visuals.to_pos.x, visuals.to_pos.y);
ctx.paint_with_alpha(alpha);
}
}
public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
}
public void cancel() {
}
}
|
