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authorJörg Frings-Fürst <debian@jff-webhosting.net>2014-07-23 09:06:59 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2014-07-23 09:06:59 +0200
commit4ea2cc3bd4a7d9b1c54a9d33e6a1cf82e7c8c21d (patch)
treed2e54377d14d604356c86862a326f64ae64dadd6 /plugins/shotwell-transitions/FadeEffect.vala
Imported Upstream version 0.18.1upstream/0.18.1
Diffstat (limited to 'plugins/shotwell-transitions/FadeEffect.vala')
-rw-r--r--plugins/shotwell-transitions/FadeEffect.vala70
1 files changed, 70 insertions, 0 deletions
diff --git a/plugins/shotwell-transitions/FadeEffect.vala b/plugins/shotwell-transitions/FadeEffect.vala
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+++ b/plugins/shotwell-transitions/FadeEffect.vala
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+/* Copyright 2010 Maxim Kartashev
+ * Copyright 2011-2014 Yorba Foundation
+ *
+ * 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() {
+ }
+}
+