1 files changed, 70 insertions, 0 deletions
diff --git a/plugins/shotwell-transitions/FadeEffect.vala b/plugins/shotwell-transitions/FadeEffect.vala
new file mode 100644
index 0000000..efe1d74
--- /dev/null
+++ b/plugins/shotwell-transitions/FadeEffect.vala
@@ -0,0 +1,70 @@
+/* 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() {
+    }
+}
+