1 files changed, 96 insertions, 0 deletions
diff --git a/plugins/shotwell-transitions/BlindsEffect.vala b/plugins/shotwell-transitions/BlindsEffect.vala
new file mode 100644
index 0000000..6fdcf18
--- /dev/null
+++ b/plugins/shotwell-transitions/BlindsEffect.vala
@@ -0,0 +1,96 @@
+/* Copyright 2013 Jens Bav
+ * 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 BlindsEffectDescriptor : ShotwellTransitionDescriptor {
+    public BlindsEffectDescriptor(GLib.File resource_directory) {
+        base(resource_directory);
+    }
+
+    public override unowned string get_id() {
+        return "org.yorba.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() {
+    }
+}