13 files changed, 953 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() {
+    }
+}
diff --git a/plugins/shotwell-transitions/ChessEffect.vala b/plugins/shotwell-transitions/ChessEffect.vala
new file mode 100644
index 0000000..37c9fd2
--- /dev/null
+++ b/plugins/shotwell-transitions/ChessEffect.vala
@@ -0,0 +1,88 @@
+/* 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 ChessEffectDescriptor : ShotwellTransitionDescriptor {
+    public ChessEffectDescriptor(GLib.File resource_directory) {
+        base(resource_directory);
+    }
+
+    public override unowned string get_id() {
+        return "org.yorba.shotwell.transitions.chess";
+    }
+
+    public override unowned string get_pluggable_name() {
+        return _("Chess");
+    }
+
+    public override Transitions.Effect create(HostInterface host) {
+        return new ChessEffect();
+    }
+}
+
+private class ChessEffect : Object, Transitions.Effect {
+    private const int DESIRED_FPS = 25;
+    private const int MIN_FPS = 10;
+    private const int SQUARE_SIZE = 100;
+    private double square_count_x;
+    private double square_count_y;
+
+    public ChessEffect() {
+    }
+
+    public void get_fps(out int desired_fps, out int min_fps) {
+        desired_fps = ChessEffect.DESIRED_FPS;
+        min_fps = ChessEffect.MIN_FPS;
+    }
+
+    public void start(Transitions.Visuals visuals, Transitions.Motion motion) {
+      square_count_y = visuals.to_pos.height / SQUARE_SIZE + 2;
+      square_count_x = visuals.to_pos.width / SQUARE_SIZE + 2;
+    }
+
+    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);
+        double size = 2 * alpha * SQUARE_SIZE;
+        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);
+        }
+        
+        if (visuals.to_pixbuf != null) {
+            Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf,visuals.to_pos.x, visuals.to_pos.y);
+            for (double y = 0; y <= square_count_y; y++) {
+                for (double x = 0; x <= square_count_x; x++) {
+                    double translation = (x+y) % 2 == 0 ? -1.5 * SQUARE_SIZE : 1.5 * SQUARE_SIZE;
+                    if (motion.direction == Transitions.Direction.FORWARD) {
+                        ctx.rectangle(visuals.to_pos.x + translation + x * SQUARE_SIZE,
+                        visuals.to_pos.y + y * SQUARE_SIZE, size, SQUARE_SIZE);
+                    } else {
+                        ctx.rectangle(visuals.to_pos.x + visuals.to_pos.width + translation - x
+                            * SQUARE_SIZE - size, visuals.to_pos.y + y * SQUARE_SIZE, size,
+                            SQUARE_SIZE);
+                    }
+                }
+            }
+
+            ctx.clip();
+            ctx.paint_with_alpha(alpha);
+        }
+    }
+
+    public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
+    }
+
+    public void cancel() {
+    }
+}
diff --git a/plugins/shotwell-transitions/CircleEffect.vala b/plugins/shotwell-transitions/CircleEffect.vala
new file mode 100644
index 0000000..11e7631
--- /dev/null
+++ b/plugins/shotwell-transitions/CircleEffect.vala
@@ -0,0 +1,71 @@
+/* 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 CircleEffectDescriptor : ShotwellTransitionDescriptor {
+    public CircleEffectDescriptor(GLib.File resource_directory) {
+        base(resource_directory);
+    }
+
+    public override unowned string get_id() {
+        return "org.yorba.shotwell.transitions.circle";
+    }
+
+    public override unowned string get_pluggable_name() {
+        return _("Circle");
+    }
+
+    public override Transitions.Effect create(HostInterface host) {
+        return new CircleEffect();
+    }
+}
+
+private class CircleEffect : Object, Transitions.Effect {
+    private const int DESIRED_FPS = 25;
+    private const int MIN_FPS = 15;
+
+    public CircleEffect() {
+    }
+
+    public void get_fps(out int desired_fps, out int min_fps) {
+        desired_fps = CircleEffect.DESIRED_FPS;
+        min_fps = CircleEffect.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);
+        int radius = (int)((alpha) * Math.fmax(width,height));
+        
+        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);
+        }
+        
+        if (visuals.to_pixbuf != null) {
+            Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf,visuals.to_pos.x, visuals.to_pos.y);
+            ctx.arc ((int) width / 2, (int) height / 2, radius, 0, 2 * Math.PI);
+            ctx.clip();
+            ctx.paint();
+        }
+    }
+
+    public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
+    }
+
+    public void cancel() {
+    }
+}
diff --git a/plugins/shotwell-transitions/CirclesEffect.vala b/plugins/shotwell-transitions/CirclesEffect.vala
new file mode 100644
index 0000000..b01e06f
--- /dev/null
+++ b/plugins/shotwell-transitions/CirclesEffect.vala
@@ -0,0 +1,86 @@
+/* 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 CirclesEffectDescriptor : ShotwellTransitionDescriptor {
+    public CirclesEffectDescriptor(GLib.File resource_directory) {
+        base(resource_directory);
+    }
+
+    public override unowned string get_id() {
+        return "org.yorba.shotwell.transitions.circles";
+    }
+
+    public override unowned string get_pluggable_name() {
+        return _("Circles");
+    }
+
+    public override Transitions.Effect create(HostInterface host) {
+        return new CirclesEffect();
+    }
+}
+
+private class CirclesEffect : Object, Transitions.Effect {
+    private const int DESIRED_FPS = 25;
+    private const int MIN_FPS = 15;
+    private const double SPEED = 2.5;
+
+    public CirclesEffect() {
+    }
+
+    public void get_fps(out int desired_fps, out int min_fps) {
+        desired_fps = CirclesEffect.DESIRED_FPS;
+        min_fps = CirclesEffect.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);
+        int distance = 60, radius;
+        int circleCountX = width / (2 * distance);
+        int circleCountY = height / distance;
+        double maxRadius = SPEED * distance;
+        
+        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);
+        }
+        
+        if (visuals.to_pixbuf != null) {
+            Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf,visuals.to_pos.x, visuals.to_pos.y);
+            
+            for(int y = 0; y <= circleCountY; y++){
+                for(int x = 0; x <= circleCountX; x++){
+                    radius = (int) (Math.fmax(0,Math.fmin(1, alpha-((double) (x + y)/(double)
+                        ((circleCountY + circleCountX) * SPEED)))) * maxRadius);
+                    ctx.arc(2 * distance * x, 2 * distance * y, radius, 0, 2 * Math.PI);
+                    ctx.fill();
+                }
+            }
+            
+            ctx.clip();
+            ctx.paint_with_alpha(alpha);
+        }
+
+
+    }
+
+    public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
+    }
+
+    public void cancel() {
+    }
+}
diff --git a/plugins/shotwell-transitions/ClockEffect.vala b/plugins/shotwell-transitions/ClockEffect.vala
new file mode 100644
index 0000000..78b39a6
--- /dev/null
+++ b/plugins/shotwell-transitions/ClockEffect.vala
@@ -0,0 +1,83 @@
+/* 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 ClockEffectDescriptor : ShotwellTransitionDescriptor {
+    public ClockEffectDescriptor(GLib.File resource_directory) {
+        base(resource_directory);
+    }
+
+    public override unowned string get_id() {
+        return "org.yorba.shotwell.transitions.clock";
+    }
+
+    public override unowned string get_pluggable_name() {
+        return _("Clock");
+    }
+
+    public override Transitions.Effect create(HostInterface host) {
+        return new ClockEffect();
+    }
+}
+
+private class ClockEffect : Object, Transitions.Effect {
+    private const int DESIRED_FPS = 25;
+    private const int MIN_FPS = 15;
+    private const double TOP_RADIANT = 0.5 * Math.PI;
+
+    public ClockEffect() {
+    }
+
+    public void get_fps(out int desired_fps, out int min_fps) {
+        desired_fps = ClockEffect.DESIRED_FPS;
+        min_fps = ClockEffect.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);
+        double start_angle = -TOP_RADIANT, stop_angle = -TOP_RADIANT;
+        
+        if (motion.direction == Transitions.Direction.FORWARD)
+            stop_angle = alpha*Math.PI * 2 - TOP_RADIANT;
+        else
+            start_angle = (2 * (1-alpha)) * Math.PI - TOP_RADIANT;
+
+        int radius = (int) Math.fmax(visuals.to_pos.width, visuals.to_pos.height);
+
+        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);
+        }
+        
+        if (visuals.to_pixbuf != null) {
+            Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf,visuals.to_pos.x, visuals.to_pos.y);
+
+            int x = visuals.to_pos.x + (int) visuals.to_pos.width / 2;
+            int y = visuals.to_pos.y + (int) visuals.to_pos.height / 2;
+
+            ctx.move_to(x, y);
+            ctx.arc (x, y, radius, start_angle, stop_angle);
+            ctx.fill_preserve();
+        }
+    }
+
+    public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
+    }
+
+    public void cancel() {
+    }
+}
diff --git a/plugins/shotwell-transitions/CrumbleEffect.vala b/plugins/shotwell-transitions/CrumbleEffect.vala
new file mode 100644
index 0000000..a458811
--- /dev/null
+++ b/plugins/shotwell-transitions/CrumbleEffect.vala
@@ -0,0 +1,103 @@
+/* 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 CrumbleEffectDescriptor : ShotwellTransitionDescriptor {
+    public CrumbleEffectDescriptor(GLib.File resource_directory) {
+        base(resource_directory);
+    }
+
+    public override unowned string get_id() {
+        return "org.yorba.shotwell.transitions.crumble";
+    }
+    
+    public override unowned string get_pluggable_name() {
+        return _("Crumble");
+    }
+    
+    public override Transitions.Effect create(Spit.HostInterface host) {
+        return new CrumbleEffect();
+    }
+}
+
+private class CrumbleEffect : Object, Transitions.Effect {
+    private const int DESIRED_FPS = 25;
+    private const int MIN_FPS = 15;
+    
+    private const int STRIPE_WIDTH = 10;
+    
+    private Cairo.ImageSurface[] from_stripes;
+    private double[] accelerations;
+    private int stripes_count;
+    
+    public CrumbleEffect() {
+    }
+    
+    public void get_fps(out int desired_fps, out int min_fps) {
+        desired_fps = CrumbleEffect.DESIRED_FPS;
+        min_fps = CrumbleEffect.MIN_FPS;
+    }
+    
+    public bool needs_clear_background() {
+        return true;
+    }
+    
+    public void start(Transitions.Visuals visuals, Transitions.Motion motion) {
+        Rand rand = new Rand();
+        
+        // Cut original image into stripes of STRIPE_WIDTH width; also prepare
+        // acceleration for each stripe.
+        if (visuals.from_pixbuf != null) {
+            stripes_count = visuals.from_pixbuf.width / STRIPE_WIDTH;
+            from_stripes = new Cairo.ImageSurface[stripes_count];
+            accelerations = new double[stripes_count];
+            for (int i = 0; i < stripes_count; ++i) {
+                from_stripes[i] = new Cairo.ImageSurface(Cairo.Format.RGB24, STRIPE_WIDTH,
+                    visuals.from_pixbuf.height);
+                Cairo.Context ctx = new Cairo.Context(from_stripes[i]);
+                Gdk.cairo_set_source_pixbuf(ctx, visuals.from_pixbuf, - i * STRIPE_WIDTH, 0);
+                ctx.paint();
+                accelerations[i] = rand.next_double();
+            }
+        }
+    }
+    
+    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);
+        
+        if (alpha < 0.5) {
+            // First part: draw stripes that go down with pre-calculated acceleration
+            alpha = alpha * 2; // stretch alpha to [0, 1]
+            
+            // tear down from_pixbuf first 
+            for (int i = 0; i < stripes_count; ++i) {
+                int x = visuals.from_pos.x + i * STRIPE_WIDTH;
+                double a = alpha + alpha * accelerations[i];
+                int y = visuals.from_pos.y + (int) (visuals.from_pixbuf.height * a * a);
+                
+                ctx.set_source_surface(from_stripes[i], x, y);
+                ctx.paint();
+            }
+        } else if (visuals.to_pixbuf != null) {
+            // Second part: fade in next image ("to_pixbuf")
+            alpha = (alpha - 0.5) * 2; // stretch alpha to [0, 1]
+            Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf, visuals.to_pos.x, visuals.to_pos.y);
+            ctx.paint_with_alpha(alpha);
+        } else {
+            // TODO: fade in background color
+        }
+    }
+    
+    public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
+    }
+    
+    public void cancel() {
+    }
+}
+
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() {
+    }
+}
+
diff --git a/plugins/shotwell-transitions/Makefile b/plugins/shotwell-transitions/Makefile
new file mode 100644
index 0000000..043891c
--- /dev/null
+++ b/plugins/shotwell-transitions/Makefile
@@ -0,0 +1,21 @@
+
+PLUGIN := shotwell-transitions
+
+SRC_FILES := \
+	shotwell-transitions.vala \
+	FadeEffect.vala \
+	SlideEffect.vala \
+	CrumbleEffect.vala \
+	BlindsEffect.vala \
+	CircleEffect.vala \
+	CirclesEffect.vala \
+	SquaresEffect.vala \
+	StripesEffect.vala \
+	ChessEffect.vala \
+	ClockEffect.vala
+
+RC_FILES := \
+	slideshow-plugin.png
+
+include ../Makefile.plugin.mk
+
diff --git a/plugins/shotwell-transitions/SlideEffect.vala b/plugins/shotwell-transitions/SlideEffect.vala
new file mode 100644
index 0000000..1019f62
--- /dev/null
+++ b/plugins/shotwell-transitions/SlideEffect.vala
@@ -0,0 +1,75 @@
+/* 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 SlideEffectDescriptor : ShotwellTransitionDescriptor {
+    public SlideEffectDescriptor(GLib.File resource_directory) {
+        base(resource_directory);
+    }
+
+    public override unowned string get_id() {
+        return "org.yorba.shotwell.transitions.slide";
+    }
+    
+    public override unowned string get_pluggable_name() {
+        return _("Slide");
+    }
+    
+    public override Transitions.Effect create(Spit.HostInterface host) {
+        return new SlideEffect();
+    }
+}
+
+private class SlideEffect : Object, Transitions.Effect {
+    private const int DESIRED_FPS = 25;
+    private const int MIN_FPS = 15;
+    
+    public SlideEffect() {
+    }
+    
+    public void get_fps(out int desired_fps, out int min_fps) {
+        desired_fps = SlideEffect.DESIRED_FPS;
+        min_fps = SlideEffect.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);
+        
+        if (visuals.from_pixbuf != null) {
+            int from_target_x = (motion.direction == Transitions.Direction.FORWARD) 
+                ? -visuals.from_pixbuf.width : width;
+            int from_current_x = (int) (visuals.from_pos.x * (1 - alpha) + from_target_x * alpha);
+            Gdk.cairo_set_source_pixbuf(ctx, visuals.from_pixbuf, from_current_x, visuals.from_pos.y);
+            ctx.paint();
+        }
+
+        if (visuals.to_pixbuf != null) {
+            int to_target_x = (width - visuals.to_pixbuf.width) / 2;
+            int from_x = (motion.direction == Transitions.Direction.FORWARD) 
+                ? width : -visuals.to_pixbuf.width;
+            int to_current_x = (int) (from_x * (1 - alpha) + to_target_x * alpha);
+            Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf, to_current_x, visuals.to_pos.y);
+            ctx.paint();
+        }
+    }
+    
+    public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
+    }
+    
+    public void cancel() {
+    }
+}
+
diff --git a/plugins/shotwell-transitions/SquaresEffect.vala b/plugins/shotwell-transitions/SquaresEffect.vala
new file mode 100644
index 0000000..c5a0163
--- /dev/null
+++ b/plugins/shotwell-transitions/SquaresEffect.vala
@@ -0,0 +1,86 @@
+/* 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 SquaresEffectDescriptor : ShotwellTransitionDescriptor {
+    public SquaresEffectDescriptor(GLib.File resource_directory) {
+        base(resource_directory);
+    }
+
+    public override unowned string get_id() {
+        return "org.yorba.shotwell.transitions.squares";
+    }
+
+    public override unowned string get_pluggable_name() {
+        return _("Squares");
+    }
+
+    public override Transitions.Effect create(HostInterface host) {
+        return new SquaresEffect();
+    }
+}
+
+private class SquaresEffect : Object, Transitions.Effect {
+    private const int DESIRED_FPS = 25;
+    private const int MIN_FPS = 10;
+    private const int SQUARE_SIZE = 100;
+    private double square_count_x;
+    private double square_count_y;
+
+    public SquaresEffect() {
+    }
+
+    public void get_fps(out int desired_fps, out int min_fps) {
+        desired_fps = SquaresEffect.DESIRED_FPS;
+        min_fps = SquaresEffect.MIN_FPS;
+    }
+
+    public void start(Transitions.Visuals visuals, Transitions.Motion motion) {
+      square_count_x = visuals.to_pos.width/SQUARE_SIZE + 1;
+      square_count_y = visuals.to_pos.height/SQUARE_SIZE + 1;
+    }
+
+    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);
+        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);
+        }
+        
+        if (visuals.to_pixbuf != null) {
+            Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf,visuals.to_pos.x, visuals.to_pos.y);
+            for (double y = 0; y<=square_count_y; y++) {
+                for (double x = 0; x <=square_count_x; x++) {
+                    double size = SQUARE_SIZE * (Math.fmin(1, alpha + ((square_count_x - x)
+                        / square_count_x + (square_count_y - y)/square_count_y)/2.5));
+
+                    ctx.rectangle(visuals.to_pos.x + x * SQUARE_SIZE, visuals.to_pos.y + y
+                        * SQUARE_SIZE, size, size);
+
+                    ctx.fill();
+                }
+            }
+            
+            ctx.clip();
+            ctx.paint_with_alpha(alpha);
+        }
+    }
+
+    public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
+    }
+
+    public void cancel() {
+    }
+}
+
diff --git a/plugins/shotwell-transitions/StripesEffect.vala b/plugins/shotwell-transitions/StripesEffect.vala
new file mode 100644
index 0000000..2edbdfe
--- /dev/null
+++ b/plugins/shotwell-transitions/StripesEffect.vala
@@ -0,0 +1,84 @@
+/* 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 StripesEffectDescriptor : ShotwellTransitionDescriptor {
+    public StripesEffectDescriptor(GLib.File resource_directory) {
+        base(resource_directory);
+    }
+
+    public override unowned string get_id() {
+        return "org.yorba.shotwell.transitions.stripes";
+    }
+
+    public override unowned string get_pluggable_name() {
+        return _("Stripes");
+    }
+
+    public override Transitions.Effect create(HostInterface host) {
+        return new StripesEffect();
+    }
+}
+
+private class StripesEffect : Object, Transitions.Effect {
+    private const int DESIRED_FPS = 25;
+    private const int MIN_FPS = 10;
+    private const int STRIPE_HEIGHT = 100;
+    private int stripe_count;
+
+    public StripesEffect() {
+    }
+
+    public void get_fps(out int desired_fps, out int min_fps) {
+        desired_fps = StripesEffect.DESIRED_FPS;
+        min_fps = StripesEffect.MIN_FPS;
+    }
+
+    public void start(Transitions.Visuals visuals, Transitions.Motion motion) {
+      stripe_count = visuals.to_pos.height / STRIPE_HEIGHT + 1;
+    }
+
+    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);
+        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 - Math.fmin(1, alpha * 2));
+        }
+        
+        if (visuals.to_pixbuf != null) {
+            Gdk.cairo_set_source_pixbuf(ctx, visuals.to_pixbuf,visuals.to_pos.x, visuals.to_pos.y);
+            int x = visuals.to_pos.x;
+            int y = visuals.to_pos.y;
+            for (int i = 0; i <= stripe_count; i++) {
+                if (i % 2 == motion.direction) {
+                    ctx.rectangle(x + visuals.to_pos.width - alpha * visuals.to_pos.width,
+                        y + i * STRIPE_HEIGHT, x + visuals.to_pos.width, STRIPE_HEIGHT);
+                } else {
+                    ctx.rectangle(x, y + STRIPE_HEIGHT * i, visuals.to_pos.width * alpha,
+                        STRIPE_HEIGHT);
+                }
+            }
+
+            ctx.clip();
+            ctx.paint_with_alpha(alpha);
+        }
+    }
+
+    public void advance(Transitions.Visuals visuals, Transitions.Motion motion, int frame_number) {
+    }
+
+    public void cancel() {
+    }
+}
+
diff --git a/plugins/shotwell-transitions/shotwell-transitions.vala b/plugins/shotwell-transitions/shotwell-transitions.vala
new file mode 100644
index 0000000..bd358c3
--- /dev/null
+++ b/plugins/shotwell-transitions/shotwell-transitions.vala
@@ -0,0 +1,90 @@
+/* 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.
+ */
+
+extern const string _VERSION;
+
+private class ShotwellTransitions : Object, Spit.Module {
+    private Spit.Pluggable[] pluggables = new Spit.Pluggable[0];
+
+    public ShotwellTransitions(GLib.File module_file) {
+        GLib.File resource_directory = module_file.get_parent();
+
+        pluggables += new FadeEffectDescriptor(resource_directory);
+        pluggables += new SlideEffectDescriptor(resource_directory);
+        pluggables += new CrumbleEffectDescriptor(resource_directory);
+        pluggables += new BlindsEffectDescriptor(resource_directory);
+        pluggables += new CircleEffectDescriptor(resource_directory);
+        pluggables += new CirclesEffectDescriptor(resource_directory);
+        pluggables += new ClockEffectDescriptor(resource_directory);
+        pluggables += new SquaresEffectDescriptor(resource_directory);
+        pluggables += new ChessEffectDescriptor(resource_directory);
+        pluggables += new StripesEffectDescriptor(resource_directory);
+    }
+    
+    public unowned string get_module_name() {
+        return _("Core Slideshow Transitions");
+    }
+    
+    public unowned string get_version() {
+        return _VERSION;
+    }
+    
+    public unowned string get_id() {
+        return "org.yorba.shotwell.transitions";
+    }
+    
+    public unowned Spit.Pluggable[]? get_pluggables() {
+        return pluggables;
+    }
+}
+
+// This entry point is required for all SPIT modules.
+public Spit.Module? spit_entry_point(Spit.EntryPointParams *params) {
+    params->module_spit_interface = Spit.negotiate_interfaces(params->host_min_spit_interface,
+        params->host_max_spit_interface, Spit.CURRENT_INTERFACE);
+    
+    return (params->module_spit_interface != Spit.UNSUPPORTED_INTERFACE)
+        ? new ShotwellTransitions(params->module_file) : null;
+}
+
+// Base class for all transition descriptors in this module
+public abstract class ShotwellTransitionDescriptor : Object, Spit.Pluggable, Spit.Transitions.Descriptor {
+    private const string ICON_FILENAME = "slideshow-plugin.png";
+
+    private static Gdk.Pixbuf[] icon_pixbuf_set = null;
+    
+    public ShotwellTransitionDescriptor(GLib.File resource_directory) {
+        if (icon_pixbuf_set == null)
+            icon_pixbuf_set = Resources.load_icon_set(resource_directory.get_child(ICON_FILENAME));
+    }
+
+    public int get_pluggable_interface(int min_host_interface, int max_host_interface) {
+        return Spit.negotiate_interfaces(min_host_interface, max_host_interface,
+            Spit.Transitions.CURRENT_INTERFACE);
+    }
+    
+    public abstract unowned string get_id();
+    
+    public abstract unowned string get_pluggable_name();
+    
+    public void get_info(ref Spit.PluggableInfo info) {
+        info.authors = "Maxim Kartashev";
+        info.copyright = _("Copyright 2010 Maxim Kartashev, Copyright 2011-2014 Yorba Foundation");
+        info.translators = Resources.TRANSLATORS;
+        info.version = _VERSION;
+        info.website_name = Resources.WEBSITE_NAME;
+        info.website_url = Resources.WEBSITE_URL;
+        info.is_license_wordwrapped = false;
+        info.license = Resources.LICENSE;
+        info.icons = icon_pixbuf_set;
+    }
+    
+    public void activation(bool enabled) {
+    }
+    
+    public abstract Spit.Transitions.Effect create(Spit.HostInterface host);
+}
+
diff --git a/plugins/shotwell-transitions/slideshow-plugin.png b/plugins/shotwell-transitions/slideshow-plugin.png
new file mode 100755
index 0000000..cb4a497
--- /dev/null
+++ b/plugins/shotwell-transitions/slideshow-plugin.png