public void QueueDirtyRegion (Gdk.Rectangle region)
{
region.Intersect (Allocation);
QueueDrawArea (region.X, region.Y, region.Width, region.Height);
}
public unsafe static void ExponentialBlur (this DockySurface self, int radius, Gdk.Rectangle area)
{
if (radius < 1)
return;
area.Intersect (new Gdk.Rectangle (0, 0, self.Width, self.Height));
int alpha = (int) ((1 << AlphaPrecision) * (1.0 - Math.Exp (-2.3 / (radius + 1.0))));
int height = self.Height;
int width = self.Width;
ImageSurface original;
bool owned;
if (self.Internal is ImageSurface) {
original = self.Internal as ImageSurface;
owned = true;
} else {
original = new ImageSurface (Format.Argb32, width, height);
owned = false;
}
if (!owned) {
using (Cairo.Context cr = new Cairo.Context (original)) {
cr.Operator = Operator.Source;
cr.SetSource (self.Internal);
cr.Paint ();
(cr.Target as IDisposable).Dispose ();
}
}
byte* pixels = (byte*) original.DataPtr;
// Process Rows
Thread th = new Thread ((ThreadStart) delegate {
ExponentialBlurRows (pixels, width, height, 0, height / 2, area.X, area.Right, alpha);
});
th.Start ();
ExponentialBlurRows (pixels, width, height, height / 2, height, area.X, area.Right, alpha);
th.Join ();
// Process Columns
th = new Thread ((ThreadStart) delegate {
ExponentialBlurColumns (pixels, width, height, 0, width / 2, area.Y, area.Bottom, alpha);
});
th.Start ();
ExponentialBlurColumns (pixels, width, height, width / 2, width, area.Y, area.Bottom, alpha);
th.Join ();
original.MarkDirty ();
if (!owned) {
self.Context.Operator = Operator.Source;
self.Context.SetSource (original);
self.Context.Paint ();
self.Context.Operator = Operator.Over;
(original as IDisposable).Dispose ();
original.Destroy ();
}
}