public static void FillRegion(this Context g, Gdk.Region region, Cairo.Color color)
{
g.Save ();
g.Color = color;
foreach (Gdk.Rectangle r in region.GetRectangles())
{
g.MoveTo (r.X, r.Y);
g.LineTo (r.X + r.Width, r.Y);
g.LineTo (r.X + r.Width, r.Y + r.Height);
g.LineTo (r.X, r.Y + r.Height);
g.LineTo (r.X, r.Y);
g.Color = color;
g.StrokeExtents ();
g.Fill ();
}
g.Restore ();
}
private static Gdk.Rectangle[] GetRectangles(Gdk.Region region)
{
#if true
return new Gdk.Rectangle [] { region.Clipbox };
#else
return region.GetRectangles ();
#endif
}
private void PreloadRegion (Gdk.Region region, int step)
{
Gdk.Rectangle [] rects = region.GetRectangles ();
if (step < 0)
System.Array.Reverse (rects);
foreach (Gdk.Rectangle preload in rects) {
Preload (preload, false);
}
}
private void RenderBackground(Gdk.Window window, Gdk.Region region)
{
rand = rand ?? new Random ();
if (circles == null) {
for (int i = 0, n = rand.Next (100, 150); i < n; i++) {
circles = circles ?? new Circle[n];
circles[i] = new Circle {
X = rand.Next (0, Screen.Width),
Y = rand.Next (0, Screen.Height),
R = rand.Next (10, 70),
A = rand.NextDouble () * 0.08
};
}
}
Cairo.Context cr = Gdk.CairoHelper.Create (window);
foreach (Gdk.Rectangle damage in region.GetRectangles ()) {
cr.Rectangle (damage.X, damage.Y, damage.Width, damage.Height);
cr.Clip ();
cr.Translate (Allocation.X, Allocation.Y);
cr.Rectangle (0, 0, Allocation.Width, Allocation.Height);
if (render_gradient) {
var grad = new Cairo.LinearGradient (0, 0, 0, Allocation.Height);
grad.AddColorStop (0.7, CairoExtensions.GdkColorToCairoColor (Style.Base (StateType.Normal)));
grad.AddColorStop (1, CairoExtensions.GdkColorToCairoColor (Style.Background (StateType.Normal)));
cr.Pattern = grad;
cr.Fill ();
grad.Destroy ();
foreach (var circle in circles) {
cr.Color = new Cairo.Color (0, 0, 0, circle.A);
cr.Arc (circle.X + circle.R, circle.Y + circle.R, circle.R, 0, 2 * Math.PI);
cr.Fill ();
}
} else {
cr.Color = new Cairo.Color (1, 1, 1);
cr.Fill ();
}
if (window_decorator != null) {
window_decorator.Render (cr);
}
if (render_debug) {
cr.LineWidth = 1.0;
cr.Color = CairoExtensions.RgbToColor (
(uint)rand.Next (0, 0xffffff));
cr.Rectangle (damage.X + 0.5, damage.Y + 0.5, damage.Width - 1, damage.Height - 1);
cr.Stroke ();
}
cr.ResetClip ();
}
CairoExtensions.DisposeContext (cr);
}
