Applying this patch, recompiling, and running on linux with the
MONO_XSYNC environment variable set will (along with slowing down
rendering immensely) flash the regions on the screen that a control will
be repainting.
It's useful in some cases to see where we're repainting more than we
should be (the datagrid is a good example), and cases where we're just
repainting everything too much (the toolbar is a good example).
Chris
Index: System.Windows.Forms/Control.cs
===================================================================
--- System.Windows.Forms/Control.cs (revision 62842)
+++ System.Windows.Forms/Control.cs (working copy)
@@ -1,3 +1,4 @@
+//#define DEBUG_INVALIDATE
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
@@ -3829,6 +3830,16 @@
return;
}
+ for (int i = 0; i < 3; i ++) {
+ paint_event.Graphics.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (Color.Red),
+ paint_event.ClipRectangle);
+ Thread.Sleep (10);
+ paint_event.Graphics.FillRectangle (ThemeEngine.Current.ResPool.GetSolidBrush (Color.White),
+ paint_event.ClipRectangle);
+ Thread.Sleep (10);
+ }
+
+
if (!needs_redraw) {
// Just blit the previous image
paint_event.Graphics.DrawImage (ImageBuffer, paint_event.ClipRectangle, paint_event.ClipRectangle, GraphicsUnit.Pixel);
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