[Tile-dev] Re: [MACTCL] Re: tile patch

[Joe E. <jen...@fl...>]

Jim Ingham wrote:
>
> Have you played around with whether the double buffering is
> necessary?  The Aqua Tk code does this sometimes, but that is more
> legacy and lack of time to see what we could rip out.  Mac OS X
> already double buffers all drawing, so if you are also drawing into a
> pixmap, everything ends up getting drawn three times.


Experiments show that this is still necessary on X11
and Windows to avoid "blinking".  We can get by without
it OK on X11 on really fast displays, but on older 
hardware and remote $DISPLAYs it's still helpful.
Haven't tried on OSX though; it's worth a shot.

Note that there might be coordinate system issues --
all of the aquaTheme element *Draw routines assume
that the point (0,0) in QuickDraw coordinates corresponds 
to the top left corner of the widget after caling
"SetGWorld(TkMacOSXGetDrawablePort(d), 0);".  
If the Drawable d is the Tk_WindowId of the widget 
instead of an off-screen pixmap, that won't be the 
case anymore.


--Joe English

  jen...@fl...