Strange drawing limits

Bert Freudenberg bert at
Sun Oct 15 10:54:12 UTC 2006

Am 15.10.2006 um 11:57 schrieb Lukas Renggli:

> Hi,
> I published a couple of bugs related to limits painting on Forms:
> To summarize: Drawing on forms does not work for x-coordinates bigger
> than 2047, things get clipped. There seems to be a similar limit for
> Display, that is at 4094. I couldn't observe such a limit on
> y-coordinates, except for FormCanvas>>initialize that sets quite a
> small clipping rectangle but it can be changed easily.
> Anybody knowing where this limit for x-coordinates is coming from? Is
> it in the VM? Is it in the code somewhere?
> The limit on x-coordinates seems to me very low and makes Squeak
> basically useless if you want to use it on bigger screens (multi
> screen setup) or if you want to produce big graphics.

I produced larger forms. Like, a 9600x7200x32 bit form downscaled to  
a 4800x3600 antialiased image for printing:

This means both bitblt and warpblt handle this just fine, as does the  
JPEG writer.

The resulting image is linked to at the end of the article, but  
beware, your browser may or may not like to display an image of that  
size ;-)

- Bert -

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