[squeak-dev] Double-buffering using Display and BitBlt

How do you do double-buffering using Display and BitBlt?

Is there a trick related to deferUpdates:? Or is it not really supported or supported using some other plug-in?

Gulik.

--

http://gulik.pbwiki.com/

Michael van der Gulik wrote:
> Is there a trick related to deferUpdates:? Or is it not really supported
> or supported using some other plug-in?

Yes, there is a trick. Compare these two:

1 to: 1000 do:[:i|
        Display getCanvas line: i@0 to: i@500 width: 1 color: Color black.
].

vs. (after doing a restore display):

Display deferUpdates: true.
1 to: 1000 do:[:i|
        Display getCanvas line: i@0 to: i@500 width: 1 color: Color black.
].
Display forceToScreen: Display boundingBox. "way too much but hey..."

Cheers,
   - Andreas

In other news, my image causes the VM to do a segmentation fault on startup. I'll work out if that's from stupidity or a legitimate bug tonight.

Gulik.

--
http://gulik.pbwiki.com/