BitBlt >> #pixelAt:put: speed
Marcel Weiher
marcel at metaobject.com
Wed May 3 21:07:54 UTC 2000
> From: "Lex Spoon" <lex at cc.gatech.edu>
>
> "Raab, Andreas" <Andreas.Raab at disney.com> wrote:
> > "Make us a canvas"
> > fc _ FormCanvas on: Display.
>
> Hrm. A general mechanism for getting a caching canvas for a given
> canvas would be nice. For instance, you might have an 8-bit display,
> but drawOn: might be given a PostscriptCanvas as an
argument--you'd like
> to cache in full color rather than 8-bit color (assuming Squeak's
> PostscriptCanvas handles color).
Yes, it does... :-) Anyway, it is of course even somewhat
questionable wether a Postscript canvas should even supply a
form-based cache at all, or even any cache. OTOH, sometimes you
really, really do want a form.
> It would be nice to have "aCanvas canvasForCaching: size".
I think I even implemented something like this in the experimetnal
DPS screen-display code, can't remember, though.
Marcel
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