Morphic slowness, was: Re: The Puzzle Page
bert at isg.cs.uni-magdeburg.de
Tue Dec 19 10:10:59 UTC 2000
On Tue, 19 Dec 2000, Henrik Gedenryd wrote:
> It seems the Morphic strategy is this: bottom-up [...]
> A more optimal technique is: top-down [...]
> Any thoughts from the graphics mavens?
I don't even know what a maven is ;)
Okay, I looked it up. I'm not sure I fit this category. But anyway, here
Morphic actually uses a top-down redraw strategy. It's soemwhat hidden,
though. Check out WorldState>>drawWorld:submorphs:invalidAreasOn: (it used
to be PasteUpMorph>>drawInvalidAreasOn: but Bob shuffles methods around
faster than you can look ;^)
This is the reason why every partly transparent morph should correctly
implement #areasRemainingToFill: .
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