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000195_nobody_Mon Aug 30 02:30:06 1999.msg
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From: "Sasu Lintula" <samali@utu.fi>
To: <amos-list@onelist.com>
Date: Mon, 30 Aug 1999 09:33:32 +0300
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Subject: [amos-list] Re: Transparent Screen Copying
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From: "Sasu Lintula" <samali@utu.fi>
Hi,
>On 28-Aug-99, Andrew Crowe wrote:
>> Although, I was thinking, couldn't we use the blitter to cut the mask out
>>of the destination screen? I would've thought the blitter'd be good at doing
>>that kind of bitplane stuff?
>Yes.
>But coding the blitter directly from withit AMOS is for some reason very
>unstable (tried that, but some random blits will be done wrong).
>And if you use AMOS' built in commandos to do it, you have to do some ugly
>poking around in the screen base.
>Well.
>Been there, done that :)
>I assume that Leek(Screen Base)=Logbase(0).
>If that in some future AMOS will not be the case, then the program will
>certainly crash. Use on your own risk.
>On '060 it is actually a bit slower than the old program, but as all work is
>done by the blitter then the speed should be the same on every Amiga. I guess
>the new program will be faster on everything else than '060.
>Replaced TMPBNK with TMPSCR.
Haven't you all got AMCAF? There's a command for masked screen copy operations, I think...
It should be fast enough:)
Sasu Lintula
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