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Article #4625

Re: Novice C question

#4625
From: Leonard Norrgard
Date: Mon, 30 Jul 1990 21:45
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>	I want to draw about 2000 pixels in a window. Since these points may
>	be located arbitrarily anywhere in the window, the easiest way to do
>	this is to use WritePixel(). But as I understand the RKMs, each
>	WritePixel() occurs only after 1/60 sec., which means 2000 pixels
>	takes 2000/60 = 33 secs? This doesn't seem right, but I do know 
>	that WritePixel() takes longer than I would like. Is there a faster



>	way to do this, short of writing directly to BitMap memory?

  Ummm. WritePixel() shouldn't wait for anything except blits to
complete before it modifies the RastPort. This is slow enough however,
if you want to do it a number of thousand times. In addition
WritePixel() must obey clipping regions, which slows the process even
more as it clips each pixel separately (of course, it doesn't have a
choise).
  A better way would be to draw the pixels in a non-displayed
RastPort, but using your own variant of WritePixel(). Then call
ClipBlit() to copy your RastPort to a window RastPort(). Thus, you
will clip only once and writing a pixel doesn't need to wait for blits
to complete.

-- Leonard
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From: vinsci@soft.fi (Leonard Norrgard)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Novice C question
Message-ID: <VINSCI.90Jul30234542@funic.soft.fi>
Date: 30 Jul 90 21:45:42 GMT
References: <1237000012@uxa.cso.uiuc.edu>
Sender: vinsci@nic.funet.fi (Leonard Norrgard)
Organization: Soft Service, Inc.
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In-Reply-To: ragg0270@uxa.cso.uiuc.edu's message of 30 Jul 90 13:50:00 GMT