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- Path: sparky!uunet!munnari.oz.au!comp.vuw.ac.nz!actrix!templar!jbickers
- From: jbickers@templar.actrix.gen.nz (John Bickers)
- Newsgroups: comp.sys.amiga.programmer
- Subject: Re: Chunky Pixels vs. Bitplanes (was: Chunky Chip Set...)
- References: <1992Dec30.115759.22097@mpifr-bonn.mpg.de> <doiron.0ka3@starpt.UUCP>
- <1992Dec31.011428.2926@mpifr-bonn.mpg.de> <C03uC5.15o@unix.portal.com>
- <1992Dec31.174137.10865@mpifr-bonn.mpg.de>
- Message-ID: <jbickers.0mdl@templar.actrix.gen.nz>
- Date: 1 Jan 93 17:15:04 PST
- Organization: TAP
- Lines: 33
-
- Quoted from <1992Dec31.174137.10865@mpifr-bonn.mpg.de> by mlelstv@speckled.mpifr-bonn.mpg.de (Michael van Elst):
-
- > I am talking about a single blitter architecture. The simple point that
- > you need less memory for less bitplanes makes an operation faster.
-
- So do you concede that 8-bit chunky pixels are indeed faster than
- 8-bit planar pixels for CPU-driven drawing operations?
-
- > >No, it can rarely exactly compensate. The bitplane version of the algorithm
- > >will require the use of more temporary data, slowing it down. The best
- > >case is almost-as-fast.
- >
- > Why would it need more data ?
-
- Can you present your algorithm for bitmap scaling that performs as
- well as a chunky-pixel based algorithm?
-
- > >Except silly little things like drawing lines. Who'd ever want to draw a line? :-)
- >
- > And who fill an area by writing single pixels ?
-
- Me. A digital dissolve is basically filling an area by writing
- single pixels.
-
- > Fortunately, line drawing usually has to handle less data (you won't try to
- > fill the screen with vertical lines..).
-
- Horizontal wipes do indeed fill the screen with vertical lines.
-
- > Michael van Elst
- --
- *** John Bickers, TAP. jbickers@templar.actrix.gen.nz ***
- *** "Radioactivity - It's in the air, for you and me" - Kraftwerk ***
-