| From: | Patrick Roberts |
| Date: | 13 Aug 2000 at 01:20:52 |
| Subject: | Re: AMIOPEN: pixmap stride |
Ahhhhh... cool- thanks L)
-Pat
Rick Jones wrote:
>
> ----- Original Message ----- From: Patrick Roberts
>
> > Can anyone tell me what application having a pixmap stride (as in the
> > ave/avo/##bit/open) different than Xdimention*sizeof(pixel) has?
>
> Sometimes this is used to "align" each horizontal row of pixels to some
> natural memory alignment so as to simplify certain raster operations.
> If you don't do the alignment some "words", "cache lines" or whatever
> contain data for pixels at the end of one line plus data for the start of
> the next line and software must handle this essentially one pixel at a
> time whereas an algorithim exists (and wide enough registers) to do
> multiple pixels in parallel.
>
> Rick Jones
>
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