Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cwjcc!tut.cis.ohio-state.edu!ucbvax!CAEN.ENGIN.UMICH.EDU!pha
From: pha@CAEN.ENGIN.UMICH.EDU (Paul H. Anderson)
Newsgroups: comp.sys.apollo
Subject: Re: GPR, turn on one pixel, big pictures
Message-ID: <41a5dda8e.001285f@caen.engin.umich.edu>
Date: 23 Feb 89 16:44:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 19

Another dumb GPR question... well, maybe not so dumb, but it
keeps coming up in my code, and I haven't found a good solution:

Is there an extremely fast, efficient way of converting a pixel
major bitmap to a plane major bitmap and vice versa?  ie many
printer type devices want things an 8 bit pixel at a time, but
are stored a plane at a time.  The best I've been able to do
is to do a gpr_$read/write_pixels, which gives me a pixel per
4 byte array element.  I do this only on one row or column at
a time (a column is much slower than a row), since to convert
a plane bitmap to a pixel bitmap via this call is beyond the
given limit of 128K pixels (this last info from my memory).

I don't recall exactly how fast I can do it, but it is something
on the order of a minute or two.  Is there a faster way of
doing this?

Paul Anderson
CAEN Apollo guy