Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!bu-cs!madd
From: madd@bu-cs.BU.EDU (Jim Frost)
Newsgroups: comp.windows.x
Subject: Re: Help with Drawing Pixmaps using Xlib
Message-ID: <39467@bu-cs.BU.EDU>
Date: 4 Oct 89 15:46:00 GMT
References: <31687@ucbvax.BERKELEY.EDU> <8910041226.AA05387@expire.lcs.mit.edu>
Reply-To: madd@cs.bu.edu (Jim Frost)
Followup-To: comp.windows.x
Organization: Software Tool & Die
Lines: 21

In article <8910041226.AA05387@expire.lcs.mit.edu> rws@EXPO.LCS.MIT.EDU (Bob Scheifler) writes:

|If you're going 1-bit to 1-bit, just use
|XCopyArea.  If you're going 1-bit to N-bit, just use XCopyPlane.

Use XCopyPlane always so you don't have to worry about the depth of
the other pixmap.  This is what I use when sending bitmap images to
both mono and color displays; allocate a mono pixmap, XPutImage to it,
then XCopyPlane with GC foreground and background set to recolor the
image appropriately.  This is a bit slower to mono displays (you don't
really need the extra copy) but is a lot more flexible.

Now for a question: what do the GC foreground and background
specifiers do on an XPutImage command?  What I really hoped was that I
could use them to specify colors when transferring a mono image to a
color display, but the destination must be the same depth (ie 1) so
I'm kind of confused as to what they do.

jim frost
software tool & die
madd@std.com