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From: envbvs@epb2.lbl.gov (Brian V. Smith)
Newsgroups: comp.windows.x
Subject: Re: Bitmap scaling in X
Keywords: X blit scale stretch bitmap pixmap
Message-ID: <1990Sep11.104510@epb2.lbl.gov>
Date: 11 Sep 90 17:45:10 GMT
References: <20200@well.sf.ca.us> <1990Sep11.100202@wsl.dec.com>
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Reply-To: envbvs@epb2.lbl.gov (Brian V. Smith)
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X-Local-Date: Tue, 11 Sep 90 10:49:47 PDT

In article <1990Sep11.100202@wsl.dec.com>, klee@wsl.dec.com (Ken Lee) writes:
|> In article <20200@well.sf.ca.us>, brent@well.sf.ca.us (Brent
Southard) writes:
|> |> Are there any functions in the X toolkit to provide for the
scaling of
|> |> bitmaps (pixmaps, actually, I suppose)?  If not, what are the
methods most
|> |> people are employing to quickly provide this capability over a
range of
|> |> hardware?
|> 
|> Most graphics extensions to X, such as Display PostScript and PEX,
have
|> facilities for image scaling.  If you want to do this by hand, most
|> books on computer graphics discuss something like "geometric
|> transformations of images".  The latest Foley & VanDam book has
|> pseudocode for some of the simpler algorithms.
|> 

Or check out the pbmplus programs, written by Jef Poskanser, which will
scale, rotate, clip etc. "portable bitmaps".  There are also many
support
programs to convert to/from various formats and pbm.
The pbm package is available from expo.lcs.mit.edu (18.30.0.212) in the
/contrib directory (pbmplus.tar.Z).

--
Brian V. Smith    (bvsmith@lbl.gov)
Lawrence Berkeley Laboratory
I don't speak for LBL; they don't pay me enough for that.