Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!bu-cs!madd
From: madd@bu-cs.BU.EDU (Jim Frost)
Newsgroups: comp.windows.x
Subject: Re: pixmap to disk
Message-ID: <40202@bu-cs.BU.EDU>
Date: 12 Oct 89 20:00:54 GMT
Reply-To: madd@cs.bu.edu (Jim Frost)
Organization: Software Tool & Die
Lines: 32

In article <4630@ncar.ucar.edu> clyne@ncar.ucar.edu (John Clyne) writes:
|Does anyone have a utility for dumping a pixmap to disk? i.e. the analogue
|to xwd for windows. We want to create to create super high resolution raster
|images (on the order of 3k x 3k) for our dicomed recorders. Any pointers
|would be much appreciated.

I don't have an actual utility but you can make one quickly (versus a
quick one) with XGetImage much as follows:

	ximage= XGetImage(disp, pixmap, 0, 0, pixmap_width,
	                  pixmap_height, AllPlanes, ZPixmap);

I prefer this ZPixmap over XYPixmap because it's a lot easier to
convert to native pixel values using it.  Once you have the image you
need only loop through the XImage data area (taking into account
whatever byte-order and padding the image has) and write it out in
your favorite format.

If you like I can write you one that dumps a colormap into a Sun
rasterfile (I have code for rasterfile manipulation hanging around)
which does the above function for a given pixmap and colormap.

Interested?  If so, email me at madd@cs.bu.edu.  For others doing
image work, I have an image display utility nearly complete which
reads several image formats and performs a variety of simple image
processing functions on them (particularly those needed to display
images on inferior displays).  I'd be happy to send it to interested
parties.

jim frost
software tool & die
madd@std.com