Path: utzoo!attcan!uunet!nih-csl!lhc!mimsy!haven!udel!wuarchive!zaphod.mps.ohio-state.edu!swrinde!ucsd!ucbvax!bloom-beacon!LARRY.MCRCIM.MCGILL.EDU!mouse
From: mouse@LARRY.MCRCIM.MCGILL.EDU
Newsgroups: comp.windows.x
Subject: Re:  Can some one help me with Image package
Message-ID: <9010201237.AA05400@Larry.McRCIM.McGill.EDU>
Date: 20 Oct 90 12:37:44 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 22

> I want to acess pixel information of an image and manipulate them for
> writing Image processing routines.  I dont want to use XPutpixel etc
> as that slows down the whole thing, is there any way I can assign a
> arry containing the pixel values to the data of the image.

> what I am looking for is something like assigning memory pixrect in
> Sunview.  (i.e) equivalent for
> 	mpr_d(mem)->md_image =(short *) buf;
> where buf is an array containing the pixel values and mem is a memory
> pixrect.

XCreateImage takes a pointer to the data as one of its arguments.
Unfortunately there is no clean way (as far as I can tell) to get an
XImage with bit and byte sex set the way *you* want them instead of the
way *the server* wants them.  It works, in my experience, to just bash
the values in the structure after creating it, but this is hardly a
proper solution.

					der Mouse

			old: mcgill-vision!mouse
			new: mouse@larry.mcrcim.mcgill.edu