jmm@LAGUNA.JPL.NASA.GOV (Jan Martin) (08/16/90)
A request for help: I am using OpenWindows(X11) on a SparcStation 1+ and I'd like to display a 512x512 picture with 8-bit pixel values, but I can't find any X function which will do the trick. Setting the color map is easy, but how do you display a row or region of pixels which is stored as, say, a char array? It seems like using either an image or pixmap would be required, but the documentation on the formats is unclear -- if XYPixmap really requires separating all the bits out into bitplanes, that seems rather cumbersome and inefficient. Perhaps this is a trivial question with an obvious answer. If so, please excuse my ignorance--any help would be gratefully received. Thanks, Jan Martin Jet Propulsion Lab
mouse@LARRY.MCRCIM.MCGILL.EDU (08/29/90)
> I am using OpenWindows(X11) on a SparcStation 1+ and I'd like to > display a 512x512 picture with 8-bit pixel values, but I can't find > any X function which will do the trick. Setting the color map is > easy, but how do you display a row or region of pixels which is > stored as, say, a char array? It seems like using either an image or > pixmap would be required, but the documentation on the formats is > unclear -- if XYPixmap really requires separating all the bits out > into bitplanes, that seems rather cumbersome and inefficient. Right; that's what ZPixmap format is for. I would suggest creating an XImage structure pointing to your data and using XPutImage (either directly to a window or to a pixmap which you then XCopyArea to the window - trading speed for server-side memory). der Mouse old: mcgill-vision!mouse new: mouse@larry.mcrcim.mcgill.edu
jimf@SABER.COM (08/29/90)
> I am using OpenWindows(X11) on a SparcStation 1+ and I'd like to > display a 512x512 picture with 8-bit pixel values, but I can't find > any X function which will do the trick. Code to do this from an arbitrary-depth image to an arbitrary-depth display (except TrueColor and DirectColor visuals) can be had from send.c in xloadimage 1.06, available by anonymous ftp from expo.lcs.mit.edu in /contrib/xloadimage.1.06.tar.Z. This code works fine under OpenWindows. Happy hacking, jim frost saber software jimf@saber.com
raveling@unify.com (Paul Raveling) (08/31/90)
In article <9008291521.AA14077@armory>, jimf@SABER.COM writes: > > I am using OpenWindows(X11) on a SparcStation 1+ and I'd like to > > display a 512x512 picture with 8-bit pixel values, but I can't find > > any X function which will do the trick. > > Code to do this ... can be had from > send.c in xloadimage 1.06, ... Since shifting to a (yuch) monochrome SPARCstation 1 I've ironed out a couple minor bugs in the Img Software Set that sabotaged it on monochrome Suns. I'm now displaying assorted 1-deep, 8-deep, and 24-deep images in glorious black & white. Resolution sucks due to color getting compressed to gray scale, then dithered, but so be it. Having 1 plane is a hardware problem. Would there be enough interest in this copy to warrant trying to make it available? We don't have ftp access. ------------------ Paul Raveling Raveling@unify.com P.S.: My wish list for R5 is: Simplicity.