Path: utzoo!attcan!uunet!seismo!sundc!pitstop!texsun!sun-barr!rutgers!apple!bloom-beacon!EXPO.LCS.MIT.EDU!rws
From: rws@EXPO.LCS.MIT.EDU
Newsgroups: comp.windows.x
Subject: Re: Bitmap Image/XPutImage Question
Message-ID: <8904281203.AA02465@expire.lcs.mit.edu>
Date: 28 Apr 89 12:03:04 GMT
References: <3033@hound.UUCP>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 16


    XImage *image;
    image=XCreateImage( dpy, visual, 1, XYBitmap, 0, (char *)the_bitmapbits,
			width, height, 8, (width/8) );

You want (width + 7) / 8.  But also, this call will set bitmap attributes
based on the display rather than based on the source image.  This is a
defect in the Xlib interface; you'll want to smash values in the image
after you create it.

    XPutImage( dpy, mywin, gc, image, 0,0, 50,50, width, height );
    XMapWindow( dpy, mywin );

You can't expect to put graphics into an unmapped window, and then map it,
and expect the graphics to appear.  Do not pass Go, return to your favorite
X book's explanation of mapping/exposure/redraw mechanics.