NetNews Usenet Archive 1992 #19/NN_1992_19.iso/spool/comp/windows/x/15844

Text File | 1992-08-29 | 1.6 KB | 46 lines

Newsgroups: comp.windows.x
Path: sparky!uunet!cs.utexas.edu!convex!seas.smu.edu!rrb
From: [e-mail] (Robert R. Bailey)
Subject: Xview and XGetImage problem
Message-ID: <[e-mail]>
Sender: [e-mail] (USENET News System)
Nntp-Posting-Host: star0.seas.smu.edu
Organization: School of Engineering and applied science; S.M.U.; Dallas, Tx
Date: Sat, 29 Aug 1992 02:35:05 GMT
Lines: 34

I am working with a 7-bit gray scale image and an overlay of several colors
using XView on a Sun SPARC.  After displaying the image and generating the
overlay, I can't seem to read the resulting image back so that I can write
it out to a rasterfile.

The following is a summary of how I display the image:
  dsply = (Display *) xv_get( canvas, XV_DISPLAY);
  win = (Drawable) xv_get( canvas_point_window( canvas), XV_XID);
  set color map;
  xi = XCreateImage( dsply, default_visual, 8, ZPixmap, 0, data,
    width, height, 8, width);
  XPutImage( dsply, win, gc, xi, 0,0,0,0, width, height);

Now, I draw on top of the image:
  XDrawLine( dsply, win, gc, x,y,x,y);
  etc.;

I can scroll around and draw some more.
Now I want to take the resulting modified image and write it to a rasterfile.
(If I can get it to an XImage, I can to it.)  I tried:
  new_xi = XGetImage( dsply, win, 0,0, width,height, AllPlanes, ZPixmap);

But this does not work.  I can only get that part of the image that is
currently displayed in the window, which is smaller than the whole
(1024 X 1024) image.

How do I get the whole image?

Thanks for any suggestions.

Bob Bailey
[e-mail]
--
From: Bob Bailey = [e-mail]