| Title: | DECWINDOWS 26-JAN-89 to 29-NOV-90 |
| Notice: | See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit |
| Moderator: | STAR::VATNE |
| Created: | Mon Oct 30 1989 |
| Last Modified: | Mon Dec 31 1990 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3726 |
| Total number of notes: | 19516 |
Hi,
I'm trying to put an 8-bit deep image in an 8-bit deep pixmap on and
24-bit deep firefox. But, all I get is a BadMatch on XPutImage.
What I do is get the 8-bit deep PseudoColor visual. Using this visual I
create a private colormap. I create a window (child of root) of depth 8
with the PseudoColor visual, my private colormap, with border pixel and
background pixel defines as the WhitePixel. Then I create a pixmap
(XCreatePixmap), using my window as the drawable argument and a depth
of 8. Then I create a image (ZPixmap) of depth 8 using the PseudoColor
visual. I then use XPutImage into the pixmap, the GC being used is
supplied by XCreateGC and uses the default values.
The XPutImage generates a BadMatch, does anyone have any ideas or is
this a bug (if so I'll QAR).
Thanks,
Peter
P.S.
I can get the image displayed if I convert the image to 32-bits,
use the DirectColor visual at 24-bits, this works. But wastes a hell of
a lot of resources! The PMAX runs the same program about 10 times
faster.
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1420.1 | Ideas | DECWIN::FISHER | Burns Fisher 381-1466, ZKO3-4/W23 | Tue Sep 12 1989 11:24 | 20 |
A couple suggestions, not all of which address the current problem: 1. WhitePixel is only valid on the default colormap. Thus your background and border are undefined. Allocate a white out of your new colormap. (This does not cause a match problem; only a possible strange color); 2. Make sure you are creating the GC with the correct window. When you say "default values" I assume you are still using your new window, not the default window, right? 3. Use the debugger and look at the XImage structure. It may be getting initialized to something that is not appropriate for the non-default visual. I just looked at the structure, and could not see anything offhand, but I may have missed something. Hope this helps. If not, try experiments using the same gc to do something else (like a line) to the pixmap, and try XYPixmap, etc. Burns | |||||
| 1420.2 | GC was the problem... | GPSDCC::ZGRAGGEN | Searching for infinity... | Tue Sep 12 1989 13:51 | 9 |
Well, it is point 2 that solved the problem! The XImage struct has some
real funnies in it, but getting the GC on the RIGHT window (not the
root window) fixed the problems!
I'll buy you a beer if you're ever in Geneva!
Thanks,
Peter
| |||||
| 1420.3 | Beer in Geneva...what a deal! | DECWIN::FISHER | Burns Fisher 381-1466, ZKO3-4/W23 | Wed Sep 13 1989 12:49 | 6 |
Sounds like a good deal. There must be some good reason for me to go there. (Haven't been to Geneva since (gulp!) 1968 when I went on a high school student exchange thing! Burns | |||||