Strange Bug in GtkText ... I think.

[Kevin Atkinson <kevinatk home com>]

I have been having trouble with my gaspell applit for quite some time
now but it got a lot worse when I updated to the October gnome release
which has gtk 1.2.6 in it.

I think it is a bug in the GtkText widget, but I am not sure.

What happens is that either, the wrong text is highlighted in red when
gaspell highlights the misspelled word, OR gaspell just crashes.

Here is how to reproduce the problem with the October gnome release.

1) Download and compile gaspell.
2) *Paste* the text at the end of the message in gaspell. (If you save
the text in a file and then open the problem disappears)
3) Click at the very beginning of the text
4) Click on start.
5) Ignore Hauppague
6) correct manuual
7) notice how "then W" is highlighted instead of "WinTV's"
8) If you keep on correcting gaspell may crash

Also

to make gaspell crash for sure just paste the first 2 or three
paragraphs in and start at step 3.

I have carefully debugged my code and can not seam to find anything that
I am doing wrong which leads me to believe that is is a Gtk+ bug. 
However, I am not a Gtk+ expect as this is my only Gtk+ programs I have
written.

So, I would *really* appreciate it if someone who knows Gtk+ well and a
little C++ could look at my gaspell program and tell me what the heck is
going on.  Ie.  is it me or Gtk+.  And, if it is Gtk+, how can I can
around the bug until it is fixed for good.

Thanks in advance.

Begin test text:

According to the Hauppague manuual:

Live TV can be displayed on your VGA screen by using either _Video
Overlay_ or the _Primary Surface_ mode.

... then WinTV's Video Digitizer "pushes" YUV 4:2:2 video pixels for
temporary storage into an off-screen part of the VGA meory called a
Secondary Surface.  This method is called Video Overlay.  The VGA
display adapter will then convert the video image from YUV 4:2:2 inbto
RGB video and continuosly overlay the VGA screen with the video image.
Using Video Overlay, the VGA controller treats the live TV image just
like any other window, which results in a 24-bit video image on your
VGA screen.  You will be able to display full screen TV at all VGA
resolutions.

... but does not have either a Video Port or enough memory to hold the
video image off-screen, then the WinTV board converts the YUV 4:2:2
video pixels into an RGB format which is compatible with you VGA
adaptor's operating mode (8 biuts per pixel, 16 bits per pixel, or
24-bits per pixel) and then moves the pixels direcly into the display
memory Primary Surface of your VGA.

This results in a high quality video image whose color depth is
dependent upon youe VGA display adapror'soperating mode.

Also becuase the video is moved direcyly onto the Primary Surface,
featurs such as close captiojning and full-screeen TV in resolutions
greather than 640x480 will be disabled.

Now by question is: Which mode does the Linux drivers use?  I suspect
it is Primarty Surface becuase I can not get video at resolutions
greather than 640x480.

Also, is the linux driver capable of cpaturing video at resolutions
greather than 640x480?  I release that the actual singal is no more
than roughly 640x480 but I would be really nice if I could capture
higer resolution images.  The reselting images are sligtly better than
capturing an image at 640x480 and then resizeing it using gimp or some
related tool.




-- 
Kevin Atkinson
kevinatk@home.com
http://metalab.unc.edu/kevina/