nanogui: Re: pixmaps and XOR not working]
Subject:
Re: [nanogui] pixmaps and XOR not working]
From:
Jim Ham ####@####.####
Date:
13 May 2010 00:44:53 -0000
Message-Id: <4BEB4B8E.80502@porcine.com>
I have successfully ported my app from X Windows to nano-X. There are
still a couple of issues, the most important is the GR_MODE_XOR doesn't
seem to work with GrCopyArea(...). It seems to use GR_MODE_COPY
instead.
Here is the chunk of code that does the XOR.
if ((Chart.OldPosition != NewPosition) || (oldpxm != newpxm ) ) {
GrSetGCMode( gc, GR_MODE_XOR ) ;
GrCopyArea( win, gc, Chart.OldPosition, DIAMONDYSTART+BORDER,
29, 37, \
*oldpxm, 0, 0, GR_FALSE ) ;
GrCopyArea( win, gc, NewPosition, DIAMONDYSTART+BORDER, 29, 37, \
*newpxm, 0, 0, GR_FALSE ) ;
GrSetGCMode( gc, GR_MODE_COPY ) ;
Chart.OldPosition = NewPosition ;
oldpxm = newpxm ;
}
There is one other place in the code that uses GrCopyArea() and XOR, and
it shows the same behavior. Different pixmaps, but the result is the
same - GR_MODE_COPY apparently.
The pixmaps that contain the sprite seem to be OK - I see the sprite in
the right place with the colors that would be correct if XORed. This is
different behavior than when I was using the X translation library where
all I saw on the screen was a horizontal black line at the top of the
area where the sprite should have been.
Maybe I can help fix this if you give me a couple of clues on where to
look.
Regards,
Jim Ham
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