nanogui: Shaky display
Subject:
Re: [nanogui] Shaky display
From:
"Greg Haerr" ####@####.####
Date:
12 Jun 2008 15:46:45 -0000
Message-Id: <047a01c8cca3$ad04fd20$6401a8c0@winXP>
This looks like an interlaced scan issue or something like that...
Could it be you need to draw the screen memory only during certain
times, e.g. when the screen is not physically refreshing?
Perhaps you need to wait for a vertical sync?
Regards,
Greg
----- Original Message -----
From: Misbahullah Khan
To: Greg Haerr
Cc: ####@####.#### ; ####@####.#### ; Sanjeev GT
Sent: Wednesday, June 11, 2008 6:33 AM
Subject: Re: [nanogui] Shaky display
Hi Greg ,
To give you a better idea of the exact display issue, i am enclosing the snapshot of the display.
>I assume
>you are running a straight framebuffer driver. If not,
>then there are additional drawing issues.
We have not enabled the framebuffer driver in the kernel.The screen driver in the
microwindow directly calls the lcd driver and also we are statically building the
nano-X lib.
As you have mentioned there could be some other drawing issue we would like to
know that.
Thanks & Regards,
Misbah
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"Greg Haerr" ####@####.####
06/11/2008 05:03 AM Please respond to
"Greg Haerr" ####@####.####
To "Misbahullah Khan" ####@####.####
cc ####@####.####
Subject Re: [nanogui] Shaky display
: 1. It happens to be sometimes (1 in 20-30 times) that whenever i try to
: wtite a text to lcd display or fill a bar the text is written horizontaly
: about some percentage (say 50 %) and then again writes the same text the
: remaining percentage makeing the display as if one text is written twice
: half and half one over the other .
:
: Similarly when we are dispalying the a horizontal bar the bar gers
: displayed two times one over the other horizontaly.
I'm still confused as to whether you're describing a hardware
jitter or suggesting that perhaps the software is drawing
multiple times to appear "jittery." I don't think there
are any known bugs regarding the latter. I assume
you are running a straight framebuffer driver. If not,
then there are additional drawing issues.
: Is there any thing we could see into the microwindow ???
:
: Please do share your experience and knowledge regarding this concern .
Carlo's response regarding the OS framebuffer driver sounds
like something that can definitely be related to visual strangeness.
Notice this also applies to a system where there isn't really
a memory-mapped framebuffer, but some other mechanism
for drawing.
Regards,
Greg
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