Re: black Box

Tue, 17 Jan 1995 13:23:33 -0500

>>> Would Someone tell me what the little outline box or frame around the
>>>video window means and why it keeps blinking on and off.
>>The black border means that CU-SeeMe is using the general Mac toolbox
>>routine, CopyBits, to update the video window, which it does whenever the
>>video must be cropped (i.e., when the window is not fully exposed).
>>Otherwise, CU-SeeMe will draw directly to the screen, which is must faster.
>> The black border is drawn to alert you to the performance penalty, which
>>may or may not be significant depending on how many windows you have open,
>>how often they are being updated, how fast your machine is etc. You can
>>get rid of the border by moving your video window or whatever is obscuring
>> In the version 0.80, soon to be released, the borders are not so
>>obtrusive (half the width) and also there is a preferences item which
>>allows you to always use CopyBits, which is necessary for proper operation
>>in some circumstances. In that case, the borders are omitted.
>But that is the part I don't understand. My windows are always fully
>exposed. I am running the software in the foreground and I tile the
>active windows on the reflector across my screen. They are not covered or
>cropped. It always runs with the black boxes, all the time. Even when I
>direct connect to someone I get them . Machine speed should not be a
>factor as I am running this on a 7100 AV. Network speed is direct ethernet
>connection to the net with a 56kb line and I am running the PPC native
>version of the code.
>Anything else I should check?

Okay, I guess my explanation was not complete. The black border is drawn
whenever CU-SeeMe concludes that it cannot draw directly to the screen.
The most likely reason for this to happen is if the video is not fully
visible, as described above. Other reasons that CU-SeeMe may conclude that
it can't draw direct are:
1) The monitor is set to something less than 4-bits/pixel
2) The monitor is set to exactly 4-bits/pixel, but the choices are
something other than 16 grays.
3) The window spans multiple devices

Does 1 or 2 fit your situation? Another possibility is that there is
something about your system configuration that is confusing CU-SeeMe's
decision-making process. E.g., if you had some kind of init or system
extension that modified the Window Manager's behavior, it might make
CU-SeeMe think the windows were obscured.

Tim Dorcey
Sr. Programmer/Analyst (607) 255-5715
Advanced Technologies & Planning
CIT Network Resources
Cornell University
Ithaca, NY 14850