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Re: Strangeness with ScrollRect and QDFlushPortBuffer

On 20/05/2003 00:31, Haroon Sheikh <email@hidden> wrote:

>> On Friday, May 16, 2003, at 12:42 AM, Larry Gerndt wrote:
>>
>>> Now here's the strangeness: When the window is located near the top
>>> of the
>>> screen, the slide is seen to be nice and zippy. But if I move the
>>> window
>>> close to the bottom of the screen, it is much slower. In fact, there
>>> is a
>>> continuum: the closer the window is to the bottom of the screen, the
>>> slower
>>> the slide effect is.
>
> Eric's correct. All flushes are beam synced. Different graphics drivers
> have different implementation of the beamsync functionality. e.g. flush
> when beam is not in region of update, flush when beam is below region
> of update or even vbl sync'ing. The second is very likely going to
> cause slow downs as you move closer to the bottom of the screen.

Do you know any workaround to fix slowdown?

Mike
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