kicad-developers team mailing list archive

[Wayne Stambaugh <stambaughw@xxxxxxxxx>]

I'm surprised other osx users have not complained about this before now.
 Is it possible that this is due a particular version of wxWidgets
and/or osx and only Bernhard is seeing this?

On 2/8/2016 9:34 AM, Maciej Sumiński wrote:
> Redrawing has to be done with every mouse movement (at least to redraw
> the cursor), so to avoid issuing too frequent paint events, the timer
> limits the number of requests per second.
> 
> I cannot really tell why there is such discrepancy in wxTimer behavior
> depending on the platform. Was this the case since the beginning? If
> not, was it introduced in a particular wxWidgets or OS X version?
> 
> Regards,
> ORson
> 
> On 02/08/2016 03:08 PM, Wayne Stambaugh wrote:
>> I wonder if the throttling is done by wxWidgets, do we even need to
>> throttle on windows and linux?  Would one of our gal devs please comment
>> on why this is necessary?  Is this patch good to go on OSX?
>>
>> On 2/6/2016 10:25 AM, Bernhard Stegmaier wrote:
>>> Hi,
>>>
>>> attached a patch to disable the below mentioned FPS limitation on OS X.
>>>
>>> Without limitation/timer scrolling is smooth as expected.
>>> Even with heaviest scrolling or other use-cases I tested I did not
>>> observe any increased CPU load.
>>>
>>> At least, from a user perspective possibly drawing too often seems way
>>> better than having nasty hangs due to the excessive timer latency.
>>>
>>>
>>> Regards,
>>> Bernhard
>>>
>>>
>>>
>>>
>>>> On 31.01.2016, at 16:45, Bernhard Stegmaier <stegmaier@xxxxxxxxxxxxx
>>>> <mailto:stegmaier@xxxxxxxxxxxxx>> wrote:
>>>>
>>>> Hi all,
>>>>
>>>> I was looking why panning in GAL canvas on OS X is sometimes very jerky.
>>>>
>>>> I found out that GAL implements a framerate limiting using a timer,
>>>> which blocks further updates if you try to refresh with >60Hz.
>>>> With a Mac touchpad you easily get scroll events >60Hz, so that hits
>>>> quite often.
>>>>
>>>> Problem is, that the timer event to unblock again at least on my
>>>> MacBook often needs between 200ms and 500ms instead of the max. 17ms
>>>> it should have. If this happens, you get “hangs” while panning.
>>>>
>>>> I tried to throttle mouse events to <60Hz to avoid hitting the timer.
>>>> Unfortunately, this doesn’t seem to be enough, because
>>>> EDA_DRAW_PANEL_GAL::Refresh still seems to be called very frequently
>>>> (<<17ms, often with a delta of 0ms or 1ms). So, timer still kicks in
>>>> and blocks things more than needed.
>>>> I also did notice that EDA_DRAW_PANEL_GAL::Refresh is called on every
>>>> mouse move (with default system mouse cursor)… is that also intended?
>>>> For updating status bar?
>>>>
>>>> Any ideas on either how to improve the timer or how not to make it
>>>> kick in?
>>>>
>>>> I already did try to use the wxTimer::Notify() function instead of
>>>> having a wxTimerEvent delivered, but that didn’t make any big difference.
>>>> I didn’t investigate the timer implementation of wxWidgets on OS X,
>>>> maybe the latency already is there before any wxWidget event handling.
>>>>
>>>> Or, wouldn’t it be more appropriate to use something like the vertical
>>>> sync 
>>>>   https://www.opengl.org/wiki/Swap_Interval
>>>> to limit drawing instead of this timer?
>>>>
>>>>
>>>> Regards,
>>>> Bernhard
>>>>
>>>>
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>>>
>>>
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>>
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> 
>