[Lazarus] Animation library

[José Mejuto]

El 27/02/2017 a las 15:15, Graeme Geldenhuys via Lazarus escribió:

> The sample program runs and all animations (except "Alpha bend this
> form" functionality) works. Two points though:

Hello,

I don't know of the alpha blend form is possible in Linux and using you 
windows manager.

>
> 1) The FPS counter in the form title doesn't seem to function. Instead
>    of a FPS counter it seems to simply be a counter that constantly
>    grows.

Hmmm... I must review it, in Windows works but maybe in Linux (not using 
getperformancecounter) it simply goes crazy.

> 2) I have a 4 core system with hyper threading (ie: 4 cores and 4
>    virtual cores). Your sample application maxed out all 8 cores at
>    100% CPU load. Not really acceptable behaviour for a desktop
>    application I would think. ;-)

The library animate controls properties, like position and color at the 
rate set by the "tmrAnimationCadence" timer. Maybe Linux LCL takes ages 
to update control positions or the backend widgetset. The CPU use for 
the library operations are almost 0% but repaint the form is CPU 
intensive specially in Linux, based in your observations. There is no 
reason that more than one core is used (no threading) so the widgetset 
or LCL interface is pushing it to its limits.

You can try to remove the "Self.Refresh" in the tmrAnimationCadence 
event and also raise the tmrAnimationCadence.Interval to 30 (in the 
published code its value is 1, but it should be 15, but in Windows 
difference between 15 and 1 is zero, in Linux you can set timers with 1 
ms. precision which is terrible overkill).

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