How to calculate rendring time of Qpixmzp or graphicsview

[moh.gup@gmail.com]

Hi,
Please suggest me How to calculate rendring time of Qpixmzp or graphicsview.
Is any library present in Qt for calclating the same.

Thanks

[SixDegrees]

Pretty much impossible to do this by algorithm. The number of variables - CPU and graphics card characteristics, system memory, which operating system, which underlying graphics library, system load and many others - is too large and varied.

You can easily time some test images yourself with various timer functions, or insert a timer within a program that accumulates estimates as it runs on a given system that will, over time, converge on a reasonably accurate estimate, but even that will always be an approximation at best.

[moh.gup@gmail.com]

Hi,
Thanks for reply.
IS there any other way to measure perfomance of moudle. in term of sapce time complexicity.
Is any such library given in Qt ?

Thanks

[MarekR22]

QTestLib has QBENCHMARK. See example here. But in case of painting performance you have to find alternative way or workarounds (paint event of widgets is synchronized with refresh rate of screen).
Once I did this kind of test by putting in graphics view lots of objects of one kind and animating some of them (I measured nr of paint event calls in 4 second period, nr of object was so big so frames per second were smaller then refresh rate of screen so I have warranty that I measure performance of my painting not screen refresh rate).