How to draw soft shadow with QPainter?

[wysota]

Try the attached example (it works for backgroundless pixmaps as well and with little effort it should work for semi-transparent ones too). Use right and left mouse button to switch between different drawing modes.

If you want to change the way the shadow looks, adjust the filter.

[wysota]

Here is an improved version. Optimised and working correctly for full alpha channeled images.

[yogeshgokul]

This is very very slow.

[aamer4yu]

There was some shadows example on Trolltech labs(Graphics/Dojo)
You can find it here

[yogeshgokul]

Thank you for concern.

This example is rendering SVGs. But I want image files to be rendered with shadow. The old one, provided by Wysota, is doing same but that is too slow to be used.

[spud]

Well, you could optimize it. But firstly is it really too slow? Try drawing the shadow into a separate pixmap in the beginning and then just render it in the paintEvent(instead of generating it every time).
If that's still too slow for you, there are multiple ways of optimizing the function.

[yogeshgokul]

Thank you mate, this is very good example,
I gonna use it.