@Taron
if you are interested I have a lence effect in my link below that looks just like yours but should be somewhat faster. It works directly with pixmap manipulation so I don't know if you can find any use for it. Look under effects. Warning: the code is really ugly.
if you are interested I have a lence effect in my link below that looks just like yours but should be somewhat faster. It works directly with pixmap manipulation so I don't know if you can find any use for it. Look under effects. Warning: the code is really ugly.