Cursor position in pixels

[PT]

I plan to implement emacs support for a language and want to display  
suggestions for the user in a pop up frame. For example, the user starts  
to type the name of a function and if he hesitates a small frame appears  
in the screen above the line the cursor is in showing possible completions.

In order to position the popup frame correctly I need to know the position  
of the cursor in pixels relative to the top/left corner of the current  
Emacs frame. I couldn't find anything like that in the documentation. Is  
it possible?

Of course, I can show the completions in an other window in the same frame  
(pop-to-buffer), but a small temporary popup frame above the cursor would  
be nicer.

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