Dear people,
i started correcting the dt problem with masks borders displayed at a wrong 
position.

There is a detail i don't understand and currently dont't know how to do.

Lets assume i have a point p(x,y), x and y are both in the 0->1 range covering 
the whole
raw data (no lensfun applied).

So my question: 
How can i calculate the position (also 0->1 range for both) **after** lensfun 
correction?

Any help or suggestions are appreciated a lot!



P.S. I looked at src/develop/masks/circle.c, added some fprintf#s to show what 
values i pass to
and have after dt_dev_distort_backtransform(darktable.develop, pts, 1) in 
function
dt_circle_events_button_released. I understand the parameters but the resulting 
data in pts
are a mystery for me.






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