[Qt-interest] Subtraction from huge QPolygonF

[Natan Abolafya]

So,I have these huge polygonFs with thousands of points,and there are lots
of small polygons that needs to be subtracted from those huge polygons.
I use subtracted(QPolygonF) method but it takes too much time(sometimes 2-3
seconds each depending enormity of the huge polygon) and I do this a lot in
my code(big loops).
Is there any way to do this faster?

Thanks.
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