[Bug 57306] Multiple programs crash due to memory corruption since 5924ab4c515 (Nikon NX studio, Profit, Falcosoft's Soundfont Midi Player, IBExpert)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57306

--- Comment #12 from Rafał Mużyło  ---
The way I see it, generate_ellipse_top_half is just badly commented - it seem
to make some implicit assumptions about its inputs, but doesn't seem to state
those assumptions anywhere.

The algorithm is likely correct is all but 'points[pos++] = pt;' line, that is
it never states what size it expects that array to be - well, the original
algorithm likely just drawn a point at that point, instead of storing it.