[Bug 51139] Application T at X 2021 freezes when trying to transmit data to Elster (German Tax Application)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51139

--- Comment #12 from Henri Verbeet <hverbeet at gmail.com> ---
(In reply to ms from comment #9)
> in d2d_geometry_resolve_beziers() the innermost of 3 while loops never
> terminates, because there's a point that has x and y both NaN.
> 
> the NaN was created in d2d_geometry_add_bezier_line_intersections() because
> "t" is NaN because it's created by dividing 0 by 0.
> 
> unfortunately am rather clueless about graphics, so have only found a
> workaround "if (isnan(t)) {return TRUE;}" that prevents the crash, the
> resulting images are obviously wrong as most of the text is missing.

Does it also help if you replace "if (isnan(t)) return TRUE;" with "if
(isnan(t)) t = 0.0f;"?

In any case, from the log it looks like the reason we end up with "t" being NaN
is that we have a degenerate (i.e., zero-length) line segment that intersects
the curve segment. It would be good to figure out what kind of geometry
reproduces that, so that we can add a test case for it.

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