[Bug 58314] GetGlyphOutlineW returns a negative number sometimes

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58314

Nikolay Sivov  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Nikolay Sivov  ---
The sample program is asking for a glyph for 0xaf (macron) that does not exist
in the font. Linked font is used instead, Tahoma in this case.

Next in freetype_get_glyph_outline() in metrics fixup:

---
         metrics.horiBearingY = top;
         metrics.height = top - bottom;
---

things go wrong and resulting box gets inverted yMin and yMax. This produces
negative height later and negative "needed" buffer size.

I don't have time right now to look deeper at what's happening with this
metrics adjustment, but that's the problem I think. I don't know if it's a
general fixup issue or is caused by a linked font and metrics are mixed up
somewhere between the fonts.