[Bug 12044] Garry's mod crashes upon player death caused by prop.

http://bugs.winehq.org/show_bug.cgi?id=12044

--- Comment #41 from Sam Edwards  2012-02-26 19:11:33 CST ---
Upgraded to 1.4-rc5, bug still happens, but I've figured out what's going on.

Source likes to render its font glyphs into textures. The function causing the
crash is designed to render a font into an RGBA buffer, which the caller uses
to turn into a texture. To figure out what Y-coordinate to start rendering
into, Source uses (lptm->tmAscent - lpgm->gmptGlyphOrigin.y). As long as
gmptGlyphOrigin.y is not greater than tmAscent, this will be a non-negative
number, and it will start copying into the buffer at a valid Y position.

In the case of the toilets, the gmptGlyphOrigin.y is 45, while the tmAscent for
its font is 43, which results in Source attempting to copy into its texture
buffer at -2: an out-of-bounds range.

This means that the problem is either with Wine's reporting of the text metrics
or the glyph origin, since it should not be giving an origin with a greater Y
than the ascent. I haven't tested this on Windows, so I don't know which
function is returning an incorrect value, but if I were to guess I'd say it's
the GetTextMetrics call.

At any rate, a WARN should probably be added to GetGlyphOutline when this
occurs, so that we can see if this is the same as bug 7698.