[Bug 36504] The XFORM matrix is calculated incorrectly in PlgBlt()

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=36504

--- Comment #1 from Sebastian Lackner <sebastian at fds-team.de> ---
@Other readers: I have analyzed the differences between the old and the new set
of equations, you can find some more details here on the mailing list:
http://www.winehq.org/pipermail/wine-devel/2014-June/104518.html

Most likely fixing the equation for eM22 should be sufficient, no need to
rewrite the whole function:

xf.eM22 = (rect[1].x*(plg[2].y - plg[0].y) - rect[2].x*(plg[1].y - plg[0].y) -
rect[0].x*(plg[2].y - plg[1].y)) / det;

@Alexander: Can you confirm that this single change resolves the issue? If yes
I would suggest you to send a new patch, which really only modifies this part.
I don't think you'll need to write a test for this single-line change, where
most likely everyone can agree, that it looks like a mistake in the old code.
The main problem of your huge patch was just, that noone could really follow,
what has changed exactly.

Regards,
Sebastian

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