The XFORM matrix in PlgBlt is calculated incorrectly
bunglehead at gmail.com
Tue Dec 8 11:08:37 CST 2009
Alexander Almaleh wrote:
> I'm talking about this code,
> from http://source.winehq.org/source/dlls/gdi32/bitblt.c, in function
> PlgBlt :
> I have a formula that so far seems to give always the correct matrix:
> xf.eM11 = (FLOAT)
Hi, Alexander. This was my patch.
Feel free to correct this sending patch for review to
wine-patches at winehq.org
P.S. I don't see your point on inlining determinant expression.
> I found out about the bug by converting the rect points using the
> XFORM matrix, and checking that their the same as the plg points.
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