XFORM matrix and rotation bug

[Alexander Almaleh]

While working on the previous bug with PlgBlt(), I noticed there is another
one with the XFORM matrix.

I've submitted a bug report at https://bugs.winehq.org/show_bug.cgi?id=36815
.

I want to try to debug it and find a solution, but I need some help.

Can someone tell me where the code is where the XFORM matrix is used to
transform the coordinates? I mean where the actual blitting is done. Also,
how is it done? Does wine use an internal buffer and all the operations are
made manually, or does it just translate the blitting operations to the X
server?
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