[winex11] fix regression caused by client-side DIB copy patch

Damjan Jovanovic damjan.jov at gmail.com
Tue Nov 7 12:59:31 CST 2006

My recently committed client-side DIB copy patch misdetects bottom-up
DIBs, causing a regression in Reason 3.0 (graphical glitches). This
patch fixes it.

The problem was that a BITMAP's height is always positive, it is the
BITMAPINFOHEADER's height that is negative in the case of a bottom-up

  * Fixed a bug that caused misdetection of bottom-up DIBs in the
client-side DIB copy case.

Damjan Jovanovic
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