[Bug 3902] Unnormal slowness in Heroes 4 (X11DRV_BitBlt?)
wine-bugs at winehq.org
Wed Nov 30 12:44:59 CST 2005
------- Additional Comments From kuba at mareimbrium.org 2005-30-11 12:44 -------
This looks like a reasonable optimization to me. Enlarging the rectangle is a
cheap operation, so it shouldn't slow things down. I'd start by doing it only
in the BitBlt.
Note that *all* image modifying GDI operations need to either invalidate
LastModRect or update it (union with current operation's rect), there's no
middle ground. Since invalidation is a matter of setting one coordinate of the
rectangle to some magic value, it's cheap too.
Then DoUpdateDIBSection looks whether the rectangle is valid, and if so only
copies the indicated part of the DIB around. Otherwise it reverts to current
behaviour. After it finishes, the rectangle needs to be set to a zero-sized
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