[Bug 421] Implement a DIB engine

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=421





------- Additional Comments From damjan.jov at gmail.com  2006-06-11 09:16 -------
Since this is the place for discussing DIB engine related stuff, I'm posting
here to make you aware of the following.

On bug 3902, a pretty long discussion took place about the slowness of Heroes of
might and magic 4, which was caused by a lot of copying between DIBs and X11
pixmaps.

2 patches were made, one started by Iulian and finished by me, that calculates
the dirty rectangle of a bitmap before copying it, so less data has to be
copied. That patch would have to be extended significantly (every GDI function
has to set/clear the dirty rectangle), but people have reported improved
performance with just BitBlt setting/clearing the rect.

The other patch, which was committed today, was made by me, and it does
client-side copying of 15/16/24/32 bpp bitmaps (if you ever saw the "fixme:
potential optimization - client-side DIB copy", that's where it will help). This
patch vastly improves the performance of Heroes 4.

So can you please test all slow-running apps against the latest Git (or
alternatively against wine 0.9.24 patched with the client-side DIB copy patch
from bug 3902) and report how much it helps?

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