[Bug 421] Implement a DIB engine

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

--- Comment #314 from el   2010-02-09 19:34:56 ---
Created an attachment (id=26167)
 --> (http://bugs.winehq.org/attachment.cgi?id=26167)
Fix missing lines in polygons

After investing way too much time into this I have found a possible solution to
the issue of missing horizontal lines. It seems to me that the current
algorithm may miscount the intersections if a polygon vertex is directly on the
current scanline. I propose the attached patch on top of your current engine to
fix this.

However this does not fix polygons completely. If you look very closely on the
following screenshot you can see that some of the polygons are missing a few
single pixels on their right hand side. I currently have no idea why this
happens.
http://img17.imageshack.us/img17/8979/ijifixedlines.png

Btw:
Looks like the first patch in the series is broken (again). If you ever resume
your work on the DIB engine it would be nice if you had a git repository that
we could track.