Compute slope using fSnappedY
If we use the oldy and dy directly as we did previously, the slope could
be very different from (newSnappedX - fSnappedX) / (newSnappedY -
fSnappedY) in the updateLine when the edge made a lot of updates with
small dy but large dx. That will cause bug skia:5995
BUG=skia:5995
Change-Id: If521976ed87195dfea5961afd58bedb98447c568
Reviewed-on: https://skia-review.googlesource.com/5269
Reviewed-by: Cary Clark <caryclark@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
2 files changed