RESOLVED FIXED 70751
[chromium] Use the full set of rects when determining if union covers another rect. 
https://bugs.webkit.org/show_bug.cgi?id=70751
Summary [chromium] Use the full set of rects when determining if union covers another...
Dana Jansens
Reported 2011-10-24 12:47:06 PDT
There are places where we want to know if a union of rects together cover a (rectangular) space. Currently we just look for a single child that fills the space. This gives no false-positives, but potentially many false negatives. Add logic to determine if the union of rects fill a rect, and use it in these cases.
Attachments
Patch (22.84 KB, patch)
2011-10-28 08:43 PDT, W. James MacLean 		no flags
DetailsFormatted DiffDiff
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Dana Jansens
Comment 1 2011-10-24 12:47:44 PDT
Bugs this depend on represent places where the improved logic should be used.
W. James MacLean
Comment 2 2011-10-28 08:43:58 PDT
Created attachment 112868 [details] Patch
Dana Jansens
Comment 3 2011-11-24 11:15:58 PST
Can make use of platform/graphics/Region class to do all of this. It is what I am using it in the webkit side. If you need Region::contains() you can replace "A.contains(B)" with A.intersect(B); if (!A.isEmpty()) B.subtract(A); return B.isEmpty(); and use .contains() when bug #72298 lands. Removing dep on #70634 since this is useful for UI layers already regardless of opaque flag being set in WebCore land.
W. James MacLean
Comment 4 2012-01-09 11:39:59 PST
I think this is covered in 70533. Marking resolved.
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