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authorBjørn Erik Nilsen <bjorn.nilsen@nokia.com>2010-05-04 11:14:10 (GMT)
committerBjørn Erik Nilsen <bjorn.nilsen@nokia.com>2010-05-05 12:34:39 (GMT)
commitc1c7dbf2a066868503dfabcd7113856fa6d2e457 (patch)
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Performance issue with QGraphicsItem::ItemClipsChildrenToShape.
If the child rect is bigger than the parent rect and parent has the ItemClipsChildrenToShape flag set, then by updating the child, the whole child rect is marked as dirty, resulting in a much larger update area than required. This has a major impact on performance in Orbit/HB, where e.g. item-views typically consist of a container item that clips its children/items to shape. See attached video in QTBUG-9024. Auto test included. Task-number: QTBUG-9024
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