void RenderRegion::ensureOverflowForBox(const RenderBox* box, RefPtr<RenderOverflow>& overflow, bool forceCreation)
{
RenderFlowThread* flowThread = this->flowThread();
ASSERT(flowThread);
RenderBoxRegionInfo* boxInfo = renderBoxRegionInfo(box);
if (!boxInfo && !forceCreation)
return;
if (boxInfo && boxInfo->overflow()) {
overflow = boxInfo->overflow();
return;
}
LayoutRect borderBox = box->borderBoxRectInRegion(this);
LayoutRect clientBox;
ASSERT(flowThread->objectShouldPaintInFlowRegion(box, this));
if (!borderBox.isEmpty()) {
borderBox = rectFlowPortionForBox(box, borderBox);
clientBox = box->clientBoxRectInRegion(this);
clientBox = rectFlowPortionForBox(box, clientBox);
flowThread->flipForWritingModeLocalCoordinates(borderBox);
flowThread->flipForWritingModeLocalCoordinates(clientBox);
}
if (boxInfo) {
boxInfo->createOverflow(clientBox, borderBox);
overflow = boxInfo->overflow();
} else
overflow = adoptRef(new RenderOverflow(clientBox, borderBox));
}
LayoutRect RenderNamedFlowFragment::visualOverflowRect() const
{
if (isValid()) {
RenderBoxRegionInfo* boxInfo = renderBoxRegionInfo(flowThread());
if (boxInfo && boxInfo->overflow())
return boxInfo->overflow()->visualOverflowRect();
}
return RenderRegion::visualOverflowRect();
}