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));
}
void RenderNamedFlowFragment::absoluteQuadsForBoxInRegion(Vector<FloatQuad>& quads, bool* wasFixed, const RenderBox* renderer, float localTop, float localBottom)
{
LayoutRect layoutLocalRect(0, localTop, renderer->borderBoxRectInRegion(this).width(), localBottom - localTop);
LayoutRect fragmentRect = rectFlowPortionForBox(renderer, layoutLocalRect);
// We want to skip the 0px height fragments for non-empty boxes that may appear in case the bottom of the box
// overlaps the bottom of a region.
if (localBottom != localTop && !fragmentRect.height())
return;
CurrentRenderRegionMaintainer regionMaintainer(*this);
quads.append(renderer->localToAbsoluteQuad(FloatRect(fragmentRect), UseTransforms, wasFixed));
}
// FIXME: This doesn't work for writing modes.
LayoutRect RenderRegion::layoutOverflowRectForBoxForPropagation(const RenderBox* box)
{
// Only propagate interior layout overflow if we don't clip it.
LayoutRect rect = box->borderBoxRectInRegion(this);
rect = rectFlowPortionForBox(box, rect);
if (!box->hasOverflowClip())
rect.unite(layoutOverflowRectForBox(box));
bool hasTransform = box->hasLayer() && box->layer()->transform();
if (box->isInFlowPositioned() || hasTransform) {
if (hasTransform)
rect = box->layer()->currentTransform().mapRect(rect);
if (box->isInFlowPositioned())
rect.move(box->offsetForInFlowPosition());
}
return rect;
}
