PaintInvalidationState::PaintInvalidationState(PaintInvalidationState& next, LayoutBoxModelObject& layoutObject, const LayoutBoxModelObject& paintInvalidationContainer)
: m_clipped(false)
, m_cachedOffsetsEnabled(true)
, m_forcedSubtreeInvalidationWithinContainer(next.m_forcedSubtreeInvalidationWithinContainer)
, m_forcedSubtreeInvalidationRectUpdateWithinContainer(next.m_forcedSubtreeInvalidationRectUpdateWithinContainer)
, m_viewClippingAndScrollOffsetDisabled(false)
, m_paintInvalidationContainer(paintInvalidationContainer)
, m_pendingDelayedPaintInvalidations(next.pendingDelayedPaintInvalidationTargets())
, m_enclosingSelfPaintingLayer(next.enclosingSelfPaintingLayer(layoutObject))
{
// FIXME: SVG could probably benefit from a stack-based optimization like html does. crbug.com/391054
bool establishesPaintInvalidationContainer = layoutObject == m_paintInvalidationContainer;
bool fixed = layoutObject.style()->position() == FixedPosition;
if (!layoutObject.supportsPaintInvalidationStateCachedOffsets() || !next.m_cachedOffsetsEnabled)
m_cachedOffsetsEnabled = false;
if (establishesPaintInvalidationContainer) {
// When we hit a new paint invalidation container, we don't need to
// continue forcing a check for paint invalidation, since we're
// descending into a different invalidation container. (For instance if
// our parents were moved, the entire container will just move.)
m_forcedSubtreeInvalidationWithinContainer = false;
} else {
if (m_cachedOffsetsEnabled) {
if (fixed) {
FloatPoint fixedOffset = layoutObject.localToAncestorPoint(FloatPoint(), &m_paintInvalidationContainer, TraverseDocumentBoundaries);
m_paintOffset = LayoutSize(fixedOffset.x(), fixedOffset.y());
} else {
LayoutSize offset = layoutObject.isBox() && !layoutObject.isTableRow() ? toLayoutBox(layoutObject).locationOffset() : LayoutSize();
m_paintOffset = next.m_paintOffset + offset;
}
if (layoutObject.isOutOfFlowPositioned() && !fixed) {
if (LayoutObject* container = layoutObject.container()) {
if (container->style()->hasInFlowPosition() && container->isLayoutInline())
m_paintOffset += toLayoutInline(container)->offsetForInFlowPositionedInline(toLayoutBox(layoutObject));
}
}
if (layoutObject.style()->hasInFlowPosition() && layoutObject.hasLayer())
m_paintOffset += layoutObject.layer()->offsetForInFlowPosition();
}
m_clipped = !fixed && next.m_clipped;
if (m_clipped)
m_clipRect = next.m_clipRect;
}
if (m_cachedOffsetsEnabled && layoutObject.isSVGRoot()) {
const LayoutSVGRoot& svgRoot = toLayoutSVGRoot(layoutObject);
m_svgTransform = AffineTransform(svgRoot.localToBorderBoxTransform());
if (svgRoot.shouldApplyViewportClip())
addClipRectRelativeToPaintOffset(LayoutSize(svgRoot.pixelSnappedSize()));
}
applyClipIfNeeded(layoutObject);
// FIXME: <http://bugs.webkit.org/show_bug.cgi?id=13443> Apply control clip if present.
}
