Divorce PaintInvalidationState from LayoutState

Source/core/rendering/RenderBox.cpp

Index: Source/core/rendering/RenderBox.cpp
diff --git a/Source/core/rendering/RenderBox.cpp b/Source/core/rendering/RenderBox.cpp
index 26c3c3cea75232b49f43bcffdc13ab1ea3f3959f..189368916d3d9085424c6fef1543b4cc79388ea2 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -1550,7 +1550,7 @@ bool RenderBox::repaintLayerRectsForImage(WrappedImagePtr image, const FillLayer
     return false;
 }
 
-void RenderBox::invalidateTreeAfterLayout(const RenderLayerModelObject& paintInvalidationContainer)
+void RenderBox::invalidateTreeAfterLayout(const InvalidationTreeWalkState& invalidationTreeWalkState)
 {
     // FIXME: Currently only using this logic for RenderBox and its ilk. Ideally, RenderBlockFlows with
     // inline children should track a dirty rect in local coordinates for dirty lines instead of invalidating
@@ -1564,21 +1564,21 @@ void RenderBox::invalidateTreeAfterLayout(const RenderLayerModelObject& paintInv
         return;
 
     bool establishesNewPaintInvalidationContainer = isPaintInvalidationContainer();
-    const RenderLayerModelObject& newPaintInvalidationContainer = *adjustCompositedContainerForSpecialAncestors(establishesNewPaintInvalidationContainer ? this : &paintInvalidationContainer);
+    const RenderLayerModelObject& newPaintInvalidationContainer = *adjustCompositedContainerForSpecialAncestors(establishesNewPaintInvalidationContainer ? this : &invalidationTreeWalkState.paintInvalidationContainer());
     // FIXME: This assert should be re-enabled when we move paint invalidation to after compositing update. crbug.com/360286
     // ASSERT(&newPaintInvalidationContainer == containerForPaintInvalidation());
 
     const LayoutRect oldPaintInvalidationRect = previousPaintInvalidationRect();
     const LayoutPoint oldPositionFromPaintInvalidationContainer = previousPositionFromPaintInvalidationContainer();
-    setPreviousPaintInvalidationRect(boundsRectForPaintInvalidation(&newPaintInvalidationContainer));
-    setPreviousPositionFromPaintInvalidationContainer(RenderLayer::positionFromPaintInvalidationContainer(this, &newPaintInvalidationContainer));
+    setPreviousPaintInvalidationRect(boundsRectForPaintInvalidation(&newPaintInvalidationContainer, &invalidationTreeWalkState));
+    setPreviousPositionFromPaintInvalidationContainer(RenderLayer::positionFromPaintInvalidationContainer(this, &newPaintInvalidationContainer, &invalidationTreeWalkState));
 
     // If we are set to do a full paint invalidation that means the RenderView will be
     // issue paint invalidations. We can then skip issuing of paint invalidations for the child
     // renderers as they'll be covered by the RenderView.
     if (view()->doingFullRepaint()) {
-        LayoutState state(*this, isTableRow() ? LayoutSize() : locationOffset());
-        RenderObject::invalidateTreeAfterLayout(newPaintInvalidationContainer);
+        InvalidationTreeWalkState childTreeWalkState(invalidationTreeWalkState, *this, newPaintInvalidationContainer);
+        RenderObject::invalidateTreeAfterLayout(childTreeWalkState);
         return;
     }
 
@@ -1603,17 +1603,8 @@ void RenderBox::invalidateTreeAfterLayout(const RenderLayerModelObject& paintInv
         }
     }
 
-    // FIXME: LayoutState should be enabled for other paint invalidation containers than the RenderView. crbug.com/363834
-    if (establishesNewPaintInvalidationContainer && !isRenderView()) {
-        ForceHorriblySlowRectMapping slowRectMapping(*this);
-        RenderObject::invalidateTreeAfterLayout(newPaintInvalidationContainer);
-    } else {
-        // FIXME: This concept of a tree walking state for fast lookups should be generalized away from
-        // just layout.
-        // FIXME: Table rows shouldn't be special-cased.
-        LayoutState state(*this, isTableRow() ? LayoutSize() : locationOffset());
-        RenderObject::invalidateTreeAfterLayout(newPaintInvalidationContainer);
-    }
+    InvalidationTreeWalkState childTreeWalkState(invalidationTreeWalkState, *this, newPaintInvalidationContainer);
+    RenderObject::invalidateTreeAfterLayout(childTreeWalkState);
 }
 
 bool RenderBox::pushContentsClip(PaintInfo& paintInfo, const LayoutPoint& accumulatedOffset, ContentsClipBehavior contentsClipBehavior)
@@ -1794,20 +1785,17 @@ LayoutUnit RenderBox::perpendicularContainingBlockLogicalHeight() const
     return cb->adjustContentBoxLogicalHeightForBoxSizing(logicalHeightLength.value());
 }
 
-void RenderBox::mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed) const
+void RenderBox::mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed, const InvalidationTreeWalkState* invalidationTreeWalkState) const
 {
     if (repaintContainer == this)
         return;
 
-    if (RenderView* v = view()) {
-        if (v->canMapUsingLayoutStateForContainer(repaintContainer)) {
-            LayoutState* layoutState = v->layoutState();
-            LayoutSize offset = layoutState->paintOffset() + locationOffset();
-            if (style()->hasInFlowPosition() && layer())
-                offset += layer()->offsetForInFlowPosition();
-            transformState.move(offset);
-            return;
-        }
+    if (invalidationTreeWalkState && invalidationTreeWalkState->canMapToContainer(repaintContainer)) {
+        LayoutSize offset = invalidationTreeWalkState->paintOffset() + locationOffset();
+        if (style()->hasInFlowPosition() && layer())
+            offset += layer()->offsetForInFlowPosition();
+        transformState.move(offset);
+        return;
     }
 
     bool containerSkipped;
@@ -1852,9 +1840,6 @@ void RenderBox::mapLocalToContainer(const RenderLayerModelObject* repaintContain
 
 void RenderBox::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, TransformState& transformState) const
 {
-    // We don't expect to be called during layout.
-    ASSERT(!view() || !view()->layoutStateCachedOffsetsEnabled());
-
     bool isFixedPos = style()->position() == FixedPosition;
     bool hasTransform = hasLayer() && layer()->transform();
     if (hasTransform && !isFixedPos) {
@@ -1972,17 +1957,17 @@ void RenderBox::deleteLineBoxWrapper()
     }
 }
 
-LayoutRect RenderBox::clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer) const
+LayoutRect RenderBox::clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const InvalidationTreeWalkState* invalidationTreeWalkState) const
 {
     if (style()->visibility() != VISIBLE && enclosingLayer()->subtreeIsInvisible())
         return LayoutRect();
 
     LayoutRect r = visualOverflowRect();
-    mapRectToPaintInvalidationBacking(paintInvalidationContainer, r);
+    mapRectToPaintInvalidationBacking(paintInvalidationContainer, r, invalidationTreeWalkState);
     return r;
 }
 
-void RenderBox::mapRectToPaintInvalidationBacking(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect& rect, bool fixed) const
+void RenderBox::mapRectToPaintInvalidationBacking(const RenderLayerModelObject* paintInvalidationContainer, LayoutRect& rect, bool fixed, const InvalidationTreeWalkState* invalidationTreeWalkState) const
 {
     // The rect we compute at each step is shifted by our x/y offset in the parent container's coordinate space.
     // Only when we cross a writing mode boundary will we have to possibly flipForWritingMode (to convert into a more appropriate
@@ -1993,24 +1978,20 @@ void RenderBox::mapRectToPaintInvalidationBacking(const RenderLayerModelObject*
     // physical when we hit a paintInvalidationContainer boundary. Therefore the final rect returned is always in the
     // physical coordinate space of the paintInvalidationContainer.
     RenderStyle* styleToUse = style();
-    if (RenderView* v = view()) {
-        // LayoutState is only valid for root-relative, non-fixed position repainting
-        if (v->canMapUsingLayoutStateForContainer(paintInvalidationContainer) && styleToUse->position() != FixedPosition) {
-            LayoutState* layoutState = v->layoutState();
-
-            if (layer() && layer()->transform())
-                rect = layer()->transform()->mapRect(pixelSnappedIntRect(rect));
-
-            // We can't trust the bits on RenderObject, because this might be called while re-resolving style.
-            if (styleToUse->hasInFlowPosition() && layer())
-                rect.move(layer()->offsetForInFlowPosition());
-
-            rect.moveBy(location());
-            rect.move(layoutState->paintOffset());
-            if (layoutState->isClipped())
-                rect.intersect(layoutState->clipRect());
-            return;
-        }
+
+    if (invalidationTreeWalkState && invalidationTreeWalkState->canMapToContainer(paintInvalidationContainer) && styleToUse->position() != FixedPosition) {
+        if (layer() && layer()->transform())
+            rect = layer()->transform()->mapRect(pixelSnappedIntRect(rect));
+
+        // We can't trust the bits on RenderObject, because this might be called while re-resolving style.
+        if (styleToUse->hasInFlowPosition() && layer())
+            rect.move(layer()->offsetForInFlowPosition());
+
+        rect.moveBy(location());
+        rect.move(invalidationTreeWalkState->paintOffset());
+        if (invalidationTreeWalkState->isClipped())
+            rect.intersect(invalidationTreeWalkState->clipRect());
+        return;
     }
 
     if (hasReflection())
@@ -2079,7 +2060,7 @@ void RenderBox::mapRectToPaintInvalidationBacking(const RenderLayerModelObject*
         return;
     }
 
-    o->mapRectToPaintInvalidationBacking(paintInvalidationContainer, rect, fixed);
+    o->mapRectToPaintInvalidationBacking(paintInvalidationContainer, rect, fixed, invalidationTreeWalkState);
 }
 
 void RenderBox::invalidatePaintForOverhangingFloats(bool)