Account for perspective and preserve-3d in mapToVisualRectInAncestorSpace

third_party/WebKit/Source/core/paint/PaintInvalidator.cpp

Index: third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp b/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
index d8e6e7f2eced417e7755414247171fb11726c4fa..1548ce74529415aef16c568b891e86847eda9134 100644
--- a/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
@@ -33,11 +33,17 @@ static LayoutRect slowMapToVisualRectInAncestorSpace(
   }
 
   LayoutRect result(rect);
-  if (object.isLayoutView())
-    toLayoutView(object).mapToVisualRectInAncestorSpace(
-        &ancestor, result, InputIsInFrameCoordinates, DefaultVisualRectFlags);
-  else
-    object.mapToVisualRectInAncestorSpace(&ancestor, result);
+  if (object.isLayoutView()) {
+    TransformState transformState(TransformState::ApplyTransformDirection,
+                                  FloatQuad(FloatRect(rect)));
+    toLayoutView(object).mapToVisualRectInAncestorSpaceInternal(
+        &ancestor, transformState, InputIsInFrameCoordinates,
+        DefaultVisualRectFlags);
+    transformState.flatten();
+    return LayoutRect(transformState.lastPlanarQuad().boundingBox());

[Xianzhu, 2017/03/03 01:24:42]

Can you wrap the above code into LayoutView::mapToVisualRectInAncestorSpace()?

[chrishtr, 2017/03/03 02:45:11]

Done.

+  }
+
+  object.mapToVisualRectInAncestorSpace(&ancestor, result);
   return result;
 }