[No submit][SPInvalidation] Track paint offset change

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/PaintPropertyTreeBuilder.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/layout/LayoutInline.h"
@@ skipping 208 matching lines @@
                                              roundedPaintOffset.y()),
             FloatPoint3D(), context.current.shouldFlattenInheritedTransform,
             context.current.renderingContextID);
   } else {
     if (auto* properties = object.getMutableForPainting().paintProperties())
       properties->clearPaintOffsetTranslation();
   }
 
   const auto* properties = object.paintProperties();
   if (properties && properties->paintOffsetTranslation()) {
+    LOG(ERROR) << object.debugName() << " created paintOffsetTranslation";
     context.current.transform = properties->paintOffsetTranslation();
     context.current.paintOffset = fractionalPaintOffset;
     if (RuntimeEnabledFeatures::rootLayerScrollingEnabled() &&
         object.isLayoutView()) {
       context.absolutePosition.transform = properties->paintOffsetTranslation();
       context.fixedPosition.transform = properties->paintOffsetTranslation();
       context.absolutePosition.paintOffset = LayoutPoint();
       context.fixedPosition.paintOffset = LayoutPoint();
     }
   }
+
+  LOG(ERROR) << object.debugName()
+             << " paintOffset:" << context.current.paintOffset.toString();
 }
 
 static FloatPoint3D transformOrigin(const LayoutBox& box) {
   const ComputedStyle& style = box.styleRef();
   FloatSize borderBoxSize(box.size());
   return FloatPoint3D(
       floatValueForLength(style.transformOriginX(), borderBoxSize.width()),
       floatValueForLength(style.transformOriginY(), borderBoxSize.height()),
       style.transformOriginZ());
 }
@@ skipping 410 matching lines @@
     context.current.shouldFlattenInheritedTransform = false;
   }
 }
 
 void PaintPropertyTreeBuilder::updateOutOfFlowContext(
     const LayoutObject& object,
     PaintPropertyTreeBuilderContext& context) {
   if (object.canContainAbsolutePositionObjects()) {
     context.absolutePosition = context.current;
     context.containerForAbsolutePosition = &object;
+    LOG(ERROR) << object.debugName() << " canContainAbsolute: paintOffset="
+               << context.absolutePosition.paintOffset.toString();
   }
 
   if (object.isLayoutView()) {
     if (RuntimeEnabledFeatures::rootLayerScrollingEnabled()) {
       const auto* initialFixedTransform = context.fixedPosition.transform;
       auto* initialFixedScroll = context.fixedPosition.scroll;
 
       context.fixedPosition = context.current;
 
       // Fixed position transform and scroll nodes should not be affected.
@@ skipping 135 matching lines @@
   // SVGForeignObject needs paint offset because its viewport offset is baked
   // into its location(), while its localSVGTransform() doesn't contain the
   // offset.
   if (boxModelObject.isBox() &&
       (!boxModelObject.isSVG() || boxModelObject.isSVGRoot() ||
        boxModelObject.isSVGForeignObject())) {
     // TODO(pdr): Several calls in this function walk back up the tree to
     // calculate containers (e.g., topLeftLocation, offsetForInFlowPosition*).
     // The containing block and other containers can be stored on
     // PaintPropertyTreeBuilderContext instead of recomputing them.
+    LOG(ERROR) << object.debugName() << " before offset paintOffset="
+               << context.current.paintOffset.toString();
     context.current.paintOffset.moveBy(
         toLayoutBox(boxModelObject).topLeftLocation());
+    LOG(ERROR) << object.debugName() << " add offset paintOffset="
+               << context.current.paintOffset.toString();
     // This is a weird quirk that table cells paint as children of table rows,
     // but their location have the row's location baked-in.
     // Similar adjustment is done in LayoutTableCell::offsetFromContainer().
     if (boxModelObject.isTableCell()) {
       LayoutObject* parentRow = boxModelObject.parent();
       DCHECK(parentRow && parentRow->isTableRow());
       context.current.paintOffset.moveBy(
           -toLayoutBox(parentRow)->topLeftLocation());
     }
   }
@@ skipping 23 matching lines @@
     return;
 
   updateOverflowClip(object, context);
   updatePerspective(object, context);
   updateSvgLocalToBorderBoxTransform(object, context);
   updateScrollAndScrollTranslation(object, context);
   updateOutOfFlowContext(object, context);
 }
 
 }  // namespace blink