[SPv2] Track paint offset change

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

 // Copyright 2014 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/BoxPainter.h"
 
 #include "core/HTMLNames.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/layout/ImageQualityController.h"
 #include "core/layout/LayoutBox.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutTable.h"
 #include "core/layout/LayoutTheme.h"
 #include "core/layout/compositing/CompositedLayerMapping.h"
 #include "core/layout/line/RootInlineBox.h"
 #include "core/style/BorderEdge.h"
 #include "core/style/ShadowList.h"
 #include "core/paint/BackgroundImageGeometry.h"
 #include "core/paint/BoxBorderPainter.h"
 #include "core/paint/BoxDecorationData.h"
 #include "core/paint/LayoutObjectDrawingRecorder.h"
 #include "core/paint/NinePieceImagePainter.h"
+#include "core/paint/ObjectPainter.h"
 #include "core/paint/PaintInfo.h"
 #include "core/paint/PaintLayer.h"
 #include "core/paint/RoundedInnerRectClipper.h"
 #include "core/paint/ScrollRecorder.h"
 #include "core/paint/ThemePainter.h"
 #include "platform/LengthFunctions.h"
 #include "platform/geometry/LayoutPoint.h"
 #include "platform/geometry/LayoutRectOutsets.h"
 #include "platform/graphics/GraphicsContextStateSaver.h"
 #include "platform/graphics/paint/CompositingDisplayItem.h"
 #include "wtf/Optional.h"
 
 namespace blink {
 
 namespace {
 
 bool isPaintingBackgroundOfPaintContainerIntoScrollingContentsLayer(
     const LayoutBoxModelObject* obj,
     const PaintInfo& paintInfo) {
   return paintInfo.paintFlags() & PaintLayerPaintingOverflowContents &&
          !(paintInfo.paintFlags() &
            PaintLayerPaintingCompositingBackgroundPhase) &&
          obj == paintInfo.paintContainer();
 }
 
 }  // namespace
 
 void BoxPainter::paint(const PaintInfo& paintInfo,
                        const LayoutPoint& paintOffset) {
-  LayoutPoint adjustedPaintOffset = paintOffset + m_layoutBox.location();
+  ObjectPainter(m_layoutBox).checkPaintOffset(paintInfo, paintOffset);
   // Default implementation. Just pass paint through to the children.
+  paintChildren(paintInfo, paintOffset + m_layoutBox.location());
+}
+
+void BoxPainter::paintChildren(const PaintInfo& paintInfo,
+                               const LayoutPoint& paintOffset) {
   PaintInfo childInfo(paintInfo);
   for (LayoutObject* child = m_layoutBox.slowFirstChild(); child;
        child = child->nextSibling())
-    child->paint(childInfo, adjustedPaintOffset);
+    child->paint(childInfo, paintOffset);
 }
 
 void BoxPainter::paintBoxDecorationBackground(const PaintInfo& paintInfo,
                                               const LayoutPoint& paintOffset) {
   LayoutRect paintRect;
   Optional<ScrollRecorder> scrollRecorder;
   if (isPaintingBackgroundOfPaintContainerIntoScrollingContentsLayer(
           &m_layoutBox, paintInfo)) {
     // For the case where we are painting the background into the scrolling
     // contents layer of a composited scroller we need to include the entire
@@ skipping 974 matching lines @@
 bool BoxPainter::shouldForceWhiteBackgroundForPrintEconomy(
     const ComputedStyle& style,
     const Document& document) {
   return document.printing() &&
          style.getPrintColorAdjust() == PrintColorAdjustEconomy &&
          (!document.settings() ||
           !document.settings()->shouldPrintBackgrounds());
 }
 
 }  // namespace blink