Improve code readibility of PaintPropertyTreeBuilder

third_party/WebKit/Source/core/paint/PaintLayerPainter.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/PaintLayerPainter.h"
 
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
 #include "core/layout/LayoutBlock.h"
 #include "core/layout/LayoutView.h"
@@ skipping 352 matching lines @@
     }
 
     bool selectionOnly = localPaintingInfo.getGlobalPaintFlags() & GlobalPaintSelectionOnly;
 
     { // Begin block for the lifetime of any filter.
         FilterPainter filterPainter(m_paintLayer, context, offsetFromRoot, layerFragments.isEmpty() ? ClipRect() : layerFragments[0].backgroundRect, localPaintingInfo, paintFlags,
             rootRelativeBounds, rootRelativeBoundsComputed);
 
         Optional<ScopedPaintChunkProperties> scopedPaintChunkProperties;
         if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
-            ObjectPaintProperties* objectPaintProperties = m_paintLayer.layoutObject()->objectPaintProperties();
+            const ObjectPaintProperties* objectPaintProperties = m_paintLayer.layoutObject()->objectPaintProperties();
             ASSERT(objectPaintProperties && objectPaintProperties->localBorderBoxProperties());
             PaintChunkProperties properties(context.getPaintController().currentPaintChunkProperties());
             auto& localBorderBoxProperties = *objectPaintProperties->localBorderBoxProperties();
             properties.transform = localBorderBoxProperties.propertyTreeState.transform;
             properties.clip = localBorderBoxProperties.propertyTreeState.clip;
             properties.effect = localBorderBoxProperties.propertyTreeState.effect;
             properties.backfaceHidden = m_paintLayer.layoutObject()->hasHiddenBackface();
             scopedPaintChunkProperties.emplace(context.getPaintController(), m_paintLayer, properties);
         }
 
@@ skipping 302 matching lines @@
             break;
         }
 
         clipRecorder.emplace(context, *m_paintLayer.layoutObject(), clipType, clipRect, &paintingInfo, fragment.paginationOffset, paintFlags, clippingRule);
     }
 
     LayoutRect newCullRect(clipRect.rect());
     Optional<ScrollRecorder> scrollRecorder;
     LayoutPoint paintOffset = -m_paintLayer.layoutBoxLocation();
     if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
-        ObjectPaintProperties* objectPaintProperties = m_paintLayer.layoutObject()->objectPaintProperties();
+        const ObjectPaintProperties* objectPaintProperties = m_paintLayer.layoutObject()->objectPaintProperties();
         ASSERT(objectPaintProperties && objectPaintProperties->localBorderBoxProperties());
         paintOffset += toSize(objectPaintProperties->localBorderBoxProperties()->paintOffset);
     } else {
         paintOffset += toSize(fragment.layerBounds.location());
         if (!paintingInfo.scrollOffsetAccumulation.isZero()) {
             // As a descendant of the root layer, m_paintLayer's painting is not controlled by the ScrollRecorders
             // created by BlockPainter of the ancestor layers up to the root layer, so we need to issue ScrollRecorder
             // for this layer seperately, with the scroll offset accumulated from the root layer to the parent of this
             // layer, to get the same result as ScrollRecorder in BlockPainter.
             paintOffset += paintingInfo.scrollOffsetAccumulation;
@@ skipping 102 matching lines @@
     if (!m_paintLayer.containsDirtyOverlayScrollbars())
         return;
 
     PaintLayerPaintingInfo paintingInfo(&m_paintLayer, LayoutRect(enclosingIntRect(damageRect)), paintFlags, LayoutSize());
     paintLayer(context, paintingInfo, PaintLayerPaintingOverlayScrollbars);
 
     m_paintLayer.setContainsDirtyOverlayScrollbars(false);
 }
 
 } // namespace blink