Convert Settings::rootLayerScrolls to RuntimeEnabledFeatures

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"
 #include "core/layout/LayoutPart.h"
 #include "core/layout/svg/LayoutSVGRoot.h"
 #include "core/paint/ObjectPaintProperties.h"
 #include "core/paint/PaintLayer.h"
 #include "core/paint/SVGRootPainter.h"
 #include "platform/transforms/TransformationMatrix.h"
 #include "wtf/PtrUtil.h"
 #include <memory>
 
 namespace blink {
 
 void PaintPropertyTreeBuilder::buildTreeRootNodes(FrameView& rootFrame, PaintPropertyTreeBuilderContext& context)
 {
-    Settings* settings = rootFrame.frame().settings();
-    if (settings && settings->rootLayerScrolls())
+    if (RuntimeEnabledFeatures::rootLayerScrollingEnabled())
         return;
 
     if (!rootFrame.rootTransform() || rootFrame.rootTransform()->parent()) {
         rootFrame.setRootTransform(TransformPaintPropertyNode::create(nullptr, TransformationMatrix(), FloatPoint3D()));
         rootFrame.setRootClip(ClipPaintPropertyNode::create(nullptr, rootFrame.rootTransform(), FloatRoundedRect(LayoutRect::infiniteIntRect())));
         rootFrame.setRootEffect(EffectPaintPropertyNode::create(nullptr, 1.0));
     } else {
         DCHECK(rootFrame.rootClip() && !rootFrame.rootClip()->parent());
         DCHECK(rootFrame.rootEffect() && !rootFrame.rootEffect()->parent());
     }
 
     context.current.transform = context.absolutePosition.transform = context.fixedPosition.transform = rootFrame.rootTransform();
     context.current.clip = context.absolutePosition.clip = context.fixedPosition.clip = rootFrame.rootClip();
     context.currentEffect = rootFrame.rootEffect();
 }
 
 void PaintPropertyTreeBuilder::buildTreeNodes(FrameView& frameView, PaintPropertyTreeBuilderContext& context)
 {
-    Settings* settings = frameView.frame().settings();
-    if (settings && settings->rootLayerScrolls()) {
+    if (RuntimeEnabledFeatures::rootLayerScrollingEnabled()) {
         LayoutView* layoutView = frameView.layoutView();
         if (!layoutView)
             return;
 
         TransformationMatrix frameTranslate;
         frameTranslate.translate(
             frameView.x() + layoutView->location().x() + context.current.paintOffset.x(),
             frameView.y() + layoutView->location().y() + context.current.paintOffset.y());
         context.current.transform = layoutView->getMutableForPainting().ensureObjectPaintProperties().createOrUpdatePaintOffsetTranslation(
             context.current.transform, frameTranslate, FloatPoint3D());
@@ skipping 132 matching lines @@
     }
 
     if (ObjectPaintProperties* properties = object.getMutableForPainting().objectPaintProperties())
         properties->clearTransform();
 }
 
 void PaintPropertyTreeBuilder::updateEffect(const LayoutObject& object, PaintPropertyTreeBuilderContext& context)
 {
     if (object.isLayoutView() && !context.currentEffect) {
         const LayoutView& layoutView = toLayoutView(object);
-        DCHECK(layoutView.frameView()->frame().settings()->rootLayerScrolls());
+        DCHECK(RuntimeEnabledFeatures::rootLayerScrollingEnabled());
         DCHECK(layoutView.frameView()->frame().isMainFrame());
         context.currentEffect = layoutView.getMutableForPainting().ensureObjectPaintProperties().createOrUpdateEffect(nullptr, 1.0);
         return;
     }
 
     if (!object.styleRef().hasOpacity()) {
         if (ObjectPaintProperties* properties = object.getMutableForPainting().objectPaintProperties())
             properties->clearEffect();
         return;
     }
@@ skipping 27 matching lines @@
         return;
 
     std::unique_ptr<ObjectPaintProperties::LocalBorderBoxProperties> borderBoxContext =
         wrapUnique(new ObjectPaintProperties::LocalBorderBoxProperties);
     borderBoxContext->paintOffset = context.current.paintOffset;
     borderBoxContext->propertyTreeState = PropertyTreeState(context.current.transform, context.current.clip, context.currentEffect);
 
     if (!context.current.clip) {
         DCHECK(object.isLayoutView());
         DCHECK(toLayoutView(object).frameView()->frame().isMainFrame());
-        DCHECK(toLayoutView(object).frameView()->frame().settings()->rootLayerScrolls());
+        DCHECK(RuntimeEnabledFeatures::rootLayerScrollingEnabled());
         borderBoxContext->propertyTreeState.clip = ClipPaintPropertyNode::create(nullptr, context.current.transform, FloatRoundedRect(LayoutRect::infiniteIntRect()));
         context.current.clip = borderBoxContext->propertyTreeState.clip.get();
     }
 
     object.getMutableForPainting().ensureObjectPaintProperties().setLocalBorderBoxProperties(std::move(borderBoxContext));
 
 }
 
 // TODO(trchen): Remove this once we bake the paint offset into frameRect.
 void PaintPropertyTreeBuilder::updateScrollbarPaintOffset(const LayoutObject& object, const PaintPropertyTreeBuilderContext& context)
@@ skipping 98 matching lines @@
     context.current.shouldFlattenInheritedTransform = false;
     context.current.renderingContextID = 0;
 }
 
 void PaintPropertyTreeBuilder::updateScrollTranslation(const LayoutObject& object, PaintPropertyTreeBuilderContext& context)
 {
     if (object.isBoxModelObject() && object.hasOverflowClip()) {
         PaintLayer* layer = toLayoutBoxModelObject(object).layer();
         DCHECK(layer);
         DoubleSize scrollOffset = layer->getScrollableArea()->scrollOffset();
-        bool forceScrollingForLayoutView = false;
-        if (object.isLayoutView()) {
-            Settings* settings = object.document().settings();
-            forceScrollingForLayoutView = (settings && settings->rootLayerScrolls());
-        }
+        bool forceScrollingForLayoutView = object.isLayoutView() && RuntimeEnabledFeatures::rootLayerScrollingEnabled();
         if (forceScrollingForLayoutView || !scrollOffset.isZero() || layer->scrollsOverflow()) {
             TransformationMatrix matrix = TransformationMatrix().translate(-scrollOffset.width(), -scrollOffset.height());
             context.current.transform = object.getMutableForPainting().ensureObjectPaintProperties().createOrUpdateScrollTranslation(
                 context.current.transform, matrix, FloatPoint3D(), context.current.shouldFlattenInheritedTransform, context.current.renderingContextID);
             context.current.shouldFlattenInheritedTransform = false;
             return;
         }
     }
 
     if (ObjectPaintProperties* properties = object.getMutableForPainting().objectPaintProperties())
         properties->clearScrollTranslation();
 }
 
 void PaintPropertyTreeBuilder::updateOutOfFlowContext(const LayoutObject& object, PaintPropertyTreeBuilderContext& context)
 {
     if (object.canContainAbsolutePositionObjects()) {
         context.absolutePosition = context.current;
         context.containerForAbsolutePosition = &object;
     }
 
     if (object.isLayoutView()) {
-        Settings* settings = object.document().settings();
-        if (settings && settings->rootLayerScrolls()) {
+        if (RuntimeEnabledFeatures::rootLayerScrollingEnabled()) {
             context.fixedPosition = context.current;
             const TransformPaintPropertyNode* transform = object.objectPaintProperties()->paintOffsetTranslation();
             DCHECK(transform);
             context.fixedPosition.transform = transform;
         }
     } else if (object.canContainFixedPositionObjects()) {
         context.fixedPosition = context.current;
     } else if (object.getMutableForPainting().objectPaintProperties() && object.objectPaintProperties()->cssClip()) {
         // CSS clip applies to all descendants, even if this object is not a containing block
         // ancestor of the descendant. It is okay for absolute-position descendants because
@@ skipping 87 matching lines @@
         return;
 
     updateOverflowClip(object, context);
     updatePerspective(object, context);
     updateSvgLocalToBorderBoxTransform(object, context);
     updateScrollTranslation(object, context);
     updateOutOfFlowContext(object, context);
 }
 
 } // namespace blink