reflow comments in core/layout/compositing,core/observer

third_party/WebKit/Source/core/layout/compositing/CompositingReasonFinder.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/layout/compositing/CompositingReasonFinder.h"
 
 #include "core/CSSPropertyNames.h"
 #include "core/dom/Document.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
@@ skipping 81 matching lines @@
 
   if (style.usedTransformStyle3D() == TransformStyle3DPreserve3D)
     reasons |= CompositingReasonPreserve3DWith3DDescendants;
 
   if (style.hasPerspective())
     reasons |= CompositingReasonPerspectiveWith3DDescendants;
 
   if (style.hasCompositorProxy())
     reasons |= CompositingReasonCompositorProxy;
 
-  // If the implementation of createsGroup changes, we need to be aware of that in this part of code.
+  // If the implementation of createsGroup changes, we need to be aware of that
+  // in this part of code.
   ASSERT((layoutObject->isTransparent() || layoutObject->hasMask() ||
           layoutObject->hasFilterInducingProperty() || style.hasBlendMode()) ==
          layoutObject->createsGroup());
 
   if (style.hasMask())
     reasons |= CompositingReasonMaskWithCompositedDescendants;
 
   if (style.hasFilterInducingProperty())
     reasons |= CompositingReasonFilterWithCompositedDescendants;
 
@@ skipping 12 matching lines @@
 
   if (layoutObject->hasReflection())
     reasons |= CompositingReasonReflectionWithCompositedDescendants;
 
   ASSERT(!(reasons & ~CompositingReasonComboAllStyleDeterminedReasons));
   return reasons;
 }
 
 bool CompositingReasonFinder::requiresCompositingForTransform(
     LayoutObject* layoutObject) const {
-  // Note that we ask the layoutObject if it has a transform, because the style may have transforms,
-  // but the layoutObject may be an inline that doesn't support them.
+  // Note that we ask the layoutObject if it has a transform, because the style
+  // may have transforms, but the layoutObject may be an inline that doesn't
+  // support them.
   return layoutObject->hasTransformRelatedProperty() &&
          layoutObject->style()->has3DTransform();
 }
 
 CompositingReasons CompositingReasonFinder::nonStyleDeterminedDirectReasons(
     const PaintLayer* layer) const {
   CompositingReasons directReasons = CompositingReasonNone;
   LayoutObject* layoutObject = layer->layoutObject();
 
   if (layer->needsCompositedScrolling())
     directReasons |= CompositingReasonOverflowScrollingTouch;
 
   // Composite |layer| if it is inside of an ancestor scrolling layer, but that
   // scrolling layer is not on the stacking context ancestor chain of |layer|.
   // See the definition of the scrollParent property in Layer for more detail.
   if (const PaintLayer* scrollingAncestor = layer->ancestorScrollingLayer()) {
     if (scrollingAncestor->needsCompositedScrolling() && layer->scrollParent())
       directReasons |= CompositingReasonOverflowScrollingParent;
   }
 
-  // TODO(flackr): Rename functions and variables to include sticky position (i.e. ScrollDependentPosition rather than PositionFixed).
+  // TODO(flackr): Rename functions and variables to include sticky position
+  // (i.e. ScrollDependentPosition rather than PositionFixed).
   if (requiresCompositingForScrollDependentPosition(layer))
     directReasons |= CompositingReasonScrollDependentPosition;
 
   directReasons |= layoutObject->additionalCompositingReasons();
 
   ASSERT(!(directReasons & CompositingReasonComboAllStyleDeterminedReasons));
   return directReasons;
 }
 
 bool CompositingReasonFinder::requiresCompositingForAnimation(
     const ComputedStyle& style) const {
   if (style.subtreeWillChangeContents())
     return style.isRunningAnimationOnCompositor();
 
   return style.shouldCompositeForCurrentAnimations();
 }
 
 bool CompositingReasonFinder::requiresCompositingForScrollDependentPosition(
     const PaintLayer* layer) const {
   if (layer->layoutObject()->style()->position() != FixedPosition &&
       layer->layoutObject()->style()->position() != StickyPosition)
     return false;
 
   if (!(m_compositingTriggers & ViewportConstrainedPositionedTrigger) &&
       (!RuntimeEnabledFeatures::compositeOpaqueFixedPositionEnabled() ||
        !layer->backgroundIsKnownToBeOpaqueInRect(
            LayoutRect(layer->boundingBoxForCompositing())))) {
     return false;
   }
-  // Don't promote fixed position elements that are descendants of a non-view container, e.g. transformed elements.
-  // They will stay fixed wrt the container rather than the enclosing frame.
+  // Don't promote fixed position elements that are descendants of a non-view
+  // container, e.g. transformed elements.  They will stay fixed wrt the
+  // container rather than the enclosing frame.
   if (layer->scrollsWithViewport())
     return m_layoutView.frameView()->isScrollable();
   return layer->layoutObject()->style()->position() == StickyPosition &&
          layer->ancestorOverflowLayer()->scrollsOverflow();
 }
 
 }  // namespace blink