Compute snap offsets (both repeat and element based)

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1196 matching lines @@
     // FIXME: Unify "devtools.timeline.invalidationTracking" and "blink.invalidation". crbug.com/413527.
     TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline.invalidationTracking"),
         "PaintInvalidationTracking",
         TRACE_EVENT_SCOPE_THREAD,
         "data", InspectorPaintInvalidationTrackingEvent::data(this, paintInvalidationContainer));
     TRACE_EVENT2(TRACE_DISABLED_BY_DEFAULT("blink.invalidation"), "LayoutObject::invalidatePaintUsingContainer()",
         "object", this->debugName().ascii(),
         "info", jsonObjectForPaintInvalidationInfo(dirtyRect, paintInvalidationReasonToString(invalidationReason)));
 
     // This conditional handles situations where non-rooted (and hence non-composited) frames are
-    // painted, such as SVG images. 
+    // painted, such as SVG images.
     if (!paintInvalidationContainer.isPaintInvalidationContainer())
         invalidatePaintRectangleOnWindow(paintInvalidationContainer, enclosingIntRect(dirtyRect));
 
     if (paintInvalidationContainer.view()->usesCompositing() && paintInvalidationContainer.isPaintInvalidationContainer())
         paintInvalidationContainer.setBackingNeedsPaintInvalidationInRect(dirtyRect, invalidationReason);
 }
 
 void LayoutObject::invalidateDisplayItemClient(const DisplayItemClientWrapper& displayItemClient) const
 {
     // Not using enclosingCompositedContainer() directly because this object may be in an orphaned subtree.
     if (PaintLayer* enclosingLayer = this->enclosingLayer()) {
         // This is valid because we want to invalidate the client in the display item list of the current backing.
         DisableCompositingQueryAsserts disabler;
         // Only the object needs to be invalidated, so use an empty invalidation rect.
         LayoutRect invalidationRect;
         if (const PaintLayer* paintInvalidationLayer = enclosingLayer->enclosingLayerForPaintInvalidationCrossingFrameBoundaries())
             paintInvalidationLayer->layoutObject()->invalidateDisplayItemClientOnBacking(displayItemClient, PaintInvalidationFull, invalidationRect, invalidationRect);
 
         enclosingLayer->setNeedsRepaint();
     }
 }
 
 void LayoutObject::invalidateDisplayItemClients(const LayoutBoxModelObject& paintInvalidationContainer, PaintInvalidationReason invalidationReason, const LayoutRect& previousPaintInvalidationRect, const LayoutRect& newPaintInvalidationRect) const
-{ 
+{
     paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*this, invalidationReason, previousPaintInvalidationRect, newPaintInvalidationRect);
 
     if (PaintLayer* enclosingLayer = this->enclosingLayer())
         enclosingLayer->setNeedsRepaint();
 }
 
 LayoutRect LayoutObject::boundsRectForPaintInvalidation(const LayoutBoxModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState) const
 {
     if (!paintInvalidationContainer)
         return computePaintInvalidationRect(paintInvalidationContainer, paintInvalidationState);
@@ skipping 2234 matching lines @@
         const blink::LayoutObject* root = object1;
         while (root->parent())
             root = root->parent();
         root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
     } else {
         fprintf(stderr, "Cannot showLayoutTree. Root is (nil)\n");
     }
 }
 
 #endif