Adding the 'filter' context attribute to 2D canvas

Source/core/paint/DeprecatedPaintLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 2602 matching lines @@
 {
     const FilterOperations& filters = style.filter();
     if (filters.hasReferenceFilter()) {
         for (size_t i = 0; i < filters.size(); ++i) {
             FilterOperation* filterOperation = filters.operations().at(i).get();
             if (filterOperation->type() != FilterOperation::REFERENCE)
                 continue;
             ReferenceFilterOperation& referenceOperation = toReferenceFilterOperation(*filterOperation);
             // FIXME: Cache the ReferenceFilter if it didn't change.
             RefPtrWillBeRawPtr<ReferenceFilter> referenceFilter = ReferenceFilter::create(style.effectiveZoom());
-            referenceFilter->setLastEffect(ReferenceFilterBuilder::build(referenceFilter.get(), *layoutObject(), referenceFilter->sourceGraphic(),
+            referenceFilter->setLastEffect(ReferenceFilterBuilder::build(referenceFilter.get(), toElement(enclosingElement()), referenceFilter->sourceGraphic(),
                 referenceOperation));
             referenceOperation.setFilter(referenceFilter.release());
         }
     }
 
     return filters;
 }
 
 void DeprecatedPaintLayer::updateOrRemoveFilterClients()
 {
@@ skipping 21 matching lines @@
 
         return;
     }
 
     DeprecatedPaintLayerFilterInfo* filterInfo = ensureFilterInfo();
     if (!filterInfo->builder())
         filterInfo->setBuilder(FilterEffectBuilder::create());
 
     // If the filter fails to build, remove it from the layer. It will still attempt to
     // go through regular processing (e.g. compositing), but never apply anything.
-    if (!filterInfo->builder()->build(layoutObject(), computeFilterOperations(layoutObject()->styleRef())))
+    float zoom = layoutObject()->style() ? layoutObject()->style()->effectiveZoom() : 1.0f;
+    if (!filterInfo->builder()->build(toElement(enclosingElement()), computeFilterOperations(layoutObject()->styleRef()), zoom))
         filterInfo->setBuilder(nullptr);
 }
 
 void DeprecatedPaintLayer::filterNeedsPaintInvalidation()
 {
     {
         DeprecatedScheduleStyleRecalcDuringLayout marker(layoutObject()->document().lifecycle());
         // It's possible for scheduleSVGFilterLayerUpdateHack to schedule a style recalc, which
         // is a problem because this function can be called while performing layout.
         // Presumably this represents an illegal data flow of layout or compositing
@@ skipping 64 matching lines @@
 
 void showLayerTree(const blink::LayoutObject* layoutObject)
 {
     if (!layoutObject) {
         fprintf(stderr, "Cannot showLayerTree. Root is (nil)\n");
         return;
     }
     showLayerTree(layoutObject->enclosingLayer());
 }
 #endif