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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "config.h"
      6 #include "core/svg/SVGElementRareData.h"
      7 
      8 #include "core/css/CSSCursorImageValue.h"
      9 #include "core/css/resolver/StyleResolver.h"
     10 #include "core/dom/Document.h"
     11 #include "core/svg/SVGCursorElement.h"
     12 
     13 namespace blink {
     14 
     15 MutableStylePropertySet* SVGElementRareData::ensureAnimatedSMILStyleProperties()
     16 {
     17     if (!m_animatedSMILStyleProperties)
     18         m_animatedSMILStyleProperties = MutableStylePropertySet::create(SVGAttributeMode);
     19     return m_animatedSMILStyleProperties.get();
     20 }
     21 
     22 RenderStyle* SVGElementRareData::overrideComputedStyle(Element* element, RenderStyle* parentStyle)
     23 {
     24     ASSERT(element);
     25     if (!m_useOverrideComputedStyle)
     26         return 0;
     27     if (!m_overrideComputedStyle || m_needsOverrideComputedStyleUpdate) {
     28         // The style computed here contains no CSS Animations/Transitions or SMIL induced rules - this is needed to compute the "base value" for the SMIL animation sandwhich model.
     29         m_overrideComputedStyle = element->document().ensureStyleResolver().styleForElement(element, parentStyle, DisallowStyleSharing, MatchAllRulesExcludingSMIL);
     30         m_needsOverrideComputedStyleUpdate = false;
     31     }
     32     ASSERT(m_overrideComputedStyle);
     33     return m_overrideComputedStyle.get();
     34 }
     35 
     36 void SVGElementRareData::trace(Visitor* visitor)
     37 {
     38 #if ENABLE(OILPAN)
     39     visitor->trace(m_outgoingReferences);
     40     visitor->trace(m_incomingReferences);
     41     visitor->trace(m_animatedSMILStyleProperties);
     42     visitor->trace(m_elementInstances);
     43     visitor->trace(m_correspondingElement);
     44     visitor->trace(m_owner);
     45     visitor->registerWeakMembers<SVGElementRareData, &SVGElementRareData::processWeakMembers>(this);
     46 #endif
     47 }
     48 
     49 void SVGElementRareData::processWeakMembers(Visitor* visitor)
     50 {
     51 #if ENABLE(OILPAN)
     52         ASSERT(m_owner);
     53         if (!visitor->isAlive(m_cursorElement))
     54             m_cursorElement = nullptr;
     55 
     56         if (!visitor->isAlive(m_cursorImageValue)) {
     57             // The owning SVGElement is still alive and if it is pointing to an SVGCursorElement
     58             // we unregister it when the CSSCursorImageValue dies.
     59             if (m_cursorElement) {
     60                 m_cursorElement->removeReferencedElement(m_owner);
     61                 m_cursorElement = nullptr;
     62             }
     63             m_cursorImageValue = nullptr;
     64         }
     65         ASSERT(!m_cursorElement || visitor->isAlive(m_cursorElement));
     66         ASSERT(!m_cursorImageValue || visitor->isAlive(m_cursorImageValue));
     67 #endif
     68 }
     69 
     70 
     71 }
     72