/* * Copyright (C) 2011 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #if ENABLE(VIDEO_TRACK) #include "JSTextTrackCue.h" #include "JSTrackCustom.h" #include "TextTrack.h" using namespace JSC; namespace WebCore { bool JSTextTrackCueOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, SlotVisitor& visitor) { JSTextTrackCue* jsTextTrackCue = jsCast<JSTextTrackCue*>(handle.get().asCell()); TextTrackCue* textTrackCue = static_cast<TextTrackCue*>(jsTextTrackCue->impl()); // If the cue is firing event listeners, its wrapper is reachable because // the wrapper is responsible for marking those event listeners. if (textTrackCue->isFiringEventListeners()) return true; // If the cue has no event listeners and has no custom properties, it is not reachable. if (!textTrackCue->hasEventListeners() && !jsTextTrackCue->hasCustomProperties()) return false; // If the cue is not associated with a track, it is not reachable. if (!textTrackCue->track()) return false; return visitor.containsOpaqueRoot(root(textTrackCue->track())); } void JSTextTrackCue::visitChildren(JSCell* cell, SlotVisitor& visitor) { JSTextTrackCue* jsTextTrackCue = jsCast<JSTextTrackCue*>(cell); ASSERT_GC_OBJECT_INHERITS(jsTextTrackCue, &s_info); COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag); ASSERT(jsTextTrackCue->structure()->typeInfo().overridesVisitChildren()); Base::visitChildren(jsTextTrackCue, visitor); // Mark the cue's track root if it has one. TextTrackCue* textTrackCue = static_cast<TextTrackCue*>(jsTextTrackCue->impl()); if (TextTrack* textTrack = textTrackCue->track()) visitor.addOpaqueRoot(root(textTrack)); textTrackCue->visitJSEventListeners(visitor); } } // namespace WebCore #endif