1/* 2 * Copyright (C) 2011 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27 28#if ENABLE(VIDEO_TRACK) 29 30#include "JSTextTrackCue.h" 31 32#include "JSDataCue.h" 33#include "JSTrackCustom.h" 34#include "JSVTTCue.h" 35#include "TextTrack.h" 36 37using namespace JSC; 38 39namespace WebCore { 40 41bool JSTextTrackCueOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, SlotVisitor& visitor) 42{ 43 JSTextTrackCue* jsTextTrackCue = jsCast<JSTextTrackCue*>(handle.slot()->asCell()); 44 TextTrackCue& textTrackCue = jsTextTrackCue->impl(); 45 46 // If the cue is firing event listeners, its wrapper is reachable because 47 // the wrapper is responsible for marking those event listeners. 48 if (textTrackCue.isFiringEventListeners()) 49 return true; 50 51 // If the cue has no event listeners and has no custom properties, it is not reachable. 52 if (!textTrackCue.hasEventListeners() && !jsTextTrackCue->hasCustomProperties()) 53 return false; 54 55 // If the cue is not associated with a track, it is not reachable. 56 if (!textTrackCue.track()) 57 return false; 58 59 return visitor.containsOpaqueRoot(root(textTrackCue.track())); 60} 61 62JSValue toJS(ExecState*, JSDOMGlobalObject* globalObject, TextTrackCue* cue) 63{ 64 if (!cue) 65 return jsNull(); 66 67 JSObject* wrapper = getCachedWrapper(globalObject->world(), cue); 68 69 if (wrapper) 70 return wrapper; 71 72 // This switch will make more sense once we support DataCue 73 switch (cue->cueType()) { 74 case TextTrackCue::Data: 75 return CREATE_DOM_WRAPPER(globalObject, DataCue, cue); 76 case TextTrackCue::WebVTT: 77 case TextTrackCue::Generic: 78 return CREATE_DOM_WRAPPER(globalObject, VTTCue, cue); 79 default: 80 ASSERT_NOT_REACHED(); 81 return jsNull(); 82 } 83} 84 85void JSTextTrackCue::visitAdditionalChildren(SlotVisitor& visitor) 86{ 87 if (TextTrack* textTrack = impl().track()) 88 visitor.addOpaqueRoot(root(textTrack)); 89} 90 91} // namespace WebCore 92 93#endif 94