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