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
37
38namespace WebCore {
39using namespace JSC;
40
41bool JSTextTrackCueOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, SlotVisitor& visitor, const char** reason)
42{
43 JSTextTrackCue* jsTextTrackCue = jsCast<JSTextTrackCue*>(handle.slot()->asCell());
44 TextTrackCue& textTrackCue = jsTextTrackCue->wrapped();
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 if (UNLIKELY(reason))
50 *reason = "TextTrackCue is firing event listeners";
51 return true;
52 }
53
54 // If the cue is not associated with a track, it is not reachable.
55 if (!textTrackCue.track())
56 return false;
57
58 if (UNLIKELY(reason))
59 *reason = "TextTrack is an opaque root";
60
61 return visitor.containsOpaqueRoot(root(textTrackCue.track()));
62}
63
64JSValue toJSNewlyCreated(ExecState*, JSDOMGlobalObject* globalObject, Ref<TextTrackCue>&& cue)
65{
66 switch (cue->cueType()) {
67 case TextTrackCue::Data:
68 return createWrapper<DataCue>(globalObject, WTFMove(cue));
69 case TextTrackCue::WebVTT:
70 case TextTrackCue::Generic:
71 return createWrapper<VTTCue>(globalObject, WTFMove(cue));
72 default:
73 ASSERT_NOT_REACHED();
74 return jsNull();
75 }
76}
77
78JSValue toJS(ExecState* state, JSDOMGlobalObject* globalObject, TextTrackCue& cue)
79{
80 return wrap(state, globalObject, cue);
81}
82
83void JSTextTrackCue::visitAdditionalChildren(SlotVisitor& visitor)
84{
85 if (TextTrack* textTrack = wrapped().track())
86 visitor.addOpaqueRoot(root(textTrack));
87}
88
89} // namespace WebCore
90
91#endif
92