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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
* Copyright (C) 2017-2020 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 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 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)
#include "TextTrackCueList.h"
#include <algorithm>
#include <ranges>
// Checking sorting is too slow for general use; turn it on explicitly when working on this class.
#undef CHECK_SORTING
#ifdef CHECK_SORTING
#define ASSERT_SORTED(range) ASSERT(std::ranges::is_sorted(range, cueSortsBefore))
#else
#define ASSERT_SORTED(range) ((void)0)
#endif
namespace WebCore {
static inline bool cueSortsBefore(const RefPtr<TextTrackCue>& a, const RefPtr<TextTrackCue>& b)
{
if (a->startMediaTime() < b->startMediaTime())
return true;
return a->startMediaTime() == b->startMediaTime() && a->endMediaTime() > b->endMediaTime();
}
Ref<TextTrackCueList> TextTrackCueList::create()
{
return adoptRef(*new TextTrackCueList);
}
void TextTrackCueList::didMoveToNewDocument(Document& newDocument)
{
for (RefPtr cue : m_vector)
cue->didMoveToNewDocument(newDocument);
}
unsigned TextTrackCueList::cueIndex(const TextTrackCue& cue) const
{
ASSERT(m_vector.contains(&cue));
return m_vector.find(&cue);
}
TextTrackCue* TextTrackCueList::item(unsigned index) const
{
if (index >= m_vector.size())
return nullptr;
return m_vector[index].get();
}
TextTrackCue* TextTrackCueList::getCueById(const String& id) const
{
for (auto& cue : m_vector) {
if (cue->id() == id)
return cue.get();
}
return nullptr;
}
TextTrackCueList& TextTrackCueList::activeCues()
{
if (!m_activeCues)
m_activeCues = create();
Vector<RefPtr<TextTrackCue>> activeCuesVector;
for (auto& cue : m_vector) {
if (cue->isActive())
activeCuesVector.append(cue);
}
ASSERT_SORTED(activeCuesVector);
m_activeCues->m_vector = WTFMove(activeCuesVector);
// FIXME: This list of active cues is not updated as cues are added, removed, become active, and become inactive.
// Instead it is only updated each time this function is called again. That is not consistent with other dynamic DOM lists.
return *m_activeCues;
}
void TextTrackCueList::add(Ref<TextTrackCue>&& cue)
{
ASSERT(!m_vector.contains(cue.ptr()));
RefPtr<TextTrackCue> cueRefPtr { WTFMove(cue) };
unsigned insertionPosition = std::ranges::upper_bound(m_vector, cueRefPtr, cueSortsBefore) - m_vector.begin();
ASSERT_SORTED(m_vector);
m_vector.insert(insertionPosition, WTFMove(cueRefPtr));
ASSERT_SORTED(m_vector);
}
void TextTrackCueList::remove(TextTrackCue& cue)
{
ASSERT_SORTED(m_vector);
m_vector.remove(cueIndex(cue));
ASSERT_SORTED(m_vector);
}
void TextTrackCueList::clear()
{
m_vector.clear();
if (m_activeCues)
m_activeCues->m_vector.clear();
}
void TextTrackCueList::updateCueIndex(const TextTrackCue& cue)
{
auto vectorSpan = m_vector.mutableSpan();
auto cueIndex = this->cueIndex(cue);
auto valuesUntilCue = vectorSpan.first(cueIndex);
auto cuePosition = vectorSpan.subspan(cueIndex).begin();
auto valuesAfterCue = vectorSpan.subspan(cueIndex + 1);
ASSERT_SORTED(valuesUntilCue);
ASSERT_SORTED(valuesAfterCue);
auto reinsertionPosition = std::ranges::upper_bound(valuesUntilCue, *cuePosition, cueSortsBefore);
if (std::to_address(reinsertionPosition) != std::to_address(cuePosition))
std::rotate(reinsertionPosition, cuePosition, valuesAfterCue.begin());
else {
reinsertionPosition = std::ranges::upper_bound(valuesAfterCue, *cuePosition, cueSortsBefore);
if (std::to_address(reinsertionPosition) != valuesAfterCue.data())
std::rotate(cuePosition, valuesAfterCue.begin(), reinsertionPosition);
}
ASSERT_SORTED(m_vector);
}
} // namespace WebCore
#endif
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