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/*
* Copyright (C) 2024 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. AND ITS CONTRIBUTORS ``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 ITS 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"
#include "TextBreakingPositionCache.h"
#include "RenderStyle.h"
#include "RenderStyleInlines.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
namespace Layout {
WTF_MAKE_TZONE_ALLOCATED_IMPL(TextBreakingPositionCache);
static constexpr size_t evictionSoftThreshold = 500000; // At this amount of content (string + breaking position list) we should start evicting
static constexpr size_t evictionHardCapMultiplier = 5; // Do not let the cache grow beyond this
static constexpr Seconds idleIntervalForEviction { 10_s };
TextBreakingPositionCache& TextBreakingPositionCache::singleton()
{
static NeverDestroyed<TextBreakingPositionCache> cache;
return cache.get();
}
TextBreakingPositionCache::TextBreakingPositionCache()
: m_delayedEvictionTimer([this] { evict(); })
{
}
void TextBreakingPositionCache::evict()
{
while (m_cachedContentSize > evictionSoftThreshold && !m_breakingPositionMap.isEmpty()) {
auto evictedEntry = m_breakingPositionMap.random();
m_cachedContentSize -= (std::get<0>(evictedEntry->key).length() + 4 * evictedEntry->value.size());
m_breakingPositionMap.remove(evictedEntry->key);
}
}
void TextBreakingPositionCache::set(const Key& key, List&& breakingPositionList)
{
ASSERT(!m_breakingPositionMap.contains(key));
auto evictIfNeeded = [&] {
if (m_cachedContentSize < evictionSoftThreshold)
return;
ASSERT(!m_breakingPositionMap.isEmpty());
auto isBelowHardThreshold = m_cachedContentSize < evictionSoftThreshold * evictionHardCapMultiplier;
if (isBelowHardThreshold) {
m_delayedEvictionTimer.startOneShot(idleIntervalForEviction);
return;
}
evict();
};
evictIfNeeded();
m_cachedContentSize += (std::get<0>(key).length() + 4 * breakingPositionList.size());
m_breakingPositionMap.set(key, WTFMove(breakingPositionList));
}
const TextBreakingPositionCache::List* TextBreakingPositionCache::get(const Key& key) const
{
auto iterator = m_breakingPositionMap.find(key);
if (iterator == m_breakingPositionMap.end())
return { };
return &iterator->value;
}
void TextBreakingPositionCache::clear()
{
m_breakingPositionMap.clear();
m_cachedContentSize = 0;
}
void add(Hasher& hasher, const TextBreakingPositionContext& context)
{
add(hasher, context.whitespaceCollapseBehavior, context.overflowWrap, context.lineBreak, context.wordBreak, context.nbspMode, context.locale);
}
}
}
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