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/*
* Copyright (C) 2006-2021 Apple Inc. All rights reserved.
* Copyright (C) 2007-2008 Torch Mobile, Inc.
*
* 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE 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 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 "FontCascadeCache.h"
#include "FontCache.h"
#include "FontCascadeDescription.h"
namespace WebCore {
FontFamilyName::FontFamilyName() = default;
FontFamilyName::FontFamilyName(const AtomString& name)
: m_name { name }
{
}
const AtomString& FontFamilyName::string() const
{
return m_name;
}
void add(Hasher& hasher, const FontFamilyName& name)
{
// FIXME: Would be better to hash the characters in the name instead of hashing a hash.
if (!name.string().isNull())
add(hasher, FontCascadeDescription::familyNameHash(name.string()));
}
bool operator==(const FontFamilyName& a, const FontFamilyName& b)
{
return (a.string().isNull() || b.string().isNull()) ? a.string() == b.string() : FontCascadeDescription::familyNamesAreEqual(a.string(), b.string());
}
bool operator==(const FontCascadeCacheKey& a, const FontCascadeCacheKey& b)
{
return a.fontDescriptionKey == b.fontDescriptionKey
&& a.fontSelectorId == b.fontSelectorId
&& a.fontSelectorVersion == b.fontSelectorVersion
&& a.families == b.families;
}
FontCascadeCache& FontCascadeCache::forCurrentThread()
{
return FontCache::forCurrentThread().fontCascadeCache();
}
void FontCascadeCache::invalidate()
{
m_entries.clear();
}
void FontCascadeCache::clearWidthCaches()
{
for (auto& value : m_entries.values())
value->fonts.get().widthCache().clear();
}
void FontCascadeCache::pruneUnreferencedEntries()
{
m_entries.removeIf([](auto& entry) {
return entry.value->fonts.get().hasOneRef();
});
}
void FontCascadeCache::pruneSystemFallbackFonts()
{
for (auto& entry : m_entries.values())
entry->fonts->pruneSystemFallbacks();
}
static FontCascadeCacheKey makeFontCascadeCacheKey(const FontCascadeDescription& description, FontSelector* fontSelector)
{
FontCascadeCacheKey key;
key.fontDescriptionKey = FontDescriptionKey(description);
unsigned familyCount = description.familyCount();
key.families.reserveInitialCapacity(familyCount);
for (unsigned i = 0; i < familyCount; ++i)
key.families.uncheckedAppend(description.familyAt(i));
key.fontSelectorId = fontSelector ? fontSelector->uniqueId() : 0;
key.fontSelectorVersion = fontSelector ? fontSelector->version() : 0;
return key;
}
Ref<FontCascadeFonts> FontCascadeCache::retrieveOrAddCachedFonts(const FontCascadeDescription& fontDescription, RefPtr<FontSelector>&& fontSelector)
{
auto key = makeFontCascadeCacheKey(fontDescription, fontSelector.get());
auto addResult = m_entries.add(key, nullptr);
if (!addResult.isNewEntry)
return addResult.iterator->value->fonts.get();
auto& newEntry = addResult.iterator->value;
newEntry = makeUnique<FontCascadeCacheEntry>(FontCascadeCacheEntry { WTFMove(key), FontCascadeFonts::create(WTFMove(fontSelector)) });
Ref<FontCascadeFonts> glyphs = newEntry->fonts.get();
static constexpr unsigned unreferencedPruneInterval = 50;
static constexpr int maximumEntries = 400;
static unsigned pruneCounter;
// Referenced FontCascadeFonts would exist anyway so pruning them saves little memory.
if (!(++pruneCounter % unreferencedPruneInterval))
pruneUnreferencedEntries();
// Prevent pathological growth.
if (m_entries.size() > maximumEntries)
m_entries.remove(m_entries.random());
return glyphs;
}
} // namespace WebCore
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