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/*
* Copyright (C) 2022-2023 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"
#include "GlyphDisplayListCache.h"
#include "DisplayListItems.h"
#include "InlineDisplayBox.h"
#include "LegacyInlineTextBox.h"
namespace WebCore {
struct GlyphDisplayListCacheKey {
const TextRun& textRun;
const FontCascade& font;
GraphicsContext& context;
};
static void add(Hasher& hasher, const GlyphDisplayListCacheKey& key)
{
add(hasher, key.textRun, key.context.scaleFactor().width(), key.context.scaleFactor().height(), key.font.generation(), key.context.shouldSubpixelQuantizeFonts());
}
struct GlyphDisplayListCacheKeyTranslator {
static unsigned hash(const GlyphDisplayListCacheKey& key)
{
return computeHash(key);
}
static bool equal(const SingleThreadWeakRef<GlyphDisplayListCacheEntry>& entryRef, const GlyphDisplayListCacheKey& key)
{
auto& entry = entryRef.get();
return entry.m_textRun == key.textRun
&& entry.m_scaleFactor == key.context.scaleFactor()
&& entry.m_fontCascadeGeneration == key.font.generation()
&& entry.m_shouldSubpixelQuantizeFont == key.context.shouldSubpixelQuantizeFonts();
}
};
GlyphDisplayListCache& GlyphDisplayListCache::singleton()
{
static NeverDestroyed<GlyphDisplayListCache> cache;
return cache;
}
void GlyphDisplayListCache::clear()
{
m_entriesForLayoutRun.clear();
m_entries.clear();
}
unsigned GlyphDisplayListCache::size() const
{
return m_entries.size();
}
template <typename LayoutRun>
DisplayList::DisplayList* GlyphDisplayListCache::getDisplayList(const LayoutRun* run, const FontCascade& font, GraphicsContext& context, const TextRun& textRun)
{
if (MemoryPressureHandler::singleton().isUnderMemoryPressure()) {
if (!m_entries.isEmpty()) {
LOG(MemoryPressure, "GlyphDisplayListCache::%s - Under memory pressure - size: %d", __FUNCTION__, size());
clear();
}
return nullptr;
}
if (font.isLoadingCustomFonts() || !font.fonts())
return nullptr;
if (auto entry = m_entriesForLayoutRun.get(run))
return &entry->displayList();
if (auto entry = m_entries.find<GlyphDisplayListCacheKeyTranslator>(GlyphDisplayListCacheKey { textRun, font, context }); entry != m_entries.end()) {
const_cast<LayoutRun*>(run)->setIsInGlyphDisplayListCache();
return &m_entriesForLayoutRun.add(run, Ref { entry->get() }).iterator->value->displayList();
}
if (auto displayList = font.displayListForTextRun(context, textRun)) {
Ref entry = GlyphDisplayListCacheEntry::create(WTFMove(displayList), textRun, font, context);
if (canShareDisplayList(entry->displayList()))
m_entries.add(entry.get());
const_cast<LayoutRun*>(run)->setIsInGlyphDisplayListCache();
return &m_entriesForLayoutRun.add(run, WTFMove(entry)).iterator->value->displayList();
}
return nullptr;
}
DisplayList::DisplayList* GlyphDisplayListCache::get(const LegacyInlineTextBox& run, const FontCascade& font, GraphicsContext& context, const TextRun& textRun)
{
return getDisplayList(&run, font, context, textRun);
}
DisplayList::DisplayList* GlyphDisplayListCache::get(const InlineDisplay::Box& run, const FontCascade& font, GraphicsContext& context, const TextRun& textRun)
{
return getDisplayList(&run, font, context, textRun);
}
DisplayList::DisplayList* GlyphDisplayListCache::getIfExists(const void* run)
{
if (auto entry = m_entriesForLayoutRun.get(run))
return &entry->displayList();
return nullptr;
}
void GlyphDisplayListCache::remove(const void* run)
{
m_entriesForLayoutRun.remove(run);
}
bool GlyphDisplayListCache::canShareDisplayList(const DisplayList::DisplayList& displayList)
{
for (auto& item : displayList.items()) {
if (!(std::holds_alternative<DisplayList::Translate>(item)
|| std::holds_alternative<DisplayList::Scale>(item)
|| std::holds_alternative<DisplayList::ConcatenateCTM>(item)
|| std::holds_alternative<DisplayList::DrawDecomposedGlyphs>(item)
|| std::holds_alternative<DisplayList::DrawImageBuffer>(item)
|| std::holds_alternative<DisplayList::DrawNativeImage>(item)
|| std::holds_alternative<DisplayList::BeginTransparencyLayer>(item)
|| std::holds_alternative<DisplayList::EndTransparencyLayer>(item)))
return false;
}
return true;
}
GlyphDisplayListCacheEntry::~GlyphDisplayListCacheEntry()
{
GlyphDisplayListCache::singleton().m_entries.remove(this);
}
} // namespace WebCore
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