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/*
* Copyright (C) 2006-2023 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include "Font.h"
#include "FontCascadeDescription.h"
#include "FontRanges.h"
#include "FontSelector.h"
#include "GlyphPage.h"
#include "WidthCache.h"
#include <wtf/EnumeratedArray.h>
#include <wtf/Forward.h>
#include <wtf/HashFunctions.h>
#include <wtf/HashTraits.h>
#include <wtf/MainThread.h>
#include <wtf/TriState.h>
#if PLATFORM(IOS_FAMILY)
#include "WebCoreThread.h"
#endif
namespace WTF {
class TextStream;
}
namespace WebCore {
class FontPlatformData;
class FontSelector;
class GraphicsContext;
class IntRect;
class MixedFontGlyphPage;
DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(FontCascadeFonts);
class FontCascadeFonts : public RefCounted<FontCascadeFonts> {
WTF_MAKE_NONCOPYABLE(FontCascadeFonts);
WTF_MAKE_FAST_ALLOCATED_WITH_HEAP_IDENTIFIER(FontCascadeFonts);
public:
static Ref<FontCascadeFonts> create(RefPtr<FontSelector>&& fontSelector) { return adoptRef(*new FontCascadeFonts(WTFMove(fontSelector))); }
static Ref<FontCascadeFonts> createForPlatformFont(const FontPlatformData& platformData) { return adoptRef(*new FontCascadeFonts(platformData)); }
WEBCORE_EXPORT ~FontCascadeFonts();
bool isForPlatformFont() const { return m_isForPlatformFont; }
GlyphData glyphDataForCharacter(char32_t, const FontCascadeDescription&, FontVariant, ResolvedEmojiPolicy);
bool isFixedPitch(const FontCascadeDescription&);
bool canTakeFixedPitchFastContentMeasuring(const FontCascadeDescription&);
bool isLoadingCustomFonts() const;
FontSelector* fontSelector() { return m_fontSelector.get(); }
const FontSelector* fontSelector() const { return m_fontSelector.get(); }
// FIXME: It should be possible to combine fontSelectorVersion and generation.
unsigned fontSelectorVersion() const { return m_fontSelectorVersion; }
unsigned generation() const { return m_generation; }
WidthCache& widthCache() { return m_widthCache; }
const WidthCache& widthCache() const { return m_widthCache; }
const Font& primaryFont(const FontCascadeDescription&);
WEBCORE_EXPORT const FontRanges& realizeFallbackRangesAt(const FontCascadeDescription&, unsigned fallbackIndex);
void pruneSystemFallbacks();
private:
FontCascadeFonts(RefPtr<FontSelector>&&);
FontCascadeFonts(const FontPlatformData&);
GlyphData glyphDataForSystemFallback(char32_t, const FontCascadeDescription&, FontVariant, ResolvedEmojiPolicy, bool systemFallbackShouldBeInvisible);
GlyphData glyphDataForVariant(char32_t, const FontCascadeDescription&, FontVariant, ResolvedEmojiPolicy, unsigned fallbackIndex = 0);
WEBCORE_EXPORT void determinePitch(const FontCascadeDescription&);
WEBCORE_EXPORT void determineCanTakeFixedPitchFastContentMeasuring(const FontCascadeDescription&);
Vector<FontRanges, 1> m_realizedFallbackRanges;
unsigned m_lastRealizedFallbackIndex { 0 };
class GlyphPageCacheEntry {
public:
GlyphPageCacheEntry() = default;
GlyphPageCacheEntry(RefPtr<GlyphPage>&&);
GlyphData glyphDataForCharacter(char32_t);
void setSingleFontPage(RefPtr<GlyphPage>&&);
void setGlyphDataForCharacter(char32_t, GlyphData);
bool isNull() const { return !m_singleFont && !m_mixedFont; }
bool isMixedFont() const { return !!m_mixedFont; }
private:
// Only one of these is non-null.
RefPtr<GlyphPage> m_singleFont;
std::unique_ptr<MixedFontGlyphPage> m_mixedFont;
};
EnumeratedArray<ResolvedEmojiPolicy, UncheckedKeyHashMap<unsigned, GlyphPageCacheEntry, IntHash<unsigned>, WTF::UnsignedWithZeroKeyHashTraits<unsigned>>, ResolvedEmojiPolicy::RequireEmoji> m_cachedPages;
UncheckedKeyHashSet<RefPtr<Font>> m_systemFallbackFontSet;
SingleThreadWeakPtr<const Font> m_cachedPrimaryFont;
const RefPtr<FontSelector> m_fontSelector;
WidthCache m_widthCache;
unsigned m_fontSelectorVersion { 0 };
unsigned short m_generation { 0 };
Pitch m_pitch { UnknownPitch };
bool m_isForPlatformFont { false };
TriState m_canTakeFixedPitchFastContentMeasuring : 2 { TriState::Indeterminate };
#if ASSERT_ENABLED
std::optional<Ref<Thread>> m_thread;
#endif
};
inline bool FontCascadeFonts::isFixedPitch(const FontCascadeDescription& description)
{
if (m_pitch == UnknownPitch)
determinePitch(description);
return m_pitch == FixedPitch;
}
inline bool FontCascadeFonts::canTakeFixedPitchFastContentMeasuring(const FontCascadeDescription& description)
{
if (m_canTakeFixedPitchFastContentMeasuring == TriState::Indeterminate)
determineCanTakeFixedPitchFastContentMeasuring(description);
return m_canTakeFixedPitchFastContentMeasuring == TriState::True;
}
inline const Font& FontCascadeFonts::primaryFont(const FontCascadeDescription& description)
{
ASSERT(m_thread ? m_thread->ptr() == &Thread::current() : isMainThread());
if (!m_cachedPrimaryFont) {
auto& primaryRanges = realizeFallbackRangesAt(description, 0);
m_cachedPrimaryFont = primaryRanges.glyphDataForCharacter(' ', ExternalResourceDownloadPolicy::Allow).font.get();
if (!m_cachedPrimaryFont)
m_cachedPrimaryFont = primaryRanges.rangeAt(0).font(ExternalResourceDownloadPolicy::Allow);
else if (m_cachedPrimaryFont->isInterstitial()) {
for (unsigned index = 1; ; ++index) {
auto& localRanges = realizeFallbackRangesAt(description, index);
if (localRanges.isNull())
break;
WeakPtr font = localRanges.glyphDataForCharacter(' ', ExternalResourceDownloadPolicy::Forbid).font.get();
if (font && !font->isInterstitial()) {
m_cachedPrimaryFont = WTFMove(font);
break;
}
}
}
}
ASSERT(m_cachedPrimaryFont);
return *m_cachedPrimaryFont;
}
WTF::TextStream& operator<<(WTF::TextStream&, const FontCascadeFonts&);
} // namespace WebCore
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