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/*
* Copyright (C) 2006, 2010, 2013-2015 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.
*
*/
#ifndef FontCascadeFonts_h
#define FontCascadeFonts_h
#include "Font.h"
#include "FontRanges.h"
#include "FontSelector.h"
#include "GlyphPage.h"
#include "WidthCache.h"
#include <wtf/Forward.h>
#include <wtf/MainThread.h>
#if PLATFORM(IOS)
#include "WebCoreThread.h"
#endif
namespace WebCore {
class FontCascadeDescription;
class FontPlatformData;
class FontSelector;
class GraphicsContext;
class IntRect;
class MixedFontGlyphPage;
class FontCascadeFonts : public RefCounted<FontCascadeFonts> {
WTF_MAKE_NONCOPYABLE(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(UChar32, const FontCascadeDescription&, FontVariant);
bool isFixedPitch(const FontCascadeDescription&);
void determinePitch(const FontCascadeDescription&);
bool isLoadingCustomFonts() const;
FontSelector* fontSelector() { 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(UChar32, const FontCascadeDescription&, FontVariant);
GlyphData glyphDataForNormalVariant(UChar32, const FontCascadeDescription&);
GlyphData glyphDataForVariant(UChar32, const FontCascadeDescription&, FontVariant, unsigned fallbackIndex);
Vector<FontRanges, 1> m_realizedFallbackRanges;
unsigned m_lastRealizedFallbackIndex { 0 };
class GlyphPageCacheEntry {
public:
GlyphData glyphDataForCharacter(UChar32);
void setSingleFontPage(RefPtr<GlyphPage>&&);
void setGlyphDataForCharacter(UChar32, 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;
};
GlyphPageCacheEntry m_cachedPageZero;
HashMap<int, GlyphPageCacheEntry> m_cachedPages;
HashSet<RefPtr<Font>> m_systemFallbackFontSet;
const Font* m_cachedPrimaryFont;
RefPtr<FontSelector> m_fontSelector;
WidthCache m_widthCache;
unsigned m_fontSelectorVersion;
unsigned short m_generation;
Pitch m_pitch { UnknownPitch };
bool m_isForPlatformFont { false };
};
inline bool FontCascadeFonts::isFixedPitch(const FontCascadeDescription& description)
{
if (m_pitch == UnknownPitch)
determinePitch(description);
return m_pitch == FixedPitch;
};
inline const Font& FontCascadeFonts::primaryFont(const FontCascadeDescription& description)
{
ASSERT(isMainThread());
if (!m_cachedPrimaryFont) {
auto& primaryRanges = realizeFallbackRangesAt(description, 0);
m_cachedPrimaryFont = primaryRanges.fontForCharacter(' ');
if (!m_cachedPrimaryFont)
m_cachedPrimaryFont = &primaryRanges.fontForFirstRange();
}
return *m_cachedPrimaryFont;
}
}
#endif
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