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/*
* Copyright (C) 2006, 2010 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 FontFallbackList_h
#define FontFallbackList_h
#include "platform/fonts/FontSelector.h"
#include "platform/fonts/SimpleFontData.h"
#include "platform/fonts/WidthCache.h"
#include "wtf/Forward.h"
#include "wtf/MainThread.h"
namespace WebCore {
class GlyphPageTreeNode;
class GraphicsContext;
class IntRect;
class FontDescription;
class FontPlatformData;
class FontSelector;
const int cAllFamiliesScanned = -1;
class PLATFORM_EXPORT FontFallbackList : public RefCounted<FontFallbackList> {
WTF_MAKE_NONCOPYABLE(FontFallbackList);
public:
typedef HashMap<int, GlyphPageTreeNode*, DefaultHash<int>::Hash> GlyphPages;
class GlyphPagesStateSaver {
public:
GlyphPagesStateSaver(FontFallbackList& fallbackList)
: m_fallbackList(fallbackList)
, m_pages(fallbackList.m_pages)
, m_pageZero(fallbackList.m_pageZero)
{
}
~GlyphPagesStateSaver()
{
m_fallbackList.m_pages = m_pages;
m_fallbackList.m_pageZero = m_pageZero;
}
private:
FontFallbackList& m_fallbackList;
GlyphPages& m_pages;
GlyphPageTreeNode* m_pageZero;
};
static PassRefPtr<FontFallbackList> create() { return adoptRef(new FontFallbackList()); }
~FontFallbackList() { releaseFontData(); }
void invalidate(PassRefPtr<FontSelector>);
bool isFixedPitch(const FontDescription& fontDescription) const
{
if (m_pitch == UnknownPitch)
determinePitch(fontDescription);
return m_pitch == FixedPitch;
}
void determinePitch(const FontDescription&) const;
bool loadingCustomFonts() 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() const { return m_widthCache; }
private:
FontFallbackList();
const SimpleFontData* primarySimpleFontData(const FontDescription& fontDescription)
{
ASSERT(isMainThread());
if (!m_cachedPrimarySimpleFontData)
m_cachedPrimarySimpleFontData = primaryFontData(fontDescription)->fontDataForCharacter(' ');
return m_cachedPrimarySimpleFontData;
}
PassRefPtr<FontData> getFontData(const FontDescription&, int& familyIndex) const;
const FontData* primaryFontData(const FontDescription&) const;
const FontData* fontDataAt(const FontDescription&, unsigned index) const;
void setPlatformFont(const FontPlatformData&);
void releaseFontData();
mutable Vector<RefPtr<FontData>, 1> m_fontList;
mutable GlyphPages m_pages;
mutable GlyphPageTreeNode* m_pageZero;
mutable const SimpleFontData* m_cachedPrimarySimpleFontData;
RefPtr<FontSelector> m_fontSelector;
mutable WidthCache m_widthCache;
unsigned m_fontSelectorVersion;
mutable int m_familyIndex;
unsigned short m_generation;
mutable unsigned m_pitch : 3; // Pitch
mutable bool m_loadingCustomFonts : 1;
friend class Font;
};
}
#endif
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