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/*
* Copyright (C) 2006, 2008 Apple Computer, 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 Computer, 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.
*/
#ifndef FontCache_h
#define FontCache_h
#include <limits.h>
#include "platform/PlatformExport.h"
#include "wtf/Forward.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"
#include "wtf/text/CString.h"
#include "wtf/text/WTFString.h"
#include "wtf/unicode/Unicode.h"
#if OS(WIN)
#include <windows.h>
#include <objidl.h>
#include <mlang.h>
#endif
#if OS(WIN) && !ENABLE(GDI_FONTS_ON_WINDOWS)
#include "SkFontMgr.h"
#endif
class SkTypeface;
namespace WebCore {
class FontPlatformData;
class FontData;
class FontDescription;
class FontSelector;
class OpenTypeVerticalData;
class SimpleFontData;
enum ShouldRetain { Retain, DoNotRetain };
enum PurgeSeverity { PurgeIfNeeded, ForcePurge };
class PLATFORM_EXPORT FontCache {
friend class FontCachePurgePreventer;
WTF_MAKE_NONCOPYABLE(FontCache); WTF_MAKE_FAST_ALLOCATED;
public:
static FontCache* fontCache();
void releaseFontData(const SimpleFontData*);
// This method is implemented by the plaform and used by
// FontFastPath to lookup the font for a given character.
PassRefPtr<SimpleFontData> platformFallbackForCharacter(const FontDescription&, UChar32, const SimpleFontData* fontDataToSubstitute, bool disallowSynthetics);
// Also implemented by the platform.
void platformInit();
PassRefPtr<SimpleFontData> getFontData(const FontDescription&, const AtomicString&, bool checkingAlternateName = false, ShouldRetain = Retain);
PassRefPtr<SimpleFontData> getLastResortFallbackFont(const FontDescription&, ShouldRetain = Retain);
SimpleFontData* getNonRetainedLastResortFallbackFont(const FontDescription&);
bool isPlatformFontAvailable(const FontDescription&, const AtomicString&);
void addClient(FontSelector*);
void removeClient(FontSelector*);
unsigned short generation();
void invalidate();
#if OS(WIN)
PassRefPtr<SimpleFontData> fontDataFromDescriptionAndLogFont(const FontDescription&, ShouldRetain, const LOGFONT&, wchar_t* outFontFamilyName);
#endif
#if OS(WIN) && !ENABLE(GDI_FONTS_ON_WINDOWS)
bool useSubpixelPositioning() const { return m_useSubpixelPositioning; }
SkFontMgr* fontManager() { return m_fontManager.get(); }
#endif
#if ENABLE(OPENTYPE_VERTICAL)
typedef uint32_t FontFileKey;
PassRefPtr<OpenTypeVerticalData> getVerticalData(const FontFileKey&, const FontPlatformData&);
#endif
#if OS(ANDROID)
static AtomicString getGenericFamilyNameForScript(const AtomicString& familyName, UScriptCode);
#else
struct SimpleFontFamily {
String name;
bool isBold;
bool isItalic;
};
static void getFontFamilyForCharacter(UChar32, const char* preferredLocale, SimpleFontFamily*);
#endif
private:
FontCache();
~FontCache();
void purge(PurgeSeverity = PurgeIfNeeded);
void disablePurging() { m_purgePreventCount++; }
void enablePurging()
{
ASSERT(m_purgePreventCount);
if (!--m_purgePreventCount)
purge(PurgeIfNeeded);
}
// FIXME: This method should eventually be removed.
FontPlatformData* getFontPlatformData(const FontDescription&, const AtomicString& family, bool checkingAlternateName = false);
// These methods are implemented by each platform.
FontPlatformData* createFontPlatformData(const FontDescription&, const AtomicString& family, float fontSize);
// Implemented on skia platforms.
PassRefPtr<SkTypeface> createTypeface(const FontDescription&, const AtomicString& family, CString& name);
PassRefPtr<SimpleFontData> fontDataFromFontPlatformData(const FontPlatformData*, ShouldRetain = Retain);
// Don't purge if this count is > 0;
int m_purgePreventCount;
#if OS(WIN) && !ENABLE(GDI_FONTS_ON_WINDOWS)
OwnPtr<SkFontMgr> m_fontManager;
bool m_useSubpixelPositioning;
#endif
#if OS(MACOSX) || OS(ANDROID)
friend class ComplexTextController;
#endif
friend class SimpleFontData; // For fontDataFromFontPlatformData
friend class FontFallbackList;
};
class PLATFORM_EXPORT FontCachePurgePreventer {
public:
FontCachePurgePreventer() { FontCache::fontCache()->disablePurging(); }
~FontCachePurgePreventer() { FontCache::fontCache()->enablePurging(); }
};
}
#endif
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