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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 <wtf/Forward.h>
#include <wtf/Vector.h>
#include <wtf/unicode/Unicode.h>
#if OS(WINDOWS)
#include <windows.h>
#include <objidl.h>
#include <mlang.h>
#endif
namespace WebCore
{
class Font;
class FontPlatformData;
class FontData;
class FontDescription;
class FontSelector;
class SimpleFontData;
class FontCache {
friend class FontCachePurgePreventer;
WTF_MAKE_NONCOPYABLE(FontCache); WTF_MAKE_FAST_ALLOCATED;
public:
friend FontCache* fontCache();
enum ShouldRetain { Retain, DoNotRetain };
const FontData* getFontData(const Font&, int& familyIndex, FontSelector*);
void releaseFontData(const SimpleFontData*);
// This method is implemented by the platform.
const SimpleFontData* getFontDataForCharacters(const Font&, const UChar* characters, int length);
// Also implemented by the platform.
void platformInit();
#if OS(WINCE) && !PLATFORM(QT)
#if defined(IMLANG_FONT_LINK) && (IMLANG_FONT_LINK == 2)
IMLangFontLink2* getFontLinkInterface();
#else
IMLangFontLink* getFontLinkInterface();
#endif
static void comInitialize();
static void comUninitialize();
static IMultiLanguage* getMultiLanguageInterface();
#elif PLATFORM(WIN)
IMLangFontLink2* getFontLinkInterface();
#endif
void getTraitsInFamily(const AtomicString&, Vector<unsigned>&);
SimpleFontData* getCachedFontData(const FontDescription&, const AtomicString&, bool checkingAlternateName = false, ShouldRetain = Retain);
SimpleFontData* getLastResortFallbackFont(const FontDescription&, ShouldRetain = Retain);
SimpleFontData* getNonRetainedLastResortFallbackFont(const FontDescription&);
void addClient(FontSelector*);
void removeClient(FontSelector*);
unsigned short generation();
void invalidate();
size_t fontDataCount();
size_t inactiveFontDataCount();
void purgeInactiveFontData(int count = INT_MAX);
#if PLATFORM(WIN)
SimpleFontData* fontDataFromDescriptionAndLogFont(const FontDescription&, ShouldRetain, const LOGFONT& font, AtomicString& outFontFamilyName);
#elif PLATFORM(CHROMIUM) && OS(WINDOWS)
SimpleFontData* fontDataFromDescriptionAndLogFont(const FontDescription&, ShouldRetain, const LOGFONT& font, wchar_t* outFontFamilyName);
#endif
private:
FontCache();
~FontCache();
void disablePurging() { m_purgePreventCount++; }
void enablePurging()
{
ASSERT(m_purgePreventCount);
if (!--m_purgePreventCount)
purgeInactiveFontDataIfNeeded();
}
void purgeInactiveFontDataIfNeeded();
// FIXME: This method should eventually be removed.
FontPlatformData* getCachedFontPlatformData(const FontDescription&, const AtomicString& family, bool checkingAlternateName = false);
// These methods are implemented by each platform.
SimpleFontData* getSimilarFontPlatformData(const Font&);
FontPlatformData* createFontPlatformData(const FontDescription&, const AtomicString& family);
SimpleFontData* getCachedFontData(const FontPlatformData*, ShouldRetain = Retain);
// Don't purge if this count is > 0;
int m_purgePreventCount;
friend class SimpleFontData; // For getCachedFontData(const FontPlatformData*)
friend class FontFallbackList;
};
// Get the global fontCache.
FontCache* fontCache();
class FontCachePurgePreventer {
public:
FontCachePurgePreventer() { fontCache()->disablePurging(); }
~FontCachePurgePreventer() { fontCache()->enablePurging(); }
};
}
#endif
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