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/*
* Copyright (C) 2006, 2008 Apple 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 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 "FontDescription.h"
#include <limits.h>
#include <wtf/Forward.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>
#if PLATFORM(IOS)
#include <CoreText/CTFont.h>
#endif
#if OS(WINDOWS)
#include <windows.h>
#include <objidl.h>
#include <mlang.h>
#endif
namespace WebCore {
class Font;
class FontPlatformData;
class FontData;
class FontSelector;
class OpenTypeVerticalData;
class SimpleFontData;
#if PLATFORM(WIN)
#if USE(IMLANG_FONT_LINK2)
typedef IMLangFontLink2 IMLangFontLinkType;
#else
typedef IMLangFontLink IMLangFontLinkType;
#endif
#endif
// This key contains the FontDescription fields other than family that matter when fetching FontDatas (platform fonts).
struct FontDescriptionFontDataCacheKey {
explicit FontDescriptionFontDataCacheKey(unsigned size = 0)
: size(size)
, weight(0)
, flags(0)
{ }
FontDescriptionFontDataCacheKey(const FontDescription& description)
: size(description.computedPixelSize())
, weight(description.weight())
, flags(makeFlagKey(description))
{ }
static unsigned makeFlagKey(const FontDescription& description)
{
return static_cast<unsigned>(description.widthVariant()) << 4
| static_cast<unsigned>(description.orientation()) << 3
| static_cast<unsigned>(description.italic()) << 2
| static_cast<unsigned>(description.usePrinterFont()) << 1
| static_cast<unsigned>(description.renderingMode());
}
bool operator==(const FontDescriptionFontDataCacheKey& other) const
{
return size == other.size && weight == other.weight && flags == other.flags;
}
bool operator!=(const FontDescriptionFontDataCacheKey& other) const
{
return !(*this == other);
}
inline unsigned computeHash() const
{
return StringHasher::hashMemory<sizeof(FontDescriptionFontDataCacheKey)>(this);
}
unsigned size;
unsigned weight;
unsigned flags;
};
class FontCache {
friend class FontCachePurgePreventer;
friend class WTF::NeverDestroyed<FontCache>;
WTF_MAKE_NONCOPYABLE(FontCache); WTF_MAKE_FAST_ALLOCATED;
public:
friend FontCache& fontCache();
enum ShouldRetain { Retain, DoNotRetain };
PassRefPtr<FontData> getFontData(const FontDescription&, int& familyIndex, FontSelector*);
void releaseFontData(const SimpleFontData*);
// This method is implemented by the platform.
PassRefPtr<SimpleFontData> systemFallbackForCharacters(const FontDescription&, const SimpleFontData* originalFontData, bool isPlatformFont, const UChar* characters, int length);
// Also implemented by the platform.
void platformInit();
#if PLATFORM(IOS)
static float weightOfCTFont(CTFontRef);
#endif
#if PLATFORM(WIN)
IMLangFontLinkType* getFontLinkInterface();
static void comInitialize();
static void comUninitialize();
static IMultiLanguage* getMultiLanguageInterface();
#endif
void getTraitsInFamily(const AtomicString&, Vector<unsigned>&);
PassRefPtr<SimpleFontData> getCachedFontData(const FontDescription&, const AtomicString&, bool checkingAlternateName = false, ShouldRetain = Retain);
WEBCORE_EXPORT PassRefPtr<SimpleFontData> getLastResortFallbackFont(const FontDescription&, ShouldRetain = Retain);
SimpleFontData* getNonRetainedLastResortFallbackFont(const FontDescription&);
void addClient(FontSelector*);
void removeClient(FontSelector*);
unsigned short generation();
WEBCORE_EXPORT void invalidate();
WEBCORE_EXPORT size_t fontDataCount();
WEBCORE_EXPORT size_t inactiveFontDataCount();
WEBCORE_EXPORT void purgeInactiveFontData(int count = INT_MAX);
#if PLATFORM(WIN)
PassRefPtr<SimpleFontData> fontDataFromDescriptionAndLogFont(const FontDescription&, ShouldRetain, const LOGFONT&, AtomicString& outFontFamilyName);
#endif
#if ENABLE(OPENTYPE_VERTICAL)
typedef AtomicString FontFileKey;
PassRefPtr<OpenTypeVerticalData> getVerticalData(const FontFileKey&, const FontPlatformData&);
#endif
struct SimpleFontFamily {
String name;
bool isBold;
bool isItalic;
};
static void getFontFamilyForCharacters(const UChar* characters, size_t numCharacters, const char* preferredLocale, SimpleFontFamily*);
private:
FontCache();
~FontCache();
void disablePurging() { m_purgePreventCount++; }
void enablePurging()
{
ASSERT(m_purgePreventCount);
if (!--m_purgePreventCount)
purgeInactiveFontDataIfNeeded();
}
void WEBCORE_EXPORT 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.
#if PLATFORM(IOS)
FontPlatformData* getCustomFallbackFont(const UInt32, const FontDescription&);
PassRefPtr<SimpleFontData> getSystemFontFallbackForCharacters(const FontDescription&, const SimpleFontData*, const UChar* characters, int length);
#endif
PassOwnPtr<FontPlatformData> createFontPlatformData(const FontDescription&, const AtomicString& family);
#if PLATFORM(COCOA)
PassRefPtr<SimpleFontData> similarFontPlatformData(const FontDescription&);
#endif
WEBCORE_EXPORT PassRefPtr<SimpleFontData> getCachedFontData(const FontPlatformData*, ShouldRetain = Retain);
// Don't purge if this count is > 0;
int m_purgePreventCount;
#if PLATFORM(COCOA)
friend class ComplexTextController;
#endif
friend class SimpleFontData; // For getCachedFontData(const FontPlatformData*)
friend class FontGlyphs;
};
// Get the global fontCache.
WEBCORE_EXPORT FontCache& fontCache();
class FontCachePurgePreventer {
public:
FontCachePurgePreventer() { fontCache().disablePurging(); }
~FontCachePurgePreventer() { fontCache().enablePurging(); }
};
}
#endif
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