1/* 2 * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved. 3 * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 15 * its contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 21 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30#import "config.h" 31#import "FontCache.h" 32 33#import "Font.h" 34#import "SimpleFontData.h" 35#import "FontPlatformData.h" 36#import "WebCoreSystemInterface.h" 37#import "WebFontCache.h" 38#import <AppKit/AppKit.h> 39#import <wtf/MainThread.h> 40#import <wtf/StdLibExtras.h> 41 42 43namespace WebCore { 44 45// The "void*" parameter makes the function match the prototype for callbacks from callOnMainThread. 46static void invalidateFontCache(void*) 47{ 48 if (!isMainThread()) { 49 callOnMainThread(&invalidateFontCache, 0); 50 return; 51 } 52 fontCache()->invalidate(); 53} 54 55static void fontCacheRegisteredFontsChangedNotificationCallback(CFNotificationCenterRef, void* observer, CFStringRef name, const void *, CFDictionaryRef) 56{ 57 ASSERT_UNUSED(observer, observer == fontCache()); 58 ASSERT_UNUSED(name, CFEqual(name, kCTFontManagerRegisteredFontsChangedNotification)); 59 invalidateFontCache(0); 60} 61 62void FontCache::platformInit() 63{ 64 wkSetUpFontCache(); 65 CFNotificationCenterAddObserver(CFNotificationCenterGetLocalCenter(), this, fontCacheRegisteredFontsChangedNotificationCallback, kCTFontManagerRegisteredFontsChangedNotification, 0, CFNotificationSuspensionBehaviorDeliverImmediately); 66} 67 68static int toAppKitFontWeight(FontWeight fontWeight) 69{ 70 static int appKitFontWeights[] = { 71 2, // FontWeight100 72 3, // FontWeight200 73 4, // FontWeight300 74 5, // FontWeight400 75 6, // FontWeight500 76 8, // FontWeight600 77 9, // FontWeight700 78 10, // FontWeight800 79 12, // FontWeight900 80 }; 81 return appKitFontWeights[fontWeight]; 82} 83 84static inline bool isAppKitFontWeightBold(NSInteger appKitFontWeight) 85{ 86 return appKitFontWeight >= 7; 87} 88 89PassRefPtr<SimpleFontData> FontCache::systemFallbackForCharacters(const FontDescription& description, const SimpleFontData* originalFontData, bool isPlatformFont, const UChar* characters, int length) 90{ 91 UChar32 character; 92 U16_GET(characters, 0, 0, length, character); 93 const FontPlatformData& platformData = originalFontData->platformData(); 94 NSFont *nsFont = platformData.font(); 95 96 NSString *string = [[NSString alloc] initWithCharactersNoCopy:const_cast<UChar*>(characters) length:length freeWhenDone:NO]; 97 NSFont *substituteFont = wkGetFontInLanguageForRange(nsFont, string, NSMakeRange(0, length)); 98 [string release]; 99 100 if (!substituteFont && length == 1) 101 substituteFont = wkGetFontInLanguageForCharacter(nsFont, characters[0]); 102 if (!substituteFont) 103 return 0; 104 105 // Use the family name from the AppKit-supplied substitute font, requesting the 106 // traits, weight, and size we want. One way this does better than the original 107 // AppKit request is that it takes synthetic bold and oblique into account. 108 // But it does create the possibility that we could end up with a font that 109 // doesn't actually cover the characters we need. 110 111 NSFontManager *fontManager = [NSFontManager sharedFontManager]; 112 113 NSFontTraitMask traits; 114 NSInteger weight; 115 CGFloat size; 116 117 if (nsFont) { 118 traits = [fontManager traitsOfFont:nsFont]; 119 if (platformData.m_syntheticBold) 120 traits |= NSBoldFontMask; 121 if (platformData.m_syntheticOblique) 122 traits |= NSFontItalicTrait; 123 weight = [fontManager weightOfFont:nsFont]; 124 size = [nsFont pointSize]; 125 } else { 126 // For custom fonts nsFont is nil. 127 traits = description.italic() ? NSFontItalicTrait : 0; 128 weight = toAppKitFontWeight(description.weight()); 129 size = description.computedPixelSize(); 130 } 131 132 NSFontTraitMask substituteFontTraits = [fontManager traitsOfFont:substituteFont]; 133 NSInteger substituteFontWeight = [fontManager weightOfFont:substituteFont]; 134 135 if (traits != substituteFontTraits || weight != substituteFontWeight || !nsFont) { 136 if (NSFont *bestVariation = [fontManager fontWithFamily:[substituteFont familyName] traits:traits weight:weight size:size]) { 137 if (!nsFont || (([fontManager traitsOfFont:bestVariation] != substituteFontTraits || [fontManager weightOfFont:bestVariation] != substituteFontWeight) 138 && [[bestVariation coveredCharacterSet] longCharacterIsMember:character])) 139 substituteFont = bestVariation; 140 } 141 } 142 143 substituteFont = description.usePrinterFont() ? [substituteFont printerFont] : [substituteFont screenFont]; 144 145 substituteFontTraits = [fontManager traitsOfFont:substituteFont]; 146 substituteFontWeight = [fontManager weightOfFont:substituteFont]; 147 148 FontPlatformData alternateFont(substituteFont, platformData.size(), platformData.isPrinterFont(), 149 !isPlatformFont && isAppKitFontWeightBold(weight) && !isAppKitFontWeightBold(substituteFontWeight), 150 !isPlatformFont && (traits & NSFontItalicTrait) && !(substituteFontTraits & NSFontItalicTrait), 151 platformData.m_orientation); 152 153 return getCachedFontData(&alternateFont, DoNotRetain); 154} 155 156PassRefPtr<SimpleFontData> FontCache::similarFontPlatformData(const FontDescription& description) 157{ 158 // Attempt to find an appropriate font using a match based on 159 // the presence of keywords in the the requested names. For example, we'll 160 // match any name that contains "Arabic" to Geeza Pro. 161 RefPtr<SimpleFontData> simpleFontData; 162 for (unsigned i = 0; i < description.familyCount(); ++i) { 163 const AtomicString& family = description.familyAt(i); 164 if (family.isEmpty()) 165 continue; 166 static String* matchWords[3] = { new String("Arabic"), new String("Pashto"), new String("Urdu") }; 167 DEFINE_STATIC_LOCAL(AtomicString, geezaStr, ("Geeza Pro", AtomicString::ConstructFromLiteral)); 168 for (int j = 0; j < 3 && !simpleFontData; ++j) 169 if (family.contains(*matchWords[j], false)) 170 simpleFontData = getCachedFontData(description, geezaStr); 171 } 172 return simpleFontData.release(); 173} 174 175PassRefPtr<SimpleFontData> FontCache::getLastResortFallbackFont(const FontDescription& fontDescription, ShouldRetain shouldRetain) 176{ 177 DEFINE_STATIC_LOCAL(AtomicString, timesStr, ("Times", AtomicString::ConstructFromLiteral)); 178 179 // FIXME: Would be even better to somehow get the user's default font here. For now we'll pick 180 // the default that the user would get without changing any prefs. 181 RefPtr<SimpleFontData> simpleFontData = getCachedFontData(fontDescription, timesStr, false, shouldRetain); 182 if (simpleFontData) 183 return simpleFontData.release(); 184 185 // The Times fallback will almost always work, but in the highly unusual case where 186 // the user doesn't have it, we fall back on Lucida Grande because that's 187 // guaranteed to be there, according to Nathan Taylor. This is good enough 188 // to avoid a crash at least. 189 DEFINE_STATIC_LOCAL(AtomicString, lucidaGrandeStr, ("Lucida Grande", AtomicString::ConstructFromLiteral)); 190 return getCachedFontData(fontDescription, lucidaGrandeStr, false, shouldRetain); 191} 192 193void FontCache::getTraitsInFamily(const AtomicString& familyName, Vector<unsigned>& traitsMasks) 194{ 195 [WebFontCache getTraits:traitsMasks inFamily:familyName]; 196} 197 198PassOwnPtr<FontPlatformData> FontCache::createFontPlatformData(const FontDescription& fontDescription, const AtomicString& family) 199{ 200 NSFontTraitMask traits = fontDescription.italic() ? NSFontItalicTrait : 0; 201 NSInteger weight = toAppKitFontWeight(fontDescription.weight()); 202 float size = fontDescription.computedPixelSize(); 203 204 NSFont *nsFont = [WebFontCache fontWithFamily:family traits:traits weight:weight size:size]; 205 if (!nsFont) 206 return nullptr; 207 208 NSFontManager *fontManager = [NSFontManager sharedFontManager]; 209 NSFontTraitMask actualTraits = 0; 210 if (fontDescription.italic()) 211 actualTraits = [fontManager traitsOfFont:nsFont]; 212 NSInteger actualWeight = [fontManager weightOfFont:nsFont]; 213 214 NSFont *platformFont = fontDescription.usePrinterFont() ? [nsFont printerFont] : [nsFont screenFont]; 215 bool syntheticBold = isAppKitFontWeightBold(weight) && !isAppKitFontWeightBold(actualWeight); 216 bool syntheticOblique = (traits & NSFontItalicTrait) && !(actualTraits & NSFontItalicTrait); 217 218 OwnPtr<FontPlatformData> platformData = adoptPtr(new FontPlatformData(platformFont, size, fontDescription.usePrinterFont(), syntheticBold, syntheticOblique, fontDescription.orientation(), fontDescription.widthVariant())); 219 return platformData.release(); 220} 221 222} // namespace WebCore 223