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      1 /*
      2  * Copyright (C) 2007, 2008, 2011 Apple Inc. All rights reserved.
      3  *           (C) 2007, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      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  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "config.h"
     28 #include "core/css/CSSFontSelector.h"
     29 
     30 #include "RuntimeEnabledFeatures.h"
     31 #include "core/css/CSSFontFace.h"
     32 #include "core/css/CSSFontFaceRule.h"
     33 #include "core/css/CSSFontFaceSource.h"
     34 #include "core/css/CSSSegmentedFontFace.h"
     35 #include "core/css/CSSValueList.h"
     36 #include "core/css/resolver/StyleResolver.h"
     37 #include "core/dom/Document.h"
     38 #include "core/fetch/FontResource.h"
     39 #include "core/fetch/ResourceFetcher.h"
     40 #include "core/loader/FrameLoader.h"
     41 #include "core/frame/Frame.h"
     42 #include "core/frame/Settings.h"
     43 #include "platform/fonts/FontCache.h"
     44 #include "platform/fonts/SimpleFontData.h"
     45 #include "wtf/text/AtomicString.h"
     46 
     47 using namespace std;
     48 
     49 namespace WebCore {
     50 
     51 FontLoader::FontLoader(ResourceFetcher* resourceFetcher)
     52     : m_beginLoadingTimer(this, &FontLoader::beginLoadTimerFired)
     53     , m_resourceFetcher(resourceFetcher)
     54 {
     55 }
     56 
     57 void FontLoader::addFontToBeginLoading(FontResource* fontResource)
     58 {
     59     if (!m_resourceFetcher || !fontResource->stillNeedsLoad())
     60         return;
     61 
     62     m_fontsToBeginLoading.append(fontResource);
     63     // FIXME: Use RequestCountTracker??!!
     64     // Increment the request count now, in order to prevent didFinishLoad from being dispatched
     65     // after this font has been requested but before it began loading. Balanced by
     66     // decrementRequestCount() in beginLoadTimerFired() and in clearDocument().
     67     m_resourceFetcher->incrementRequestCount(fontResource);
     68     m_beginLoadingTimer.startOneShot(0);
     69 }
     70 
     71 void FontLoader::beginLoadTimerFired(Timer<WebCore::FontLoader>*)
     72 {
     73     loadPendingFonts();
     74 }
     75 
     76 void FontLoader::loadPendingFonts()
     77 {
     78     ASSERT(m_resourceFetcher);
     79 
     80     Vector<ResourcePtr<FontResource> > fontsToBeginLoading;
     81     fontsToBeginLoading.swap(m_fontsToBeginLoading);
     82 
     83     for (size_t i = 0; i < fontsToBeginLoading.size(); ++i) {
     84         fontsToBeginLoading[i]->beginLoadIfNeeded(m_resourceFetcher);
     85         // Balances incrementRequestCount() in beginLoadingFontSoon().
     86         m_resourceFetcher->decrementRequestCount(fontsToBeginLoading[i].get());
     87     }
     88 }
     89 
     90 void FontLoader::clearResourceFetcher()
     91 {
     92     if (!m_resourceFetcher) {
     93         ASSERT(m_fontsToBeginLoading.isEmpty());
     94         return;
     95     }
     96 
     97     m_beginLoadingTimer.stop();
     98 
     99     for (size_t i = 0; i < m_fontsToBeginLoading.size(); ++i) {
    100         // Balances incrementRequestCount() in beginLoadingFontSoon().
    101         m_resourceFetcher->decrementRequestCount(m_fontsToBeginLoading[i].get());
    102     }
    103 
    104     m_fontsToBeginLoading.clear();
    105     m_resourceFetcher = 0;
    106 }
    107 
    108 CSSFontSelector::CSSFontSelector(Document* document)
    109     : m_document(document)
    110     , m_fontLoader(document->fetcher())
    111     , m_genericFontFamilySettings(document->frame()->settings()->genericFontFamilySettings())
    112 {
    113     // FIXME: An old comment used to say there was no need to hold a reference to m_document
    114     // because "we are guaranteed to be destroyed before the document". But there does not
    115     // seem to be any such guarantee.
    116 
    117     ASSERT(m_document);
    118     ASSERT(m_document->frame());
    119     FontCache::fontCache()->addClient(this);
    120 }
    121 
    122 CSSFontSelector::~CSSFontSelector()
    123 {
    124     clearDocument();
    125     FontCache::fontCache()->removeClient(this);
    126 }
    127 
    128 void CSSFontSelector::registerForInvalidationCallbacks(FontSelectorClient* client)
    129 {
    130     m_clients.add(client);
    131 }
    132 
    133 void CSSFontSelector::unregisterForInvalidationCallbacks(FontSelectorClient* client)
    134 {
    135     m_clients.remove(client);
    136 }
    137 
    138 void CSSFontSelector::dispatchInvalidationCallbacks()
    139 {
    140     Vector<FontSelectorClient*> clients;
    141     copyToVector(m_clients, clients);
    142     for (size_t i = 0; i < clients.size(); ++i)
    143         clients[i]->fontsNeedUpdate(this);
    144 }
    145 
    146 void CSSFontSelector::fontLoaded()
    147 {
    148     dispatchInvalidationCallbacks();
    149 }
    150 
    151 void CSSFontSelector::fontCacheInvalidated()
    152 {
    153     dispatchInvalidationCallbacks();
    154 }
    155 
    156 void CSSFontSelector::addFontFaceRule(const StyleRuleFontFace* fontFaceRule, PassRefPtr<CSSFontFace> cssFontFace)
    157 {
    158     m_cssSegmentedFontFaceCache.add(this, fontFaceRule, cssFontFace);
    159 }
    160 
    161 void CSSFontSelector::removeFontFaceRule(const StyleRuleFontFace* fontFaceRule)
    162 {
    163     m_cssSegmentedFontFaceCache.remove(fontFaceRule);
    164 }
    165 
    166 static AtomicString familyNameFromSettings(const GenericFontFamilySettings& settings, const FontDescription& fontDescription, const AtomicString& genericFamilyName)
    167 {
    168     UScriptCode script = fontDescription.script();
    169 
    170 #if OS(ANDROID)
    171     if (fontDescription.genericFamily() == FontDescription::StandardFamily && !fontDescription.isSpecifiedFont())
    172         return FontCache::getGenericFamilyNameForScript(FontFamilyNames::webkit_standard, script);
    173 
    174     if (genericFamilyName.startsWith("-webkit-"))
    175         return FontCache::getGenericFamilyNameForScript(genericFamilyName, script);
    176 #else
    177     if (fontDescription.genericFamily() == FontDescription::StandardFamily && !fontDescription.isSpecifiedFont())
    178         return settings.standard(script);
    179     if (genericFamilyName == FontFamilyNames::webkit_serif)
    180         return settings.serif(script);
    181     if (genericFamilyName == FontFamilyNames::webkit_sans_serif)
    182         return settings.sansSerif(script);
    183     if (genericFamilyName == FontFamilyNames::webkit_cursive)
    184         return settings.cursive(script);
    185     if (genericFamilyName == FontFamilyNames::webkit_fantasy)
    186         return settings.fantasy(script);
    187     if (genericFamilyName == FontFamilyNames::webkit_monospace)
    188         return settings.fixed(script);
    189     if (genericFamilyName == FontFamilyNames::webkit_pictograph)
    190         return settings.pictograph(script);
    191     if (genericFamilyName == FontFamilyNames::webkit_standard)
    192         return settings.standard(script);
    193 #endif
    194     return emptyAtom;
    195 }
    196 
    197 PassRefPtr<FontData> CSSFontSelector::getFontData(const FontDescription& fontDescription, const AtomicString& familyName)
    198 {
    199     if (CSSSegmentedFontFace* face = m_cssSegmentedFontFaceCache.get(fontDescription, familyName))
    200         return face->getFontData(fontDescription);
    201 
    202     // Try to return the correct font based off our settings, in case we were handed the generic font family name.
    203     AtomicString settingsFamilyName = familyNameFromSettings(m_genericFontFamilySettings, fontDescription, familyName);
    204     if (settingsFamilyName.isEmpty())
    205         return 0;
    206 
    207     return FontCache::fontCache()->getFontData(fontDescription, settingsFamilyName);
    208 }
    209 
    210 CSSSegmentedFontFace* CSSFontSelector::getFontFace(const FontDescription& fontDescription, const AtomicString& familyName)
    211 {
    212     return m_cssSegmentedFontFaceCache.get(fontDescription, familyName);
    213 }
    214 
    215 void CSSFontSelector::willUseFontData(const FontDescription& fontDescription, const AtomicString& family)
    216 {
    217     CSSSegmentedFontFace* face = getFontFace(fontDescription, family);
    218     if (face)
    219         face->willUseFontData(fontDescription);
    220 }
    221 
    222 void CSSFontSelector::clearDocument()
    223 {
    224     m_fontLoader.clearResourceFetcher();
    225     m_document = 0;
    226 }
    227 
    228 void CSSFontSelector::beginLoadingFontSoon(FontResource* font)
    229 {
    230     m_fontLoader.addFontToBeginLoading(font);
    231 }
    232 
    233 void CSSFontSelector::loadPendingFonts()
    234 {
    235     m_fontLoader.loadPendingFonts();
    236 }
    237 
    238 }
    239