third_party/WebKit/Source/core/css/CSSFontFace.cpp

   1 /*
   2  * Copyright (C) 2007, 2008, 2011 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "core/css/CSSFontFace.h"
  28
  29 #include "core/css/CSSFontFaceSource.h"
  30 #include "core/css/CSSFontSelector.h"
  31 #include "core/css/CSSSegmentedFontFace.h"
  32 #include "core/css/FontFaceSet.h"
  33 #include "core/css/RemoteFontFaceSource.h"
  34 #include "core/frame/UseCounter.h"
  35 #include "platform/fonts/FontDescription.h"
  36 #include "platform/fonts/SimpleFontData.h"
  37
  38 namespace blink {
  39
  40 void CSSFontFace::addSource(PassOwnPtrWillBeRawPtr<CSSFontFaceSource> source)
  41 {
  42     source->setFontFace(this);
  43     m_sources.append(source);
  44 }
  45
  46 void CSSFontFace::setSegmentedFontFace(CSSSegmentedFontFace* segmentedFontFace)
  47 {
  48     ASSERT(!m_segmentedFontFace);
  49     m_segmentedFontFace = segmentedFontFace;
  50 }
  51
  52 void CSSFontFace::didBeginLoad()
  53 {
  54     if (loadStatus() == FontFace::Unloaded)
  55         setLoadStatus(FontFace::Loading);
  56 }
  57
  58 void CSSFontFace::fontLoaded(RemoteFontFaceSource* source)
  59 {
  60     if (!isValid() || source != m_sources.first())
  61         return;
  62
  63     if (loadStatus() == FontFace::Loading) {
  64         if (source->isValid()) {
  65             setLoadStatus(FontFace::Loaded);
  66         } else {
  67             m_sources.removeFirst();
  68             load();
  69         }
  70     }
  71
  72     if (m_segmentedFontFace)
  73         m_segmentedFontFace->fontLoaded(this);
  74 }
  75
  76 void CSSFontFace::fontLoadWaitLimitExceeded(RemoteFontFaceSource* source)
  77 {
  78     if (!isValid() || source != m_sources.first())
  79         return;
  80     if (m_segmentedFontFace)
  81         m_segmentedFontFace->fontLoadWaitLimitExceeded(this);
  82 }
  83
  84 PassRefPtr<SimpleFontData> CSSFontFace::getFontData(const FontDescription& fontDescription)
  85 {
  86     if (!isValid())
  87         return nullptr;
  88
  89     while (!m_sources.isEmpty()) {
  90         OwnPtrWillBeMember<CSSFontFaceSource>& source = m_sources.first();
  91         if (RefPtr<SimpleFontData> result = source->getFontData(fontDescription)) {
  92             if (loadStatus() == FontFace::Unloaded && (source->isLoading() || source->isLoaded()))
  93                 setLoadStatus(FontFace::Loading);
  94             if (loadStatus() == FontFace::Loading && source->isLoaded())
  95                 setLoadStatus(FontFace::Loaded);
  96             return result.release();
  97         }
  98         m_sources.removeFirst();
  99     }
 100
 101     if (loadStatus() == FontFace::Unloaded)
 102         setLoadStatus(FontFace::Loading);
 103     if (loadStatus() == FontFace::Loading)
 104         setLoadStatus(FontFace::Error);
 105     return nullptr;
 106 }
 107
 108 bool CSSFontFace::maybeScheduleFontLoad(const FontDescription& fontDescription, UChar32 character)
 109 {
 110     if (m_ranges.contains(character)) {
 111         if (loadStatus() == FontFace::Unloaded)
 112             load(fontDescription);
 113         return true;
 114     }
 115     return false;
 116 }
 117
 118 void CSSFontFace::load()
 119 {
 120     FontDescription fontDescription;
 121     FontFamily fontFamily;
 122     fontFamily.setFamily(m_fontFace->family());
 123     fontDescription.setFamily(fontFamily);
 124     fontDescription.setTraits(m_fontFace->traits());
 125     load(fontDescription);
 126 }
 127
 128 void CSSFontFace::load(const FontDescription& fontDescription)
 129 {
 130     if (loadStatus() == FontFace::Unloaded)
 131         setLoadStatus(FontFace::Loading);
 132     ASSERT(loadStatus() == FontFace::Loading);
 133
 134     while (!m_sources.isEmpty()) {
 135         OwnPtrWillBeMember<CSSFontFaceSource>& source = m_sources.first();
 136         if (source->isValid()) {
 137             if (source->isLocal()) {
 138                 if (source->isLocalFontAvailable(fontDescription)) {
 139                     setLoadStatus(FontFace::Loaded);
 140                     return;
 141                 }
 142             } else {
 143                 if (!source->isLoaded())
 144                     source->beginLoadIfNeeded();
 145                 else
 146                     setLoadStatus(FontFace::Loaded);
 147                 return;
 148             }
 149         }
 150         m_sources.removeFirst();
 151     }
 152     setLoadStatus(FontFace::Error);
 153 }
 154
 155 void CSSFontFace::setLoadStatus(FontFace::LoadStatus newStatus)
 156 {
 157     ASSERT(m_fontFace);
 158     if (newStatus == FontFace::Error)
 159         m_fontFace->setError();
 160     else
 161         m_fontFace->setLoadStatus(newStatus);
 162
 163     if (!m_segmentedFontFace)
 164         return;
 165     Document* document = m_segmentedFontFace->fontSelector()->document();
 166     if (!document)
 167         return;
 168
 169     switch (newStatus) {
 170     case FontFace::Loading:
 171         FontFaceSet::from(*document)->beginFontLoading(m_fontFace);
 172         break;
 173     case FontFace::Loaded:
 174         FontFaceSet::from(*document)->fontLoaded(m_fontFace);
 175         break;
 176     case FontFace::Error:
 177         FontFaceSet::from(*document)->loadError(m_fontFace);
 178         break;
 179     default:
 180         break;
 181     }
 182 }
 183
 184 CSSFontFace::UnicodeRangeSet::UnicodeRangeSet(const Vector<UnicodeRange>& ranges)
 185     : m_ranges(ranges)
 186 {
 187     if (m_ranges.isEmpty())
 188         return;
 189
 190     std::sort(m_ranges.begin(), m_ranges.end());
 191
 192     // Unify overlapping ranges.
 193     UChar32 from = m_ranges[0].from();
 194     UChar32 to = m_ranges[0].to();
 195     size_t targetIndex = 0;
 196     for (size_t i = 1; i < m_ranges.size(); i++) {
 197         if (to + 1 >= m_ranges[i].from()) {
 198             to = std::max(to, m_ranges[i].to());
 199         } else {
 200             m_ranges[targetIndex++] = UnicodeRange(from, to);
 201             from = m_ranges[i].from();
 202             to = m_ranges[i].to();
 203         }
 204     }
 205     m_ranges[targetIndex++] = UnicodeRange(from, to);
 206     m_ranges.shrink(targetIndex);
 207 }
 208
 209 bool CSSFontFace::UnicodeRangeSet::contains(UChar32 c) const
 210 {
 211     if (isEntireRange())
 212         return true;
 213     Vector<UnicodeRange>::const_iterator it = std::lower_bound(m_ranges.begin(), m_ranges.end(), c);
 214     return it != m_ranges.end() && it->contains(c);
 215 }
 216
 217 bool CSSFontFace::UnicodeRangeSet::intersectsWith(const String& text) const
 218 {
 219     if (text.isEmpty())
 220         return false;
 221     if (isEntireRange())
 222         return true;
 223     if (text.is8Bit() && m_ranges[0].from() >= 0x100)
 224         return false;
 225
 226     unsigned index = 0;
 227     while (index < text.length()) {
 228         UChar32 c = text.characterStartingAt(index);
 229         index += U16_LENGTH(c);
 230         if (contains(c))
 231             return true;
 232     }
 233     return false;
 234 }
 235
 236 DEFINE_TRACE(CSSFontFace)
 237 {
 238     visitor->trace(m_segmentedFontFace);
 239     visitor->trace(m_sources);
 240     visitor->trace(m_fontFace);
 241 }
 242
 243 }