author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:28:30 +0100 | |
branch | RCL_3 |
changeset 94 | 919f36ff910f |
parent 93 | 79859ed3eea9 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (C) 2006 Apple Computer, Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
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* its contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#include "FontCache.h" |
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#include "Font.h" |
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#include "FontFallbackList.h" |
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#include "FontPlatformData.h" |
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#include "StringHash.h" |
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#include "staticobjectscontainer.h" |
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#include <wtf/HashMap.h> |
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namespace WebCore { |
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struct FontPlatformDataCacheKey { |
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FontPlatformDataCacheKey(const AtomicString& family = AtomicString(), unsigned size = 0, bool bold = false, bool italic = false, |
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bool isPrinterFont = false) |
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: m_family(family) |
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, m_size(size) |
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, m_bold(bold) |
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, m_italic(italic) |
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, m_printerFont(isPrinterFont) |
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{ |
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} |
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bool operator==(const FontPlatformDataCacheKey& other) const |
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{ |
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return equalIgnoringCase(m_family, other.m_family) && m_size == other.m_size && |
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m_bold == other.m_bold && m_italic == other.m_italic && m_printerFont == other.m_printerFont; |
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} |
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AtomicString m_family; |
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unsigned m_size; |
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bool m_bold; |
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bool m_italic; |
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bool m_printerFont; |
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}; |
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inline unsigned computeHash(const FontPlatformDataCacheKey& fontKey) |
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{ |
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unsigned hashCodes[3] = { |
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CaseInsensitiveHash<String>::hash(fontKey.m_family), |
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fontKey.m_size, |
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static_cast<unsigned>(fontKey.m_bold) << 2 | static_cast<unsigned>(fontKey.m_italic) << 1 | static_cast<unsigned>(fontKey.m_printerFont) |
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}; |
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return StringImpl::computeHash(reinterpret_cast<UChar*>(hashCodes), 3 * sizeof(unsigned) / sizeof(UChar)); |
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} |
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struct FontPlatformDataCacheKeyHash { |
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static unsigned hash(const FontPlatformDataCacheKey& font) |
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{ |
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return computeHash(font); |
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} |
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static bool equal(const FontPlatformDataCacheKey& a, const FontPlatformDataCacheKey& b) |
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{ |
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return a == b; |
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} |
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}; |
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struct FontPlatformDataCacheKeyTraits : WTF::GenericHashTraits<FontPlatformDataCacheKey> { |
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static const bool emptyValueIsZero = true; |
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static const bool needsDestruction = false; |
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static const FontPlatformDataCacheKey& deletedValue() |
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{ |
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static FontPlatformDataCacheKey key(nullAtom, 0xFFFFFFFFU, false, false); |
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return key; |
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} |
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static const FontPlatformDataCacheKey& emptyValue() |
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{ |
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static FontPlatformDataCacheKey key(nullAtom, 0, false, false); |
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return key; |
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} |
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}; |
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typedef HashMap<FontPlatformDataCacheKey, FontPlatformData*, FontPlatformDataCacheKeyHash, FontPlatformDataCacheKeyTraits> FontPlatformDataCache; |
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typedef HashMap<FontPlatformDataCacheKey, FontPlatformData*, FontPlatformDataCacheKeyHash, FontPlatformDataCacheKeyTraits>::iterator FontPlatformDataCacheIterator; |
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static FontPlatformDataCache* gFontPlatformDataCache = 0; |
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void cleanupFontDataCache() |
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108 |
{ |
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if( gFontPlatformDataCache ) |
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110 |
{ |
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FontPlatformDataCacheIterator end = gFontPlatformDataCache->end(); |
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for (FontPlatformDataCacheIterator it = gFontPlatformDataCache->begin(); it != end; ++it) |
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113 |
{ |
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FontPlatformData* obj = (*it).second; |
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delete obj; |
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} |
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gFontPlatformDataCache->clear(); |
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delete gFontPlatformDataCache; |
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gFontPlatformDataCache=0; |
13 | 120 |
} |
16
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} |
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|
0
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static const AtomicString& alternateFamilyName(const AtomicString& familyName) |
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124 |
{ |
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#if PLATFORM(SYMBIAN) |
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return FontCache::systemFontFamilyName( familyName ); |
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#else |
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// Alias Courier <-> Courier New |
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static AtomicString courier("Courier"), courierNew("Courier New"); |
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if (equalIgnoringCase(familyName, courier)) |
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return courierNew; |
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if (equalIgnoringCase(familyName, courierNew)) |
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return courier; |
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134 |
|
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135 |
// Alias Times and Times New Roman. |
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static AtomicString times("Times"), timesNewRoman("Times New Roman"); |
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if (equalIgnoringCase(familyName, times)) |
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return timesNewRoman; |
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139 |
if (equalIgnoringCase(familyName, timesNewRoman)) |
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return times; |
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141 |
|
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142 |
// Alias Arial and Helvetica |
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static AtomicString arial("Arial"), helvetica("Helvetica"); |
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if (equalIgnoringCase(familyName, arial)) |
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return helvetica; |
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if (equalIgnoringCase(familyName, helvetica)) |
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return arial; |
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148 |
|
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return emptyAtom; |
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#endif |
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151 |
} |
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152 |
|
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FontPlatformData* FontCache::getCachedFontPlatformData(const FontDescription& fontDescription, |
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const AtomicString& familyName, |
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bool checkingAlternateName) |
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156 |
{ |
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if (!gFontPlatformDataCache) { |
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gFontPlatformDataCache = new FontPlatformDataCache; |
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} |
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160 |
|
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FontPlatformDataCacheKey key(familyName, fontDescription.computedPixelSize(), fontDescription.bold(), fontDescription.italic(), |
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fontDescription.usePrinterFont()); |
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FontPlatformData* result = 0; |
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bool foundResult; |
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FontPlatformDataCache::iterator it = gFontPlatformDataCache->find(key); |
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if (it == gFontPlatformDataCache->end()) { |
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result = createFontPlatformData(fontDescription, familyName); |
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gFontPlatformDataCache->set(key, result); |
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foundResult = result; |
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170 |
} else { |
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result = it->second; |
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foundResult = true; |
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173 |
} |
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174 |
|
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175 |
if (!foundResult && !checkingAlternateName) { |
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176 |
// We were unable to find a font. We have a small set of fonts that we alias to other names, |
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177 |
// e.g., Arial/Helvetica, Courier/Courier New, etc. Try looking up the font under the aliased name. |
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const AtomicString& alternateName = alternateFamilyName(familyName); |
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179 |
if (!alternateName.isEmpty()) |
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result = getCachedFontPlatformData(fontDescription, alternateName, true); |
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181 |
if (result) |
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182 |
gFontPlatformDataCache->set(key, new FontPlatformData(*result)); // Cache the result under the old name. |
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183 |
} |
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184 |
|
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key.m_family = AtomicString(); |
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186 |
return result; |
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187 |
} |
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188 |
|
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189 |
struct FontDataCacheKeyHash { |
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static unsigned hash(const FontPlatformData& platformData) |
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191 |
{ |
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return platformData.hash(); |
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193 |
} |
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194 |
|
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static bool equal(const FontPlatformData& a, const FontPlatformData& b) |
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196 |
{ |
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return a == b; |
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198 |
} |
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199 |
}; |
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200 |
|
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struct FontDataCacheKeyTraits : WTF::GenericHashTraits<FontPlatformData> { |
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202 |
static const bool emptyValueIsZero = true; |
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static const bool needsDestruction = false; |
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static const FontPlatformData& deletedValue() |
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205 |
{ |
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206 |
static FontPlatformData key = FontPlatformData::Deleted(); |
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return key; |
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208 |
} |
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209 |
static const FontPlatformData& emptyValue() |
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210 |
{ |
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static FontPlatformData key; |
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return key; |
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213 |
} |
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214 |
}; |
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|
215 |
|
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216 |
typedef HashMap<FontPlatformData, FontData*, FontDataCacheKeyHash, FontDataCacheKeyTraits> FontDataCache; |
13 | 217 |
typedef HashMap<FontPlatformData, FontData*, FontDataCacheKeyHash, FontDataCacheKeyTraits>::iterator FontDataCacheIterator; |
0
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218 |
static FontDataCache* gFontDataCache = 0; |
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FontData* FontCache::getCachedFontData(const FontPlatformData* platformData) |
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{ |
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if (!platformData) |
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return 0; |
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if (!gFontDataCache) |
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gFontDataCache = new FontDataCache; |
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FontData* result = gFontDataCache->get(*platformData); |
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if (!result) { |
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result = new FontData(*platformData); |
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gFontDataCache->set(*platformData, result); |
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} |
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return result; |
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} |
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void FontCache::deleteFontDataCache() |
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{ |
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if( gFontDataCache ) { |
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FontDataCacheIterator end = gFontDataCache->end(); |
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for (FontDataCacheIterator it = gFontDataCache->begin(); it != end; ++it) { |
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FontData* obj = (*it).second; |
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delete obj; |
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} |
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} |
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delete gFontDataCache; |
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gFontDataCache = NULL; |
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} |
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0
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const FontData* FontCache::getFontData(const Font& font, int& familyIndex) |
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{ |
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FontPlatformData* result = 0; |
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int startIndex = familyIndex; |
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const FontFamily* startFamily = &font.fontDescription().family(); |
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for (int i = 0; startFamily && i < startIndex; i++) |
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startFamily = startFamily->next(); |
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const FontFamily* currFamily = startFamily; |
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while (currFamily && !result) { |
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familyIndex++; |
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if (currFamily->family().length()) |
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result = getCachedFontPlatformData(font.fontDescription(), currFamily->family()); |
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currFamily = currFamily->next(); |
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} |
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if (!currFamily) |
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familyIndex = cAllFamiliesScanned; |
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if (!result) |
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// We didn't find a font. Try to find a similar font using our own specific knowledge about our platform. |
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// For example on OS X, we know to map any families containing the words Arabic, Pashto, or Urdu to the |
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// Geeza Pro font. |
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result = getSimilarFontPlatformData(font); |
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if (!result && startIndex == 0) |
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// We still don't have a result. Hand back our last resort fallback font. We only do the last resort fallback |
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// when trying to find the primary font. Otherwise our fallback will rely on the actual characters used. |
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result = getLastResortFallbackFont(font); |
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// Now that we have a result, we need to go from FontPlatformData -> FontData. |
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return getCachedFontData(result); |
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} |
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} // namespace WebCore |