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/*
* Copyright (C) 2007, 2008, 2011 Apple Inc. All rights reserved.
* Copyright (C) 2013 Google Inc. All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 COMPUTER, INC. OR
* 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.
*/
#include "config.h"
#include "CSSSegmentedFontFaceCache.h"
#include "FontFamilyNames.h"
#include "core/css/CSSFontFace.h"
#include "core/css/CSSFontFaceSource.h"
#include "core/css/CSSFontSelector.h"
#include "core/css/CSSSegmentedFontFace.h"
#include "core/css/CSSValueList.h"
#include "core/css/StyleRule.h"
#include "core/fetch/FontResource.h"
#include "core/fetch/ResourceFetcher.h"
#include "platform/fonts/FontDescription.h"
#include "wtf/text/AtomicString.h"
namespace WebCore {
CSSSegmentedFontFaceCache::CSSSegmentedFontFaceCache()
: m_version(0)
{
}
void CSSSegmentedFontFaceCache::add(CSSFontSelector* cssFontSelector, const StyleRuleFontFace* fontFaceRule, PassRefPtr<CSSFontFace> prpCssFontFace)
{
RefPtr<CSSFontFace> cssFontFace = prpCssFontFace;
if (!m_styleRuleToFontFace.add(fontFaceRule, cssFontFace).isNewEntry)
return;
FontFace* fontFace = cssFontFace->fontFace();
OwnPtr<TraitsMap>& familyFontFaces = m_fontFaces.add(fontFace->family(), nullptr).iterator->value;
if (!familyFontFaces)
familyFontFaces = adoptPtr(new TraitsMap);
RefPtr<CSSSegmentedFontFace>& segmentedFontFace = familyFontFaces->add(fontFace->traitsMask(), 0).iterator->value;
if (!segmentedFontFace)
segmentedFontFace = CSSSegmentedFontFace::create(cssFontSelector, static_cast<FontTraitsMask>(fontFace->traitsMask()));
segmentedFontFace->appendFontFace(cssFontFace);
++m_version;
}
void CSSSegmentedFontFaceCache::remove(const StyleRuleFontFace* fontFaceRule)
{
StyleRuleToFontFace::iterator styleRuleToFontFaceIter = m_styleRuleToFontFace.find(fontFaceRule);
if (styleRuleToFontFaceIter == m_styleRuleToFontFace.end())
return;
RefPtr<CSSFontFace> cssFontFace = styleRuleToFontFaceIter->value;
FamilyToTraitsMap::iterator fontFacesIter = m_fontFaces.find(cssFontFace->fontFace()->family());
if (fontFacesIter == m_fontFaces.end())
return;
TraitsMap* familyFontFaces = fontFacesIter->value.get();
TraitsMap::iterator familyFontFacesIter = familyFontFaces->find(cssFontFace->fontFace()->traitsMask());
if (familyFontFacesIter == familyFontFaces->end())
return;
RefPtr<CSSSegmentedFontFace> segmentedFontFace = familyFontFacesIter->value;
segmentedFontFace->removeFontFace(cssFontFace);
if (segmentedFontFace->isEmpty()) {
familyFontFaces->remove(familyFontFacesIter);
if (familyFontFaces->isEmpty())
m_fontFaces.remove(fontFacesIter);
}
m_styleRuleToFontFace.remove(styleRuleToFontFaceIter);
m_fonts.clear();
++m_version;
}
static inline bool compareFontFaces(CSSSegmentedFontFace* first, CSSSegmentedFontFace* second, FontTraitsMask desiredTraitsMask)
{
FontTraitsMask firstTraitsMask = first->traitsMask();
FontTraitsMask secondTraitsMask = second->traitsMask();
bool firstHasDesiredVariant = firstTraitsMask & desiredTraitsMask & FontVariantMask;
bool secondHasDesiredVariant = secondTraitsMask & desiredTraitsMask & FontVariantMask;
if (firstHasDesiredVariant != secondHasDesiredVariant)
return firstHasDesiredVariant;
// We need to check font-variant css property for CSS2.1 compatibility.
if (desiredTraitsMask & FontVariantSmallCapsMask) {
// Prefer a font that has indicated that it can only support small-caps to a font that claims to support
// all variants. The specialized font is more likely to be true small-caps and not require synthesis.
bool firstRequiresSmallCaps = (firstTraitsMask & FontVariantSmallCapsMask) && !(firstTraitsMask & FontVariantNormalMask);
bool secondRequiresSmallCaps = (secondTraitsMask & FontVariantSmallCapsMask) && !(secondTraitsMask & FontVariantNormalMask);
if (firstRequiresSmallCaps != secondRequiresSmallCaps)
return firstRequiresSmallCaps;
}
bool firstHasDesiredStyle = firstTraitsMask & desiredTraitsMask & FontStyleMask;
bool secondHasDesiredStyle = secondTraitsMask & desiredTraitsMask & FontStyleMask;
if (firstHasDesiredStyle != secondHasDesiredStyle)
return firstHasDesiredStyle;
if (desiredTraitsMask & FontStyleItalicMask) {
// Prefer a font that has indicated that it can only support italics to a font that claims to support
// all styles. The specialized font is more likely to be the one the author wants used.
bool firstRequiresItalics = (firstTraitsMask & FontStyleItalicMask) && !(firstTraitsMask & FontStyleNormalMask);
bool secondRequiresItalics = (secondTraitsMask & FontStyleItalicMask) && !(secondTraitsMask & FontStyleNormalMask);
if (firstRequiresItalics != secondRequiresItalics)
return firstRequiresItalics;
}
if (secondTraitsMask & desiredTraitsMask & FontWeightMask)
return false;
if (firstTraitsMask & desiredTraitsMask & FontWeightMask)
return true;
// http://www.w3.org/TR/2011/WD-css3-fonts-20111004/#font-matching-algorithm says :
// - If the desired weight is less than 400, weights below the desired weight are checked in descending order followed by weights above the desired weight in ascending order until a match is found.
// - If the desired weight is greater than 500, weights above the desired weight are checked in ascending order followed by weights below the desired weight in descending order until a match is found.
// - If the desired weight is 400, 500 is checked first and then the rule for desired weights less than 400 is used.
// - If the desired weight is 500, 400 is checked first and then the rule for desired weights less than 400 is used.
static const unsigned fallbackRuleSets = 9;
static const unsigned rulesPerSet = 8;
static const FontTraitsMask weightFallbackRuleSets[fallbackRuleSets][rulesPerSet] = {
{ FontWeight200Mask, FontWeight300Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
{ FontWeight100Mask, FontWeight300Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
{ FontWeight200Mask, FontWeight100Mask, FontWeight400Mask, FontWeight500Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
{ FontWeight500Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
{ FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask, FontWeight600Mask, FontWeight700Mask, FontWeight800Mask, FontWeight900Mask },
{ FontWeight700Mask, FontWeight800Mask, FontWeight900Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
{ FontWeight800Mask, FontWeight900Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
{ FontWeight900Mask, FontWeight700Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask },
{ FontWeight800Mask, FontWeight700Mask, FontWeight600Mask, FontWeight500Mask, FontWeight400Mask, FontWeight300Mask, FontWeight200Mask, FontWeight100Mask }
};
unsigned ruleSetIndex = 0;
unsigned w = FontWeight100Bit;
while (!(desiredTraitsMask & (1 << w))) {
w++;
ruleSetIndex++;
}
ASSERT(ruleSetIndex < fallbackRuleSets);
const FontTraitsMask* weightFallbackRule = weightFallbackRuleSets[ruleSetIndex];
for (unsigned i = 0; i < rulesPerSet; ++i) {
if (secondTraitsMask & weightFallbackRule[i])
return false;
if (firstTraitsMask & weightFallbackRule[i])
return true;
}
return false;
}
CSSSegmentedFontFace* CSSSegmentedFontFaceCache::get(const FontDescription& fontDescription, const AtomicString& family)
{
TraitsMap* familyFontFaces = m_fontFaces.get(family);
if (!familyFontFaces || familyFontFaces->isEmpty())
return 0;
OwnPtr<TraitsMap>& segmentedFontFaceCache = m_fonts.add(family, nullptr).iterator->value;
if (!segmentedFontFaceCache)
segmentedFontFaceCache = adoptPtr(new TraitsMap);
FontTraitsMask traitsMask = fontDescription.traitsMask();
RefPtr<CSSSegmentedFontFace>& face = segmentedFontFaceCache->add(traitsMask, 0).iterator->value;
if (!face) {
for (TraitsMap::const_iterator i = familyFontFaces->begin(); i != familyFontFaces->end(); ++i) {
CSSSegmentedFontFace* candidate = i->value.get();
unsigned candidateTraitsMask = candidate->traitsMask();
if ((traitsMask & FontStyleNormalMask) && !(candidateTraitsMask & FontStyleNormalMask))
continue;
if ((traitsMask & FontVariantNormalMask) && !(candidateTraitsMask & FontVariantNormalMask))
continue;
if (!face || compareFontFaces(candidate, face.get(), traitsMask))
face = candidate;
}
}
return face.get();
}
}
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