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      1 /*
      2  * Copyright (C) 2007 Eric Seidel <eric (at) webkit.org>
      3  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      4  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #include "config.h"
     23 
     24 #if ENABLE(SVG_FONTS)
     25 #include "SVGFontElement.h"
     26 
     27 #include "Document.h"
     28 #include "Font.h"
     29 #include "GlyphPageTreeNode.h"
     30 #include "SVGGlyphElement.h"
     31 #include "SVGHKernElement.h"
     32 #include "SVGMissingGlyphElement.h"
     33 #include "SVGNames.h"
     34 #include "SVGVKernElement.h"
     35 #include <wtf/ASCIICType.h>
     36 
     37 namespace WebCore {
     38 
     39 // Animated property declarations
     40 DEFINE_ANIMATED_BOOLEAN(SVGFontElement, SVGNames::externalResourcesRequiredAttr, ExternalResourcesRequired, externalResourcesRequired)
     41 
     42 inline SVGFontElement::SVGFontElement(const QualifiedName& tagName, Document* document)
     43     : SVGStyledElement(tagName, document)
     44     , m_isGlyphCacheValid(false)
     45 {
     46 }
     47 
     48 PassRefPtr<SVGFontElement> SVGFontElement::create(const QualifiedName& tagName, Document* document)
     49 {
     50     return adoptRef(new SVGFontElement(tagName, document));
     51 }
     52 
     53 void SVGFontElement::synchronizeProperty(const QualifiedName& attrName)
     54 {
     55     SVGStyledElement::synchronizeProperty(attrName);
     56 
     57     if (attrName == anyQName() || SVGExternalResourcesRequired::isKnownAttribute(attrName))
     58         synchronizeExternalResourcesRequired();
     59 }
     60 
     61 void SVGFontElement::invalidateGlyphCache()
     62 {
     63     if (m_isGlyphCacheValid) {
     64         m_glyphMap.clear();
     65         m_horizontalKerningPairs.clear();
     66         m_verticalKerningPairs.clear();
     67     }
     68     m_isGlyphCacheValid = false;
     69 }
     70 
     71 SVGMissingGlyphElement* SVGFontElement::firstMissingGlyphElement() const
     72 {
     73     for (Node* child = firstChild(); child; child = child->nextSibling()) {
     74         if (child->hasTagName(SVGNames::missing_glyphTag))
     75             return static_cast<SVGMissingGlyphElement*>(child);
     76     }
     77 
     78     return 0;
     79 }
     80 
     81 void SVGFontElement::ensureGlyphCache() const
     82 {
     83     if (m_isGlyphCacheValid)
     84         return;
     85 
     86     for (Node* child = firstChild(); child; child = child->nextSibling()) {
     87         if (child->hasTagName(SVGNames::glyphTag)) {
     88             SVGGlyphElement* glyph = static_cast<SVGGlyphElement*>(child);
     89             String unicode = glyph->getAttribute(SVGNames::unicodeAttr);
     90             if (unicode.length())
     91                 m_glyphMap.add(unicode, glyph->buildGlyphIdentifier());
     92         } else if (child->hasTagName(SVGNames::hkernTag)) {
     93             SVGHKernElement* hkern = static_cast<SVGHKernElement*>(child);
     94             hkern->buildHorizontalKerningPair(m_horizontalKerningPairs);
     95         } else if (child->hasTagName(SVGNames::vkernTag)) {
     96             SVGVKernElement* vkern = static_cast<SVGVKernElement*>(child);
     97             vkern->buildVerticalKerningPair(m_verticalKerningPairs);
     98         }
     99     }
    100 
    101     m_isGlyphCacheValid = true;
    102 }
    103 
    104 static bool stringMatchesUnicodeRange(const String& unicodeString, const UnicodeRanges& ranges, const HashSet<String>& unicodeValues)
    105 {
    106     if (unicodeString.isEmpty())
    107         return false;
    108 
    109     if (!ranges.isEmpty()) {
    110         UChar firstChar = unicodeString[0];
    111         const UnicodeRanges::const_iterator end = ranges.end();
    112         for (UnicodeRanges::const_iterator it = ranges.begin(); it != end; ++it) {
    113             if (firstChar >= it->first && firstChar <= it->second)
    114                 return true;
    115         }
    116     }
    117 
    118     if (!unicodeValues.isEmpty())
    119         return unicodeValues.contains(unicodeString);
    120 
    121     return false;
    122 }
    123 
    124 static bool stringMatchesGlyphName(const String& glyphName, const HashSet<String>& glyphValues)
    125 {
    126     if (glyphName.isEmpty())
    127         return false;
    128 
    129     if (!glyphValues.isEmpty())
    130         return glyphValues.contains(glyphName);
    131 
    132     return false;
    133 }
    134 
    135 static bool matches(const String& u1, const String& g1, const String& u2, const String& g2, const SVGKerningPair& kerningPair)
    136 {
    137     if (!stringMatchesUnicodeRange(u1, kerningPair.unicodeRange1, kerningPair.unicodeName1)
    138         && !stringMatchesGlyphName(g1, kerningPair.glyphName1))
    139         return false;
    140 
    141     if (!stringMatchesUnicodeRange(u2, kerningPair.unicodeRange2, kerningPair.unicodeName2)
    142         && !stringMatchesGlyphName(g2, kerningPair.glyphName2))
    143         return false;
    144 
    145     return true;
    146 }
    147 
    148 static float kerningForPairOfStringsAndGlyphs(KerningPairVector& kerningPairs, const String& u1, const String& g1, const String& u2, const String& g2)
    149 {
    150     KerningPairVector::const_iterator it = kerningPairs.end() - 1;
    151     const KerningPairVector::const_iterator begin = kerningPairs.begin() - 1;
    152     for (; it != begin; --it) {
    153         if (matches(u1, g1, u2, g2, *it))
    154             return it->kerning;
    155     }
    156 
    157     return 0.0f;
    158 }
    159 
    160 float SVGFontElement::horizontalKerningForPairOfStringsAndGlyphs(const String& u1, const String& g1, const String& u2, const String& g2) const
    161 {
    162     if (m_horizontalKerningPairs.isEmpty())
    163         return 0.0f;
    164 
    165     return kerningForPairOfStringsAndGlyphs(m_horizontalKerningPairs, u1, g1, u2, g2);
    166 }
    167 
    168 float SVGFontElement::verticalKerningForPairOfStringsAndGlyphs(const String& u1, const String& g1, const String& u2, const String& g2) const
    169 {
    170     if (m_verticalKerningPairs.isEmpty())
    171         return 0.0f;
    172 
    173     return kerningForPairOfStringsAndGlyphs(m_verticalKerningPairs, u1, g1, u2, g2);
    174 }
    175 
    176 void SVGFontElement::getGlyphIdentifiersForString(const String& string, Vector<SVGGlyphIdentifier>& glyphs) const
    177 {
    178     ensureGlyphCache();
    179     m_glyphMap.get(string, glyphs);
    180 }
    181 
    182 AttributeToPropertyTypeMap& SVGFontElement::attributeToPropertyTypeMap()
    183 {
    184     DEFINE_STATIC_LOCAL(AttributeToPropertyTypeMap, s_attributeToPropertyTypeMap, ());
    185     return s_attributeToPropertyTypeMap;
    186 }
    187 
    188 void SVGFontElement::fillAttributeToPropertyTypeMap()
    189 {
    190     SVGStyledElement::fillPassedAttributeToPropertyTypeMap(attributeToPropertyTypeMap());
    191 }
    192 
    193 }
    194 
    195 #endif // ENABLE(SVG_FONTS)
    196