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      1 /*
      2  * Copyright (C) 2007 Eric Seidel <eric (at) webkit.org>
      3  * Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann (at) kde.org>
      4  * Copyright (C) 2008 Rob Buis <buis (at) kde.org>
      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 "core/svg/SVGGlyphElement.h"
     26 
     27 #include "core/svg/SVGFontData.h"
     28 #include "core/svg/SVGFontElement.h"
     29 #include "core/svg/SVGPathUtilities.h"
     30 
     31 namespace WebCore {
     32 
     33 inline SVGGlyphElement::SVGGlyphElement(Document& document)
     34     : SVGElement(SVGNames::glyphTag, document)
     35 {
     36     ScriptWrappable::init(this);
     37 }
     38 
     39 PassRefPtr<SVGGlyphElement> SVGGlyphElement::create(Document& document)
     40 {
     41     return adoptRef(new SVGGlyphElement(document));
     42 }
     43 
     44 void SVGGlyphElement::invalidateGlyphCache()
     45 {
     46     ContainerNode* fontNode = parentNode();
     47     if (fontNode && fontNode->hasTagName(SVGNames::fontTag))
     48         toSVGFontElement(fontNode)->invalidateGlyphCache();
     49 }
     50 
     51 void SVGGlyphElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
     52 {
     53     if (name == SVGNames::dAttr)
     54         invalidateGlyphCache();
     55     else
     56         SVGElement::parseAttribute(name, value);
     57 }
     58 
     59 Node::InsertionNotificationRequest SVGGlyphElement::insertedInto(ContainerNode* rootParent)
     60 {
     61     invalidateGlyphCache();
     62     return SVGElement::insertedInto(rootParent);
     63 }
     64 
     65 void SVGGlyphElement::removedFrom(ContainerNode* rootParent)
     66 {
     67     if (rootParent->inDocument())
     68         invalidateGlyphCache();
     69     SVGElement::removedFrom(rootParent);
     70 }
     71 
     72 static inline SVGGlyph::ArabicForm parseArabicForm(const AtomicString& value)
     73 {
     74     if (value == "medial")
     75         return SVGGlyph::Medial;
     76     if (value == "terminal")
     77         return SVGGlyph::Terminal;
     78     if (value == "isolated")
     79         return SVGGlyph::Isolated;
     80     if (value == "initial")
     81         return SVGGlyph::Initial;
     82 
     83     return SVGGlyph::None;
     84 }
     85 
     86 static inline SVGGlyph::Orientation parseOrientation(const AtomicString& value)
     87 {
     88     if (value == "h")
     89         return SVGGlyph::Horizontal;
     90     if (value == "v")
     91         return SVGGlyph::Vertical;
     92 
     93     return SVGGlyph::Both;
     94 }
     95 
     96 void SVGGlyphElement::inheritUnspecifiedAttributes(SVGGlyph& identifier, const SVGFontData* svgFontData)
     97 {
     98     if (identifier.horizontalAdvanceX == SVGGlyph::inheritedValue())
     99         identifier.horizontalAdvanceX = svgFontData->horizontalAdvanceX();
    100 
    101     if (identifier.verticalOriginX == SVGGlyph::inheritedValue())
    102         identifier.verticalOriginX = svgFontData->verticalOriginX();
    103 
    104     if (identifier.verticalOriginY == SVGGlyph::inheritedValue())
    105         identifier.verticalOriginY = svgFontData->verticalOriginY();
    106 
    107     if (identifier.verticalAdvanceY == SVGGlyph::inheritedValue())
    108         identifier.verticalAdvanceY = svgFontData->verticalAdvanceY();
    109 }
    110 
    111 static inline float parseSVGGlyphAttribute(const SVGElement* element, const WebCore::QualifiedName& name)
    112 {
    113     AtomicString value(element->fastGetAttribute(name));
    114     if (value.isEmpty())
    115         return SVGGlyph::inheritedValue();
    116 
    117     return value.toFloat();
    118 }
    119 
    120 SVGGlyph SVGGlyphElement::buildGenericGlyphIdentifier(const SVGElement* element)
    121 {
    122     SVGGlyph identifier;
    123     buildPathFromString(element->fastGetAttribute(SVGNames::dAttr), identifier.pathData);
    124 
    125     // Spec: The horizontal advance after rendering the glyph in horizontal orientation.
    126     // If the attribute is not specified, the effect is as if the attribute were set to the
    127     // value of the font's horiz-adv-x attribute. Glyph widths are required to be non-negative,
    128     // even if the glyph is typically rendered right-to-left, as in Hebrew and Arabic scripts.
    129     identifier.horizontalAdvanceX = parseSVGGlyphAttribute(element, SVGNames::horiz_adv_xAttr);
    130 
    131     // Spec: The X-coordinate in the font coordinate system of the origin of the glyph to be
    132     // used when drawing vertically oriented text. If the attribute is not specified, the effect
    133     // is as if the attribute were set to the value of the font's vert-origin-x attribute.
    134     identifier.verticalOriginX = parseSVGGlyphAttribute(element, SVGNames::vert_origin_xAttr);
    135 
    136     // Spec: The Y-coordinate in the font coordinate system of the origin of a glyph to be
    137     // used when drawing vertically oriented text. If the attribute is not specified, the effect
    138     // is as if the attribute were set to the value of the font's vert-origin-y attribute.
    139     identifier.verticalOriginY = parseSVGGlyphAttribute(element, SVGNames::vert_origin_yAttr);
    140 
    141     // Spec: The vertical advance after rendering a glyph in vertical orientation.
    142     // If the attribute is not specified, the effect is as if the attribute were set to the
    143     // value of the font's vert-adv-y attribute.
    144     identifier.verticalAdvanceY = parseSVGGlyphAttribute(element, SVGNames::vert_adv_yAttr);
    145 
    146     return identifier;
    147 }
    148 
    149 SVGGlyph SVGGlyphElement::buildGlyphIdentifier() const
    150 {
    151     SVGGlyph identifier(buildGenericGlyphIdentifier(this));
    152     identifier.glyphName = fastGetAttribute(SVGNames::glyph_nameAttr);
    153     identifier.orientation = parseOrientation(fastGetAttribute(SVGNames::orientationAttr));
    154     identifier.arabicForm = parseArabicForm(fastGetAttribute(SVGNames::arabic_formAttr));
    155 
    156     String language = fastGetAttribute(SVGNames::langAttr);
    157     if (!language.isEmpty())
    158         identifier.languages = parseDelimitedString(language, ',');
    159 
    160     return identifier;
    161 }
    162 
    163 }
    164 
    165 #endif // ENABLE(SVG_FONTS)
    166