1/*
2 * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
3 * Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
4 * Copyright (C) 2008 Rob Buis <buis@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 "SVGNames.h"
28#include "core/svg/SVGFontData.h"
29#include "core/svg/SVGFontElement.h"
30#include "core/svg/SVGPathUtilities.h"
31
32namespace WebCore {
33
34inline SVGGlyphElement::SVGGlyphElement(const QualifiedName& tagName, Document* document)
35    : SVGElement(tagName, document)
36{
37    ASSERT(hasTagName(SVGNames::glyphTag));
38    ScriptWrappable::init(this);
39}
40
41PassRefPtr<SVGGlyphElement> SVGGlyphElement::create(const QualifiedName& tagName, Document* document)
42{
43    return adoptRef(new SVGGlyphElement(tagName, document));
44}
45
46void SVGGlyphElement::invalidateGlyphCache()
47{
48    ContainerNode* fontNode = parentNode();
49    if (fontNode && fontNode->hasTagName(SVGNames::fontTag))
50        toSVGFontElement(fontNode)->invalidateGlyphCache();
51}
52
53void SVGGlyphElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
54{
55    if (name == SVGNames::dAttr)
56        invalidateGlyphCache();
57    else
58        SVGElement::parseAttribute(name, value);
59}
60
61Node::InsertionNotificationRequest SVGGlyphElement::insertedInto(ContainerNode* rootParent)
62{
63    invalidateGlyphCache();
64    return SVGElement::insertedInto(rootParent);
65}
66
67void SVGGlyphElement::removedFrom(ContainerNode* rootParent)
68{
69    if (rootParent->inDocument())
70        invalidateGlyphCache();
71    SVGElement::removedFrom(rootParent);
72}
73
74static inline SVGGlyph::ArabicForm parseArabicForm(const AtomicString& value)
75{
76    if (value == "medial")
77        return SVGGlyph::Medial;
78    if (value == "terminal")
79        return SVGGlyph::Terminal;
80    if (value == "isolated")
81        return SVGGlyph::Isolated;
82    if (value == "initial")
83        return SVGGlyph::Initial;
84
85    return SVGGlyph::None;
86}
87
88static inline SVGGlyph::Orientation parseOrientation(const AtomicString& value)
89{
90    if (value == "h")
91        return SVGGlyph::Horizontal;
92    if (value == "v")
93        return SVGGlyph::Vertical;
94
95    return SVGGlyph::Both;
96}
97
98void SVGGlyphElement::inheritUnspecifiedAttributes(SVGGlyph& identifier, const SVGFontData* svgFontData)
99{
100    if (identifier.horizontalAdvanceX == SVGGlyph::inheritedValue())
101        identifier.horizontalAdvanceX = svgFontData->horizontalAdvanceX();
102
103    if (identifier.verticalOriginX == SVGGlyph::inheritedValue())
104        identifier.verticalOriginX = svgFontData->verticalOriginX();
105
106    if (identifier.verticalOriginY == SVGGlyph::inheritedValue())
107        identifier.verticalOriginY = svgFontData->verticalOriginY();
108
109    if (identifier.verticalAdvanceY == SVGGlyph::inheritedValue())
110        identifier.verticalAdvanceY = svgFontData->verticalAdvanceY();
111}
112
113static inline float parseSVGGlyphAttribute(const SVGElement* element, const WebCore::QualifiedName& name)
114{
115    AtomicString value(element->fastGetAttribute(name));
116    if (value.isEmpty())
117        return SVGGlyph::inheritedValue();
118
119    return value.toFloat();
120}
121
122SVGGlyph SVGGlyphElement::buildGenericGlyphIdentifier(const SVGElement* element)
123{
124    SVGGlyph identifier;
125    buildPathFromString(element->fastGetAttribute(SVGNames::dAttr), identifier.pathData);
126
127    // Spec: The horizontal advance after rendering the glyph in horizontal orientation.
128    // If the attribute is not specified, the effect is as if the attribute were set to the
129    // value of the font's horiz-adv-x attribute. Glyph widths are required to be non-negative,
130    // even if the glyph is typically rendered right-to-left, as in Hebrew and Arabic scripts.
131    identifier.horizontalAdvanceX = parseSVGGlyphAttribute(element, SVGNames::horiz_adv_xAttr);
132
133    // Spec: The X-coordinate in the font coordinate system of the origin of the glyph to be
134    // used when drawing vertically oriented text. If the attribute is not specified, the effect
135    // is as if the attribute were set to the value of the font's vert-origin-x attribute.
136    identifier.verticalOriginX = parseSVGGlyphAttribute(element, SVGNames::vert_origin_xAttr);
137
138    // Spec: The Y-coordinate in the font coordinate system of the origin of a glyph to be
139    // used when drawing vertically oriented text. If the attribute is not specified, the effect
140    // is as if the attribute were set to the value of the font's vert-origin-y attribute.
141    identifier.verticalOriginY = parseSVGGlyphAttribute(element, SVGNames::vert_origin_yAttr);
142
143    // Spec: The vertical advance after rendering a glyph in vertical orientation.
144    // If the attribute is not specified, the effect is as if the attribute were set to the
145    // value of the font's vert-adv-y attribute.
146    identifier.verticalAdvanceY = parseSVGGlyphAttribute(element, SVGNames::vert_adv_yAttr);
147
148    return identifier;
149}
150
151SVGGlyph SVGGlyphElement::buildGlyphIdentifier() const
152{
153    SVGGlyph identifier(buildGenericGlyphIdentifier(this));
154    identifier.glyphName = fastGetAttribute(SVGNames::glyph_nameAttr);
155    identifier.orientation = parseOrientation(fastGetAttribute(SVGNames::orientationAttr));
156    identifier.arabicForm = parseArabicForm(fastGetAttribute(SVGNames::arabic_formAttr));
157
158    String language = fastGetAttribute(SVGNames::langAttr);
159    if (!language.isEmpty())
160        identifier.languages = parseDelimitedString(language, ',');
161
162    return identifier;
163}
164
165}
166
167#endif // ENABLE(SVG_FONTS)
168