1/*
2 * Copyright (C) 2011 Leo Yang <leoyang@webkit.org>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20#include "config.h"
21
22#if ENABLE(SVG_FONTS)
23#include "SVGAltGlyphItemElement.h"
24
25#include "ElementIterator.h"
26#include "SVGGlyphRefElement.h"
27#include "SVGNames.h"
28#include <wtf/IsoMallocInlines.h>
29
30namespace WebCore {
31
32WTF_MAKE_ISO_ALLOCATED_IMPL(SVGAltGlyphItemElement);
33
34inline SVGAltGlyphItemElement::SVGAltGlyphItemElement(const QualifiedName& tagName, Document& document)
35 : SVGElement(tagName, document)
36{
37 ASSERT(hasTagName(SVGNames::altGlyphItemTag));
38}
39
40Ref<SVGAltGlyphItemElement> SVGAltGlyphItemElement::create(const QualifiedName& tagName, Document& document)
41{
42 return adoptRef(*new SVGAltGlyphItemElement(tagName, document));
43}
44
45bool SVGAltGlyphItemElement::hasValidGlyphElements(Vector<String>& glyphNames) const
46{
47 // Spec: http://www.w3.org/TR/SVG/text.html#AltGlyphItemElement
48 // The ‘altGlyphItem’ element defines a candidate set of possible glyph substitutions.
49 // The first ‘altGlyphItem’ element whose referenced glyphs are all available is chosen.
50 // Its glyphs are rendered instead of the character(s) that are inside of the referencing
51 // ‘altGlyph’ element.
52 //
53 // Here we fill glyphNames and return true only if all referenced glyphs are valid and
54 // there is at least one glyph.
55
56 for (auto& glyphRef : childrenOfType<SVGGlyphRefElement>(*this)) {
57 String referredGlyphName;
58 if (glyphRef.hasValidGlyphElement(referredGlyphName))
59 glyphNames.append(referredGlyphName);
60 else {
61 glyphNames.clear();
62 return false;
63 }
64 }
65 return !glyphNames.isEmpty();
66}
67
68}
69
70#endif
71