1/*
2 * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.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#include "core/rendering/svg/RenderSVGTextPath.h"
23
24#include "core/rendering/svg/SVGPathData.h"
25#include "core/rendering/svg/SVGRenderSupport.h"
26#include "core/svg/SVGPathElement.h"
27#include "core/svg/SVGTextPathElement.h"
28
29namespace blink {
30
31RenderSVGTextPath::RenderSVGTextPath(Element* element)
32    : RenderSVGInline(element)
33{
34}
35
36bool RenderSVGTextPath::isChildAllowed(RenderObject* child, RenderStyle*) const
37{
38    if (child->isText())
39        return SVGRenderSupport::isRenderableTextNode(child);
40
41#if ENABLE(SVG_FONTS)
42    // 'altGlyph' is supported by the content model for 'textPath', but...
43    ASSERT(child->node());
44    if (isSVGAltGlyphElement(*child->node()))
45        return false;
46#endif
47
48    return child->isSVGInline() && !child->isSVGTextPath();
49}
50
51Path RenderSVGTextPath::layoutPath() const
52{
53    SVGTextPathElement* textPathElement = toSVGTextPathElement(node());
54    Element* targetElement = SVGURIReference::targetElementFromIRIString(textPathElement->href()->currentValue()->value(), textPathElement->treeScope());
55    if (!isSVGPathElement(targetElement))
56        return Path();
57
58    SVGPathElement& pathElement = toSVGPathElement(*targetElement);
59
60    Path pathData;
61    updatePathFromGraphicsElement(&pathElement, pathData);
62
63    // Spec:  The transform attribute on the referenced 'path' element represents a
64    // supplemental transformation relative to the current user coordinate system for
65    // the current 'text' element, including any adjustments to the current user coordinate
66    // system due to a possible transform attribute on the current 'text' element.
67    // http://www.w3.org/TR/SVG/text.html#TextPathElement
68    pathData.transform(pathElement.animatedLocalTransform());
69    return pathData;
70}
71
72float RenderSVGTextPath::startOffset() const
73{
74    return toSVGTextPathElement(node())->startOffset()->currentValue()->valueAsPercentage();
75}
76
77}
78