1/*
2 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
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#ifndef SVGTextLayoutEngineBaseline_h
21#define SVGTextLayoutEngineBaseline_h
22
23#if ENABLE(SVG)
24#include "SVGRenderStyleDefs.h"
25#include <wtf/Noncopyable.h>
26
27namespace WebCore {
28
29class Font;
30class RenderObject;
31class SVGElement;
32class SVGRenderStyle;
33class SVGTextMetrics;
34
35// Helper class used by SVGTextLayoutEngine to handle 'alignment-baseline' / 'dominant-baseline' and 'baseline-shift'.
36class SVGTextLayoutEngineBaseline {
37    WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngineBaseline);
38public:
39    SVGTextLayoutEngineBaseline(const Font&);
40
41    float calculateBaselineShift(const SVGRenderStyle*, SVGElement* lengthContext) const;
42    float calculateAlignmentBaselineShift(bool isVerticalText, const RenderObject* textRenderer) const;
43    float calculateGlyphOrientationAngle(bool isVerticalText, const SVGRenderStyle*, const UChar& character) const;
44    float calculateGlyphAdvanceAndOrientation(bool isVerticalText, SVGTextMetrics&, float angle, float& xOrientationShift, float& yOrientationShift) const;
45
46private:
47    EAlignmentBaseline dominantBaselineToAlignmentBaseline(bool isVerticalText, const RenderObject* textRenderer) const;
48
49    const Font& m_font;
50};
51
52} // namespace WebCore
53
54#endif // ENABLE(SVG)
55#endif
56