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#pragma once
21
22#include "SVGRenderStyleDefs.h"
23#include <wtf/Noncopyable.h>
24
25namespace WebCore {
26
27class FontCascade;
28class RenderObject;
29class SVGElement;
30class SVGRenderStyle;
31class SVGTextMetrics;
32
33// Helper class used by SVGTextLayoutEngine to handle 'alignment-baseline' / 'dominant-baseline' and 'baseline-shift'.
34class SVGTextLayoutEngineBaseline {
35 WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngineBaseline);
36public:
37 SVGTextLayoutEngineBaseline(const FontCascade&);
38
39 float calculateBaselineShift(const SVGRenderStyle&, SVGElement* context) const;
40 float calculateAlignmentBaselineShift(bool isVerticalText, const RenderObject& textRenderer) const;
41 float calculateGlyphOrientationAngle(bool isVerticalText, const SVGRenderStyle&, const UChar& character) const;
42 float calculateGlyphAdvanceAndOrientation(bool isVerticalText, SVGTextMetrics&, float angle, float& xOrientationShift, float& yOrientationShift) const;
43
44private:
45 AlignmentBaseline dominantBaselineToAlignmentBaseline(bool isVerticalText, const RenderObject* textRenderer) const;
46
47 const FontCascade& m_font;
48};
49
50} // namespace WebCore
51