Source/core/rendering/svg/SVGTextLayoutEngineBaseline.h

/*
 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifndef SVGTextLayoutEngineBaseline_h
#define SVGTextLayoutEngineBaseline_h

#include "core/rendering/style/SVGRenderStyleDefs.h"
#include "wtf/Noncopyable.h"

namespace WebCore {

class Font;
class RenderObject;
class SVGElement;
class SVGRenderStyle;
class SVGTextMetrics;

// Helper class used by SVGTextLayoutEngine to handle 'alignment-baseline' / 'dominant-baseline' and 'baseline-shift'.
class SVGTextLayoutEngineBaseline {
    WTF_MAKE_NONCOPYABLE(SVGTextLayoutEngineBaseline);
public:
    SVGTextLayoutEngineBaseline(const Font&);

    float calculateBaselineShift(const SVGRenderStyle*, SVGElement* lengthContext) const;
    float calculateAlignmentBaselineShift(bool isVerticalText, const RenderObject* textRenderer) const;
    float calculateGlyphOrientationAngle(bool isVerticalText, const SVGRenderStyle*, const UChar& character) const;
    float calculateGlyphAdvanceAndOrientation(bool isVerticalText, SVGTextMetrics&, float angle, float& xOrientationShift, float& yOrientationShift) const;

private:
    EAlignmentBaseline dominantBaselineToAlignmentBaseline(bool isVerticalText, const RenderObject* textRenderer) const;

    const Font& m_font;
};

} // namespace WebCore

#endif