SVGTextMetrics.h   [plain text]

/*
 * Copyright (C) Research In Motion Limited 2010-2012. 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.
 */

#pragma once

#include <wtf/text/WTFString.h>

namespace WebCore {

class RenderSVGInlineText;
class SVGTextLayoutAttributes;
class TextRun;

class SVGTextMetrics {
public:
    enum MetricsType { SkippedSpaceMetrics };

    SVGTextMetrics();
    explicit SVGTextMetrics(MetricsType);
    SVGTextMetrics(RenderSVGInlineText&, unsigned length, float width);

    static SVGTextMetrics measureCharacterRange(RenderSVGInlineText&, unsigned position, unsigned length);
    static TextRun constructTextRun(RenderSVGInlineText&, unsigned position = 0, unsigned length = std::numeric_limits<unsigned>::max());

    bool isEmpty() const { return !m_width && !m_height && !m_glyph.isValid && m_length == 1; }

    float width() const { return m_width; }
    void setWidth(float width) { m_width = width; }

    float height() const { return m_height; }
    unsigned length() const { return m_length; }

    struct Glyph {
        Glyph()
            : isValid(false)
        {
        }

        bool operator==(const Glyph& other)
        {
            return isValid == other.isValid
                && name == other.name
                && unicodeString == other.unicodeString;
        }

        bool isValid;
        String name;
        String unicodeString;
    };

    // Only useful when measuring individual characters, to lookup ligatures.
    const Glyph& glyph() const { return m_glyph; }

private:
    SVGTextMetrics(RenderSVGInlineText&, const TextRun&);

    float m_width;
    float m_height;
    unsigned m_length;
    Glyph m_glyph;
};

} // namespace WebCore