src/svg/qsvgfont.cpp
author Alex Gilkes <alex.gilkes@nokia.com>
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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the QtSvg module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file.  Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights.  These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qsvgfont_p.h"
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#ifndef QT_NO_SVG
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#include "qpainter.h"
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#include "qpen.h"
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#include "qdebug.h"
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#include "qpicture.h"
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QT_BEGIN_NAMESPACE
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QSvgGlyph::QSvgGlyph(QChar unicode, const QPainterPath &path, qreal horizAdvX)
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    : m_unicode(unicode), m_path(path), m_horizAdvX(horizAdvX)
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{
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}
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QSvgFont::QSvgFont(qreal horizAdvX)
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    : m_horizAdvX(horizAdvX)
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{
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}
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QString QSvgFont::familyName() const
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{
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    return m_familyName;
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}
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void QSvgFont::addGlyph(QChar unicode, const QPainterPath &path, qreal horizAdvX )
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{
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    m_glyphs.insert(unicode, QSvgGlyph(unicode, path,
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                                       (horizAdvX==-1)?m_horizAdvX:horizAdvX));
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}
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void QSvgFont::draw(QPainter *p, const QPointF &point, const QString &str, qreal pixelSize, Qt::Alignment alignment) const
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{
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    p->save();
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    p->translate(point);
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    p->scale(pixelSize / m_unitsPerEm, -pixelSize / m_unitsPerEm);
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    // Calculate the text width to be used for alignment
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    int textWidth = 0;
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    QString::const_iterator itr = str.constBegin();
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    for ( ; itr != str.constEnd(); ++itr) {
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        QChar unicode = *itr;
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        if (!m_glyphs.contains(*itr)) {
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            unicode = 0;
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            if (!m_glyphs.contains(unicode))
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                continue;
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        }
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        textWidth += static_cast<int>(m_glyphs[unicode].m_horizAdvX);
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    }
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    QPoint alignmentOffset(0, 0);
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    if (alignment == Qt::AlignHCenter) {
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        alignmentOffset.setX(-textWidth / 2);
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    } else if (alignment == Qt::AlignRight) {
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        alignmentOffset.setX(-textWidth);
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    }
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    p->translate(alignmentOffset);
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    // since in SVG the embedded font ain't really a path
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    // the outline has got to stay untransformed...
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    qreal penWidth = p->pen().widthF();
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    penWidth /= (pixelSize/m_unitsPerEm);
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    QPen pen = p->pen();
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    pen.setWidthF(penWidth);
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    p->setPen(pen);
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    itr = str.constBegin();
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    for ( ; itr != str.constEnd(); ++itr) {
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        QChar unicode = *itr;
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        if (!m_glyphs.contains(*itr)) {
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            unicode = 0;
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            if (!m_glyphs.contains(unicode))
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                continue;
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        }
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        p->drawPath(m_glyphs[unicode].m_path);
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        p->translate(m_glyphs[unicode].m_horizAdvX, 0);
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    }
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    p->restore();
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}
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void QSvgFont::setFamilyName(const QString &name)
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{
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    m_familyName = name;
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}
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void QSvgFont::setUnitsPerEm(qreal upem)
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{
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    m_unitsPerEm = upem;
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}
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QT_END_NAMESPACE
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#endif // QT_NO_SVG