/****************************************************************************
**
** Copyright (C) 1992-2005 Trolltech AS. All rights reserved.
**
** This file is part of the text module of the Qt Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/

#include <assert.h>

#if (FREETYPE_MAJOR == 2) && (FREETYPE_MINOR == 1) && (FREETYPE_PATCH < 3)
#  define FT_KERNING_DEFAULT ft_kerning_default
#  define FT_KERNING_UNFITTED ft_kerning_unfitted
#endif


void QTextEngine::shapeText(int item) const
{
    assert(item < layoutData->items.size());
    QScriptItem &si = layoutData->items[item];

    if (si.num_glyphs)
        return;

    si.glyph_data_offset = layoutData->used;

    QFontEngine *font = fontEngine(si);

    si.ascent = font->ascent();
    si.descent = font->descent();

    QShaperItem shaper_item;
    shaper_item.script = si.analysis.script;
    shaper_item.string = &layoutData->string;
    shaper_item.from = si.position;
    shaper_item.length = length(item);
    shaper_item.font = font;
    shaper_item.num_glyphs = qMax(int(layoutData->num_glyphs - layoutData->used), shaper_item.length);
    shaper_item.flags = si.analysis.bidiLevel % 2 ? RightToLeft : 0;
    if (option.useDesignMetrics())
        shaper_item.flags |= DesignMetrics;

//     qDebug("shaping");
    while (1) {
//         qDebug("    . num_glyphs=%d, used=%d, item.num_glyphs=%d", num_glyphs, used, shaper_item.num_glyphs);
        ensureSpace(shaper_item.num_glyphs);
        shaper_item.num_glyphs = layoutData->num_glyphs - layoutData->used;
//          qDebug("    .. num_glyphs=%d, used=%d, item.num_glyphs=%d", num_glyphs, used, shaper_item.num_glyphs);
        shaper_item.glyphs = glyphs(&si);
        shaper_item.log_clusters = logClusters(&si);
        if (qt_scriptEngines[shaper_item.script].shape(&shaper_item))
            break;
    }

//     qDebug("    -> item: script=%d num_glyphs=%d", shaper_item.script, shaper_item.num_glyphs);
    si.num_glyphs = shaper_item.num_glyphs;

    layoutData->used += si.num_glyphs;

    QGlyphLayout *g = shaper_item.glyphs;
    if (this->font(si).d->kerning)
        font->doKerning(si.num_glyphs, g, option.useDesignMetrics() ? QFlag(QTextEngine::DesignMetrics) : QFlag(0));

    si.width = 0;
    QGlyphLayout *end = g + si.num_glyphs;
    while (g < end)
        si.width += (g++)->advance.x();

    return;
}

