source: trunk/src/gui/text/qfontengine_ft_p.h@ 561

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QFONTENGINE_FT_P_H
#define QFONTENGINE_FT_P_H
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "qfontengine_p.h"

#ifndef QT_NO_FREETYPE

#include <ft2build.h>
#include FT_FREETYPE_H

#if defined(Q_WS_X11)
#include <private/qt_x11_p.h>
#endif

#include <unistd.h>

#ifndef QT_NO_FONTCONFIG
#include <fontconfig/fontconfig.h>
#endif

#include <qmutex.h>

#include <harfbuzz-shaper.h>

QT_BEGIN_NAMESPACE

/*
 * This struct represents one font file on disk (like Arial.ttf) and is shared between all the font engines
 * that show this font file (at different pixel sizes).
 */
struct QFreetypeFace
{
    void computeSize(const QFontDef &fontDef, int *xsize, int *ysize, bool *outline_drawing);
    QFontEngine::Properties properties() const;
    bool getSfntTable(uint tag, uchar *buffer, uint *length) const;

    static QFreetypeFace *getFace(const QFontEngine::FaceId &face_id);
    void release(const QFontEngine::FaceId &face_id);

    // locks the struct for usage. Any read/write operations require locking.
    void lock()
    {
        _lock.lock();
    }
    void unlock()
    {
        _lock.unlock();
    }

    FT_Face face;
    HB_Face hbFace;
#ifndef QT_NO_FONTCONFIG
    FcCharSet *charset;
#endif
    int xsize; // 26.6
    int ysize; // 26.6
    FT_Matrix matrix;
    FT_CharMap unicode_map;
    FT_CharMap symbol_map;

    enum { cmapCacheSize = 0x200 };
    glyph_t cmapCache[cmapCacheSize];

    int fsType() const;

    HB_Error getPointInOutline(HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints);

    static void addGlyphToPath(FT_Face face, FT_GlyphSlot g, const QFixedPoint &point, QPainterPath *path, FT_Fixed x_scale, FT_Fixed y_scale);
    static void addBitmapToPath(FT_GlyphSlot slot, const QFixedPoint &point, QPainterPath *path, bool = false);

private:
    friend class QScopedPointerDeleter<QFreetypeFace>;
    QFreetypeFace() : _lock(QMutex::Recursive) {}
    ~QFreetypeFace() {}
    QAtomicInt ref;
    QMutex _lock;
    QByteArray fontData;
};

class Q_GUI_EXPORT QFontEngineFT : public QFontEngine
{
public:
    enum GlyphFormat {
        Format_None,
        Format_Render = Format_None,
        Format_Mono,
        Format_A8,
        Format_A32
    };

    /* we don't cache glyphs that are too large anyway, so we can make this struct rather small */
    struct Glyph {
        ~Glyph();
        short linearAdvance;
        unsigned char width;
        unsigned char height;
        signed char x;
        signed char y;
        signed char advance;
        signed char format;
        uchar *data;
        unsigned int uploadedToServer : 1;
    };

    enum SubpixelAntialiasingType {
        Subpixel_None,
        Subpixel_RGB,
        Subpixel_BGR,
        Subpixel_VRGB,
        Subpixel_VBGR
    };

#if defined(Q_WS_X11) && !defined(QT_NO_XRENDER)
    typedef XGlyphInfo GlyphInfo;
#else
    struct GlyphInfo {
        unsigned short  width;
        unsigned short  height;
        short           x;
        short           y;
        short           xOff;
        short           yOff;
    };
#endif

    struct QGlyphSet
    {
        QGlyphSet();
        ~QGlyphSet();
        FT_Matrix transformationMatrix;
        unsigned long id; // server sided id, GlyphSet for X11
        bool outline_drawing;
        mutable QHash<int, Glyph *> glyph_data; // maps from glyph index to glyph data
    };

    virtual QFontEngine::FaceId faceId() const;
    virtual QFontEngine::Properties properties() const;
    virtual QFixed emSquareSize() const;

    virtual bool getSfntTableData(uint tag, uchar *buffer, uint *length) const;
    virtual int synthesized() const;

    virtual QFixed ascent() const;
    virtual QFixed descent() const;
    virtual QFixed leading() const;
    virtual QFixed xHeight() const;
    virtual QFixed averageCharWidth() const;

    virtual qreal maxCharWidth() const;
    virtual qreal minLeftBearing() const;
    virtual qreal minRightBearing() const;
    virtual QFixed lineThickness() const;
    virtual QFixed underlinePosition() const;