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qfontmanager_qws.h

This is the verbatim text of the qfontmanager_qws.h include file. It is provided only for illustration; the copyright remains with Trolltech.


/****************************************************************************
** $Id: qt/qfontmanager_qws.h   3.3.8   edited Jan 11 14:38 $
**
** Definition of font rendering infrastructure for Embedded TQt
**
** Created : 940721
**
** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
**
** This file is part of the kernel module of the TQt GUI Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Alternatively you may (at your option) use any
** later version of the GNU General Public License if such license has
** been publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free TQt Foundation.
**
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** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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**********************************************************************/

#ifndef TQFONTMANAGER_QWS_H
#define TQFONTMANAGER_QWS_H

#ifndef QT_H
#include "qfont.h"
#include "qptrlist.h"
#include <private/qtextengine_p.h>
#endif // QT_H

// These are stored in the shared memory segment in front of their
// data, and indexed at the start of the segment

// This needs to be a multiple of 64 bits

class TQFontDef;

class Q_PACKED TQGlyphMetrics {

public:
    Q_UINT8 linestep;
    Q_UINT8 width;
    Q_UINT8 height;
    Q_UINT8 flags;

    Q_INT8 bearingx;      // Difference from pen position to glyph's left bbox
    Q_UINT8 advance;       // Difference between pen positions
    Q_INT8 bearingy;      // Used for putting characters on baseline

    Q_INT8 reserved;      // Do not use

    // Flags:
    // RendererOwnsData - the renderer is responsible for glyph data
    //                    memory deletion otherwise TQGlyphTree must
    //                    delete [] the data when the glyph is deleted.
    enum Flags { RendererOwnsData=0x01 };
};

class TQGlyph {
public:
    TQGlyph() { metrics=0; data=0; }
    TQGlyph(TQGlyphMetrics* m, uchar* d) :
	metrics(m), data(d) { }
    ~TQGlyph() {}

    TQGlyphMetrics* metrics;
    uchar* data;
};



class TQFontFactory;
class TQDiskFont;

// This is a particular font instance at a particular resolution
// e.g. Truetype Times, 10 point. There's only one of these though;
// we want to share generated glyphs

class TQRenderedFont {

public:

    // Normal font-type is monochrome; glyph data is a
    //   bitmap, which doesn't use much memory

    // Initialise for name A, renderer B, font type C, D glyphs

    TQRenderedFont(TQDiskFont *,const TQFontDef&);
    virtual ~TQRenderedFont();

    TQFontDef fontDef() const;

    int refcount;

    int ptsize;

    bool italic;
    unsigned int weight;

    void ref() { refcount++; }
    bool deref() { refcount--; return refcount==0; }

    bool match(const TQFontDef &);

    TQDiskFont* diskfont;
    int fascent,fdescent;
    int fleftbearing,frightbearing;
    int fmaxwidth;
    int fleading;
    int funderlinepos;
    int funderlinewidth;
    bool smooth;
    int maxchar;

    int ascent() { return fascent; }
    int descent() { return fdescent; }
    int width(int);
    int width( const TQString&, int =-1 );
    int leftBearing(int);
    int rightBearing(int);

    // Calling any of these can trigger a full-font metrics check
    // which can be expensive
    int minLeftBearing();
    int minRightBearing();
    int maxWidth();

    virtual bool inFont(glyph_t g) const=0;
    virtual TQGlyph render(glyph_t g)=0;

private:

};

// Keeps track of available renderers and which font is which

class TQDiskFontPrivate {};

class TQDiskFont {

public:
    TQDiskFont(TQFontFactory *f, const TQString& n, bool i, int w, int s,
	      const TQString &fl, const TQString& fi) :
	factory(f), name(n), italic(i), weight(w), size(s), flags(fl), file(fi)
    {
	loaded=FALSE;
	p=0;
    }

    TQRenderedFont* load(const TQFontDef &);

    TQFontDef fontDef() const;

    TQFontFactory *factory;
    TQString name;
    bool italic;
    int weight;
    int size;
    TQString flags;
    TQString file;
    bool loaded;

    TQDiskFontPrivate * p;
};

class TQCachePolicy {

public:

    virtual void cache(TQRenderedFont *)=0;
    virtual void uncache(TQRenderedFont *)=0;

};

// Exposed here so the default policy can be reset

class TQDefaultCachePolicy : public TQCachePolicy {

public:

    virtual void cache(TQRenderedFont *);
    virtual void uncache(TQRenderedFont *);

};

class TQFontManager {

public:

    TQPtrList<TQFontFactory> factories;
    TQPtrList<TQRenderedFont> cachedfonts;
    TQPtrList<TQDiskFont> diskfonts;

    TQFontManager();
    ~TQFontManager();

    // Font definition, type and color
    TQDiskFont * get(const TQFontDef &);

    static int cmpFontDef(const TQFontDef & goal, const TQFontDef & choice);

    static void initialize();
    static void cleanup();

    void setPolicy(TQCachePolicy *);

    void cache(TQRenderedFont * f) { policy->cache(f); }
    void uncache(TQRenderedFont * f) { policy->uncache(f); }
    TQRenderedFont * getCached(const TQFontDef &);

private:

    TQCachePolicy * policy;

};

class TQFontFactory {

public:

    TQFontFactory() {}
    virtual ~TQFontFactory() {}

    virtual TQRenderedFont * get(const TQFontDef &,TQDiskFont *)=0;
    virtual void load(TQDiskFont *) const=0;
    virtual void unload(TQDiskFont *) {}
    virtual TQString name()=0;
};

void qt_init_fonts();

extern TQFontManager * qt_fontmanager;

#endif


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TQt 3.3.8