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It is provided only for illustration; the copyright remains with Trolltech. +<hr> +<pre> +/**************************************************************************** +** $Id: qt/qfontmanager_qws.h 3.3.8 edited Jan 11 14:38 $ +** +** Definition of font rendering infrastructure for Embedded Qt +** +** Created : 940721 +** +** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. +** +** This file is part of the kernel module of the Qt 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 Qt Foundation. +** +** Please review the following information to ensure GNU General +** 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 +** review the following information: +** http://trolltech.com/products/qt/licenses/licensing/licensingoverview +** or contact the sales department at sales@trolltech.com. +** +** Licensees holding valid Qt Commercial licenses may use this file in +** accordance with the Qt Commercial License Agreement provided with +** the Software. +** +** This file is provided "AS IS" with NO WARRANTY OF ANY KIND, +** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted +** herein. +** +**********************************************************************/ + +#ifndef QFONTMANAGER_QWS_H +#define QFONTMANAGER_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 QFontDef; + +class Q_PACKED QGlyphMetrics { + +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 QGlyphTree must + // delete [] the data when the glyph is deleted. + enum Flags { RendererOwnsData=0x01 }; +}; + +class QGlyph { +public: + QGlyph() { metrics=0; data=0; } + QGlyph(QGlyphMetrics* m, uchar* d) : + metrics(m), data(d) { } + ~QGlyph() {} + + QGlyphMetrics* metrics; + uchar* data; +}; + + + +class QFontFactory; +class QDiskFont; + +// 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 QRenderedFont { + +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 + + QRenderedFont(QDiskFont *,const QFontDef&); + virtual ~QRenderedFont(); + + QFontDef fontDef() const; + + int refcount; + + int ptsize; + + bool italic; + unsigned int weight; + + void ref() { refcount++; } + bool deref() { refcount--; return refcount==0; } + + bool match(const QFontDef &); + + QDiskFont* 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 QString&, 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 QGlyph render(glyph_t g)=0; + +private: + +}; + +// Keeps track of available renderers and which font is which + +class QDiskFontPrivate {}; + +class QDiskFont { + +public: + QDiskFont(QFontFactory *f, const QString& n, bool i, int w, int s, + const QString &fl, const QString& fi) : + factory(f), name(n), italic(i), weight(w), size(s), flags(fl), file(fi) + { + loaded=FALSE; + p=0; + } + + QRenderedFont* load(const QFontDef &); + + QFontDef fontDef() const; + + QFontFactory *factory; + QString name; + bool italic; + int weight; + int size; + QString flags; + QString file; + bool loaded; + + QDiskFontPrivate * p; +}; + +class QCachePolicy { + +public: + + virtual void cache(QRenderedFont *)=0; + virtual void uncache(QRenderedFont *)=0; + +}; + +// Exposed here so the default policy can be reset + +class QDefaultCachePolicy : public QCachePolicy { + +public: + + virtual void cache(QRenderedFont *); + virtual void uncache(QRenderedFont *); + +}; + +class QFontManager { + +public: + + QPtrList<QFontFactory> factories; + QPtrList<QRenderedFont> cachedfonts; + QPtrList<QDiskFont> diskfonts; + + QFontManager(); + ~QFontManager(); + + // Font definition, type and color + QDiskFont * get(const QFontDef &); + + static int cmpFontDef(const QFontDef & goal, const QFontDef & choice); + + static void initialize(); + static void cleanup(); + + void setPolicy(QCachePolicy *); + + void cache(QRenderedFont * f) { policy->cache(f); } + void uncache(QRenderedFont * f) { policy->uncache(f); } + QRenderedFont * getCached(const QFontDef &); + +private: + + QCachePolicy * policy; + +}; + +class QFontFactory { + +public: + + QFontFactory() {} + virtual ~QFontFactory() {} + + virtual QRenderedFont * get(const QFontDef &,QDiskFont *)=0; + virtual void load(QDiskFont *) const=0; + virtual void unload(QDiskFont *) {} + virtual QString name()=0; +}; + +void qt_init_fonts(); + +extern QFontManager * qt_fontmanager; + +#endif +</pre> +<!-- eof --> +<p><address><hr><div align=center> +<table width=100% cellspacing=0 border=0><tr> +<td>Copyright © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |