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https://git.lyx.org/repos/lyx.git
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5f4e6d9a7c
- add constants instead of hard-coded values. - add assertions and comments for out of range values. git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@16126 a592a061-630c-0410-9148-cb99ea01b6c8
101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
// -*- C++ -*-
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/**
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* \file FontMetrics.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Abdelrazak Younes
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*
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* Full author contact details are available in file CREDITS.
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*/
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#ifndef QT4_FONT_METRICS_H
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#define QT4_FONT_METRICS_H
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#include "frontends/FontMetrics.h"
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#include "support/docstring.h"
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#include <QFontMetrics>
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// Starting with version 3.1.0, Qt/X11 does its own caching of
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// character width, so it is not necessary to provide ours.
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#if defined(Q_WS_MACX) || defined(Q_WS_WIN32)
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#define USE_LYX_FONTCACHE
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#endif
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namespace lyx {
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namespace frontend {
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size_t const MaxCharType = 65536;
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struct CharMetrics
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{
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int width;
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int ascent;
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int descent;
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};
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class GuiFontMetrics: public FontMetrics
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{
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public:
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GuiFontMetrics(QFont const & font);
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GuiFontMetrics(QFont const & font, QFont const & smallcaps_font);
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virtual ~GuiFontMetrics() {}
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virtual int maxAscent() const;
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virtual int maxDescent() const;
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#ifndef USE_LYX_FONTCACHE
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virtual int width(char_type c) const {
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return metrics_.width(QChar(static_cast<short int>(c)));
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}
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#else
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virtual int width(char_type c) const;
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#endif
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virtual int ascent(char_type c) const;
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virtual int descent(char_type c) const;
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virtual int lbearing(char_type c) const;
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virtual int rbearing(char_type c) const;
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virtual int width(char_type const * s, size_t n) const;
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virtual int signedWidth(docstring const & s) const;
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virtual void rectText(docstring const & str,
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int & width,
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int & ascent,
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int & descent) const;
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virtual void buttonText(docstring const & str,
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int & width,
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int & ascent,
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int & descent) const;
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///
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int width(QString const & str) const;
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private:
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int smallcapsWidth(QString const & s) const;
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/// Metrics on the font
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QFontMetrics metrics_;
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QFontMetrics smallcaps_metrics_;
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bool smallcaps_shape_;
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#ifdef USE_LYX_FONTCACHE
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/// fill in \c metrics_cache_ at specified value.
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void fillCache(unsigned short val) const;
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/// Cache of char widths
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/** This cache adds 20Mo of memory to the LyX executable when
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* loading UserGuide.lyx which contains a good number of fonts. If
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* this turns out to be too much, we can switch to a \c QHash based
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* solution.
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**/
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mutable CharMetrics metrics_cache_[MaxCharType];
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#endif // USE_LYX_FONTCACHE
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};
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} // namespace frontend
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} // namespace lyx
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#endif // QT4_FONT_METRICS_H
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