lyx_mirror/src/frontends/qt4/qfont_loader.h

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// -*- C++ -*-
/**
* \file qfont_loader.h
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author John Levon
*
* Full author contact details are available in file CREDITS.
*/
#ifndef QFONTLOADER_H
#define QFONTLOADER_H
#include "encoding.h"
#include "lyxfont.h"
#include <QFont>
#include <QFontMetrics>
#if QT_VERSION < 0x030100
#define USE_LYX_FONTCACHE
#endif
#if defined(USE_LYX_FONTCACHE)
#include <map>
#endif
/**
* Qt font loader for LyX. Matches LyXFonts against
* actual QFont instances, and also caches metrics.
*/
class QLFontInfo {
public:
QLFontInfo(LyXFont const & f);
/// Return pixel width for the given unicode char
int width(Uchar val) const;
/// The font instance
QFont font;
/// Metrics on the font
QFontMetrics metrics;
#if defined(USE_LYX_FONTCACHE)
typedef std::map<Uchar, int> WidthCache;
/// Cache of char widths
WidthCache widthcache;
#endif
};
/// Hold info about a particular font
class FontLoader {
public:
///
FontLoader();
/// Update fonts after zoom, dpi, font names, or norm change
void update();
/// Do we have anything matching?
bool available(LyXFont const & f);
/// Get the QFont for this LyXFont
QFont const & get(LyXFont const & f) {
return fontinfo(f).font;
}
/// Get the QFont metrics for this LyXFont
QFontMetrics const & metrics(LyXFont const & f) {
return fontinfo(f).metrics;
}
/// Called before QApplication is initialized
static void initFontPath();
/// Called the first time when available() can't load a symbol font
static void addToFontPath();
/// Get font info (font + metrics) for the given LyX font.
QLFontInfo & fontinfo(LyXFont const & f) {
QLFontInfo * & fi =
fontinfo_[f.family()][f.series()][f.realShape()][f.size()];
if (!fi)
fi = new QLFontInfo(f);
return *fi;
}
private:
/// BUTT ugly !
QLFontInfo * fontinfo_[LyXFont::NUM_FAMILIES][2][4][10];
};
extern FontLoader fontloader;
#endif // QFONT_LOADER_H