#include "support/docstring.h"
#include <QFontMetrics>
+#include <QHash>
// Starting with version 3.1.0, Qt/X11 does its own caching of
// character width, so it is not necessary to provide ours.
#if defined(Q_WS_MACX) || defined(Q_WS_WIN32)
#define USE_LYX_FONTCACHE
-#include <map>
#endif
namespace lyx {
virtual int maxAscent() const;
virtual int maxDescent() const;
- virtual int ascent(lyx::char_type c) const;
- int descent(lyx::char_type c) const;
- virtual int lbearing(lyx::char_type c) const;
- virtual int rbearing(lyx::char_type c) const;
- virtual int width(lyx::char_type const * s, size_t n) const;
- virtual int signedWidth(lyx::docstring const & s) const;
- virtual void rectText(lyx::docstring const & str,
+#ifndef USE_LYX_FONTCACHE
+ virtual int width(char_type c) const {
+ return metrics_.width(QChar(static_cast<short int>(c)));
+ }
+#else
+ virtual int width(char_type c) const;
+#endif
+ virtual int ascent(char_type c) const;
+ virtual int descent(char_type c) const;
+ virtual int lbearing(char_type c) const;
+ virtual int rbearing(char_type c) const;
+ virtual int width(char_type const * s, size_t n) const;
+ virtual int signedWidth(docstring const & s) const;
+ virtual void rectText(docstring const & str,
int & width,
int & ascent,
int & descent) const;
- virtual void buttonText(lyx::docstring const & str,
+ virtual void buttonText(docstring const & str,
int & width,
int & ascent,
int & descent) const;
+ ///
+ int width(QString const & str) const;
private:
int smallcapsWidth(QString const & s) const;
bool smallcaps_shape_;
-#ifndef USE_LYX_FONTCACHE
- /// Return pixel width for the given unicode char
- int width(unsigned short val) const { return metrics_.width(QChar(val)); }
+#ifdef USE_LYX_FONTCACHE
-#else
- /// Return pixel width for the given unicode char
- int width(unsigned short val) const;
-
- typedef std::map<unsigned short, int> WidthCache;
/// Cache of char widths
- mutable WidthCache widthcache;
+ /** This cache adds 20Mo of memory to the LyX executable when
+ * loading UserGuide.lyx which contains a good number of fonts. If
+ * this turns out to be too much, we can switch to a \c QHash based
+ * solution.
+ **/
+ mutable QHash<char_type, int> width_cache_;
+
+ struct AscendDescend {
+ short int ascent;
+ short int descent;
+ };
+ mutable QHash<char_type, AscendDescend> metrics_cache_;
+ /// fill in \c metrics_cache_ at specified value.
+ void fillMetricsCache(char_type) const;
+
#endif // USE_LYX_FONTCACHE
};