#include "support/docstring.h"
-#include <map>
-
#include <QFont>
#include <QFontMetrics>
#include <QHash>
+#include <QTextLayout>
+
+// Declare which font metrics elements have to be cached
+
+#define CACHE_METRICS_WIDTH
+#define CACHE_METRICS_BREAKAT
+// Qt 5.x already has its own caching of QTextLayout objects
+#if (QT_VERSION < 0x050000)
+#define CACHE_METRICS_QTEXTLAYOUT
+#endif
+
+#if defined(CACHE_METRICS_WIDTH) || defined(CACHE_METRICS_BREAKAT) \
+ || defined(CACHE_METRICS_QTEXTLAYOUT)
+#define CACHE_SOME_METRICS
+#endif
+
+#ifdef CACHE_SOME_METRICS
+#include <QCache>
+#endif
namespace lyx {
namespace frontend {
int & width,
int & ascent,
int & descent) const;
+
+ int countExpanders(docstring const & str) const;
///
int width(QString const & str) const;
+ /// Return a pointer to a cached QTextLayout object
+ QTextLayout const *
+ getTextLayout(docstring const & s, bool const rtl,
+ double const wordspacing) const;
+
private:
+
+ std::pair<int, int> *
+ breakAt_helper(docstring const & s, int const x,
+ bool const rtl, bool const force) const;
+
/// The font
QFont font_;
/// Cache of char widths
mutable QHash<char_type, int> width_cache_;
+#ifdef CACHE_METRICS_WIDTH
/// Cache of string widths
- /// FIXME Try to use a QHash (this requires to define qHash(docstring))
- mutable std::map<docstring, int> strwidth_cache_;
+ mutable QCache<docstring, int> strwidth_cache_;
+#endif
+
+#ifdef CACHE_METRICS_BREAKAT
+ /// Cache for breakAt
+ mutable QCache<docstring, std::pair<int, int>> breakat_cache_;
+#endif
+
+#ifdef CACHE_METRICS_QTEXTLAYOUT
+ /// Cache for QTextLayout:s
+ mutable QCache<docstring, QTextLayout> qtextlayout_cache_;
+#endif
struct AscendDescend {
int ascent;
/// Cache of char right bearings
mutable QHash<char_type, int> rbearing_cache_;
+
};
} // namespace frontend