#include "support/docstring.h"
+#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 {
{
public:
GuiFontMetrics(QFont const & font);
- GuiFontMetrics(QFont const & font, QFont const & smallcaps_font);
virtual ~GuiFontMetrics() {}
virtual int maxAscent() const;
virtual int maxDescent() const;
virtual Dimension const defaultDimension() const;
+ virtual int em() const;
+ virtual int lineWidth() const;
+ virtual int underlinePos() const;
+ virtual int strikeoutPos() const;
virtual int width(char_type c) const;
virtual int ascent(char_type c) const;
virtual int descent(char_type c) const;
virtual int rbearing(char_type c) const;
virtual int width(docstring const & s) const;
virtual int signedWidth(docstring const & s) const;
+ virtual int pos2x(docstring const & s, int pos, bool rtl, double ws) const;
+ virtual int x2pos(docstring const & s, int & x, bool rtl, double ws) const;
+ virtual bool breakAt(docstring & s, int & x, bool rtl, bool force) const;
virtual Dimension const dimension(char_type c) const;
virtual void rectText(docstring const & str,
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:
- int smallcapsWidth(char_type c) const;
+
+ std::pair<int, int> *
+ breakAt_helper(docstring const & s, int const x,
+ bool const rtl, bool const force) const;
+
+ /// The font
+ QFont font_;
/// Metrics on the font
QFontMetrics metrics_;
- QFontMetrics smallcaps_metrics_;
-
- bool smallcaps_shape_;
/// Cache of char widths
mutable QHash<char_type, int> width_cache_;
+#ifdef CACHE_METRICS_WIDTH
+ /// Cache of string widths
+ 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;
int descent;
/// Cache of char right bearings
mutable QHash<char_type, int> rbearing_cache_;
+
};
} // namespace frontend