// -*- C++ -*-
/**
- * \file FontMetrics.h
+ * \file GuiFontMetrics.h
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* Full author contact details are available in file CREDITS.
*/
-#ifndef QT4_FONT_METRICS_H
-#define QT4_FONT_METRICS_H
+#ifndef GUI_FONT_METRICS_H
+#define GUI_FONT_METRICS_H
#include "frontends/FontMetrics.h"
+#include "support/Cache.h"
#include "support/docstring.h"
+#include <QFont>
#include <QFontMetrics>
+#include <QHash>
+#include <QTextLayout>
-// 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
-#endif
+#include <memory>
namespace lyx {
namespace frontend {
-size_t const MaxCharType = 65536;
-
-struct CharMetrics
-{
- short int width;
- short int ascent;
- short int descent;
-};
-
-
-class GuiFontMetrics: public FontMetrics
+class GuiFontMetrics : public FontMetrics
{
public:
-
GuiFontMetrics(QFont const & font);
- GuiFontMetrics(QFont const & font, QFont const & smallcaps_font);
virtual ~GuiFontMetrics() {}
virtual int maxAscent() const;
virtual int maxDescent() const;
-#ifndef USE_LYX_FONTCACHE
- virtual int width(char_type c) const {
- return metrics_.width(QChar(static_cast<short int>(c)));
- }
-#else
+ 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;
-#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 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 & 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
+ std::shared_ptr<QTextLayout const>
+ getTextLayout(docstring const & s, bool const rtl,
+ double const wordspacing) const;
+
private:
- int smallcapsWidth(QString const & s) 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_;
-#ifdef USE_LYX_FONTCACHE
- /// fill in \c metrics_cache_ at specified value.
- void fillCache(unsigned short val) const;
/// Cache of char widths
- /** 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 CharMetrics metrics_cache_[MaxCharType];
-#endif // USE_LYX_FONTCACHE
+ mutable QHash<char_type, int> width_cache_;
+ /// Cache of string widths
+ mutable Cache<docstring, int> strwidth_cache_;
+ /// Cache for breakAt
+ mutable Cache<docstring, std::pair<int, int>> breakat_cache_;
+ /// Cache for QTextLayout
+ mutable Cache<docstring, std::shared_ptr<QTextLayout>> qtextlayout_cache_;
+
+ struct AscendDescend {
+ int ascent;
+ int descent;
+ };
+ /// Cache of char ascends and descends
+ mutable QHash<char_type, AscendDescend> metrics_cache_;
+ /// fill in \c metrics_cache_ at specified value.
+ AscendDescend const fillMetricsCache(char_type) const;
+
+ /// Cache of char right bearings
+ mutable QHash<char_type, int> rbearing_cache_;
+
};
} // namespace frontend
} // namespace lyx
-#endif // QT4_FONT_METRICS_H
+#endif // GUI_FONT_METRICS_H