// -*- 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/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
-#include <map>
+// 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 {
-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;
- 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,
+ 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 lbearing(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;
- virtual void buttonText(lyx::docstring const & str,
+ virtual void buttonText(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(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_;
+ /// Cache of char widths
+ mutable QHash<char_type, int> width_cache_;
-#ifndef USE_LYX_FONTCACHE
- /// Return pixel width for the given unicode char
- int width(unsigned short val) const { return metrics_.width(QChar(val)); }
+#ifdef CACHE_METRICS_WIDTH
+ /// Cache of string widths
+ mutable QCache<docstring, int> strwidth_cache_;
+#endif
-#else
- /// Return pixel width for the given unicode char
- int width(unsigned short val) const;
+#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 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_;
- /// Cache of char widths
- mutable int widthcache_[65536];
-#endif // USE_LYX_FONTCACHE
};
} // namespace frontend
} // namespace lyx
-#endif // QT4_FONT_METRICS_H
+#endif // GUI_FONT_METRICS_H