X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2Ffrontends%2Fqt4%2FGuiFontMetrics.h;h=3f50dfe5d29902d0516e2b27c3ca2ec32fa4d4e4;hb=28be7d552f62cc02fa86d7f79201d089bfb2d7b5;hp=44ee9c38205a06fc89c837f80a89ce44b6c90047;hpb=00edcc582ff7cfe9cbbc8f7458ea29649bd642d9;p=lyx.git

diff --git a/src/frontends/qt4/GuiFontMetrics.h b/src/frontends/qt4/GuiFontMetrics.h
index 44ee9c3820..3f50dfe5d2 100644
--- a/src/frontends/qt4/GuiFontMetrics.h
+++ b/src/frontends/qt4/GuiFontMetrics.h
@@ -1,6 +1,6 @@
 // -*- 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.
  *
@@ -9,75 +9,104 @@
  * 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
-#include <map>
-#endif
+#include <memory>
 
 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,
+		const int offset,
 		int & width,
 		int & ascent,
 		int & descent) const;
 
-private:
-	int smallcapsWidth(QString const & s) const;
+	int countExpanders(docstring const & str) const;
+	///
+	int width(QString const & str) const;
 
-	/// Metrics on the font
-	QFontMetrics metrics_;
-	QFontMetrics smallcaps_metrics_;
+	/// Return a pointer to a cached QTextLayout object
+	std::shared_ptr<QTextLayout const>
+	getTextLayout(docstring const & s, bool const rtl,
+	              double const wordspacing) const;
 
-	bool smallcaps_shape_;
+private:
 
-#ifndef USE_LYX_FONTCACHE
-	/// Return pixel width for the given unicode char
-	int width(unsigned short val) const { return metrics_.width(QChar(val)); }
+	std::pair<int, int> breakAt_helper(docstring const & s, int const x,
+	                                   bool const rtl, bool const force) const;
 
-#else
-	/// Return pixel width for the given unicode char
-	int width(unsigned short val) const;
+	/// The font
+	QFont font_;
+
+	/// Metrics on the font
+	QFontMetrics metrics_;
 
-	typedef std::map<unsigned short, int> WidthCache;
 	/// Cache of char widths
-	mutable WidthCache widthcache;
-#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