Merge branch 'master' into biblatex2

[lyx.git] / src / frontends / qt4 / GuiFontMetrics.h

diff --git a/src/frontends/qt4/GuiFontMetrics.h b/src/frontends/qt4/GuiFontMetrics.h
index f3c87adc289d5c4e1336c9bb082fd5196062840b..de567ef8fb3742714ad96252405bafa663df2129 100644 (file)
--- 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.
  *
@@ -9,58 +9,65 @@
  * 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
-#endif
+// Declare which font metrics elements have to be cached
 
-namespace lyx {
-namespace frontend {
+#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
 
-size_t const MaxCharType = 65536;
+#if defined(CACHE_METRICS_WIDTH) || defined(CACHE_METRICS_BREAKAT) \
+  || defined(CACHE_METRICS_QTEXTLAYOUT)
+#define CACHE_SOME_METRICS
+#endif
 
-struct CharMetrics
-{
-       int width;
-       int ascent;
-       int descent;
-};
+#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;
-#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,
@@ -69,32 +76,61 @@ public:
                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_;
 
-#ifdef USE_LYX_FONTCACHE
+#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 ascends and descends
+       mutable QHash<char_type, AscendDescend> metrics_cache_;
        /// 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
+       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