* GuiFontMetrics: new metrics(QString) method

* QLPainter::paintText(): use GuiFontMetrics::metrics(QString) to avoid an ucs4 to QString conversion.



git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15584 a592a061-630c-0410-9148-cb99ea01b6c8

src/frontends/qt4/GuiFontMetrics.C

@@ -134,6 +134,24 @@ int GuiFontMetrics::width(char_type const * s, size_t ls) const
 }
 
 
+int GuiFontMetrics::width(QString const & ucs2) const
+{
+	int const ls = ucs2.size();
+	if (ls == 1 && !smallcaps_shape_) {
+		return width(ucs2[0].unicode());
+	}
+
+	if (smallcaps_shape_)
+		return smallcapsWidth(ucs2);
+
+	int w = 0;
+	for (int i = 0; i < ls; ++i)
+		w += width(ucs2[i].unicode());
+
+	return w;
+}
+
+
 int GuiFontMetrics::signedWidth(docstring const & s) const
 {
 	if (s[0] == '-')

src/frontends/qt4/GuiFontMetrics.h

@@ -53,6 +53,8 @@ public:
 		int & width,
 		int & ascent,
 		int & descent) const;
+	///
+	int width(QString const & str) const;
 
 private:
 	int smallcapsWidth(QString const & s) const;

src/frontends/qt4/QLPainter.C

@@ -14,6 +14,7 @@
 #include "QLPainter.h"
 
 #include "GuiApplication.h"
+#include "GuiFontMetrics.h"
 #include "GuiWorkArea.h"
 #include "QLImage.h"
 
@@ -24,7 +25,6 @@
 #include "language.h"
 #include "LColor.h"
 
-#include "frontends/FontMetrics.h"
 
 #include "support/unicode.h"
 
@@ -245,7 +245,7 @@ int QLPainter::text(int x, int y, char_type const * s, size_t ls,
 		// Here we use the font width cache instead of
 		//   textwidth = fontMetrics().width(str);
 		// because the above is awfully expensive on MacOSX
-		textwidth = guiApp->guiFontLoader().metrics(f).width(s, ls);
+		textwidth = fi.metrics->width(str);
 	} else {
 		textwidth = smallCapsText(x, y, str, f);
 	}