Add required font metrics functions to QRawFont

Reviewed-by: Eskil
(cherry picked from commit 2c8df8bfb679885c3cbd2ee02f5e4053fdd554c2)

src/gui/text/qrawfont.cpp

@@ -301,6 +301,58 @@ qreal QRawFont::descent() const
     return d->fontEngine->descent().toReal();
 }
 
+/*!
+   Returns the xHeight of this QRawFont in pixel units.
+
+   \sa QFontMetricsF::xHeight()
+*/
+qreal QRawFont::xHeight() const
+{
+    if (!isValid())
+        return 0.0;
+
+    return d->fontEngine->xHeight().toReal();
+}
+
+/*!
+   Returns the leading of this QRawFont in pixel units.
+
+   \sa QFontMetricsF::leading()
+*/
+qreal QRawFont::leading() const
+{
+    if (!isValid())
+        return 0.0;
+
+    return d->fontEngine->leading().toReal();
+}
+
+/*!
+   Returns the average character width of this QRawFont in pixel units.
+
+   \sa QFontMetricsF::averageCharWidth()
+*/
+qreal QRawFont::averageCharWidth() const
+{
+    if (!isValid())
+        return 0.0;
+
+    return d->fontEngine->averageCharWidth().toReal();
+}
+
+/*!
+   Returns the width of the widest character in the font.
+
+   \sa QFontMetricsF::maxWidth()
+*/
+qreal QRawFont::maxCharWidth() const
+{
+    if (!isValid())
+        return 0.0;
+
+    return d->fontEngine->maxCharWidth();
+}
+
 /*!
    Returns the pixel size set for this QRawFont. The pixel size affects how glyphs are
    rasterized, the size of glyphs returned by pathForGlyph(), and is used to convert

src/gui/text/qrawfont.h

@@ -103,6 +103,10 @@ public:
 
     qreal ascent() const;
     qreal descent() const;
+    qreal leading() const;
+    qreal xHeight() const;
+    qreal averageCharWidth() const;
+    qreal maxCharWidth() const;
 
     qreal unitsPerEm() const;