Added capHeight() to QRawFont and QFontMetrics(F)

Cap height is an important metric of font, in particular it is
required to make decent implementation of "initial-letter"
CSS property in QtWebKit.

Note that some fonts lack cap height metadata, so we need to
fall back to measuring H letter height.

Change-Id: Icf69d92159d070889085e20d31f2e397d796d940
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.h b/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.h
index f038dcfde4..fb2df00b7e 100644
--- a/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.h
+++ b/src/plugins/platforms/windows/qwindowsfontenginedirectwrite.h
@@ -87,6 +87,7 @@ public:
                                         const QTransform &matrix, GlyphFormat) Q_DECL_OVERRIDE;
 
     QFixed ascent() const Q_DECL_OVERRIDE;
+    QFixed capHeight() const Q_DECL_OVERRIDE;
     QFixed descent() const Q_DECL_OVERRIDE;
     QFixed leading() const Q_DECL_OVERRIDE;
     QFixed xHeight() const Q_DECL_OVERRIDE;
@@ -122,6 +123,7 @@ private:
     QFixed m_underlinePosition;
     int m_unitsPerEm;
     QFixed m_ascent;
+    QFixed m_capHeight;
     QFixed m_descent;
     QFixed m_xHeight;
     QFixed m_lineGap;