#i124823# fix the calculation of leading metrics for CoreText

vcl/aqua/source/gdi/ctfonts.cxx

@@ -176,10 +176,13 @@ void CTTextStyle::GetFontMetric( float fDPIY, ImplFontMetricData& rMetric ) cons
     CTFontRef aCTFontRef = (CTFontRef)CFDictionaryGetValue( mpStyleDict, kCTFontAttributeName );
 
     const double fPixelSize = (mfFontScale * fDPIY);
-    rMetric.mnAscent       = lrint( CTFontGetAscent( aCTFontRef ) * fPixelSize);
+    const CGFloat fAscent = CTFontGetAscent( aCTFontRef );
+    const CGFloat fCapHeight = CTFontGetCapHeight( aCTFontRef );
+    rMetric.mnAscent       = lrint( fAscent * fPixelSize);
     rMetric.mnDescent      = lrint( CTFontGetDescent( aCTFontRef ) * fPixelSize);
-    rMetric.mnIntLeading   = lrint( CTFontGetLeading( aCTFontRef ) * fPixelSize);
-    rMetric.mnExtLeading   = 0;
+    rMetric.mnExtLeading   = lrint( CTFontGetLeading( aCTFontRef ) * fPixelSize);
+    rMetric.mnIntLeading   = lrint( (fAscent - fCapHeight) * fPixelSize);
+
     // since ImplFontMetricData::mnWidth is only used for stretching/squeezing fonts
     // setting this width to the pixel height of the fontsize is good enough
     // it also makes the calculation of the stretch factor simple