Remove some metrics parsing code from Core Text

The respective value in some of the default fonts like Lucida Grande
are simply not reliable. It seems that the only reliable way to get
such information is by going through all the glyphs.

It seems that these code are not well tested on Mac and should be
removed for now since it caused visible regressions in QLineEdit
rendering.

Reviewed-by: Eskil
(cherry picked from commit 8032d6f4ced50837e126f28c1475ad89eaf91ad7)

Change-Id: I85e71a2e3228a367659be9f5f6ec3e667e0ce902
Reviewed-on: http://codereview.qt.nokia.com/1264
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jiang Jiang <jiang.jiang@nokia.com>

2 files changed, 3 insertions, 20 deletions

diff --git a/src/gui/text/qfontengine_coretext.mm b/src/gui/text/qfontengine_coretext.mm
index a68a1551d9..303da8d363 100644
--- a/src/gui/text/qfontengine_coretext.mm
+++ b/src/gui/text/qfontengine_coretext.mm
@@ -492,17 +492,6 @@ void QCoreTextFontEngine::init()
         avgCharWidth = QFixed::fromReal(width * fontDef.pixelSize / emSize);
     } else
         avgCharWidth = QFontEngine::averageCharWidth();
-
-    ctMaxCharWidth = ctMinLeftBearing = ctMinRightBearing = 0;
-    QByteArray hheaTable = getSfntTable(MAKE_TAG('h', 'h', 'e', 'a'));
-    if (hheaTable.size() >= 16) {
-        quint16 width = qFromBigEndian<quint16>(reinterpret_cast<const uchar *>(hheaTable.constData() + 10));
-        ctMaxCharWidth = width * fontDef.pixelSize / emSize;
-        qint16 bearing = qFromBigEndian<qint16>(reinterpret_cast<const uchar *>(hheaTable.constData() + 12));
-        ctMinLeftBearing = bearing * fontDef.pixelSize / emSize;
-        bearing = qFromBigEndian<qint16>(reinterpret_cast<const uchar *>(hheaTable.constData() + 14));
-        ctMinRightBearing = bearing * fontDef.pixelSize / emSize;
-    }
 }
 
 bool QCoreTextFontEngine::stringToCMap(const QChar *str, int len, QGlyphLayout *glyphs,
@@ -599,20 +588,17 @@ QFixed QCoreTextFontEngine::averageCharWidth() const
 
 qreal QCoreTextFontEngine::maxCharWidth() const
 {
-    return (fontDef.styleStrategy & QFont::ForceIntegerMetrics)
-            ? qRound(ctMaxCharWidth) : ctMaxCharWidth;
+    return 0;
 }
 
 qreal QCoreTextFontEngine::minLeftBearing() const
 {
-    return (fontDef.styleStrategy & QFont::ForceIntegerMetrics)
-            ? qRound(ctMinLeftBearing) : ctMinLeftBearing;
+    return 0;
 }
 
 qreal QCoreTextFontEngine::minRightBearing() const
 {
-    return (fontDef.styleStrategy & QFont::ForceIntegerMetrics)
-            ? qRound(ctMinRightBearing) : ctMinLeftBearing;
+    return 0;
 }
 
 void QCoreTextFontEngine::draw(CGContextRef ctx, qreal x, qreal y, const QTextItemInt &ti, int paintDeviceHeight)
diff --git a/src/gui/text/qfontengine_coretext_p.h b/src/gui/text/qfontengine_coretext_p.h
index b531856a27..d8a3033be6 100644
--- a/src/gui/text/qfontengine_coretext_p.h
+++ b/src/gui/text/qfontengine_coretext_p.h
@@ -107,9 +107,6 @@ private:
     int synthesisFlags;
     CGAffineTransform transform;
     QFixed avgCharWidth;
-    qreal ctMaxCharWidth;
-    qreal ctMinLeftBearing;
-    qreal ctMinRightBearing;
     friend class QCoreTextFontEngineMulti;
 };