FULL PRODUCT VERSION :
Java HotSpot(TM) 64-Bit Server VM 1.7.0_19

ADDITIONAL OS VERSION INFORMATION :
RedHat Enterprise Linux 6.4

A DESCRIPTION OF THE PROBLEM :
The getAscent() and the getDescent() in java.awt.FontMetrics Class of OpenJDK1.7 returns incorrect TrueType font metrics.

Here is the comparison table.

**********************************
Oracle Corporation
OpenJDK 65-Bit Server VM
1.7.0_19
**********************************
font namefont stylefont sizeascentdescent

IPAMinchoBOLD9.191
IPAMinchoBOLD10.3102
IPAMinchoBOLD11.4112
IPAMinchoBOLD12.5122
IPAMinchoBOLD13.6132
IPAMinchoBOLD13.7132
IPAMinchoBOLD14.7142
IPAMinchoBOLD14.8142
IPAMinchoBOLD15.8152
IPAMinchoBOLD15.9152
IPAMinchoBOLD17162
IPAMinchoBOLD17.1162
IPAMinchoBOLD18.1172
IPAMinchoBOLD18.2172



**********************************
Sun Microsystems Inc.
Java HotSpot(TM) 64-Bit Server VM
1.6.0_38
**********************************
font namefont stylefont sizeascentdescent
IPAMinchoBOLD9.182
IPAMinchoBOLD10.392
IPAMinchoBOLD11.4102
IPAMinchoBOLD12.5112
IPAMinchoBOLD13.6122
IPAMinchoBOLD13.7122
IPAMinchoBOLD14.7132
IPAMinchoBOLD14.8132
IPAMinchoBOLD15.8142
IPAMinchoBOLD15.9142
IPAMinchoBOLD17152
IPAMinchoBOLD17.1153
IPAMinchoBOLD18.1163
IPAMinchoBOLD18.2163



**********************************
Oracle Corporation
Java HotSpot(TM) 64-Bit Server VM
1.7.0_17
**********************************
font namefont stylefont sizeascentdescent
IPAMinchoBOLD9.182
IPAMinchoBOLD10.392
IPAMinchoBOLD11.4102
IPAMinchoBOLD12.5112
IPAMinchoBOLD13.6122
IPAMinchoBOLD13.7122
IPAMinchoBOLD14.7132
IPAMinchoBOLD14.8132
IPAMinchoBOLD15.8142
IPAMinchoBOLD15.9142
IPAMinchoBOLD17152
IPAMinchoBOLD17.1153
IPAMinchoBOLD18.1163
IPAMinchoBOLD18.2163


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Attached test code in " Source code for an executable test case: " below.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
OpenJDK1.7 returns the same ascent and descent value with Returns of Oracle JDK1.6 and 1.7.
ACTUAL -
Returns of the getAscent() and the getDscent() are different between in OpenJDK1.7 and Sun JDK1.6/Oracle JDK 1.7.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

import java.awt.*;

public class FontMetricsTest {

private static String[] fontNames = { " IPAMincho " , " IPAGothic " };
private static int[] fontStyles = { Font.PLAIN, Font.BOLD, Font.ITALIC };
private static String[] fontStyleNames = { " PLAIN " , " BOLD " , " ITALIC " };


/**
 * @param args
 */
public static void main(String[] args) {
System.out.println( " === FONT METRICS TEST === " );
System.out.println( " java vendor, " +System.getProperty( " java.vendor " ));
System.out.println( " java version, " +System.getProperty( " java.version " ));
System.out.println( " java vm name, " +System.getProperty( " java.vm.name " ));
System.out.println( " font name,font style,font size,ascent,descent " );
for (int n=0 ; n<fontNames.length ; n++) {
for (int s=0 ; s<fontStyles.length ; s++) {
Font baseFont = new Font(fontNames[n], fontStyles[s], 16);
if ((!baseFont.getFamily().equals(fontNames[n])) && (! baseFont.getFontName().equals(fontNames[n]))) {
System.out.println(fontNames[n]+ " ,not found " );
}
for (int i=5; i<=100 ; i++) {
for (int j=0 ; j<10 ; j++) {
float fontSize = (float)i + ((float)j)/10.0f;
Font dFont = baseFont.deriveFont(fontSize);
Component comp = new TestComp();
FontMetrics metrics = comp.getFontMetrics(dFont);
double ascent = metrics.getAscent();
double descent = metrics.getDescent();
System.out.println(fontNames[n]+ " , " +fontStyleNames[s]+ " , " +fontSize+ " , " +ascent+ " , " +descent);
}
}
}
}
}

private static class TestComp extends Component {

public TestComp(){
super();
}

}

}

---------- END SOURCE ----------