Source: openjdk-8
Severity: normal
Tags: patch
Dear Maintainer,
Problem
=======
java.awt.Font#deriveFont(int style) tries to create new Font instance
that has the same font size. But it uses rounded font size wrongly.
So derived font has different font size.
(openjdk-7 has a same problem.)
Sample code
===========
import java.awt.Font;
public class DeriveFontProblem {
public static void main(String[] args) {
Font fontBase = new Font("Helvetica", Font.PLAIN, 1);
Font font105 = fontBase.deriveFont(10.5f);
System.out.println("font105 : size=" + font105.getSize2D());
Font font105Plain = font105.deriveFont(Font.PLAIN);
System.out.println("font105Plain: size=" + font105Plain.getSize2D());
}
}
Result of this code
===================
Actual
>font105 : size=10.5
>font105Plain: size=11.0
Expected
>font105 : size=10.5
>font105Plain: size=10.5
Suggested fix
=============
Font#deriveFont(int style) should use (float) "pointSize", not (int) "size".
Here is a patch to fix:
--- java/awt/Font.java.orig 2016-08-12 01:03:10.703646834 +0900
+++ java/awt/Font.java 2016-08-12 01:02:43.091646225 +0900
@@ -1933,7 +1933,7 @@
*/
public Font deriveFont(int style){
if (values == null) {
- return new Font(name, style, size, createdFont, font2DHandle);
+ return new Font(name, style, pointSize, createdFont, font2DHandle);
}
AttributeValues newValues = getAttributeValues().clone();
int oldStyle = (this.style != style) ? this.style : -1;
Reportbug output
================
-- System Information:
Debian Release: stretch/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'oldstable-updates'), (500,
'unstable'), (500, 'oldstable')
Architecture: amd64 (x86_64)
Kernel: Linux 3.14-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=ja_JP.UTF-8, LC_CTYPE=ja_JP.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: unable to detect
