[OpenJDK 2D-Dev] The rotate method of OpenJDK is not working properly when using 180 degree rotation in DBCS plain style.

[Ayase177]

The rotate method of OpenJDK is not working properly when using 180 degree
rotation in DBCS plain style.

[Enviroment]
Win10Pro　Japanese
AdoptOpenJDK Java8 u252b09.1(x86)

[on condition]
Use Font:MS Gothic <-　Japanese Font so Double byte character set use.
Plain Style
font size under 21pt(21pt over is work well)

[Result]
Use Oracle Java8 / Plain style -> OK
Use Oracle Java8 / Bold style-> OK
Use AdoptOpenJDK AdoptOpenJDK Java8 u252b09.1 /  Plain style -> NG
Use AdoptOpenJDK AdoptOpenJDK Java8 u252b09.1 /  Bold style -> OK


[what I want to know]
Does AdoptOpenJDK AdoptOpenJDK Java8 u252b09.1 still have a rotating bug
with an unfixed Double byte character set?

[Similar bug report]
Graphics2D.drawString produces different text widths, but the same height,
when rotated 180 degrees
https://bugs.openjdk.java.net/browse/JDK-8194555

OpenJDK can't support render text with rotation for DBCS fonts
https://bugs.openjdk.java.net/browse/JDK-8163278

Fonts with embedded bitmaps are not always rotated
https://bugs.openjdk.java.net/browse/JDK-8204929


The test code is below.
!!test code use Japanese MS Gothic font and text.!!
=====================================================

package fonttest;

import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;

import javax.swing.JEditorPane;
import javax.swing.JFrame;

        class TestWindow extends JFrame{

                public TestWindow(String title, int width, int height) {
                        super(title);
                        setDefaultCloseOperation(EXIT_ON_CLOSE);
                        setSize(width,height);
                        setLocationRelativeTo(null);
                        setResizable(false);
                }
        }
        class DrawCanvas extends JEditorPane{
                public void paintComponent(Graphics g) {
                        super.paintComponent(g);

                        Font plain_FONT= new Font("ＭＳ ゴシック", Font.PLAIN, 15);
                        g.setFont(plain_FONT);
                        g.drawString("ABCabc0123456789あいうえお name=ＭＳ ゴシック（全角） 
plain 15pt", 10,
50);
                        System.out.println("1 " + g.getFont());

                        Font bold_FONT= new Font("ＭＳ ゴシック", Font.BOLD, 15);
                        g.setFont(bold_FONT);
                        g.drawString("ABCabc0123456789あいうえお  name=ＭＳ ゴシック（全角）  
Bold 15pt", 10,
100);
                        System.out.println("2 " + g.getFont());

                        //rotate
                        Graphics2D g2 = (Graphics2D)g;
                        g2.setFont(plain_FONT); // change Font object for Bold 
Style test.
                        FontMetrics fm = null;
                        String str = "ABCabc0123456789あいうえお";
                        fm = g2.getFontMetrics();
                        int asent = fm.getAscent();
                        g2.rotate(Math.toRadians(-180), 300, 200);
                        g2.drawString(str, 150+asent,10);
                }
        }

        public class FontTest {
                public static void main(String[] args) {
                        TestWindow tw = new TestWindow("フォントテスト", 800, 600);
                        tw.add(new DrawCanvas());
                        tw.setVisible(true);
                }
}
================================================================

Thank you.

<http://openjdk.5641.n7.nabble.com/file/t4349/AdoptOpenJDK252b09_Plain.png> 
<http://openjdk.5641.n7.nabble.com/file/t4349/AdoptOpenJDK252b09_Bold.png> 
<http://openjdk.5641.n7.nabble.com/file/t4349/Oracle.png> 
<http://openjdk.5641.n7.nabble.com/file/t4349/Oracle_Bold.png> 




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