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  1. JDK
  2. JDK-8168759

Incorrect vertical positioning of diacritics

    Details

    • Subcomponent:
      2d
    • Resolved In Build:
      b150
    • CPU:
      x86
    • OS:
      other

      Description

      FULL PRODUCT VERSION :
      java version "9-ea"
      Java(TM) SE Runtime Environment (build 9-ea+140)
      Java HotSpot(TM) Server VM (build 9-ea+140, mixed mode)

      ADDITIONAL OS VERSION INFORMATION :
      Microsoft Windows [Version 10.0.14393]

      A DESCRIPTION OF THE PROBLEM :
      Positioning of diacritical marks for rendering of e.g. Arabic text is incorrect (shifted vertically with respect to correct position).
      This seems to be a regression introduced with the change in http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/a0c8eb083f39, flipping the sign of y glyph offset when processing data returned by Harfbuzz.

      REGRESSION. Last worked in version 9

      ADDITIONAL REGRESSION INFORMATION:
      java version "9-ea"
      Java(TM) SE Runtime Environment (build 9-ea+136)
      Java HotSpot(TM) Server VM (build 9-ea+136, mixed mode)

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Run a sample program with the source given below.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Diacritics in the rendered text are located at correct positions (as can be seen when running using 9-ea+136 or latest Java 8 build).
      ACTUAL -
      Some diacritics are rendered lower than expected.

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import javax.swing.*;
      import java.awt.*;

      public class JLabelTest {
          public static void main(String[] args) {
              SwingUtilities.invokeLater(() -> {
                  JFrame frame = new JFrame();
                  JLabel label = new JLabel("العَرَبِيَّة");
                  label.setFont(new Font("Courier New", Font.PLAIN, 36));
                  frame.add(label);
                  frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
                  frame.pack();
                  frame.setLocationRelativeTo(null);
                  frame.setVisible(true);
              });

          }
      }

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

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              • Assignee:
                prr Philip Race
                Reporter:
                webbuggrp Webbug Group
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                Dates

                • Created:
                  Updated:
                  Resolved: