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  1. JDK
  2. JDK-8074250

In RTL, Swing application performs much slower with Hebrew text

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Details

    • Bug
    • Status: Closed
    • P4
    • Resolution: Duplicate
    • 7u65
    • None
    • client-libs
    • x86_64
    • windows_7

    Description

      FULL PRODUCT VERSION :
      java version "1.7.0_51"
      Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
      Java HotSpot(TM) Client VM (build 24.51-b03, mixed mode)


      ADDITIONAL OS VERSION INFORMATION :
      Microsoft Windows [Version 6.1.7601]

      A DESCRIPTION OF THE PROBLEM :
      Performance of FontMetrics calculation is very slow if in the text at least one letter is Hebrew

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Run the attached sample code.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Performs much slower with Hebrew text.
      ACTUAL -
      Performance should be same as with English text.

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import java.awt.Font;
      import java.awt.FontMetrics;
      import java.awt.Graphics;
      import java.awt.image.BufferedImage;

      public class TestHebrewPerformance
      {

       public static void main( String args[] ) {
        String hebrew= "הָאָֽרֶץ׃ בְּרֵאשִׁ֖יאֱלֹהִ֑ת הַשָּׁמַ֖יִם וְאֵ֥ת הָאָֽ";
        //String hebrew= "abcde()agjkljkjelwkהָ";
        String english="abcde()agjklj;lkjelwk";
        FontMetrics fm=createFontMetrics(new Font("dialog",Font.PLAIN,12));
        int size=50000;
        long start=System.currentTimeMillis();
        for(int i=0;i<size;i++)
        {
         fm.stringWidth(hebrew);
        }
        System.out.println("Calculation time for hebrew: "+(System.currentTimeMillis()-start)+" ms");
        start=System.currentTimeMillis();
        for(int i=0;i<size;i++)
        {
         fm.stringWidth(english);
        }
        System.out.println("Calculation time for english: "+(System.currentTimeMillis()-start)+" ms");
       }
       private static FontMetrics createFontMetrics(Font font)
       {
        BufferedImage bi = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB_PRE);
        Graphics g = bi.getGraphics();
        FontMetrics fm = g.getFontMetrics(font);
        g.dispose();
        bi = null;
        return fm;
       }
      }

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

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            webbuggrp Webbug Group
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            Dates

              Created:
              Updated:
              Resolved: