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  1. JDK
  2. JDK-5012688

Antialiased lines do not match on the different platforms

    Details

    • Type: Bug
    • Status: Open
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: 5.0
    • Fix Version/s: None
    • Component/s: client-libs
    • Labels:
      None
    • Subcomponent:
      2d
    • CPU:
      generic
    • OS:
      solaris

      Description



      Name: auR10023 Date: 03/12/2004




      Two segments (one is a subsegment of the other) should set up the same points
      with the same values at their overlapping parts.

      But this works only on windows platform. On solaris and linux in some
      cases we have a lot of different points.

      Note, this happens only when antialiasing is turned on otherwise we have
      the same result on all platforms.

      Following test illustrates the problem.

      It draws segments described above in separate BufferedImages then
      compares them in (10,10,990,990) area. The difference (if any) is shown
      by putting images together with XOR enabled.


      -----------------------------Test.java------------------------------------

      import java.util.*;
      import java.awt.*;
      import java.awt.geom.*;
      import java.awt.image.*;

      public class Test {
          public static final int SIZE = 1000;
          public static BufferedImage bi3;
          public static void main(String[] args) {
              BufferedImage bi1 = new BufferedImage(SIZE, SIZE,
                                                    BufferedImage.TYPE_INT_RGB);
              BufferedImage bi2 = new BufferedImage(SIZE, SIZE,
                                                    BufferedImage.TYPE_INT_RGB);
              bi3 = new BufferedImage(SIZE, SIZE, BufferedImage.TYPE_INT_RGB);

              Graphics2D g1 = bi1.createGraphics();
              Graphics2D g2 = bi2.createGraphics();
              g1.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                                  RenderingHints.VALUE_ANTIALIAS_ON);
              g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                                  RenderingHints.VALUE_ANTIALIAS_ON);

              g1.setColor(Color.white);
              g1.fillRect(0, 0, SIZE, SIZE);

              g2.setColor(Color.white);
              g2.fillRect(0, 0, SIZE, SIZE);

              int x1 = 200;
              int y1 = 400;
              int dx = 1000;
              int dy = 800;

              g1.setColor(Color.black);
              g1.drawLine(x1, y1, x1 + dx, y1 + dy);

              g2.setColor(Color.black);
              g2.drawLine(x1, y1, x1 + 500*dx, y1 + 500*dy);

              int counter = 0;
              for (int i = 10; i < SIZE - 10 ; i++) {
                  for (int j = 10; j < SIZE -10 ; j++) {
                      if ( bi1.getRGB(i,j) != bi2.getRGB(i,j)) {
                          counter++;
                      }
                  }
              }

              Graphics2D gr = bi3.createGraphics();
              gr.setXORMode(Color.white);
              gr.drawImage(bi1, 0, 0, null);
              gr.drawImage(bi2, 0, 0, null);

              if (counter > 0) {
                  Frame frame = new Frame() {
                      public void paint(Graphics g) {
                          Graphics2D gr = (Graphics2D)g;
                          gr.drawImage(bi3, 10, 10, null);
                      }
                  };
                  frame.setSize(1010, 1010);
                  frame.setVisible(true);
              }

              System.out.println("Differs at " + counter + " points");
          }
      }

      --------------------------------------------------------------------------

      Solaris:

      #java -version
      java version "1.5.0-beta2"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b41)
      Java HotSpot(TM) Client VM (build 1.5.0-beta2-b41, mixed mode)

      java Test
      Differs at 279 points

      windows 2000:

      #java.exe -version

      java version "1.5.0-beta2"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b41)
      Java HotSpot(TM) Client VM (build 1.5.0-beta2-b41, mixed mode)

      #java.exe Test

      Differs at 0 points

      ======================================================================

        Activity

        Hide
        defectconv Defect Conversion BT2 (Inactive) added a comment -
        BT2:WORK AROUND



        Name: auR10023 Date: 03/12/2004


        ======================================================================
        Show
        defectconv Defect Conversion BT2 (Inactive) added a comment - BT2:WORK AROUND Name: auR10023 Date: 03/12/2004 ======================================================================

          People

          • Assignee:
            flar Jim Graham
            Reporter:
            avusunw Avu Avu (Inactive)
          • Votes:
            0 Vote for this issue
            Watchers:
            0 Start watching this issue

            Dates

            • Created:
              Updated:
              Imported:
              Indexed: