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  1. JDK
  2. JDK-4740695

Graphics rendering of rectangles to offscreen images slower than in 1.3

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    • Subcomponent:
      2d
    • CPU:
      x86
    • OS:
      windows_2000

      Description

      Name: pa48320 Date: 09/03/2002

      bug 4527745 was marked closed/fixed in 1.4.1. However, with the latest build (19) we are seeing slow downs with drawing vertical lines, empty rectangles, and filled rectangles of about 3 times. The original bug mentioned clipping as an issue in the test. Our test should not have any clipping. Tests were made Onscreen vs Offscreen and the onscreen performance was way slower in 1.4.1. The following routines were used to test the problem:
      public java.awt.Image image = null;
      public boolean paintFlag = false;
      public void paint(java.awt.Graphics g)
      {


      super.paint(g);
      if (image == null)
      image = createImage( 300, 250 );
      if (!paintFlag)
      return;
      System.out.println("Graphics timing test on screen-"+System.getProperty("java.vm.version"));

      drawImage(g);
      System.out.println("Graphics timing test off screen-"+System.getProperty("java.vm.version"));
      System.out.println(image.getClass().getName());
      drawImage(image.getGraphics());

            // Blit the image.
            g.drawImage( image, 300, 0, this );
      paintFlag = false;
      }

      public void drawImage(java.awt.Graphics ig)
      {
            // Clear the image and draw the title.
            int maxShape = 3;
            int maxSize = 10;
            int maxIter = 200000;
            ig.clearRect( 0, 0, getWidth() / 2, getHeight());
      int ymin = getInsets().top;
      int xmin = getInsets().left;
            ig.drawString( "Time in milliseconds, " + maxIter + " markers:", xmin+2, ymin+12 );
            System.out.println( "Time in milliseconds, " + maxIter + " markers:" );
            int y0 = 0;
            // Draw all shapes.
            for( int shape = 0; ( shape < maxShape ); shape++ )
            {
      if( shape == 0 )
               System.out.println("Vertical bars");
              else if( shape == 1 )
               System.out.println("Empty rectangles");
              else
               System.out.println("Filled rectangles");
               // Calculate the center.
               int x0 = 60 * ( shape % 10 ) + 10+xmin;
               y0 = ymin+25 + 250 * ( shape / 10 );
               
               // Draw all sizes.
               for( int size = 1; ( size <= maxSize ); size++ )
               {
                  // Draw all iterations.
                  int size2 = size / 2;
                  long time0 = ( long )System.currentTimeMillis();
                  for( int j = 0; ( j < maxIter ); j++ )
                  { if( shape == 0 )
                        ig.drawLine( x0, y0 - size2, x0, y0 - size2 + size );
                     else if( shape == 1 )
                        ig.drawRect( x0 - size2, y0 - size2, size, size );
                     else
                        ig.fillRect( x0 - size2, y0 - size2, size, size );
                  }
                  
                  // Draw the time.
                  long time1 = ( long )System.currentTimeMillis();
                  long time = ( time1 - time0 );
                  String secs = "";
                  for( int j = 10; ( j < 10000 ); j *= 10 )
                  { if( time < j )
                        secs += " ";
                  }
                  secs += time;
                  ig.drawString( secs, x0 + 7, y0 + 5 );
      System.out.println(secs);
                  y0 += 20;
               }
            }
      }
      This test produced the following timings:
      Graphics timing test on screen-1.4.1-rc-b19
      Time in milliseconds, 200000 markers:
      Vertical bars
        750
        485
        500
        500
        485
        485
        500
        484
        500
        485
      Empty rectangles
        515
      1766
      1703
      1719
      1750
      1781
      1734
      1719
      1703
      1765
      Filled rectangles
        500
        500
        485
        500
        484
        500
        485
        500
        484
        516
      Graphics timing test off screen-1.4.1-rc-b19
      Time in milliseconds, 200000 markers:
      Vertical bars
        234
        234
        282
        250
        235
        250
        250
        281
        250
        250
      Empty rectangles
        250
        250
        250
        250
        265
        282
        265
        266
        281
        281
      Filled rectangles
        219
        219
        250
        234
        235
        234
        250
        266
        250
        250
      Graphics timing test on screen-1.3.1_03-b03
      Time in milliseconds, 200000 markers:
      Vertical bars
      2453
      2313
      2015
      1938
      1937
      1985
      1953
      1984
      1938
      1938
      Empty rectangles
      3219
      3203
      3234
      3219
      3203
      3187
      3188
      3219
      3218
      3204
      Filled rectangles
      1968
      1969
      1969
      1969
      1968
      1969
      1969
      1953
      1953
      1953
      Graphics timing test off screen-1.3.1_03-b03
      Time in milliseconds, 200000 markers:
      Vertical bars
        156
        188
        171
        172
        172
        188
        187
        203
        188
        203
      Empty rectangles
        156
        156
        188
        172
        156
        188
        171
        188
        203
        188
      Filled rectangles
        156
        156
        172
        187
        188
        187
        188
        203
        219
        250

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

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            Reporter:
            pallenba Peter Allenbach (Inactive)
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