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JDK-4723006 : Compositing in Java2D is slow in remote X case

Details
Type:
Bug
Submit Date:
2002-07-30
Status:
Closed
Updated Date:
2002-07-30
Project Name:
JDK
Resolved Date:
2002-07-30
Component:
client-libs
OS:
solaris_8
Sub-Component:
2d
CPU:
sparc
Priority:
P4
Resolution:
Duplicate
Affected Versions:
1.4.1
Fixed Versions:

Related Reports
Duplicate:

Sub Tasks

Description

Name: gm110360			Date: 07/30/2002


FULL PRODUCT VERSION :
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0_01-b03)
Java HotSpot(TM) Client VM (build 1.4.0_01-b03, mixed mode)


FULL OPERATING SYSTEM VERSION :
SunOS 5.8 Generic_108528-15 sun4u sparc SUNW,Netra-T4

ADDITIONAL OPERATING SYSTEMS :
Windows 2000
Redhat Linux


A DESCRIPTION OF THE PROBLEM :
It appears that using the Java2D graphics to draw filled
rectangles and lines is very slow, especially over remote
X sessions.

Here are the results of running the attached program:

1.) At the Console of the Sun
delta t for g fillRect = 1
delta t for drawing line = 0
delta t for g2d fill = 35
delta t for drawing g2d line = 9

After resizing:
delta t for g fillRect = 0
delta t for drawing line = 0
delta t for g2d fill = 19
delta t for drawing g2d line = 2

2.) At the Console of a 1.8 GHz PC running Windows 2000 and
Winaxe 6.2 to display the Java application running on the
Sun:

delta t for g fillRect = 1
delta t for drawing line = 0
delta t for g2d fill = 103
delta t for drawing line = 15

delta t for g fillRect = 0
delta t for drawing line = 0
delta t for g2d fill = 103
delta t for drawing line = 12


3.) At the Console of a 1.8 GHz
PC running Windows 2000:

delta t for g fillRect = 0
delta t for drawing line = 0
delta t for g2d fill = 93
delta t for drawing g2d line = 16

After resizing:
delta t for g fillRect = 0
delta t for drawing line = 0
delta t for g2d fill = 47
delta t for drawing g2d line = 0

Our actual code draws much larger rectangles and
thick lines resulting in delays of 400-1000 ms between
screen paints.

We've tried various work arounds such as:

setenv NO_J2D_DGA  1
setenv USE_DGA_PIXMAPS 1

but they had an adverse impact on the non-Java2D graphics
during remote X sessions.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1.Run the attached program
2.
3.

EXPECTED VERSUS ACTUAL BEHAVIOR :
Draws on the order of 1-10 ms or less.

REPRODUCIBILITY :
This bug can be reproduced always.

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


public class DrawingTest extends JPanel {

  public DrawingTest() {
    setBackground(Color.GRAY);
  }

  public void paintComponent(Graphics g) {
    super.paintComponent(g);
    
    long t0,t1;
    Rectangle rect2d = new Rectangle(50,50,200,200);
    int lineLength = 200;
    Graphics2D g2d;

    t0 = System.currentTimeMillis();
	g.setColor(Color.red);
    	g.fillRect(rect2d.x+200,rect2d.y+200,rect2d.width,rect2d.height);
    t1 = System.currentTimeMillis();
    System.out.println("delta t for g fillRect = " + (t1-t0));

    t0 = System.currentTimeMillis();
	g.setColor(Color.red);
	g.drawLine
(rect2d.x+200,rect2d.y+190,rect2d.x+200+lineLength,rect2d.y+190);
    t1 = System.currentTimeMillis();
    System.out.println("delta t for drawing line = " + (t1-t0));

    g2d = (Graphics2D)g;
    g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,.2f));
    g2d.setPaint(Color.green);

    t0 = System.currentTimeMillis();
	    g2d.fill(rect2d);
    t1 = System.currentTimeMillis();
    System.out.println("delta t for g2d fill = " + (t1-t0));

    t0 = System.currentTimeMillis();
	g.setColor(Color.green);
	g2d.drawLine(rect2d.x,rect2d.y-10,rect2d.x+lineLength,rect2d.y-10);
    t1 = System.currentTimeMillis();
    System.out.println("delta t for drawing g2d line = " + (t1-t0));

  }

  public static void main(String[] args) {
    JFrame frame = new JFrame("Drawing Test");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(new DrawingTest());
    frame.setSize(500,500);
    frame.show();

  }

}

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

CUSTOMER WORKAROUND :
Don't use Java2D graphics for applications requiring
display on a remote X server. (We mimicked the
transluscent rectangle with closely spaced hatching
using java.awt.Graphics only.)
(Review ID: 159981) 
======================================================================

                                    

Comments
WORK AROUND

the DGA-related workarounds won't have much effect for remote displaying.
Try -Dsun.java2d.pmoffscreen=false to disable remote offscreen acceleration.

This will speed up compositing/antialiasing, but will slow down the 
opaque backbuffer case.

###@###.### 2002-07-30
                                     
2002-07-30



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