Major buffered image render speed regression

Name: rmT116609 Date: 07/13/2004


FULL PRODUCT VERSION :
java version "1.5.0-beta3"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta3-b57)
Java HotSpot(TM) Client VM (build 1.5.0-beta3-b57, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

EXTRA RELEVANT SYSTEM CONFIGURATION :
Nvidia Geforce 2 GTS

A DESCRIPTION OF THE PROBLEM :
painting TYPE_3BYTE_BGR bufferedImages onto a JPanel extremely slow. Painfully slow compared with 1.4.2. and even 1.5 beta 1

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Simply paint any TYPE_3BYTE_BGR BufferedImage onto a JPanel adding a scale affine to the graphics in paintComponent. Attach a JSlider to the scale value in the affine.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Sliding the JSlider causes the image zoom in and out on the panel. Using 1.4.2 this is silky smooth.
ACTUAL -
The zoom change is extremely jerky and slow on 1.5 beta 3

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class ImageTest extends JFrame
{
    AffineTransform Trns;
    BufferedImage Img;

    JSlider VwZmSlider;
    JPanel PaintPanel;

    protected void setZoom(double newZoom)
    {
        Trns.setToScale(newZoom, newZoom);
    }

    public ImageTest()
    {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Trns = new AffineTransform();
        Img = new BufferedImage(500, 500, BufferedImage.TYPE_3BYTE_BGR);

        PaintPanel = new JPanel()
        {
            protected void paintComponent(Graphics g)
            {
                super.paintComponent(g);
                Graphics2D g2d = (Graphics2D)g;

                g2d.transform(Trns);
                g2d.drawImage(Img, 0, 0, this);
            }
        };

        Dimension Size = new Dimension(500, 500);
        PaintPanel.setPreferredSize(Size);
        PaintPanel.setMinimumSize(Size);
        PaintPanel.setMaximumSize(Size);

        VwZmSlider = new JSlider(0, 100, 50);
        VwZmSlider.addChangeListener(new ChangeListener()
        {
            public void stateChanged(ChangeEvent changeEvent)
            {
                int val = VwZmSlider.getValue();
                switch (val)
                {
                    case 0:
                        setZoom(0.1);
                        break;

                    case 15:
                        setZoom(0.5);
                        break;

                    case 30:
                        setZoom(0.75);
                        break;

                    case 50:
                        setZoom(1.0);
                        break;

                    case 70:
                        setZoom(1.5);
                        break;

                    case 85:
                        setZoom(2.0);
                        break;

                    case 100:
                        setZoom(3.0);
                        break;

                    default:
                        if (val > 0 && val < 15)
                        {
                            setZoom(((0.39 / 14.0) * (val - 1)) + 0.1);
                        }
                        else if (val > 15 && val < 30)
                        {
                            setZoom(((0.24 / 14.0) * (val - 15)) + 0.5);
                        }
                        else if (val > 30 && val < 50)
                        {
                            setZoom(((0.24 / 19.0) * (val - 30)) + 0.75);
                        }
                        else if (val > 50 && val < 70)
                        {
                            setZoom(((0.49 / 19.0) * (val - 50)) + 1.0);
                        }
                        else if (val > 70 && val < 85)
                        {
                            setZoom(((0.49 / 14.0) * (val - 70)) + 1.5);
                        }
                        else
                        {
                            setZoom(((0.99 / 14.0) * (val - 85)) + 2.0);
                        }
                        break;
                }
                PaintPanel.repaint();
            }
        });

        JPanel FillPanel = new JPanel();
        FillPanel.setLayout(new BorderLayout());

        FillPanel.add(PaintPanel, BorderLayout.CENTER);
        FillPanel.add(VwZmSlider, BorderLayout.SOUTH);

        getContentPane().add(FillPanel);
        pack();
        show();
    }

    public static void main(String[] args)
    {
        new ImageTest();
    }
}
---------- END SOURCE ----------
(Incident Review ID: 285594)
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