FULL PRODUCT VERSION :
java version "1.6.0_18"
Java(TM) SE Runtime Environment (build 1.6.0_18-b07)
Java HotSpot(TM) Client VM (build 16.0-b13, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.0.6002]

A DESCRIPTION OF THE PROBLEM :
When using a concave clipping region and a custom composite object, Graphics.drawImage method throws an exception. The problem doesn't occur when AlphaComposite is used.

The cause looks to be inside sun.java2d.loops.Blit.java, line 157. The source raster is re-assigned with the newly created child raster. When consecutive spans are on the same line (same y coordinate,) the second span will throw an exception as the requested child raster coordinates are outside of the previously created raster area.





ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "AWT-EventQueue-0" java.awt.image.RasterFormatException: (x + width) is outside raster
        at sun.awt.image.IntegerInterleavedRaster.createWritableChild(IntegerInterleavedRaster.java:450)
        at sun.awt.image.IntegerInterleavedRaster.createChild(IntegerInterleavedRaster.java:499)
        at sun.java2d.loops.Blit$AnyBlit.Blit(Blit.java:157)
        at sun.java2d.pipe.DrawImage.blitSurfaceData(DrawImage.java:927)
        at sun.java2d.pipe.DrawImage.renderImageCopy(DrawImage.java:550)
        at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:73)
        at sun.java2d.pipe.DrawImage.copyImage(DrawImage.java:998)
        at sun.java2d.pipe.ValidatePipe.copyImage(ValidatePipe.java:178)
        at sun.java2d.SunGraphics2D.copyImage(SunGraphics2D.java:2909)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2940)
        at sun.java2d.SunGraphics2D.drawImage(SunGraphics2D.java:2895)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
    public void paintComponent(Graphics g) {

        super.paintComponent(g);

        Graphics2D g2d = (Graphics2D)g;

        Composite composite = new Composite() {
            
            public CompositeContext createContext(ColorModel srcColorModel,
                                                  ColorModel dstColorModel,
                                                  RenderingHints hints) {
                
                return new CompositeContext() {
                    public void compose(Raster src, Raster dstIn, WritableRaster dstOut) {}
                    public void dispose() {}
                };
            }
        };

        Path2D.Double clip = new Path2D.Double();

        clip.moveTo(0, 0);
        clip.lineTo(200, 100);
        clip.lineTo(400, 0);
        clip.lineTo(200, 400);

        g2d.setClip(clip);
        g2d.setComposite(composite);

        BufferedImage image = new BufferedImage(400, 400, BufferedImage.TYPE_INT_ARGB);
        
        g2d.drawImage(image, 0, 0, 400, 400, null);
    }

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