[JAVA2D] Using custom DataBuffer

[Brian Peterson]

I'm trying to create a BufferedImage that'll read the image data from disk.
So I wrote a DataBuffer subclass that reads from a file. This data buffer is
TYPE_INT, but I get an exception saying that I need an integer data buffer:

java.awt.image.RasterFormatException: IntegerComponentRasters must
haveinteger DataBuffers
        at sun.awt.image.IntegerComponentRaster.<init>(Unknown Source)
        at sun.awt.image.IntegerInterleavedRaster.<init>(Unknown Source)
        at sun.awt.image.IntegerInterleavedRaster.<init>(Unknown Source)
        at java.awt.image.Raster.createPackedRaster(Unknown Source)
        at TestImage$MyPanel.<init>(TestImage.java:131)
        at TestImage$MyPanel.<init>(TestImage.java:105)
        at TestImage.<init>(TestImage.java:91)
        at TestImage.main(TestImage.java:33)

Any idea (1) why IntegerComponentRaster is throwing this even though the
data buffer is TYPE_INT, or (2) how to create a buffered image with a custom
data buffer without getting such an error?

Here's the code I'm using, where DataBufferIntFile is my file-referencing
DataBuffer:

    // from BufferedImage (for TYPE_INT_RGB)
    DirectColorModel cm = new DirectColorModel(24,
                                               0x00ff0000,   // Red
                                               0x0000ff00,   // Green
                                               0x000000ff,   // Blue
                                               0x0           // Alpha
                                               );
    DataBufferIntFile db = new DataBufferIntFile(dataFile);

    // from DirectColorModel.createCompatibleWritableRaster
    int[] bandmasks = new int[] {cm.getRedMask(),
                                 cm.getGreenMask(),
                                 cm.getBlueMask()};
    SinglePixelPackedSampleModel sm =
        new SinglePixelPackedSampleModel(db.getDataType(),
                                         width, height,
                                         bandmasks);
    WritableRaster wr = Raster.createWritableRaster(sm, db, new Point(0,0));
        ...

Thanks much,
Brian

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