Examples of java.awt.image.DataBuffer

java.awt.image.DataBuffer
This class exists to wrap one or more data arrays. Each data array in the DataBuffer is referred to as a bank. Accessor methods for getting and setting elements of the DataBuffer's banks exist with and without a bank specifier. The methods without a bank specifier use the default 0th bank. The DataBuffer can optionally take an offset per bank, so that data in an existing array can be used even if the interesting data doesn't start at array location zero. Getting or setting the 0th element of a bank, uses the (0+offset)th element of the array. The size field specifies how much of the data array is available for use. Size + offset for a given bank should never be greater than the length of the associated data array. The data type of a data buffer indicates the type of the data array(s) and may also indicate additional semantics, e.g. storing unsigned 8-bit data in elements of a byte array. The data type may be TYPE_UNDEFINED or one of the types defined below. Other types may be added in the future. Generally, an object of class DataBuffer will be cast down to one of its data type specific subclasses to access data type specific methods for improved performance. Currently, the Java 2D(tm) API image classes use TYPE_BYTE, TYPE_USHORT, TYPE_INT, TYPE_SHORT, TYPE_FLOAT, and TYPE_DOUBLE DataBuffers to store image data. @see java.awt.image.Raster @see java.awt.image.SampleModel


    private WritableRaster createRaster(int width, int height, int bands,
                                        int scanlineStride,
                                        int bitDepth) {


        DataBuffer dataBuffer;
        WritableRaster ras = null;
        Point origin = new Point(0, 0);
        if ((bitDepth < 8) && (bands == 1)) {
            dataBuffer = new DataBufferByte(height*scanlineStride);
            ras = Raster.createPackedRaster(dataBuffer,

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        // Create a 1-row tall Raster to hold the data
        WritableRaster passRow =
            createRaster(passWidth, 1, inputBands,
                         eltsPerRow,
                         bitDepth);
        DataBuffer dataBuffer = passRow.getDataBuffer();
        int type = dataBuffer.getDataType();
        byte[] byteData = null;
        short[] shortData = null;
        if (type == DataBuffer.TYPE_BYTE) {
            byteData = ((DataBufferByte)dataBuffer).getData();
        } else {

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    private boolean optimizedWriteTo(OutputStream out)
            throws IOException {
        if (this.firstTileDump) {
            Raster raster = image.getTile(0, 0);
            DataBuffer buffer = raster.getDataBuffer();
            if (buffer instanceof DataBufferByte) {
                byte[] bytes = ((DataBufferByte) buffer).getData();
                // see determineEncodingColorModel() to see why we permute B and R here
                if (isBGR) {
                    for (int i = 0; i < bytes.length; i += 3) {

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                }
            } else if (cm instanceof ComponentColorModel
                    && (numComponents == 3 || (enableCMYK && numComponents == 4))
                    && !cm.hasAlpha()) {
                Raster raster = image.getTile(0, 0);
                DataBuffer buffer = raster.getDataBuffer();
                SampleModel sampleModel = raster.getSampleModel();
                if (sampleModel instanceof PixelInterleavedSampleModel) {
                    PixelInterleavedSampleModel piSampleModel;
                    piSampleModel = (PixelInterleavedSampleModel)sampleModel;
                    int[] offsets = piSampleModel.getBandOffsets();
                    for (int i = 0; i < offsets.length; i++) {
                        if (offsets[i] != i && offsets[i] != offsets.length - 1 - i) {
                            //Don't encode directly as samples are not next to each other
                            //i.e. offsets are not 012 (RGB) or 0123 (CMYK)
                            // let also pass 210 BGR and 3210 (KYMC); 3210 will be skipped below
                            // if 210 (BGR) the B and R bytes will be permuted later in optimizeWriteTo()
                            return;
                        }
                    }
                    // check if we are in a BGR case; this is added here as a workaround for bug fix
                    // http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6549882 that causes some PNG
                    // images to be loaded as BGR with the consequence that performance was being impacted
                    this.isBGR = false;
                    if (offsets.length == 3 && offsets[0] == 2 && offsets[1] == 1 && offsets[2] == 0) {
                        this.isBGR = true;
                    }
                    // make sure we did not get here due to a KMYC image
                    if (offsets.length == 4 && offsets[0] == 3 && offsets[1] == 2 && offsets[2] == 1
                            && offsets[3] == 0) {
                        return;
                    }
                }
                if (cm.getTransferType() == DataBuffer.TYPE_BYTE
                        && buffer.getOffset() == 0
                        && buffer.getNumBanks() == 1) {
                    this.firstTileDump = true;
                    this.encodedColorModel = cm;
                }
            }
        }

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    public void encodeAlpha(OutputStream out) throws IOException {
        if (!hasAlpha()) {
            throw new IllegalStateException("Image doesn't have an alpha channel");
        }
        Raster alpha = GraphicsUtil.getAlphaRaster(image);
        DataBuffer buffer = alpha.getDataBuffer();
        if (buffer instanceof DataBufferByte) {
            out.write(((DataBufferByte)buffer).getData());
        } else {
            throw new UnsupportedOperationException(
                    "Alpha raster not supported: " + buffer.getClass().getName());
        }
    }

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                    new int[] {8, 8, 8},
                    false, false,
                    ColorModel.OPAQUE, DataBuffer.TYPE_BYTE);
            SampleModel sampleModel = new PixelInterleavedSampleModel(
                    DataBuffer.TYPE_BYTE, w, h, 3, w * 3, new int[] {0, 1, 2});
            DataBuffer dbuf = new DataBufferByte(raw, w * h * 3);


            WritableRaster raster = Raster.createWritableRaster(sampleModel,
                    dbuf, null);


            java.awt.Image awtImage;

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                    ColorModel.OPAQUE, DataBuffer.TYPE_BYTE);
            int imgw = fopimage.getWidth();
            int imgh = fopimage.getHeight();
            SampleModel sampleModel = new PixelInterleavedSampleModel(
                    DataBuffer.TYPE_BYTE, imgw, imgh, 3, imgw * 3, new int[] {0, 1, 2});
            DataBuffer dbuf = new DataBufferByte(imgmap, imgw * imgh * 3);


            WritableRaster raster = Raster.createWritableRaster(sampleModel,
                    dbuf, null);


            // Combine the color model and raster into a buffered image

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                false, false,
                ColorModel.OPAQUE, DataBuffer.TYPE_BYTE);
        SampleModel sampleModel = new PixelInterleavedSampleModel(
                DataBuffer.TYPE_BYTE, image.getWidth(), image.getHeight(), 3, image.getWidth() * 3, 
                new int[] {0, 1, 2});
        DataBuffer dbuf = new DataBufferByte(image.getBitmaps(), 
                image.getWidth() * image.getHeight() * 3);


        WritableRaster raster = Raster.createWritableRaster(sampleModel,
                dbuf, null);

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        int[] idata = null;


        SampleModel sampleModel = getSampleModel();
        WritableRaster tile = makeTile(tileX, tileY);


        DataBuffer buffer = tile.getDataBuffer();


        int dataType = sampleModel.getDataType();
        if (dataType == DataBuffer.TYPE_BYTE) {
            bdata = ((DataBufferByte)buffer).getData();
        } else if (dataType == DataBuffer.TYPE_USHORT) {

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             ras.getMinY()-ras.getSampleModelTranslateY(),
             ras.getWidth(), ras.getHeight(),
             minX, minY, null);


        // Use System.arraycopy to copy the data between the two...
        DataBuffer srcDB = ras.getDataBuffer();
        DataBuffer retDB = ret.getDataBuffer();
        if (srcDB.getDataType() != retDB.getDataType()) {
            throw new IllegalArgumentException
                ("New DataBuffer doesn't match original");
        }
        int len   = srcDB.getSize();
        int banks = srcDB.getNumBanks();

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