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

  public void test(TestHarness harness)
  {
    harness.checkPoint("(int, int, int, DataBuffer)");
    SampleModel m = new SinglePixelPackedSampleModel(DataBuffer.TYPE_BYTE, 10, 
            20, new int[] { 224, 28, 3 });
    DataBuffer db = m.createDataBuffer();
    harness.check(m.getSampleDouble(1, 2, 0, db), 0);
    harness.check(m.getSampleDouble(1, 2, 1, db), 0);
    harness.check(m.getSampleDouble(1, 2, 2, db), 0);
    m.setPixel(1, 2, new int[] {1, 2, 3}, db);
    harness.check(m.getSampleDouble(1, 2, 0, db), 1);

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    // does negative size fail? no
    pass = true;
    try 
    {
      DataBuffer b1 = new DataBufferUShort(new short[] {1, 2}, -1, 0);
    }
    catch (NegativeArraySizeException e) 
    {
      pass = false;
    }

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  public void test(TestHarness harness)
  {
    harness.checkPoint("(int, int, int, DataBuffer)");
    SampleModel m = new SinglePixelPackedSampleModel(DataBuffer.TYPE_BYTE, 10, 
            20, new int[] { 224, 28, 3 });
    DataBuffer db = m.createDataBuffer();
    harness.check(m.getSample(1, 2, 0, db), 0);
    harness.check(m.getSample(1, 2, 1, db), 0);
    harness.check(m.getSample(1, 2, 2, db), 0);
    m.setPixel(1, 2, new int[] {1, 2, 3}, db);
    harness.check(m.getSample(1, 2, 0, db), 1);

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  public void test1(TestHarness harness)
  {
    MultiPixelPackedSampleModel m = new MultiPixelPackedSampleModel(
            DataBuffer.TYPE_INT, 10, 20, 8);
    DataBuffer db = m.createDataBuffer();
    db.setElem(3, 0xAABBCCDD);
    harness.check(m.getSample(0, 1, 0, db), 0xAA);
    harness.check(m.getSample(1, 1, 0, db), 0xBB);
    harness.check(m.getSample(2, 1, 0, db), 0xCC);
    harness.check(m.getSample(3, 1, 0, db), 0xDD);

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  public void test2(TestHarness harness)
  {
    MultiPixelPackedSampleModel m = new MultiPixelPackedSampleModel(
              DataBuffer.TYPE_INT, 10, 20, 8, 4, 16);
    DataBuffer db = m.createDataBuffer();
    db.setElem(5, 0xAABBCCDD);
    harness.check(m.getSample(0, 1, 0, db), 0x00);
    harness.check(m.getSample(1, 1, 0, db), 0x00);
    harness.check(m.getSample(2, 1, 0, db), 0xAA);
    harness.check(m.getSample(3, 1, 0, db), 0xBB);
    harness.check(m.getSample(4, 1, 0, db), 0xCC);

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public class getElem
  implements Testlet
{
  public void test(TestHarness h)
  {
    DataBuffer buf;
    short[] data = new short[] { -11, -22, -33, -44 };
    
    buf = new DataBufferUShort(new short[][] { data, data }, 2,
                               new int[] { 2, 0 });


    h.check(buf.getElem(0), 0x10000 - 33);    // Check #1.
    h.check(buf.getElem(1), 0x10000 - 44);    // Check #2.
    h.check(buf.getElem(0, 0), 0x10000 - 33); // Check #3.
    h.check(buf.getElem(0, 1), 0x10000 - 44); // Check #4.
    h.check(buf.getElem(1, 0), 0x10000 - 11); // Check #5.
    h.check(buf.getElem(1, 1), 0x10000 - 22); // Check #6.
    // new tests added by David Gilbert
    testGetElem1(h);
    testGetElem2(h);
    
  }

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public class getElem
  implements Testlet
{
  public void test(TestHarness h)
  {
    DataBuffer buf;
    byte[] data = new byte[] { -11, -22, -33, -44 };
    
    buf = new DataBufferByte(new byte[][] { data, data }, 2,
                             new int[] { 2, 0 });


    h.check(buf.getElem(0), 256 - 33);    // Check #1.
    h.check(buf.getElem(1), 256 - 44);    // Check #2.
    h.check(buf.getElem(0, 0), 256 - 33); // Check #3.
    h.check(buf.getElem(0, 1), 256 - 44); // Check #4.
    h.check(buf.getElem(1, 0), 256 - 11); // Check #5.
    h.check(buf.getElem(1, 1), 256 - 22); // Check #6.
    
    // new tests added by David Gilbert
    testGetElem1(h);
    testGetElem2(h);

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  public void test1(TestHarness harness)
  {
    MultiPixelPackedSampleModel m = new MultiPixelPackedSampleModel(
            DataBuffer.TYPE_INT, 10, 20, 8);
    DataBuffer db = m.createDataBuffer();
    db.setElem(3, 0xAABBCCDD);
    harness.check(m.getPixel(0, 1, (int[]) null, db)[0], 0xAA);
    harness.check(m.getPixel(1, 1, (int[]) null, db)[0], 0xBB);
    harness.check(m.getPixel(2, 1, (int[]) null, db)[0], 0xCC);
    harness.check(m.getPixel(3, 1, (int[]) null, db)[0], 0xDD);

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  public void testMethod1(TestHarness harness)
  {
    harness.checkPoint("(int, int, int[], DataBuffer)");
    SampleModel m = new SinglePixelPackedSampleModel(DataBuffer.TYPE_BYTE, 10, 
            20, new int[] { 224, 28, 3 });
    DataBuffer db = m.createDataBuffer();
    int[] pixel = new int[3];
    m.getPixel(1, 2, pixel, db);
    harness.check(Arrays.equals(pixel, new int[] {0, 0, 0}));
    m.setPixel(1, 2, new int[] {1, 2, 3}, db);
    m.getPixel(1, 2, pixel, db);
    harness.check(Arrays.equals(pixel, new int[] {1, 2, 3}));
    
    // if the incoming array is null, a new one is created
    pixel = m.getPixel(1, 2, (int[]) null, db);
    harness.check(Arrays.equals(pixel, new int[] {1, 2, 3}));
    
    // try null data buffer
    boolean pass = false;
    try
    {
      m.getPixel(1, 2, pixel, null);
    }
    catch (NullPointerException e)
    {
      pass = true;
    }
    harness.check(pass);
    
    // try with a MultiPixelPackedSampleModel
    m = new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE, 10, 20, 2);
    db = m.createDataBuffer();
    db.setElem(0, 27);
    harness.check(m.getPixel(0, 0, (int[]) null, db)[0], 0);
    harness.check(m.getPixel(1, 0, (int[]) null, db)[0], 1);
    harness.check(m.getPixel(2, 0, (int[]) null, db)[0], 2);
    harness.check(m.getPixel(3, 0, (int[]) null, db)[0], 3);
    db.setElem(3, 27);
    harness.check(m.getPixel(0, 1, (int[]) null, db)[0], 0);
    harness.check(m.getPixel(1, 1, (int[]) null, db)[0], 1);
    harness.check(m.getPixel(2, 1, (int[]) null, db)[0], 2);
    harness.check(m.getPixel(3, 1, (int[]) null, db)[0], 3);
    db.setElem(6, 0x18);
    db.setElem(9, 0x30);
    db.setElem(12, 0x1C);
    harness.check(m.getPixel(1, 2, (int[]) null, db)[0], 1);
    harness.check(m.getPixel(2, 2, (int[]) null, db)[0], 2);
    harness.check(m.getPixel(1, 3, (int[]) null, db)[0], 3);
    harness.check(m.getPixel(2, 3, (int[]) null, db)[0], 0);
    harness.check(m.getPixel(1, 4, (int[]) null, db)[0], 1);

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  public void test2(TestHarness harness)
  {
    MultiPixelPackedSampleModel m = new MultiPixelPackedSampleModel(
              DataBuffer.TYPE_INT, 10, 20, 8, 4, 16);
    DataBuffer db = m.createDataBuffer();
    db.setElem(5, 0xAABBCCDD);
    harness.check(m.getPixel(0, 1, (int[]) null, db)[0], 0x00);
    harness.check(m.getPixel(1, 1, (int[]) null, db)[0], 0x00);
    harness.check(m.getPixel(2, 1, (int[]) null, db)[0], 0xAA);
    harness.check(m.getPixel(3, 1, (int[]) null, db)[0], 0xBB);
    harness.check(m.getPixel(4, 1, (int[]) null, db)[0], 0xCC);

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