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 void test2(TestHarness harness)
  {
    harness.checkPoint("(int, int, int, float, DataBuffer)");  


    DataBuffer db = new DataBufferFloat(12);
    ComponentSampleModel m = new ComponentSampleModel(DataBuffer.TYPE_FLOAT,
            3, 2, 2, 6, new int[] {0, 1});
    m.setSample(2, 1, 0, 99.9f, db);
    harness.check(db.getElem(0, 10), 99.0f);
    m.setSample(2, 1, 1, 88.8f, db);
    harness.check(db.getElem(0, 11), 88.0f);
    
    // what happens if the data buffer doesn't hold floats?
    DataBuffer db2 = new DataBufferInt(12);
    m.setSample(2, 1, 0, 99.9f, db2);
    harness.check(db2.getElem(0, 10), 99);
    m.setSample(2, 1, 1, 88.8f, db2);
    harness.check(db2.getElem(0, 11), 88); 
     
    // check that a null data buffer generates a NullPointerException
    boolean pass = false;
    try
      {

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    harness.checkPoint("(int, int, Object, DataBuffer(Byte))");
    SinglePixelPackedSampleModel m1 = new SinglePixelPackedSampleModel(
      DataBuffer.TYPE_BYTE, 2, 3, new int[] { 0xF0, 0x0F }
    );
    byte[] b = new byte[] { (byte) 0x11, (byte) 0x22, (byte) 0x33, (byte) 0x44, (byte) 0x55, (byte) 0x66 };
    DataBuffer db = new DataBufferByte(b, 6);  


    // set a value
    m1.setDataElements(0, 0, new byte[] { (byte) 0x77 }, db);
    m1.setDataElements(1, 0, new byte[] { (byte) 0x88 }, db);
    m1.setDataElements(0, 1, new byte[] { (byte) 0x99 }, db);
    m1.setDataElements(1, 1, new byte[] { (byte) 0xAA }, db);
    m1.setDataElements(0, 2, new byte[] { (byte) 0xBB }, db);
    m1.setDataElements(1, 2, new byte[] { (byte) 0xCC }, db);
    harness.check(db.getElem(0), 0x77);
    harness.check(db.getElem(1), 0x88);
    harness.check(db.getElem(2), 0x99);
    harness.check(db.getElem(3), 0xAA);
    harness.check(db.getElem(4), 0xBB);
    harness.check(db.getElem(5), 0xCC);
    
    // set a value with non-standard scanline stride 
    SinglePixelPackedSampleModel m2 = new SinglePixelPackedSampleModel(
      DataBuffer.TYPE_BYTE, 2, 2, 3, new int[] { 0xF0, 0x0F }
    );
    m2.setDataElements(0, 0, new byte[] { (byte) 0x11 }, db);
    m2.setDataElements(1, 0, new byte[] { (byte) 0x22 }, db);
    m2.setDataElements(0, 1, new byte[] { (byte) 0x33 }, db);
    m2.setDataElements(1, 1, new byte[] { (byte) 0x44 }, db);
    harness.check(db.getElem(0), 0x11);
    harness.check(db.getElem(1), 0x22);
    harness.check(db.getElem(3), 0x33);
    harness.check(db.getElem(4), 0x44);
      
    // set a value with x < 0
    try
    {
      m1.setDataElements(-1, 0, new byte[] { (byte) 0x99}, db);

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  private void test3(TestHarness harness)
  {
    harness.checkPoint("(int, int, int, int, DataBuffer)");  
    
    DataBuffer db = new DataBufferInt(12);
    ComponentSampleModel m = new ComponentSampleModel(DataBuffer.TYPE_INT,
            3, 2, 2, 6, new int[] {0, 1});
    m.setSample(2, 1, 0, 99, db);
    harness.check(db.getElem(0, 10), 99);
    m.setSample(2, 1, 1, 88, db);
    harness.check(db.getElem(0, 11), 88);
    
    // what happens if the data buffer doesn't hold integers?
    DataBuffer db2 = new DataBufferByte(12);
    m.setSample(2, 1, 0, 99, db2);
    harness.check(db2.getElem(0, 10), 99);
    m.setSample(2, 1, 1, 888, db2);
    harness.check(db2.getElem(0, 11), 120);  // (byte) 888
    
    // check that a null data buffer generates a NullPointerException
    boolean pass = false;
    try
      {

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{
  public void test(TestHarness harness)
  {
    MultiPixelPackedSampleModel m = new MultiPixelPackedSampleModel(
        DataBuffer.TYPE_INT, 10, 20, 8);
    DataBuffer db = m.createDataBuffer();
    harness.check(db.getDataType(), DataBuffer.TYPE_INT);
    harness.check(db.getNumBanks(), 1);
    harness.check(db.getSize(), 60);


    MultiPixelPackedSampleModel m2 = new MultiPixelPackedSampleModel(
            DataBuffer.TYPE_INT, 10, 20, 8, 4, 16);
    DataBuffer db2 = m2.createDataBuffer();
    harness.check(db2.getDataType(), DataBuffer.TYPE_INT);
    harness.check(db2.getNumBanks(), 1);
    harness.check(db2.getSize(), 81);


    MultiPixelPackedSampleModel m3 = new MultiPixelPackedSampleModel(
            DataBuffer.TYPE_BYTE, 10, 20, 8);
    DataBuffer db3 = m3.createDataBuffer();
    harness.check(db3.getDataType(), DataBuffer.TYPE_BYTE);
    harness.check(db3.getNumBanks(), 1);
    harness.check(db3.getSize(), 200);


    MultiPixelPackedSampleModel m4 = new MultiPixelPackedSampleModel(
            DataBuffer.TYPE_BYTE, 10, 20, 8, 11, 16);
    DataBuffer db4 = m4.createDataBuffer();
    harness.check(db4.getDataType(), DataBuffer.TYPE_BYTE);
    harness.check(db4.getNumBanks(), 1);
    harness.check(db4.getSize(), 222);
  
    MultiPixelPackedSampleModel m5 = new MultiPixelPackedSampleModel(
            DataBuffer.TYPE_USHORT, 10, 20, 8);
    DataBuffer db5 = m5.createDataBuffer();
    harness.check(db5.getDataType(), DataBuffer.TYPE_USHORT);
    harness.check(db5.getNumBanks(), 1);
    harness.check(db5.getSize(), 100);


    MultiPixelPackedSampleModel m6 = new MultiPixelPackedSampleModel(
            DataBuffer.TYPE_USHORT, 10, 20, 8, 6, 16);
    DataBuffer db6 = m6.createDataBuffer();
    harness.check(db6.getDataType(), DataBuffer.TYPE_USHORT);
    harness.check(db6.getNumBanks(), 1);
    harness.check(db6.getSize(), 121);
  }

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    harness.checkPoint("(int, int, Object, DataBuffer(UShort))");
    SinglePixelPackedSampleModel m1 = new SinglePixelPackedSampleModel(
      DataBuffer.TYPE_USHORT, 2, 3, new int[] { 0xFF00, 0x00FF }
    );
    short[] s = new short[] { (short) 0x1111, (short) 0x2222, (short) 0x3333, (short) 0x4444, (short) 0x5555, (short) 0x6666 };
    DataBuffer db = new DataBufferUShort(s, 6);  


    // set a value
    m1.setDataElements(0, 0, new short[] { (short) 0x7777 }, db);
    m1.setDataElements(1, 0, new short[] { (short) 0x8888 }, db);
    m1.setDataElements(0, 1, new short[] { (short) 0x9999 }, db);
    m1.setDataElements(1, 1, new short[] { (short) 0xAAAA }, db);
    m1.setDataElements(0, 2, new short[] { (short) 0xBBBB }, db);
    m1.setDataElements(1, 2, new short[] { (short) 0xCCCC }, db);
    harness.check(db.getElem(0), 0x7777);
    harness.check(db.getElem(1), 0x8888);
    harness.check(db.getElem(2), 0x9999);
    harness.check(db.getElem(3), 0xAAAA);
    harness.check(db.getElem(4), 0xBBBB);
    harness.check(db.getElem(5), 0xCCCC);
      
    // set a value with non-standard scanline stride 
    SinglePixelPackedSampleModel m2 = new SinglePixelPackedSampleModel(
      DataBuffer.TYPE_USHORT, 2, 2, 3, new int[] { 0xFF00, 0x00FF }
    );
    m2.setDataElements(0, 0, new short[] { (short) 0x1111 }, db);
    m2.setDataElements(1, 0, new short[] { (short) 0x2222 }, db);
    m2.setDataElements(0, 1, new short[] { (short) 0x3333 }, db);
    m2.setDataElements(1, 1, new short[] { (short) 0x4444 }, db);
    harness.check(db.getElem(0), 0x1111);
    harness.check(db.getElem(1), 0x2222);
    harness.check(db.getElem(3), 0x3333);
    harness.check(db.getElem(4), 0x4444);
        
    // set a value with x < 0
    try
    {
      m1.setDataElements(-1, 0, new short[] { (short) 0x9999 }, db);

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    harness.checkPoint("(int, int, Object, DataBuffer(Int))");
    SinglePixelPackedSampleModel m1 = new SinglePixelPackedSampleModel(
      DataBuffer.TYPE_INT, 2, 3, new int[] { 0xFFFF00, 0x00FFFF }
    );
    int[] i = new int[] { (int) 0x11111111, (int) 0x22222222, (int) 0x33333333, (int) 0x44444444, (int) 0x55555555, (int) 0x66666666 };
    DataBuffer db = new DataBufferInt(i, 6);  


    // set a value
    m1.setDataElements(0, 0, new int[] { (int) 0x77777777 }, db);
    m1.setDataElements(1, 0, new int[] { (int) 0x88888888 }, db);
    m1.setDataElements(0, 1, new int[] { (int) 0x99999999 }, db);
    m1.setDataElements(1, 1, new int[] { (int) 0xAAAAAAAA }, db);
    m1.setDataElements(0, 2, new int[] { (int) 0xBBBBBBBB }, db);
    m1.setDataElements(1, 2, new int[] { (int) 0xCCCCCCCC }, db);
    harness.check(db.getElem(0), 0x77777777);
    harness.check(db.getElem(1), 0x88888888);
    harness.check(db.getElem(2), 0x99999999);
    harness.check(db.getElem(3), 0xAAAAAAAA);
    harness.check(db.getElem(4), 0xBBBBBBBB);
    harness.check(db.getElem(5), 0xCCCCCCCC);
        
    // set a value with non-standard scanline stride 
    SinglePixelPackedSampleModel m2 = new SinglePixelPackedSampleModel(
      DataBuffer.TYPE_INT, 2, 2, 3, new int[] { 0xFFFF00, 0x00FFFF }
    );
    m2.setDataElements(0, 0, new int[] { (int) 0x11111111 }, db);
    m2.setDataElements(1, 0, new int[] { (int) 0x22222222 }, db);
    m2.setDataElements(0, 1, new int[] { (int) 0x33333333 }, db);
    m2.setDataElements(1, 1, new int[] { (int) 0x44444444 }, db);
    harness.check(db.getElem(0), 0x11111111);
    harness.check(db.getElem(1), 0x22222222);
    harness.check(db.getElem(3), 0x33333333);
    harness.check(db.getElem(4), 0x44444444);
          
    // set a value with x < 0
    try
    {
      m1.setDataElements(-1, 0, new int[] { (int) 0x9999 }, db);

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public class getDataElements implements Testlet
{
  public void test(TestHarness harness)
  {
    DataBuffer db = new DataBufferInt(12);
    for (int i = 0; i < 12; i++)
      db.setElem(i, i);
    ComponentSampleModel m = new ComponentSampleModel(DataBuffer.TYPE_INT,
            3, 2, 2, 6, new int[] {0, 1});
    Object elements = m.getDataElements(0, 0, 2, 1, null, db);
    int[] de = (int[]) elements;
    harness.check(de.length, 4);

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public class setPixel implements Testlet
{
  public void test(TestHarness harness)
  {
    DataBuffer db = new DataBufferInt(12);
    int[] pixel = new int[] {11, 22};
    ComponentSampleModel m = new ComponentSampleModel(DataBuffer.TYPE_INT,
            3, 2, 2, 6, new int[] {0, 1});
    m.setPixel(1, 1, pixel, db);
    harness.check(db.getElem(0, 8), 11);
    harness.check(db.getElem(0, 9), 22);
        
    // check that a null pixel array generates a NullPointerException
    boolean pass = false;
    try
      {

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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.getSampleFloat(1, 2, 0, db), 0);
    harness.check(m.getSampleFloat(1, 2, 1, db), 0);
    harness.check(m.getSampleFloat(1, 2, 2, db), 0);
    m.setPixel(1, 2, new int[] {1, 2, 3}, db);
    harness.check(m.getSampleFloat(1, 2, 0, db), 1);

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{
  public void test(TestHarness harness)
  {
    ComponentSampleModel m = new ComponentSampleModel(DataBuffer.TYPE_BYTE, 5, 
            10, 3, 16, new int[] {0, 1, 2});
    DataBuffer db = m.createDataBuffer();
    harness.check(db.getNumBanks(), 1);
    db.setElem(0, 16, 0xAA);
    db.setElem(0, 17, 0xBB);
    db.setElem(0, 18, 0xCC);
    harness.check(m.getSample(0, 1, 0, db), 0xAA);
    harness.check(m.getSample(0, 1, 1, db), 0xBB);
    harness.check(m.getSample(0, 1, 2, db), 0xCC);
    
    // try negative x

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