Examples of java.awt.image.RescaleOp.filter()

java.awt.image.RescaleOp.filter()
Rescales the source BufferedImage. If the color model in the source image is not the same as that in the destination image, the pixels will be converted in the destination. If the destination image is null, a BufferedImage will be created with the source ColorModel. An IllegalArgumentException may be thrown if the number of scaling factors/offsets in this object does not meet the restrictions stated in the class comments above, or if the source image has an IndexColorModel. @param src the BufferedImage to be filtered @param dst the destination for the filtering operation or null @return the filtered BufferedImage. @throws IllegalArgumentException if the ColorModelof src is an IndexColorModel, or if the number of scaling factors and offsets in this RescaleOp do not meet the requirements stated in the class comments.

    // Only the first value from both arrays is read if the offsets array
    // has only one value
    op = new RescaleOp(new float[]{1, 2, 3, 4}, new float[]{1}, null);
    try
    {
      WritableRaster dest = op.filter(r, null);
      harness.check(dest.getSample(1, 1, 0), 11);
      harness.check(dest.getSample(1, 1, 1), 21);
      harness.check(dest.getSample(1, 3, 0), 46);
      harness.check(dest.getSample(1, 3, 1), 61);
    }

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    // Same with a single-length factors array
    op = new RescaleOp(new float[]{0.5f}, new float[]{2, 3, 4, 5}, null);
    try
    {
      WritableRaster dest = op.filter(r, null);
      harness.check(dest.getSample(1, 1, 0), 7);
      harness.check(dest.getSample(1, 1, 1), 12);
      harness.check(dest.getSample(1, 3, 0), 24);
      harness.check(dest.getSample(1, 3, 1), 32);
    }

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    RescaleOp op = new RescaleOp(1, 1, null);
    
    // Src and dst images can be the same
    try
    {
      op.filter(img, img);
      harness.check(true);
    }
    catch (IllegalArgumentException e)
    {
      harness.check(false);

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    // Src and dst use different colorspaces (allowed, will cause implied
    // conversion)
    BufferedImage dst = new BufferedImage(20, 20, BufferedImage.TYPE_INT_RGB);
    try
    {
      op.filter(img, dst);
      harness.check(true);
    }
    catch (IllegalArgumentException e)
    {
      harness.check(false);

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    // Src and dst are different sizes (not allowed, unlike some other Ops)
    dst = new BufferedImage(30, 40, BufferedImage.TYPE_USHORT_GRAY);
    try
    {
      op.filter(img, dst);
      harness.check(false);
    }
    catch (IllegalArgumentException e)
    {
      harness.check(true);

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    {
      harness.check(true);
    }
    
    // Null destination check
    dst = op.filter(img, null);
    harness.check(dst.getType(),
                  op.createCompatibleDestImage(img, null).getType());
    
    // Test positive & negative clipping behaviour
    img.getRaster().setSample(1, 1, 0, 1500);

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                  op.createCompatibleDestImage(img, null).getType());
    
    // Test positive & negative clipping behaviour
    img.getRaster().setSample(1, 1, 0, 1500);
    op = new RescaleOp(100, 0, null);
    dst = op.filter(img, null);
    double maxValue = Math.pow(2, img.getColorModel().getComponentSize(0)) - 1;
    harness.check(dst.getRaster().getSample(1, 1, 0), maxValue);
    
    op = new RescaleOp(1, -2000, null);
    dst = op.filter(img, null);

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    dst = op.filter(img, null);
    double maxValue = Math.pow(2, img.getColorModel().getComponentSize(0)) - 1;
    harness.check(dst.getRaster().getSample(1, 1, 0), maxValue);
    
    op = new RescaleOp(1, -2000, null);
    dst = op.filter(img, null);
    harness.check(dst.getRaster().getSample(1, 1, 0), 0);
  }
  
  private void test1(TestHarness harness)
  {

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    r.setSample(1, 3, 1, 60);
    r.setSample(1, 3, 2, 70);
    r.setSample(1, 3, 3, 90);
    
    RescaleOp op = new RescaleOp(0.75f, 25f, null);
    BufferedImage dst = op.filter(img, null);
    WritableRaster dest = dst.getRaster();
    
    harness.check(dest.getSample(1, 1, 0), 137);    //rounded down from 137.5
    harness.check(dest.getSample(1, 1, 1), 145);

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     * I'm pretty sure it's a bug, but it's not one that's worth mimicing.
     * This test will not run on Sun.
     */ 
    try
    {
      BufferedImage dst = op.filter(img, null);
      WritableRaster dest = dst.getRaster();
      
      harness.check(dest.getSample(1, 1, 0), 32);   //rounded down from 32.5
      harness.check(dest.getSample(1, 1, 1), 52);

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