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

java.awt.image.LookupOp.filter()
Performs a lookup operation on a 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 an appropriate ColorModel. An IllegalArgumentException might be thrown if the number of arrays in the LookupTable does not meet the restrictions stated in the class comment above, or if the source image has an IndexColorModel. @param src the BufferedImage to be filtered @param dst the BufferedImage in which to store the results of the filter operation @return the filtered BufferedImage. @throws IllegalArgumentException if the number of arrays in theLookupTable does not meet the restrictions described in the class comments, or if the source image has an IndexColorModel.

    
    // Src and dst are different sizes - not allowed
    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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    // Src and dst have different tpyes (allowed)
    dst = new BufferedImage(20, 20, BufferedImage.TYPE_BYTE_GRAY);
    try
    {
      op.filter(img, dst);
      harness.check(true);
    }
    catch (IllegalArgumentException e)
    {
      harness.check(false);

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    // src and dst can even have different number of bands
    dst = new BufferedImage(20, 20, BufferedImage.TYPE_INT_ARGB);
    try
    {
      op.filter(img, dst);
      harness.check(true);
      harness.check(img.getType(), BufferedImage.TYPE_USHORT_GRAY);
      harness.check(dst.getType(), BufferedImage.TYPE_INT_ARGB);
    }
    catch (IllegalArgumentException ex)

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    byte[] bytes = new byte[] {12, 23, 14, 35, 48, 2};
    ByteLookupTable t = new ByteLookupTable(0, bytes);
    LookupOp op = new LookupOp(t, null);
    
    BufferedImage dst = new BufferedImage(5, 5, BufferedImage.TYPE_INT_ARGB);
    dst = op.filter(img, dst);
    WritableRaster dest = dst.getRaster();
    
    harness.check(img.isAlphaPremultiplied(), premultiply);
    harness.check(dst.isAlphaPremultiplied(), false);

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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
    {
      dst = op.filter(img, dst);
      WritableRaster dest = dst.getRaster();
      
      harness.check(img.isAlphaPremultiplied(), premultiply);
      harness.check(dst.isAlphaPremultiplied(), false);

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    ShortLookupTable t = new ShortLookupTable(0, lutarray);
    LookupOp op = new LookupOp(t, null);
    
    BufferedImage dst = new BufferedImage(5, 5, BufferedImage.TYPE_INT_ARGB);
    dst = op.filter(img, dst);
    WritableRaster dest = dst.getRaster();
    
    harness.check(img.isAlphaPremultiplied(), premultiply);
    harness.check(dst.isAlphaPremultiplied(), false);

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    ShortLookupTable t = new ShortLookupTable(0, lutarray);
    LookupOp op = new LookupOp(t, null);
    
    try
    {
      op.filter(img, null);
      harness.check(false);
    }
    catch (ArrayIndexOutOfBoundsException ex)
    {
      harness.check(true);

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    ByteLookupTable t2 = new ByteLookupTable(0, bytes);
    op = new LookupOp(t2, null);
    
    try
    {
      op.filter(img, null);
      harness.check(true);
    }
    catch (ArrayIndexOutOfBoundsException ex)
    {
      // Allow an exception to be thrown anyways, since it makes more sense

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    r.setSample(1, 1, 3, 2);
    BufferedImage dst = new BufferedImage(5, 5, BufferedImage.TYPE_USHORT_GRAY);
    try
    {
      // It doesn't throw an exception...
      op.filter(img, dst);
      harness.check(true);
    }
    catch (IllegalArgumentException ex)
    {
      harness.check(false);

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    r.setSample(1, 1, 0, 5);
    dst = new BufferedImage(5, 5, BufferedImage.TYPE_INT_ARGB);
    try
    {
      // It doesn't throw an exception either...
      op.filter(img, dst);
      harness.check(true);
    }
    catch (IllegalArgumentException ex)
    {
      harness.check(false);

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