Examples of java.awt.image.LookupOp

java.awt.image.LookupOp
This class implements a lookup operation from the source to the destination. The LookupTable object may contain a single array or multiple arrays, subject to the restrictions below.
For Rasters, the lookup operates on bands. The number of lookup arrays may be one, in which case the same array is applied to all bands, or it must equal the number of Source Raster bands.
For BufferedImages, the lookup operates on color and alpha components. The number of lookup arrays may be one, in which case the same array is applied to all color (but not alpha) components. Otherwise, the number of lookup arrays may equal the number of Source color components, in which case no lookup of the alpha component (if present) is performed. If neither of these cases apply, the number of lookup arrays must equal the number of Source color components plus alpha components, in which case lookup is performed for all color and alpha components. This allows non-uniform rescaling of multi-band BufferedImages.
BufferedImage sources with premultiplied alpha data are treated in the same manner as non-premultiplied images for purposes of the lookup. That is, the lookup is done per band on the raw data of the BufferedImage source without regard to whether the data is premultiplied. If a color conversion is required to the destination ColorModel, the premultiplied state of both source and destination will be taken into account for this step.
Images with an IndexColorModel cannot be used.
If a RenderingHints object is specified in the constructor, the color rendering hint and the dithering hint may be used when color conversion is required.
This class allows the Source to be the same as the Destination. @version 10 Feb 1997 @see LookupTable @see java.awt.RenderingHints#KEY_COLOR_RENDERING @see java.awt.RenderingHints#KEY_DITHERING

      img = new BufferedImage(5, 5, BufferedImage.TYPE_INT_ARGB);
    createImage(img);
    
    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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                                        {112, 123, 114, 135, 148, 102},
                                        {212, 223, 214, 235, 248, 202}
                                       };
    
    ShortLookupTable t = new ShortLookupTable(0, lutarray);
    LookupOp op = new LookupOp(t, null);
    BufferedImage dst = new BufferedImage(5, 5, BufferedImage.TYPE_INT_ARGB);


    /* This causes Sun to throw an exception...
     * 
     * java.lang.IllegalArgumentException: Number of channels in the src (4)
     * does not match number of channels in the destination (2)
     * 
     * 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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                                        {212, 223, 214, 235, 248, 202},
                                        {62, 73, 64, 85, 98, 52}
                                       };
    
    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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    // We get the ArrayIndexOutOfBoundsException that we would expect when
    // using a ShortLookupTable...
    short[] lutarray = new short[] {0, 1, 2, 3, 4, 5, 6, 7, 8};
    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);
    }


    // But a ByteLookupTable will give us undetermined results
    // (is a native array overflowing in sun's implementation?)
    byte[] bytes = new byte[] {0, 1, 2, 3, 4, 5, 6, 7, 8};
    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
      harness.check(true);
    }


    // And a test for the behaviour when source and dest have a different
    // number of bands (since the constructor does not throw an exception)
    r.setSample(1, 1, 0, 5);
    r.setSample(1, 1, 1, 4);
    r.setSample(1, 1, 2, 3);
    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);
    }
    
    // Now try a destination with *more* bands
    img = new BufferedImage(5, 5, BufferedImage.TYPE_USHORT_GRAY);
    r = img.getRaster();
    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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{
  public void test(TestHarness harness)
  {
    byte[] bytes = new byte[] {(byte) 0xAA, (byte) 0xBB};
    ByteLookupTable t = new ByteLookupTable(0, bytes);
    LookupOp op = new LookupOp(t, null);
    Raster raster = Raster.createWritableRaster(
        new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE, 10, 20, 8), null);
    Raster dest = op.createCompatibleDestRaster(raster);
    harness.check(dest.getWidth(), 10);
    harness.check(dest.getHeight(), 20);
    harness.check(dest.getNumBands(), 1);
    harness.check(dest.getSampleModel() instanceof MultiPixelPackedSampleModel);
    harness.check(dest.getTransferType(), raster.getTransferType());
    harness.check(dest.getDataBuffer().getDataType(), raster.getDataBuffer().getDataType());
    harness.check(dest.getNumDataElements(), raster.getNumDataElements());
  
    // try null argument
    boolean pass = false;
    try
    {
      op.createCompatibleDestRaster(null);
    }
    catch (NullPointerException e)
    {
      pass = true;
    }
    harness.check(pass);
    
    // Try a different type
    raster = Raster.createBandedRaster(DataBuffer.TYPE_BYTE, 25, 40, 3, new Point(5, 5));
    Raster dst = op.createCompatibleDestRaster(raster);
    harness.check(dst.getNumBands(), raster.getNumBands());
    harness.check(dst.getTransferType(), raster.getTransferType());
    harness.check(dst.getDataBuffer().getDataType(), raster.getDataBuffer().getDataType());
    harness.check(dst.getNumDataElements(), raster.getNumDataElements());
    
    // Try a different number of bands
    raster = Raster.createBandedRaster(DataBuffer.TYPE_INT, 25, 40, 5, new Point(5, 5));
    dst = op.createCompatibleDestRaster(raster);
    harness.check(dst.getNumBands(), raster.getNumBands());
    harness.check(dst.getTransferType(), raster.getTransferType());
    harness.check(dst.getDataBuffer().getDataType(), raster.getDataBuffer().getDataType());
    harness.check(dst.getNumDataElements(), raster.getNumDataElements());
  }

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    harness.checkPoint("(BufferedImage)");
    BufferedImage image = new BufferedImage(10, 20, 
            BufferedImage.TYPE_INT_ARGB);
    byte[] bytes = new byte[] {(byte) 0xAA, (byte) 0xBB};
    ByteLookupTable t = new ByteLookupTable(0, bytes);
    LookupOp op = new LookupOp(t, null);
    Rectangle2D bounds = op.getBounds2D(image);
    harness.check(bounds.getWidth(), 10);
    harness.check(bounds.getHeight(), 20);
    
    // try null argument
    boolean pass = false;
    try
    {
      op.getBounds2D((BufferedImage) null);
    }
    catch (NullPointerException e)
    {
      pass = true;
    }

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  public void testMethod2(TestHarness harness)
  {
    harness.checkPoint("(Raster)");    
    byte[] bytes = new byte[] {(byte) 0xAA, (byte) 0xBB};
    ByteLookupTable t = new ByteLookupTable(0, bytes);
    LookupOp op = new LookupOp(t, null);
    Raster raster = Raster.createWritableRaster(
            new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE, 10, 20, 8), 
            null);
    Rectangle2D bounds = op.getBounds2D(raster);
    harness.check(bounds.getWidth(), 10);
    harness.check(bounds.getHeight(), 20);
    
    // try null argument
    boolean pass = false;
    try
    {
      op.getBounds2D((Raster) null);
    }
    catch (NullPointerException e)
    {
      pass = true;
    }

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    // Create an image to work on
    BufferedImage img = new BufferedImage(20, 20, BufferedImage.TYPE_USHORT_GRAY);
    
    byte[] bytes = new byte[] {(byte) 0xAA, (byte) 0xBB};
    ByteLookupTable t = new ByteLookupTable(0, bytes);
    LookupOp op = new LookupOp(t, null);
    
    // Simple tests
    BufferedImage dst = op.filter(img, null);
    harness.check(dst.getType(), op.createCompatibleDestImage(img, null).getType());
    
    dst = new BufferedImage(20, 20, BufferedImage.TYPE_USHORT_GRAY);
    try
    {
      dst = op.filter(img, dst);
      harness.check(true);
    }
    catch (IllegalArgumentException ex)
    {
      harness.check(false);
    }
    
    // Src and dst images can be the same
    try
    {
      op.filter(img, img);
      harness.check(true);
    }
    catch (IllegalArgumentException e)
    {
      harness.check(false);
    }
    finally
    {
      // Reset image for next test
      img = new BufferedImage(20, 20, BufferedImage.TYPE_USHORT_GRAY);
    }
    
    // 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);
    }
    
    // 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);
    }
    
    // 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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{
  public void test(TestHarness harness)
  {
    byte[] bytes = new byte[] {(byte) 0xAA, (byte) 0xBB};
    ByteLookupTable t = new ByteLookupTable(0, bytes);
    LookupOp op = new LookupOp(t, null);
    Point2D p = new Point2D.Double(1.0, 2.0);
    Point2D pp = new Point2D.Double();
    Point2D p1 = op.getPoint2D(p, pp);
    harness.check(p1, p);
    harness.check(p1 == pp);
    harness.check(p1 != p);
    
    // try null dest
    p1 = op.getPoint2D(p, null);
    harness.check(p1, p);
    harness.check(p1 != p); 
    
    // try src == dst
    p1 = op.getPoint2D(p, p);
    harness.check(p1, p);
    harness.check(p1 == p);
  }

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        for ( int counter = 0; counter < 256; counter++ )
           invertArray[ counter ] = ( byte )( 255 - counter );   
        
        // create filter to invert colors
        BufferedImageOp invertFilter = new LookupOp(
           new ByteLookupTable( 0, invertArray ), null );
        
        // apply filter to displayImage
        return invertFilter.filter( buff, null );


    }

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