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.


            float scale = 0.5f;
            RescaleOp rop = new RescaleOp(new float[]{scale, scale, scale, scale},
                                new float[]{0, 0, 0, 0},
                                null);
            BufferedImage image = rop.filter(iconImage, null);


            this.setDisabledIcon(new ImageIcon(image));


            super.setText(null);
        }

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            float scale = 0.5f;
            RescaleOp rop = new RescaleOp(new float[]{scale, scale, scale, scale},
                                new float[]{0, 0, 0, 0},
                                null);
            BufferedImage image = rop.filter(iconImage, null);


            this.setDisabledIcon(new ImageIcon(image));
        }


        if (icon != null) {

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    RescaleOp op = new RescaleOp(1, 1, null);
    
    // Src and dst rasters can be the same
    try
    {
      op.filter(r, r);
      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)
    BufferedImage dst = new BufferedImage(30, 40, BufferedImage.TYPE_INT_RGB);
    try
    {
      op.filter(r, dst.getRaster());
      harness.check(false);
    }
    catch (IllegalArgumentException e)
    {
      harness.check(true);

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    {
      harness.check(true);
    }
    
    // Null destination check
    WritableRaster dstRast = op.filter(r, null);
    harness.check(dstRast.getHeight(), r.getHeight());
    harness.check(dstRast.getWidth(), r.getWidth());
    harness.check(dstRast.getMinX(), r.getMinX());
    harness.check(dstRast.getMinY(), r.getMinY());
    harness.check(dstRast.getNumBands(), r.getNumBands());

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    harness.check(dstRast.getDataBuffer().getClass(), r.getDataBuffer().getClass());
    
    // Test positive & negative clipping behaviour
    img.getRaster().setSample(1, 1, 0, 1500);
    op = new RescaleOp(100, 0, null);
    dstRast = op.filter(r, null);
    double maxValue = Math.pow(2, r.getSampleModel().getSampleSize(0)) - 1;
    harness.check(dstRast.getSample(1, 1, 0), maxValue);
    
    op = new RescaleOp(1, -2000, null);
    dstRast = op.filter(r, null);

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    dstRast = op.filter(r, null);
    double maxValue = Math.pow(2, r.getSampleModel().getSampleSize(0)) - 1;
    harness.check(dstRast.getSample(1, 1, 0), maxValue);
    
    op = new RescaleOp(1, -2000, null);
    dstRast = op.filter(r, null);
    harness.check(dstRast.getSample(1, 1, 0), 0);
  }
  
  public void testRaster1(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);
    WritableRaster dest = op.filter(r, null);
    
    harness.check(dest.getSample(1, 1, 0), 137);    //rounded down from 137.5
    harness.check(dest.getSample(1, 1, 1), 145);
    harness.check(dest.getSample(1, 1, 3), 171);    //rounded down from 171.25
    harness.check(dest.getSample(1, 1, 2), 156);    //rounded down from 156.25

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    r.setSample(1, 3, 3, 90);
    
    RescaleOp op = new RescaleOp(new float[]{0.75f, 2.5f, -1f, 0f},
                             new float[]{25f, 2f, 1f, 0f},
                             null);
    WritableRaster dest = op.filter(r, null);
    
    harness.check(dest.getSample(1, 1, 0), 32);     //rounded down from 32.5 
    harness.check(dest.getSample(1, 1, 1), 52);
    harness.check(dest.getSample(1, 1, 2), 0);
    harness.check(dest.getSample(1, 1, 3), 0);

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    // Test mismatched arrays
    RescaleOp op = new RescaleOp(new float[]{1, 2, 3, 4}, new float[]{1, 2, 3}, null);
    try
    {
      op.filter(r, null);
      harness.check(false);
    }
    catch (IllegalArgumentException ex)
    {
      harness.check(true);

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