Examples of java.awt.image.SampleModel

java.awt.image.SampleModel
This abstract class defines an interface for extracting samples of pixels in an image. All image data is expressed as a collection of pixels. Each pixel consists of a number of samples. A sample is a datum for one band of an image and a band consists of all samples of a particular type in an image. For example, a pixel might contain three samples representing its red, green and blue components. There are three bands in the image containing this pixel. One band consists of all the red samples from all pixels in the image. The second band consists of all the green samples and the remaining band consists of all of the blue samples. The pixel can be stored in various formats. For example, all samples from a particular band can be stored contiguously or all samples from a single pixel can be stored contiguously.
Subclasses of SampleModel specify the types of samples they can represent (e.g. unsigned 8-bit byte, signed 16-bit short, etc.) and may specify how the samples are organized in memory. In the Java 2D(tm) API, built-in image processing operators may not operate on all possible sample types, but generally will work for unsigned integral samples of 16 bits or less. Some operators support a wider variety of sample types.
A collection of pixels is represented as a Raster, which consists of a DataBuffer and a SampleModel. The SampleModel allows access to samples in the DataBuffer and may provide low-level information that a programmer can use to directly manipulate samples and pixels in the DataBuffer.
This class is generally a fall back method for dealing with images. More efficient code will cast the SampleModel to the appropriate subclass and extract the information needed to directly manipulate pixels in the DataBuffer. @see java.awt.image.DataBuffer @see java.awt.image.Raster @see java.awt.image.ComponentSampleModel @see java.awt.image.PixelInterleavedSampleModel @see java.awt.image.BandedSampleModel @see java.awt.image.MultiPixelPackedSampleModel @see java.awt.image.SinglePixelPackedSampleModel

                             LookupTableJAI table) {
        super(source, layout, config, true);


        this.table = table;


        SampleModel sm = source.getSampleModel();  // source sample model


        if (sampleModel.getTransferType() != table.getDataType() ||
            sampleModel.getNumBands() !=
                table.getDestNumBands(sm.getNumBands())) {
            /*
             * The current SampleModel is not suitable for the supplied
             * source and lookup table. Create a suitable SampleModel
             * and ColorModel for the destination image.
             */

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        Rectangle srcRect = mapDestRect(destRect, 0);


        int srcTag = MediaLibAccessor.findCompatibleTag(null, source);
        int dstTag = MediaLibAccessor.findCompatibleTag(null, dest);


        SampleModel sm = source.getSampleModel();
        if (sm.getNumBands() > 1) {
            int srcCopy = srcTag & MediaLibAccessor.COPY_MASK;
            int dstCopy = dstTag & MediaLibAccessor.COPY_MASK;


            int srcDtype = srcTag & MediaLibAccessor.DATATYPE_MASK;
            int dstDtype = dstTag & MediaLibAccessor.DATATYPE_MASK;

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      return true;


        RenderedImage src1 = args.getRenderedSource(0);
        RenderedImage src2 = args.getRenderedSource(1);


        SampleModel s1sm = src1.getSampleModel();
        SampleModel s2sm = src2.getSampleModel();
        if (s1sm.getNumBands() != s2sm.getNumBands() ||
            s1sm.getTransferType() != s2sm.getTransferType()) {
            msg.append(getName() + " " +
                       JaiI18N.getString("CompositeDescriptor8"));
            return false;
        }


        /* Validate Parameters. */
  RenderedImage afa1 = (RenderedImage)args.getObjectParameter(0);
        if (src1.getMinX() != afa1.getMinX() ||
            src1.getMinY() != afa1.getMinY() ||
            src1.getWidth() != afa1.getWidth() ||
            src1.getHeight() != afa1.getHeight()) {
            msg.append(getName() + " " +
                       JaiI18N.getString("CompositeDescriptor12"));
            return false;
        }


        SampleModel a1sm = afa1.getSampleModel();
        if (s1sm.getTransferType() != a1sm.getTransferType()) {
            msg.append(getName() + " " +
                       JaiI18N.getString("CompositeDescriptor13"));
            return false;
        }


  RenderedImage afa2 = (RenderedImage)args.getObjectParameter(1);
        if (afa2 != null) {
            if (src2.getMinX() != afa2.getMinX() ||
                src2.getMinY() != afa2.getMinY() ||
                src2.getWidth() != afa2.getWidth() ||
                src2.getHeight() != afa2.getHeight()) {
                msg.append(getName() + " " +
                           JaiI18N.getString("CompositeDescriptor15"));
                return false;
            }
        
            SampleModel a2sm = afa2.getSampleModel();
            if (s2sm.getTransferType() != a2sm.getTransferType()) {
                msg.append(getName() + " " +
                           JaiI18N.getString("CompositeDescriptor16"));
                return false;
            }
        }

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        if (srcs != null) {
           tagIDs = new int[srcs.length + 1];
        } else {
           tagIDs = new int[1];
  }
        SampleModel dstSampleModel = dst.getSampleModel();
        int dstDataType = dstSampleModel.getTransferType();


        int defaultDataType = dstDataType; 
        boolean binaryDst = ImageUtil.isBinary(dstSampleModel);
        if (binaryDst) {
            defaultDataType = DataBuffer.TYPE_BYTE;
        } else if((dstDataType == DataBuffer.TYPE_BYTE) ||
            (dstDataType == DataBuffer.TYPE_USHORT) ||
            (dstDataType == DataBuffer.TYPE_SHORT)) {
            defaultDataType = DataBuffer.TYPE_INT;
        }


        // use highest precision datatype of all srcs & dst
        if (srcs != null) {
            int numSources = srcs.length;
            int i;
            for (i = 0; i < numSources; i++) {
                SampleModel srcSampleModel = srcs[i].getSampleModel();
                int srcDataType = srcSampleModel.getTransferType();
                if (!(binaryDst && ImageUtil.isBinary(srcSampleModel)) &&
                    srcDataType > defaultDataType) {
                    defaultDataType = srcDataType;
                }
            }
        }


        // Set the tag. For binary data at this point this should
        // equal DataBuffer.TYPE_BYTE | COPIED.
        int tagID = defaultDataType | COPIED;
 
        if (dstSampleModel instanceof ComponentSampleModel) {
            if (srcs != null) {
               int numSources = srcs.length;
               int i;
               for (i = 0; i < numSources; i++) {
                   SampleModel srcSampleModel = srcs[i].getSampleModel();
                   int srcDataType = srcSampleModel.getTransferType();
                   if (!(srcSampleModel instanceof ComponentSampleModel) ||
                       (srcDataType != dstDataType)) {
                       break;
                   }
               }

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        ColorModel colorModel = im.getColorModel();
        if (colorModel instanceof IndexColorModel) {
            return new PNGEncodeParam.Palette();
        }


        SampleModel sampleModel = im.getSampleModel();
        int numBands = sampleModel.getNumBands();


        if (numBands == 1 || numBands == 2) {
            return new PNGEncodeParam.Gray();
        } else {
            return new PNGEncodeParam.RGB();

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            !dataNature.equals(DFTDescriptor.REAL_TO_COMPLEX);
        boolean isComplexDest =
            !dataNature.equals(DFTDescriptor.COMPLEX_TO_REAL);


        // Get the number of source bands.
        SampleModel srcSampleModel = source.getSampleModel();
        int numSourceBands = srcSampleModel.getNumBands();


        // Check for mediaLib support of this source.
        if((isComplexSource && numSourceBands != 2) ||
           (!isComplexSource && numSourceBands != 1)) {
            // This should never occur due to checks in
            // MlibDFTRIF and MlibIDFTRIF.
            throw new RuntimeException(JaiI18N.getString("MlibDFTOpImage0"));
        }


        // Create an ImageLayout or clone the one passed in.
        ImageLayout il = layout == null ?
            new ImageLayout() : (ImageLayout)layout.clone();


        // Force the origin to coincide with that of the source.
        il.setMinX(source.getMinX());
        il.setMinY(source.getMinY());


        // Recalculate the non-unity dimensions to be a positive power of 2.
        // XXX This calculation should not be effected if an implementation
        // of the FFT which supports arbitrary dimensions is used.
        int currentWidth = il.getWidth(source);
        int currentHeight = il.getHeight(source);
        int newWidth;
        int newHeight;
        if(currentWidth == 1 && currentHeight == 1) {
            newWidth = newHeight = 1;
        } else if(currentWidth == 1 && currentHeight > 1) {
            newWidth = 1;
            newHeight = MathJAI.nextPositivePowerOf2(currentHeight);
        } else if(currentWidth > 1 && currentHeight == 1) {
            newWidth = MathJAI.nextPositivePowerOf2(currentWidth);
            newHeight = 1;
        } else { // Neither dimension equal to unity.
            newWidth = MathJAI.nextPositivePowerOf2(currentWidth);
            newHeight = MathJAI.nextPositivePowerOf2(currentHeight);
        }
        il.setWidth(newWidth);
        il.setHeight(newHeight);


        // Initialize the SampleModel creation flag.
        boolean createNewSampleModel = false;


        // Determine the number of required bands.
        int requiredNumBands = numSourceBands;
        if(isComplexSource && !isComplexDest) {
            requiredNumBands /= 2;
        } else if(!isComplexSource && isComplexDest) {
            requiredNumBands *= 2;
        }


        // Set the number of bands.
        SampleModel sm = il.getSampleModel(source);
        int numBands = sm.getNumBands();
        if(numBands != requiredNumBands) {
            numBands = requiredNumBands;
            createNewSampleModel = true;
        }


        // Force the image to contain floating point data.
        int dataType = sm.getTransferType();
        if(dataType != DataBuffer.TYPE_FLOAT &&
           dataType != DataBuffer.TYPE_DOUBLE) {
            dataType = DataBuffer.TYPE_FLOAT;
            createNewSampleModel = true;
        }

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     */
    public RenderedImage create(ParameterBlock args,
                                RenderingHints hints) {
        // Get the source and its SampleModel.
  RenderedImage source = args.getRenderedSource(0);
        SampleModel sm = source.getSampleModel();


        // Check that the source is single-banded and mediaLib compatible.
        // Ignore the layout because if it doesn't specify a bilevel image
        // then MlibBinarizeOpImage will revise it.
        if (!MediaLibAccessor.isMediaLibCompatible(args) ||
            sm.getNumBands() > 1) {
            return null;
        }


        // Get the threshold value.
        double thresh = args.getDoubleParameter(0);


  // java set all 0's or 1's fast
  if ((thresh > 255|| thresh <=0) && sm.getDataType()== DataBuffer.TYPE_BYTE ||
      (thresh > Short.MAX_VALUE|| thresh <=0) && sm.getDataType()== DataBuffer.TYPE_SHORT||
      (thresh > Integer.MAX_VALUE|| thresh <=0) && sm.getDataType()== DataBuffer.TYPE_INT)
          return null;


        // Get ImageLayout from RenderingHints.
        ImageLayout layout = RIFUtil.getImageLayoutHint(hints);

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            return null;
        }


        /* Check whether dest has data type of float or double. */
        if (layout != null) {
            SampleModel sm = layout.getSampleModel(null);


            if (sm != null) {
                int dtype = sm.getDataType();
                if (dtype == DataBuffer.TYPE_FLOAT ||
                    dtype == DataBuffer.TYPE_DOUBLE) {
                    return null;
                }
            }

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        // resolved by Java2D as to whether the underlying DataBuffer
        // must be of one of the standard types.  Here we make the
        // assumption that it will be -- we can't check without
        // forcing an actual tile to be computed.
        //
        SampleModel sm = source.getSampleModel();
        if ((sm instanceof MultiPixelPackedSampleModel) &&
            (sm.getSampleSize(0) == 1) &&
            (sm.getDataType() == DataBuffer.TYPE_BYTE || 
             sm.getDataType() == DataBuffer.TYPE_USHORT || 
             sm.getDataType() == DataBuffer.TYPE_INT)) {
       
       int srcWidth = source.getWidth();
       int srcHeight= source.getHeight();
       float floatTol = .1F * Math.min(xScale/(srcWidth*xScale+1.0F), yScale/(srcHeight*yScale+1.0F));
       int invScale = (int) Math.round(1.0F/xScale);

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        if ( raster == null ) {
            throw new IllegalArgumentException(JaiI18N.getString("Generic0"));
        }


        SampleModel sampleModel = raster.getSampleModel();


        if (sampleModel.getNumBands() != numBands) {
            throw new IllegalArgumentException(
                JaiI18N.getString("Histogram4"));
        }


        Rectangle bounds = raster.getBounds();

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