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

        int tileHeight = bounds.height;


        // Retrieve layout information from the hints. The tile size hints
        // are ignored if a SampleModel hint is supplied. Set the hints
        // observed if any hints are used.
        SampleModel sm = null;
        ColorModel cm = null;
        RenderingHints hintsObserved = null;
        if(hints != null) {
            // Get the ImageLayout.
            ImageLayout layout = (ImageLayout)hints.get(JAI.KEY_IMAGE_LAYOUT);


            if(layout != null) {
                // Initialize the observed hint variables.
                hintsObserved = new RenderingHints(null);
                ImageLayout layoutObserved = new ImageLayout();


                // Get the SampleModel.
                if(layout.isValid(ImageLayout.SAMPLE_MODEL_MASK)) {
                    sm = layout.getSampleModel(null);
                    if(sm.getWidth() != tileWidth ||
                       sm.getHeight() != tileHeight) {
                        sm = sm.createCompatibleSampleModel(tileWidth,
                                                            tileHeight);
                    }
                    if(layoutObserved != null) {
                        layoutObserved.setSampleModel(sm);
                    }
                }


                // Get the ColorModel.
                if(layout.isValid(ImageLayout.COLOR_MODEL_MASK)) {
                    cm = layout.getColorModel(null);
                    if(layoutObserved != null) {
                        layoutObserved.setColorModel(cm);
                    }
                }


                // Get the tile dimensions.
                if(layout.isValid(ImageLayout.TILE_WIDTH_MASK)) {
                    tileWidth = layout.getTileWidth(null);
                    if(layoutObserved != null) {
                        layoutObserved.setTileWidth(tileWidth);
                    }
                } else if(sm != null) {
                    tileWidth = sm.getWidth();
                }
                if(layout.isValid(ImageLayout.TILE_HEIGHT_MASK)) {
                    tileHeight = layout.getTileHeight(null);
                    if(layoutObserved != null) {
                        layoutObserved.setTileHeight(tileHeight);
                    }
                } else if(sm != null) {
                    tileHeight = sm.getHeight();
                }


                // Set the observed hints layout.
                hintsObserved.put(JAI.KEY_IMAGE_LAYOUT, layoutObserved);
            } // layout != null
        } // hints != null


        // Ensure that the SampleModel is compatible with the tile size.
        if(sm != null &&
           (sm.getWidth() != tileWidth || sm.getHeight() != tileHeight)) {
            sm = sm.createCompatibleSampleModel(tileWidth, tileHeight);
        }


        // Attempt to derive compatible SampleModel/ColorModel combination.
        if(cm != null && (sm == null ||
                          !JDKWorkarounds.areCompatibleDataModels(sm, cm))) {

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      source.getTileWidth() >= 32768 || 
      source.getTileHeight() >= 32768) {
            return null;
        }


        SampleModel sm = source.getSampleModel();
        boolean isBilevel = (sm instanceof MultiPixelPackedSampleModel) &&
            (sm.getSampleSize(0) == 1) &&
            (sm.getDataType() == DataBuffer.TYPE_BYTE || 
             sm.getDataType() == DataBuffer.TYPE_USHORT || 
             sm.getDataType() == DataBuffer.TYPE_INT);
        if (isBilevel) {
            // Let Java code handle it, reformatting is slower
            return null;
        }

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    /** The Y translation. */
    protected float yTrans;


    private static SampleModel sampleModelHelper(int numBands,
                                                 ImageLayout layout) {
        SampleModel sampleModel;
        if (layout!= null && layout.isValid(ImageLayout.SAMPLE_MODEL_MASK)) {
            sampleModel = layout.getSampleModel(null);


            if (sampleModel.getNumBands() != numBands) {
                throw new RuntimeException(JaiI18N.getString("ImageFunctionRIF0"));
            }
        } else { // Create a SampleModel.
            // Use a dummy width and height, OpImage will fix them
            sampleModel = RasterFactory.createBandedSampleModel(

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                                            int[] bandIndices) {
        ImageLayout il = layout == null ?
            new ImageLayout() : (ImageLayout)layout.clone();


        // Create a sub-banded SampleModel.
        SampleModel sourceSM = source.getSampleModel();
        int numBands = bandIndices.length;


        // The only ColorModel compatible with a SinglePixelPackedSampleModel
        // in the J2SE is a DirectColorModel which is by definition of
        // ColorSpace.TYPE_RGB. Therefore if there are fewer than 3 bands
        // a data copy is obligatory if a ColorModel will be possible.
        SampleModel sm = null;
        if(sourceSM instanceof SinglePixelPackedSampleModel && numBands < 3) {
            sm = new PixelInterleavedSampleModel(
                     DataBuffer.TYPE_BYTE,
                     sourceSM.getWidth(), sourceSM.getHeight(),
                     numBands, sourceSM.getWidth()*numBands,

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        boolean premultiplied =
            ((Boolean)args.getObjectParameter(2)).booleanValue();
        EnumeratedParameter destAlpha =
            (EnumeratedParameter)args.getObjectParameter(3);


        SampleModel sm = alpha1.getSampleModel();


        if (!(sm instanceof ComponentSampleModel) ||
            sm.getNumBands() != 1 ||
            !(alpha1.getColorModel() instanceof ComponentColorModel) ||
            alpha2 != null ||
            premultiplied ||
            !(destAlpha.equals(CompositeDescriptor.NO_DESTINATION_ALPHA))) {
            return null;

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        sampleModelState = (SerializableState)in.readObject();
        dataBufferState = (SerializableState)in.readObject();
        location = (Point)in.readObject();


        // Restore the SampleModel from its serialized form.
        SampleModel sampleModel = (SampleModel)sampleModelState.getObject();
        if (sampleModel == null) {
            theObject = null;
            return;
        }

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        if(colorModel == null) {
            // Try to guess an appropriate ColorModel.
            if(colorModel == null) {
                // First try to deduce one from the TiledImage SampleModel.
                SampleModel sm = ti.getSampleModel();
                colorModel = PlanarImage.createColorModel(sm);
                if(colorModel == null) {
                    // ColorModel still null: try RGB default model.
                    ColorModel cm = ColorModel.getRGBdefault();
                    if(JDKWorkarounds.areCompatibleDataModels(sm, cm)) {

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      * Serialize the <code>SampleModelState</code>.
      *
      * @param out The <code>ObjectOutputStream</code>.
      */
    private void writeObject(ObjectOutputStream out) throws IOException {
        SampleModel sampleModel = (SampleModel)theObject;
        if(sampleModel instanceof ComponentSampleModel) {
            ComponentSampleModel sm = (ComponentSampleModel)sampleModel;
            int sampleModelType = TYPE_COMPONENT;
            int transferType = sm.getTransferType();
            if(sampleModel instanceof PixelInterleavedSampleModel) {

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      *
      * @param out The <code>ObjectInputStream</code>.
      */
    private void readObject(ObjectInputStream in)
        throws IOException, ClassNotFoundException {
        SampleModel sampleModel = null;
        int sampleModelType = (int)in.readInt();
        switch(sampleModelType) {
        case TYPE_PIXEL_INTERLEAVED:
            sampleModel =
                RasterFactory.createPixelInterleavedSampleModel(in.readInt(),

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        sampleModelState = (SerializableState)in.readObject();
        dataBufferState = (SerializableState)in.readObject();
        location = (Point)in.readObject();


        // Restore the SampleModel from its serialized form.
        SampleModel sampleModel = (SampleModel)sampleModelState.getObject();
        if(sampleModel == null) {
            raster = null;
            return;
        }

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