colormodel.java

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     * An <code>IllegalArgumentException</code> is thrown if pixel
     * values for this <code>ColorModel</code> are not conveniently
     * representable as a single int.
     * @param pixel the specified pixel
     * @return the value of alpha component of the specified pixel. 
     */
    public abstract int getAlpha(int pixel);

    /**
     * Returns the color/alpha components of the pixel in the default
     * RGB color model format.  A color conversion is done if necessary.
     * The pixel value is specified as an int.
     * An <code>IllegalArgumentException</code> thrown if pixel values
     * for this <code>ColorModel</code> are not conveniently representable
     * as a single int.  The returned value is in a non
     * pre-multiplied format. For example, if the alpha is premultiplied,
     * this method divides it out of the color components.  If the alpha
     * value is 0, the color values are 0.
     * @param pixel the specified pixel
     * @return the RGB value of the color/alpha components of the 
     *		specified pixel.
     * @see ColorModel#getRGBdefault
     */
    public int getRGB(int pixel) {
	return (getAlpha(pixel) << 24)
	    | (getRed(pixel) << 16)
	    | (getGreen(pixel) << 8)
	    | (getBlue(pixel) << 0);
    }

    /**
     * Returns the red color component for the specified pixel, scaled
     * from 0 to 255 in the default RGB <code>ColorSpace</code>, sRGB.  A
     * color conversion is done if necessary.  The pixel value is
     * specified by an array of data elements of type transferType passed
     * in as an object reference.  The returned value is a non
     * pre-multiplied value.  For example, if alpha is premultiplied,
     * this method divides it out before returning
     * the value.  If the alpha value is 0, the red value is 0.
     * If <code>inData</code> is not a primitive array of type
     * transferType, a <code>ClassCastException</code> is thrown.  An
     * <code>ArrayIndexOutOfBoundsException</code> is thrown if 
     * <code>inData</code> is not large enough to hold a pixel value for
     * this <code>ColorModel</code>.
     * If this <code>transferType</code> is not supported, a       
     * <code>UnsupportedOperationException</code> will be
     * thrown.  Since
     * <code>ColorModel</code> is an abstract class, any instance
     * must be an instance of a subclass.  Subclasses inherit the
     * implementation of this method and if they don't override it, this
     * method throws an exception if the subclass uses a
     * <code>transferType</code> other than
     * <code>DataBuffer.TYPE_BYTE</code>,
     * <code>DataBuffer.TYPE_USHORT</code>, or 
     * <code>DataBuffer.TYPE_INT</code>. 
     * @param inData an array of pixel values
     * @return the value of the red component of the specified pixel.
     * @throws ClassCastException if <code>inData</code>
     * 	is not a primitive array of type <code>transferType</code>
     * @throws ArrayIndexOutOfBoundsException if
     *	<code>inData</code> is not large enough to hold a pixel value
     *	for this <code>ColorModel</code>
     * @throws UnsupportedOperationException if this
     *	<code>tranferType</code> is not supported by this
     *	<code>ColorModel</code>
     */
    public int getRed(Object inData) {
        int pixel=0,length=0;
        switch (transferType) {
            case DataBuffer.TYPE_BYTE:
               byte bdata[] = (byte[])inData;
               pixel = bdata[0] & 0xff;
               length = bdata.length;
            break;
            case DataBuffer.TYPE_USHORT:
               short sdata[] = (short[])inData;
               pixel = sdata[0] & 0xffff;
               length = sdata.length;
            break;
            case DataBuffer.TYPE_INT:
               int idata[] = (int[])inData;
               pixel = idata[0];
               length = idata.length;
            break;
            default:
               throw new UnsupportedOperationException("This method has not been "+
                   "implemented for transferType " + transferType);
        }
        if (length == 1) {
            return getRed(pixel);
        }
        else {
            throw new UnsupportedOperationException
                ("This method is not supported by this color model");
        }
    }

    /**
     * Returns the green color component for the specified pixel, scaled
     * from 0 to 255 in the default RGB <code>ColorSpace</code>, sRGB.  A
     * color conversion is done if necessary.  The pixel value is
     * specified by an array of data elements of type transferType passed
     * in as an object reference.  The returned value will be a non
     * pre-multiplied value.  For example, if the alpha is premultiplied,
     * this method divides it out before returning the value.  If the
     * alpha value is 0, the green value is 0.  If <code>inData</code> is
     * not a primitive array of type transferType, a
     * <code>ClassCastException</code> is thrown.  An
     * <code>ArrayIndexOutOfBoundsException</code> is thrown if 
     * <code>inData</code> is not large enough to hold a pixel value for
     * this <code>ColorModel</code>.
     * If this <code>transferType</code> is not supported, a
     * <code>UnsupportedOperationException</code> will be
     * thrown.  Since
     * <code>ColorModel</code> is an abstract class, any instance
     * must be an instance of a subclass.  Subclasses inherit the
     * implementation of this method and if they don't override it, this
     * method throws an exception if the subclass uses a
     * <code>transferType</code> other than 
     * <code>DataBuffer.TYPE_BYTE</code>, 
     * <code>DataBuffer.TYPE_USHORT</code>, or  
     * <code>DataBuffer.TYPE_INT</code>.
     * @param inData an array of pixel values
     * @return the value of the green component of the specified pixel.
     * @throws <code>ClassCastException</code> if <code>inData</code>
     *  is not a primitive array of type <code>transferType</code>
     * @throws <code>ArrayIndexOutOfBoundsException</code> if
     *  <code>inData</code> is not large enough to hold a pixel value
     *  for this <code>ColorModel</code>
     * @throws <code>UnsupportedOperationException</code> if this
     *  <code>tranferType</code> is not supported by this 
     *  <code>ColorModel</code> 
     */
    public int getGreen(Object inData) {
        int pixel=0,length=0;
        switch (transferType) {
            case DataBuffer.TYPE_BYTE:
               byte bdata[] = (byte[])inData;
               pixel = bdata[0] & 0xff;
               length = bdata.length;
            break;
            case DataBuffer.TYPE_USHORT:
               short sdata[] = (short[])inData;
               pixel = sdata[0] & 0xffff;
               length = sdata.length;
            break;
            case DataBuffer.TYPE_INT:
               int idata[] = (int[])inData;
               pixel = idata[0];
               length = idata.length;
            break;
            default:
               throw new UnsupportedOperationException("This method has not been "+
                   "implemented for transferType " + transferType);
        }
        if (length == 1) {
            return getGreen(pixel);
        }
        else {
            throw new UnsupportedOperationException
                ("This method is not supported by this color model");
        }
    }
    
    /**
     * Returns the blue color component for the specified pixel, scaled
     * from 0 to 255 in the default RGB <code>ColorSpace</code>, sRGB.  A
     * color conversion is done if necessary.  The pixel value is
     * specified by an array of data elements of type transferType passed
     * in as an object reference.  The returned value is a non
     * pre-multiplied value.  For example, if the alpha is premultiplied,
     * this method divides it out before returning the value.  If the
     * alpha value is 0, the blue value will be 0.  If 
     * <code>inData</code> is not a primitive array of type transferType,
     * a <code>ClassCastException</code> is thrown.  An
     * <code>ArrayIndexOutOfBoundsException</code> is
     * thrown if <code>inData</code> is not large enough to hold a pixel
     * value for this <code>ColorModel</code>.
     * If this <code>transferType</code> is not supported, a
     * <code>UnsupportedOperationException</code> will be 
     * thrown.  Since
     * <code>ColorModel</code> is an abstract class, any instance
     * must be an instance of a subclass.  Subclasses inherit the
     * implementation of this method and if they don't override it, this
     * method throws an exception if the subclass uses a
     * <code>transferType</code> other than 
     * <code>DataBuffer.TYPE_BYTE</code>, 
     * <code>DataBuffer.TYPE_USHORT</code>, or  
     * <code>DataBuffer.TYPE_INT</code>.
     * @param inData an array of pixel values
     * @return the value of the blue component of the specified pixel.
     * @throws ClassCastException if <code>inData</code>
     *  is not a primitive array of type <code>transferType</code>
     * @throws ArrayIndexOutOfBoundsException if
     *  <code>inData</code> is not large enough to hold a pixel value
     *  for this <code>ColorModel</code>
     * @throws UnsupportedOperationException if this
     *  <code>tranferType</code> is not supported by this 
     *  <code>ColorModel</code> 
     */
    public int getBlue(Object inData) {
        int pixel=0,length=0;
        switch (transferType) {
            case DataBuffer.TYPE_BYTE:
               byte bdata[] = (byte[])inData;
               pixel = bdata[0] & 0xff;
               length = bdata.length;
            break;
            case DataBuffer.TYPE_USHORT:
               short sdata[] = (short[])inData;
               pixel = sdata[0] & 0xffff;
               length = sdata.length;
            break;
            case DataBuffer.TYPE_INT:
               int idata[] = (int[])inData;
               pixel = idata[0];
               length = idata.length;
            break;
            default:
               throw new UnsupportedOperationException("This method has not been "+
                   "implemented for transferType " + transferType);
        }
        if (length == 1) {
            return getBlue(pixel);
        }
        else {
            throw new UnsupportedOperationException
                ("This method is not supported by this color model");
        }
    }

    /**
     * Returns the alpha component for the specified pixel, scaled
     * from 0 to 255.  The pixel value is specified by an array of data
     * elements of type transferType passed in as an object reference.
     * If inData is not a primitive array of type transferType, a
     * <code>ClassCastException</code> is thrown.  An
     * <code>ArrayIndexOutOfBoundsException</code> is thrown if 
     * <code>inData</code> is not large enough to hold a pixel value for
     * this <code>ColorModel</code>.
     * If this <code>transferType</code> is not supported, a
     * <code>UnsupportedOperationException</code> will be 
     * thrown.  Since
     * <code>ColorModel</code> is an abstract class, any instance
     * must be an instance of a subclass.  Subclasses inherit the
     * implementation of this method and if they don't override it, this
     * method throws an exception if the subclass uses a
     * <code>transferType</code> other than 
     * <code>DataBuffer.TYPE_BYTE</code>, 
     * <code>DataBuffer.TYPE_USHORT</code>, or  
     * <code>DataBuffer.TYPE_INT</code>.
     * @param inData the specified pixel
     * @return the alpha component of the specified pixel, scaled from
     * 0 to 255.
     * @throws ClassCastException if <code>inData</code> 
     *  is not a primitive array of type <code>transferType</code>
     * @throws ArrayIndexOutOfBoundsException if
     *  <code>inData</code> is not large enough to hold a pixel value   
     *  for this <code>ColorModel</code>
     * @throws UnsupportedOperationException if this
     *  <code>tranferType</code> is not supported by this
     *  <code>ColorModel</code>
     */
    public int getAlpha(Object inData) {
        int pixel=0,length=0;
        switch (transferType) {
            case DataBuffer.TYPE_BYTE:
               byte bdata[] = (byte[])inData;
               pixel = bdata[0] & 0xff;
               length = bdata.length;
            break;
            case DataBuffer.TYPE_USHORT:
               short sdata[] = (short[])inData;