package ch.werner_randelshofer.gui.image;
import java.awt.image.DirectColorModel;

public class HAMColorModel extends java.awt.image.DirectColorModel
{
	//insert class definition here
	public final static int
		HAM6 = 6,
		HAM8 = 8;
			
	protected int HAMType;
	protected int map_size;
	protected boolean opaque;
	protected int[] rgb;
	
	public HAMColorModel(int aHAMType,int size,byte r[],byte g[],byte b[]) {
		super(24,0x00ff0000,0x0000ff00,0x000000ff);
		if (aHAMType != HAM6 && aHAMType != HAM8) {
			throw new IllegalArgumentException("Unknown HAM Type: " + aHAMType);
		}
		HAMType = aHAMType;
		setRGBs(size,r,g,b,null);
	}
	public int getHAMType() {
		return HAMType;
	}
	
	protected void setRGBs(int size, byte r[], byte g[], byte b[], byte a[]) {
	if (size > 256) {
	    throw new ArrayIndexOutOfBoundsException();
	}
	map_size = size;
	rgb = new int[256];
	int alpha = 0xff;
	opaque = true;
	for (int i = 0; i < size; i++) {
	    if (a != null) {
		alpha = (a[i] & 0xff);
		if (alpha != 0xff) {
		    opaque = false;
		}
	    }
	    rgb[i] = (alpha << 24)
		| ((r[i] & 0xff) << 16)
		| ((g[i] & 0xff) << 8)
		| (b[i] & 0xff);
	}
    }

    /**
     * Copies the array of red color components into the given array.  Only
     * the initial entries of the array as specified by getMapSize() are
     * written.
     */
    final public void getReds(byte r[]) {
	for (int i = 0; i < map_size; i++) {
	    r[i] = (byte) (rgb[i] >> 16);
	}
    }

    /**
     * Copies the array of green color components into the given array.  Only
     * the initial entries of the array as specified by getMapSize() are
     *  written.
     */
    final public void getGreens(byte g[]) {
	for (int i = 0; i < map_size; i++) {
	    g[i] = (byte) (rgb[i] >> 8);
	}
    }

    /**
     * Copies the array of blue color components into the given array.  Only
     * the initial entries of the array as specified by getMapSize() will
     * be written.
     */
    final public void getBlues(byte b[]) {
	for (int i = 0; i < map_size; i++) {
	    b[i] = (byte) rgb[i];
	}
    }
    /**
     * Copies the array of color components into the given array.  Only
     * the initial entries of the array as specified by getMapSize() will
     * be written.
     */
    final public void getRGBs(int rgbs[]) {
	for (int i = 0; i < map_size; i++) {
	    rgbs[i] = rgb[i];
	}
    }
    /**
     * Returns the size of the color component arrays in this IndexColorModel.
     */
    final public int getMapSize() {
	return map_size;
    }
}