/*
 * Copyright 2010-2015 Institut Pasteur.
 * 
 * This file is part of Icy.
 * 
 * Icy is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Icy is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with Icy. If not, see <http://www.gnu.org/licenses/>.
 */
package icy.image.colormodel;

import icy.image.lut.LUT;
import icy.type.DataType;

/**
 * @author stephane
 */
public class ByteColorModel extends IcyColorModel
{
    /**
     * Create a new ByteColorModel
     * 
     * @param numComponents
     *        number of component
     * @param bits
     */
    public ByteColorModel(int numComponents, int[] bits)
    {
        super(numComponents, DataType.BYTE, bits);
    }

    @Override
    public int getRGB(Object pixel)
    {
        final byte[] pix = (byte[]) pixel;
        final int[] scaledData = new int[numComponents];

        for (int comp = 0; comp < numComponents; comp++)
            scaledData[comp] = (int) colormapScalers[comp].scale(pix[comp]);

        return getIcyColorSpace().toRGBUnnorm(scaledData);
    }

    /**
     * Same as getRGB but by using the specified LUT instead of internal one
     * 
     * @see java.awt.image.ColorModel#getRGB(java.lang.Object)
     */
    @Override
    public int getRGB(Object pixel, LUT lut)
    {
        final byte[] pix = (byte[]) pixel;
        final int[] scaledData = new int[numComponents];

        for (int comp = 0; comp < numComponents; comp++)
            scaledData[comp] = (int) lut.getLutChannel(comp).getScaler().scale(pix[comp]);

        return lut.getColorSpace().toRGBUnnorm(scaledData);
    }

    @Override
    public int[] getComponents(Object pixel, int[] components, int offset)
    {
        final int[] result;

        if (components == null)
            result = new int[offset + numComponents];
        else
        {
            if ((components.length - offset) < numComponents)
                throw new IllegalArgumentException("Length of components array < number of components in model");

            result = components;
        }

        final byte data[] = (byte[]) pixel;
        final int len = data.length;

        for (int i = 0; i < len; i++)
            result[offset + i] = data[i];

        return result;
    }

    @Override
    public Object getDataElements(int[] components, int offset, Object obj)
    {
        if ((components.length - offset) < numComponents)
            throw new IllegalArgumentException("Component array too small" + " (should be " + numComponents);

        final byte[] pixel;
        final int len = components.length;

        if (obj == null)
            pixel = new byte[numComponents];
        else
            pixel = (byte[]) obj;

        for (int i = 0; i < len; i++)
            pixel[i] = (byte) components[offset + i];

        return pixel;
    }

    @Override
    public Object getDataElements(float[] normComponents, int offset, Object obj)
    {
        final byte[] pixel;

        if (obj == null)
            pixel = new byte[numComponents];
        else
            pixel = (byte[]) obj;

        for (int c = 0, nc = offset; c < numComponents; c++, nc++)
            pixel[c] = (byte) normalScalers[c].unscale(normComponents[nc]);

        return pixel;
    }

    @Override
    public float[] getNormalizedComponents(Object pixel, float[] normComponents, int normOffset)
    {
        final float[] result;

        if (normComponents == null)
            result = new float[numComponents + normOffset];
        else
            result = normComponents;

        final byte[] data = (byte[]) pixel;

        for (int c = 0, nc = normOffset; c < numComponents; c++, nc++)
            result[nc] = (float) normalScalers[c].scale(data[c]);

        return result;
    }

}