CodeChickenCore/codechicken/lib/colour/Colour.java

package codechicken.lib.colour;

import codechicken.lib.util.Copyable;
import org.lwjgl.opengl.GL11;

import codechicken.lib.math.MathHelper;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

public abstract class Colour implements Copyable<Colour>
{
    public byte r;
    public byte g;
    public byte b;
    public byte a;

    public Colour(int r, int g, int b, int a)
    {
        this.r = (byte) r;
        this.g = (byte) g;
        this.b = (byte) b;
        this.a = (byte) a;
    }

    public Colour(Colour colour)
    {
        r = colour.r;
        g = colour.g;
        b = colour.b;
        a = colour.a;
    }

    @SideOnly(Side.CLIENT)
    public void glColour()
    {
        GL11.glColor4ub(r, g, b, a);
    }

    @SideOnly(Side.CLIENT)
    public void glColour(int a)
    {
        GL11.glColor4ub(r, g, b, (byte) a);
    }
    
    public abstract int pack();

    @Override
    public String toString()
    {
        return getClass().getSimpleName() + "[0x" + Integer.toHexString(pack()).toUpperCase() + "]";
    }

    public Colour add(Colour colour2)
    {
        a += colour2.a;
        r += colour2.r;
        g += colour2.g;
        b += colour2.b;
        return this;
    }

    public Colour sub(Colour colour2)
    {
        int ia = (a & 0xFF) - (colour2.a & 0xFF);
        int ir = (r & 0xFF) - (colour2.r & 0xFF);
        int ig = (g & 0xFF) - (colour2.g & 0xFF);
        int ib = (b & 0xFF) - (colour2.b & 0xFF);
        a = (byte) (ia < 0 ? 0 : ia);
        r = (byte) (ir < 0 ? 0 : ir);
        g = (byte) (ig < 0 ? 0 : ig);
        b = (byte) (ib < 0 ? 0 : ib);
        return this;
    }

    public Colour invert()
    {
        a = (byte) (0xFF - (a & 0xFF));
        r = (byte) (0xFF - (r & 0xFF));
        g = (byte) (0xFF - (g & 0xFF));
        b = (byte) (0xFF - (b & 0xFF));
        return this;
    }

    public Colour multiply(Colour colour2)
    {
        a = (byte) ((a & 0xFF) * ((colour2.a & 0xFF) / 255D));
        r = (byte) ((r & 0xFF) * ((colour2.r & 0xFF) / 255D));
        g = (byte) ((g & 0xFF) * ((colour2.g & 0xFF) / 255D));
        b = (byte) ((b & 0xFF) * ((colour2.b & 0xFF) / 255D));
        return this;
    }

    public Colour scale(double d)
    {
        a = (byte) ((a & 0xFF) * d);
        r = (byte) ((r & 0xFF) * d);
        g = (byte) ((g & 0xFF) * d);
        b = (byte) ((b & 0xFF) * d);
        return this;
    }

    public Colour interpolate(Colour colour2, double d)
    {
        return this.add(colour2.copy().sub(this).scale(d));
    }

    public Colour multiplyC(double d)
    {
        r = (byte) MathHelper.clip((r & 0xFF) * d, 0, 255);
        g = (byte) MathHelper.clip((g & 0xFF) * d, 0, 255);
        b = (byte) MathHelper.clip((b & 0xFF) * d, 0, 255);

        return this;
    }

    public abstract Colour copy();

    public int rgb()
    {
        return (r & 0xFF) << 16 | (g & 0xFF) << 8 | (b & 0xFF);
    }

    public int argb()
    {
        return (a & 0xFF) << 24 | (r & 0xFF) << 16 | (g & 0xFF) << 8 | (b & 0xFF);
    }

    public int rgba()
    {
        return (r & 0xFF) << 24 | (g & 0xFF) << 16 | (b & 0xFF) << 8 | (a & 0xFF);
    }

    public Colour set(Colour colour)
    {
        r = colour.r;
        g = colour.g;
        b = colour.b;
        a = colour.a;
        return this;
    }

    public boolean equals(Colour colour)
    {
        return colour != null && rgba() == colour.rgba();
    }
}