/*
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*/
package org.pepsoft.util;
/**
*
* @author pepijn
*/
public final class ColourUtils {
private ColourUtils() {
// Prevent instantiation
}
public static int mix(int colour1, int colour2) {
final int red = ((colour1 & 0xFF0000) >> 17) + ((colour2 & 0xFF0000) >> 17);
final int green = ((colour1 & 0x00FF00) >> 9) + ((colour2 & 0x00FF00) >> 9);
final int blue = ((colour1 & 0x0000FF) >> 1) + ((colour2 & 0x0000FF) >> 1);
return (red << 16) | (green << 8) | blue;
}
public static int mix(int colour1, int colour2, int alpha) {
final int red1 = (colour1 & 0xFF0000) >> 16;
final int green1 = (colour1 & 0x00FF00) >> 8;
final int blue1 = colour1 & 0x0000FF;
final int red2 = (colour2 & 0xFF0000) >> 16;
final int green2 = (colour2 & 0x00FF00) >> 8;
final int blue2 = colour2 & 0x0000FF;
final int red = (red1 * alpha + red2 * (255 - alpha)) / 255;
final int green = (green1 * alpha + green2 * (255 - alpha)) / 255;
final int blue = (blue1 * alpha + blue2 * (255 - alpha)) / 255;
return (red << 16) | (green << 8) | blue;
}
/**
* Multiplies each of component of <code>colour</code> with
* <code>amount</code> and divides the result by 256.
*
* @param colour The RGB colour to multiply.
* @param amount The amount to multiply each colour band with, where 256
* leaves the colour unchanged.
* @return The multiplied colour.
*/
public static int multiply(int colour, int amount) {
if (amount == 256) {
return colour;
}
int red = (colour & 0xFF0000) >> 16;
int green = (colour & 0x00FF00) >> 8;
int blue = colour & 0x0000FF;
red = red * amount;
if (red > 65535) {
red = 65535;
}
green = green * amount;
if (green > 65535) {
green = 65535;
}
blue = blue * amount;
if (blue > 65535) {
blue = 65535;
}
return ((red << 8) & 0xFF0000) | (green & 0x00FF00) | ((blue >> 8) & 0x0000FF);
}
}