/*
* Copyright (C) 2015 Federico Iosue (federico.iosue@gmail.com)
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package it.feio.android.omninotes.utils;
import android.graphics.Color;
public class ColorsUtil {
public static final int COLOR_DARK = 0;
public static final int COLOR_LIGHT = 1;
private static double CONTRAST_THRESHOLD = 100;
public static double calculateColorLuminance(int color) {
return 0.2126 * Color.red(color) + 0.7152 * Color.green(color) + 0.0722 * Color.blue(color);
}
public static int getContrastedColor(int color) {
double luminance = calculateColorLuminance(color);
return luminance > CONTRAST_THRESHOLD ? COLOR_DARK : COLOR_LIGHT;
}
}