/**
*
* Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
**/
package lucee.runtime.img.interpolation;
public class Mitchell implements Interpolation
{
@Override
public double f(double x) {
double b = 0.3333333333333333;
double c = 0.3333333333333333;
if (x < 0.0)
x = -x;
if (x < 1.0) {
x = ((12.0 - 9.0 * b - 6.0 * c) * (x * x * x)
+ (-18.0 + 12.0 * b + 6.0 * c) * x * x + (6.0 - 2.0 * b));
return x / 6.0;
}
if (x < 2.0) {
x = ((-1.0 * b - 6.0 * c) * (x * x * x)
+ (6.0 * b + 30.0 * c) * x * x + (-12.0 * b - 48.0 * c) * x
+ (8.0 * b + 24.0 * c));
return x / 6.0;
}
return 0.0;
}
@Override
public double getSupport() {
return 2.0;
}
}