/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.graphics;

public class PorterDuff {

	// these value must match their native equivalents. See SkPorterDuff.h
	public enum Mode {
		/**
		 * [0, 0]
		 */
		CLEAR(0),
		/**
		 * [Sa, Sc]
		 */
		SRC(1),
		/**
		 * [Da, Dc]
		 */
		DST(2),
		/**
		 * [Sa + (1 - Sa)*Da, Rc = Sc + (1 - Sa)*Dc]
		 */
		SRC_OVER(3),
		/**
		 * [Sa + (1 - Sa)*Da, Rc = Dc + (1 - Da)*Sc]
		 */
		DST_OVER(4),
		/**
		 * [Sa * Da, Sc * Da]
		 */
		SRC_IN(5),
		/**
		 * [Sa * Da, Sa * Dc]
		 */
		DST_IN(6),
		/**
		 * [Sa * (1 - Da), Sc * (1 - Da)]
		 */
		SRC_OUT(7),
		/**
		 * [Da * (1 - Sa), Dc * (1 - Sa)]
		 */
		DST_OUT(8),
		/**
		 * [Da, Sc * Da + (1 - Sa) * Dc]
		 */
		SRC_ATOP(9),
		/**
		 * [Sa, Sa * Dc + Sc * (1 - Da)]
		 */
		DST_ATOP(10),
		/**
		 * [Sa + Da - 2 * Sa * Da, Sc * (1 - Da) + (1 - Sa) * Dc]
		 */
		XOR(11),
		/**
		   [Sa + Da - Sa*Da,
		     Sc*(1 - Da) + Dc*(1 - Sa) + min(Sc, Dc)]
		 */
		DARKEN(12),
		/**
		   [Sa + Da - Sa*Da,
		     Sc*(1 - Da) + Dc*(1 - Sa) + max(Sc, Dc)]
		 */
		LIGHTEN(13),
		/**
		 * [Sa * Da, Sc * Dc]
		 */
		MULTIPLY(14),
		/**
		 * [Sa + Da - Sa * Da, Sc + Dc - Sc * Dc]
		 */
		SCREEN(15),
		/**
		 * Saturate(S + D)
		 */
		ADD(16),
		OVERLAY(17);

		public int nativeInt;

		Mode(int nativeInt) {
			this.nativeInt = nativeInt;
		}
	}
}