1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.graphics; 18 19 /** 20 * AvoidXfermode xfermode will draw the src everywhere except on top of the 21 * opColor or, depending on the Mode, draw only on top of the opColor. 22 */ 23 public class AvoidXfermode extends Xfermode { 24 25 // these need to match the enum in SkAvoidXfermode.h on the native side 26 public enum Mode { 27 AVOID (0), //!< draw everywhere except on the opColor 28 TARGET (1); //!< draw only on top of the opColor 29 Mode(int nativeInt)30 Mode(int nativeInt) { 31 this.nativeInt = nativeInt; 32 } 33 final int nativeInt; 34 } 35 36 /** 37 * This xfermode will draw the src everywhere except on top of the opColor 38 * or, depending on the Mode, draw only on top of the opColor. 39 * 40 * @param opColor The color to avoid (or to target depending on Mode). Note 41 * that the alpha in opColor is ignored. 42 * @param tolerance How closely we compare a pixel to the opColor. 43 * 0 - only operate if exact match 44 * 255 - maximum gradation (blending) based on how 45 * similar the pixel is to our opColor (max tolerance) 46 * @param mode If we should avoid or target the opColor 47 */ AvoidXfermode(int opColor, int tolerance, Mode mode)48 public AvoidXfermode(int opColor, int tolerance, Mode mode) { 49 if (tolerance < 0 || tolerance > 255) { 50 throw new IllegalArgumentException("tolerance must be 0..255"); 51 } 52 native_instance = nativeCreate(opColor, tolerance, mode.nativeInt); 53 } 54 nativeCreate(int opColor, int tolerance, int nativeMode)55 private static native int nativeCreate(int opColor, int tolerance, 56 int nativeMode); 57 } 58