1 /* 2 * Copyright (C) 2010 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 import com.android.layoutlib.bridge.impl.DelegateManager; 20 import com.android.layoutlib.bridge.impl.PorterDuffUtility; 21 import com.android.tools.layoutlib.annotations.LayoutlibDelegate; 22 23 import android.graphics.PorterDuff.Mode; 24 25 import java.awt.Composite; 26 27 import static com.android.layoutlib.bridge.impl.PorterDuffUtility.getPorterDuffMode; 28 29 /** 30 * Delegate implementing the native methods of android.graphics.PorterDuffXfermode 31 * 32 * Through the layoutlib_create tool, the original native methods of PorterDuffXfermode have been 33 * replaced by calls to methods of the same name in this delegate class. 34 * 35 * This class behaves like the original native implementation, but in Java, keeping previously 36 * native data into its own objects and mapping them to int that are sent back and forth between 37 * it and the original PorterDuffXfermode class. 38 * 39 * Because this extends {@link Xfermode_Delegate}, there's no need to use a 40 * {@link DelegateManager}, as all the PathEffect classes will be added to the manager owned by 41 * {@link Xfermode_Delegate}. 42 * 43 */ 44 public class PorterDuffXfermode_Delegate extends Xfermode_Delegate { 45 46 // ---- delegate data ---- 47 48 private final Mode mMode; 49 50 // ---- Public Helper methods ---- 51 52 public Mode getMode() { 53 return mMode; 54 } 55 56 @Override 57 public Composite getComposite(int alpha) { 58 return PorterDuffUtility.getComposite(mMode, alpha); 59 } 60 61 @Override 62 public boolean isSupported() { 63 return true; 64 } 65 66 @Override 67 public String getSupportMessage() { 68 // no message since isSupported returns true; 69 return null; 70 } 71 72 73 // ---- native methods ---- 74 75 @LayoutlibDelegate 76 /*package*/ static long nativeCreateXfermode(int mode) { 77 PorterDuffXfermode_Delegate newDelegate = new PorterDuffXfermode_Delegate(mode); 78 return sManager.addNewDelegate(newDelegate); 79 } 80 81 // ---- Private delegate/helper methods ---- 82 83 private PorterDuffXfermode_Delegate(int mode) { 84 mMode = getPorterDuffMode(mode); 85 } 86 87 } 88
