PorterDuffXfermode_Delegate.java revision 51a7e5447de94791c464cda5cc6ebbf616d73c80
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 17package android.graphics; 18 19import com.android.ide.common.rendering.api.LayoutLog; 20import com.android.layoutlib.bridge.Bridge; 21import com.android.layoutlib.bridge.impl.DelegateManager; 22 23import java.awt.AlphaComposite; 24import java.awt.Composite; 25 26/** 27 * Delegate implementing the native methods of android.graphics.PorterDuffXfermode 28 * 29 * Through the layoutlib_create tool, the original native methods of PorterDuffXfermode have been 30 * replaced by calls to methods of the same name in this delegate class. 31 * 32 * This class behaves like the original native implementation, but in Java, keeping previously 33 * native data into its own objects and mapping them to int that are sent back and forth between 34 * it and the original PorterDuffXfermode class. 35 * 36 * Because this extends {@link Xfermode_Delegate}, there's no need to use a 37 * {@link DelegateManager}, as all the PathEffect classes will be added to the manager owned by 38 * {@link Xfermode_Delegate}. 39 * 40 */ 41public class PorterDuffXfermode_Delegate extends Xfermode_Delegate { 42 43 // ---- delegate data ---- 44 45 private final int mMode; 46 47 // ---- Public Helper methods ---- 48 49 public PorterDuff.Mode getMode() { 50 return getPorterDuffMode(mMode); 51 } 52 53 @Override 54 public Composite getComposite(int alpha) { 55 return getComposite(getPorterDuffMode(mMode), alpha); 56 } 57 58 @Override 59 public boolean isSupported() { 60 return true; 61 } 62 63 @Override 64 public String getSupportMessage() { 65 // no message since isSupported returns true; 66 return null; 67 } 68 69 public static PorterDuff.Mode getPorterDuffMode(int mode) { 70 for (PorterDuff.Mode m : PorterDuff.Mode.values()) { 71 if (m.nativeInt == mode) { 72 return m; 73 } 74 } 75 76 Bridge.getLog().error(LayoutLog.TAG_BROKEN, 77 String.format("Unknown PorterDuff.Mode: %d", mode), null /*data*/); 78 assert false; 79 return PorterDuff.Mode.SRC_OVER; 80 } 81 82 public static Composite getComposite(PorterDuff.Mode mode, int alpha) { 83 float falpha = alpha != 0xFF ? (float)alpha / 255.f : 1.f; 84 switch (mode) { 85 case CLEAR: 86 return AlphaComposite.getInstance(AlphaComposite.CLEAR, falpha); 87 case DARKEN: 88 break; 89 case DST: 90 return AlphaComposite.getInstance(AlphaComposite.DST, falpha); 91 case DST_ATOP: 92 return AlphaComposite.getInstance(AlphaComposite.DST_ATOP, falpha); 93 case DST_IN: 94 return AlphaComposite.getInstance(AlphaComposite.DST_IN, falpha); 95 case DST_OUT: 96 return AlphaComposite.getInstance(AlphaComposite.DST_OUT, falpha); 97 case DST_OVER: 98 return AlphaComposite.getInstance(AlphaComposite.DST_OVER, falpha); 99 case LIGHTEN: 100 break; 101 case MULTIPLY: 102 break; 103 case SCREEN: 104 break; 105 case SRC: 106 return AlphaComposite.getInstance(AlphaComposite.SRC, falpha); 107 case SRC_ATOP: 108 return AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, falpha); 109 case SRC_IN: 110 return AlphaComposite.getInstance(AlphaComposite.SRC_IN, falpha); 111 case SRC_OUT: 112 return AlphaComposite.getInstance(AlphaComposite.SRC_OUT, falpha); 113 case SRC_OVER: 114 return AlphaComposite.getInstance(AlphaComposite.SRC_OVER, falpha); 115 case XOR: 116 return AlphaComposite.getInstance(AlphaComposite.XOR, falpha); 117 } 118 119 Bridge.getLog().fidelityWarning(LayoutLog.TAG_BROKEN, 120 String.format("Unsupported PorterDuff Mode: %s", mode.name()), 121 null, null /*data*/); 122 123 return AlphaComposite.getInstance(AlphaComposite.SRC_OVER, falpha); 124 } 125 126 // ---- native methods ---- 127 128 /*package*/ static int nativeCreateXfermode(int mode) { 129 PorterDuffXfermode_Delegate newDelegate = new PorterDuffXfermode_Delegate(mode); 130 return sManager.addDelegate(newDelegate); 131 } 132 133 // ---- Private delegate/helper methods ---- 134 135 private PorterDuffXfermode_Delegate(int mode) { 136 mMode = mode; 137 } 138} 139