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      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.ide.common.rendering.api.LayoutLog;
     20 import com.android.layoutlib.bridge.Bridge;
     21 import com.android.layoutlib.bridge.impl.DelegateManager;
     22 import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
     23 
     24 import java.awt.AlphaComposite;
     25 import java.awt.Composite;
     26 
     27 /**
     28  * Delegate implementing the native methods of android.graphics.PorterDuffXfermode
     29  *
     30  * Through the layoutlib_create tool, the original native methods of PorterDuffXfermode have been
     31  * replaced by calls to methods of the same name in this delegate class.
     32  *
     33  * This class behaves like the original native implementation, but in Java, keeping previously
     34  * native data into its own objects and mapping them to int that are sent back and forth between
     35  * it and the original PorterDuffXfermode class.
     36  *
     37  * Because this extends {@link Xfermode_Delegate}, there's no need to use a
     38  * {@link DelegateManager}, as all the PathEffect classes will be added to the manager owned by
     39  * {@link Xfermode_Delegate}.
     40  *
     41  */
     42 public class PorterDuffXfermode_Delegate extends Xfermode_Delegate {
     43 
     44     // ---- delegate data ----
     45 
     46     private final int mMode;
     47 
     48     // ---- Public Helper methods ----
     49 
     50     public PorterDuff.Mode getMode() {
     51         return getPorterDuffMode(mMode);
     52     }
     53 
     54     @Override
     55     public Composite getComposite(int alpha) {
     56         return getComposite(getPorterDuffMode(mMode), alpha);
     57     }
     58 
     59     @Override
     60     public boolean isSupported() {
     61         return true;
     62     }
     63 
     64     @Override
     65     public String getSupportMessage() {
     66         // no message since isSupported returns true;
     67         return null;
     68     }
     69 
     70     public static PorterDuff.Mode getPorterDuffMode(int mode) {
     71         for (PorterDuff.Mode m : PorterDuff.Mode.values()) {
     72             if (m.nativeInt == mode) {
     73                 return m;
     74             }
     75         }
     76 
     77         Bridge.getLog().error(LayoutLog.TAG_BROKEN,
     78                 String.format("Unknown PorterDuff.Mode: %d", mode), null /*data*/);
     79         assert false;
     80         return PorterDuff.Mode.SRC_OVER;
     81     }
     82 
     83     public static Composite getComposite(PorterDuff.Mode mode, int alpha) {
     84         float falpha = alpha != 0xFF ? (float)alpha / 255.f : 1.f;
     85         switch (mode) {
     86             case CLEAR:
     87                 return AlphaComposite.getInstance(AlphaComposite.CLEAR, falpha);
     88             case DARKEN:
     89                 break;
     90             case DST:
     91                 return AlphaComposite.getInstance(AlphaComposite.DST, falpha);
     92             case DST_ATOP:
     93                 return AlphaComposite.getInstance(AlphaComposite.DST_ATOP, falpha);
     94             case DST_IN:
     95                 return AlphaComposite.getInstance(AlphaComposite.DST_IN, falpha);
     96             case DST_OUT:
     97                 return AlphaComposite.getInstance(AlphaComposite.DST_OUT, falpha);
     98             case DST_OVER:
     99                 return AlphaComposite.getInstance(AlphaComposite.DST_OVER, falpha);
    100             case LIGHTEN:
    101                 break;
    102             case MULTIPLY:
    103                 break;
    104             case SCREEN:
    105                 break;
    106             case SRC:
    107                 return AlphaComposite.getInstance(AlphaComposite.SRC, falpha);
    108             case SRC_ATOP:
    109                 return AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, falpha);
    110             case SRC_IN:
    111                 return AlphaComposite.getInstance(AlphaComposite.SRC_IN, falpha);
    112             case SRC_OUT:
    113                 return AlphaComposite.getInstance(AlphaComposite.SRC_OUT, falpha);
    114             case SRC_OVER:
    115                 return AlphaComposite.getInstance(AlphaComposite.SRC_OVER, falpha);
    116             case XOR:
    117                 return AlphaComposite.getInstance(AlphaComposite.XOR, falpha);
    118         }
    119 
    120         Bridge.getLog().fidelityWarning(LayoutLog.TAG_BROKEN,
    121                 String.format("Unsupported PorterDuff Mode: %s", mode.name()),
    122                 null, null /*data*/);
    123 
    124         return AlphaComposite.getInstance(AlphaComposite.SRC_OVER, falpha);
    125     }
    126 
    127     // ---- native methods ----
    128 
    129     @LayoutlibDelegate
    130     /*package*/ static int nativeCreateXfermode(int mode) {
    131         PorterDuffXfermode_Delegate newDelegate = new PorterDuffXfermode_Delegate(mode);
    132         return sManager.addNewDelegate(newDelegate);
    133     }
    134 
    135     // ---- Private delegate/helper methods ----
    136 
    137     private PorterDuffXfermode_Delegate(int mode) {
    138         mMode = mode;
    139     }
    140 }
    141