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.layoutlib.bridge.impl.DelegateManager;
20import com.android.layoutlib.bridge.impl.PorterDuffUtility;
21import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
22
23import android.graphics.PorterDuff.Mode;
24
25import java.awt.Composite;
26
27import 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 */
44public 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