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 com.android.test.hwui;
18 
19 import android.app.Activity;
20 import android.content.Context;
21 import android.graphics.Canvas;
22 import android.graphics.Paint;
23 import android.graphics.PorterDuff;
24 import android.graphics.PorterDuffXfermode;
25 import android.os.Bundle;
26 import android.view.View;
27 
28 @SuppressWarnings({"UnusedDeclaration"})
29 public class LayersActivity extends Activity {
30     @Override
onCreate(Bundle savedInstanceState)31     protected void onCreate(Bundle savedInstanceState) {
32         super.onCreate(savedInstanceState);
33         setContentView(new LayersView(this));
34     }
35 
36     public static class LayersView extends View {
37         private Paint mLayerPaint;
38         private final Paint mRectPaint;
39 
LayersView(Context c)40         public LayersView(Context c) {
41             super(c);
42 
43             mLayerPaint = new Paint();
44             mRectPaint = new Paint();
45         }
46 
47         @Override
onDraw(Canvas canvas)48         protected void onDraw(Canvas canvas) {
49             super.onDraw(canvas);
50 
51             canvas.translate(140.0f, 100.0f);
52 
53             //canvas.drawRGB(255, 255, 255);
54 
55             int count = canvas.saveLayer(0.0f, 0.0f, 200.0f, 100.0f, mLayerPaint,
56                     Canvas.ALL_SAVE_FLAG);
57 
58             mRectPaint.setColor(0xffff0000);
59             canvas.drawRect(0.0f, 0.0f, 200.0f, 100.0f, mRectPaint);
60 
61             canvas.restoreToCount(count);
62 
63             canvas.translate(0.0f, 125.0f);
64 
65             count = canvas.saveLayer(0.0f, 0.0f, 200.0f, 100.0f, mLayerPaint,
66                     Canvas.ALL_SAVE_FLAG);
67 
68             mRectPaint.setColor(0xff00ff00);
69             mRectPaint.setAlpha(50);
70             canvas.drawRect(0.0f, 0.0f, 200.0f, 100.0f, mRectPaint);
71 
72             canvas.restoreToCount(count);
73 
74             canvas.translate(25.0f, 125.0f);
75 
76             mRectPaint.setColor(0xff0000ff);
77             mRectPaint.setAlpha(255);
78             canvas.drawRect(0.0f, 0.0f, 100.0f, 50.0f, mRectPaint);
79 
80             mLayerPaint.setAlpha(127);
81             mLayerPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT));
82             count = canvas.saveLayer(50.0f, 25.0f, 150.0f, 75.0f, mLayerPaint,
83                     Canvas.ALL_SAVE_FLAG);
84 
85             mRectPaint.setColor(0xffff0000);
86             canvas.drawRect(50.0f, 25.0f, 150.0f, 75.0f, mRectPaint);
87 
88             canvas.restoreToCount(count);
89 
90             canvas.translate(0.0f, 125.0f);
91 
92             mRectPaint.setColor(0xff0000ff);
93             mRectPaint.setAlpha(255);
94             canvas.drawRect(0.0f, 0.0f, 100.0f, 50.0f, mRectPaint);
95 
96             mLayerPaint.setColor(0xffff0000);
97             mLayerPaint.setAlpha(127);
98             mLayerPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_ATOP));
99             count = canvas.saveLayer(50.0f, 25.0f, 150.0f, 75.0f, mLayerPaint,
100                     Canvas.ALL_SAVE_FLAG);
101 
102             mRectPaint.setColor(0xffff0000);
103             canvas.drawRect(50.0f, 25.0f, 150.0f, 75.0f, mRectPaint);
104 
105             canvas.restoreToCount(count);
106 
107             mLayerPaint = new Paint();
108         }
109     }
110 }
111