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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 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
     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 
     40         public LayersView(Context c) {
     41             super(c);
     42 
     43             mLayerPaint = new Paint();
     44             mRectPaint = new Paint();
     45         }
     46 
     47         @Override
     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