Home | History | Annotate | Download | only in hwui 
      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 
     18 package com.android.test.hwui;
     19 
     20 import android.app.Activity;
     21 import android.content.Context;
     22 import android.graphics.Bitmap;
     23 import android.graphics.BitmapFactory;
     24 import android.graphics.Canvas;
     25 import android.graphics.Color;
     26 import android.graphics.LinearGradient;
     27 import android.graphics.Paint;
     28 import android.graphics.PorterDuff;
     29 import android.graphics.PorterDuffXfermode;
     30 import android.graphics.Shader;
     31 import android.os.Bundle;
     32 import android.view.View;
     33 
     34 @SuppressWarnings({"UnusedDeclaration"})
     35 public class FramebufferBlendActivity extends Activity {
     36     @Override
     37     protected void onCreate(Bundle savedInstanceState) {
     38         super.onCreate(savedInstanceState);
     39 
     40         setContentView(new BlendView(this));
     41     }
     42 
     43     static class BlendView extends View {
     44         private int mTexWidth;
     45         private int mTexHeight;
     46         private Paint mPaint;
     47         private LinearGradient mHorGradient;
     48         private Bitmap mTexture;
     49 
     50         BlendView(Context c) {
     51             super(c);
     52 
     53             mTexture = BitmapFactory.decodeResource(c.getResources(), R.drawable.sunset1);
     54             mTexWidth = mTexture.getWidth();
     55             mTexHeight = mTexture.getHeight();
     56 
     57             mHorGradient = new LinearGradient(0.0f, 0.0f, mTexWidth, 0.0f,
     58                     Color.BLACK, Color.WHITE, Shader.TileMode.CLAMP);
     59 
     60             mPaint = new Paint();
     61         }
     62 
     63         @Override
     64         protected void onDraw(Canvas canvas) {
     65             super.onDraw(canvas);
     66             canvas.drawRGB(255, 255, 255);
     67 
     68             canvas.save();
     69             canvas.translate(40.0f, 40.0f);
     70 
     71             drawBlendedBitmap(canvas, PorterDuff.Mode.DARKEN);
     72             drawBlendedBitmap(canvas, PorterDuff.Mode.LIGHTEN);
     73             drawBlendedBitmap(canvas, PorterDuff.Mode.MULTIPLY);
     74 
     75             canvas.restore();
     76 
     77             canvas.save();
     78             canvas.translate(40.0f + mTexWidth + 40.0f, 40.0f);
     79 
     80             drawBlendedBitmap(canvas, PorterDuff.Mode.SCREEN);
     81             drawBlendedBitmap(canvas, PorterDuff.Mode.ADD);
     82             drawBlendedBitmapInverse(canvas, PorterDuff.Mode.OVERLAY);
     83 
     84             canvas.restore();
     85         }
     86 
     87         private void drawBlendedBitmap(Canvas canvas, PorterDuff.Mode mode) {
     88             mPaint.setShader(null);
     89             mPaint.setXfermode(null);
     90             canvas.drawBitmap(mTexture, 0.0f, 0.0f, mPaint);
     91 
     92             mPaint.setShader(mHorGradient);
     93             mPaint.setXfermode(new PorterDuffXfermode(mode));
     94             canvas.drawRect(0.0f, 0.0f, mTexWidth, mTexHeight, mPaint);
     95 
     96             canvas.translate(0.0f, 40.0f + mTexHeight);
     97         }
     98 
     99         private void drawBlendedBitmapInverse(Canvas canvas, PorterDuff.Mode mode) {
    100             mPaint.setXfermode(null);
    101             mPaint.setShader(mHorGradient);
    102             canvas.drawRect(0.0f, 0.0f, mTexWidth, mTexHeight, mPaint);
    103 
    104             mPaint.setXfermode(new PorterDuffXfermode(mode));
    105             mPaint.setShader(null);
    106             canvas.drawBitmap(mTexture, 0.0f, 0.0f, mPaint);
    107 
    108             canvas.translate(0.0f, 40.0f + mTexHeight);
    109         }
    110     }
    111 }
    112