Android 内存抖动 性能分析 <10>

最近刚好做图形处理方面,对图片像素进行处理,可想而知,一张图片如800*800的,那么像素点就有640000个,如果对这么大的一个数据进行运算操作,将会消耗大量内存空间,下面是自己在处理一张图片,让这张图片调整成一张老照片效果,具体操作如下:

<1> : 新建Android工程如下:



<2> : 工程里面还有其他的代码,这里只给出主要涉及的:

DurianMainActivity.java

package org.durian.duriangaussian;

import android.app.Activity;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ImageView;

public class DurianMainActivity extends Activity {

private ImageView imageView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.durian_main);

imageView=(ImageView)findViewById(R.id.image);
imageView.setImageBitmap(BitmapFactory.decodeResource(this.getResources(),R.drawable.ghh));

}

}


DurianGaussView.java

package org.durian.duriangaussian;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.os.AsyncTask;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;

/**
* Created by Administrator on 2016/1/8.
*/
public class DurianGaussView extends View {

private final static String TAG = "DurianGaussView";

private Bitmap mBitmap;
private Bitmap mOldPhotoMap;

private int mBitmapWidth;
private int mBitmapHeight;

private int mArrayColorLength;
private int mArrayColor[] = null;

private int mInColors[] = null;
private int mOutColors[] = null;

private int count = 0;

private Context mContext;

public DurianGaussView(Context context, AttributeSet attrs) {
super(context, attrs);

initView(context);

}

private void initView(Context context) {

mContext=context;
mBitmap = BitmapFactory.decodeResource(context.getResources(), R.drawable.ghh);
mBrightnessBitmap.execute();

mOldPhotoMap= BitmapFactory.decodeResource(context.getResources(), R.drawable.ghh);
mOldPhotoEffort.execute();

}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
int index=0;

//        canvas.drawBitmap(mBitmap,25.0f,25.0f,null);
canvas.drawBitmap(mOldPhotoMap,500f,25.0f,null);

/*for (int i = 0; i < 100; i++) {

int x = i - 50;
double y = Gauss.gaussFormula(x / 10);

}*/

}

private Handler mHandler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);

Log.i(TAG,"message what : " +msg.what);

invalidate();

}
};

private OldPhotoEffort mOldPhotoEffort=new OldPhotoEffort();
private class OldPhotoEffort extends AsyncTask<String,Integer,String>{
@Override
protected String doInBackground(String... params) {

Log.i(TAG,"OldPhotoEffort : ...");
mOldPhotoMap=DurianOldPhotoEffort.makeOldPhotoEffort(mContext);
mHandler.sendEmptyMessage(100);
return null;
}

@Override
protected void onPreExecute() {
super.onPreExecute();
}

@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
}

@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
}

}

private BrightnessBitmap mBrightnessBitmap=new BrightnessBitmap();
private class BrightnessBitmap extends AsyncTask<String,Integer,String>{

@Override
protected String doInBackground(String... params) {

//            mBitmap=DurianBrightness.decodeBitmap(mContext);
mHandler.sendEmptyMessage(0);
return null;
}

@Override
protected void onPreExecute() {
super.onPreExecute();
}

@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
}

@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
}
}

}

上面有两个工作线程,这里屏蔽其中一个功能.

DurianOldPhotoEffort.java

package org.durian.duriangaussian;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;

/**
* Created by Administrator on 2016/1/13.
*/
public class DurianOldPhotoEffort {

private final static String TAG="DurianOldPhotoEffort";

public static Bitmap makeOldPhotoEffort(Context context){

Bitmap bitmap= BitmapFactory.decodeResource(context.getResources(),R.drawable.ghh);

int bitmapWidth=bitmap.getWidth();
int bitmapHeight=bitmap.getHeight();
int pixLength=bitmapHeight*bitmapWidth;

int inPixs[]=new int[pixLength];
int outPixs[]=new int[pixLength];

int tr=0,tg=0,tb=0,ta=0;
int index=0;

int color=0;

Log.i(TAG, "123**********************");

for (int row=0;row<bitmapHeight;row++){

for (int col=0;col<bitmapWidth;col++){
index=row*bitmapWidth+col;

color=bitmap.getPixel(col,row);
inPixs[index]=color;

}

}

Log.i(TAG, "456**********************");

int fr=0,fg=0,fb=0;
int rows=0,cols=0;
for (rows=0;rows<bitmapHeight;rows++){

tr=0;tg=0;tb=0;ta=0;
for (cols=0;cols<bitmapWidth;cols++){
index=rows*bitmapWidth+cols;

ta=(inPixs[index]>>24) & 0xFF;
tr=(inPixs[index]>>16) & 0xFF;
tg=(inPixs[index]>>8) & 0xFF;
tb=(inPixs[index]) & 0xFF;

//
/*int fr=(int)colorBlend(noise(),(tr*0.393)+(tg*0.769)+(tb*0.189),tr);
int fg=(int)colorBlend(noise(),(tr*0.349)+(tg*0.686)+(tb*0.168),tg);
int fb=(int)colorBlend(noise(),(tr*0.272)+(tg*0.534)+(tb*0.131),tb);*/

fr=(int)colorBlend(noise(),(tr*0.393)+(tg*0.769)+(tb*0.189),tr);
fg=(int)colorBlend(noise(),(tr*0.349)+(tg*0.686)+(tb*0.168),tg);
fb=(int)colorBlend(noise(),(tr*0.272)+(tg*0.534)+(tb*0.131),tb);

outPixs[index]=(ta<<24) | (clamp(fr)<<16) | (clamp(fg)<<8) | clamp(fb);

bitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);

bitmap.setPixel(cols,rows,outPixs[index]);

}

}

Log.i(TAG, "789**********************");

return bitmap;

};

private static double noise(){
return Math.random()*0.5+0.5;
}

private static double colorBlend(double scale,double dest,double src){
return (scale*dest+(1.0-scale)*src);
}

private static int clamp(int c){
return c>255?255:((c<0)?0:c);
}

public String toString(){
return "Effect from Photoshop App !";
}

}


布局文件:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<ImageView
android:id="@+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

<org.durian.duriangaussian.DurianGaussView
android:id="@+id/durianview"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

</LinearLayout>

里面用到的图片:



<3> : 运行的结果,图片将不会被处理,控制台一直报:

01-14 00:45:27.745  15021-15036/org.durian.duriangaussian I/art﹕ Background partial concurrent mark sweep GC freed 30(1200B) AllocSpace objects, 11(24MB) LOS objects, 33% free, 32MB/48MB, paused 6.652ms total 35.034ms

<4> : 内存图:



右上角的Free和Allocated 旁边内存量大小将不断的变化,从上面的图形来看,内存抖动的非常厉害.

<5> : 解决上面的内存抖动,首先想到的是可能是下面导致的:

//用注释部分的,将会导致内存疯狂抖动
/*int fr=(int)colorBlend(noise(),(tr*0.393)+(tg*0.769)+(tb*0.189),tr);
int fg=(int)colorBlend(noise(),(tr*0.349)+(tg*0.686)+(tb*0.168),tg);
int fb=(int)colorBlend(noise(),(tr*0.272)+(tg*0.534)+(tb*0.131),tb);*/

//但是由于下面运算量,还是会疯狂抖动
fr=(int)colorBlend(noise(),(tr*0.393)+(tg*0.769)+(tb*0.189),tr);
fg=(int)colorBlend(noise(),(tr*0.349)+(tg*0.686)+(tb*0.168),tg);
fb=(int)colorBlend(noise(),(tr*0.272)+(tg*0.534)+(tb*0.131),tb);

所以把这里和相关的代码全部用到fr,fg等地方全部屏蔽掉,但是再次运行的时候发现还是不行.

继续查找:

bitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);

bitmap.setPixel(cols,rows,outPixs[index]);发现这段代码的确有问题,bitmap反复copy,我靠,有点低级错误呀.看来需要把这一句代码放在for循环外面:

bitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);

调整为:

Log.i(TAG, "456**********************");

int fr=0,fg=0,fb=0;
int rows=0,cols=0;
bitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
for (rows=0;rows<bitmapHeight;rows++){

tr=0;tg=0;tb=0;ta=0;
for (cols=0;cols<bitmapWidth;cols++){
index=rows*bitmapWidth+cols;

ta=(inPixs[index]>>24) & 0xFF;
tr=(inPixs[index]>>16) & 0xFF;
tg=(inPixs[index]>>8) & 0xFF;
tb=(inPixs[index]) & 0xFF;

fr=(int)colorBlend(noise(),(tr*0.393)+(tg*0.769)+(tb*0.189),tr);
fg=(int)colorBlend(noise(),(tr*0.349)+(tg*0.686)+(tb*0.168),tg);
fb=(int)colorBlend(noise(),(tr*0.272)+(tg*0.534)+(tb*0.131),tb);

outPixs[index]=(ta<<24) | (clamp(fr)<<16) | (clamp(fg)<<8) | clamp(fb);

bitmap.setPixel(cols,rows,outPixs[index]);

}

}

Log.i(TAG, "789**********************");

然后再重新运行:



好了问题就解决了,一行代码之差.

整个app运行效果:



左上角是没有调整的原图,下面是经过处理过的,照片发黄的效果了.