Android fb0 截屏实现

问题：我们有几个项目，在项目1和项目2上实现截屏是没有问题的，但是在项目3上实现截屏是不行的

原因：分辨率差异引起的问题，分辨率长宽一定要是32的整数倍

Dear customer,

Sorry for the late reply due to annual leave.

I don't think this issue relates with thedifference between MIPI DSI and LCDC.

I think that this issue relates with stride, thatis to say, which depends on width pixel.

Due to Tiled-based BLT enginee on MDP side, thetiled size is 32(w)x32(h).

For 480(w)x800(h), no this issue, so that 480divided by 32 = 15 (integer). 800 divided by 32 = 25 (integer).

For 240(w)x320(h), have this issue, because that240 divided by 32 = 7.5 (float), need add 16, that is to say, (240 + 16)divided by 32 = 8 (integer), 320 divided by 32 = 10 (integer). But on LCDpanel, shows no any issue.

For 540(w)x960(h), have this issue, because that540 divided by 32 = 16.875(float), need add 4, that it so say, (540 + 4)divided by 32 = 17(integer), 960 divided by 32 = 30 (integer). But on LCDpanel, shows no any issue.

The above all information is why for this. Alsofor 650red.raw, if input 256 as width, input 320 as height, this shows normalwith tools.



APK截屏代码：

package com.example.framebuffer;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;

import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.PixelFormat;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Display;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;

public class MainActivity extends Activity {
	public static int height; //屏幕高
	public static int width ;    //屏幕的宽
	public static int deepth;//位深
	
	ScreenShotFb fb;
	public static String TAG="weiqifa";
	final static String FB0FILE1 = "/dev/graphics/fb0";
	static File fbFile;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		
		//getWindow().setFlags(WindowManager.LayoutParams.FILL_PARENT, WindowManager.LayoutParams.FILL_PARENT);  //设置全屏
		super.onCreate(savedInstanceState);
		this.requestWindowFeature(Window.FEATURE_NO_TITLE);//去掉标题栏
		setContentView(R.layout.fragment_main);
		Log.d(TAG,"com.example.camerajni onCreate");
		//getPiture();
		Button t;
		
		t=(Button)findViewById(R.id.button);
		
		t.setOnClickListener(new Button.OnClickListener(){//创建监听    
            public void onClick(View v) {    
                String strTmp = "点击Button01";    
                getPiture();
                Log.d(TAG,strTmp);
            }  
        });   
		

		//fb.init(this);
		//fb.shoot();
	}
	
	public static int[] convertToColor(byte[] piex) throws Exception {
		switch (deepth) {
		case 2:
			return convertToColor_2byte(piex);
		case 3:
			return convertToColor_3byte(piex);
		case 4:
			return convertToColor_4byte(piex);
		default:
			Log.e(TAG, "wwwwwException error");
			return convertToColor_3byte(piex);
		}
	}
public static int[] convertToColor_2byte(byte[] piex) {
		int[] colors = new int[width * height];
		int len = piex.length;
		for (int i = 0; i < len; i += 2) {
			int colour = (piex[i+1] & 0xFF) << 8 | (piex[i] & 0xFF);
			int r = ((colour & 0xF800) >> 11)*8;
			int g = ((colour & 0x07E0) >> 5)*4;
			int b = (colour & 0x001F)*8;
			int a = 0xFF;
			colors[i / 2] = (a << 24) + (r << 16) + (g << 8) + b;
		}
		return colors;
	}

	public static int[] convertToColor_3byte(byte[] piex) {
		int[] colors = new int[width * height];
		int len = piex.length;
		for (int i = 0; i < len; i += 3) {
			int r = (piex[i] & 0xFF);
			int g = (piex[i + 1] & 0xFF);
			int b = (piex[i + 2] & 0xFF);
			int a = 0xFF;
			colors[i / 3] = (a << 24) + (r << 16) + (g << 8) + b;
		}
		return colors;
	}

	public static int[] convertToColor_4byte(byte[] piex) {
		int[] colors = new int[width * height];
		int len = piex.length;
		for (int i = 0; i < len; i += 4) {
			int r = (piex[i] & 0xFF);
			int g = (piex[i + 1] & 0xFF);
			int b = (piex[i + 2] & 0xFF);
			int a = (piex[i + 3] & 0xFF);
			colors[i / 4] = (a << 24) + (r << 16) + (g << 8) + b;
		}
		return colors;
	}
	
	public  void getPiture()
	{
		FileInputStream buf = null;
		//获取屏幕大小：
		DisplayMetrics metrics =new DisplayMetrics();
		WindowManager WM = (WindowManager)this.getSystemService(Context.WINDOW_SERVICE);
		Display display = WM.getDefaultDisplay();
		display.getMetrics(metrics);
		 height = metrics.heightPixels; //屏幕高
		 width = metrics.widthPixels;    //屏幕的宽
		//		获取显示方式
		int pixelformat = display.getPixelFormat();
		PixelFormat localPixelFormat1 =new PixelFormat();
		PixelFormat.getPixelFormatInfo(pixelformat, localPixelFormat1);
		 deepth = localPixelFormat1.bytesPerPixel;//位深
		 //deepth=3;
		try{
		//InputStream stream =getInputStream();
		fbFile = new File(FB0FILE1);
		buf = new FileInputStream(fbFile);// 读取文件内容
		InputStream stream=new DataInputStream(buf);
		//byte[] piex = new byte[height * width * deepth];
		byte[] piex = new byte[height * (width+16) * deepth];
		DataInputStream dStream = new DataInputStream(stream);
		int i=0;
		
		//while(dStream.read(piex, 0, height * width * deepth) != -1){
		while(dStream.read(piex, 0, height * (width+16) * deepth) != -1){
					//int[] data = convertToColor(piex);
					//Bitmap bm = Bitmap.createBitmap(data, width, height, Bitmap.Config.RGB_565);
				    // data = null;
					//FileOutputStream out = new FileOutputStream("/sdcard/test"+".png");
					//bm.compress(Bitmap.CompressFormat.PNG, 50,out);
					Log.d(TAG,"Debug"+"height="+height+"  width="+width);
					// 保存图片
					int[] colors = new int[height * width];
					int j=0;
					for(int m=0;m<piex.length;m++){
						
						if(m%4 == 0){
							int r = (piex[m] & 0xFF);
							int g = (piex[m+1] & 0xFF);
							int b = (piex[m+2] & 0xFF);
							int a = (piex[m+3] & 0xFF);
							colors[m/4]= (a << 24) + (r <<16) + (g <<8) + b;
							Log.d(TAG,"m="+m+"  r=piex[m]="+r+"   g=piex[m+1]="+g+"  b=piex[m+2]="+b+"  a=piex[m+3]"+a+"  colors.length"+colors.length);
//							if(a==0xFF)
//							{
//								colors[j]= (a << 24) + (r <<16) + (g <<8) + b;
//							    j++;	
//							}else{
//								//Log.d(TAG,"a="+a+"   m="+m);
//							}
						 }
					}
					//piex生成bitmap
					Bitmap bitmap = Bitmap.createBitmap(colors, width, height, Bitmap.Config.ARGB_8888);
					//bitmap保存为png格式：
					FileOutputStream out = new FileOutputStream("/sdcard/test"+".png");
					bitmap.compress(Bitmap.CompressFormat.PNG, 100,out);
					Log.d(TAG," height="+height+" width="+width+" deepth="+deepth+" piex.length="+piex.length+" colors.length="+colors.length);
				}
		}catch(Exception e){
			Log.e(TAG, "Exception error");
		}
	}
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.framebuffer"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />

    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.framebuffer.MainActivity"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.NoTitleBar.Fullscreen" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>