Android NDK 数字图像处理

package zc.jni.image;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Bitmap.Config;
import android.view.Menu;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity 
{
ImageView imgImageIn = null;
ImageView imgImageOut = null;
private Bitmap bmpOrigIn = null;
private Bitmap bmpGrayOut = null;

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

this.imgImageIn = (ImageView)findViewById(R.id.imgBmpIn);
this.imgImageOut = (ImageView)findViewById(R.id.imgBmpOut);

        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inPreferredConfig = Config.ARGB_8888;
        bmpOrigIn = BitmapFactory.decodeResource(this.getResources(), R.drawable.tyr, options);
        if (bmpOrigIn != null) 
        {
        imgImageIn.setImageBitmap(bmpOrigIn);
        imgImageOut.setImageBitmap(bmpOrigIn);
        }  
}

public void OnButtonColor2Gray(View view) 
{
    this.bmpGrayOut = Bitmap.createBitmap(this.bmpOrigIn.getWidth(), this.bmpOrigIn.getHeight(), Config.ALPHA_8);
    myConvertToGray(this.bmpOrigIn, this.bmpGrayOut);
//     maoColor2Gray(this.bmpOrigIn, this.bmpGrayOut, this.bmpOrigIn.getWidth(), this.bmpOrigIn.getHeight(), 24);
    Toast.makeText(getApplicationContext(), "图像处理完毕！", Toast.LENGTH_SHORT).show();
    this.imgImageOut.setImageBitmap(this.bmpGrayOut);
}

public void OnButtonReset(View view) 
{
        this.imgImageOut.setImageBitmap(this.bmpOrigIn);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) 
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

public native void myConvertToGray(Bitmap bmpIn, Bitmap bmpOut);
public native void maoColor2Gray(Bitmap bmpIn, Bitmap bmpOut, int width, int height, int PixelFormat);

static 
{
System.loadLibrary("JniImageDemo");
}
}

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS) 
LOCAL_MODULE := JniImageDemo 
LOCAL_SRC_FILES := Color2Gray.c
LOCAL_LDLIBS := -llog -ljnigraphics
include $(BUILD_SHARED_LIBRARY)

#include <jni.h>
#include <string.h>
#include <android/log.h>
#include <android/bitmap.h>

char* native_string(char *ch)
{
return ch;
}

jstring
Java_zc_jni_image_MainActivity_ShowString( JNIEnv *env,
  jobject this )
{
return (*env)->NewStringUTF(env, native_string("Hello from \"native_string\" !"));
}

typedef struct 
{
    uint8_t alpha;
    uint8_t red;
    uint8_t green;
    uint8_t blue;
} argb;

JNIEXPORT void JNICALL Java_zc_jni_image_MainActivity_myConvertToGray( JNIEnv * env, 
  jobject  obj, 
  jobject bmpColor,
  jobject bmpGray )
{
    AndroidBitmapInfo  infoColor;
    void*              pixColor; 
    AndroidBitmapInfo  infoGray;
    void*              pixGray;
    int                retValue;
    int   y;
    int                x;

    if ((retValue = AndroidBitmap_getInfo(env, bmpColor, &infoColor)) < 0) 
    {
        return;
    }

    if ((retValue = AndroidBitmap_getInfo(env, bmpGray, &infoGray)) < 0) 
    {
        return;
    }
 
    if (infoColor.format != ANDROID_BITMAP_FORMAT_RGBA_8888) 
    {
        return;
    }

    if (infoGray.format != ANDROID_BITMAP_FORMAT_A_8) 
    {
        return;
    }
  
    if ((retValue = AndroidBitmap_lockPixels(env, bmpColor, &pixColor)) < 0) 
    {
    }

    if ((retValue = AndroidBitmap_lockPixels(env, bmpGray, &pixGray)) < 0) 
    {
    }

    for( y = 0; y < infoColor.height; y ++ ) 
    {
    argb * line = (argb *) pixColor;
    uint8_t * grayline = (uint8_t *) pixGray;
    for ( x = 0 ; x < infoColor.width; x++ ) 
    {
    grayline[x] = 0.3 * line[x].red + 0.59 * line[x].green + 0.11*line[x].blue;
    }
   
    pixColor = (char *)pixColor + infoColor.stride;
    pixGray = (char *) pixGray + infoGray.stride;
    }
    
    AndroidBitmap_unlockPixels(env, bmpColor);
    AndroidBitmap_unlockPixels(env, bmpGray);
}