Android通过jni返回Mat数据类型方法

// java
Mat res = new Mat();
jni_fun(res.getNativeObjAddr());

//jni c++
void jni_fun(jlong Mataddr){
   Mat* res = (Mat*)MatAddr;
   Mat image = ImgProcess();
   res->create(image.rows,image.cols,image.type());
   memcpy(res->data,image.data,image.rows*image.step);

//java 
Mat res = new Mat();
jni_fun(srcMat.getNativeObjAddr(),res.getNativeObjAddr());
 
//c++
void jni_fun(jlong srcMat,jlong resMat){
    Mat* src = (Mat*)srcMat;
    Mat* res = (Mat*)srcMat;
    Mat image = ImgProcess(*src);
    ...
    ...
}