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


template< class T, class TCpp >
class JavaArrayAccessor
{
public:
    JavaArrayAccessor(JNIEnv* env, T array) :
        env(env),
        array(array),
        data(reinterpret_cast< TCpp* >(env->GetPrimitiveArrayCritical(array, NULL))) // never returns NULL
    {}

    ~JavaArrayAccessor()
    {
        env->ReleasePrimitiveArrayCritical(array, data, 0);
    }

    TCpp* getData()
    {
        return data;
    }

private:
    JNIEnv* env;
    T array;
    TCpp* data;
};


class AndroidBitmapAccessor
{
public:
    AndroidBitmapAccessor(JNIEnv* env, jobject bitmap):
        env(env),
        bitmap(bitmap),
        data(NULL)
    {
        int rv = AndroidBitmap_lockPixels(env, bitmap, reinterpret_cast< void** >(&data));
    }

    ~AndroidBitmapAccessor()
    {
        if(data)
        {
            AndroidBitmap_unlockPixels(env, bitmap);
        }
    }

    unsigned char *getData()
    {
        return data;
    }

private:
    JNIEnv* env;
    jobject bitmap;
    unsigned char *data;
};