I'm experimenting with using OpenCV to launch my own openCL kernels.
Everything works fine so far, I followed this example: https://stackoverflow.com/a/28644721

However it seems that passing a UMat to the kernel as a const image2d_t requires

cv::ocl::Image2D image(umat_src);

But this will both allocate memory and perform the UMat to Image2D copy:

But if you want to process data in a loop and call the kernel multiple times, then Image2D constructor will keep allocating memory and device until it is full. A copy function would solve this.
Or am I doing it wrong?