unit of cudaMemcpy2DToArray offset parameters

Accelerated Computing CUDA CUDA Programming and Performance
1

Hi,

what is the unit of the offset parameters in cudaMemcpy2DToArray and cudaMemcpy2DFromArray?
The documentation mentions that width and height are in bytes and I assume so is the pitch. However there is no clear statement about the offset parameters. Is it bytes as well or the type of the cudaArray’s channelFormatDesc?

Thanks,
Christoph