That’s a good question. I will say that the processing time for each editing step done on a raw file is longer than when done on a jpeg. It leads me to believe that the entire processing pipeline for a raw image in Snapseed is done at higher bit depth, but I cannot absolutely confirm that. These were just casual tests. I suppose the best way would be to shoot an image with raw + jpeg, and then process both with the same settings (getting as close as possible with the raw development tools) to see if there is a quality difference in the output image.