How can I control the inpainting result from the mask fit the other region of the image

[csyhping]

Hi @mashb1t , I have an image of the room, and some black regions are not scanned; I want to paint the black region, given the black region is the mask. I also provided a prompt that described the room. However, the unpainted results are wired. I expect the inpainting result to be something like a floor. Do you have any idea how can I achieve this? Many thanks!!!
Input image
Inpainting result