Virtual bubble-level tool (for taking photos of documents)

[Alexander Patrakov]

Sometimes people want to take a photo of some paper document on their table. In these cases, for good results, it is critical that the camera is as horizontal as possible. Samsung camera has a virtual bubble-level tool enabled by default if it detects that the phone camera looks approximately down. I have attached a screenshot.

Here is how it works: the white dot in the middle (a "bubble") is slightly off-center if the phone is not perfectly horizontal, and the direction is indicated by the position of the bubble. If the phone is perfectly horizontal, then the bubble becomes yellow, indicating that it is OK to take a photo.

Can we have something similar in OpenCamera?