Variable: image-transform-rotation
image-transform-rotation is a buffer-local variable defined in
image-mode.el.gz.
Documentation
Rotation angle for the image in the current Image mode buffer.
Probably introduced at or before Emacs version 27.1.
Source Code
;; Defined in /usr/src/emacs/lisp/image-mode.el.gz
(defvar-local image-transform-rotation 0.0
"Rotation angle for the image in the current Image mode buffer.")