drm_rect_rotate

drm_rect_rotate_inv
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Name

drm_rect_rotate_inv — Inverse rotate the rectangle

Synopsis

`void drm_rect_rotate_inv (`	struct drm_rect * `r`,
	int `width`,
	int `height`,
	unsigned int `rotation)`;

Arguments

r: rectangle to be rotated
width: Width of the coordinate space
height: Height of the coordinate space
rotation: Transformation whose inverse is to be applied

Description

Apply the inverse of rotation to the coordinates of rectangle r.

width and height combined with rotation define the location of the new origin.

width correcsponds to the horizontal and height to the vertical axis of the original untransformed coordinate space, so that you never have to flip them when doing a rotatation and its inverse. That is, if you do:

drm_rotate(r, width, height, rotation); drm_rotate_inv(r, width, height, rotation);

you will always get back the original rectangle.