drm_rotation_simplify — Try to simplify the rotation
unsigned int drm_rotation_simplify ( | unsigned int rotation, |
unsigned int supported_rotations); |
Attempt to simplify the rotation to a form that is supported. Eg. if the hardware supports everything except DRM_REFLECT_X
drm_rotation_simplify(rotation, BIT(DRM_ROTATE_0) | BIT(DRM_ROTATE_90) | BIT(DRM_ROTATE_180) | BIT(DRM_ROTATE_270) | BIT(DRM_REFLECT_Y));
to eliminate the DRM_ROTATE_X flag. Depending on what kind of transforms the hardware supports, this function may not be able to produce a supported transform, so the caller should check the result afterwards.