53932b3803
These are just simple functions that we should start migrating drivers to using. The end goal is to remove xf86Screens and screenInfo from the ABI. This includes a define XF86_HAS_SCRN_CONV that drivers can ifdef to provide their own copies. I'll probably post a generic compat.h file for drivers later. v2: add asserts. Reviewed-by: Aaron Plattner <aplattner@nvidia.com> Reviewed-by: Keith Packard <keithp@keithp.com> Signed-off-by: Dave Airlie <airlied@redhat.com>