[Copyright status: this file is in the public domain.]

There are some calls which would generate protocol requests, except
that the client already has all the relevant information on hand.

A few of these are documented elsewhere.

For			See
	
lx_map_visuals		visual.txt
lx_new_conn_private	private-data.txt
lx_get_private		private-data.txt
lx_set_private		private-data.txt
lx_text_extents_8	font-info.txt

The rest are documented here for lack of anywhere else to document
them.  They return some attributes of the connection which are sent by
the server during connection startup.

Screens are numbered from 0 upward; for example, a display with 5
screens will number them 0 through 4.

When applied to an LX_CONN that has failed (for example, if there has
been a protocol error on the connection), these can fail.  The values
in this case are given as "on error".  Additionally, for the calls that
take a screen number, the "on error" value is returned in response to
passing an out-of-range screen number.

lx_nscreens
-----------

int lx_nscreens(LX_CONN *c)

Returns the number of screens available, -1 on error.

lx_default_screen
-----------------

int lx_default_screen(LX_CONN *c)

Returns the default screen number, -1 on error.

lx_min_keycode
--------------

int lx_min_keycode(LX_CONN *c)

Returns the minimum keycode value, -1 on error.

lx_max_keycode
--------------

int lx_max_keycode(LX_CONN *c)

Returns the maximum keycode value, -1 on error.

lx_root
-------

LX_XID lx_root(LX_CONN *c, int n)

Returns the root window of screen n, LX_WINDOW_None on error.

lx_root_depth
-------------

int lx_root_depth(LX_CONN *c, int n)

Returns the depth of the root window of screen n, -1 on error.

lx_root_visual
--------------

LX_XID lx_root_visual(LX_CONN *c, int n)

Returns the Visual for the root window of screen n, LX_VISUAL_None on
error.

lx_root_colormap
----------------

LX_XID lx_root_colormap(LX_CONN *c, int n)

Returns the default colormap for screen n, LX_COLORMAP_None on error.

lx_root_width
-------------

unsigned int lx_root_width(LX_CONN *c, int n)

Return width of screen n in pixels, 0 on error.

lx_root_height
--------------

unsigned int lx_root_height(LX_CONN *c, int n)

Return height of screen n in pixels, 0 on error.