.\"
.\" Copyright (c) 2024 Netflix, Inc.
.\"
.\" SPDX-License-Identifier: BSD-2-Clause
.\"
.Dd February 6, 2024
.Dt GFX.LUA 8
.Os
.Sh NAME
.Nm gfx.lua
.Nd Fx Lua gfx module
.Sh DESCRIPTION
The built-in graphics related Lua bindings for the
.Fx
boot loaders using the Lua interpreter are available via the
.Ic gfx
table.
.Ss Exported Functions
The following functions are exported in the
.Nm loader
table.
.Bl -tag -width term_putimage
.It Fn fb_bezier x0 y0 x1 y1 x2 y2 width
Draw a bezier curve through the points
.Pq Va x0 , Va y0 ,
.Pq Va x1 , Va y1 ,
and
.Pq Va x2 , Va y2
of width
.Va width .
The units are in pixels and have an origin of
.Pq 0 , 0 .
.It Fn fb_drawrect x0 y0 x1 y1 fill
Fill in a rectangle with the pixel
.Va fill
with the corners
.Pq Va x0 , Va y0
and
.Pq Va x1 , Va y1 .
The units are in pixels and have an origin of
.Pq 0 , 0 .
.It Fn fb_line x0 y0 x1 y1 width
Draw a line from
.Pq Va x0 , Va y0
to
.Pq Va x1 , Va y1
with a width of
.Va width .
The units are in pixels and have an origin of
.Pq 0 , 0 .
.It Fn fb_putimage name x0 y0 x1 y1 f
Load the PNG file
.Va name
and place it in the rectangle
with the corners
.Pq Va x0 , Va y0
and
.Pq Va x1 , Va y1
and fill with pixel
.Va f .
The units are in pixels and have an origin of
.Pq 0 , 0 .
.It Fn fb_set_pixel x y
Sets the pixel at
.Pq Va x , Va y .
The units are in pixels and have an origin of
.Pq 0 , 0 .
.It Fn term_drawrect x0 y0 x1 y1
Draw the outline of a rectangle with the text coordinate corners of
.Pq Va x0 , Va y0
and
.Pq Va x1 , Va y1 .
The units are in character cells and have an origin of
.Pq 1 , 1 .
.It Fn term_putimage name x0 y0 x1 y1 f
Load the PNG file
.Va name
and place it in the rectangle
with the text coordinate corners
.Pq Va x0 , Va y0
and
.Pq Va x1 , Va y1
and fill with pixel
.Va f .
The units are in character cells and have an origin of
.Pq 1 , 1 .
.El
.Pp
This table is optional and should only be used if it is non-nil and if
.Fn core.isFramebufferConsole
is true.
.Ss Compatibility
All the interfaces described above are also available via the
.Ic loader
table through at last FreeBSD 15.0.
.Sh SEE ALSO
.Xr loader.conf 5 ,
.Xr core.lua 8 ,
.Xr loader 8 ,
.Xr loader.lua 8
.Sh AUTHORS
The
.Nm
man page was written by
.An Warner Losh Aq Mt imp@FreeBSD.org .