.Dd September 8, 2018
.Dt GFXX 1
.Os "Causal Agency"
.Sh NAME
.Nm gfxx
.Nd graphics data explorer
.Sh SYNOPSIS
.Nm
.Op Fl fm
.Op Fl c Ar space
.Op Fl p Ar file
.Op Fl e Ar lb
.Op Fl E Ar lb
.Op Fl b Ar bits
.Op Fl n Ar offset
.Op Fl w Ar width
.Op Fl z Ar scale
.Op Fl o Ar prefix
.Sh DESCRIPTION
.Nm
is an interactive graphics data explorer
capable of dumping PNGs.
.Pp
The arguments are as follows:
.Bl -tag -width Ds
.It Fl E Ar lb
Set bit order to little or big endian.
.It Fl b Ar bits
Set number of bits of padding,
red,
green
and blue
components.
Four digits are required.
.It Fl c Ar space
Set color space to one of
.Cm indexed ,
.Cm grayscale ,
.Cm rgb .
.It Fl e Ar lb
Set byte order to little or big endian.
.It Fl f
Flip display vertically.
.It Fl m
Mirror display horizontally.
.It Fl n Ar offset
Set byte offset into data.
.It Fl o Ar prefix
Set PNG output filename prefix.
.It Fl p Ar file
Load indexed color palette from
.Ar file .
.It Fl w Ar width
Set display column width.
.It Fl z Ar scale
Set display scale.
.El
.Pp
The interactive keys are as follows:
.Bl -tag -width Ds
.It Ic q
Quit.
.It Ic x
Export one frame as PNG.
.It Ic X
Export each frame as PNG.
.It Ic o
Print interactive options.
.It Ic []
Select color space.
.It Ic p
Sample indexed palette from top-left corner.
.It Ic P
Export indexed palette as RGB data.
.It Ic {}
Select bits preset.
.It Ic e
Toggle byte order.
.It Ic E
Toggle bit order.
.It Ic hl
Adjust offset by byte.
.It Ic jk
Adjust offset by pixel.
.It Ic HL
Adjust offset by pixel row.
.It Ic JK
Adjust offset by pixel row square.
.It Ic ,.
Adjust display column width.
.It Ic <>
Adjust display column width by half or double.
.It Ic f
Toggle vertically flipped display.
.It Ic m
Toggle horizontally mirrored display.
.It Ic -+
Adjust display scale.
.It Ic 0-9
Set bits.
.El
.Sh SEE ALSO
.Xr pngo 1