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researchv10 Dan Cross

.TH BITFILE 9.5
.CT 1 comm_other
.SH NAME
bitfile \- format of bitmap file
.SH DESCRIPTION
Binary files produced by
.IR blitblt (9.1)
and other bitmap-generating programs
are formatted as follows:
.TP 12
Byte no.
Description
.TP
0, 1:
Zero.
.TP
2, 3:
.IR x -coordinate
of the rectangle origin (low-order byte, high-order byte).
.TP
4, 5:
.IR Y -coordinate
of the rectangle origin (low-order byte, high-order byte).
.TP
6, 7:
.IR x -coordinate
of the rectangle corner (low-order byte, high-order byte).
.TP
8, 9:
.IR Y -coordinate
of the rectangle corner (low-order byte, high-order byte).
.TP
remainder:
Compressed raster data.
Each raster is exclusive-or'd
with the previous one, and
zero-extended (if necessary) to a 16-bit boundary.
It is then encoded into
byte sequences, each of which consists of a control byte followed by
two or more data bytes:
.TP 12
Control
Data
.TP
.IR n " (< 127)"
.RI 2\(mu n
bytes of raster data, running from left to right.
.TP
.BI "0x80+" n
2 bytes of raster data, to be replicated from left to right
.I n
times.
.LP
There are also two
.SM ASCII
formats in current use.
Textures and 16\(mu16 icons,
as created by
.IR icon (9.1),
are encoded as a
.B Texture
declaration with initializer,
to be copied unchanged into C program source; see
.IR types (9.5).
Faces and other large icons
are without any surrounding C syntax.
In either case, each scan line of the
bitmap is a comma-separated list of C-style short
hexadecimal constants; scan lines are separated by newlines.
.SH "SEE ALSO"
.IR blitblt (9.1), 
.IR icon (9.1), 
.IR types (9.5), 
.IR vismon (9.1)

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