BITFILE(9.5)                                         BITFILE(9.5)

     NAME
          bitfile - format of bitmap file

     DESCRIPTION
          Binary files produced by blitblt(9.1), twid(9.6) and other
          bitmap-generating programs are formatted as follows:

          Byte no.    Description

          0, 1:       Zero.

          2, 3:       X-coordinate of the rectangle origin (low-order
                      byte, high-order byte).

          4, 5:       Y-coordinate of the rectangle origin (low-order
                      byte, high-order byte).

          6, 7:       X-coordinate of the rectangle corner (low-order
                      byte, high-order byte).

          8, 9:       Y-coordinate of the rectangle corner (low-order
                      byte, high-order byte).

          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:

          Control     Data

               2*n bytes of raster data, running from left to
                      right.

          0x80 + n    2 bytes of raster data, to be replicated from
                      left to right n times.

          There are also two ASCII formats in current use.  Textures
          and 16×16 icons, typically created by icon(9.1), are encoded
          as a Texture declaration with initializer, to be copied
          unchanged into C program source; see 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.

     SEE ALSO
          blitblt(9.1), icon(9.1), twid(9.1), types(9.5), sysmon(9.1),
          can(1)