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NAME
     rasterfile - Sun's file format for raster images

SYNOPSIS
     #include <rasterfile.h>

DESCRIPTION
     A rasterfile is composed of three parts:   first,  a  header
     containing  8  integers;  second,  a (possibly empty) set of
     colormap values; and third, the pixel image, stored  a  line
     at a time, in increasing y order.  The image is layed out in
     the file as in a memory pixrect.  Each line of the image  is
     rounded up to the nearest 16 bits.

     The header is defined by the following structure:

          struct rasterfile {
               int  ras_magic;
               int  ras_width;
               int  ras_height;
               int  ras_depth;
               int  ras_length;
               int  ras_type;
               int  ras_maptype;
               int  ras_maplength;
          };

     The ras_magic field always contains the following constant:

          #define   RAS_MAGIC 0x59a66a95

     The ras_width, ras_height, and ras_depth fields contain  the
     image's  width  and  height in pixels, and its depth in bits
     per pixel, respectively.   The  depth  is  either  1  or  8,
     corresponding   to   standard   frame  buffer  depths.   The
     ras_length field contains the length in bytes of  the  image
     data.   For  an  unencoded  image, this number is computable
     from the ras_width, ras_height, and  ras_depth  fields,  but
     for  an  encoded image it must be explicitly stored in order
     to be available without decoding the  image  itself.   Note:
     the  length of the header and of the (possibly empty) color-
     map values are not included in the value of  the  ras_length
     field;  it  is  only  the image data length.  For historical
     reasons, files of type RT_OLD will usually have a 0  in  the
     ras_length  field,  and software expecting to encounter such
     files should be prepared to compute the  actual  image  data
     length  if needed.  The ras_maptype and ras_maplength fields
     contain the type and length in bytes of the colormap values,
     respectively.   If  ras_maptype  is  not  RMT_NONE  and  the
     ras_maplength is not 0, then the  colormap  values  are  the
     ras_maplength  bytes  immediately  after  the header.  These
     values are either  uninterpreted  bytes  (usually  with  the
     ras_maptype  set  to RMT_RAW) or the equal length red, green
     and blue vectors, in that order  (when  the  ras_maptype  is
     RMT_EQUAL_RGB).  In  the latter case, the ras_maplength must
     be three times the size in bytes of any one of the vectors.

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