FBM.svobject

  © 1994 by Andreas R. Kleinert.

  FREEWARE. All rights reserved.

  Version      : 2.4
  Release Date : 16.04.1994


  Description
  ~~~~~~~~~~~
  FBM.svobject is an external Library-Module for the superview.library V2+.

  It contains SVDriver-Support for the superview.library V3+, and
  needs any SVDriver with ChunkyPixel-Support.

  It supports reading and writing of FBM (Unix) Files.
  In detail these are :

  Reading :

   FBM (Unix) upto 256 Colors (8 Bit), either with Colortable or
   grey-scaled (selfgenerated).
   Black & White with physbits=1 not supported.


  Writing :

   FBM (Unix) upto 256 Colors (8 Bit).

   Following to the specifications, an 2..128 Colors file takes as much
   space as an 256 Colors file : always 8 Bits are written.
   Only the ColorMap is sized differently for different ColorDepths.


  Author
  ~~~~~~
  Andreas R. Kleinert
  Grube Hohe Grethe 23
  D-57074 Siegen
  Germany


  History
  ~~~~~~~
  V2.4 (16.04.1994) :

   - improved internal "grey-scale-generation"-routine.
     It produced sometimes wrong values for the last GreyScale-Color,
     which should have been real "white".
     The wrong values were like this :
      -   4 GreyScales,  4. Color : 192/192/192
      -  16 GreyScales, 16. Color : 240/240/240
      - 255 GreyScales, 16. Color : 255/255/255
     This is now fixed. Side-effect : the grey-value below "white"
     now has a bigger distance to it than to the previous value
     (2*256/colornum instead of 256/colornum).


  V2.3 (27.03.1994) :

   - removed internal SVDriver-Replacement, so that we now are really
     dependent on external SVDrivers in libs:svdrivers.
     This saves about 1600 Bytes diskspace and reduces redundancy.
   - replaced SAS/C's sprintf()-routine with own, RawDoFmt()-based one.
     This saves again about 1800 Bytes.
   - now using Utility-Library for integer operations (activated
     SAS/C's UTILLIB option) : this increases 68000-codesize a little
     bit, but increases speed on 68020+ systems
     (should also decrease codesize, but does not ...)


  V2.2 (25.03.1994) :

   - slightly improved internal BitMap-to-BitMap routine
   - now also writes FBM (Unix) upto 256 Colors (8 Bit).
   - fixed ColorMap-generation for grey-scaled pictures with less than
     8 Bit Depth (256 grey-scales) : values had been too small (too dark)


  V2.1 (19.03.1994) :

   - first version, not yet with write-support


  Credits
  ~~~~~~~
  For getting information on the FBM-Format I took a look into the
  file "fbm.h" and other source-files, which describe this file format
  and are part of FBM Release 1.0 25-Feb-90 by Michael Mauldin.
  No source-code from this package - only the "pure information" - has
  been used for FBM.svobject.


  Copyrights
  ~~~~~~~~~~
  Some of the mentioned names or products above may be copyrighted by
  companies or trademarks of companies.