JPEG.svobject

  © 1994 by Andreas R. Kleinert.

  FREEWARE. All rights reserved.
  This software is based in part on the work of the Independent JPEG Group.

  Version      : 2.2
  Release Date : 06.06.1994


  Requirements
  ~~~~~~~~~~~~
  - OS V2.04+ (V37)+ and its libraries
  - 68020+, optimized for 68030
  - superviewsupport.library V1+


  Description
  ~~~~~~~~~~~
  JPEG.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 JPEG Files as they are written by
  "The Independent JPEG Group's JPEG Software" (release 4).

  In detail these are :

  Reading :

   - JPEG (IJG-JFIF), with output in 256 Colors

  Writing :

   (not yet supported : soon ?!)


  Remarks
  ~~~~~~~
  Temporary data will be written to a directory assigned to "JPEGTMP:",
  if neccessary, but please note, that this JPEG-SVObject may not work
  with all files and may sometimes crash !
  When writing large temporary files, crashing might be very _dangerous_ :
  So don't blame me, if your harddisk get's affected this way.

  OK, let's get to the more positive things :
  Since the small problems in the first beta version, some bugs in using
  the IJG-Sources have been fixed, and so almost any JPEG (".JPG") pictures
  out there should be read and displayed correctly.


  ControlPad-Switches
  ~~~~~~~~~~~~~~~~~~~
  ControlPad-Name     : "ENV:superview-library/JPEG.controlpad"
  ControlPad-Commands : - COLORDEPTH = <8/24>
			  ; shell the output be 8 or 24 Bit Data ?
			  ; default is 8 Bit data


  Limitations
  ~~~~~~~~~~~
  Please note, that the Decoding Routines of the Library are not (yet)
  fully re-entrant, so that only one Task may Decode a picture at a time.
  The Library itself manages it, that the other Task has to Delay() until
  the Decoding Routines are "free" again.
  This makes NOT REALLY A MATTER, because Decoding takes so much of the
  processor's time, that it is NOT EFFICIENT to DECODE TWO OR MORE
  pictures AT THE SAME TIME ANYWAY !


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


  History
  ~~~~~~~
  V2.2 (06.06.1994) :

   - removed superviewsupport.library from package, use the version
     supplied with superview.library V6+ instead !


  V2.1 (21.05.1994) :

   - beta-version(s) : V2.0 (nearly all major bugs fixed now)
   - first "public release" version


  Literature
  ~~~~~~~~~~
  [1] The Independent JPEG Group's software package with Source-Code(s)
      and Documentation.
      (See statement at the top of this Doc-File !)

  Credits
  ~~~~~~~
  This software is based in part on the work of the Independent JPEG Group.
  Release 4 of 10-Dec-92 was used (as found on the Walnut Creek "Source
  Code CDROM", March 1994, Directory "MSDOS/GRAPHICS", File "JPEGSRC4.ZIP").


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