CallPNM24.svoperator

  © 1995 by Andreas R. Kleinert.

  FREEWARE. All rights reserved.

  Version      : 1.2
  Release Date : 15.07.1995


  Requirements
  ~~~~~~~~~~~~
  - OS V2.04+ (V37)+ and its libraries
  - superviewsupport.library V5+


  Description
  ~~~~~~~~~~~
  CallPNM.svoperator is an external SV_GfxBuffer modification module
  for superview.library V9+.

  This is not an operator in the common sense.

  Instead it is just an Interface to allow easy access to any external
  operators from the well known PBM package (distributed as NetPBM).

  When using this operator, the given GfxBuffer will be saved as
  a 24 Bit PNM file (8 Bit input as well), after that the specified
  PBM program module will be externally called and its output will
  be written into another temporary file.
  This file then will be parsed through superview.library (perhaps
  it will be in PNM format, but one never know) and the buffer will
  be returned as the result of the "CallPNM" operation.

  Please note, that the whole internal construction of the operator
  is a little bit more complicated than usual, so that any error
  handling will perhaps not always result in very clear statements
  (can't parse the output of the PBM programs).
  BTW, any temporary files will of course be placed into "VMEM:",
  from where they will be deleted later.


  Author
  ~~~~~~
  Andreas R. Kleinert
  Grube Hohe Grethe 23
  D-57074 Siegen
  Germany                  Andreas_Kleinert@superview.ftn.sub.org


  ControlPad-Switches
  ~~~~~~~~~~~~~~~~~~~
  ControlPad-Name     : "ENV:superview-library/CallPNM24.controlpad"
  ControlPad-Commands : - PNMCOMMAND=<PBM command path and name>
                          ; PNM command to be called
                          ; e.g. PNMCOMMAND=Work:NetPBM/pnm/pnmscale
                        - PNMOPTIONS=<Options>
                          ; Options for PNM command to be called
                          ; e.g. PNMOPTIONS=-xscale 2.0 -yscale 2.0


  History
  ~~~~~~~
  V2.2 (15.07.1995) :

   - fixed CPInfo-file, now correct version is as well included
     with superview-lib's env-dir as JPEG's env-dir
   - adjusted Installer script

  V2.1 (01.05.1995) :

   - first public release


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