Belgian Amiga Club - ADF Collection/BS1 part 05.zip/BS1 part 5/IM_3.adf/Exec/piarc.LZH/jpeg.rexx

OS/2 REXX Batch file | 1992-06-22 | 9KB | 379 lines

/*
 * JPEG.rexx
 *
 *  Written by: Ben Williams
 * Last Update: March 4th, 1992
 *         For: Black Belt Systems image processing series IM, IM F/c, and IP.
 * ---------------------------------------------------------------------------
 *    Revision: 1.07
 */
parse arg var1
/*
 * open rexxsupport.library -- needed for some functions
 */
if ~show('L',"rexxsupport.library") then do
  if addlib('rexxsupport.library',0,-30,0) then do
      /* everything's ok */
    end;
  else do
    say 'We Have A Library Problem, Unable To Load "rexxsupport.library"';
    say 'Cannot operate JPEG.rexx without this library - sorry!';
    exit 10;
    end;
  end;

/*
 * This will automatically direct the script to the proper
 * software, if it is running.
 */
prtnme = 'IP_Port'; /* assume Image Professional */
if show('P','IP_Port') = 0 then do
  if show('P','IM_Port') = 0 then do
    say "Can't find image processor's ARexx port!!!"; /* not running? */
    say "This script requires IP, IM or IM F/c to run!";
    exit(20);
    end;
  else do
    prtnme = 'IM_Port'; /* That's the thing about assumptions... */
    end;                 /* We make em, user's break em.          */
  end;

  /*
   * This code attempts to read a file called "picmdpath" from REXX:
   * If it can't find it, the script will assume that the commands
   * associated with this PI Module are in "c:". If the file exists,
   * the script will look in the path that is specified in the file.
   * If you create this file, you MUST put a complete, correct path
   * in it; if the commands are in a sub-directory, you have to put
   * the trailing slash on the path (like, device:dir/).
   *
   */
  cmdpath = 'c:';
  if open(fhandle,'rexx:picmdpath','read') then  /* open the file */
    do
      cmdpath = readln(fhandle);
      call close(fhandle);  /* close the file    */
    end

/*
 * Prompt user - load, or save?
 */
if var1 = 'load' then do
  pick = 1
  end
else if var1 = 'save' then do
  pick = 2
  end
else do
    address(prtnme);
    'tofront';
    options results;
    'gadgets "Load","JFIF/JPEG","Save","JFIF/JPEG"';
    pick = result;
    options;
    address;
    end;

if pick=0 then do
  exit 0;
  end;

/*
 * PI driver for compressor
 */
if pick=2 then do /* compression */

  bufname = 'image';
  strn = ' -q ';
  address(prtnme);

  options results;
  'askprop "Compression/Damage Factor","0","0","100"';
  qfact = result;
  'askyn "Good compression","Best Compression"';
  compr = result;
  options;

  if compr = 1 then do
    strn = ' -E'||strn;
    end;

  prevpath = 'ram:'; /* put user in ram to start with... */
  if show('C',jpegpath) = 1 then do
    prevpath = getclip(jpegpath);
    end;

  options results;
  'current';
  bufdata = result; /* get name of buffer, if there is one */
  parse var bufdata bname ',' bnum ',' bx ',' by ',' btot ',' bmem ',' bparname ',' bparnum;
  if bname ~= '<none>' then do
    bufname = bname;
    end;
  if (length(bufname) > 4) then do
    epos = pos('.jpg',bufname,length(bufname)-4);
    if epos ~= 0 then do
      bufname = left(bufname,epos-1)
      end
    end;
  'filerequest "'||prevpath||'","'||bufname||'",".jpg","Save JPEG"';
  jpegfile = result;
  options;

  if jpegfile = 'FR_CANCELLED' then do
    address(prtnme);
    'imtofront';
    exit 0;
    end;

jpegfile = expandfilename(jpegfile); /* make filename complete path */
thispath = gimmepath(jpegfile);
call setclip(jpegpath,thispath);

  address(prtnme);
  options results;
  'jackin';
  jackadr = result;
  options;

  'wbtofront';
  address command cmdpath||'wrjpg >"'||jpegfile||'" -j'||jackadr||strn||qfact;

  address(prtnme);
  'imtofront';
  address;

  exit 0;

  end;

else do /* decompression */

/*
 * Setup default path
 */
  prevpath = 'ram:'; /* put user in ram to start with... */
/*
 * Now, get old path if it exists
 */
  if show('C',jpegpath) = 1 then do
    prevpath = getclip(jpegpath);
    end;

  address(prtnme);
  options results;
  'current';
  bufdata = result; /* get name of buffer, if there is one */
  parse var bufdata bname ',' bnum ',' bx ',' by ',' btot ',' bmem ',' bparname ',' bparnum;
  if bname ~= '<none>' then do
    bufname = bname;
    end;
  if (length(bufname) > 4) then do
    epos = pos('.jpg',bufname,length(bufname)-4);
    if epos ~= 0 then do
      bufname = left(bufname,epos-1)
      end
    end;
  'filerequest "'||prevpath||'","'||bufname||'",".jpg","Load JPEG"';
  jpegfile = result;
  options;

  if jpegfile = 'FR_CANCELLED' then do
    address(prtnme);
    'imtofront';
    exit 0;
    end;

  jpegfile = expandfilename(jpegfile);
  thispath = gimmepath(jpegfile);
  call setclip(jpegpath,thispath);

  fileinfo = statef(jpegfile);
  parse var fileinfo fitype fibytes fiblocks fiflags fidays fimins fiticks ficomment;

  if fitype = '' then do
    'message Cannot locate "'jpegfile'" for processing';
    exit 10;
    end;

  if fibytes < 170 then do
    "message This file is too small to be a JFIF formatted JPEG file";
    exit 10;
    end;

  if fitype = 'DIR' then do
    'message Must specify a file, not a directory';
    exit 10;
    end;

/*
 * at this point, we have at least some assurance that we
 * have a real JPEG file to work with. Now, we need to look into
 * the file and see how big the image is, so we can open a new
 * buffer of the appropriate size.
 */

  call open(fhandle,jpegfile,'read');      /* open the file     */
  if rvalue() ~= 65496 then do /* FFD8 */
    'message Not a JFIF file! - Initial read fails';
    call close(fhandle);
    exit(0);
    end;

  work=1;
  do while work = 1
    thisid = rvalue();
    thisln = rvalue();
    thisda = readch(fhandle,thisln-2);
    select
      when thisid = 65472 | thisid < 65488 then do /* FFC0-FFCF (SOF0-15) */
        height = c2d(substr(thisda,2,2));
        width  = c2d(substr(thisda,4,2));
        work=0;
        end;
      when thisid = 65504 then do  /* FFE0 */
        fid = left(thisda,4);
        if fid ~= 'JFIF' then do
          'message Not a JFIF file!';
          call close(fhandle);
          exit 0;
          end;
        end;
      otherwise do
        nop;
        end;
      end;
    end;

  call close(fhandle);                     /* close the file    */

  if height < 0 then do
    "message Bad height: "||height;
    exit 0;
    end;

  if height > 32767 then do
    "message Bad height: "||height;
    exit 0;
    end;

  if width < 0 then do
    "message Bad width: "||width;
    exit 0;
    end;

  if width > 32767 then do
    "message Bad width: "||width;
    exit 0;
    end;

  address(prtnme);

  'imtofront'; /* show user the IM screen */
  /* is there already a primary buffer??? */
  options results;
  'current';
  bufdata = result;
  options;

  parse var bufdata bname ',' bnum ',' bx ',' by ',' btot ',' bmem ',' bparname ',' bparnum
  if bname ~= '<none>' then do
    address(prtnme);
    options results;
    'askyn '||'"Replace Primary ['||bname||']" "New As Primary"'
    prefs = result;
    options;
    address;
    if prefs = 0 then do
      address(prtnme);
      'killbuff '||bnum; /* this kills the Primary Buffer */
      address;
    end;
  end;

  /* New buffer is created at current resolution */
  address(prtnme);
  'autoredraw 0';
  options results;
  'newbuf '||width||' '||height;
  if rc ~= 0 then do
    "message Can't allocate buffer!";
    'autoredraw 1';
    exit 0;
    end
  bnum = result;
  'rename '||bnum||' 'gxname;
  'newcurrent '||bnum;
  address;

  address(prtnme);
  options results;
  'jackin';
  jackadr = result;
  options;

  'wbtofront';
  'lockimage '||bnum;
  address command cmdpath||'rdjpg -j'||jackadr||' "'||jpegfile||'"';
  'unlockimage '||bnum;

  address(prtnme);
  'imtofront';
  'redraw';
  address;

  exit 0;

end;

/*
 * gimmepath
 *
 * This takes the provided argument and sucks the path out of it, then
 * returns that path to the caller, sans file name.
 */
gimmepath:
  arg fullnamegx;
    tempgx = reverse(fullnamegx);
    lengx = length(fullnamegx);   /* get length of string */
    slashdex = index(tempgx,'/'); /* first occurance of '/' from right */
    colondex = index(tempgx,':');  /* first occurance of ':' from right */
    seploc = 0; /* assumes current dir, no path supplied */
    if slashdex ~= 0 then do /* we assume we are in a DIR */
      seploc = (lengx - slashdex)+1;
      end;
    else do
      if colondex ~= 0 then do /* we assume we are on a device */
        seploc = (lengx - colondex)+1;
        end;
      end;
  gxname = substr(fullnamegx,seploc+1); /* if you ever need it */
  gxpath = left(fullnamegx,seploc);
  return(gxpath);

/*
 * Since this script can't be expected to know where the CD of the user
 * is when this cmd is invoked, we have to check the path the user
 * provides - if it's not specified right from a root, then we have
 * to make it a complete specification from the root.
 */
expandfilename:
  parse arg jfile;
  if index(jfile,':') = 0 then do
    curdir = pragma(D);
    if right(curdir,1) ~= ':' then do
      if right(curdir,1) ~= '/' then do
        if curdir ~= '' then do
          curdir = curdir || '/';
          end;
        end;
      end;
    jfile = curdir||jfile;
    end;
  return(jfile);

rvalue:
  wordnum = c2d(readch(fhandle,1)) * 256;
  wordnum = wordnum + c2d(readch(fhandle,1));
  return wordnum;