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PROGRAM PACK
C-----------------------------------------------------------------------
C
C February 1994 Converted to INTEGER*4 because the Acorn Archimedes
C complier does not support INTEGER*2. The resultant
C file format is the same as if INTEGER*2 were supported.
C
C Input file name changed to: <PGPLOT_DIR>.grfont/txt
C Output file name changed to: <PGPLOT_FONT>
C
C These names circumvent the 30 character limit in
C Archimedes Fortran.
C D.J. Crennell (Fortran Friends)
C
C Convert unpacked (ASCII) representation of GRFONT into packed
C (binary) representation used by PGPLOT.
C
C This version ignores characters in the input file with Hershey
C numbers 1000-1999 ("indexical" fonts) and 3000-3999 ("triplex"
C and "gothic" fonts).
C
C The binary file contains one record, and is a direct copy of the
C internal data structure used in PGPLOT. The format of the internal
C data structure (and the binary file) are private to PGPLOT: i.e.,
C they may be changed in a future release.
C
C NC1 Integer*4 Smallest Hershey number defined in file (1)
C NC2 Integer*4 Largest Hershey number defined in file (3000)
C NC3 Integer*4 Number of words of buffer space used
C INDEX Integer*4 array (dimension 3000)
C Element NC of INDEX contains either 0 if
C NC is not a defined Hershey character, or the
C index in array BUFFER at which the digitization
C of character number NC begins
C BUFFER Integer*2 array (dimension 27000)
C Coordinate pairs defining each character are
C packed two to a word in this array.
C
C Note: the array sizes are fixed by dimension statements in PGPLOT.
C New characters cannot be added if they would increase the size of
C the arrays. Array INDEX is not very efficiently used as only about
C 1000 of the possible 3000 characters are defined.
C-----------------------------------------------------------------------
INTEGER MAXCHR, MAXBUF
PARAMETER (MAXCHR=3000)
PARAMETER (MAXBUF=27000,MAXPK=MAXBUF/2)
C
INTEGER INDEX(MAXCHR)
INTEGER BUFPK(MAXPK)
INTEGER I, LENGTH, LOC, NC, NC1, NC2, NCHAR, XYGRID(400)
C-----------------------------------------------------------------------
1000 FORMAT (7(2X,2I4))
2000 FORMAT (' Characters defined: ', I5/
1 ' Array cells used: ', I5)
3000 FORMAT (' ++ERROR++ Buffer is too small: ',I7)
C-----------------------------------------------------------------------
C
C Initialize index.
C
DO 1 I=1,MAXCHR
INDEX(I) = 0
1 CONTINUE
LOC = 0
NCHAR = 0
C
C Open input file.
C
OPEN (UNIT=1, STATUS='OLD', FILE='<PGPLOT_DIR>.grfont/txt')
C
C Read input file.
C
10 CONTINUE
C -- read next character
READ (1,1000,END=20) NC,LENGTH,(XYGRID(I),I=1,5)
READ (1,1000) (XYGRID(I),I=6,LENGTH)
C -- skip if Hershey number is outside required range
IF (NC.LT.1 .OR. (NC.GT.999.AND.NC.LT.2000) .OR.
1 NC.GT.2999) GOTO 10
C -- store in index and buffer
NCHAR = NCHAR+1
LOC = LOC+1
IF (LOC.GT.MAXBUF) GOTO 500
INDEX(NC) = LOC
C pack as integer*2
LC = ISHFT(LOC+1,-1)
C*** new INTEGER*4 instructions follow:
IF(LC+LC.EQ.LOC) THEN
BUFPK(LC) = IOR(BUFPK(LC),ISHFT(XYGRID(1),16))
ELSE
BUFPK(LC) = IAND(XYGRID(1),65535)
ENDIF
C *** old INTEGER*2 instruction BUFFER(LOC) = XYGRID(1)
DO 15 I=2,LENGTH,2
LOC = LOC + 1
IF (LOC.GT.MAXBUF) GOTO 500
C pack as integer*2
IIPK = 128*(XYGRID(I)+64) + XYGRID(I+1) + 64
LC = ISHFT(LOC+1,-1)
C*** new INTEGER*4 instructions follow:
IF(LC+LC.EQ.LOC) THEN
BUFPK(LC) = IOR(BUFPK(LC),ISHFT(IIPK,16))
ELSE
BUFPK(LC) = IAND(IIPK,65535)
ENDIF
C *** old INTEGER*2: BUFFER(LOC) = 128*(XYGRID(I)+64) + XYGRID(I+1) + 64
15 CONTINUE
GOTO 10
20 CONTINUE
CLOSE (UNIT=1)
C
C Write output file.
C
OPEN (UNIT=2, STATUS='NEW', FORM='UNFORMATTED',
+ FILE='<PGPLOT_FONT>')
NC1 = 1
NC2 = 3000
WRITE (2) NC1,NC2,LOC,INDEX,BUFPK
CLOSE (UNIT=2)
C
C Write summary.
C
WRITE (6,2000) NCHAR, LOC
STOP
C
C Error exit.
C
500 WRITE (6,3000) MAXBUF
C-----------------------------------------------------------------------
END
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