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pack_f.for
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SUBROUTINE PACK_F(N,CMPR,MX,MY,IMG)
Cf2py intent(in) N
Cf2py intent(in) CMPR
Cf2py depend(N) CMPR
Cf2py intent(in) MX
Cf2py intent(in) MY
Cf2py intent(in,out) IMG
Cf2py depend(MX,MY) IMG
IMPLICIT NONE
INTEGER*4 BITDECODE(0:7),SETBITS(0:16),IN,N,MX,MY,BITNUM
INTEGER*4 PIXEL,SPILLBITS,USEDBITS,VALIDS,WINDOW,TOTAL
INTEGER*4 IMG(0:MX-1,0:MY-1),NEXTINT
INTEGER*4 SPILL,ROW,COL,PIXNUM,MM1
INTEGER*2 TMP
CHARACTER*1 CMPR(0:N-1)
DATA BITDECODE /0,4,5,6,7,8,16,32/
DATA SETBITS /Z'0000',Z'0001',Z'0003',Z'0007',
1 Z'000F',Z'001F',Z'003F',Z'007F',Z'00FF',
1 Z'01FF',Z'03FF',Z'07FF',Z'0FFF',Z'1FFF',
1 Z'3FFF',Z'7FFF',Z'FFFF'/
PIXEL = 0
SPILLBITS = 0
SPILL = 0
USEDBITS = 0
VALIDS = 0
WINDOW = 0
ROW = 0
COL = 0
TOTAL = MX*MY
MM1 = MX-1
IN = 0
DO WHILE (PIXEL .LT. TOTAL)
IF (VALIDS .LT. 6) THEN
IF (SPILLBITS .GT. 0) THEN
WINDOW = IOR(WINDOW,ISHFT(SPILL,VALIDS))
VALIDS = VALIDS + SPILLBITS
SPILLBITS = 0
ELSE
SPILL = ICHAR(CMPR(IN))
IN = IN+1
SPILLBITS = 8
END IF
ELSE
PIXNUM = ISHFT(1,IAND(WINDOW,SETBITS(3)))
WINDOW = ISHFT(WINDOW,-3)
BITNUM = BITDECODE(IAND(WINDOW,SETBITS(3)))
WINDOW = ISHFT(WINDOW,-3)
VALIDS = VALIDS-6
DO WHILE ( (PIXNUM .GT. 0) .AND. (PIXEL .LT. TOTAL) )
IF ( VALIDS .LT. BITNUM ) THEN
IF ( SPILLBITS .GT. 0 ) THEN
WINDOW = IOR(WINDOW,ISHFT(SPILL,VALIDS))
IF ( (32-VALIDS) .GT. SPILLBITS ) THEN
VALIDS = VALIDS + SPILLBITS
SPILLBITS = 0
ELSE
USEDBITS = 32-VALIDS
SPILL = ISHFT(SPILL,-USEDBITS)
SPILLBITS = SPILLBITS-USEDBITS
VALIDS = 32
END IF
ELSE
SPILL = ICHAR(CMPR(IN))
IN = IN+1
SPILLBITS = 8
END IF
ELSE
PIXNUM = PIXNUM-1
IF ( BITNUM .EQ. 0 ) THEN
NEXTINT = 0
ELSE
NEXTINT = IAND(WINDOW,SETBITS(BITNUM))
VALIDS = VALIDS-BITNUM
WINDOW = ISHFT(WINDOW,-BITNUM)
IF ( BTEST(NEXTINT,BITNUM-1) )
1 NEXTINT = IOR(NEXTINT,NOT(SETBITS(BITNUM)))
END IF
ROW = PIXEL/MX
COL = MOD(PIXEL,MX)
IF ( PIXEL .GT. MX ) THEN
IF ( COL .EQ. 0 ) THEN
TMP = NEXTINT +
1 (IMG(MM1,ROW-1)+IMG(COL+1,ROW-1)+
1 IMG(COL,ROW-1)+IMG(MM1,ROW-2) +2)/4
ELSE IF ( COL.EQ.MM1 ) THEN
TMP = NEXTINT +
1 (IMG(COL-1,ROW)+IMG(0,ROW)+
1 IMG(MM1,ROW-1)+IMG(MM1-1,ROW-1) +2)/4
ELSE
TMP = NEXTINT +
1 (IMG(COL-1,ROW)+IMG(COL+1,ROW-1)+
1 IMG(COL,ROW-1)+IMG(COL-1,ROW-1) +2)/4
END IF
ELSE IF (PIXEL .NE. 0) THEN
TMP = IMG(COL-1,ROW)+NEXTINT
ELSE
TMP = NEXTINT
END IF
IMG(COL,ROW) = TMP
PIXEL = PIXEL+1
END IF
END DO
END IF
END DO
DO ROW=0,MM1
DO COL=0,MM1
IF ( IMG(COL,ROW).LT.0 ) IMG(COL,ROW) = IMG(COL,ROW)+65536
END DO
END DO
RETURN
END
SUBROUTINE PACK_F3(N,CMPR,MX,MY,IMG)
Cf2py intent(in) N
Cf2py intent(in) CMPR
Cf2py depend(N) CMPR
Cf2py intent(in) MX
Cf2py intent(in) MY
Cf2py intent(in,out) IMG
Cf2py depend(MX,MY) IMG
IMPLICIT NONE
INTEGER*4 BITDECODE(0:7),SETBITS(0:16),IN,N,MX,MY,BITNUM
INTEGER*4 PIXEL,SPILLBITS,USEDBITS,VALIDS,WINDOW,TOTAL
INTEGER*4 IMG(0:MX-1,0:MY-1),NEXTINT
INTEGER*4 SPILL,ROW,COL,PIXNUM,MM1
INTEGER*2 TMP
INTEGER*1 CMPR(0:N-1)
DATA BITDECODE /0,4,5,6,7,8,16,32/
DATA SETBITS /Z'0000',Z'0001',Z'0003',Z'0007',
1 Z'000F',Z'001F',Z'003F',Z'007F',Z'00FF',
1 Z'01FF',Z'03FF',Z'07FF',Z'0FFF',Z'1FFF',
1 Z'3FFF',Z'7FFF',Z'FFFF'/
PIXEL = 0
SPILLBITS = 0
SPILL = 0
USEDBITS = 0
VALIDS = 0
WINDOW = 0
ROW = 0
COL = 0
TOTAL = MX*MY
MM1 = MX-1
IN = 0
DO WHILE (PIXEL .LT. TOTAL)
IF (VALIDS .LT. 6) THEN
IF (SPILLBITS .GT. 0) THEN
WINDOW = IOR(WINDOW,ISHFT(SPILL,VALIDS))
VALIDS = VALIDS + SPILLBITS
SPILLBITS = 0
ELSE
SPILL = ICHAR(CHAR(CMPR(IN)))
IN = IN+1
SPILLBITS = 8
END IF
ELSE
PIXNUM = ISHFT(1,IAND(WINDOW,SETBITS(3)))
WINDOW = ISHFT(WINDOW,-3)
BITNUM = BITDECODE(IAND(WINDOW,SETBITS(3)))
WINDOW = ISHFT(WINDOW,-3)
VALIDS = VALIDS-6
DO WHILE ( (PIXNUM .GT. 0) .AND. (PIXEL .LT. TOTAL) )
IF ( VALIDS .LT. BITNUM ) THEN
IF ( SPILLBITS .GT. 0 ) THEN
WINDOW = IOR(WINDOW,ISHFT(SPILL,VALIDS))
IF ( (32-VALIDS) .GT. SPILLBITS ) THEN
VALIDS = VALIDS + SPILLBITS
SPILLBITS = 0
ELSE
USEDBITS = 32-VALIDS
SPILL = ISHFT(SPILL,-USEDBITS)
SPILLBITS = SPILLBITS-USEDBITS
VALIDS = 32
END IF
ELSE
SPILL = ICHAR(CHAR(CMPR(IN)))
IN = IN+1
SPILLBITS = 8
END IF
ELSE
PIXNUM = PIXNUM-1
IF ( BITNUM .EQ. 0 ) THEN
NEXTINT = 0
ELSE
NEXTINT = IAND(WINDOW,SETBITS(BITNUM))
VALIDS = VALIDS-BITNUM
WINDOW = ISHFT(WINDOW,-BITNUM)
IF ( BTEST(NEXTINT,BITNUM-1) )
1 NEXTINT = IOR(NEXTINT,NOT(SETBITS(BITNUM)))
END IF
ROW = PIXEL/MX
COL = MOD(PIXEL,MX)
IF ( PIXEL .GT. MX ) THEN
IF ( COL .EQ. 0 ) THEN
TMP = NEXTINT +
1 (IMG(MM1,ROW-1)+IMG(COL+1,ROW-1)+
1 IMG(COL,ROW-1)+IMG(MM1,ROW-2) +2)/4
ELSE IF ( COL.EQ.MM1 ) THEN
TMP = NEXTINT +
1 (IMG(COL-1,ROW)+IMG(0,ROW)+
1 IMG(MM1,ROW-1)+IMG(MM1-1,ROW-1) +2)/4
ELSE
TMP = NEXTINT +
1 (IMG(COL-1,ROW)+IMG(COL+1,ROW-1)+
1 IMG(COL,ROW-1)+IMG(COL-1,ROW-1) +2)/4
END IF
ELSE IF (PIXEL .NE. 0) THEN
TMP = IMG(COL-1,ROW)+NEXTINT
ELSE
TMP = NEXTINT
END IF
IMG(COL,ROW) = TMP
PIXEL = PIXEL+1
END IF
END DO
END IF
END DO
DO ROW=0,MM1
DO COL=0,MM1
IF ( IMG(COL,ROW).LT.0 ) IMG(COL,ROW) = IMG(COL,ROW)+65536
END DO
END DO
RETURN
END