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greg |
2.1 |
/* Copyright (c) 1994 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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/* |
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* Convert from Radiance picture file to Compuserve GIF. |
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* Currently, we don't know how to get back. |
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*/ |
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#include <stdio.h> |
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#include "color.h" |
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#include "resolu.h" |
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#ifdef MSDOS |
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#include <fcntl.h> |
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#endif |
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#include <math.h> |
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#define MAXCOLORS 256 |
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int rmap[MAXCOLORS]; |
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int gmap[MAXCOLORS]; |
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int bmap[MAXCOLORS]; |
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int currow; |
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extern long ftell(); |
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long picstart; |
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extern BYTE clrtab[][3]; |
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extern int getgifpix(); |
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COLR *scanln; |
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int xmax, ymax; /* picture size */ |
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double gamv = 2.2; /* gamma correction */ |
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int greyscale = 0; /* convert to B&W? */ |
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int bradj = 0; /* brightness adjustment */ |
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char *progname; |
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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{ |
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int ncolors = 0; |
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int bitsperpix; |
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int i; |
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#ifdef MSDOS |
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extern int _fmode; |
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_fmode = O_BINARY; |
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setmode(fileno(stdin), O_BINARY); |
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setmode(fileno(stdout), O_BINARY); |
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#endif |
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progname = argv[0]; |
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for (i = 1; i < argc; i++) |
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if (argv[i][0] == '-') |
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switch (argv[i][1]) { |
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case 'g': |
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gamv = atof(argv[++i]); |
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break; |
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case 'b': |
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greyscale = 1; |
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break; |
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case 'c': |
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ncolors = atoi(argv[++i]); |
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break; |
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case 'e': |
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if (argv[i+1][0] != '+' && argv[i+1][0] != '-') |
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goto userr; |
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bradj = atoi(argv[++i]); |
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break; |
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default: |
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goto userr; |
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} |
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else |
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break; |
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if (i < argc-2) |
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goto userr; |
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if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) { |
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fprintf(stderr, "%s: cannot open input \"%s\"\n", |
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progname, argv[i]); |
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exit(1); |
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} |
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if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) { |
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fprintf(stderr, "%s: cannot open output \"%s\"\n", |
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progname, argv[i+1]); |
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exit(1); |
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} |
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if (checkheader(stdin, COLRFMT, NULL) < 0 || |
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fgetresolu(&xmax, &ymax, stdin) < 0) { |
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fprintf(stderr, "%s: bad picture format\n", progname); |
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exit(1); |
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} |
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picstart = ftell(stdin); |
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currow = -1; |
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scanln = (COLR *)malloc(xmax*sizeof(COLR)); |
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if (scanln == NULL) { |
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fprintf(stderr, "%s: out of memory\n", progname); |
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exit(1); |
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} |
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/* set up gamma correction */ |
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setcolrgam(gamv); |
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/* figure out the bits per pixel */ |
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if (ncolors < 2 | ncolors > MAXCOLORS) |
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ncolors = MAXCOLORS; |
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for (bitsperpix = 1; ncolors > 1<<bitsperpix; bitsperpix++) |
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; |
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/* compute color map */ |
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if (greyscale) |
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mkgrymap(ncolors); |
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else |
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mkclrmap(ncolors); |
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/* convert image */ |
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GIFEncode(stdout, xmax, ymax, 0, 0, bitsperpix, |
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rmap, gmap, bmap, getgifpix); |
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exit(0); |
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userr: |
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fprintf(stderr, |
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"Usage: %s [-b][-c ncolors][-g gamv][-e +/-stops] input [output]\n", |
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progname); |
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exit(1); |
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} |
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getrow(y) /* get the specified row from our image */ |
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int y; |
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{ |
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if (y == currow) |
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return; |
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if (y < currow) { |
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fseek(stdin, picstart, 0); |
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currow = -1; |
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} |
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do |
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if (freadcolrs(scanln, xmax, stdin) < 0) { |
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fprintf(stderr, "%s: error reading picture (y==%d)\n", |
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progname, ymax-1-y); |
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} |
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while (++currow < y); |
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if (bradj) |
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shiftcolrs(scanln, xmax, bradj); |
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colrs_gambs(scanln, xmax); |
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} |
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mkclrmap(nc) /* make our color map */ |
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int nc; |
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{ |
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register int i; |
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new_histo(); |
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for (i = 0; i < ymax; i++) { |
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getrow(i); |
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cnt_colrs(scanln, xmax); |
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} |
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new_clrtab(nc); |
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for (i = 0; i < nc; i++) { |
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rmap[i] = clrtab[i][RED]; |
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gmap[i] = clrtab[i][GRN]; |
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bmap[i] = clrtab[i][BLU]; |
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} |
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} |
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mkgrymap(nc) |
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int nc; |
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{ |
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register int i; |
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for (i = 0; i < nc; i++) { |
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rmap[i] = |
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gmap[i] = |
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bmap[i] = ((unsigned)i<<8)/nc; |
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} |
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} |
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int |
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getgifpix(x, y) /* get a single pixel from our picture */ |
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int x, y; |
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{ |
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int pix; |
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getrow(y); |
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if (greyscale) |
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return(normbright(scanln[x])); |
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return(map_pixel(scanln[x])); |
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} |
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/* |
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* SCARY GIF code follows . . . . sorry. |
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* |
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* Based on GIFENCOD by David Rowley <[email protected]>.A |
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* Lempel-Zim compression based on "compress". |
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* |
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*/ |
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/***************************************************************************** |
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* |
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* GIFENCODE.C - GIF Image compression interface |
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* |
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* GIFEncode( FName, GHeight, GWidth, GInterlace, Background, |
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* BitsPerPixel, Red, Green, Blue, GetPixel ) |
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* |
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*****************************************************************************/ |
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typedef int (* ifunptr)(); |
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#define TRUE 1 |
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#define FALSE 0 |
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int Width, Height; |
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int curx, cury; |
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long CountDown; |
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int Pass; |
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int Interlace; |
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unsigned long cur_accum = 0; |
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int cur_bits = 0; |
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/* |
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* Bump the 'curx' and 'cury' to point to the next pixel |
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*/ |
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BumpPixel() |
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{ |
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curx++; |
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if( curx == Width ) { |
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curx = 0; |
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if( !Interlace ) { |
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cury++; |
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} else { |
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switch( Pass ) { |
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case 0: |
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cury += 8; |
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if( cury >= Height ) { |
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Pass++; |
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cury = 4; |
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} |
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break; |
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case 1: |
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cury += 8; |
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if( cury >= Height ) { |
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Pass++; |
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cury = 2; |
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} |
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break; |
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case 2: |
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cury += 4; |
| 262 |
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if( cury >= Height ) { |
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Pass++; |
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cury = 1; |
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} |
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break; |
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case 3: |
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cury += 2; |
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break; |
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} |
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} |
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} |
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} |
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/* |
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* Return the next pixel from the image |
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*/ |
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GIFNextPixel( getpixel ) |
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ifunptr getpixel; |
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{ |
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int r; |
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if( CountDown == 0 ) |
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return EOF; |
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CountDown--; |
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r = (*getpixel)( curx, cury ); |
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BumpPixel(); |
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return r; |
| 289 |
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} |
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/* |
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* public GIFEncode |
| 293 |
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*/ |
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GIFEncode( fp, GWidth, GHeight, GInterlace, Background, |
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BitsPerPixel, Red, Green, Blue, GetPixel ) |
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FILE *fp; |
| 297 |
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int GWidth, GHeight; |
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int GInterlace; |
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int Background; |
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int BitsPerPixel; |
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int Red[], Green[], Blue[]; |
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ifunptr GetPixel; |
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{ |
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int B; |
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int RWidth, RHeight; |
| 306 |
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int LeftOfs, TopOfs; |
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int Resolution; |
| 308 |
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int ColorMapSize; |
| 309 |
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int InitCodeSize; |
| 310 |
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int i; |
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| 312 |
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long cur_accum = 0; |
| 313 |
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cur_bits = 0; |
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Interlace = GInterlace; |
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ColorMapSize = 1 << BitsPerPixel; |
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RWidth = Width = GWidth; |
| 318 |
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RHeight = Height = GHeight; |
| 319 |
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LeftOfs = TopOfs = 0; |
| 320 |
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Resolution = BitsPerPixel; |
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| 322 |
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CountDown = (long)Width * (long)Height; |
| 323 |
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Pass = 0; |
| 324 |
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if( BitsPerPixel <= 1 ) |
| 325 |
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InitCodeSize = 2; |
| 326 |
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else |
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InitCodeSize = BitsPerPixel; |
| 328 |
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curx = cury = 0; |
| 329 |
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fwrite( "GIF87a", 1, 6, fp ); |
| 330 |
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Putword( RWidth, fp ); |
| 331 |
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Putword( RHeight, fp ); |
| 332 |
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B = 0x80; /* Yes, there is a color map */ |
| 333 |
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B |= (Resolution - 1) << 5; |
| 334 |
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B |= (BitsPerPixel - 1); |
| 335 |
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fputc( B, fp ); |
| 336 |
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fputc( Background, fp ); |
| 337 |
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fputc( 0, fp ); |
| 338 |
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for( i=0; i<ColorMapSize; i++ ) { |
| 339 |
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fputc( Red[i], fp ); |
| 340 |
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fputc( Green[i], fp ); |
| 341 |
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fputc( Blue[i], fp ); |
| 342 |
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} |
| 343 |
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fputc( ',', fp ); |
| 344 |
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Putword( LeftOfs, fp ); |
| 345 |
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Putword( TopOfs, fp ); |
| 346 |
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Putword( Width, fp ); |
| 347 |
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Putword( Height, fp ); |
| 348 |
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if( Interlace ) |
| 349 |
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fputc( 0x40, fp ); |
| 350 |
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else |
| 351 |
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fputc( 0x00, fp ); |
| 352 |
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fputc( InitCodeSize, fp ); |
| 353 |
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compress( InitCodeSize+1, fp, GetPixel ); |
| 354 |
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fputc( 0, fp ); |
| 355 |
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fputc( ';', fp ); |
| 356 |
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fclose( fp ); |
| 357 |
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} |
| 358 |
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| 359 |
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/* |
| 360 |
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* Write out a word to the GIF file |
| 361 |
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*/ |
| 362 |
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Putword( w, fp ) |
| 363 |
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int w; |
| 364 |
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FILE *fp; |
| 365 |
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{ |
| 366 |
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fputc( w & 0xff, fp ); |
| 367 |
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fputc( (w/256) & 0xff, fp ); |
| 368 |
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} |
| 369 |
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| 370 |
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| 371 |
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/*************************************************************************** |
| 372 |
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* |
| 373 |
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* GIFCOMPR.C - GIF Image compression routines |
| 374 |
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* |
| 375 |
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* Lempel-Ziv compression based on 'compress'. GIF modifications by |
| 376 |
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* David Rowley ([email protected]) |
| 377 |
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* |
| 378 |
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***************************************************************************/ |
| 379 |
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| 380 |
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#define CBITS 12 |
| 381 |
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#define HSIZE 5003 /* 80% occupancy */ |
| 382 |
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| 383 |
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/* |
| 384 |
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* a code_int must be able to hold 2**CBITS values of type int, and also -1 |
| 385 |
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*/ |
| 386 |
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typedef int code_int; |
| 387 |
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typedef long int count_int; |
| 388 |
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typedef unsigned char char_type; |
| 389 |
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| 390 |
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/* |
| 391 |
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* |
| 392 |
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* GIF Image compression - modified 'compress' |
| 393 |
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* |
| 394 |
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* Based on: compress.c - File compression ala IEEE Computer, June 1984. |
| 395 |
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* |
| 396 |
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* By Authors: Spencer W. Thomas (decvax!harpo!utah-cs!utah-gr!thomas) |
| 397 |
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* Jim McKie (decvax!mcvax!jim) |
| 398 |
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* Steve Davies (decvax!vax135!petsd!peora!srd) |
| 399 |
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* Ken Turkowski (decvax!decwrl!turtlevax!ken) |
| 400 |
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* James A. Woods (decvax!ihnp4!ames!jaw) |
| 401 |
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* Joe Orost (decvax!vax135!petsd!joe) |
| 402 |
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* |
| 403 |
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*/ |
| 404 |
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#include <ctype.h> |
| 405 |
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| 406 |
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#define ARGVAL() (*++(*argv) || (--argc && *++argv)) |
| 407 |
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| 408 |
|
|
int n_bits; /* number of bits/code */ |
| 409 |
|
|
int maxbits = CBITS; /* user settable max # bits/code */ |
| 410 |
|
|
code_int maxcode; /* maximum code, given n_bits */ |
| 411 |
|
|
code_int maxmaxcode = (code_int)1 << CBITS; /* should NEVER generate this code */ |
| 412 |
|
|
# define MAXCODE(n_bits) (((code_int) 1 << (n_bits)) - 1) |
| 413 |
|
|
|
| 414 |
|
|
count_int htab [HSIZE]; |
| 415 |
|
|
unsigned short codetab [HSIZE]; |
| 416 |
|
|
#define HashTabOf(i) htab[i] |
| 417 |
|
|
#define CodeTabOf(i) codetab[i] |
| 418 |
|
|
|
| 419 |
|
|
code_int hsize = HSIZE; /* for dynamic table sizing */ |
| 420 |
|
|
|
| 421 |
|
|
/* |
| 422 |
|
|
* To save much memory, we overlay the table used by compress() with those |
| 423 |
|
|
* used by decompress(). The tab_prefix table is the same size and type |
| 424 |
|
|
* as the codetab. The tab_suffix table needs 2**CBITS characters. We |
| 425 |
|
|
* get this from the beginning of htab. The output stack uses the rest |
| 426 |
|
|
* of htab, and contains characters. There is plenty of room for any |
| 427 |
|
|
* possible stack (stack used to be 8000 characters). |
| 428 |
|
|
*/ |
| 429 |
|
|
#define tab_prefixof(i) CodeTabOf(i) |
| 430 |
|
|
#define tab_suffixof(i) ((char_type *)(htab))[i] |
| 431 |
|
|
#define de_stack ((char_type *)&tab_suffixof((code_int)1<<CBITS)) |
| 432 |
|
|
|
| 433 |
|
|
code_int free_ent = 0; /* first unused entry */ |
| 434 |
|
|
|
| 435 |
|
|
/* |
| 436 |
|
|
* block compression parameters -- after all codes are used up, |
| 437 |
|
|
* and compression rate changes, start over. |
| 438 |
|
|
*/ |
| 439 |
|
|
int clear_flg = 0; |
| 440 |
|
|
int offset; |
| 441 |
|
|
long int in_count = 1; /* length of input */ |
| 442 |
|
|
long int out_count = 0; /* # of codes output (for debugging) */ |
| 443 |
|
|
|
| 444 |
|
|
/* |
| 445 |
|
|
* compress stdin to stdout |
| 446 |
|
|
* |
| 447 |
|
|
* Algorithm: use open addressing double hashing (no chaining) on the |
| 448 |
|
|
* prefix code / next character combination. We do a variant of Knuth's |
| 449 |
|
|
* algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-prime |
| 450 |
|
|
* secondary probe. Here, the modular division first probe is gives way |
| 451 |
|
|
* to a faster exclusive-or manipulation. Also do block compression with |
| 452 |
|
|
* an adaptive reset, whereby the code table is cleared when the compression |
| 453 |
|
|
* ratio decreases, but after the table fills. The variable-length output |
| 454 |
|
|
* codes are re-sized at this point, and a special CLEAR code is generated |
| 455 |
|
|
* for the decompressor. Late addition: construct the table according to |
| 456 |
|
|
* file size for noticeable speed improvement on small files. Please direct |
| 457 |
|
|
* questions about this implementation to ames!jaw. |
| 458 |
|
|
*/ |
| 459 |
|
|
|
| 460 |
|
|
int g_init_bits; |
| 461 |
|
|
FILE *g_outfile; |
| 462 |
|
|
int ClearCode; |
| 463 |
|
|
int EOFCode; |
| 464 |
|
|
|
| 465 |
|
|
compress( init_bits, outfile, ReadValue ) |
| 466 |
|
|
int init_bits; |
| 467 |
|
|
FILE *outfile; |
| 468 |
|
|
ifunptr ReadValue; |
| 469 |
|
|
{ |
| 470 |
|
|
register long fcode; |
| 471 |
|
|
register code_int i = 0; |
| 472 |
|
|
register int c; |
| 473 |
|
|
register code_int ent; |
| 474 |
|
|
register code_int disp; |
| 475 |
|
|
register code_int hsize_reg; |
| 476 |
|
|
register int hshift; |
| 477 |
|
|
|
| 478 |
|
|
/* |
| 479 |
|
|
* Set up the globals: g_init_bits - initial number of bits |
| 480 |
|
|
* g_outfile - pointer to output file |
| 481 |
|
|
*/ |
| 482 |
|
|
g_init_bits = init_bits; |
| 483 |
|
|
g_outfile = outfile; |
| 484 |
|
|
/* |
| 485 |
|
|
* Set up the necessary values |
| 486 |
|
|
*/ |
| 487 |
|
|
offset = 0; |
| 488 |
|
|
out_count = 0; |
| 489 |
|
|
clear_flg = 0; |
| 490 |
|
|
in_count = 1; |
| 491 |
|
|
maxcode = MAXCODE(n_bits = g_init_bits); |
| 492 |
|
|
ClearCode = (1 << (init_bits - 1)); |
| 493 |
|
|
EOFCode = ClearCode + 1; |
| 494 |
|
|
free_ent = ClearCode + 2; |
| 495 |
|
|
char_init(); |
| 496 |
|
|
ent = GIFNextPixel( ReadValue ); |
| 497 |
|
|
hshift = 0; |
| 498 |
|
|
for ( fcode = (long) hsize; fcode < 65536L; fcode *= 2L ) |
| 499 |
|
|
hshift++; |
| 500 |
|
|
hshift = 8 - hshift; /* set hash code range bound */ |
| 501 |
|
|
hsize_reg = hsize; |
| 502 |
|
|
cl_hash( (count_int) hsize_reg); /* clear hash table */ |
| 503 |
|
|
output( (code_int)ClearCode ); |
| 504 |
|
|
while ( (c = GIFNextPixel( ReadValue )) != EOF ) { |
| 505 |
|
|
in_count++; |
| 506 |
|
|
fcode = (long) (((long) c << maxbits) + ent); |
| 507 |
|
|
/* i = (((code_int)c << hshift) ~ ent); /* xor hashing */ |
| 508 |
|
|
i = (((code_int)c << hshift) ^ ent); /* xor hashing */ |
| 509 |
|
|
if ( HashTabOf (i) == fcode ) { |
| 510 |
|
|
ent = CodeTabOf (i); |
| 511 |
|
|
continue; |
| 512 |
|
|
} else if ( (long)HashTabOf (i) < 0 ) /* empty slot */ |
| 513 |
|
|
goto nomatch; |
| 514 |
|
|
disp = hsize_reg - i; /* secondary hash (after G. Knott) */ |
| 515 |
|
|
if ( i == 0 ) |
| 516 |
|
|
disp = 1; |
| 517 |
|
|
probe: |
| 518 |
|
|
if ( (i -= disp) < 0 ) |
| 519 |
|
|
i += hsize_reg; |
| 520 |
|
|
if ( HashTabOf (i) == fcode ) { |
| 521 |
|
|
ent = CodeTabOf (i); |
| 522 |
|
|
continue; |
| 523 |
|
|
} |
| 524 |
|
|
if ( (long)HashTabOf (i) > 0 ) |
| 525 |
|
|
goto probe; |
| 526 |
|
|
nomatch: |
| 527 |
|
|
output ( (code_int) ent ); |
| 528 |
|
|
out_count++; |
| 529 |
|
|
ent = c; |
| 530 |
|
|
if ( free_ent < maxmaxcode ) { |
| 531 |
|
|
CodeTabOf (i) = free_ent++; /* code -> hashtable */ |
| 532 |
|
|
HashTabOf (i) = fcode; |
| 533 |
|
|
} else |
| 534 |
|
|
cl_block(); |
| 535 |
|
|
} |
| 536 |
|
|
/* |
| 537 |
|
|
* Put out the final code. |
| 538 |
|
|
*/ |
| 539 |
|
|
output( (code_int)ent ); |
| 540 |
|
|
out_count++; |
| 541 |
|
|
output( (code_int) EOFCode ); |
| 542 |
|
|
return; |
| 543 |
|
|
} |
| 544 |
|
|
|
| 545 |
|
|
/***************************************************************** |
| 546 |
|
|
* TAG( output ) |
| 547 |
|
|
* |
| 548 |
|
|
* Output the given code. |
| 549 |
|
|
* Inputs: |
| 550 |
|
|
* code: A n_bits-bit integer. If == -1, then EOF. This assumes |
| 551 |
|
|
* that n_bits =< (long)wordsize - 1. |
| 552 |
|
|
* Outputs: |
| 553 |
|
|
* Outputs code to the file. |
| 554 |
|
|
* Assumptions: |
| 555 |
|
|
* Chars are 8 bits long. |
| 556 |
|
|
* Algorithm: |
| 557 |
|
|
* Maintain a CBITS character long buffer (so that 8 codes will |
| 558 |
|
|
* fit in it exactly). Use the VAX insv instruction to insert each |
| 559 |
|
|
* code in turn. When the buffer fills up empty it and start over. |
| 560 |
|
|
*/ |
| 561 |
|
|
|
| 562 |
|
|
unsigned long masks[] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000F, |
| 563 |
|
|
0x001F, 0x003F, 0x007F, 0x00FF, |
| 564 |
|
|
0x01FF, 0x03FF, 0x07FF, 0x0FFF, |
| 565 |
|
|
0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF }; |
| 566 |
|
|
|
| 567 |
|
|
output( code ) |
| 568 |
|
|
code_int code; |
| 569 |
|
|
{ |
| 570 |
|
|
cur_accum &= masks[ cur_bits ]; |
| 571 |
|
|
if( cur_bits > 0 ) |
| 572 |
|
|
cur_accum |= ((long)code << cur_bits); |
| 573 |
|
|
else |
| 574 |
|
|
cur_accum = code; |
| 575 |
|
|
cur_bits += n_bits; |
| 576 |
|
|
while( cur_bits >= 8 ) { |
| 577 |
|
|
char_out( (unsigned int)(cur_accum & 0xff) ); |
| 578 |
|
|
cur_accum >>= 8; |
| 579 |
|
|
cur_bits -= 8; |
| 580 |
|
|
} |
| 581 |
|
|
|
| 582 |
|
|
/* |
| 583 |
|
|
* If the next entry is going to be too big for the code size, |
| 584 |
|
|
* then increase it, if possible. |
| 585 |
|
|
*/ |
| 586 |
|
|
if ( free_ent > maxcode || clear_flg ) { |
| 587 |
|
|
if( clear_flg ) { |
| 588 |
|
|
maxcode = MAXCODE (n_bits = g_init_bits); |
| 589 |
|
|
clear_flg = 0; |
| 590 |
|
|
} else { |
| 591 |
|
|
n_bits++; |
| 592 |
|
|
if ( n_bits == maxbits ) |
| 593 |
|
|
maxcode = maxmaxcode; |
| 594 |
|
|
else |
| 595 |
|
|
maxcode = MAXCODE(n_bits); |
| 596 |
|
|
} |
| 597 |
|
|
} |
| 598 |
|
|
if( code == EOFCode ) { |
| 599 |
|
|
/* |
| 600 |
|
|
* At EOF, write the rest of the buffer. |
| 601 |
|
|
*/ |
| 602 |
|
|
while( cur_bits > 0 ) { |
| 603 |
|
|
char_out( (unsigned int)(cur_accum & 0xff) ); |
| 604 |
|
|
cur_accum >>= 8; |
| 605 |
|
|
cur_bits -= 8; |
| 606 |
|
|
} |
| 607 |
|
|
flush_char(); |
| 608 |
|
|
fflush( g_outfile ); |
| 609 |
|
|
if( ferror( g_outfile ) ) |
| 610 |
|
|
writeerr(); |
| 611 |
|
|
} |
| 612 |
|
|
} |
| 613 |
|
|
|
| 614 |
|
|
/* |
| 615 |
|
|
* Clear out the hash table |
| 616 |
|
|
*/ |
| 617 |
|
|
cl_block () /* table clear for block compress */ |
| 618 |
|
|
{ |
| 619 |
|
|
cl_hash ( (count_int) hsize ); |
| 620 |
|
|
free_ent = ClearCode + 2; |
| 621 |
|
|
clear_flg = 1; |
| 622 |
|
|
output( (code_int)ClearCode ); |
| 623 |
|
|
} |
| 624 |
|
|
|
| 625 |
|
|
cl_hash(hsize) /* reset code table */ |
| 626 |
|
|
register count_int hsize; |
| 627 |
|
|
{ |
| 628 |
|
|
register count_int *htab_p = htab+hsize; |
| 629 |
|
|
register long i; |
| 630 |
|
|
register long m1 = -1; |
| 631 |
|
|
|
| 632 |
|
|
i = hsize - 16; |
| 633 |
|
|
do { /* might use Sys V memset(3) here */ |
| 634 |
|
|
*(htab_p-16) = m1; |
| 635 |
|
|
*(htab_p-15) = m1; |
| 636 |
|
|
*(htab_p-14) = m1; |
| 637 |
|
|
*(htab_p-13) = m1; |
| 638 |
|
|
*(htab_p-12) = m1; |
| 639 |
|
|
*(htab_p-11) = m1; |
| 640 |
|
|
*(htab_p-10) = m1; |
| 641 |
|
|
*(htab_p-9) = m1; |
| 642 |
|
|
*(htab_p-8) = m1; |
| 643 |
|
|
*(htab_p-7) = m1; |
| 644 |
|
|
*(htab_p-6) = m1; |
| 645 |
|
|
*(htab_p-5) = m1; |
| 646 |
|
|
*(htab_p-4) = m1; |
| 647 |
|
|
*(htab_p-3) = m1; |
| 648 |
|
|
*(htab_p-2) = m1; |
| 649 |
|
|
*(htab_p-1) = m1; |
| 650 |
|
|
htab_p -= 16; |
| 651 |
|
|
} while ((i -= 16) >= 0); |
| 652 |
|
|
for ( i += 16; i > 0; i-- ) |
| 653 |
|
|
*--htab_p = m1; |
| 654 |
|
|
} |
| 655 |
|
|
|
| 656 |
|
|
writeerr() |
| 657 |
|
|
{ |
| 658 |
|
|
printf( "error writing output file\n" ); |
| 659 |
|
|
exit(1); |
| 660 |
|
|
} |
| 661 |
|
|
|
| 662 |
|
|
/****************************************************************************** |
| 663 |
|
|
* |
| 664 |
|
|
* GIF Specific routines |
| 665 |
|
|
* |
| 666 |
|
|
******************************************************************************/ |
| 667 |
|
|
|
| 668 |
|
|
/* |
| 669 |
|
|
* Number of characters so far in this 'packet' |
| 670 |
|
|
*/ |
| 671 |
|
|
int a_count; |
| 672 |
|
|
|
| 673 |
|
|
/* |
| 674 |
|
|
* Set up the 'byte output' routine |
| 675 |
|
|
*/ |
| 676 |
|
|
char_init() |
| 677 |
|
|
{ |
| 678 |
|
|
a_count = 0; |
| 679 |
|
|
} |
| 680 |
|
|
|
| 681 |
|
|
/* |
| 682 |
|
|
* Define the storage for the packet accumulator |
| 683 |
|
|
*/ |
| 684 |
|
|
char accum[256]; |
| 685 |
|
|
|
| 686 |
|
|
/* |
| 687 |
|
|
* Add a character to the end of the current packet, and if it is 254 |
| 688 |
|
|
* characters, flush the packet to disk. |
| 689 |
|
|
*/ |
| 690 |
|
|
char_out( c ) |
| 691 |
|
|
int c; |
| 692 |
|
|
{ |
| 693 |
|
|
accum[ a_count++ ] = c; |
| 694 |
|
|
if( a_count >= 254 ) |
| 695 |
|
|
flush_char(); |
| 696 |
|
|
} |
| 697 |
|
|
|
| 698 |
|
|
/* |
| 699 |
|
|
* Flush the packet to disk, and reset the accumulator |
| 700 |
|
|
*/ |
| 701 |
|
|
flush_char() |
| 702 |
|
|
{ |
| 703 |
|
|
if( a_count > 0 ) { |
| 704 |
|
|
fputc( a_count, g_outfile ); |
| 705 |
|
|
fwrite( accum, 1, a_count, g_outfile ); |
| 706 |
|
|
a_count = 0; |
| 707 |
|
|
} |
| 708 |
|
|
} |
| 709 |
|
|
|
| 710 |
|
|
static float curgamma; |
| 711 |
|
|
static short gamtab[256]; |
| 712 |
|
|
|
| 713 |
|
|
gammawarp(sbuf,gam,n) |
| 714 |
|
|
short *sbuf; |
| 715 |
|
|
float gam; |
| 716 |
|
|
int n; |
| 717 |
|
|
{ |
| 718 |
|
|
int i; |
| 719 |
|
|
float f; |
| 720 |
|
|
|
| 721 |
|
|
if(gam!=curgamma) { |
| 722 |
|
|
for(i=0; i<256; i++) |
| 723 |
|
|
gamtab[i] = 255*pow(i/255.0,gam)+0.5; |
| 724 |
|
|
curgamma = gam; |
| 725 |
|
|
} |
| 726 |
|
|
while(n--) { |
| 727 |
|
|
*sbuf = gamtab[*sbuf]; |
| 728 |
|
|
sbuf++; |
| 729 |
|
|
} |
| 730 |
|
|
} |
