src/px/ra_t8.c

/* Copyright (c) 1992 Regents of the University of California */

#ifndef lint
static char SCCSid[] = "$SunId$ LBL";
#endif

/*
 *  ra_t8.c - program to convert between RADIANCE and
 *              Targa 8-bit color-mapped images.
 *
 *      8/22/88         Adapted from ra_pr.c
 */

#include  <stdio.h>

#include  "color.h"

#include  "resolu.h"

#include  "targa.h"

#ifdef MSDOS
#include  <fcntl.h>
#endif

#include  <math.h>

#ifndef  BSD
#define  bcopy(s,d,n)           (void)memcpy(d,s,n)
#endif

#define  goodpic(h)     (my_imType(h) && my_mapType(h))
#define  my_imType(h)   (((h)->dataType==IM_CMAP || (h)->dataType==IM_CCMAP) \
                                && (h)->dataBits==8 && (h)->imType==0)
#define  my_mapType(h)  ((h)->mapType==CM_HASMAP && \
                                ((h)->CMapBits==24 || (h)->CMapBits==32))

#define  taralloc(h)    (BYTE *)emalloc((h)->x*(h)->y)

BYTE  clrtab[256][3];

extern int      samplefac;

extern char     *ecalloc(), *emalloc();

extern long  ftell();

double  gamv = 2.2;                     /* gamv correction */

int  bradj = 0;                         /* brightness adjustment */

char  *progname;

char  errmsg[128];

COLR    *inl;

BYTE    *tarData;

int  xmax, ymax;


main(argc, argv)
int  argc;
char  *argv[];
{
        struct hdStruct  head;
        int  dither = 1;
        int  reverse = 0;
        int  ncolors = 256;
        int  greyscale = 0;
        int  i;
#ifdef MSDOS
        extern int  _fmode;
        _fmode = O_BINARY;
        setmode(fileno(stdin), O_BINARY);
        setmode(fileno(stdout), O_BINARY);
#endif
        progname = argv[0];
        samplefac = 0;

        for (i = 1; i < argc; i++)
                if (argv[i][0] == '-')
                        switch (argv[i][1]) {
                        case 'd':
                                dither = !dither;
                                break;
                        case 'g':
                                gamv = atof(argv[++i]);
                                break;
                        case 'r':
                                reverse = !reverse;
                                break;
                        case 'b':
                                greyscale = 1;
                                break;
                        case 'e':
                                if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
                                        goto userr;
                                bradj = atoi(argv[++i]);
                                break;
                        case 'c':
                                ncolors = atoi(argv[++i]);
                                break;
                        case 'n':
                                samplefac = atoi(argv[++i]);
                                break;
                        default:
                                goto userr;
                        }
                else
                        break;

        if (i < argc-2)
                goto userr;
        if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
                sprintf(errmsg, "cannot open input \"%s\"", argv[i]);
                quiterr(errmsg);
        }
        if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
                sprintf(errmsg, "cannot open output \"%s\"", argv[i+1]);
                quiterr(errmsg);
        }
        if (reverse) {
                                        /* get header */
                if (getthead(&head, NULL, stdin) < 0)
                        quiterr("bad targa file");
                if (!goodpic(&head))
                        quiterr("incompatible format");
                xmax = head.x;
                ymax = head.y;
                                        /* put header */
                newheader("RADIANCE", stdout);
                printargs(i, argv, stdout);
                fputformat(COLRFMT, stdout);
                putchar('\n');
                fprtresolu(xmax, ymax, stdout);
                                        /* convert file */
                tg2ra(&head);
        } else {
                if (getrhead(&head, stdin) < 0)
                        quiterr("bad Radiance input");
                                        /* write header */
                putthead(&head, NULL, stdout);
                                        /* convert file */
                if (greyscale)
                        getgrey(ncolors);
                else
                        getmapped(ncolors, dither);
                                        /* write data */
                writetarga(&head, tarData, stdout);
        }
        quiterr(NULL);
userr:
        fprintf(stderr,
        "Usage: %s [-d][-n samp][-c ncolors][-b][-g gamv][-e +/-stops] input [output]\n",
                        progname);
        fprintf(stderr, "   Or: %s -r [-g gamv][-e +/-stops] [input [output]]\n",
                        progname);
        exit(1);
}


int
getint2(fp)                     /* get a 2-byte positive integer */
register FILE   *fp;
{
        register int  b1, b2;

        if ((b1 = getc(fp)) == EOF || (b2 = getc(fp)) == EOF)
                quiterr("read error");

        return(b1 | b2<<8);
}


putint2(i, fp)                  /* put a 2-byte positive integer */
register int  i;
register FILE   *fp;
{
        putc(i&0xff, fp);
        putc(i>>8&0xff, fp);
}


quiterr(err)            /* print message and exit */
char  *err;
{
        if (err != NULL) {
                fprintf(stderr, "%s: %s\n", progname, err);
                exit(1);
        }
        exit(0);
}


eputs(s)
char *s;
{
        fputs(s, stderr);
}


quit(code)
int code;
{
        exit(code);
}


getthead(hp, ip, fp)            /* read header from input */
struct hdStruct  *hp;
char  *ip;
register FILE  *fp;
{
        int     nidbytes;

        if ((nidbytes = getc(fp)) == EOF)
                return(-1);
        hp->mapType = getc(fp);
        hp->dataType = getc(fp);
        hp->mapOrig = getint2(fp);
        hp->mapLength = getint2(fp);
        hp->CMapBits = getc(fp);
        hp->XOffset = getint2(fp);
        hp->YOffset = getint2(fp);
        hp->x = getint2(fp);
        hp->y = getint2(fp);
        hp->dataBits = getc(fp);
        hp->imType = getc(fp);

        if (ip != NULL)
                if (nidbytes)
                        fread((char *)ip, nidbytes, 1, fp);
                else
                        *ip = '\0';
        else if (nidbytes)
                fseek(fp, (long)nidbytes, 1);

        return(feof(fp) || ferror(fp) ? -1 : 0);
}


putthead(hp, ip, fp)            /* write header to output */
struct hdStruct  *hp;
char  *ip;
register FILE  *fp;
{
        if (ip != NULL)
                putc(strlen(ip), fp);
        else
                putc(0, fp);
        putc(hp->mapType, fp);
        putc(hp->dataType, fp);
        putint2(hp->mapOrig, fp);
        putint2(hp->mapLength, fp);
        putc(hp->CMapBits, fp);
        putint2(hp->XOffset, fp);
        putint2(hp->YOffset, fp);
        putint2(hp->x, fp);
        putint2(hp->y, fp);
        putc(hp->dataBits, fp);
        putc(hp->imType, fp);

        if (ip != NULL)
                fputs(ip, fp);

        return(ferror(fp) ? -1 : 0);
}


getrhead(h, fp)                 /* load RADIANCE input file header */
register struct hdStruct  *h;
FILE  *fp;
{
                                        /* get header info. */
        if (checkheader(fp, COLRFMT, NULL) < 0 ||
                        fgetresolu(&xmax, &ymax, fp) < 0)
                return(-1);
                                        /* assign header */
        h->textSize = 0;
        h->mapType = CM_HASMAP;
        h->dataType = IM_CMAP;
        h->mapOrig = 0;
        h->mapLength = 256;
        h->CMapBits = 24;
        h->XOffset = 0;
        h->YOffset = 0;
        h->x = xmax;
        h->y = ymax;
        h->dataBits = 8;
        h->imType = 0;
                                        /* allocate scanline */
        inl = (COLR *)emalloc(xmax*sizeof(COLR));
                                        /* allocate targa data */
        tarData = taralloc(h);

        return(0);
}


tg2ra(hp)                       /* targa file to RADIANCE file */
struct hdStruct  *hp;
{
        union {
                BYTE  c3[256][3];
                BYTE  c4[256][4];
        } map;
        COLR  ctab[256];
        COLR  *scanline;
        register int  i, j;

                                        /* get color table */
        if ((hp->CMapBits==24 ? fread((char *)(map.c3+hp->mapOrig),
                                3*hp->mapLength,1,stdin) :
                        fread((char *)(map.c4+hp->mapOrig),
                                4*hp->mapLength,1,stdin)) != 1)
                quiterr("error reading color table");
                                        /* convert table */
        for (i = hp->mapOrig; i < hp->mapOrig+hp->mapLength; i++)
                if (hp->CMapBits == 24)
                        setcolr(ctab[i],
                                        pow((map.c3[i][2]+.5)/256.,gamv),
                                        pow((map.c3[i][1]+.5)/256.,gamv),
                                        pow((map.c3[i][0]+.5)/256.,gamv));
                else
                        setcolr(ctab[i],
                                        pow((map.c4[i][3]+.5)/256.,gamv),
                                        pow((map.c4[i][2]+.5)/256.,gamv),
                                        pow((map.c4[i][1]+.5)/256.,gamv));
        if (bradj)
                shiftcolrs(ctab, 256, bradj);
                                        /* allocate targa data */
        tarData = taralloc(hp);
                                        /* get data */
        readtarga(hp, tarData, stdin);
                                        /* allocate input scanline */
        scanline = (COLR *)emalloc(xmax*sizeof(COLR));
                                        /* convert file */
        for (i = ymax-1; i >= 0; i--) {
                for (j = 0; j < xmax; j++)
                        copycolr(scanline[j], ctab[tarData[i*xmax+j]]);
                if (fwritecolrs(scanline, xmax, stdout) < 0)
                        quiterr("error writing RADIANCE file");
        }
        free((char *)scanline);
        free((char *)tarData);
}


getmapped(nc, dith)             /* read in and quantize image */
int  nc;                /* number of colors to use */
int  dith;              /* use dithering? */
{
        long  fpos;
        register int  y;

        setcolrgam(gamv);
        fpos = ftell(stdin);
        if ((samplefac ? neu_init(xmax*ymax) : new_histo(xmax*ymax)) == -1)
                quiterr("cannot initialized histogram");
        for (y = ymax-1; y >= 0; y--) {
                if (freadcolrs(inl, xmax, stdin) < 0)
                        quiterr("error reading Radiance input");
                if (bradj)
                        shiftcolrs(inl, xmax, bradj);
                colrs_gambs(inl, xmax);
                if (samplefac)
                        neu_colrs(inl, xmax);
                else
                        cnt_colrs(inl, xmax);
        }
        if (fseek(stdin, fpos, 0) == EOF)
                quiterr("Radiance input must be from a file");
        if (samplefac)                  /* map colors */
                neu_clrtab(nc);
        else
                new_clrtab(nc);
        for (y = ymax-1; y >= 0; y--) {
                if (freadcolrs(inl, xmax, stdin) < 0)
                        quiterr("error reading Radiance input");
                if (bradj)
                        shiftcolrs(inl, xmax, bradj);
                colrs_gambs(inl, xmax);
                if (samplefac)
                        if (dith)
                                neu_dith_colrs(tarData+y*xmax, inl, xmax);
                        else
                                neu_map_colrs(tarData+y*xmax, inl, xmax);
                else
                        if (dith)
                                dith_colrs(tarData+y*xmax, inl, xmax);
                        else
                                map_colrs(tarData+y*xmax, inl, xmax);
        }
}


getgrey(nc)                     /* read in and convert to greyscale image */
int  nc;                /* number of colors to use */
{
        int  y;
        register BYTE  *dp;
        register int  x;

        setcolrgam(gamv);
        dp = tarData+xmax*ymax;;
        for (y = ymax-1; y >= 0; y--) {
                if (freadcolrs(inl, xmax, stdin) < 0)
                        quiterr("error reading Radiance input");
                if (bradj)
                        shiftcolrs(inl, xmax, bradj);
                x = xmax;
                while (x--)
                        inl[x][GRN] = normbright(inl[x]);
                colrs_gambs(inl, xmax);
                x = xmax;
                if (nc < 256)
                        while (x--)
                                *--dp = ((long)inl[x][GRN]*nc+nc/2)>>8;
                else
                        while (x--)
                                *--dp = inl[x][GRN];
        }
        for (x = 0; x < nc; x++)
                clrtab[x][RED] = clrtab[x][GRN] =
                        clrtab[x][BLU] = ((long)x*256+128)/nc;
}


writetarga(h, d, fp)            /* write out targa data */
struct hdStruct  *h;
BYTE  *d;
FILE  *fp;
{
        register int  i, j;

        for (i = 0; i < h->mapLength; i++)      /* write color map */
                for (j = 2; j >= 0; j--)
                        putc(clrtab[i][j], fp);
        if (h->dataType == IM_CMAP) {           /* uncompressed */
                if (fwrite((char *)d,h->x*sizeof(BYTE),h->y,fp) != h->y)
                        quiterr("error writing targa file");
                return;
        }
        quiterr("unsupported output type");
}


readtarga(h, data, fp)          /* read in targa data */
struct hdStruct  *h;
BYTE  *data;
FILE  *fp;
{
        register int  cnt, c;
        register BYTE   *dp;

        if (h->dataType == IM_CMAP) {           /* uncompressed */
                if (fread((char *)data,h->x*sizeof(BYTE),h->y,fp) != h->y)
                        goto readerr;
                return;
        }
        for (dp = data; dp < data+h->x*h->y; ) {
                if ((c = getc(fp)) == EOF)
                        goto readerr;
                cnt = (c & 0x7f) + 1;
                if (c & 0x80) {                 /* repeated pixel */
                        if ((c = getc(fp)) == EOF)
                                goto readerr;
                        while (cnt--)
                                *dp++ = c;
                } else                          /* non-repeating pixels */
                        while (cnt--) {
                                if ((c = getc(fp)) == EOF)
                                        goto readerr;
                                *dp++ = c;
                        }
        }
        return;
readerr:
        quiterr("error reading targa file");
}
Revision:	2.9
Committed:	Fri Nov 10 17:04:52 1995 UTC (28 years, 5 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.8:	+0 -1 lines
Log Message:	removed memcpy() declaration
#	User	Rev	Content
1	greg	2.3	/* Copyright (c) 1992 Regents of the University of California */
2	greg	1.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ LBL";
5			#endif
6
7			/*
8			* ra_t8.c - program to convert between RADIANCE and
9			* Targa 8-bit color-mapped images.
10			*
11			* 8/22/88 Adapted from ra_pr.c
12			*/
13
14			#include <stdio.h>
15
16			#include "color.h"
17
18	greg	1.12	#include "resolu.h"
19
20	greg	1.1	#include "targa.h"
21
22	greg	2.3	#ifdef MSDOS
23			#include <fcntl.h>
24			#endif
25
26			#include <math.h>
27
28			#ifndef BSD
29			#define bcopy(s,d,n) (void)memcpy(d,s,n)
30	greg	1.4	#endif
31	greg	1.1
32	greg	2.3	#define goodpic(h) (my_imType(h) && my_mapType(h))
33			#define my_imType(h) (((h)->dataType==IM_CMAP \|\| (h)->dataType==IM_CCMAP) \
34	greg	1.1	&& (h)->dataBits==8 && (h)->imType==0)
35	greg	2.3	#define my_mapType(h) ((h)->mapType==CM_HASMAP && \
36	greg	1.1	((h)->CMapBits==24 \|\| (h)->CMapBits==32))
37
38	greg	2.4	#define taralloc(h) (BYTE )emalloc((h)->x(h)->y)
39	greg	1.1
40	greg	2.7	BYTE clrtab[256][3];
41	greg	1.1
42	greg	2.7	extern int samplefac;
43
44	greg	1.1	extern char ecalloc(), emalloc();
45
46			extern long ftell();
47
48	greg	2.4	double gamv = 2.2; /* gamv correction */
49	greg	1.1
50	greg	1.10	int bradj = 0; /* brightness adjustment */
51
52	greg	1.1	char *progname;
53
54			char errmsg[128];
55
56	greg	1.7	COLR *inl;
57	greg	1.1
58	greg	2.4	BYTE *tarData;
59	greg	1.1
60			int xmax, ymax;
61
62
63			main(argc, argv)
64			int argc;
65			char *argv[];
66			{
67	greg	2.3	struct hdStruct head;
68	greg	1.1	int dither = 1;
69			int reverse = 0;
70			int ncolors = 256;
71			int greyscale = 0;
72			int i;
73	greg	2.3	#ifdef MSDOS
74			extern int _fmode;
75			_fmode = O_BINARY;
76			setmode(fileno(stdin), O_BINARY);
77			setmode(fileno(stdout), O_BINARY);
78			#endif
79	greg	1.1	progname = argv[0];
80	greg	2.7	samplefac = 0;
81	greg	1.1
82			for (i = 1; i < argc; i++)
83			if (argv[i][0] == '-')
84			switch (argv[i][1]) {
85			case 'd':
86			dither = !dither;
87			break;
88			case 'g':
89	greg	2.4	gamv = atof(argv[++i]);
90	greg	1.1	break;
91			case 'r':
92			reverse = !reverse;
93			break;
94			case 'b':
95			greyscale = 1;
96			break;
97	greg	1.10	case 'e':
98			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
99			goto userr;
100			bradj = atoi(argv[++i]);
101			break;
102	greg	1.1	case 'c':
103			ncolors = atoi(argv[++i]);
104			break;
105	greg	2.7	case 'n':
106			samplefac = atoi(argv[++i]);
107			break;
108	greg	1.1	default:
109			goto userr;
110			}
111			else
112			break;
113
114	greg	2.4	if (i < argc-2)
115			goto userr;
116			if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
117			sprintf(errmsg, "cannot open input \"%s\"", argv[i]);
118			quiterr(errmsg);
119			}
120			if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
121			sprintf(errmsg, "cannot open output \"%s\"", argv[i+1]);
122			quiterr(errmsg);
123			}
124	greg	1.1	if (reverse) {
125			/* get header */
126			if (getthead(&head, NULL, stdin) < 0)
127			quiterr("bad targa file");
128			if (!goodpic(&head))
129			quiterr("incompatible format");
130			xmax = head.x;
131			ymax = head.y;
132			/* put header */
133	greg	2.6	newheader("RADIANCE", stdout);
134	greg	1.6	printargs(i, argv, stdout);
135	greg	1.9	fputformat(COLRFMT, stdout);
136	greg	1.1	putchar('\n');
137	greg	1.12	fprtresolu(xmax, ymax, stdout);
138	greg	1.1	/* convert file */
139			tg2ra(&head);
140			} else {
141	greg	2.4	if (getrhead(&head, stdin) < 0)
142			quiterr("bad Radiance input");
143	greg	1.1	/* write header */
144			putthead(&head, NULL, stdout);
145			/* convert file */
146			if (greyscale)
147	greg	2.4	getgrey(ncolors);
148	greg	1.1	else
149	greg	2.4	getmapped(ncolors, dither);
150	greg	1.1	/* write data */
151			writetarga(&head, tarData, stdout);
152			}
153			quiterr(NULL);
154			userr:
155			fprintf(stderr,
156	greg	2.8	"Usage: %s [-d][-n samp][-c ncolors][-b][-g gamv][-e +/-stops] input [output]\n",
157	greg	1.1	progname);
158	greg	2.4	fprintf(stderr, " Or: %s -r [-g gamv][-e +/-stops] [input [output]]\n",
159	greg	1.1	progname);
160			exit(1);
161			}
162
163
164			int
165			getint2(fp) /* get a 2-byte positive integer */
166			register FILE *fp;
167			{
168			register int b1, b2;
169
170			if ((b1 = getc(fp)) == EOF \|\| (b2 = getc(fp)) == EOF)
171			quiterr("read error");
172
173			return(b1 \| b2<<8);
174			}
175
176
177			putint2(i, fp) /* put a 2-byte positive integer */
178			register int i;
179			register FILE *fp;
180			{
181			putc(i&0xff, fp);
182			putc(i>>8&0xff, fp);
183			}
184
185
186			quiterr(err) /* print message and exit */
187			char *err;
188			{
189			if (err != NULL) {
190			fprintf(stderr, "%s: %s\n", progname, err);
191			exit(1);
192			}
193			exit(0);
194			}
195
196
197			eputs(s)
198			char *s;
199			{
200			fputs(s, stderr);
201			}
202
203
204			quit(code)
205			int code;
206			{
207			exit(code);
208			}
209
210
211			getthead(hp, ip, fp) /* read header from input */
212	greg	2.3	struct hdStruct *hp;
213	greg	1.1	char *ip;
214			register FILE *fp;
215			{
216			int nidbytes;
217
218			if ((nidbytes = getc(fp)) == EOF)
219			return(-1);
220			hp->mapType = getc(fp);
221			hp->dataType = getc(fp);
222			hp->mapOrig = getint2(fp);
223			hp->mapLength = getint2(fp);
224			hp->CMapBits = getc(fp);
225			hp->XOffset = getint2(fp);
226			hp->YOffset = getint2(fp);
227			hp->x = getint2(fp);
228			hp->y = getint2(fp);
229			hp->dataBits = getc(fp);
230			hp->imType = getc(fp);
231
232			if (ip != NULL)
233			if (nidbytes)
234	greg	1.4	fread((char *)ip, nidbytes, 1, fp);
235	greg	1.1	else
236			*ip = '\0';
237			else if (nidbytes)
238			fseek(fp, (long)nidbytes, 1);
239
240			return(feof(fp) \|\| ferror(fp) ? -1 : 0);
241			}
242
243
244			putthead(hp, ip, fp) /* write header to output */
245	greg	2.3	struct hdStruct *hp;
246	greg	1.1	char *ip;
247			register FILE *fp;
248			{
249			if (ip != NULL)
250			putc(strlen(ip), fp);
251			else
252			putc(0, fp);
253			putc(hp->mapType, fp);
254			putc(hp->dataType, fp);
255			putint2(hp->mapOrig, fp);
256			putint2(hp->mapLength, fp);
257			putc(hp->CMapBits, fp);
258			putint2(hp->XOffset, fp);
259			putint2(hp->YOffset, fp);
260			putint2(hp->x, fp);
261			putint2(hp->y, fp);
262			putc(hp->dataBits, fp);
263			putc(hp->imType, fp);
264
265			if (ip != NULL)
266			fputs(ip, fp);
267
268			return(ferror(fp) ? -1 : 0);
269			}
270
271
272	greg	2.4	getrhead(h, fp) /* load RADIANCE input file header */
273	greg	1.1	register struct hdStruct *h;
274	greg	2.4	FILE *fp;
275	greg	1.1	{
276	greg	1.9	/* get header info. */
277	greg	2.4	if (checkheader(fp, COLRFMT, NULL) < 0 \|\|
278			fgetresolu(&xmax, &ymax, fp) < 0)
279			return(-1);
280	greg	1.1	/* assign header */
281			h->textSize = 0;
282			h->mapType = CM_HASMAP;
283			h->dataType = IM_CMAP;
284			h->mapOrig = 0;
285			h->mapLength = 256;
286			h->CMapBits = 24;
287			h->XOffset = 0;
288			h->YOffset = 0;
289			h->x = xmax;
290			h->y = ymax;
291			h->dataBits = 8;
292			h->imType = 0;
293			/* allocate scanline */
294	greg	1.7	inl = (COLR )emalloc(xmaxsizeof(COLR));
295	greg	1.1	/* allocate targa data */
296			tarData = taralloc(h);
297
298	greg	2.4	return(0);
299	greg	1.1	}
300
301
302			tg2ra(hp) /* targa file to RADIANCE file */
303	greg	2.3	struct hdStruct *hp;
304	greg	1.1	{
305			union {
306			BYTE c3[256][3];
307			BYTE c4[256][4];
308			} map;
309			COLR ctab[256];
310			COLR *scanline;
311			register int i, j;
312
313			/* get color table */
314	greg	1.12	if ((hp->CMapBits==24 ? fread((char *)(map.c3+hp->mapOrig),
315			3*hp->mapLength,1,stdin) :
316			fread((char *)(map.c4+hp->mapOrig),
317			4*hp->mapLength,1,stdin)) != 1)
318	greg	1.1	quiterr("error reading color table");
319			/* convert table */
320			for (i = hp->mapOrig; i < hp->mapOrig+hp->mapLength; i++)
321			if (hp->CMapBits == 24)
322			setcolr(ctab[i],
323	greg	2.4	pow((map.c3[i][2]+.5)/256.,gamv),
324			pow((map.c3[i][1]+.5)/256.,gamv),
325			pow((map.c3[i][0]+.5)/256.,gamv));
326	greg	1.1	else
327			setcolr(ctab[i],
328	greg	2.4	pow((map.c4[i][3]+.5)/256.,gamv),
329			pow((map.c4[i][2]+.5)/256.,gamv),
330			pow((map.c4[i][1]+.5)/256.,gamv));
331	greg	1.10	if (bradj)
332			shiftcolrs(ctab, 256, bradj);
333	greg	1.1	/* allocate targa data */
334			tarData = taralloc(hp);
335			/* get data */
336			readtarga(hp, tarData, stdin);
337			/* allocate input scanline */
338			scanline = (COLR )emalloc(xmaxsizeof(COLR));
339			/* convert file */
340			for (i = ymax-1; i >= 0; i--) {
341			for (j = 0; j < xmax; j++)
342			copycolr(scanline[j], ctab[tarData[i*xmax+j]]);
343			if (fwritecolrs(scanline, xmax, stdout) < 0)
344			quiterr("error writing RADIANCE file");
345			}
346			free((char *)scanline);
347			free((char *)tarData);
348			}
349
350
351	greg	2.4	getmapped(nc, dith) /* read in and quantize image */
352			int nc; /* number of colors to use */
353			int dith; /* use dithering? */
354	greg	1.1	{
355	greg	2.4	long fpos;
356			register int y;
357	greg	1.1
358	greg	2.4	setcolrgam(gamv);
359			fpos = ftell(stdin);
360	greg	2.7	if ((samplefac ? neu_init(xmaxymax) : new_histo(xmaxymax)) == -1)
361			quiterr("cannot initialized histogram");
362	greg	2.4	for (y = ymax-1; y >= 0; y--) {
363			if (freadcolrs(inl, xmax, stdin) < 0)
364			quiterr("error reading Radiance input");
365			if (bradj)
366			shiftcolrs(inl, xmax, bradj);
367			colrs_gambs(inl, xmax);
368	greg	2.7	if (samplefac)
369			neu_colrs(inl, xmax);
370			else
371			cnt_colrs(inl, xmax);
372	greg	1.1	}
373	greg	2.4	if (fseek(stdin, fpos, 0) == EOF)
374			quiterr("Radiance input must be from a file");
375	greg	2.7	if (samplefac) /* map colors */
376			neu_clrtab(nc);
377			else
378			new_clrtab(nc);
379	greg	2.4	for (y = ymax-1; y >= 0; y--) {
380			if (freadcolrs(inl, xmax, stdin) < 0)
381			quiterr("error reading Radiance input");
382			if (bradj)
383			shiftcolrs(inl, xmax, bradj);
384			colrs_gambs(inl, xmax);
385	greg	2.7	if (samplefac)
386			if (dith)
387			neu_dith_colrs(tarData+y*xmax, inl, xmax);
388			else
389			neu_map_colrs(tarData+y*xmax, inl, xmax);
390	greg	2.4	else
391	greg	2.7	if (dith)
392			dith_colrs(tarData+y*xmax, inl, xmax);
393			else
394			map_colrs(tarData+y*xmax, inl, xmax);
395	greg	2.4	}
396	greg	1.1	}
397
398
399	greg	2.4	getgrey(nc) /* read in and convert to greyscale image */
400			int nc; /* number of colors to use */
401	greg	1.1	{
402	greg	2.4	int y;
403			register BYTE *dp;
404			register int x;
405
406			setcolrgam(gamv);
407			dp = tarData+xmax*ymax;;
408			for (y = ymax-1; y >= 0; y--) {
409			if (freadcolrs(inl, xmax, stdin) < 0)
410			quiterr("error reading Radiance input");
411			if (bradj)
412			shiftcolrs(inl, xmax, bradj);
413	greg	2.5	x = xmax;
414			while (x--)
415			inl[x][GRN] = normbright(inl[x]);
416	greg	2.4	colrs_gambs(inl, xmax);
417			x = xmax;
418			if (nc < 256)
419			while (x--)
420	greg	2.5	--dp = ((long)inl[x][GRN]nc+nc/2)>>8;
421	greg	2.4	else
422			while (x--)
423	greg	2.5	*--dp = inl[x][GRN];
424	greg	2.4	}
425			for (x = 0; x < nc; x++)
426			clrtab[x][RED] = clrtab[x][GRN] =
427	greg	2.5	clrtab[x][BLU] = ((long)x*256+128)/nc;
428	greg	1.1	}
429
430
431			writetarga(h, d, fp) /* write out targa data */
432	greg	2.3	struct hdStruct *h;
433	greg	2.4	BYTE *d;
434	greg	1.1	FILE *fp;
435			{
436	greg	2.4	register int i, j;
437
438			for (i = 0; i < h->mapLength; i++) /* write color map */
439			for (j = 2; j >= 0; j--)
440			putc(clrtab[i][j], fp);
441	greg	1.1	if (h->dataType == IM_CMAP) { /* uncompressed */
442	greg	2.4	if (fwrite((char )d,h->xsizeof(BYTE),h->y,fp) != h->y)
443	greg	1.1	quiterr("error writing targa file");
444			return;
445			}
446			quiterr("unsupported output type");
447			}
448
449
450			readtarga(h, data, fp) /* read in targa data */
451	greg	2.3	struct hdStruct *h;
452	greg	2.4	BYTE *data;
453	greg	1.1	FILE *fp;
454			{
455			register int cnt, c;
456	greg	2.4	register BYTE *dp;
457	greg	1.1
458			if (h->dataType == IM_CMAP) { /* uncompressed */
459	greg	2.4	if (fread((char )data,h->xsizeof(BYTE),h->y,fp) != h->y)
460	greg	1.1	goto readerr;
461			return;
462			}
463			for (dp = data; dp < data+h->x*h->y; ) {
464			if ((c = getc(fp)) == EOF)
465			goto readerr;
466			cnt = (c & 0x7f) + 1;
467			if (c & 0x80) { /* repeated pixel */
468			if ((c = getc(fp)) == EOF)
469			goto readerr;
470			while (cnt--)
471			*dp++ = c;
472			} else /* non-repeating pixels */
473			while (cnt--) {
474			if ((c = getc(fp)) == EOF)
475			goto readerr;
476			*dp++ = c;
477			}
478			}
479			return;
480			readerr:
481			quiterr("error reading targa file");
482			}