src/px/ra_t8.c

/* Copyright (c) 1991 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  "pic.h"

#include  "targa.h"

#ifndef  BSD
#define  bcopy(s,d,n)           (void)memcpy(d,s,n)
extern char  *memcpy();
#endif
                        /* descriptor for a picture file or frame buffer */
typedef struct {
        char    *name;                  /* file name */
        FILE    *fp;                    /* file pointer */
        int     nexty;                  /* file positioning */
        int     bytes_line;             /* 0 == variable length lines */
        union {
                long    b;                      /* initial scanline */
                long    *y;                     /* individual scanline */
        } pos;                          /* position(s) */
} pic;

#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)    (pixel *)emalloc((h)->x*(h)->y*sizeof(pixel))

extern pic      *openinput();

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

extern long  ftell();

extern double  atof(), pow();

double  gamma = 2.0;                    /* gamma correction */

int  bradj = 0;                         /* brightness adjustment */

pic     *inpic;

char  *progname;

char  errmsg[128];

COLR    *inl;

pixel   *tarData;

int  xmax, ymax;


main(argc, argv)
int  argc;
char  *argv[];
{
        colormap  rasmap;
        struct hdStruct  head;
        int  dither = 1;
        int  reverse = 0;
        int  ncolors = 256;
        int  greyscale = 0;
        int  i;
        
        progname = argv[0];

        for (i = 1; i < argc; i++)
                if (argv[i][0] == '-')
                        switch (argv[i][1]) {
                        case 'd':
                                dither = !dither;
                                break;
                        case 'g':
                                gamma = 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;
                        default:
                                goto userr;
                        }
                else
                        break;

        if (reverse) {
                if (i < argc-2)
                        goto userr;
                if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
                        sprintf(errmsg, "can't open input \"%s\"", argv[i]);
                        quiterr(errmsg);
                }
                                        /* get header */
                if (getthead(&head, NULL, stdin) < 0)
                        quiterr("bad targa file");
                if (!goodpic(&head))
                        quiterr("incompatible format");
                xmax = head.x;
                ymax = head.y;
                                        /* open output file */
                if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
                        sprintf(errmsg, "can't open output \"%s\"", argv[i+1]);
                        quiterr(errmsg);
                }
                                        /* put header */
                printargs(i, argv, stdout);
                fputformat(COLRFMT, stdout);
                putchar('\n');
                fputresolu(YMAJOR|YDECR, xmax, ymax, stdout);
                                        /* convert file */
                tg2ra(&head);
        } else {
                if (i < argc-2 || (!greyscale && i > argc-1))
                        goto userr;
                if ((inpic = openinput(argv[i], &head)) == NULL) {
                        sprintf(errmsg, "can't open input \"%s\"", argv[i]);
                        quiterr(errmsg);
                }
                if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
                        sprintf(errmsg, "can't open output \"%s\"", argv[i+1]);
                        quiterr(errmsg);
                }
                                        /* write header */
                putthead(&head, NULL, stdout);
                                        /* convert file */
                if (greyscale)
                        biq(dither,ncolors,1,rasmap);
                else
                        ciq(dither,ncolors,1,rasmap);
                                        /* write data */
                writetarga(&head, tarData, stdout);
        }
        quiterr(NULL);
userr:
        fprintf(stderr,
        "Usage: %s [-d][-c ncolors][-b][-g gamma][-e +/-stops] input [output]\n",
                        progname);
        fprintf(stderr, "   Or: %s -r [-g gamma][-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);
}


pic *
openinput(fname, h)             /* open RADIANCE input file */
char  *fname;
register struct hdStruct  *h;
{
        register pic  *p;

        p = (pic *)emalloc(sizeof(pic));
        p->name = fname;
        if (fname == NULL)
                p->fp = stdin;
        else if ((p->fp = fopen(fname, "r")) == NULL)
                return(NULL);
                                        /* get header info. */
        if (checkheader(p->fp, COLRFMT, NULL) < 0 ||
                        fgetresolu(&xmax, &ymax, p->fp) != (YMAJOR|YDECR))
                quiterr("bad picture format");
        p->nexty = 0;
        p->bytes_line = 0;              /* variable length lines */
        p->pos.y = (long *)ecalloc(ymax, sizeof(long));
        p->pos.y[0] = ftell(p->fp);
                                        /* 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(p);
}


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,sizeof(map.c3),1,stdin) :
                        fread((char *)map.c4,sizeof(map.c4),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.,gamma),
                                        pow((map.c3[i][1]+.5)/256.,gamma),
                                        pow((map.c3[i][0]+.5)/256.,gamma));
                else
                        setcolr(ctab[i],
                                        pow((map.c4[i][3]+.5)/256.,gamma),
                                        pow((map.c4[i][2]+.5)/256.,gamma),
                                        pow((map.c4[i][1]+.5)/256.,gamma));
        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);
}


picreadline3(y, l3)                     /* read in 3-byte scanline */
int  y;
register rgbpixel  *l3;
{
        register int    i;

        if (inpic->nexty != y) {                        /* find scanline */
                if (inpic->bytes_line == 0) {
                        if (inpic->pos.y[y] == 0) {
                                while (inpic->nexty < y) {
                                        if (freadcolrs(inl, xmax, inpic->fp) < 0)
                                                quiterr("read error in picreadline3");
                                        inpic->pos.y[++inpic->nexty] = ftell(inpic->fp);
                                }
                        } else if (fseek(inpic->fp, inpic->pos.y[y], 0) == EOF)
                                quiterr("seek error in picreadline3");
                } else if (fseek(inpic->fp, y*inpic->bytes_line+inpic->pos.b, 0) == EOF)
                        quiterr("seek error in picreadline3");
        } else if (inpic->bytes_line == 0 && inpic->pos.y[inpic->nexty] == 0)
                inpic->pos.y[inpic->nexty] = ftell(inpic->fp);
        if (freadcolrs(inl, xmax, inpic->fp) < 0)       /* read scanline */
                quiterr("read error in picreadline3");
        inpic->nexty = y+1;
                                                        /* convert scanline */
        normcolrs(inl, xmax, bradj);
        for (i = 0; i < xmax; i++) {
                l3[i].r = inl[i][RED];
                l3[i].g = inl[i][GRN];
                l3[i].b = inl[i][BLU];
        }
}


picwriteline(y, l)                      /* save output scanline */
int  y;
pixel  *l;
{
        bcopy((char *)l, (char *)&tarData[(ymax-1-y)*xmax], xmax*sizeof(pixel));
}


writetarga(h, d, fp)            /* write out targa data */
struct hdStruct  *h;
pixel  *d;
FILE  *fp;
{
        if (h->dataType == IM_CMAP) {           /* uncompressed */
                if (fwrite((char *)d,h->x*sizeof(pixel),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;
pixel  *data;
FILE  *fp;
{
        register int  cnt, c;
        register pixel  *dp;

        if (h->dataType == IM_CMAP) {           /* uncompressed */
                if (fread((char *)data,h->x*sizeof(pixel),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");
}


picwritecm(cm)                  /* write out color map */
colormap  cm;
{
        register int  i, j;

        for (j = 0; j < 256; j++)
                for (i = 2; i >= 0; i--)
                        putc(cm[i][j], stdout);
}


picreadcm(map)                  /* do gamma correction if requested */
colormap  map;
{
        register int  i, val;

        for (i = 0; i < 256; i++) {
                val = pow((i+0.5)/256.0, 1.0/gamma) * 256.0;
                map[0][i] = map[1][i] = map[2][i] = val;
        }
}
Revision:	1.10
Committed:	Wed Aug 7 08:36:37 1991 UTC (32 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.9:	+14 -6 lines
Log Message:	added -e +/-stops option
#	User	Rev	Content
1	greg	1.10	/* Copyright (c) 1991 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			#include "pic.h"
19
20			#include "targa.h"
21
22	greg	1.4	#ifndef BSD
23			#define bcopy(s,d,n) (void)memcpy(d,s,n)
24			extern char *memcpy();
25			#endif
26	greg	1.1	/* descriptor for a picture file or frame buffer */
27			typedef struct {
28			char name; / file name */
29			FILE fp; / file pointer */
30			int nexty; /* file positioning */
31			int bytes_line; /* 0 == variable length lines */
32			union {
33			long b; /* initial scanline */
34			long y; / individual scanline */
35			} pos; /* position(s) */
36			} pic;
37
38			#define goodpic(h) (my_imType(h) && my_mapType(h))
39			#define my_imType(h) (((h)->dataType==IM_CMAP \|\| (h)->dataType==IM_CCMAP) \
40			&& (h)->dataBits==8 && (h)->imType==0)
41			#define my_mapType(h) ((h)->mapType==CM_HASMAP && \
42			((h)->CMapBits==24 \|\| (h)->CMapBits==32))
43
44			#define taralloc(h) (pixel )emalloc((h)->x(h)->y*sizeof(pixel))
45
46			extern pic *openinput();
47
48			extern char ecalloc(), emalloc();
49
50			extern long ftell();
51
52			extern double atof(), pow();
53
54			double gamma = 2.0; /* gamma correction */
55
56	greg	1.10	int bradj = 0; /* brightness adjustment */
57
58	greg	1.1	pic *inpic;
59
60			char *progname;
61
62			char errmsg[128];
63
64	greg	1.7	COLR *inl;
65	greg	1.1
66			pixel *tarData;
67
68			int xmax, ymax;
69
70
71			main(argc, argv)
72			int argc;
73			char *argv[];
74			{
75			colormap rasmap;
76			struct hdStruct head;
77			int dither = 1;
78			int reverse = 0;
79			int ncolors = 256;
80			int greyscale = 0;
81			int i;
82
83			progname = argv[0];
84
85			for (i = 1; i < argc; i++)
86			if (argv[i][0] == '-')
87			switch (argv[i][1]) {
88			case 'd':
89			dither = !dither;
90			break;
91			case 'g':
92			gamma = atof(argv[++i]);
93			break;
94			case 'r':
95			reverse = !reverse;
96			break;
97			case 'b':
98			greyscale = 1;
99			break;
100	greg	1.10	case 'e':
101			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
102			goto userr;
103			bradj = atoi(argv[++i]);
104			break;
105	greg	1.1	case 'c':
106			ncolors = atoi(argv[++i]);
107			break;
108			default:
109			goto userr;
110			}
111			else
112			break;
113
114			if (reverse) {
115			if (i < argc-2)
116			goto userr;
117			if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
118			sprintf(errmsg, "can't open input \"%s\"", argv[i]);
119			quiterr(errmsg);
120			}
121			/* get header */
122			if (getthead(&head, NULL, stdin) < 0)
123			quiterr("bad targa file");
124			if (!goodpic(&head))
125			quiterr("incompatible format");
126			xmax = head.x;
127			ymax = head.y;
128			/* open output file */
129			if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
130			sprintf(errmsg, "can't open output \"%s\"", argv[i+1]);
131			quiterr(errmsg);
132			}
133			/* put header */
134	greg	1.6	printargs(i, argv, stdout);
135	greg	1.9	fputformat(COLRFMT, stdout);
136	greg	1.1	putchar('\n');
137	greg	1.2	fputresolu(YMAJOR\|YDECR, xmax, ymax, stdout);
138	greg	1.1	/* convert file */
139			tg2ra(&head);
140			} else {
141	greg	1.10	if (i < argc-2 \|\| (!greyscale && i > argc-1))
142	greg	1.1	goto userr;
143			if ((inpic = openinput(argv[i], &head)) == NULL) {
144			sprintf(errmsg, "can't open input \"%s\"", argv[i]);
145			quiterr(errmsg);
146			}
147			if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
148			sprintf(errmsg, "can't open output \"%s\"", argv[i+1]);
149			quiterr(errmsg);
150			}
151			/* write header */
152			putthead(&head, NULL, stdout);
153			/* convert file */
154			if (greyscale)
155			biq(dither,ncolors,1,rasmap);
156			else
157			ciq(dither,ncolors,1,rasmap);
158			/* write data */
159			writetarga(&head, tarData, stdout);
160			}
161			quiterr(NULL);
162			userr:
163			fprintf(stderr,
164	greg	1.10	"Usage: %s [-d][-c ncolors][-b][-g gamma][-e +/-stops] input [output]\n",
165	greg	1.1	progname);
166	greg	1.10	fprintf(stderr, " Or: %s -r [-g gamma][-e +/-stops] [input [output]]\n",
167	greg	1.1	progname);
168			exit(1);
169			}
170
171
172			int
173			getint2(fp) /* get a 2-byte positive integer */
174			register FILE *fp;
175			{
176			register int b1, b2;
177
178			if ((b1 = getc(fp)) == EOF \|\| (b2 = getc(fp)) == EOF)
179			quiterr("read error");
180
181			return(b1 \| b2<<8);
182			}
183
184
185			putint2(i, fp) /* put a 2-byte positive integer */
186			register int i;
187			register FILE *fp;
188			{
189			putc(i&0xff, fp);
190			putc(i>>8&0xff, fp);
191			}
192
193
194			quiterr(err) /* print message and exit */
195			char *err;
196			{
197			if (err != NULL) {
198			fprintf(stderr, "%s: %s\n", progname, err);
199			exit(1);
200			}
201			exit(0);
202			}
203
204
205			eputs(s)
206			char *s;
207			{
208			fputs(s, stderr);
209			}
210
211
212			quit(code)
213			int code;
214			{
215			exit(code);
216			}
217
218
219			getthead(hp, ip, fp) /* read header from input */
220			struct hdStruct *hp;
221			char *ip;
222			register FILE *fp;
223			{
224			int nidbytes;
225
226			if ((nidbytes = getc(fp)) == EOF)
227			return(-1);
228			hp->mapType = getc(fp);
229			hp->dataType = getc(fp);
230			hp->mapOrig = getint2(fp);
231			hp->mapLength = getint2(fp);
232			hp->CMapBits = getc(fp);
233			hp->XOffset = getint2(fp);
234			hp->YOffset = getint2(fp);
235			hp->x = getint2(fp);
236			hp->y = getint2(fp);
237			hp->dataBits = getc(fp);
238			hp->imType = getc(fp);
239
240			if (ip != NULL)
241			if (nidbytes)
242	greg	1.4	fread((char *)ip, nidbytes, 1, fp);
243	greg	1.1	else
244			*ip = '\0';
245			else if (nidbytes)
246			fseek(fp, (long)nidbytes, 1);
247
248			return(feof(fp) \|\| ferror(fp) ? -1 : 0);
249			}
250
251
252			putthead(hp, ip, fp) /* write header to output */
253			struct hdStruct *hp;
254			char *ip;
255			register FILE *fp;
256			{
257			if (ip != NULL)
258			putc(strlen(ip), fp);
259			else
260			putc(0, fp);
261			putc(hp->mapType, fp);
262			putc(hp->dataType, fp);
263			putint2(hp->mapOrig, fp);
264			putint2(hp->mapLength, fp);
265			putc(hp->CMapBits, fp);
266			putint2(hp->XOffset, fp);
267			putint2(hp->YOffset, fp);
268			putint2(hp->x, fp);
269			putint2(hp->y, fp);
270			putc(hp->dataBits, fp);
271			putc(hp->imType, fp);
272
273			if (ip != NULL)
274			fputs(ip, fp);
275
276			return(ferror(fp) ? -1 : 0);
277			}
278
279
280			pic *
281			openinput(fname, h) /* open RADIANCE input file */
282			char *fname;
283			register struct hdStruct *h;
284			{
285			register pic *p;
286
287			p = (pic *)emalloc(sizeof(pic));
288			p->name = fname;
289			if (fname == NULL)
290			p->fp = stdin;
291			else if ((p->fp = fopen(fname, "r")) == NULL)
292			return(NULL);
293	greg	1.9	/* get header info. */
294			if (checkheader(p->fp, COLRFMT, NULL) < 0 \|\|
295			fgetresolu(&xmax, &ymax, p->fp) != (YMAJOR\|YDECR))
296			quiterr("bad picture format");
297	greg	1.1	p->nexty = 0;
298			p->bytes_line = 0; /* variable length lines */
299			p->pos.y = (long *)ecalloc(ymax, sizeof(long));
300			p->pos.y[0] = ftell(p->fp);
301			/* assign header */
302			h->textSize = 0;
303			h->mapType = CM_HASMAP;
304			h->dataType = IM_CMAP;
305			h->mapOrig = 0;
306			h->mapLength = 256;
307			h->CMapBits = 24;
308			h->XOffset = 0;
309			h->YOffset = 0;
310			h->x = xmax;
311			h->y = ymax;
312			h->dataBits = 8;
313			h->imType = 0;
314			/* allocate scanline */
315	greg	1.7	inl = (COLR )emalloc(xmaxsizeof(COLR));
316	greg	1.1	/* allocate targa data */
317			tarData = taralloc(h);
318
319			return(p);
320			}
321
322
323			tg2ra(hp) /* targa file to RADIANCE file */
324			struct hdStruct *hp;
325			{
326			union {
327			BYTE c3[256][3];
328			BYTE c4[256][4];
329			} map;
330			COLR ctab[256];
331			COLR *scanline;
332			register int i, j;
333
334			/* get color table */
335	greg	1.4	if ((hp->CMapBits==24 ? fread((char *)map.c3,sizeof(map.c3),1,stdin) :
336			fread((char *)map.c4,sizeof(map.c4),1,stdin)) != 1)
337	greg	1.1	quiterr("error reading color table");
338			/* convert table */
339			for (i = hp->mapOrig; i < hp->mapOrig+hp->mapLength; i++)
340			if (hp->CMapBits == 24)
341			setcolr(ctab[i],
342			pow((map.c3[i][2]+.5)/256.,gamma),
343			pow((map.c3[i][1]+.5)/256.,gamma),
344			pow((map.c3[i][0]+.5)/256.,gamma));
345			else
346			setcolr(ctab[i],
347			pow((map.c4[i][3]+.5)/256.,gamma),
348			pow((map.c4[i][2]+.5)/256.,gamma),
349			pow((map.c4[i][1]+.5)/256.,gamma));
350	greg	1.10	if (bradj)
351			shiftcolrs(ctab, 256, bradj);
352	greg	1.1	/* allocate targa data */
353			tarData = taralloc(hp);
354			/* get data */
355			readtarga(hp, tarData, stdin);
356			/* allocate input scanline */
357			scanline = (COLR )emalloc(xmaxsizeof(COLR));
358			/* convert file */
359			for (i = ymax-1; i >= 0; i--) {
360			for (j = 0; j < xmax; j++)
361			copycolr(scanline[j], ctab[tarData[i*xmax+j]]);
362			if (fwritecolrs(scanline, xmax, stdout) < 0)
363			quiterr("error writing RADIANCE file");
364			}
365			free((char *)scanline);
366			free((char *)tarData);
367			}
368
369
370			picreadline3(y, l3) /* read in 3-byte scanline */
371			int y;
372			register rgbpixel *l3;
373			{
374	greg	1.3	register int i;
375	greg	1.1
376	greg	1.3	if (inpic->nexty != y) { /* find scanline */
377	greg	1.1	if (inpic->bytes_line == 0) {
378			if (inpic->pos.y[y] == 0) {
379			while (inpic->nexty < y) {
380	greg	1.7	if (freadcolrs(inl, xmax, inpic->fp) < 0)
381	greg	1.1	quiterr("read error in picreadline3");
382			inpic->pos.y[++inpic->nexty] = ftell(inpic->fp);
383			}
384			} else if (fseek(inpic->fp, inpic->pos.y[y], 0) == EOF)
385			quiterr("seek error in picreadline3");
386			} else if (fseek(inpic->fp, y*inpic->bytes_line+inpic->pos.b, 0) == EOF)
387			quiterr("seek error in picreadline3");
388			} else if (inpic->bytes_line == 0 && inpic->pos.y[inpic->nexty] == 0)
389			inpic->pos.y[inpic->nexty] = ftell(inpic->fp);
390	greg	1.7	if (freadcolrs(inl, xmax, inpic->fp) < 0) /* read scanline */
391	greg	1.1	quiterr("read error in picreadline3");
392			inpic->nexty = y+1;
393			/* convert scanline */
394	greg	1.10	normcolrs(inl, xmax, bradj);
395	greg	1.3	for (i = 0; i < xmax; i++) {
396	greg	1.7	l3[i].r = inl[i][RED];
397			l3[i].g = inl[i][GRN];
398			l3[i].b = inl[i][BLU];
399	greg	1.1	}
400			}
401
402
403			picwriteline(y, l) /* save output scanline */
404			int y;
405			pixel *l;
406			{
407	greg	1.4	bcopy((char )l, (char )&tarData[(ymax-1-y)xmax], xmaxsizeof(pixel));
408	greg	1.1	}
409
410
411			writetarga(h, d, fp) /* write out targa data */
412			struct hdStruct *h;
413			pixel *d;
414			FILE *fp;
415			{
416			if (h->dataType == IM_CMAP) { /* uncompressed */
417	greg	1.4	if (fwrite((char )d,h->xsizeof(pixel),h->y,fp) != h->y)
418	greg	1.1	quiterr("error writing targa file");
419			return;
420			}
421			quiterr("unsupported output type");
422			}
423
424
425			readtarga(h, data, fp) /* read in targa data */
426			struct hdStruct *h;
427			pixel *data;
428			FILE *fp;
429			{
430			register int cnt, c;
431			register pixel *dp;
432
433			if (h->dataType == IM_CMAP) { /* uncompressed */
434	greg	1.4	if (fread((char )data,h->xsizeof(pixel),h->y,fp) != h->y)
435	greg	1.1	goto readerr;
436			return;
437			}
438			for (dp = data; dp < data+h->x*h->y; ) {
439			if ((c = getc(fp)) == EOF)
440			goto readerr;
441			cnt = (c & 0x7f) + 1;
442			if (c & 0x80) { /* repeated pixel */
443			if ((c = getc(fp)) == EOF)
444			goto readerr;
445			while (cnt--)
446			*dp++ = c;
447			} else /* non-repeating pixels */
448			while (cnt--) {
449			if ((c = getc(fp)) == EOF)
450			goto readerr;
451			*dp++ = c;
452			}
453			}
454			return;
455			readerr:
456			quiterr("error reading targa file");
457			}
458
459
460			picwritecm(cm) /* write out color map */
461			colormap cm;
462			{
463			register int i, j;
464
465			for (j = 0; j < 256; j++)
466			for (i = 2; i >= 0; i--)
467			putc(cm[i][j], stdout);
468			}
469
470
471			picreadcm(map) /* do gamma correction if requested */
472			colormap map;
473			{
474			register int i, val;
475
476			for (i = 0; i < 256; i++) {
477	greg	1.8	val = pow((i+0.5)/256.0, 1.0/gamma) * 256.0;
478	greg	1.1	map[0][i] = map[1][i] = map[2][i] = val;
479			}
480			}