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)
extern char  *memcpy();
#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)

extern BYTE  clrtab[][3];

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];

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