src/px/ra_t8.c

#ifndef lint
static const char       RCSid[] = "$Id: ra_t8.c,v 2.12 2003/06/05 19:29:34 schorsch Exp $";
#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  <string.h>
#include  <time.h>
#include  <math.h>

#include  "platform.h"
#include  "rtmisc.h"
#include  "color.h"
#include  "resolu.h"
#include  "clrtab.h"
#include  "targa.h"


#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;
double  gamv = 2.2;                     /* gamv correction */
int  bradj = 0;                         /* brightness adjustment */
char  *progname;
char  errmsg[128];
COLR    *inl;
BYTE    *tarData;
int  xmax, ymax;

static int getint2(FILE *fp);
static void putint2(int  i, FILE        *fp);
static void quiterr(char  *err);
static int getthead(struct hdStruct      *hp, char  *ip, FILE  *fp);
static int putthead(struct hdStruct      *hp, char  *ip, FILE  *fp);
static int getrhead(struct hdStruct  *h, FILE  *fp);
static void tg2ra(struct hdStruct        *hp);
static void getmapped(int  nc, int  dith);
static void getgrey(int  nc);
static void writetarga(struct hdStruct   *h, BYTE  *d, FILE  *fp);
static void readtarga(struct hdStruct    *h, BYTE  *data, FILE  *fp);


int
main(
        int  argc,
        char  *argv[]
)
{
        struct hdStruct  head;
        int  dither = 1;
        int  reverse = 0;
        int  ncolors = 256;
        int  greyscale = 0;
        int  i;
        SET_DEFAULT_BINARY();
        SET_FILE_BINARY(stdin);
        SET_FILE_BINARY(stdout);
        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);
}


static int
getint2(                        /* 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);
}


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


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


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


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


static int
getthead(               /* 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);
}


static int
putthead(               /* 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);
}


static int
getrhead(                       /* 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);
}


static void
tg2ra(                  /* 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((void *)scanline);
        free((void *)tarData);
}


static void
getmapped(              /* 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);
        }
}


static void
getgrey(                        /* 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;
}


static void
writetarga(             /* 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");
}


static void
readtarga(              /* 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:	2.13
Committed:	Sun Mar 28 20:33:14 2004 UTC (20 years, 1 month ago) by schorsch
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R7P2, rad3R7P1, rad4R0, rad3R6, rad3R6P1, rad3R8, rad3R9
Changes since 2.12:	+76 -50 lines
Log Message:	Continued ANSIfication, and other fixes and clarifications.
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	schorsch	2.13	static const char RCSid[] = "$Id: ra_t8.c,v 2.12 2003/06/05 19:29:34 schorsch Exp $";
3	greg	1.1	#endif
4			/*
5			* ra_t8.c - program to convert between RADIANCE and
6			* Targa 8-bit color-mapped images.
7			*
8			* 8/22/88 Adapted from ra_pr.c
9			*/
10
11			#include <stdio.h>
12	schorsch	2.13	#include <string.h>
13	greg	2.10	#include <time.h>
14	schorsch	2.12	#include <math.h>
15	greg	2.10
16	schorsch	2.12	#include "platform.h"
17	schorsch	2.13	#include "rtmisc.h"
18	greg	1.1	#include "color.h"
19	greg	1.12	#include "resolu.h"
20	schorsch	2.13	#include "clrtab.h"
21	greg	1.1	#include "targa.h"
22
23
24	greg	2.3	#define goodpic(h) (my_imType(h) && my_mapType(h))
25			#define my_imType(h) (((h)->dataType==IM_CMAP \|\| (h)->dataType==IM_CCMAP) \
26	greg	1.1	&& (h)->dataBits==8 && (h)->imType==0)
27	greg	2.3	#define my_mapType(h) ((h)->mapType==CM_HASMAP && \
28	greg	1.1	((h)->CMapBits==24 \|\| (h)->CMapBits==32))
29
30	greg	2.4	#define taralloc(h) (BYTE )emalloc((h)->x(h)->y)
31	greg	1.1
32	greg	2.7	BYTE clrtab[256][3];
33			extern int samplefac;
34	greg	2.4	double gamv = 2.2; /* gamv correction */
35	greg	1.10	int bradj = 0; /* brightness adjustment */
36	greg	1.1	char *progname;
37			char errmsg[128];
38	greg	1.7	COLR *inl;
39	greg	2.4	BYTE *tarData;
40	schorsch	2.13	int xmax, ymax;
41	greg	1.1
42	schorsch	2.13	static int getint2(FILE *fp);
43			static void putint2(int i, FILE *fp);
44			static void quiterr(char *err);
45			static int getthead(struct hdStruct hp, char ip, FILE *fp);
46			static int putthead(struct hdStruct hp, char ip, FILE *fp);
47			static int getrhead(struct hdStruct h, FILE fp);
48			static void tg2ra(struct hdStruct *hp);
49			static void getmapped(int nc, int dith);
50			static void getgrey(int nc);
51			static void writetarga(struct hdStruct h, BYTE d, FILE *fp);
52			static void readtarga(struct hdStruct h, BYTE data, FILE *fp);
53	greg	1.1
54
55	schorsch	2.13	int
56			main(
57			int argc,
58			char *argv[]
59			)
60	greg	1.1	{
61	greg	2.3	struct hdStruct head;
62	greg	1.1	int dither = 1;
63			int reverse = 0;
64			int ncolors = 256;
65			int greyscale = 0;
66			int i;
67	schorsch	2.12	SET_DEFAULT_BINARY();
68			SET_FILE_BINARY(stdin);
69			SET_FILE_BINARY(stdout);
70	greg	1.1	progname = argv[0];
71	greg	2.7	samplefac = 0;
72	greg	1.1
73			for (i = 1; i < argc; i++)
74			if (argv[i][0] == '-')
75			switch (argv[i][1]) {
76			case 'd':
77			dither = !dither;
78			break;
79			case 'g':
80	greg	2.4	gamv = atof(argv[++i]);
81	greg	1.1	break;
82			case 'r':
83			reverse = !reverse;
84			break;
85			case 'b':
86			greyscale = 1;
87			break;
88	greg	1.10	case 'e':
89			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
90			goto userr;
91			bradj = atoi(argv[++i]);
92			break;
93	greg	1.1	case 'c':
94			ncolors = atoi(argv[++i]);
95			break;
96	greg	2.7	case 'n':
97			samplefac = atoi(argv[++i]);
98			break;
99	greg	1.1	default:
100			goto userr;
101			}
102			else
103			break;
104
105	greg	2.4	if (i < argc-2)
106			goto userr;
107			if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
108			sprintf(errmsg, "cannot open input \"%s\"", argv[i]);
109			quiterr(errmsg);
110			}
111			if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
112			sprintf(errmsg, "cannot open output \"%s\"", argv[i+1]);
113			quiterr(errmsg);
114			}
115	greg	1.1	if (reverse) {
116			/* get header */
117			if (getthead(&head, NULL, stdin) < 0)
118			quiterr("bad targa file");
119			if (!goodpic(&head))
120			quiterr("incompatible format");
121			xmax = head.x;
122			ymax = head.y;
123			/* put header */
124	greg	2.6	newheader("RADIANCE", stdout);
125	greg	1.6	printargs(i, argv, stdout);
126	greg	1.9	fputformat(COLRFMT, stdout);
127	greg	1.1	putchar('\n');
128	greg	1.12	fprtresolu(xmax, ymax, stdout);
129	greg	1.1	/* convert file */
130			tg2ra(&head);
131			} else {
132	greg	2.4	if (getrhead(&head, stdin) < 0)
133			quiterr("bad Radiance input");
134	greg	1.1	/* write header */
135			putthead(&head, NULL, stdout);
136			/* convert file */
137			if (greyscale)
138	greg	2.4	getgrey(ncolors);
139	greg	1.1	else
140	greg	2.4	getmapped(ncolors, dither);
141	greg	1.1	/* write data */
142			writetarga(&head, tarData, stdout);
143			}
144			quiterr(NULL);
145			userr:
146			fprintf(stderr,
147	greg	2.8	"Usage: %s [-d][-n samp][-c ncolors][-b][-g gamv][-e +/-stops] input [output]\n",
148	greg	1.1	progname);
149	greg	2.4	fprintf(stderr, " Or: %s -r [-g gamv][-e +/-stops] [input [output]]\n",
150	greg	1.1	progname);
151			exit(1);
152			}
153
154
155	schorsch	2.13	static int
156			getint2( /* get a 2-byte positive integer */
157			register FILE *fp
158			)
159	greg	1.1	{
160			register int b1, b2;
161
162			if ((b1 = getc(fp)) == EOF \|\| (b2 = getc(fp)) == EOF)
163			quiterr("read error");
164
165			return(b1 \| b2<<8);
166			}
167
168
169	schorsch	2.13	static void
170			putint2( /* put a 2-byte positive integer */
171			register int i,
172			register FILE *fp
173			)
174	greg	1.1	{
175			putc(i&0xff, fp);
176			putc(i>>8&0xff, fp);
177			}
178
179
180	schorsch	2.13	static void
181			quiterr( /* print message and exit */
182			char *err
183			)
184	greg	1.1	{
185			if (err != NULL) {
186			fprintf(stderr, "%s: %s\n", progname, err);
187			exit(1);
188			}
189			exit(0);
190			}
191
192
193	greg	2.10	void
194	greg	1.1	eputs(s)
195			char *s;
196			{
197			fputs(s, stderr);
198			}
199
200
201	greg	2.10	void
202	greg	1.1	quit(code)
203			int code;
204			{
205			exit(code);
206			}
207
208
209	schorsch	2.13	static int
210			getthead( /* read header from input */
211			struct hdStruct *hp,
212			char *ip,
213			register FILE *fp
214			)
215	greg	1.1	{
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	schorsch	2.13	static int
245			putthead( /* write header to output */
246			struct hdStruct *hp,
247			char *ip,
248			register FILE *fp
249			)
250	greg	1.1	{
251			if (ip != NULL)
252			putc(strlen(ip), fp);
253			else
254			putc(0, fp);
255			putc(hp->mapType, fp);
256			putc(hp->dataType, fp);
257			putint2(hp->mapOrig, fp);
258			putint2(hp->mapLength, fp);
259			putc(hp->CMapBits, fp);
260			putint2(hp->XOffset, fp);
261			putint2(hp->YOffset, fp);
262			putint2(hp->x, fp);
263			putint2(hp->y, fp);
264			putc(hp->dataBits, fp);
265			putc(hp->imType, fp);
266
267			if (ip != NULL)
268			fputs(ip, fp);
269
270			return(ferror(fp) ? -1 : 0);
271			}
272
273
274	schorsch	2.13	static int
275			getrhead( /* load RADIANCE input file header */
276			register struct hdStruct *h,
277			FILE *fp
278			)
279	greg	1.1	{
280	greg	1.9	/* get header info. */
281	greg	2.4	if (checkheader(fp, COLRFMT, NULL) < 0 \|\|
282			fgetresolu(&xmax, &ymax, fp) < 0)
283			return(-1);
284	greg	1.1	/* assign header */
285			h->textSize = 0;
286			h->mapType = CM_HASMAP;
287			h->dataType = IM_CMAP;
288			h->mapOrig = 0;
289			h->mapLength = 256;
290			h->CMapBits = 24;
291			h->XOffset = 0;
292			h->YOffset = 0;
293			h->x = xmax;
294			h->y = ymax;
295			h->dataBits = 8;
296			h->imType = 0;
297			/* allocate scanline */
298	greg	1.7	inl = (COLR )emalloc(xmaxsizeof(COLR));
299	greg	1.1	/* allocate targa data */
300			tarData = taralloc(h);
301
302	greg	2.4	return(0);
303	greg	1.1	}
304
305
306	schorsch	2.13	static void
307			tg2ra( /* targa file to RADIANCE file */
308			struct hdStruct *hp
309			)
310	greg	1.1	{
311			union {
312			BYTE c3[256][3];
313			BYTE c4[256][4];
314			} map;
315			COLR ctab[256];
316			COLR *scanline;
317			register int i, j;
318
319			/* get color table */
320	greg	1.12	if ((hp->CMapBits==24 ? fread((char *)(map.c3+hp->mapOrig),
321			3*hp->mapLength,1,stdin) :
322			fread((char *)(map.c4+hp->mapOrig),
323			4*hp->mapLength,1,stdin)) != 1)
324	greg	1.1	quiterr("error reading color table");
325			/* convert table */
326			for (i = hp->mapOrig; i < hp->mapOrig+hp->mapLength; i++)
327			if (hp->CMapBits == 24)
328			setcolr(ctab[i],
329	greg	2.4	pow((map.c3[i][2]+.5)/256.,gamv),
330			pow((map.c3[i][1]+.5)/256.,gamv),
331			pow((map.c3[i][0]+.5)/256.,gamv));
332	greg	1.1	else
333			setcolr(ctab[i],
334	greg	2.4	pow((map.c4[i][3]+.5)/256.,gamv),
335			pow((map.c4[i][2]+.5)/256.,gamv),
336			pow((map.c4[i][1]+.5)/256.,gamv));
337	greg	1.10	if (bradj)
338			shiftcolrs(ctab, 256, bradj);
339	greg	1.1	/* allocate targa data */
340			tarData = taralloc(hp);
341			/* get data */
342			readtarga(hp, tarData, stdin);
343			/* allocate input scanline */
344			scanline = (COLR )emalloc(xmaxsizeof(COLR));
345			/* convert file */
346			for (i = ymax-1; i >= 0; i--) {
347			for (j = 0; j < xmax; j++)
348			copycolr(scanline[j], ctab[tarData[i*xmax+j]]);
349			if (fwritecolrs(scanline, xmax, stdout) < 0)
350			quiterr("error writing RADIANCE file");
351			}
352	greg	2.10	free((void *)scanline);
353			free((void *)tarData);
354	greg	1.1	}
355
356
357	schorsch	2.13	static void
358			getmapped( /* read in and quantize image */
359			int nc, /* number of colors to use */
360			int dith /* use dithering? */
361			)
362	greg	1.1	{
363	greg	2.4	long fpos;
364			register int y;
365	greg	1.1
366	greg	2.4	setcolrgam(gamv);
367			fpos = ftell(stdin);
368	greg	2.7	if ((samplefac ? neu_init(xmaxymax) : new_histo(xmaxymax)) == -1)
369			quiterr("cannot initialized histogram");
370	greg	2.4	for (y = ymax-1; y >= 0; y--) {
371			if (freadcolrs(inl, xmax, stdin) < 0)
372			quiterr("error reading Radiance input");
373			if (bradj)
374			shiftcolrs(inl, xmax, bradj);
375			colrs_gambs(inl, xmax);
376	greg	2.7	if (samplefac)
377			neu_colrs(inl, xmax);
378			else
379			cnt_colrs(inl, xmax);
380	greg	1.1	}
381	greg	2.4	if (fseek(stdin, fpos, 0) == EOF)
382			quiterr("Radiance input must be from a file");
383	greg	2.7	if (samplefac) /* map colors */
384			neu_clrtab(nc);
385			else
386			new_clrtab(nc);
387	greg	2.4	for (y = ymax-1; y >= 0; y--) {
388			if (freadcolrs(inl, xmax, stdin) < 0)
389			quiterr("error reading Radiance input");
390			if (bradj)
391			shiftcolrs(inl, xmax, bradj);
392			colrs_gambs(inl, xmax);
393	greg	2.7	if (samplefac)
394			if (dith)
395			neu_dith_colrs(tarData+y*xmax, inl, xmax);
396			else
397			neu_map_colrs(tarData+y*xmax, inl, xmax);
398	greg	2.4	else
399	greg	2.7	if (dith)
400			dith_colrs(tarData+y*xmax, inl, xmax);
401			else
402			map_colrs(tarData+y*xmax, inl, xmax);
403	greg	2.4	}
404	greg	1.1	}
405
406
407	schorsch	2.13	static void
408			getgrey( /* read in and convert to greyscale image */
409			int nc /* number of colors to use */
410			)
411	greg	1.1	{
412	greg	2.4	int y;
413			register BYTE *dp;
414			register int x;
415
416			setcolrgam(gamv);
417			dp = tarData+xmax*ymax;;
418			for (y = ymax-1; y >= 0; y--) {
419			if (freadcolrs(inl, xmax, stdin) < 0)
420			quiterr("error reading Radiance input");
421			if (bradj)
422			shiftcolrs(inl, xmax, bradj);
423	greg	2.5	x = xmax;
424			while (x--)
425			inl[x][GRN] = normbright(inl[x]);
426	greg	2.4	colrs_gambs(inl, xmax);
427			x = xmax;
428			if (nc < 256)
429			while (x--)
430	greg	2.5	--dp = ((long)inl[x][GRN]nc+nc/2)>>8;
431	greg	2.4	else
432			while (x--)
433	greg	2.5	*--dp = inl[x][GRN];
434	greg	2.4	}
435			for (x = 0; x < nc; x++)
436			clrtab[x][RED] = clrtab[x][GRN] =
437	greg	2.5	clrtab[x][BLU] = ((long)x*256+128)/nc;
438	greg	1.1	}
439
440
441	schorsch	2.13	static void
442			writetarga( /* write out targa data */
443			struct hdStruct *h,
444			BYTE *d,
445			FILE *fp
446			)
447	greg	1.1	{
448	greg	2.4	register int i, j;
449
450			for (i = 0; i < h->mapLength; i++) /* write color map */
451			for (j = 2; j >= 0; j--)
452			putc(clrtab[i][j], fp);
453	greg	1.1	if (h->dataType == IM_CMAP) { /* uncompressed */
454	greg	2.4	if (fwrite((char )d,h->xsizeof(BYTE),h->y,fp) != h->y)
455	greg	1.1	quiterr("error writing targa file");
456			return;
457			}
458			quiterr("unsupported output type");
459			}
460
461
462	schorsch	2.13	static void
463			readtarga( /* read in targa data */
464			struct hdStruct *h,
465			BYTE *data,
466			FILE *fp
467			)
468	greg	1.1	{
469			register int cnt, c;
470	greg	2.4	register BYTE *dp;
471	greg	1.1
472			if (h->dataType == IM_CMAP) { /* uncompressed */
473	greg	2.4	if (fread((char )data,h->xsizeof(BYTE),h->y,fp) != h->y)
474	greg	1.1	goto readerr;
475			return;
476			}
477			for (dp = data; dp < data+h->x*h->y; ) {
478			if ((c = getc(fp)) == EOF)
479			goto readerr;
480			cnt = (c & 0x7f) + 1;
481			if (c & 0x80) { /* repeated pixel */
482			if ((c = getc(fp)) == EOF)
483			goto readerr;
484			while (cnt--)
485			*dp++ = c;
486			} else /* non-repeating pixels */
487			while (cnt--) {
488			if ((c = getc(fp)) == EOF)
489			goto readerr;
490			*dp++ = c;
491			}
492			}
493			return;
494			readerr:
495			quiterr("error reading targa file");
496			}