src/px/ra_t8.c

#ifndef lint
static const char       RCSid[] = "$Id: ra_t8.c,v 2.18 2025/06/06 19:11:21 greg 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  <math.h>
#include  "platform.h"
#include  "rtio.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)    (uby8 *)emalloc((h)->x*(h)->y)

uby8  clrtab[256][3];
extern int      samplefac;
double  gamv = 2.2;                     /* gamv correction */
int  bradj = 0;                         /* brightness adjustment */
char  errmsg[128];
COLR    *inl;
uby8    *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, uby8  *d, FILE  *fp);
static void readtarga(struct hdStruct    *h, uby8  *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);
        fixargv0(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 */
        FILE    *fp
)
{
        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 */
        int  i,
        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(const char *s)
{
        fputs(s, stderr);
}


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


static int
getthead(               /* read header from input */
        struct hdStruct  *hp,
        char  *ip,
        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,
        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 */
        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 {
                uby8  c3[256][3];
                uby8  c4[256][4];
        } map;
        COLR  ctab[256];
        COLR  *scanline;
        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;
        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;
        uby8  *dp;
        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,
        uby8  *d,
        FILE  *fp
)
{
        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(uby8),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,
        uby8  *data,
        FILE  *fp
)
{
        int  cnt, c;
        uby8    *dp;

        if (h->dataType == IM_CMAP) {           /* uncompressed */
                if (fread((char *)data,h->x*sizeof(uby8),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:	2.19
Committed:	Sat Jun 7 05:09:46 2025 UTC (2 weeks, 5 days ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 2.18:	+1 -2 lines
Log Message:	refactor: Put some declarations into "paths.h" and included in "platform.h"
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.19	static const char RCSid[] = "$Id: ra_t8.c,v 2.18 2025/06/06 19:11:21 greg 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	schorsch	2.12	#include <math.h>
12			#include "platform.h"
13	greg	2.15	#include "rtio.h"
14	schorsch	2.13	#include "rtmisc.h"
15	greg	1.1	#include "color.h"
16	greg	1.12	#include "resolu.h"
17	schorsch	2.13	#include "clrtab.h"
18	greg	1.1	#include "targa.h"
19
20
21	greg	2.3	#define goodpic(h) (my_imType(h) && my_mapType(h))
22			#define my_imType(h) (((h)->dataType==IM_CMAP \|\| (h)->dataType==IM_CCMAP) \
23	greg	1.1	&& (h)->dataBits==8 && (h)->imType==0)
24	greg	2.3	#define my_mapType(h) ((h)->mapType==CM_HASMAP && \
25	greg	1.1	((h)->CMapBits==24 \|\| (h)->CMapBits==32))
26
27	greg	2.14	#define taralloc(h) (uby8 )emalloc((h)->x(h)->y)
28	greg	1.1
29	greg	2.14	uby8 clrtab[256][3];
30	greg	2.7	extern int samplefac;
31	greg	2.4	double gamv = 2.2; /* gamv correction */
32	greg	1.10	int bradj = 0; /* brightness adjustment */
33	greg	1.1	char errmsg[128];
34	greg	1.7	COLR *inl;
35	greg	2.14	uby8 *tarData;
36	schorsch	2.13	int xmax, ymax;
37	greg	1.1
38	schorsch	2.13	static int getint2(FILE *fp);
39			static void putint2(int i, FILE *fp);
40			static void quiterr(char *err);
41			static int getthead(struct hdStruct hp, char ip, FILE *fp);
42			static int putthead(struct hdStruct hp, char ip, FILE *fp);
43			static int getrhead(struct hdStruct h, FILE fp);
44			static void tg2ra(struct hdStruct *hp);
45			static void getmapped(int nc, int dith);
46			static void getgrey(int nc);
47	greg	2.14	static void writetarga(struct hdStruct h, uby8 d, FILE *fp);
48			static void readtarga(struct hdStruct h, uby8 data, FILE *fp);
49	greg	1.1
50
51	schorsch	2.13	int
52			main(
53			int argc,
54			char *argv[]
55			)
56	greg	1.1	{
57	greg	2.3	struct hdStruct head;
58	greg	1.1	int dither = 1;
59			int reverse = 0;
60			int ncolors = 256;
61			int greyscale = 0;
62			int i;
63	greg	2.18
64	schorsch	2.12	SET_DEFAULT_BINARY();
65			SET_FILE_BINARY(stdin);
66			SET_FILE_BINARY(stdout);
67	greg	2.18	fixargv0(argv[0]);
68	greg	2.7	samplefac = 0;
69	greg	1.1
70			for (i = 1; i < argc; i++)
71			if (argv[i][0] == '-')
72			switch (argv[i][1]) {
73			case 'd':
74			dither = !dither;
75			break;
76			case 'g':
77	greg	2.4	gamv = atof(argv[++i]);
78	greg	1.1	break;
79			case 'r':
80			reverse = !reverse;
81			break;
82			case 'b':
83			greyscale = 1;
84			break;
85	greg	1.10	case 'e':
86			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
87			goto userr;
88			bradj = atoi(argv[++i]);
89			break;
90	greg	1.1	case 'c':
91			ncolors = atoi(argv[++i]);
92			break;
93	greg	2.7	case 'n':
94			samplefac = atoi(argv[++i]);
95			break;
96	greg	1.1	default:
97			goto userr;
98			}
99			else
100			break;
101
102	greg	2.4	if (i < argc-2)
103			goto userr;
104			if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
105			sprintf(errmsg, "cannot open input \"%s\"", argv[i]);
106			quiterr(errmsg);
107			}
108			if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
109			sprintf(errmsg, "cannot open output \"%s\"", argv[i+1]);
110			quiterr(errmsg);
111			}
112	greg	1.1	if (reverse) {
113			/* get header */
114			if (getthead(&head, NULL, stdin) < 0)
115			quiterr("bad targa file");
116			if (!goodpic(&head))
117			quiterr("incompatible format");
118			xmax = head.x;
119			ymax = head.y;
120			/* put header */
121	greg	2.6	newheader("RADIANCE", stdout);
122	greg	1.6	printargs(i, argv, stdout);
123	greg	1.9	fputformat(COLRFMT, stdout);
124	greg	1.1	putchar('\n');
125	greg	1.12	fprtresolu(xmax, ymax, stdout);
126	greg	1.1	/* convert file */
127			tg2ra(&head);
128			} else {
129	greg	2.4	if (getrhead(&head, stdin) < 0)
130			quiterr("bad Radiance input");
131	greg	1.1	/* write header */
132			putthead(&head, NULL, stdout);
133			/* convert file */
134			if (greyscale)
135	greg	2.4	getgrey(ncolors);
136	greg	1.1	else
137	greg	2.4	getmapped(ncolors, dither);
138	greg	1.1	/* write data */
139			writetarga(&head, tarData, stdout);
140			}
141			quiterr(NULL);
142			userr:
143			fprintf(stderr,
144	greg	2.8	"Usage: %s [-d][-n samp][-c ncolors][-b][-g gamv][-e +/-stops] input [output]\n",
145	greg	1.1	progname);
146	greg	2.4	fprintf(stderr, " Or: %s -r [-g gamv][-e +/-stops] [input [output]]\n",
147	greg	1.1	progname);
148			exit(1);
149			}
150
151
152	schorsch	2.13	static int
153			getint2( /* get a 2-byte positive integer */
154	greg	2.17	FILE *fp
155	schorsch	2.13	)
156	greg	1.1	{
157	greg	2.17	int b1, b2;
158	greg	1.1
159			if ((b1 = getc(fp)) == EOF \|\| (b2 = getc(fp)) == EOF)
160			quiterr("read error");
161
162			return(b1 \| b2<<8);
163			}
164
165
166	schorsch	2.13	static void
167			putint2( /* put a 2-byte positive integer */
168	greg	2.17	int i,
169			FILE *fp
170	schorsch	2.13	)
171	greg	1.1	{
172			putc(i&0xff, fp);
173			putc(i>>8&0xff, fp);
174			}
175
176
177	schorsch	2.13	static void
178			quiterr( /* print message and exit */
179			char *err
180			)
181	greg	1.1	{
182			if (err != NULL) {
183			fprintf(stderr, "%s: %s\n", progname, err);
184			exit(1);
185			}
186			exit(0);
187			}
188
189
190	greg	2.10	void
191	greg	2.17	eputs(const char *s)
192	greg	1.1	{
193			fputs(s, stderr);
194			}
195
196
197	greg	2.10	void
198	greg	2.17	quit(int code)
199	greg	1.1	{
200			exit(code);
201			}
202
203
204	schorsch	2.13	static int
205			getthead( /* read header from input */
206			struct hdStruct *hp,
207			char *ip,
208	greg	2.17	FILE *fp
209	schorsch	2.13	)
210	greg	1.1	{
211			int nidbytes;
212
213			if ((nidbytes = getc(fp)) == EOF)
214			return(-1);
215			hp->mapType = getc(fp);
216			hp->dataType = getc(fp);
217			hp->mapOrig = getint2(fp);
218			hp->mapLength = getint2(fp);
219			hp->CMapBits = getc(fp);
220			hp->XOffset = getint2(fp);
221			hp->YOffset = getint2(fp);
222			hp->x = getint2(fp);
223			hp->y = getint2(fp);
224			hp->dataBits = getc(fp);
225			hp->imType = getc(fp);
226
227			if (ip != NULL)
228			if (nidbytes)
229	greg	1.4	fread((char *)ip, nidbytes, 1, fp);
230	greg	1.1	else
231			*ip = '\0';
232			else if (nidbytes)
233			fseek(fp, (long)nidbytes, 1);
234
235			return(feof(fp) \|\| ferror(fp) ? -1 : 0);
236			}
237
238
239	schorsch	2.13	static int
240			putthead( /* write header to output */
241			struct hdStruct *hp,
242			char *ip,
243	greg	2.17	FILE *fp
244	schorsch	2.13	)
245	greg	1.1	{
246			if (ip != NULL)
247			putc(strlen(ip), fp);
248			else
249			putc(0, fp);
250			putc(hp->mapType, fp);
251			putc(hp->dataType, fp);
252			putint2(hp->mapOrig, fp);
253			putint2(hp->mapLength, fp);
254			putc(hp->CMapBits, fp);
255			putint2(hp->XOffset, fp);
256			putint2(hp->YOffset, fp);
257			putint2(hp->x, fp);
258			putint2(hp->y, fp);
259			putc(hp->dataBits, fp);
260			putc(hp->imType, fp);
261
262			if (ip != NULL)
263			fputs(ip, fp);
264
265			return(ferror(fp) ? -1 : 0);
266			}
267
268
269	schorsch	2.13	static int
270			getrhead( /* load RADIANCE input file header */
271	greg	2.17	struct hdStruct *h,
272	schorsch	2.13	FILE *fp
273			)
274	greg	1.1	{
275	greg	1.9	/* get header info. */
276	greg	2.4	if (checkheader(fp, COLRFMT, NULL) < 0 \|\|
277			fgetresolu(&xmax, &ymax, fp) < 0)
278			return(-1);
279	greg	1.1	/* assign header */
280			h->textSize = 0;
281			h->mapType = CM_HASMAP;
282			h->dataType = IM_CMAP;
283			h->mapOrig = 0;
284			h->mapLength = 256;
285			h->CMapBits = 24;
286			h->XOffset = 0;
287			h->YOffset = 0;
288			h->x = xmax;
289			h->y = ymax;
290			h->dataBits = 8;
291			h->imType = 0;
292			/* allocate scanline */
293	greg	1.7	inl = (COLR )emalloc(xmaxsizeof(COLR));
294	greg	1.1	/* allocate targa data */
295			tarData = taralloc(h);
296
297	greg	2.4	return(0);
298	greg	1.1	}
299
300
301	schorsch	2.13	static void
302			tg2ra( /* targa file to RADIANCE file */
303			struct hdStruct *hp
304			)
305	greg	1.1	{
306			union {
307	greg	2.14	uby8 c3[256][3];
308			uby8 c4[256][4];
309	greg	1.1	} map;
310			COLR ctab[256];
311			COLR *scanline;
312	greg	2.17	int i, j;
313	greg	1.1
314			/* get color table */
315	greg	1.12	if ((hp->CMapBits==24 ? fread((char *)(map.c3+hp->mapOrig),
316			3*hp->mapLength,1,stdin) :
317			fread((char *)(map.c4+hp->mapOrig),
318			4*hp->mapLength,1,stdin)) != 1)
319	greg	1.1	quiterr("error reading color table");
320			/* convert table */
321			for (i = hp->mapOrig; i < hp->mapOrig+hp->mapLength; i++)
322			if (hp->CMapBits == 24)
323			setcolr(ctab[i],
324	greg	2.4	pow((map.c3[i][2]+.5)/256.,gamv),
325			pow((map.c3[i][1]+.5)/256.,gamv),
326			pow((map.c3[i][0]+.5)/256.,gamv));
327	greg	1.1	else
328			setcolr(ctab[i],
329	greg	2.4	pow((map.c4[i][3]+.5)/256.,gamv),
330			pow((map.c4[i][2]+.5)/256.,gamv),
331			pow((map.c4[i][1]+.5)/256.,gamv));
332	greg	1.10	if (bradj)
333			shiftcolrs(ctab, 256, bradj);
334	greg	1.1	/* allocate targa data */
335			tarData = taralloc(hp);
336			/* get data */
337			readtarga(hp, tarData, stdin);
338			/* allocate input scanline */
339			scanline = (COLR )emalloc(xmaxsizeof(COLR));
340			/* convert file */
341			for (i = ymax-1; i >= 0; i--) {
342			for (j = 0; j < xmax; j++)
343			copycolr(scanline[j], ctab[tarData[i*xmax+j]]);
344			if (fwritecolrs(scanline, xmax, stdout) < 0)
345			quiterr("error writing RADIANCE file");
346			}
347	greg	2.10	free((void *)scanline);
348			free((void *)tarData);
349	greg	1.1	}
350
351
352	schorsch	2.13	static void
353			getmapped( /* read in and quantize image */
354			int nc, /* number of colors to use */
355			int dith /* use dithering? */
356			)
357	greg	1.1	{
358	greg	2.4	long fpos;
359	greg	2.17	int y;
360	greg	1.1
361	greg	2.4	setcolrgam(gamv);
362			fpos = ftell(stdin);
363	greg	2.7	if ((samplefac ? neu_init(xmaxymax) : new_histo(xmaxymax)) == -1)
364			quiterr("cannot initialized histogram");
365	greg	2.4	for (y = ymax-1; y >= 0; y--) {
366			if (freadcolrs(inl, xmax, stdin) < 0)
367			quiterr("error reading Radiance input");
368			if (bradj)
369			shiftcolrs(inl, xmax, bradj);
370			colrs_gambs(inl, xmax);
371	greg	2.7	if (samplefac)
372			neu_colrs(inl, xmax);
373			else
374			cnt_colrs(inl, xmax);
375	greg	1.1	}
376	greg	2.4	if (fseek(stdin, fpos, 0) == EOF)
377			quiterr("Radiance input must be from a file");
378	greg	2.7	if (samplefac) /* map colors */
379			neu_clrtab(nc);
380			else
381			new_clrtab(nc);
382	greg	2.4	for (y = ymax-1; y >= 0; y--) {
383			if (freadcolrs(inl, xmax, stdin) < 0)
384			quiterr("error reading Radiance input");
385			if (bradj)
386			shiftcolrs(inl, xmax, bradj);
387			colrs_gambs(inl, xmax);
388	greg	2.7	if (samplefac)
389			if (dith)
390			neu_dith_colrs(tarData+y*xmax, inl, xmax);
391			else
392			neu_map_colrs(tarData+y*xmax, inl, xmax);
393	greg	2.4	else
394	greg	2.7	if (dith)
395			dith_colrs(tarData+y*xmax, inl, xmax);
396			else
397			map_colrs(tarData+y*xmax, inl, xmax);
398	greg	2.4	}
399	greg	1.1	}
400
401
402	schorsch	2.13	static void
403			getgrey( /* read in and convert to greyscale image */
404			int nc /* number of colors to use */
405			)
406	greg	1.1	{
407	greg	2.4	int y;
408	greg	2.17	uby8 *dp;
409			int x;
410	greg	2.4
411			setcolrgam(gamv);
412			dp = tarData+xmax*ymax;;
413			for (y = ymax-1; y >= 0; y--) {
414			if (freadcolrs(inl, xmax, stdin) < 0)
415			quiterr("error reading Radiance input");
416			if (bradj)
417			shiftcolrs(inl, xmax, bradj);
418	greg	2.5	x = xmax;
419			while (x--)
420			inl[x][GRN] = normbright(inl[x]);
421	greg	2.4	colrs_gambs(inl, xmax);
422			x = xmax;
423			if (nc < 256)
424			while (x--)
425	greg	2.5	--dp = ((long)inl[x][GRN]nc+nc/2)>>8;
426	greg	2.4	else
427			while (x--)
428	greg	2.5	*--dp = inl[x][GRN];
429	greg	2.4	}
430			for (x = 0; x < nc; x++)
431			clrtab[x][RED] = clrtab[x][GRN] =
432	greg	2.5	clrtab[x][BLU] = ((long)x*256+128)/nc;
433	greg	1.1	}
434
435
436	schorsch	2.13	static void
437			writetarga( /* write out targa data */
438			struct hdStruct *h,
439	greg	2.14	uby8 *d,
440	schorsch	2.13	FILE *fp
441			)
442	greg	1.1	{
443	greg	2.17	int i, j;
444	greg	2.4
445			for (i = 0; i < h->mapLength; i++) /* write color map */
446			for (j = 2; j >= 0; j--)
447			putc(clrtab[i][j], fp);
448	greg	1.1	if (h->dataType == IM_CMAP) { /* uncompressed */
449	greg	2.14	if (fwrite((char )d,h->xsizeof(uby8),h->y,fp) != h->y)
450	greg	1.1	quiterr("error writing targa file");
451			return;
452			}
453			quiterr("unsupported output type");
454			}
455
456
457	schorsch	2.13	static void
458			readtarga( /* read in targa data */
459			struct hdStruct *h,
460	greg	2.14	uby8 *data,
461	schorsch	2.13	FILE *fp
462			)
463	greg	1.1	{
464	greg	2.17	int cnt, c;
465			uby8 *dp;
466	greg	1.1
467			if (h->dataType == IM_CMAP) { /* uncompressed */
468	greg	2.14	if (fread((char )data,h->xsizeof(uby8),h->y,fp) != h->y)
469	greg	1.1	goto readerr;
470			return;
471			}
472			for (dp = data; dp < data+h->x*h->y; ) {
473			if ((c = getc(fp)) == EOF)
474			goto readerr;
475			cnt = (c & 0x7f) + 1;
476			if (c & 0x80) { /* repeated pixel */
477			if ((c = getc(fp)) == EOF)
478			goto readerr;
479			while (cnt--)
480			*dp++ = c;
481			} else /* non-repeating pixels */
482			while (cnt--) {
483			if ((c = getc(fp)) == EOF)
484			goto readerr;
485			*dp++ = c;
486			}
487			}
488			return;
489			readerr:
490			quiterr("error reading targa file");
491			}