src/px/ra_t8.c

#ifndef lint
static const char       RCSid[] = "$Id: ra_t8.c,v 2.14 2011/05/20 02:06:39 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  <stdio.h>
#include  <string.h>
#include  <time.h>
#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  *progname;
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);
        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 {
                uby8  c3[256][3];
                uby8  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 uby8  *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,
        uby8  *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(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
)
{
        register int  cnt, c;
        register 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:	2.15
Committed:	Tue Mar 20 18:45:04 2018 UTC (6 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R2
Changes since 2.14:	+2 -1 lines
Log Message:	Added missing rtio.h include to redefine getc, putc, etc.
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.15	static const char RCSid[] = "$Id: ra_t8.c,v 2.14 2011/05/20 02:06:39 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			#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	greg	2.15	#include "rtio.h"
18	schorsch	2.13	#include "rtmisc.h"
19	greg	1.1	#include "color.h"
20	greg	1.12	#include "resolu.h"
21	schorsch	2.13	#include "clrtab.h"
22	greg	1.1	#include "targa.h"
23
24
25	greg	2.3	#define goodpic(h) (my_imType(h) && my_mapType(h))
26			#define my_imType(h) (((h)->dataType==IM_CMAP \|\| (h)->dataType==IM_CCMAP) \
27	greg	1.1	&& (h)->dataBits==8 && (h)->imType==0)
28	greg	2.3	#define my_mapType(h) ((h)->mapType==CM_HASMAP && \
29	greg	1.1	((h)->CMapBits==24 \|\| (h)->CMapBits==32))
30
31	greg	2.14	#define taralloc(h) (uby8 )emalloc((h)->x(h)->y)
32	greg	1.1
33	greg	2.14	uby8 clrtab[256][3];
34	greg	2.7	extern int samplefac;
35	greg	2.4	double gamv = 2.2; /* gamv correction */
36	greg	1.10	int bradj = 0; /* brightness adjustment */
37	greg	1.1	char *progname;
38			char errmsg[128];
39	greg	1.7	COLR *inl;
40	greg	2.14	uby8 *tarData;
41	schorsch	2.13	int xmax, ymax;
42	greg	1.1
43	schorsch	2.13	static int getint2(FILE *fp);
44			static void putint2(int i, FILE *fp);
45			static void quiterr(char *err);
46			static int getthead(struct hdStruct hp, char ip, FILE *fp);
47			static int putthead(struct hdStruct hp, char ip, FILE *fp);
48			static int getrhead(struct hdStruct h, FILE fp);
49			static void tg2ra(struct hdStruct *hp);
50			static void getmapped(int nc, int dith);
51			static void getgrey(int nc);
52	greg	2.14	static void writetarga(struct hdStruct h, uby8 d, FILE *fp);
53			static void readtarga(struct hdStruct h, uby8 data, FILE *fp);
54	greg	1.1
55
56	schorsch	2.13	int
57			main(
58			int argc,
59			char *argv[]
60			)
61	greg	1.1	{
62	greg	2.3	struct hdStruct head;
63	greg	1.1	int dither = 1;
64			int reverse = 0;
65			int ncolors = 256;
66			int greyscale = 0;
67			int i;
68	schorsch	2.12	SET_DEFAULT_BINARY();
69			SET_FILE_BINARY(stdin);
70			SET_FILE_BINARY(stdout);
71	greg	1.1	progname = argv[0];
72	greg	2.7	samplefac = 0;
73	greg	1.1
74			for (i = 1; i < argc; i++)
75			if (argv[i][0] == '-')
76			switch (argv[i][1]) {
77			case 'd':
78			dither = !dither;
79			break;
80			case 'g':
81	greg	2.4	gamv = atof(argv[++i]);
82	greg	1.1	break;
83			case 'r':
84			reverse = !reverse;
85			break;
86			case 'b':
87			greyscale = 1;
88			break;
89	greg	1.10	case 'e':
90			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
91			goto userr;
92			bradj = atoi(argv[++i]);
93			break;
94	greg	1.1	case 'c':
95			ncolors = atoi(argv[++i]);
96			break;
97	greg	2.7	case 'n':
98			samplefac = atoi(argv[++i]);
99			break;
100	greg	1.1	default:
101			goto userr;
102			}
103			else
104			break;
105
106	greg	2.4	if (i < argc-2)
107			goto userr;
108			if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
109			sprintf(errmsg, "cannot open input \"%s\"", argv[i]);
110			quiterr(errmsg);
111			}
112			if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
113			sprintf(errmsg, "cannot open output \"%s\"", argv[i+1]);
114			quiterr(errmsg);
115			}
116	greg	1.1	if (reverse) {
117			/* get header */
118			if (getthead(&head, NULL, stdin) < 0)
119			quiterr("bad targa file");
120			if (!goodpic(&head))
121			quiterr("incompatible format");
122			xmax = head.x;
123			ymax = head.y;
124			/* put header */
125	greg	2.6	newheader("RADIANCE", stdout);
126	greg	1.6	printargs(i, argv, stdout);
127	greg	1.9	fputformat(COLRFMT, stdout);
128	greg	1.1	putchar('\n');
129	greg	1.12	fprtresolu(xmax, ymax, stdout);
130	greg	1.1	/* convert file */
131			tg2ra(&head);
132			} else {
133	greg	2.4	if (getrhead(&head, stdin) < 0)
134			quiterr("bad Radiance input");
135	greg	1.1	/* write header */
136			putthead(&head, NULL, stdout);
137			/* convert file */
138			if (greyscale)
139	greg	2.4	getgrey(ncolors);
140	greg	1.1	else
141	greg	2.4	getmapped(ncolors, dither);
142	greg	1.1	/* write data */
143			writetarga(&head, tarData, stdout);
144			}
145			quiterr(NULL);
146			userr:
147			fprintf(stderr,
148	greg	2.8	"Usage: %s [-d][-n samp][-c ncolors][-b][-g gamv][-e +/-stops] input [output]\n",
149	greg	1.1	progname);
150	greg	2.4	fprintf(stderr, " Or: %s -r [-g gamv][-e +/-stops] [input [output]]\n",
151	greg	1.1	progname);
152			exit(1);
153			}
154
155
156	schorsch	2.13	static int
157			getint2( /* get a 2-byte positive integer */
158			register FILE *fp
159			)
160	greg	1.1	{
161			register int b1, b2;
162
163			if ((b1 = getc(fp)) == EOF \|\| (b2 = getc(fp)) == EOF)
164			quiterr("read error");
165
166			return(b1 \| b2<<8);
167			}
168
169
170	schorsch	2.13	static void
171			putint2( /* put a 2-byte positive integer */
172			register int i,
173			register FILE *fp
174			)
175	greg	1.1	{
176			putc(i&0xff, fp);
177			putc(i>>8&0xff, fp);
178			}
179
180
181	schorsch	2.13	static void
182			quiterr( /* print message and exit */
183			char *err
184			)
185	greg	1.1	{
186			if (err != NULL) {
187			fprintf(stderr, "%s: %s\n", progname, err);
188			exit(1);
189			}
190			exit(0);
191			}
192
193
194	greg	2.10	void
195	greg	1.1	eputs(s)
196			char *s;
197			{
198			fputs(s, stderr);
199			}
200
201
202	greg	2.10	void
203	greg	1.1	quit(code)
204			int code;
205			{
206			exit(code);
207			}
208
209
210	schorsch	2.13	static int
211			getthead( /* read header from input */
212			struct hdStruct *hp,
213			char *ip,
214			register FILE *fp
215			)
216	greg	1.1	{
217			int nidbytes;
218
219			if ((nidbytes = getc(fp)) == EOF)
220			return(-1);
221			hp->mapType = getc(fp);
222			hp->dataType = getc(fp);
223			hp->mapOrig = getint2(fp);
224			hp->mapLength = getint2(fp);
225			hp->CMapBits = getc(fp);
226			hp->XOffset = getint2(fp);
227			hp->YOffset = getint2(fp);
228			hp->x = getint2(fp);
229			hp->y = getint2(fp);
230			hp->dataBits = getc(fp);
231			hp->imType = getc(fp);
232
233			if (ip != NULL)
234			if (nidbytes)
235	greg	1.4	fread((char *)ip, nidbytes, 1, fp);
236	greg	1.1	else
237			*ip = '\0';
238			else if (nidbytes)
239			fseek(fp, (long)nidbytes, 1);
240
241			return(feof(fp) \|\| ferror(fp) ? -1 : 0);
242			}
243
244
245	schorsch	2.13	static int
246			putthead( /* write header to output */
247			struct hdStruct *hp,
248			char *ip,
249			register FILE *fp
250			)
251	greg	1.1	{
252			if (ip != NULL)
253			putc(strlen(ip), fp);
254			else
255			putc(0, fp);
256			putc(hp->mapType, fp);
257			putc(hp->dataType, fp);
258			putint2(hp->mapOrig, fp);
259			putint2(hp->mapLength, fp);
260			putc(hp->CMapBits, fp);
261			putint2(hp->XOffset, fp);
262			putint2(hp->YOffset, fp);
263			putint2(hp->x, fp);
264			putint2(hp->y, fp);
265			putc(hp->dataBits, fp);
266			putc(hp->imType, fp);
267
268			if (ip != NULL)
269			fputs(ip, fp);
270
271			return(ferror(fp) ? -1 : 0);
272			}
273
274
275	schorsch	2.13	static int
276			getrhead( /* load RADIANCE input file header */
277			register struct hdStruct *h,
278			FILE *fp
279			)
280	greg	1.1	{
281	greg	1.9	/* get header info. */
282	greg	2.4	if (checkheader(fp, COLRFMT, NULL) < 0 \|\|
283			fgetresolu(&xmax, &ymax, fp) < 0)
284			return(-1);
285	greg	1.1	/* assign header */
286			h->textSize = 0;
287			h->mapType = CM_HASMAP;
288			h->dataType = IM_CMAP;
289			h->mapOrig = 0;
290			h->mapLength = 256;
291			h->CMapBits = 24;
292			h->XOffset = 0;
293			h->YOffset = 0;
294			h->x = xmax;
295			h->y = ymax;
296			h->dataBits = 8;
297			h->imType = 0;
298			/* allocate scanline */
299	greg	1.7	inl = (COLR )emalloc(xmaxsizeof(COLR));
300	greg	1.1	/* allocate targa data */
301			tarData = taralloc(h);
302
303	greg	2.4	return(0);
304	greg	1.1	}
305
306
307	schorsch	2.13	static void
308			tg2ra( /* targa file to RADIANCE file */
309			struct hdStruct *hp
310			)
311	greg	1.1	{
312			union {
313	greg	2.14	uby8 c3[256][3];
314			uby8 c4[256][4];
315	greg	1.1	} map;
316			COLR ctab[256];
317			COLR *scanline;
318			register int i, j;
319
320			/* get color table */
321	greg	1.12	if ((hp->CMapBits==24 ? fread((char *)(map.c3+hp->mapOrig),
322			3*hp->mapLength,1,stdin) :
323			fread((char *)(map.c4+hp->mapOrig),
324			4*hp->mapLength,1,stdin)) != 1)
325	greg	1.1	quiterr("error reading color table");
326			/* convert table */
327			for (i = hp->mapOrig; i < hp->mapOrig+hp->mapLength; i++)
328			if (hp->CMapBits == 24)
329			setcolr(ctab[i],
330	greg	2.4	pow((map.c3[i][2]+.5)/256.,gamv),
331			pow((map.c3[i][1]+.5)/256.,gamv),
332			pow((map.c3[i][0]+.5)/256.,gamv));
333	greg	1.1	else
334			setcolr(ctab[i],
335	greg	2.4	pow((map.c4[i][3]+.5)/256.,gamv),
336			pow((map.c4[i][2]+.5)/256.,gamv),
337			pow((map.c4[i][1]+.5)/256.,gamv));
338	greg	1.10	if (bradj)
339			shiftcolrs(ctab, 256, bradj);
340	greg	1.1	/* allocate targa data */
341			tarData = taralloc(hp);
342			/* get data */
343			readtarga(hp, tarData, stdin);
344			/* allocate input scanline */
345			scanline = (COLR )emalloc(xmaxsizeof(COLR));
346			/* convert file */
347			for (i = ymax-1; i >= 0; i--) {
348			for (j = 0; j < xmax; j++)
349			copycolr(scanline[j], ctab[tarData[i*xmax+j]]);
350			if (fwritecolrs(scanline, xmax, stdout) < 0)
351			quiterr("error writing RADIANCE file");
352			}
353	greg	2.10	free((void *)scanline);
354			free((void *)tarData);
355	greg	1.1	}
356
357
358	schorsch	2.13	static void
359			getmapped( /* read in and quantize image */
360			int nc, /* number of colors to use */
361			int dith /* use dithering? */
362			)
363	greg	1.1	{
364	greg	2.4	long fpos;
365			register int y;
366	greg	1.1
367	greg	2.4	setcolrgam(gamv);
368			fpos = ftell(stdin);
369	greg	2.7	if ((samplefac ? neu_init(xmaxymax) : new_histo(xmaxymax)) == -1)
370			quiterr("cannot initialized histogram");
371	greg	2.4	for (y = ymax-1; y >= 0; y--) {
372			if (freadcolrs(inl, xmax, stdin) < 0)
373			quiterr("error reading Radiance input");
374			if (bradj)
375			shiftcolrs(inl, xmax, bradj);
376			colrs_gambs(inl, xmax);
377	greg	2.7	if (samplefac)
378			neu_colrs(inl, xmax);
379			else
380			cnt_colrs(inl, xmax);
381	greg	1.1	}
382	greg	2.4	if (fseek(stdin, fpos, 0) == EOF)
383			quiterr("Radiance input must be from a file");
384	greg	2.7	if (samplefac) /* map colors */
385			neu_clrtab(nc);
386			else
387			new_clrtab(nc);
388	greg	2.4	for (y = ymax-1; y >= 0; y--) {
389			if (freadcolrs(inl, xmax, stdin) < 0)
390			quiterr("error reading Radiance input");
391			if (bradj)
392			shiftcolrs(inl, xmax, bradj);
393			colrs_gambs(inl, xmax);
394	greg	2.7	if (samplefac)
395			if (dith)
396			neu_dith_colrs(tarData+y*xmax, inl, xmax);
397			else
398			neu_map_colrs(tarData+y*xmax, inl, xmax);
399	greg	2.4	else
400	greg	2.7	if (dith)
401			dith_colrs(tarData+y*xmax, inl, xmax);
402			else
403			map_colrs(tarData+y*xmax, inl, xmax);
404	greg	2.4	}
405	greg	1.1	}
406
407
408	schorsch	2.13	static void
409			getgrey( /* read in and convert to greyscale image */
410			int nc /* number of colors to use */
411			)
412	greg	1.1	{
413	greg	2.4	int y;
414	greg	2.14	register uby8 *dp;
415	greg	2.4	register int x;
416
417			setcolrgam(gamv);
418			dp = tarData+xmax*ymax;;
419			for (y = ymax-1; y >= 0; y--) {
420			if (freadcolrs(inl, xmax, stdin) < 0)
421			quiterr("error reading Radiance input");
422			if (bradj)
423			shiftcolrs(inl, xmax, bradj);
424	greg	2.5	x = xmax;
425			while (x--)
426			inl[x][GRN] = normbright(inl[x]);
427	greg	2.4	colrs_gambs(inl, xmax);
428			x = xmax;
429			if (nc < 256)
430			while (x--)
431	greg	2.5	--dp = ((long)inl[x][GRN]nc+nc/2)>>8;
432	greg	2.4	else
433			while (x--)
434	greg	2.5	*--dp = inl[x][GRN];
435	greg	2.4	}
436			for (x = 0; x < nc; x++)
437			clrtab[x][RED] = clrtab[x][GRN] =
438	greg	2.5	clrtab[x][BLU] = ((long)x*256+128)/nc;
439	greg	1.1	}
440
441
442	schorsch	2.13	static void
443			writetarga( /* write out targa data */
444			struct hdStruct *h,
445	greg	2.14	uby8 *d,
446	schorsch	2.13	FILE *fp
447			)
448	greg	1.1	{
449	greg	2.4	register int i, j;
450
451			for (i = 0; i < h->mapLength; i++) /* write color map */
452			for (j = 2; j >= 0; j--)
453			putc(clrtab[i][j], fp);
454	greg	1.1	if (h->dataType == IM_CMAP) { /* uncompressed */
455	greg	2.14	if (fwrite((char )d,h->xsizeof(uby8),h->y,fp) != h->y)
456	greg	1.1	quiterr("error writing targa file");
457			return;
458			}
459			quiterr("unsupported output type");
460			}
461
462
463	schorsch	2.13	static void
464			readtarga( /* read in targa data */
465			struct hdStruct *h,
466	greg	2.14	uby8 *data,
467	schorsch	2.13	FILE *fp
468			)
469	greg	1.1	{
470			register int cnt, c;
471	greg	2.14	register uby8 *dp;
472	greg	1.1
473			if (h->dataType == IM_CMAP) { /* uncompressed */
474	greg	2.14	if (fread((char )data,h->xsizeof(uby8),h->y,fp) != h->y)
475	greg	1.1	goto readerr;
476			return;
477			}
478			for (dp = data; dp < data+h->x*h->y; ) {
479			if ((c = getc(fp)) == EOF)
480			goto readerr;
481			cnt = (c & 0x7f) + 1;
482			if (c & 0x80) { /* repeated pixel */
483			if ((c = getc(fp)) == EOF)
484			goto readerr;
485			while (cnt--)
486			*dp++ = c;
487			} else /* non-repeating pixels */
488			while (cnt--) {
489			if ((c = getc(fp)) == EOF)
490			goto readerr;
491			*dp++ = c;
492			}
493			}
494			return;
495			readerr:
496			quiterr("error reading targa file");
497			}