src/px/ra_t8.c

#ifndef lint
static const char       RCSid[] = "$Id: ra_t8.c,v 2.15 2018/03/20 18:45:04 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  *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:	2.16
Committed:	Sat Dec 28 18:05:14 2019 UTC (4 years, 4 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad5R3
Changes since 2.15:	+1 -4 lines
Log Message:	Removed redundant include files
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	greg	2.16	static const char RCSid[] = "$Id: ra_t8.c,v 2.15 2018/03/20 18:45:04 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	greg	2.10
13	schorsch	2.12	#include "platform.h"
14	greg	2.15	#include "rtio.h"
15	schorsch	2.13	#include "rtmisc.h"
16	greg	1.1	#include "color.h"
17	greg	1.12	#include "resolu.h"
18	schorsch	2.13	#include "clrtab.h"
19	greg	1.1	#include "targa.h"
20
21
22	greg	2.3	#define goodpic(h) (my_imType(h) && my_mapType(h))
23			#define my_imType(h) (((h)->dataType==IM_CMAP \|\| (h)->dataType==IM_CCMAP) \
24	greg	1.1	&& (h)->dataBits==8 && (h)->imType==0)
25	greg	2.3	#define my_mapType(h) ((h)->mapType==CM_HASMAP && \
26	greg	1.1	((h)->CMapBits==24 \|\| (h)->CMapBits==32))
27
28	greg	2.14	#define taralloc(h) (uby8 )emalloc((h)->x(h)->y)
29	greg	1.1
30	greg	2.14	uby8 clrtab[256][3];
31	greg	2.7	extern int samplefac;
32	greg	2.4	double gamv = 2.2; /* gamv correction */
33	greg	1.10	int bradj = 0; /* brightness adjustment */
34	greg	1.1	char *progname;
35			char errmsg[128];
36	greg	1.7	COLR *inl;
37	greg	2.14	uby8 *tarData;
38	schorsch	2.13	int xmax, ymax;
39	greg	1.1
40	schorsch	2.13	static int getint2(FILE *fp);
41			static void putint2(int i, FILE *fp);
42			static void quiterr(char *err);
43			static int getthead(struct hdStruct hp, char ip, FILE *fp);
44			static int putthead(struct hdStruct hp, char ip, FILE *fp);
45			static int getrhead(struct hdStruct h, FILE fp);
46			static void tg2ra(struct hdStruct *hp);
47			static void getmapped(int nc, int dith);
48			static void getgrey(int nc);
49	greg	2.14	static void writetarga(struct hdStruct h, uby8 d, FILE *fp);
50			static void readtarga(struct hdStruct h, uby8 data, FILE *fp);
51	greg	1.1
52
53	schorsch	2.13	int
54			main(
55			int argc,
56			char *argv[]
57			)
58	greg	1.1	{
59	greg	2.3	struct hdStruct head;
60	greg	1.1	int dither = 1;
61			int reverse = 0;
62			int ncolors = 256;
63			int greyscale = 0;
64			int i;
65	schorsch	2.12	SET_DEFAULT_BINARY();
66			SET_FILE_BINARY(stdin);
67			SET_FILE_BINARY(stdout);
68	greg	1.1	progname = argv[0];
69	greg	2.7	samplefac = 0;
70	greg	1.1
71			for (i = 1; i < argc; i++)
72			if (argv[i][0] == '-')
73			switch (argv[i][1]) {
74			case 'd':
75			dither = !dither;
76			break;
77			case 'g':
78	greg	2.4	gamv = atof(argv[++i]);
79	greg	1.1	break;
80			case 'r':
81			reverse = !reverse;
82			break;
83			case 'b':
84			greyscale = 1;
85			break;
86	greg	1.10	case 'e':
87			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
88			goto userr;
89			bradj = atoi(argv[++i]);
90			break;
91	greg	1.1	case 'c':
92			ncolors = atoi(argv[++i]);
93			break;
94	greg	2.7	case 'n':
95			samplefac = atoi(argv[++i]);
96			break;
97	greg	1.1	default:
98			goto userr;
99			}
100			else
101			break;
102
103	greg	2.4	if (i < argc-2)
104			goto userr;
105			if (i <= argc-1 && freopen(argv[i], "r", stdin) == NULL) {
106			sprintf(errmsg, "cannot open input \"%s\"", argv[i]);
107			quiterr(errmsg);
108			}
109			if (i == argc-2 && freopen(argv[i+1], "w", stdout) == NULL) {
110			sprintf(errmsg, "cannot open output \"%s\"", argv[i+1]);
111			quiterr(errmsg);
112			}
113	greg	1.1	if (reverse) {
114			/* get header */
115			if (getthead(&head, NULL, stdin) < 0)
116			quiterr("bad targa file");
117			if (!goodpic(&head))
118			quiterr("incompatible format");
119			xmax = head.x;
120			ymax = head.y;
121			/* put header */
122	greg	2.6	newheader("RADIANCE", stdout);
123	greg	1.6	printargs(i, argv, stdout);
124	greg	1.9	fputformat(COLRFMT, stdout);
125	greg	1.1	putchar('\n');
126	greg	1.12	fprtresolu(xmax, ymax, stdout);
127	greg	1.1	/* convert file */
128			tg2ra(&head);
129			} else {
130	greg	2.4	if (getrhead(&head, stdin) < 0)
131			quiterr("bad Radiance input");
132	greg	1.1	/* write header */
133			putthead(&head, NULL, stdout);
134			/* convert file */
135			if (greyscale)
136	greg	2.4	getgrey(ncolors);
137	greg	1.1	else
138	greg	2.4	getmapped(ncolors, dither);
139	greg	1.1	/* write data */
140			writetarga(&head, tarData, stdout);
141			}
142			quiterr(NULL);
143			userr:
144			fprintf(stderr,
145	greg	2.8	"Usage: %s [-d][-n samp][-c ncolors][-b][-g gamv][-e +/-stops] input [output]\n",
146	greg	1.1	progname);
147	greg	2.4	fprintf(stderr, " Or: %s -r [-g gamv][-e +/-stops] [input [output]]\n",
148	greg	1.1	progname);
149			exit(1);
150			}
151
152
153	schorsch	2.13	static int
154			getint2( /* get a 2-byte positive integer */
155			register FILE *fp
156			)
157	greg	1.1	{
158			register int b1, b2;
159
160			if ((b1 = getc(fp)) == EOF \|\| (b2 = getc(fp)) == EOF)
161			quiterr("read error");
162
163			return(b1 \| b2<<8);
164			}
165
166
167	schorsch	2.13	static void
168			putint2( /* put a 2-byte positive integer */
169			register int i,
170			register FILE *fp
171			)
172	greg	1.1	{
173			putc(i&0xff, fp);
174			putc(i>>8&0xff, fp);
175			}
176
177
178	schorsch	2.13	static void
179			quiterr( /* print message and exit */
180			char *err
181			)
182	greg	1.1	{
183			if (err != NULL) {
184			fprintf(stderr, "%s: %s\n", progname, err);
185			exit(1);
186			}
187			exit(0);
188			}
189
190
191	greg	2.10	void
192	greg	1.1	eputs(s)
193			char *s;
194			{
195			fputs(s, stderr);
196			}
197
198
199	greg	2.10	void
200	greg	1.1	quit(code)
201			int code;
202			{
203			exit(code);
204			}
205
206
207	schorsch	2.13	static int
208			getthead( /* read header from input */
209			struct hdStruct *hp,
210			char *ip,
211			register FILE *fp
212			)
213	greg	1.1	{
214			int nidbytes;
215
216			if ((nidbytes = getc(fp)) == EOF)
217			return(-1);
218			hp->mapType = getc(fp);
219			hp->dataType = getc(fp);
220			hp->mapOrig = getint2(fp);
221			hp->mapLength = getint2(fp);
222			hp->CMapBits = getc(fp);
223			hp->XOffset = getint2(fp);
224			hp->YOffset = getint2(fp);
225			hp->x = getint2(fp);
226			hp->y = getint2(fp);
227			hp->dataBits = getc(fp);
228			hp->imType = getc(fp);
229
230			if (ip != NULL)
231			if (nidbytes)
232	greg	1.4	fread((char *)ip, nidbytes, 1, fp);
233	greg	1.1	else
234			*ip = '\0';
235			else if (nidbytes)
236			fseek(fp, (long)nidbytes, 1);
237
238			return(feof(fp) \|\| ferror(fp) ? -1 : 0);
239			}
240
241
242	schorsch	2.13	static int
243			putthead( /* write header to output */
244			struct hdStruct *hp,
245			char *ip,
246			register FILE *fp
247			)
248	greg	1.1	{
249			if (ip != NULL)
250			putc(strlen(ip), fp);
251			else
252			putc(0, fp);
253			putc(hp->mapType, fp);
254			putc(hp->dataType, fp);
255			putint2(hp->mapOrig, fp);
256			putint2(hp->mapLength, fp);
257			putc(hp->CMapBits, fp);
258			putint2(hp->XOffset, fp);
259			putint2(hp->YOffset, fp);
260			putint2(hp->x, fp);
261			putint2(hp->y, fp);
262			putc(hp->dataBits, fp);
263			putc(hp->imType, fp);
264
265			if (ip != NULL)
266			fputs(ip, fp);
267
268			return(ferror(fp) ? -1 : 0);
269			}
270
271
272	schorsch	2.13	static int
273			getrhead( /* load RADIANCE input file header */
274			register struct hdStruct *h,
275			FILE *fp
276			)
277	greg	1.1	{
278	greg	1.9	/* get header info. */
279	greg	2.4	if (checkheader(fp, COLRFMT, NULL) < 0 \|\|
280			fgetresolu(&xmax, &ymax, fp) < 0)
281			return(-1);
282	greg	1.1	/* assign header */
283			h->textSize = 0;
284			h->mapType = CM_HASMAP;
285			h->dataType = IM_CMAP;
286			h->mapOrig = 0;
287			h->mapLength = 256;
288			h->CMapBits = 24;
289			h->XOffset = 0;
290			h->YOffset = 0;
291			h->x = xmax;
292			h->y = ymax;
293			h->dataBits = 8;
294			h->imType = 0;
295			/* allocate scanline */
296	greg	1.7	inl = (COLR )emalloc(xmaxsizeof(COLR));
297	greg	1.1	/* allocate targa data */
298			tarData = taralloc(h);
299
300	greg	2.4	return(0);
301	greg	1.1	}
302
303
304	schorsch	2.13	static void
305			tg2ra( /* targa file to RADIANCE file */
306			struct hdStruct *hp
307			)
308	greg	1.1	{
309			union {
310	greg	2.14	uby8 c3[256][3];
311			uby8 c4[256][4];
312	greg	1.1	} map;
313			COLR ctab[256];
314			COLR *scanline;
315			register int i, j;
316
317			/* get color table */
318	greg	1.12	if ((hp->CMapBits==24 ? fread((char *)(map.c3+hp->mapOrig),
319			3*hp->mapLength,1,stdin) :
320			fread((char *)(map.c4+hp->mapOrig),
321			4*hp->mapLength,1,stdin)) != 1)
322	greg	1.1	quiterr("error reading color table");
323			/* convert table */
324			for (i = hp->mapOrig; i < hp->mapOrig+hp->mapLength; i++)
325			if (hp->CMapBits == 24)
326			setcolr(ctab[i],
327	greg	2.4	pow((map.c3[i][2]+.5)/256.,gamv),
328			pow((map.c3[i][1]+.5)/256.,gamv),
329			pow((map.c3[i][0]+.5)/256.,gamv));
330	greg	1.1	else
331			setcolr(ctab[i],
332	greg	2.4	pow((map.c4[i][3]+.5)/256.,gamv),
333			pow((map.c4[i][2]+.5)/256.,gamv),
334			pow((map.c4[i][1]+.5)/256.,gamv));
335	greg	1.10	if (bradj)
336			shiftcolrs(ctab, 256, bradj);
337	greg	1.1	/* allocate targa data */
338			tarData = taralloc(hp);
339			/* get data */
340			readtarga(hp, tarData, stdin);
341			/* allocate input scanline */
342			scanline = (COLR )emalloc(xmaxsizeof(COLR));
343			/* convert file */
344			for (i = ymax-1; i >= 0; i--) {
345			for (j = 0; j < xmax; j++)
346			copycolr(scanline[j], ctab[tarData[i*xmax+j]]);
347			if (fwritecolrs(scanline, xmax, stdout) < 0)
348			quiterr("error writing RADIANCE file");
349			}
350	greg	2.10	free((void *)scanline);
351			free((void *)tarData);
352	greg	1.1	}
353
354
355	schorsch	2.13	static void
356			getmapped( /* read in and quantize image */
357			int nc, /* number of colors to use */
358			int dith /* use dithering? */
359			)
360	greg	1.1	{
361	greg	2.4	long fpos;
362			register int y;
363	greg	1.1
364	greg	2.4	setcolrgam(gamv);
365			fpos = ftell(stdin);
366	greg	2.7	if ((samplefac ? neu_init(xmaxymax) : new_histo(xmaxymax)) == -1)
367			quiterr("cannot initialized histogram");
368	greg	2.4	for (y = ymax-1; y >= 0; y--) {
369			if (freadcolrs(inl, xmax, stdin) < 0)
370			quiterr("error reading Radiance input");
371			if (bradj)
372			shiftcolrs(inl, xmax, bradj);
373			colrs_gambs(inl, xmax);
374	greg	2.7	if (samplefac)
375			neu_colrs(inl, xmax);
376			else
377			cnt_colrs(inl, xmax);
378	greg	1.1	}
379	greg	2.4	if (fseek(stdin, fpos, 0) == EOF)
380			quiterr("Radiance input must be from a file");
381	greg	2.7	if (samplefac) /* map colors */
382			neu_clrtab(nc);
383			else
384			new_clrtab(nc);
385	greg	2.4	for (y = ymax-1; y >= 0; y--) {
386			if (freadcolrs(inl, xmax, stdin) < 0)
387			quiterr("error reading Radiance input");
388			if (bradj)
389			shiftcolrs(inl, xmax, bradj);
390			colrs_gambs(inl, xmax);
391	greg	2.7	if (samplefac)
392			if (dith)
393			neu_dith_colrs(tarData+y*xmax, inl, xmax);
394			else
395			neu_map_colrs(tarData+y*xmax, inl, xmax);
396	greg	2.4	else
397	greg	2.7	if (dith)
398			dith_colrs(tarData+y*xmax, inl, xmax);
399			else
400			map_colrs(tarData+y*xmax, inl, xmax);
401	greg	2.4	}
402	greg	1.1	}
403
404
405	schorsch	2.13	static void
406			getgrey( /* read in and convert to greyscale image */
407			int nc /* number of colors to use */
408			)
409	greg	1.1	{
410	greg	2.4	int y;
411	greg	2.14	register uby8 *dp;
412	greg	2.4	register int x;
413
414			setcolrgam(gamv);
415			dp = tarData+xmax*ymax;;
416			for (y = ymax-1; y >= 0; y--) {
417			if (freadcolrs(inl, xmax, stdin) < 0)
418			quiterr("error reading Radiance input");
419			if (bradj)
420			shiftcolrs(inl, xmax, bradj);
421	greg	2.5	x = xmax;
422			while (x--)
423			inl[x][GRN] = normbright(inl[x]);
424	greg	2.4	colrs_gambs(inl, xmax);
425			x = xmax;
426			if (nc < 256)
427			while (x--)
428	greg	2.5	--dp = ((long)inl[x][GRN]nc+nc/2)>>8;
429	greg	2.4	else
430			while (x--)
431	greg	2.5	*--dp = inl[x][GRN];
432	greg	2.4	}
433			for (x = 0; x < nc; x++)
434			clrtab[x][RED] = clrtab[x][GRN] =
435	greg	2.5	clrtab[x][BLU] = ((long)x*256+128)/nc;
436	greg	1.1	}
437
438
439	schorsch	2.13	static void
440			writetarga( /* write out targa data */
441			struct hdStruct *h,
442	greg	2.14	uby8 *d,
443	schorsch	2.13	FILE *fp
444			)
445	greg	1.1	{
446	greg	2.4	register int i, j;
447
448			for (i = 0; i < h->mapLength; i++) /* write color map */
449			for (j = 2; j >= 0; j--)
450			putc(clrtab[i][j], fp);
451	greg	1.1	if (h->dataType == IM_CMAP) { /* uncompressed */
452	greg	2.14	if (fwrite((char )d,h->xsizeof(uby8),h->y,fp) != h->y)
453	greg	1.1	quiterr("error writing targa file");
454			return;
455			}
456			quiterr("unsupported output type");
457			}
458
459
460	schorsch	2.13	static void
461			readtarga( /* read in targa data */
462			struct hdStruct *h,
463	greg	2.14	uby8 *data,
464	schorsch	2.13	FILE *fp
465			)
466	greg	1.1	{
467			register int cnt, c;
468	greg	2.14	register uby8 *dp;
469	greg	1.1
470			if (h->dataType == IM_CMAP) { /* uncompressed */
471	greg	2.14	if (fread((char )data,h->xsizeof(uby8),h->y,fp) != h->y)
472	greg	1.1	goto readerr;
473			return;
474			}
475			for (dp = data; dp < data+h->x*h->y; ) {
476			if ((c = getc(fp)) == EOF)
477			goto readerr;
478			cnt = (c & 0x7f) + 1;
479			if (c & 0x80) { /* repeated pixel */
480			if ((c = getc(fp)) == EOF)
481			goto readerr;
482			while (cnt--)
483			*dp++ = c;
484			} else /* non-repeating pixels */
485			while (cnt--) {
486			if ((c = getc(fp)) == EOF)
487			goto readerr;
488			*dp++ = c;
489			}
490			}
491			return;
492			readerr:
493			quiterr("error reading targa file");
494			}