src/px/ra_bmp.c

#ifndef lint
static const char RCSid[] = "$Id: ra_bmp.c,v 2.17 2025/06/07 05:09:46 greg Exp $";
#endif
/*
 *  program to convert between RADIANCE and Windows BMP file
 */

#include  <math.h>

#include  "rtio.h"
#include  "platform.h"
#include  "color.h"
#include  "tonemap.h"
#include  "resolu.h"
#include  "bmpfile.h"

int             bradj = 0;              /* brightness adjustment */

double          gamcor = 2.2;           /* gamma correction value */

char            *info = "";             /* information header string */
int             infolen = 0;            /* information header length */

extern void quiterr(const char *err);
extern void addBMPcspace(RGBPRIMP pp, double gamma);
extern void tmap2bmp(char *fnin, char *fnout, char *expec,
                                RGBPRIMP monpri, double gamval);
extern void rad2bmp(FILE *rfp, BMPWriter *bwr, int inv, RGBPRIMP monpri);
extern void bmp2rad(BMPReader *brd, FILE *rfp, int inv);
extern void info2rad(char *infs, int len, FILE *fout);
extern char *growInfo(int n);
extern gethfunc headline;

#define add2info(s)     strcpy(growInfo(strlen(s)), s)
#define clearInfo()     growInfo(-infolen)

RGBPRIMP        rgbinp = stdprims;      /* RGB input primitives */
RGBPRIMS        myinprims;              /* custom primitives holder */


int
main(int argc, char *argv[])
{
        char            *inpfile=NULL, *outfile=NULL;
        char            *expec = NULL;
        int             reverse = 0;
        RGBPRIMP        rgbp = stdprims;
        RGBPRIMS        myprims;
        RESOLU          rs;
        int             i;
        
        fixargv0(argv[0]);              /* assigns progname */

        for (i = 1; i < argc; i++)
                if (argv[i][0] == '-' && argv[i][1])
                        switch (argv[i][1]) {
                        case 'b':
                                rgbp = NULL;
                                break;
                        case 'g':
                                gamcor = atof(argv[++i]);
                                break;
                        case 'e':
                                if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
                                        expec = argv[++i];
                                else
                                        bradj = atoi(argv[++i]);
                                break;
                        case 'p':
                                if (argc-i < 9)
                                        goto userr;
                                myprims[RED][CIEX] = atof(argv[++i]);
                                myprims[RED][CIEY] = atof(argv[++i]);
                                myprims[GRN][CIEX] = atof(argv[++i]);
                                myprims[GRN][CIEY] = atof(argv[++i]);
                                myprims[BLU][CIEX] = atof(argv[++i]);
                                myprims[BLU][CIEY] = atof(argv[++i]);
                                myprims[WHT][CIEX] = atof(argv[++i]);
                                myprims[WHT][CIEY] = atof(argv[++i]);
                                if (rgbp == stdprims)
                                        rgbp = myprims;
                                break;
                        case 'r':
                                reverse = !reverse;
                                break;
                        default:
                                goto userr;
                        }
                else
                        break;

        if (i < argc-2)
                goto userr;

        SET_FILE_BINARY(stdin);
        SET_FILE_BINARY(stdout);
        SET_DEFAULT_BINARY();

        if (i <= argc-1 && strcmp(argv[i], "-"))
                inpfile = argv[i];

        if (i == argc-2 && strcmp(argv[i+1], "-"))
                outfile = argv[i+1];

        if (expec != NULL) {            /* check for tone-mapping */
                if (reverse)
                        goto userr;
                tmap2bmp(inpfile, outfile, expec, rgbp, gamcor);
                return(0);
        }
        if (reverse) {
                BMPReader       *rdr;
                                        /* open BMP file or stream */
                if (inpfile != NULL)
                        rdr = BMPopenInputFile(inpfile);
                else
                        rdr = BMPopenInputStream(stdin);
                        
                if (rdr == NULL) {
                        fprintf(stderr, "%s: cannot open or recognize BMP\n",
                                inpfile != NULL ? inpfile : "<stdin>");
                        exit(1);
                }
                                        /* open Radiance output */
                if (outfile != NULL && freopen(outfile, "w", stdout) == NULL) {
                        fprintf(stderr, "%s: cannot open for output\n",
                                        outfile);
                        exit(1);
                }
                                        /* put Radiance header */
                newheader("RADIANCE", stdout);
                info2rad(BMPinfo(rdr->hdr), rdr->hdr->infoSiz, stdout);
                printargs(i, argv, stdout);
                fputformat(COLRFMT, stdout);
                putchar('\n');
                rs.xr = rdr->hdr->width;
                rs.yr = rdr->hdr->height;
                rs.rt = YMAJOR;
                                        /* write scans downward if we can */
                if (rdr->hdr->yIsDown || inpfile != NULL)
                        rs.rt |= YDECR;
                fputsresolu(&rs, stdout);
                                        /* set up conversion */
                setcolrgam(gamcor);
                                        /* convert file */
                bmp2rad(rdr, stdout, !rdr->hdr->yIsDown & (inpfile!=NULL));
                                        /* flush output */
                BMPcloseInput(rdr);
                if (fflush(stdout) < 0)
                        quiterr("error writing Radiance output");
        } else {
                BMPHeader       *hdr;
                BMPWriter       *wtr;
                                        /* open Radiance input */
                if (inpfile != NULL && freopen(inpfile, "r", stdin) == NULL) {
                        fprintf(stderr, "%s: cannot open input file\n",
                                        inpfile);
                        exit(1);
                }
                                        /* get/save header info. */
                if (getheader(stdin, headline, NULL) < 0 ||
                                        !fgetsresolu(&rs, stdin))
                        quiterr("bad Radiance picture format");
                                        /* record color space */
                addBMPcspace(rgbp, gamcor);
                                        /* open output/write BMP header */
                if (rgbp == NULL) {
                        hdr = BMPmappedHeader(scanlen(&rs),
                                                numscans(&rs), infolen+1, 256);
                        /*
                        if (outfile != NULL)
                                hdr->compr = BI_RLE8;
                        */
                } else
                        hdr = BMPtruecolorHeader(scanlen(&rs),
                                                numscans(&rs), infolen+1);
                if (hdr == NULL)
                        quiterr("cannot create BMP output");
                                        /* copy info to BMP header */
                strcpy(BMPinfo(hdr), info);
                clearInfo();
                                        /* set up output direction */
                hdr->yIsDown = ((outfile == NULL) | (hdr->compr == BI_RLE8));
                                        /* open BMP output */
                if (outfile != NULL)
                        wtr = BMPopenOutputFile(outfile, hdr);
                else
                        wtr = BMPopenOutputStream(stdout, hdr);
                if (wtr == NULL)
                        quiterr("cannot allocate writer structure");
                                        /* set up conversion */
                setcolrgam(gamcor);
                                        /* convert file */
                rad2bmp(stdin, wtr, !hdr->yIsDown, rgbp);
                                        /* flush output */
                if (fflush((FILE *)wtr->c_data) < 0)
                        quiterr("error writing BMP output");
                BMPcloseOutput(wtr);
        }
        return(0);                      /* success */
userr:
        fprintf(stderr,
"Usage: %s [-b][-g gamma][-e spec][-p xr yr xg yg xb yb xw yw] [input|- [output]]\n",
                        progname);
        fprintf(stderr,
                "   or: %s -r [-g gamma][-e +/-stops] [input|- [output]]\n",
                        progname);
        return(1);
}

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

/* grow (or shrink) saved info header string */
char *
growInfo(int n)
{
        char    *ns = NULL;

        if (infolen + n <= 0) {
                if (info) free(info);
                info = "";
                infolen = 0;
                return(NULL);
        }
        if (infolen)
                info = (char *)realloc(info, infolen+n+1);
        else
                info = (char *)malloc(n+1);

        if (info == NULL)
                quiterr("out of memory in growInfo()");

        if (n > 0) memset(ns = info+infolen, 0, n+1);

        infolen += n;
        return(ns);
}

/* process header line (don't echo) */
int
headline(char *s, void *p)
{
        char    fmt[MAXFMTLEN];

        if (isheadid(s))                /* skip header magic ID */
                return(0);
        if (formatval(fmt, s)) {        /* check if format string */
                if (!strcmp(fmt,COLRFMT))
                        return(0);
                if (!strcmp(fmt,CIEFMT)) {
                        rgbinp = TM_XYZPRIM;
                        return(0);
                }
                if (!strcmp(fmt,SPECFMT))
                        return(0);
                return(-1);
        }
        if (isprims(s)) {               /* get input primaries */
                primsval(myinprims, s);
                rgbinp = myinprims;
                return(0);
        }
        if (isexpos(s))
                return(0);              /* ignore this on input */
        if (!strncmp(s, "GAMMA=", 6))
                return(0);              /* should not be here! */
        if (isncomp(s)) {
                NCSAMP = ncompval(s);
                return(0);
        }
        if (iswlsplit(s)) {
                wlsplitval(WLPART, s);
                return(0);
        }
        add2info(s);                    /* else save info string */
        return(1);
}

/* add BMP output color space to info string */
void
addBMPcspace(RGBPRIMP pp, double gamma)
{
        char    ibuf[128];

        if (pp != NULL) {
                sprintf(ibuf,
                        "%s %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f\n",
                                PRIMARYSTR,
                                pp[RED][CIEX],pp[RED][CIEY],
                                pp[GRN][CIEX],pp[GRN][CIEY],
                                pp[BLU][CIEX],pp[BLU][CIEY],
                                pp[WHT][CIEX],pp[WHT][CIEY]);
                add2info(ibuf);
        }
        sprintf(ibuf, "GAMMA=%.2f\n", gamma);
        add2info(ibuf);
}

/* write out Radiance header from BMP info string */
void
info2rad(char *infs, int len, FILE *fout)
{
        char    *cp;
                                        /* must fit metadata profile */
        if (len < 3 || infs[0] == '\n' ||
                        infs[--len] != '\0' || infs[len-1] != '\n')
                return;                 /* not what we expected */
        if (strlen(infs) < len || strstr(infs, "\n\n") != NULL)
                return;                 /* also not cool */
                                        /* check for gamma */
        if ((cp = strstr(infs, "GAMMA=")) != NULL) {
                                        /* copy what came before */
                fwrite(infs, cp-infs, 1, fout);
                cp += 6;
                gamcor = atof(cp);      /* record setting */
                while (*cp++ != '\n')
                        ;
                len -= cp - infs;
                infs = cp;              /* & elide from output */
        }
        fputs(infs, fout);              /* copy the remainder */
}

/* convert Radiance picture to BMP */
void
rad2bmp(FILE *rfp, BMPWriter *bwr, int inv, RGBPRIMP monpri)
{
        int     usexfm = 0;
        COLORMAT        xfm;
        COLR    *scanin;
        COLOR   cval;
        int     y, yend, ystp;
        int     x;
                                                /* allocate scanline */
        scanin = (COLR *)malloc(bwr->hdr->width*sizeof(COLR));
        if (scanin == NULL)
                quiterr("out of memory in rad2bmp");
                                                /* set up color conversion */
        usexfm = (monpri != NULL) ? (rgbinp != monpri) :
                        ((rgbinp != TM_XYZPRIM) & (rgbinp != stdprims));
        if (usexfm) {
                RGBPRIMP        destpri = monpri != NULL ? monpri : stdprims;
                double          expcomp = pow(2.0, (double)bradj);
                if (rgbinp == TM_XYZPRIM)
                        compxyz2rgbWBmat(xfm, destpri);
                else
                        comprgb2rgbWBmat(xfm, rgbinp, destpri);
                for (y = 0; y < 3; y++)
                        for (x = 0; x < 3; x++)
                                xfm[y][x] *= expcomp;
        }
                                                /* convert image */
        if (inv) {
                y = bwr->hdr->height - 1;
                ystp = -1; yend = -1;
        } else {
                y = 0;
                ystp = 1; yend = bwr->hdr->height;
        }
                                                /* convert each scanline */
        for ( ; y != yend; y += ystp) {
                if (fread2colrs(scanin, bwr->hdr->width, rfp, NCSAMP, WLPART) < 0)
                        quiterr("error reading Radiance picture");
                if (usexfm)
                        for (x = bwr->hdr->width; x--; ) {
                                colr_color(cval, scanin[x]);
                                colortrans(cval, xfm, cval);
                                setcolr(scanin[x], colval(cval,RED),
                                                colval(cval,GRN),
                                                colval(cval,BLU));
                        }
                else if (bradj)
                        shiftcolrs(scanin, bwr->hdr->width, bradj);
                if (monpri == NULL && rgbinp != TM_XYZPRIM)
                        for (x = bwr->hdr->width; x--; )
                                scanin[x][GRN] = normbright(scanin[x]);
                colrs_gambs(scanin, bwr->hdr->width);
                if (monpri == NULL)
                        for (x = bwr->hdr->width; x--; )
                                bwr->scanline[x] = scanin[x][GRN];
                else
                        for (x = bwr->hdr->width; x--; ) {
                                bwr->scanline[3*x] = scanin[x][BLU];
                                bwr->scanline[3*x+1] = scanin[x][GRN];
                                bwr->scanline[3*x+2] = scanin[x][RED];
                        }
                bwr->yscan = y;
                x = BMPwriteScanline(bwr);
                if (x != BIR_OK)
                        quiterr(BMPerrorMessage(x));
        }
        free(scanin);                           /* free scanline */
}

/* convert BMP file to Radiance */
void
bmp2rad(BMPReader *brd, FILE *rfp, int inv)
{
        COLR    *scanout;
        int     y, yend, ystp;
        int     x;
                                                /* allocate scanline */
        scanout = (COLR *)malloc(brd->hdr->width*sizeof(COLR));
        if (scanout == NULL)
                quiterr("out of memory in bmp2rad");
                                                /* convert image */
        if (inv) {
                y = brd->hdr->height - 1;
                ystp = -1; yend = -1;
        } else {
                y = 0;
                ystp = 1; yend = brd->hdr->height;
        }
                                                /* convert each scanline */
        for ( ; y != yend; y += ystp) {
                x = BMPseekScanline(y, brd);
                if (x != BIR_OK)
                        quiterr(BMPerrorMessage(x));
                for (x = brd->hdr->width; x--; ) {
                        RGBquad         rgbq = BMPdecodePixel(x, brd);
                        scanout[x][RED] = rgbq.r;
                        scanout[x][GRN] = rgbq.g;
                        scanout[x][BLU] = rgbq.b;
                }
                gambs_colrs(scanout, brd->hdr->width);
                if (bradj)
                        shiftcolrs(scanout, brd->hdr->width, bradj);
                if (fwritecolrs(scanout, brd->hdr->width, rfp) < 0)
                        quiterr("error writing Radiance picture");
        }
        free(scanout);                          /* clean up */
}

/* Tone-map and convert Radiance picture */
void
tmap2bmp(char *fnin, char *fnout, char *expec, RGBPRIMP monpri, double gamval)
{
        int             tmflags;
        BMPHeader       *hdr;
        BMPWriter       *wtr;
        FILE            *fp;
        int             xr, yr;
        uby8            *pa;
        int             i;
                                        /* check tone-mapping spec */
        i = strlen(expec);
        if (i && !strncmp(expec, "auto", i))
                tmflags = TM_F_CAMERA;
        else if (i && !strncmp(expec, "human", i))
                tmflags = TM_F_HUMAN & ~TM_F_UNIMPL;
        else if (i && !strncmp(expec, "linear", i))
                tmflags = TM_F_LINEAR;
        else
                quiterr("illegal exposure specification (auto|human|linear)");
        if (monpri == NULL) {
                tmflags |= TM_F_BW;
                monpri = stdprims;
        }
                                        /* open Radiance input */
        if (fnin == NULL)
                fp = stdin;
        else if ((fp = fopen(fnin, "r")) == NULL) {
                fprintf(stderr, "%s: cannot open\n", fnin);
                exit(1);
        }
                                        /* tone-map picture */
        if (tmMapPicture(&pa, &xr, &yr, tmflags, monpri, gamval,
                        0., 0., fnin, fp) != TM_E_OK)
                exit(1);
                                        /* try to retrieve info */
        if (fseek(fp, 0L, SEEK_SET) == 0)
                getheader(fp, headline, NULL);
                                        /* add output color space */
        addBMPcspace(monpri, gamval);
                                        /* initialize BMP header */
        if (tmflags & TM_F_BW) {
                hdr = BMPmappedHeader(xr, yr, infolen+1, 256);
                if (fnout != NULL)
                        hdr->compr = BI_RLE8;
        } else
                hdr = BMPtruecolorHeader(xr, yr, infolen+1);
        if (hdr == NULL)
                quiterr("cannot initialize BMP header");

        strcpy(BMPinfo(hdr), info);     /* copy info if any */
        clearInfo();
                                        /* open BMP output */
        if (fnout != NULL)
                wtr = BMPopenOutputFile(fnout, hdr);
        else
                wtr = BMPopenOutputStream(stdout, hdr);
        if (wtr == NULL)
                quiterr("cannot allocate writer structure");
                                        /* write to BMP file */
        while (wtr->yscan < yr) {
                uby8    *scn = pa + xr*((tmflags & TM_F_BW) ? 1 : 3)*
                                                (yr-1 - wtr->yscan);
                if (tmflags & TM_F_BW)
                        memcpy(wtr->scanline, scn, xr);
                else
                        for (i = xr; i--; ) {
                                wtr->scanline[3*i] = scn[3*i+BLU];
                                wtr->scanline[3*i+1] = scn[3*i+GRN];
                                wtr->scanline[3*i+2] = scn[3*i+RED];
                        }
                if ((i = BMPwriteScanline(wtr)) != BIR_OK)
                        quiterr(BMPerrorMessage(i));
        }
                                        /* flush output */
        if (fflush((FILE *)wtr->c_data) < 0)
                quiterr("error writing BMP output");
                                        /* clean up */
        if (fnin != NULL)
                fclose(fp);
        free(pa);
        BMPcloseOutput(wtr);
}
Revision:	2.18
Committed:	Sun Sep 14 04:39:53 2025 UTC (4 weeks, 2 days ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.17:	+134 -37 lines
Log Message:	feat(ra_bmp): Added metadata handling and i/o
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.18	static const char RCSid[] = "$Id: ra_bmp.c,v 2.17 2025/06/07 05:09:46 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* program to convert between RADIANCE and Windows BMP file
6			*/
7
8	greg	2.9	#include <math.h>
9	schorsch	2.3
10	greg	2.13	#include "rtio.h"
11	greg	2.1	#include "platform.h"
12			#include "color.h"
13	greg	2.4	#include "tonemap.h"
14	greg	2.1	#include "resolu.h"
15			#include "bmpfile.h"
16
17	greg	2.9	int bradj = 0; /* brightness adjustment */
18	greg	2.1
19	greg	2.9	double gamcor = 2.2; /* gamma correction value */
20	greg	2.1
21	greg	2.18	char info = ""; / information header string */
22			int infolen = 0; /* information header length */
23
24			extern void quiterr(const char *err);
25			extern void addBMPcspace(RGBPRIMP pp, double gamma);
26			extern void tmap2bmp(char fnin, char fnout, char *expec,
27	greg	2.4	RGBPRIMP monpri, double gamval);
28	greg	2.18	extern void rad2bmp(FILE rfp, BMPWriter bwr, int inv, RGBPRIMP monpri);
29			extern void bmp2rad(BMPReader brd, FILE rfp, int inv);
30			extern void info2rad(char infs, int len, FILE fout);
31			extern char *growInfo(int n);
32			extern gethfunc headline;
33	greg	2.1
34	greg	2.18	#define add2info(s) strcpy(growInfo(strlen(s)), s)
35			#define clearInfo() growInfo(-infolen)
36	greg	2.9
37	greg	2.18	RGBPRIMP rgbinp = stdprims; /* RGB input primitives */
38			RGBPRIMS myinprims; /* custom primitives holder */
39	greg	2.9
40	greg	2.1
41			int
42			main(int argc, char *argv[])
43			{
44	greg	2.4	char inpfile=NULL, outfile=NULL;
45			char *expec = NULL;
46			int reverse = 0;
47			RGBPRIMP rgbp = stdprims;
48			RGBPRIMS myprims;
49			RESOLU rs;
50			int i;
51	greg	2.1
52	greg	2.16	fixargv0(argv[0]); /* assigns progname */
53	greg	2.1
54			for (i = 1; i < argc; i++)
55	greg	2.6	if (argv[i][0] == '-' && argv[i][1])
56	greg	2.1	switch (argv[i][1]) {
57			case 'b':
58	greg	2.4	rgbp = NULL;
59	greg	2.1	break;
60			case 'g':
61			gamcor = atof(argv[++i]);
62			break;
63			case 'e':
64			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
65	greg	2.4	expec = argv[++i];
66			else
67			bradj = atoi(argv[++i]);
68			break;
69			case 'p':
70			if (argc-i < 9)
71	greg	2.1	goto userr;
72	greg	2.4	myprims[RED][CIEX] = atof(argv[++i]);
73			myprims[RED][CIEY] = atof(argv[++i]);
74			myprims[GRN][CIEX] = atof(argv[++i]);
75			myprims[GRN][CIEY] = atof(argv[++i]);
76			myprims[BLU][CIEX] = atof(argv[++i]);
77			myprims[BLU][CIEY] = atof(argv[++i]);
78			myprims[WHT][CIEX] = atof(argv[++i]);
79			myprims[WHT][CIEY] = atof(argv[++i]);
80			if (rgbp == stdprims)
81			rgbp = myprims;
82	greg	2.1	break;
83			case 'r':
84			reverse = !reverse;
85			break;
86			default:
87			goto userr;
88			}
89			else
90			break;
91
92			if (i < argc-2)
93			goto userr;
94
95			SET_FILE_BINARY(stdin);
96			SET_FILE_BINARY(stdout);
97			SET_DEFAULT_BINARY();
98
99			if (i <= argc-1 && strcmp(argv[i], "-"))
100			inpfile = argv[i];
101
102			if (i == argc-2 && strcmp(argv[i+1], "-"))
103			outfile = argv[i+1];
104	greg	2.18
105			if (expec != NULL) { /* check for tone-mapping */
106	greg	2.4	if (reverse)
107			goto userr;
108			tmap2bmp(inpfile, outfile, expec, rgbp, gamcor);
109			return(0);
110			}
111	greg	2.1	if (reverse) {
112			BMPReader *rdr;
113			/* open BMP file or stream */
114			if (inpfile != NULL)
115			rdr = BMPopenInputFile(inpfile);
116			else
117			rdr = BMPopenInputStream(stdin);
118
119			if (rdr == NULL) {
120			fprintf(stderr, "%s: cannot open or recognize BMP\n",
121			inpfile != NULL ? inpfile : "<stdin>");
122			exit(1);
123			}
124			/* open Radiance output */
125			if (outfile != NULL && freopen(outfile, "w", stdout) == NULL) {
126			fprintf(stderr, "%s: cannot open for output\n",
127			outfile);
128			exit(1);
129			}
130			/* put Radiance header */
131			newheader("RADIANCE", stdout);
132	greg	2.18	info2rad(BMPinfo(rdr->hdr), rdr->hdr->infoSiz, stdout);
133	greg	2.1	printargs(i, argv, stdout);
134			fputformat(COLRFMT, stdout);
135			putchar('\n');
136			rs.xr = rdr->hdr->width;
137			rs.yr = rdr->hdr->height;
138			rs.rt = YMAJOR;
139	greg	2.2	/* write scans downward if we can */
140	greg	2.1	if (rdr->hdr->yIsDown \|\| inpfile != NULL)
141			rs.rt \|= YDECR;
142			fputsresolu(&rs, stdout);
143	greg	2.18	/* set up conversion */
144			setcolrgam(gamcor);
145	greg	2.1	/* convert file */
146	greg	2.18	bmp2rad(rdr, stdout, !rdr->hdr->yIsDown & (inpfile!=NULL));
147	greg	2.1	/* flush output */
148	greg	2.2	BMPcloseInput(rdr);
149	greg	2.1	if (fflush(stdout) < 0)
150			quiterr("error writing Radiance output");
151			} else {
152			BMPHeader *hdr;
153			BMPWriter *wtr;
154			/* open Radiance input */
155			if (inpfile != NULL && freopen(inpfile, "r", stdin) == NULL) {
156			fprintf(stderr, "%s: cannot open input file\n",
157			inpfile);
158			exit(1);
159			}
160	greg	2.18	/* get/save header info. */
161	greg	2.9	if (getheader(stdin, headline, NULL) < 0 \|\|
162	greg	2.18	!fgetsresolu(&rs, stdin))
163	greg	2.1	quiterr("bad Radiance picture format");
164	greg	2.18	/* record color space */
165			addBMPcspace(rgbp, gamcor);
166			/* open output/write BMP header */
167	greg	2.4	if (rgbp == NULL) {
168			hdr = BMPmappedHeader(scanlen(&rs),
169	greg	2.18	numscans(&rs), infolen+1, 256);
170	greg	2.10	/*
171	greg	2.2	if (outfile != NULL)
172			hdr->compr = BI_RLE8;
173	greg	2.10	*/
174	greg	2.2	} else
175	greg	2.4	hdr = BMPtruecolorHeader(scanlen(&rs),
176	greg	2.18	numscans(&rs), infolen+1);
177	greg	2.1	if (hdr == NULL)
178	greg	2.18	quiterr("cannot create BMP output");
179			/* copy info to BMP header */
180			strcpy(BMPinfo(hdr), info);
181			clearInfo();
182	greg	2.2	/* set up output direction */
183	greg	2.7	hdr->yIsDown = ((outfile == NULL) \| (hdr->compr == BI_RLE8));
184	greg	2.1	/* open BMP output */
185			if (outfile != NULL)
186			wtr = BMPopenOutputFile(outfile, hdr);
187			else
188			wtr = BMPopenOutputStream(stdout, hdr);
189	greg	2.2	if (wtr == NULL)
190			quiterr("cannot allocate writer structure");
191	greg	2.18	/* set up conversion */
192			setcolrgam(gamcor);
193	greg	2.1	/* convert file */
194	greg	2.9	rad2bmp(stdin, wtr, !hdr->yIsDown, rgbp);
195	greg	2.1	/* flush output */
196			if (fflush((FILE *)wtr->c_data) < 0)
197			quiterr("error writing BMP output");
198	greg	2.2	BMPcloseOutput(wtr);
199	greg	2.1	}
200	greg	2.4	return(0); /* success */
201	greg	2.1	userr:
202			fprintf(stderr,
203	greg	2.4	"Usage: %s [-b][-g gamma][-e spec][-p xr yr xg yg xb yb xw yw] [input\|- [output]]\n",
204	greg	2.1	progname);
205	greg	2.4	fprintf(stderr,
206			" or: %s -r [-g gamma][-e +/-stops] [input\|- [output]]\n",
207			progname);
208			return(1);
209	greg	2.1	}
210
211			/* print message and exit */
212	greg	2.18	void
213	greg	2.1	quiterr(const char *err)
214			{
215			if (err != NULL) {
216			fprintf(stderr, "%s: %s\n", progname, err);
217			exit(1);
218			}
219			exit(0);
220			}
221
222	greg	2.18	/* grow (or shrink) saved info header string */
223			char *
224			growInfo(int n)
225			{
226			char *ns = NULL;
227
228			if (infolen + n <= 0) {
229			if (info) free(info);
230			info = "";
231			infolen = 0;
232			return(NULL);
233			}
234			if (infolen)
235			info = (char *)realloc(info, infolen+n+1);
236			else
237			info = (char *)malloc(n+1);
238
239			if (info == NULL)
240			quiterr("out of memory in growInfo()");
241
242			if (n > 0) memset(ns = info+infolen, 0, n+1);
243
244			infolen += n;
245			return(ns);
246			}
247
248	greg	2.9	/* process header line (don't echo) */
249	greg	2.18	int
250	greg	2.9	headline(char s, void p)
251			{
252	greg	2.12	char fmt[MAXFMTLEN];
253	greg	2.9
254	greg	2.18	if (isheadid(s)) /* skip header magic ID */
255			return(0);
256	greg	2.9	if (formatval(fmt, s)) { /* check if format string */
257			if (!strcmp(fmt,COLRFMT))
258			return(0);
259			if (!strcmp(fmt,CIEFMT)) {
260			rgbinp = TM_XYZPRIM;
261			return(0);
262			}
263	greg	2.15	if (!strcmp(fmt,SPECFMT))
264			return(0);
265	greg	2.9	return(-1);
266			}
267			if (isprims(s)) { /* get input primaries */
268			primsval(myinprims, s);
269			rgbinp = myinprims;
270			return(0);
271			}
272	greg	2.18	if (isexpos(s))
273			return(0); /* ignore this on input */
274			if (!strncmp(s, "GAMMA=", 6))
275			return(0); /* should not be here! */
276	greg	2.15	if (isncomp(s)) {
277			NCSAMP = ncompval(s);
278			return(0);
279			}
280			if (iswlsplit(s)) {
281			wlsplitval(WLPART, s);
282			return(0);
283			}
284	greg	2.18	add2info(s); /* else save info string */
285			return(1);
286	greg	2.9	}
287
288	greg	2.18	/* add BMP output color space to info string */
289			void
290			addBMPcspace(RGBPRIMP pp, double gamma)
291			{
292			char ibuf[128];
293
294			if (pp != NULL) {
295			sprintf(ibuf,
296			"%s %.4f %.4f %.4f %.4f %.4f %.4f %.4f %.4f\n",
297			PRIMARYSTR,
298			pp[RED][CIEX],pp[RED][CIEY],
299			pp[GRN][CIEX],pp[GRN][CIEY],
300			pp[BLU][CIEX],pp[BLU][CIEY],
301			pp[WHT][CIEX],pp[WHT][CIEY]);
302			add2info(ibuf);
303			}
304			sprintf(ibuf, "GAMMA=%.2f\n", gamma);
305			add2info(ibuf);
306			}
307
308			/* write out Radiance header from BMP info string */
309			void
310			info2rad(char infs, int len, FILE fout)
311			{
312			char *cp;
313			/* must fit metadata profile */
314			if (len < 3 \|\| infs[0] == '\n' \|\|
315			infs[--len] != '\0' \|\| infs[len-1] != '\n')
316			return; /* not what we expected */
317			if (strlen(infs) < len \|\| strstr(infs, "\n\n") != NULL)
318			return; /* also not cool */
319			/* check for gamma */
320			if ((cp = strstr(infs, "GAMMA=")) != NULL) {
321			/* copy what came before */
322			fwrite(infs, cp-infs, 1, fout);
323			cp += 6;
324			gamcor = atof(cp); /* record setting */
325			while (*cp++ != '\n')
326			;
327			len -= cp - infs;
328			infs = cp; /* & elide from output */
329			}
330			fputs(infs, fout); /* copy the remainder */
331			}
332	greg	2.9
333	greg	2.1	/* convert Radiance picture to BMP */
334	greg	2.18	void
335	greg	2.9	rad2bmp(FILE rfp, BMPWriter bwr, int inv, RGBPRIMP monpri)
336	greg	2.1	{
337	greg	2.9	int usexfm = 0;
338			COLORMAT xfm;
339	greg	2.1	COLR *scanin;
340	greg	2.9	COLOR cval;
341	greg	2.1	int y, yend, ystp;
342			int x;
343			/* allocate scanline */
344			scanin = (COLR )malloc(bwr->hdr->widthsizeof(COLR));
345			if (scanin == NULL)
346			quiterr("out of memory in rad2bmp");
347	greg	2.9	/* set up color conversion */
348	greg	2.18	usexfm = (monpri != NULL) ? (rgbinp != monpri) :
349			((rgbinp != TM_XYZPRIM) & (rgbinp != stdprims));
350	greg	2.9	if (usexfm) {
351	greg	2.14	RGBPRIMP destpri = monpri != NULL ? monpri : stdprims;
352			double expcomp = pow(2.0, (double)bradj);
353	greg	2.9	if (rgbinp == TM_XYZPRIM)
354	greg	2.14	compxyz2rgbWBmat(xfm, destpri);
355	greg	2.9	else
356	greg	2.14	comprgb2rgbWBmat(xfm, rgbinp, destpri);
357	greg	2.9	for (y = 0; y < 3; y++)
358			for (x = 0; x < 3; x++)
359			xfm[y][x] *= expcomp;
360			}
361	greg	2.1	/* convert image */
362			if (inv) {
363			y = bwr->hdr->height - 1;
364			ystp = -1; yend = -1;
365			} else {
366			y = 0;
367			ystp = 1; yend = bwr->hdr->height;
368			}
369			/* convert each scanline */
370			for ( ; y != yend; y += ystp) {
371	greg	2.15	if (fread2colrs(scanin, bwr->hdr->width, rfp, NCSAMP, WLPART) < 0)
372	greg	2.1	quiterr("error reading Radiance picture");
373	greg	2.9	if (usexfm)
374			for (x = bwr->hdr->width; x--; ) {
375			colr_color(cval, scanin[x]);
376			colortrans(cval, xfm, cval);
377			setcolr(scanin[x], colval(cval,RED),
378			colval(cval,GRN),
379			colval(cval,BLU));
380			}
381			else if (bradj)
382	greg	2.1	shiftcolrs(scanin, bwr->hdr->width, bradj);
383	greg	2.9	if (monpri == NULL && rgbinp != TM_XYZPRIM)
384			for (x = bwr->hdr->width; x--; )
385			scanin[x][GRN] = normbright(scanin[x]);
386	greg	2.1	colrs_gambs(scanin, bwr->hdr->width);
387	greg	2.9	if (monpri == NULL)
388	greg	2.1	for (x = bwr->hdr->width; x--; )
389			bwr->scanline[x] = scanin[x][GRN];
390			else
391			for (x = bwr->hdr->width; x--; ) {
392			bwr->scanline[3*x] = scanin[x][BLU];
393			bwr->scanline[3*x+1] = scanin[x][GRN];
394			bwr->scanline[3*x+2] = scanin[x][RED];
395			}
396			bwr->yscan = y;
397			x = BMPwriteScanline(bwr);
398			if (x != BIR_OK)
399			quiterr(BMPerrorMessage(x));
400			}
401	greg	2.18	free(scanin); /* free scanline */
402	greg	2.1	}
403
404			/* convert BMP file to Radiance */
405	greg	2.18	void
406	greg	2.1	bmp2rad(BMPReader brd, FILE rfp, int inv)
407			{
408			COLR *scanout;
409			int y, yend, ystp;
410			int x;
411			/* allocate scanline */
412			scanout = (COLR )malloc(brd->hdr->widthsizeof(COLR));
413			if (scanout == NULL)
414			quiterr("out of memory in bmp2rad");
415			/* convert image */
416			if (inv) {
417			y = brd->hdr->height - 1;
418			ystp = -1; yend = -1;
419			} else {
420			y = 0;
421			ystp = 1; yend = brd->hdr->height;
422			}
423			/* convert each scanline */
424			for ( ; y != yend; y += ystp) {
425			x = BMPseekScanline(y, brd);
426			if (x != BIR_OK)
427			quiterr(BMPerrorMessage(x));
428			for (x = brd->hdr->width; x--; ) {
429			RGBquad rgbq = BMPdecodePixel(x, brd);
430			scanout[x][RED] = rgbq.r;
431			scanout[x][GRN] = rgbq.g;
432			scanout[x][BLU] = rgbq.b;
433			}
434			gambs_colrs(scanout, brd->hdr->width);
435			if (bradj)
436			shiftcolrs(scanout, brd->hdr->width, bradj);
437			if (fwritecolrs(scanout, brd->hdr->width, rfp) < 0)
438			quiterr("error writing Radiance picture");
439			}
440	greg	2.18	free(scanout); /* clean up */
441	greg	2.1	}
442	greg	2.4
443			/* Tone-map and convert Radiance picture */
444	greg	2.18	void
445	greg	2.4	tmap2bmp(char fnin, char fnout, char *expec, RGBPRIMP monpri, double gamval)
446			{
447			int tmflags;
448			BMPHeader *hdr;
449			BMPWriter *wtr;
450			FILE *fp;
451			int xr, yr;
452	greg	2.11	uby8 *pa;
453	greg	2.4	int i;
454			/* check tone-mapping spec */
455			i = strlen(expec);
456			if (i && !strncmp(expec, "auto", i))
457			tmflags = TM_F_CAMERA;
458			else if (i && !strncmp(expec, "human", i))
459			tmflags = TM_F_HUMAN & ~TM_F_UNIMPL;
460			else if (i && !strncmp(expec, "linear", i))
461			tmflags = TM_F_LINEAR;
462			else
463			quiterr("illegal exposure specification (auto\|human\|linear)");
464			if (monpri == NULL) {
465			tmflags \|= TM_F_BW;
466			monpri = stdprims;
467			}
468			/* open Radiance input */
469			if (fnin == NULL)
470			fp = stdin;
471			else if ((fp = fopen(fnin, "r")) == NULL) {
472			fprintf(stderr, "%s: cannot open\n", fnin);
473			exit(1);
474			}
475			/* tone-map picture */
476			if (tmMapPicture(&pa, &xr, &yr, tmflags, monpri, gamval,
477			0., 0., fnin, fp) != TM_E_OK)
478			exit(1);
479	greg	2.18	/* try to retrieve info */
480			if (fseek(fp, 0L, SEEK_SET) == 0)
481			getheader(fp, headline, NULL);
482			/* add output color space */
483			addBMPcspace(monpri, gamval);
484	greg	2.4	/* initialize BMP header */
485			if (tmflags & TM_F_BW) {
486	greg	2.18	hdr = BMPmappedHeader(xr, yr, infolen+1, 256);
487	greg	2.5	if (fnout != NULL)
488			hdr->compr = BI_RLE8;
489	greg	2.4	} else
490	greg	2.18	hdr = BMPtruecolorHeader(xr, yr, infolen+1);
491	greg	2.4	if (hdr == NULL)
492			quiterr("cannot initialize BMP header");
493	greg	2.18
494			strcpy(BMPinfo(hdr), info); /* copy info if any */
495			clearInfo();
496	greg	2.4	/* open BMP output */
497			if (fnout != NULL)
498			wtr = BMPopenOutputFile(fnout, hdr);
499			else
500			wtr = BMPopenOutputStream(stdout, hdr);
501			if (wtr == NULL)
502			quiterr("cannot allocate writer structure");
503			/* write to BMP file */
504			while (wtr->yscan < yr) {
505	greg	2.11	uby8 scn = pa + xr((tmflags & TM_F_BW) ? 1 : 3)*
506	greg	2.7	(yr-1 - wtr->yscan);
507	greg	2.4	if (tmflags & TM_F_BW)
508	greg	2.18	memcpy(wtr->scanline, scn, xr);
509	greg	2.4	else
510			for (i = xr; i--; ) {
511			wtr->scanline[3i] = scn[3i+BLU];
512			wtr->scanline[3i+1] = scn[3i+GRN];
513			wtr->scanline[3i+2] = scn[3i+RED];
514			}
515			if ((i = BMPwriteScanline(wtr)) != BIR_OK)
516			quiterr(BMPerrorMessage(i));
517			}
518			/* flush output */
519			if (fflush((FILE *)wtr->c_data) < 0)
520			quiterr("error writing BMP output");
521			/* clean up */
522	greg	2.8	if (fnin != NULL)
523			fclose(fp);
524	greg	2.18	free(pa);
525	greg	2.4	BMPcloseOutput(wtr);
526			}