src/px/ra_bmp.c

#ifndef lint
static const char RCSid[] = "$Id: ra_bmp.c,v 2.16 2025/06/06 19:11:21 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 */

static void quiterr(const char *err);
static void tmap2bmp(char *fnin, char *fnout, char *expec,
                                RGBPRIMP monpri, double gamval);
static void rad2bmp(FILE *rfp, BMPWriter *bwr, int inv, RGBPRIMP monpri);
static void bmp2rad(BMPReader *brd, FILE *rfp, int inv);

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

static gethfunc headline;


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];
                                        /* check for tone-mapping */
        if (expec != NULL) {
                if (reverse)
                        goto userr;
                tmap2bmp(inpfile, outfile, expec, rgbp, gamcor);
                return(0);
        }

        setcolrgam(gamcor);             /* set up conversion */

        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);
                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);
                                        /* 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 header info. */
                if (getheader(stdin, headline, NULL) < 0 ||
                                !fgetsresolu(&rs, stdin))
                        quiterr("bad Radiance picture format");
                                        /* initialize BMP header */
                if (rgbp == NULL) {
                        hdr = BMPmappedHeader(scanlen(&rs),
                                                numscans(&rs), 0, 256);
                        /*
                        if (outfile != NULL)
                                hdr->compr = BI_RLE8;
                        */
                } else
                        hdr = BMPtruecolorHeader(scanlen(&rs),
                                                numscans(&rs), 0);
                if (hdr == NULL)
                        quiterr("cannot initialize BMP header");
                                        /* 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");
                                        /* 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 */
static void
quiterr(const char *err)
{
        if (err != NULL) {
                fprintf(stderr, "%s: %s\n", progname, err);
                exit(1);
        }
        exit(0);
}

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

        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 (isncomp(s)) {
                NCSAMP = ncompval(s);
                return(0);
        }
        if (iswlsplit(s)) {
                wlsplitval(WLPART, s);
                return(0);
        }
                                        /* should I grok colcorr also? */
        return(0);
}


/* convert Radiance picture to BMP */
static 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 scanline */
        free((void *)scanin);
}

/* convert BMP file to Radiance */
static 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");
        }
                                                /* clean up */
        free((void *)scanout);
}

/* Tone-map and convert Radiance picture */
static 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);
                                        /* initialize BMP header */
        if (tmflags & TM_F_BW) {
                hdr = BMPmappedHeader(xr, yr, 0, 256);
                if (fnout != NULL)
                        hdr->compr = BI_RLE8;
        } else
                hdr = BMPtruecolorHeader(xr, yr, 0);
        if (hdr == NULL)
                quiterr("cannot initialize BMP header");
                                        /* 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((void *)wtr->scanline, (void *)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((void *)pa);
        BMPcloseOutput(wtr);
}
Revision:	2.17
Committed:	Sat Jun 7 05:09:46 2025 UTC (2 weeks, 1 day ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 2.16:	+1 -2 lines
Log Message:	refactor: Put some declarations into "paths.h" and included in "platform.h"
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.17	static const char RCSid[] = "$Id: ra_bmp.c,v 2.16 2025/06/06 19:11:21 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	2.4	static void quiterr(const char *err);
22			static void tmap2bmp(char fnin, char fnout, char *expec,
23			RGBPRIMP monpri, double gamval);
24	greg	2.9	static void rad2bmp(FILE rfp, BMPWriter bwr, int inv, RGBPRIMP monpri);
25	schorsch	2.3	static void bmp2rad(BMPReader brd, FILE rfp, int inv);
26	greg	2.1
27	greg	2.9	static RGBPRIMP rgbinp = stdprims; /* RGB input primitives */
28			static RGBPRIMS myinprims; /* custom primitives holder */
29
30			static gethfunc headline;
31
32	greg	2.1
33			int
34			main(int argc, char *argv[])
35			{
36	greg	2.4	char inpfile=NULL, outfile=NULL;
37			char *expec = NULL;
38			int reverse = 0;
39			RGBPRIMP rgbp = stdprims;
40			RGBPRIMS myprims;
41			RESOLU rs;
42			int i;
43	greg	2.1
44	greg	2.16	fixargv0(argv[0]); /* assigns progname */
45	greg	2.1
46			for (i = 1; i < argc; i++)
47	greg	2.6	if (argv[i][0] == '-' && argv[i][1])
48	greg	2.1	switch (argv[i][1]) {
49			case 'b':
50	greg	2.4	rgbp = NULL;
51	greg	2.1	break;
52			case 'g':
53			gamcor = atof(argv[++i]);
54			break;
55			case 'e':
56			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
57	greg	2.4	expec = argv[++i];
58			else
59			bradj = atoi(argv[++i]);
60			break;
61			case 'p':
62			if (argc-i < 9)
63	greg	2.1	goto userr;
64	greg	2.4	myprims[RED][CIEX] = atof(argv[++i]);
65			myprims[RED][CIEY] = atof(argv[++i]);
66			myprims[GRN][CIEX] = atof(argv[++i]);
67			myprims[GRN][CIEY] = atof(argv[++i]);
68			myprims[BLU][CIEX] = atof(argv[++i]);
69			myprims[BLU][CIEY] = atof(argv[++i]);
70			myprims[WHT][CIEX] = atof(argv[++i]);
71			myprims[WHT][CIEY] = atof(argv[++i]);
72			if (rgbp == stdprims)
73			rgbp = myprims;
74	greg	2.1	break;
75			case 'r':
76			reverse = !reverse;
77			break;
78			default:
79			goto userr;
80			}
81			else
82			break;
83
84			if (i < argc-2)
85			goto userr;
86
87			SET_FILE_BINARY(stdin);
88			SET_FILE_BINARY(stdout);
89			SET_DEFAULT_BINARY();
90
91			if (i <= argc-1 && strcmp(argv[i], "-"))
92			inpfile = argv[i];
93
94			if (i == argc-2 && strcmp(argv[i+1], "-"))
95			outfile = argv[i+1];
96	greg	2.4	/* check for tone-mapping */
97			if (expec != NULL) {
98			if (reverse)
99			goto userr;
100			tmap2bmp(inpfile, outfile, expec, rgbp, gamcor);
101			return(0);
102			}
103	greg	2.1
104			setcolrgam(gamcor); /* set up conversion */
105
106			if (reverse) {
107			BMPReader *rdr;
108			/* open BMP file or stream */
109			if (inpfile != NULL)
110			rdr = BMPopenInputFile(inpfile);
111			else
112			rdr = BMPopenInputStream(stdin);
113
114			if (rdr == NULL) {
115			fprintf(stderr, "%s: cannot open or recognize BMP\n",
116			inpfile != NULL ? inpfile : "<stdin>");
117			exit(1);
118			}
119			/* open Radiance output */
120			if (outfile != NULL && freopen(outfile, "w", stdout) == NULL) {
121			fprintf(stderr, "%s: cannot open for output\n",
122			outfile);
123			exit(1);
124			}
125			/* put Radiance header */
126			newheader("RADIANCE", stdout);
127			printargs(i, argv, stdout);
128			fputformat(COLRFMT, stdout);
129			putchar('\n');
130			rs.xr = rdr->hdr->width;
131			rs.yr = rdr->hdr->height;
132			rs.rt = YMAJOR;
133	greg	2.2	/* write scans downward if we can */
134	greg	2.1	if (rdr->hdr->yIsDown \|\| inpfile != NULL)
135			rs.rt \|= YDECR;
136			fputsresolu(&rs, stdout);
137			/* convert file */
138			bmp2rad(rdr, stdout, !rdr->hdr->yIsDown && inpfile!=NULL);
139			/* flush output */
140	greg	2.2	BMPcloseInput(rdr);
141	greg	2.1	if (fflush(stdout) < 0)
142			quiterr("error writing Radiance output");
143			} else {
144			BMPHeader *hdr;
145			BMPWriter *wtr;
146			/* open Radiance input */
147			if (inpfile != NULL && freopen(inpfile, "r", stdin) == NULL) {
148			fprintf(stderr, "%s: cannot open input file\n",
149			inpfile);
150			exit(1);
151			}
152			/* get header info. */
153	greg	2.9	if (getheader(stdin, headline, NULL) < 0 \|\|
154	greg	2.1	!fgetsresolu(&rs, stdin))
155			quiterr("bad Radiance picture format");
156			/* initialize BMP header */
157	greg	2.4	if (rgbp == NULL) {
158			hdr = BMPmappedHeader(scanlen(&rs),
159			numscans(&rs), 0, 256);
160	greg	2.10	/*
161	greg	2.2	if (outfile != NULL)
162			hdr->compr = BI_RLE8;
163	greg	2.10	*/
164	greg	2.2	} else
165	greg	2.4	hdr = BMPtruecolorHeader(scanlen(&rs),
166			numscans(&rs), 0);
167	greg	2.1	if (hdr == NULL)
168			quiterr("cannot initialize BMP header");
169	greg	2.2	/* set up output direction */
170	greg	2.7	hdr->yIsDown = ((outfile == NULL) \| (hdr->compr == BI_RLE8));
171	greg	2.1	/* open BMP output */
172			if (outfile != NULL)
173			wtr = BMPopenOutputFile(outfile, hdr);
174			else
175			wtr = BMPopenOutputStream(stdout, hdr);
176	greg	2.2	if (wtr == NULL)
177			quiterr("cannot allocate writer structure");
178	greg	2.1	/* convert file */
179	greg	2.9	rad2bmp(stdin, wtr, !hdr->yIsDown, rgbp);
180	greg	2.1	/* flush output */
181			if (fflush((FILE *)wtr->c_data) < 0)
182			quiterr("error writing BMP output");
183	greg	2.2	BMPcloseOutput(wtr);
184	greg	2.1	}
185	greg	2.4	return(0); /* success */
186	greg	2.1	userr:
187			fprintf(stderr,
188	greg	2.4	"Usage: %s [-b][-g gamma][-e spec][-p xr yr xg yg xb yb xw yw] [input\|- [output]]\n",
189	greg	2.1	progname);
190	greg	2.4	fprintf(stderr,
191			" or: %s -r [-g gamma][-e +/-stops] [input\|- [output]]\n",
192			progname);
193			return(1);
194	greg	2.1	}
195
196			/* print message and exit */
197	schorsch	2.3	static void
198	greg	2.1	quiterr(const char *err)
199			{
200			if (err != NULL) {
201			fprintf(stderr, "%s: %s\n", progname, err);
202			exit(1);
203			}
204			exit(0);
205			}
206
207	greg	2.9	/* process header line (don't echo) */
208			static int
209			headline(char s, void p)
210			{
211	greg	2.12	char fmt[MAXFMTLEN];
212	greg	2.9
213			if (formatval(fmt, s)) { /* check if format string */
214			if (!strcmp(fmt,COLRFMT))
215			return(0);
216			if (!strcmp(fmt,CIEFMT)) {
217			rgbinp = TM_XYZPRIM;
218			return(0);
219			}
220	greg	2.15	if (!strcmp(fmt,SPECFMT))
221			return(0);
222	greg	2.9	return(-1);
223			}
224			if (isprims(s)) { /* get input primaries */
225			primsval(myinprims, s);
226			rgbinp = myinprims;
227			return(0);
228			}
229	greg	2.15	if (isncomp(s)) {
230			NCSAMP = ncompval(s);
231			return(0);
232			}
233			if (iswlsplit(s)) {
234			wlsplitval(WLPART, s);
235			return(0);
236			}
237	greg	2.9	/* should I grok colcorr also? */
238			return(0);
239			}
240
241
242	greg	2.1	/* convert Radiance picture to BMP */
243	schorsch	2.3	static void
244	greg	2.9	rad2bmp(FILE rfp, BMPWriter bwr, int inv, RGBPRIMP monpri)
245	greg	2.1	{
246	greg	2.9	int usexfm = 0;
247			COLORMAT xfm;
248	greg	2.1	COLR *scanin;
249	greg	2.9	COLOR cval;
250	greg	2.1	int y, yend, ystp;
251			int x;
252			/* allocate scanline */
253			scanin = (COLR )malloc(bwr->hdr->widthsizeof(COLR));
254			if (scanin == NULL)
255			quiterr("out of memory in rad2bmp");
256	greg	2.9	/* set up color conversion */
257			usexfm = (monpri != NULL ? rgbinp != monpri :
258			rgbinp != TM_XYZPRIM && rgbinp != stdprims);
259			if (usexfm) {
260	greg	2.14	RGBPRIMP destpri = monpri != NULL ? monpri : stdprims;
261			double expcomp = pow(2.0, (double)bradj);
262	greg	2.9	if (rgbinp == TM_XYZPRIM)
263	greg	2.14	compxyz2rgbWBmat(xfm, destpri);
264	greg	2.9	else
265	greg	2.14	comprgb2rgbWBmat(xfm, rgbinp, destpri);
266	greg	2.9	for (y = 0; y < 3; y++)
267			for (x = 0; x < 3; x++)
268			xfm[y][x] *= expcomp;
269			}
270	greg	2.1	/* convert image */
271			if (inv) {
272			y = bwr->hdr->height - 1;
273			ystp = -1; yend = -1;
274			} else {
275			y = 0;
276			ystp = 1; yend = bwr->hdr->height;
277			}
278			/* convert each scanline */
279			for ( ; y != yend; y += ystp) {
280	greg	2.15	if (fread2colrs(scanin, bwr->hdr->width, rfp, NCSAMP, WLPART) < 0)
281	greg	2.1	quiterr("error reading Radiance picture");
282	greg	2.9	if (usexfm)
283			for (x = bwr->hdr->width; x--; ) {
284			colr_color(cval, scanin[x]);
285			colortrans(cval, xfm, cval);
286			setcolr(scanin[x], colval(cval,RED),
287			colval(cval,GRN),
288			colval(cval,BLU));
289			}
290			else if (bradj)
291	greg	2.1	shiftcolrs(scanin, bwr->hdr->width, bradj);
292	greg	2.9	if (monpri == NULL && rgbinp != TM_XYZPRIM)
293			for (x = bwr->hdr->width; x--; )
294			scanin[x][GRN] = normbright(scanin[x]);
295	greg	2.1	colrs_gambs(scanin, bwr->hdr->width);
296	greg	2.9	if (monpri == NULL)
297	greg	2.1	for (x = bwr->hdr->width; x--; )
298			bwr->scanline[x] = scanin[x][GRN];
299			else
300			for (x = bwr->hdr->width; x--; ) {
301			bwr->scanline[3*x] = scanin[x][BLU];
302			bwr->scanline[3*x+1] = scanin[x][GRN];
303			bwr->scanline[3*x+2] = scanin[x][RED];
304			}
305			bwr->yscan = y;
306			x = BMPwriteScanline(bwr);
307			if (x != BIR_OK)
308			quiterr(BMPerrorMessage(x));
309			}
310			/* free scanline */
311			free((void *)scanin);
312			}
313
314			/* convert BMP file to Radiance */
315	schorsch	2.3	static void
316	greg	2.1	bmp2rad(BMPReader brd, FILE rfp, int inv)
317			{
318			COLR *scanout;
319			int y, yend, ystp;
320			int x;
321			/* allocate scanline */
322			scanout = (COLR )malloc(brd->hdr->widthsizeof(COLR));
323			if (scanout == NULL)
324			quiterr("out of memory in bmp2rad");
325			/* convert image */
326			if (inv) {
327			y = brd->hdr->height - 1;
328			ystp = -1; yend = -1;
329			} else {
330			y = 0;
331			ystp = 1; yend = brd->hdr->height;
332			}
333			/* convert each scanline */
334			for ( ; y != yend; y += ystp) {
335			x = BMPseekScanline(y, brd);
336			if (x != BIR_OK)
337			quiterr(BMPerrorMessage(x));
338			for (x = brd->hdr->width; x--; ) {
339			RGBquad rgbq = BMPdecodePixel(x, brd);
340			scanout[x][RED] = rgbq.r;
341			scanout[x][GRN] = rgbq.g;
342			scanout[x][BLU] = rgbq.b;
343			}
344			gambs_colrs(scanout, brd->hdr->width);
345			if (bradj)
346			shiftcolrs(scanout, brd->hdr->width, bradj);
347			if (fwritecolrs(scanout, brd->hdr->width, rfp) < 0)
348			quiterr("error writing Radiance picture");
349			}
350			/* clean up */
351			free((void *)scanout);
352			}
353	greg	2.4
354			/* Tone-map and convert Radiance picture */
355			static void
356			tmap2bmp(char fnin, char fnout, char *expec, RGBPRIMP monpri, double gamval)
357			{
358			int tmflags;
359			BMPHeader *hdr;
360			BMPWriter *wtr;
361			FILE *fp;
362			int xr, yr;
363	greg	2.11	uby8 *pa;
364	greg	2.4	int i;
365			/* check tone-mapping spec */
366			i = strlen(expec);
367			if (i && !strncmp(expec, "auto", i))
368			tmflags = TM_F_CAMERA;
369			else if (i && !strncmp(expec, "human", i))
370			tmflags = TM_F_HUMAN & ~TM_F_UNIMPL;
371			else if (i && !strncmp(expec, "linear", i))
372			tmflags = TM_F_LINEAR;
373			else
374			quiterr("illegal exposure specification (auto\|human\|linear)");
375			if (monpri == NULL) {
376			tmflags \|= TM_F_BW;
377			monpri = stdprims;
378			}
379			/* open Radiance input */
380			if (fnin == NULL)
381			fp = stdin;
382			else if ((fp = fopen(fnin, "r")) == NULL) {
383			fprintf(stderr, "%s: cannot open\n", fnin);
384			exit(1);
385			}
386			/* tone-map picture */
387			if (tmMapPicture(&pa, &xr, &yr, tmflags, monpri, gamval,
388			0., 0., fnin, fp) != TM_E_OK)
389			exit(1);
390			/* initialize BMP header */
391			if (tmflags & TM_F_BW) {
392			hdr = BMPmappedHeader(xr, yr, 0, 256);
393	greg	2.5	if (fnout != NULL)
394			hdr->compr = BI_RLE8;
395	greg	2.4	} else
396			hdr = BMPtruecolorHeader(xr, yr, 0);
397			if (hdr == NULL)
398			quiterr("cannot initialize BMP header");
399			/* open BMP output */
400			if (fnout != NULL)
401			wtr = BMPopenOutputFile(fnout, hdr);
402			else
403			wtr = BMPopenOutputStream(stdout, hdr);
404			if (wtr == NULL)
405			quiterr("cannot allocate writer structure");
406			/* write to BMP file */
407			while (wtr->yscan < yr) {
408	greg	2.11	uby8 scn = pa + xr((tmflags & TM_F_BW) ? 1 : 3)*
409	greg	2.7	(yr-1 - wtr->yscan);
410	greg	2.4	if (tmflags & TM_F_BW)
411			memcpy((void )wtr->scanline, (void )scn, xr);
412			else
413			for (i = xr; i--; ) {
414			wtr->scanline[3i] = scn[3i+BLU];
415			wtr->scanline[3i+1] = scn[3i+GRN];
416			wtr->scanline[3i+2] = scn[3i+RED];
417			}
418			if ((i = BMPwriteScanline(wtr)) != BIR_OK)
419			quiterr(BMPerrorMessage(i));
420			}
421			/* flush output */
422			if (fflush((FILE *)wtr->c_data) < 0)
423			quiterr("error writing BMP output");
424			/* clean up */
425	greg	2.8	if (fnin != NULL)
426			fclose(fp);
427	greg	2.4	free((void *)pa);
428			BMPcloseOutput(wtr);
429			}