src/px/ra_bmp.c

#ifndef lint
static const char RCSid[] = "$Id: ra_bmp.c,v 2.14 2020/04/05 19:10:51 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            *progname;

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;
        
        progname = argv[0];

        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:	2.15
Committed:	Tue Sep 10 20:24:42 2024 UTC (7 months, 3 weeks ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	HEAD
Changes since 2.14:	+12 -2 lines
Log Message:	feat(ra_bmp,ra_rgbe,ximage): Added quick conversion of spectral inputs to RGB
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.15	static const char RCSid[] = "$Id: ra_bmp.c,v 2.14 2020/04/05 19:10:51 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	2.9	char *progname;
22	greg	2.1
23	greg	2.4	static void quiterr(const char *err);
24			static void tmap2bmp(char fnin, char fnout, char *expec,
25			RGBPRIMP monpri, double gamval);
26	greg	2.9	static void rad2bmp(FILE rfp, BMPWriter bwr, int inv, RGBPRIMP monpri);
27	schorsch	2.3	static void bmp2rad(BMPReader brd, FILE rfp, int inv);
28	greg	2.1
29	greg	2.9	static RGBPRIMP rgbinp = stdprims; /* RGB input primitives */
30			static RGBPRIMS myinprims; /* custom primitives holder */
31
32			static gethfunc headline;
33
34	greg	2.1
35			int
36			main(int argc, char *argv[])
37			{
38	greg	2.4	char inpfile=NULL, outfile=NULL;
39			char *expec = NULL;
40			int reverse = 0;
41			RGBPRIMP rgbp = stdprims;
42			RGBPRIMS myprims;
43			RESOLU rs;
44			int i;
45	greg	2.1
46			progname = argv[0];
47
48			for (i = 1; i < argc; i++)
49	greg	2.6	if (argv[i][0] == '-' && argv[i][1])
50	greg	2.1	switch (argv[i][1]) {
51			case 'b':
52	greg	2.4	rgbp = NULL;
53	greg	2.1	break;
54			case 'g':
55			gamcor = atof(argv[++i]);
56			break;
57			case 'e':
58			if (argv[i+1][0] != '+' && argv[i+1][0] != '-')
59	greg	2.4	expec = argv[++i];
60			else
61			bradj = atoi(argv[++i]);
62			break;
63			case 'p':
64			if (argc-i < 9)
65	greg	2.1	goto userr;
66	greg	2.4	myprims[RED][CIEX] = atof(argv[++i]);
67			myprims[RED][CIEY] = atof(argv[++i]);
68			myprims[GRN][CIEX] = atof(argv[++i]);
69			myprims[GRN][CIEY] = atof(argv[++i]);
70			myprims[BLU][CIEX] = atof(argv[++i]);
71			myprims[BLU][CIEY] = atof(argv[++i]);
72			myprims[WHT][CIEX] = atof(argv[++i]);
73			myprims[WHT][CIEY] = atof(argv[++i]);
74			if (rgbp == stdprims)
75			rgbp = myprims;
76	greg	2.1	break;
77			case 'r':
78			reverse = !reverse;
79			break;
80			default:
81			goto userr;
82			}
83			else
84			break;
85
86			if (i < argc-2)
87			goto userr;
88
89			SET_FILE_BINARY(stdin);
90			SET_FILE_BINARY(stdout);
91			SET_DEFAULT_BINARY();
92
93			if (i <= argc-1 && strcmp(argv[i], "-"))
94			inpfile = argv[i];
95
96			if (i == argc-2 && strcmp(argv[i+1], "-"))
97			outfile = argv[i+1];
98	greg	2.4	/* check for tone-mapping */
99			if (expec != NULL) {
100			if (reverse)
101			goto userr;
102			tmap2bmp(inpfile, outfile, expec, rgbp, gamcor);
103			return(0);
104			}
105	greg	2.1
106			setcolrgam(gamcor); /* set up conversion */
107
108			if (reverse) {
109			BMPReader *rdr;
110			/* open BMP file or stream */
111			if (inpfile != NULL)
112			rdr = BMPopenInputFile(inpfile);
113			else
114			rdr = BMPopenInputStream(stdin);
115
116			if (rdr == NULL) {
117			fprintf(stderr, "%s: cannot open or recognize BMP\n",
118			inpfile != NULL ? inpfile : "<stdin>");
119			exit(1);
120			}
121			/* open Radiance output */
122			if (outfile != NULL && freopen(outfile, "w", stdout) == NULL) {
123			fprintf(stderr, "%s: cannot open for output\n",
124			outfile);
125			exit(1);
126			}
127			/* put Radiance header */
128			newheader("RADIANCE", stdout);
129			printargs(i, argv, stdout);
130			fputformat(COLRFMT, stdout);
131			putchar('\n');
132			rs.xr = rdr->hdr->width;
133			rs.yr = rdr->hdr->height;
134			rs.rt = YMAJOR;
135	greg	2.2	/* write scans downward if we can */
136	greg	2.1	if (rdr->hdr->yIsDown \|\| inpfile != NULL)
137			rs.rt \|= YDECR;
138			fputsresolu(&rs, stdout);
139			/* convert file */
140			bmp2rad(rdr, stdout, !rdr->hdr->yIsDown && inpfile!=NULL);
141			/* flush output */
142	greg	2.2	BMPcloseInput(rdr);
143	greg	2.1	if (fflush(stdout) < 0)
144			quiterr("error writing Radiance output");
145			} else {
146			BMPHeader *hdr;
147			BMPWriter *wtr;
148			/* open Radiance input */
149			if (inpfile != NULL && freopen(inpfile, "r", stdin) == NULL) {
150			fprintf(stderr, "%s: cannot open input file\n",
151			inpfile);
152			exit(1);
153			}
154			/* get header info. */
155	greg	2.9	if (getheader(stdin, headline, NULL) < 0 \|\|
156	greg	2.1	!fgetsresolu(&rs, stdin))
157			quiterr("bad Radiance picture format");
158			/* initialize BMP header */
159	greg	2.4	if (rgbp == NULL) {
160			hdr = BMPmappedHeader(scanlen(&rs),
161			numscans(&rs), 0, 256);
162	greg	2.10	/*
163	greg	2.2	if (outfile != NULL)
164			hdr->compr = BI_RLE8;
165	greg	2.10	*/
166	greg	2.2	} else
167	greg	2.4	hdr = BMPtruecolorHeader(scanlen(&rs),
168			numscans(&rs), 0);
169	greg	2.1	if (hdr == NULL)
170			quiterr("cannot initialize BMP header");
171	greg	2.2	/* set up output direction */
172	greg	2.7	hdr->yIsDown = ((outfile == NULL) \| (hdr->compr == BI_RLE8));
173	greg	2.1	/* open BMP output */
174			if (outfile != NULL)
175			wtr = BMPopenOutputFile(outfile, hdr);
176			else
177			wtr = BMPopenOutputStream(stdout, hdr);
178	greg	2.2	if (wtr == NULL)
179			quiterr("cannot allocate writer structure");
180	greg	2.1	/* convert file */
181	greg	2.9	rad2bmp(stdin, wtr, !hdr->yIsDown, rgbp);
182	greg	2.1	/* flush output */
183			if (fflush((FILE *)wtr->c_data) < 0)
184			quiterr("error writing BMP output");
185	greg	2.2	BMPcloseOutput(wtr);
186	greg	2.1	}
187	greg	2.4	return(0); /* success */
188	greg	2.1	userr:
189			fprintf(stderr,
190	greg	2.4	"Usage: %s [-b][-g gamma][-e spec][-p xr yr xg yg xb yb xw yw] [input\|- [output]]\n",
191	greg	2.1	progname);
192	greg	2.4	fprintf(stderr,
193			" or: %s -r [-g gamma][-e +/-stops] [input\|- [output]]\n",
194			progname);
195			return(1);
196	greg	2.1	}
197
198			/* print message and exit */
199	schorsch	2.3	static void
200	greg	2.1	quiterr(const char *err)
201			{
202			if (err != NULL) {
203			fprintf(stderr, "%s: %s\n", progname, err);
204			exit(1);
205			}
206			exit(0);
207			}
208
209	greg	2.9	/* process header line (don't echo) */
210			static int
211			headline(char s, void p)
212			{
213	greg	2.12	char fmt[MAXFMTLEN];
214	greg	2.9
215			if (formatval(fmt, s)) { /* check if format string */
216			if (!strcmp(fmt,COLRFMT))
217			return(0);
218			if (!strcmp(fmt,CIEFMT)) {
219			rgbinp = TM_XYZPRIM;
220			return(0);
221			}
222	greg	2.15	if (!strcmp(fmt,SPECFMT))
223			return(0);
224	greg	2.9	return(-1);
225			}
226			if (isprims(s)) { /* get input primaries */
227			primsval(myinprims, s);
228			rgbinp = myinprims;
229			return(0);
230			}
231	greg	2.15	if (isncomp(s)) {
232			NCSAMP = ncompval(s);
233			return(0);
234			}
235			if (iswlsplit(s)) {
236			wlsplitval(WLPART, s);
237			return(0);
238			}
239	greg	2.9	/* should I grok colcorr also? */
240			return(0);
241			}
242
243
244	greg	2.1	/* convert Radiance picture to BMP */
245	schorsch	2.3	static void
246	greg	2.9	rad2bmp(FILE rfp, BMPWriter bwr, int inv, RGBPRIMP monpri)
247	greg	2.1	{
248	greg	2.9	int usexfm = 0;
249			COLORMAT xfm;
250	greg	2.1	COLR *scanin;
251	greg	2.9	COLOR cval;
252	greg	2.1	int y, yend, ystp;
253			int x;
254			/* allocate scanline */
255			scanin = (COLR )malloc(bwr->hdr->widthsizeof(COLR));
256			if (scanin == NULL)
257			quiterr("out of memory in rad2bmp");
258	greg	2.9	/* set up color conversion */
259			usexfm = (monpri != NULL ? rgbinp != monpri :
260			rgbinp != TM_XYZPRIM && rgbinp != stdprims);
261			if (usexfm) {
262	greg	2.14	RGBPRIMP destpri = monpri != NULL ? monpri : stdprims;
263			double expcomp = pow(2.0, (double)bradj);
264	greg	2.9	if (rgbinp == TM_XYZPRIM)
265	greg	2.14	compxyz2rgbWBmat(xfm, destpri);
266	greg	2.9	else
267	greg	2.14	comprgb2rgbWBmat(xfm, rgbinp, destpri);
268	greg	2.9	for (y = 0; y < 3; y++)
269			for (x = 0; x < 3; x++)
270			xfm[y][x] *= expcomp;
271			}
272	greg	2.1	/* convert image */
273			if (inv) {
274			y = bwr->hdr->height - 1;
275			ystp = -1; yend = -1;
276			} else {
277			y = 0;
278			ystp = 1; yend = bwr->hdr->height;
279			}
280			/* convert each scanline */
281			for ( ; y != yend; y += ystp) {
282	greg	2.15	if (fread2colrs(scanin, bwr->hdr->width, rfp, NCSAMP, WLPART) < 0)
283	greg	2.1	quiterr("error reading Radiance picture");
284	greg	2.9	if (usexfm)
285			for (x = bwr->hdr->width; x--; ) {
286			colr_color(cval, scanin[x]);
287			colortrans(cval, xfm, cval);
288			setcolr(scanin[x], colval(cval,RED),
289			colval(cval,GRN),
290			colval(cval,BLU));
291			}
292			else if (bradj)
293	greg	2.1	shiftcolrs(scanin, bwr->hdr->width, bradj);
294	greg	2.9	if (monpri == NULL && rgbinp != TM_XYZPRIM)
295			for (x = bwr->hdr->width; x--; )
296			scanin[x][GRN] = normbright(scanin[x]);
297	greg	2.1	colrs_gambs(scanin, bwr->hdr->width);
298	greg	2.9	if (monpri == NULL)
299	greg	2.1	for (x = bwr->hdr->width; x--; )
300			bwr->scanline[x] = scanin[x][GRN];
301			else
302			for (x = bwr->hdr->width; x--; ) {
303			bwr->scanline[3*x] = scanin[x][BLU];
304			bwr->scanline[3*x+1] = scanin[x][GRN];
305			bwr->scanline[3*x+2] = scanin[x][RED];
306			}
307			bwr->yscan = y;
308			x = BMPwriteScanline(bwr);
309			if (x != BIR_OK)
310			quiterr(BMPerrorMessage(x));
311			}
312			/* free scanline */
313			free((void *)scanin);
314			}
315
316			/* convert BMP file to Radiance */
317	schorsch	2.3	static void
318	greg	2.1	bmp2rad(BMPReader brd, FILE rfp, int inv)
319			{
320			COLR *scanout;
321			int y, yend, ystp;
322			int x;
323			/* allocate scanline */
324			scanout = (COLR )malloc(brd->hdr->widthsizeof(COLR));
325			if (scanout == NULL)
326			quiterr("out of memory in bmp2rad");
327			/* convert image */
328			if (inv) {
329			y = brd->hdr->height - 1;
330			ystp = -1; yend = -1;
331			} else {
332			y = 0;
333			ystp = 1; yend = brd->hdr->height;
334			}
335			/* convert each scanline */
336			for ( ; y != yend; y += ystp) {
337			x = BMPseekScanline(y, brd);
338			if (x != BIR_OK)
339			quiterr(BMPerrorMessage(x));
340			for (x = brd->hdr->width; x--; ) {
341			RGBquad rgbq = BMPdecodePixel(x, brd);
342			scanout[x][RED] = rgbq.r;
343			scanout[x][GRN] = rgbq.g;
344			scanout[x][BLU] = rgbq.b;
345			}
346			gambs_colrs(scanout, brd->hdr->width);
347			if (bradj)
348			shiftcolrs(scanout, brd->hdr->width, bradj);
349			if (fwritecolrs(scanout, brd->hdr->width, rfp) < 0)
350			quiterr("error writing Radiance picture");
351			}
352			/* clean up */
353			free((void *)scanout);
354			}
355	greg	2.4
356			/* Tone-map and convert Radiance picture */
357			static void
358			tmap2bmp(char fnin, char fnout, char *expec, RGBPRIMP monpri, double gamval)
359			{
360			int tmflags;
361			BMPHeader *hdr;
362			BMPWriter *wtr;
363			FILE *fp;
364			int xr, yr;
365	greg	2.11	uby8 *pa;
366	greg	2.4	int i;
367			/* check tone-mapping spec */
368			i = strlen(expec);
369			if (i && !strncmp(expec, "auto", i))
370			tmflags = TM_F_CAMERA;
371			else if (i && !strncmp(expec, "human", i))
372			tmflags = TM_F_HUMAN & ~TM_F_UNIMPL;
373			else if (i && !strncmp(expec, "linear", i))
374			tmflags = TM_F_LINEAR;
375			else
376			quiterr("illegal exposure specification (auto\|human\|linear)");
377			if (monpri == NULL) {
378			tmflags \|= TM_F_BW;
379			monpri = stdprims;
380			}
381			/* open Radiance input */
382			if (fnin == NULL)
383			fp = stdin;
384			else if ((fp = fopen(fnin, "r")) == NULL) {
385			fprintf(stderr, "%s: cannot open\n", fnin);
386			exit(1);
387			}
388			/* tone-map picture */
389			if (tmMapPicture(&pa, &xr, &yr, tmflags, monpri, gamval,
390			0., 0., fnin, fp) != TM_E_OK)
391			exit(1);
392			/* initialize BMP header */
393			if (tmflags & TM_F_BW) {
394			hdr = BMPmappedHeader(xr, yr, 0, 256);
395	greg	2.5	if (fnout != NULL)
396			hdr->compr = BI_RLE8;
397	greg	2.4	} else
398			hdr = BMPtruecolorHeader(xr, yr, 0);
399			if (hdr == NULL)
400			quiterr("cannot initialize BMP header");
401			/* open BMP output */
402			if (fnout != NULL)
403			wtr = BMPopenOutputFile(fnout, hdr);
404			else
405			wtr = BMPopenOutputStream(stdout, hdr);
406			if (wtr == NULL)
407			quiterr("cannot allocate writer structure");
408			/* write to BMP file */
409			while (wtr->yscan < yr) {
410	greg	2.11	uby8 scn = pa + xr((tmflags & TM_F_BW) ? 1 : 3)*
411	greg	2.7	(yr-1 - wtr->yscan);
412	greg	2.4	if (tmflags & TM_F_BW)
413			memcpy((void )wtr->scanline, (void )scn, xr);
414			else
415			for (i = xr; i--; ) {
416			wtr->scanline[3i] = scn[3i+BLU];
417			wtr->scanline[3i+1] = scn[3i+GRN];
418			wtr->scanline[3i+2] = scn[3i+RED];
419			}
420			if ((i = BMPwriteScanline(wtr)) != BIR_OK)
421			quiterr(BMPerrorMessage(i));
422			}
423			/* flush output */
424			if (fflush((FILE *)wtr->c_data) < 0)
425			quiterr("error writing BMP output");
426			/* clean up */
427	greg	2.8	if (fnin != NULL)
428			fclose(fp);
429	greg	2.4	free((void *)pa);
430			BMPcloseOutput(wtr);
431			}