src/util/cmatrix.c

#ifndef lint
static const char RCSid[] = "$Id: cmatrix.c,v 2.32 2021/01/19 23:32:00 greg Exp $";
#endif
/*
 * Color matrix routines.
 *
 *      G. Ward
 */

#include <ctype.h>
#include "platform.h"
#include "standard.h"
#include "cmatrix.h"
#include "platform.h"
#include "paths.h"
#include "resolu.h"

const char      stdin_name[] = "<stdin>";

const char      *cm_fmt_id[] = {
                        "unknown", COLRFMT, CIEFMT,
                        "float", "ascii", "double"
                };

const int       cm_elem_size[] = {
                        0, 4, 4, 3*sizeof(float), 0, 3*sizeof(double)
                };

/* Allocate a color coefficient matrix */
CMATRIX *
cm_alloc(int nrows, int ncols)
{
        CMATRIX *cm;

        if ((nrows <= 0) | (ncols <= 0))
                error(USER, "attempt to create empty matrix");
        cm = (CMATRIX *)malloc(sizeof(CMATRIX) +
                                sizeof(COLOR)*((size_t)nrows*ncols - 1));
        if (!cm)
                error(SYSTEM, "out of memory in cm_alloc()");
        cm->nrows = nrows;
        cm->ncols = ncols;
        return(cm);
}

static void
adjacent_ra_sizes(size_t bounds[2], size_t target)
{
        bounds[0] = 0; bounds[1] = 2048;
        while (bounds[1] < target) {
                bounds[0] = bounds[1];
                bounds[1] += bounds[1]>>1;
        }
}

/* Resize color coefficient matrix */
CMATRIX *
cm_resize(CMATRIX *cm, int nrows)
{
        size_t  old_size, new_size, ra_bounds[2];

        if (!cm)
                return(NULL);
        if (nrows == cm->nrows)
                return(cm);
        if (nrows <= 0) {
                cm_free(cm);
                return(NULL);
        }
        old_size = sizeof(CMATRIX) + sizeof(COLOR)*((size_t)cm->nrows*cm->ncols - 1);
        adjacent_ra_sizes(ra_bounds, old_size);
        new_size = sizeof(CMATRIX) + sizeof(COLOR)*((size_t)nrows*cm->ncols - 1);
        if (nrows < cm->nrows ? new_size <= ra_bounds[0] :
                                new_size > ra_bounds[1]) {
                adjacent_ra_sizes(ra_bounds, new_size);
                cm = (CMATRIX *)realloc(cm, ra_bounds[1]);
                if (!cm)
                        error(SYSTEM, "out of memory in cm_resize()");
        }
        cm->nrows = nrows;
        return(cm);
}

typedef struct {
        int     dtype;          /* data type */
        int     need2swap;      /* need byte swap? */
        int     nrows, ncols;   /* matrix size */
        COLOR   expos;          /* exposure value */
        char    *err;           /* error message */
} CMINFO;               /* header info record */

static int
get_cminfo(char *s, void *p)
{
        CMINFO  *ip = (CMINFO *)p;
        char    fmt[MAXFMTLEN];
        int     i;

        if (!strncmp(s, "NCOMP=", 6) && atoi(s+6) != 3) {
                ip->err = "unexpected # components (must be 3)";
                return(-1);
        }
        if (!strncmp(s, "NROWS=", 6)) {
                ip->nrows = atoi(s+6);
                return(0);
        }
        if (!strncmp(s, "NCOLS=", 6)) {
                ip->ncols = atoi(s+6);
                return(0);
        }
        if ((i = isbigendian(s)) >= 0) {
                ip->need2swap = (nativebigendian() != i);
                return(0);
        }
        if (isexpos(s)) {
                double  d = exposval(s);
                scalecolor(ip->expos, d);
                return(0);
        }
        if (iscolcor(s)) {
                COLOR   ctmp;
                colcorval(ctmp, s);
                multcolor(ip->expos, ctmp);
                return(0);
        }
        if (!formatval(fmt, s))
                return(0);
        for (i = 1; i < DTend; i++)
                if (!strcmp(fmt, cm_fmt_id[i]))
                        ip->dtype = i;
        return(0);
}

/* Load header to obtain/check data type and number of columns */
char *
cm_getheader(int *dt, int *nr, int *nc, int *swp, COLOR scale, FILE *fp)
{
        CMINFO  cmi;
                                                /* read header */
        cmi.dtype = DTfromHeader;
        cmi.need2swap = 0;
        cmi.expos[0] = cmi.expos[1] = cmi.expos[2] = 1.f;
        cmi.nrows = cmi.ncols = 0;
        cmi.err = "unexpected EOF in header";
        if (getheader(fp, get_cminfo, &cmi) < 0)
                return(cmi.err);
        if (dt) {                               /* get/check data type? */
                if (cmi.dtype == DTfromHeader) {
                        if (*dt == DTfromHeader)
                                return("missing/unknown data format in header");
                } else if (*dt == DTfromHeader)
                        *dt = cmi.dtype;
                else if (*dt != cmi.dtype)
                        return("unexpected data format in header");
        }
        if (nr) {                               /* get/check #rows? */
                if (*nr <= 0)
                        *nr = cmi.nrows;
                else if ((cmi.nrows > 0) & (*nr != cmi.nrows))
                        return("unexpected row count in header");
        }
        if (nc) {                               /* get/check #columns? */
                if (*nc <= 0)
                        *nc = cmi.ncols;
                else if ((cmi.ncols > 0) & (*nc != cmi.ncols))
                        return("unexpected column count in header");
        }
        if (swp)                                /* get/check swap? */
                *swp = cmi.need2swap;
        if (scale) {                            /* transfer exposure comp. */
                scale[0] = 1.f/cmi.expos[0];
                scale[1] = 1.f/cmi.expos[1];
                scale[2] = 1.f/cmi.expos[2];
        }
        return(NULL);
}

/* Allocate and load image data into matrix */
static CMATRIX *
cm_load_rgbe(FILE *fp, int nrows, int ncols, COLOR scale)
{
        int     doscale;
        CMATRIX *cm;
        COLORV  *mp;
                                                /* header already loaded */
        cm = cm_alloc(nrows, ncols);
        if (!cm)
                return(NULL);
        doscale = (scale[0] < .99) | (scale[0] > 1.01) |
                        (scale[1] < .99) | (scale[1] > 1.01) |
                        (scale[2] < .99) | (scale[2] > 1.01) ;
        mp = cm->cmem;
        while (nrows--) {
                if (freadscan((COLOR *)mp, ncols, fp) < 0) {
                        error(USER, "error reading color picture as matrix");
                        cm_free(cm);
                        return(NULL);
                }
                if (doscale) {
                        int     i = ncols;
                        while (i--) {
                                *mp++ *= scale[0];
                                *mp++ *= scale[1];
                                *mp++ *= scale[2];
                        }
                } else
                        mp += 3*ncols;
        }                                       /* caller closes stream */
        return(cm);
}

/* Allocate and load a matrix from the given input (or stdin if NULL) */
CMATRIX *
cm_load(const char *inspec, int nrows, int ncols, int dtype)
{
        const int       ROWINC = 2048;
        int             swap = 0;
        FILE            *fp;
        COLOR           scale;
        CMATRIX         *cm;

        if (!inspec)
                inspec = stdin_name;
        else if (!*inspec)
                return(NULL);
        if (inspec == stdin_name) {             /* reading from stdin? */
                fp = stdin;
        } else if (inspec[0] == '!') {
                fp = popen(inspec+1, "r");
                if (!fp) {
                        sprintf(errmsg, "cannot start command '%s'", inspec);
                        error(SYSTEM, errmsg);
                }
        } else if (!(fp = fopen(inspec, "r"))) {
                sprintf(errmsg, "cannot open file '%s'", inspec);
                error(SYSTEM, errmsg);
        }
#ifdef getc_unlocked
        flockfile(fp);
#endif
        if (dtype != DTascii)
                SET_FILE_BINARY(fp);            /* doesn't really work */
        if (!dtype | !ncols) {                  /* expecting header? */
                char    *err = cm_getheader(&dtype, &nrows, &ncols, &swap, scale, fp);
                if (err)
                        error(USER, err);
        }
        if (ncols <= 0 && !fscnresolu(&ncols, &nrows, fp))
                error(USER, "unspecified number of columns");
        switch (dtype) {
        case DTascii:
        case DTfloat:
        case DTdouble:
                break;
        case DTrgbe:
        case DTxyze:
                cm = cm_load_rgbe(fp, nrows, ncols, scale);
                goto cleanup;
        default:
                error(USER, "unexpected data type in cm_load()");
        }
        if (nrows <= 0) {                       /* don't know length? */
                int     guessrows = 147;        /* usually big enough */
                if (cm_elem_size[dtype] && (fp != stdin) & (inspec[0] != '!')) {
                        long    startpos = ftell(fp);
                        if (fseek(fp, 0L, SEEK_END) == 0) {
                                long    rowsiz = (long)ncols*cm_elem_size[dtype];
                                long    endpos = ftell(fp);

                                if ((endpos - startpos) % rowsiz) {
                                        sprintf(errmsg,
                                        "improper length for binary file '%s'",
                                                        inspec);
                                        error(USER, errmsg);
                                }
                                guessrows = (endpos - startpos)/rowsiz;
                                if (fseek(fp, startpos, SEEK_SET) < 0) {
                                        sprintf(errmsg,
                                                "fseek() error on file '%s'",
                                                        inspec);
                                        error(SYSTEM, errmsg);
                                }
                                nrows = guessrows;      /* we're confident */
                        }
                }
                cm = cm_alloc(guessrows, ncols);
        } else
                cm = cm_alloc(nrows, ncols);
        if (!cm)                                        /* XXX never happens */
                return(NULL);
        if (dtype == DTascii) {                         /* read text file */
                int     maxrow = (nrows > 0 ? nrows : 32000);
                int     r, c;
                for (r = 0; r < maxrow; r++) {
                    if (r >= cm->nrows)                 /* need more space? */
                        cm = cm_resize(cm, cm->nrows+ROWINC);
                    for (c = 0; c < ncols; c++) {
                        COLORV  *cv = cm_lval(cm,r,c);
                        if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3) {
                                if ((nrows <= 0) & (r > 0) & !c) {
                                        cm = cm_resize(cm, maxrow=r);
                                        break;
                                } else
                                        goto EOFerror;
                        }
                    }
                }
                while ((c = getc(fp)) != EOF)
                        if (!isspace(c)) {
                                sprintf(errmsg,
                                "unexpected data at end of ascii input '%s'",
                                                inspec);
                                error(WARNING, errmsg);
                                break;
                        }
        } else {                                        /* read binary file */
                if (sizeof(COLOR) == cm_elem_size[dtype]) {
                        size_t  nread = 0;
                        do {                            /* read all we can */
                                nread += getbinary(cm->cmem + 3*nread,
                                                sizeof(COLOR),
                                                (size_t)cm->nrows*cm->ncols - nread,
                                                fp);
                                if (nrows <= 0) {       /* unknown length */
                                        if (nread == (size_t)cm->nrows*cm->ncols)
                                                        /* need more space? */
                                                cm = cm_resize(cm, cm->nrows+ROWINC);
                                        else if (nread && !(nread % cm->ncols))
                                                        /* seem to be  done */
                                                cm = cm_resize(cm, nread/cm->ncols);
                                        else            /* ended mid-row */
                                                goto EOFerror;
                                } else if (nread < (size_t)cm->nrows*cm->ncols)
                                        goto EOFerror;
                        } while (nread < (size_t)cm->nrows*cm->ncols);

                        if (swap) {
                                if (sizeof(COLORV) == 4)
                                        swap32((char *)cm->cmem,
                                                        3*(size_t)cm->nrows*cm->ncols);
                                else /* sizeof(COLORV) == 8 */
                                        swap64((char *)cm->cmem,
                                                        3*(size_t)cm->nrows*cm->ncols);
                        }
                } else if (dtype == DTdouble) {
                        double  dc[3];                  /* load from double */
                        COLORV  *cvp = cm->cmem;
                        size_t  n = (size_t)nrows*ncols;

                        if (n <= 0)
                                goto not_handled;
                        while (n--) {
                                if (getbinary(dc, sizeof(double), 3, fp) != 3)
                                        goto EOFerror;
                                if (swap) swap64((char *)dc, 3);
                                copycolor(cvp, dc);
                                cvp += 3;
                        }
                } else /* dtype == DTfloat */ {
                        float   fc[3];                  /* load from float */
                        COLORV  *cvp = cm->cmem;
                        size_t  n = (size_t)nrows*ncols;

                        if (n <= 0)
                                goto not_handled;
                        while (n--) {
                                if (getbinary(fc, sizeof(float), 3, fp) != 3)
                                        goto EOFerror;
                                if (swap) swap32((char *)fc, 3);
                                copycolor(cvp, fc);
                                cvp += 3;
                        }
                }
                if (fgetc(fp) != EOF) {
                                sprintf(errmsg,
                                "unexpected data at end of binary input '%s'",
                                                inspec);
                                error(WARNING, errmsg);
                }
        }
cleanup:
        if (fp != stdin) {
                if (inspec[0] != '!')
                        fclose(fp);
                else if (pclose(fp)) {
                        sprintf(errmsg, "error running command '%s'", inspec);
                        error(WARNING, errmsg);
                }
        }
#ifdef getc_unlocked
        else
                funlockfile(fp);
#endif
        return(cm);
EOFerror:
        sprintf(errmsg, "unexpected EOF reading %s", inspec);
        error(USER, errmsg);
        return(NULL);
not_handled:
        error(INTERNAL, "unhandled data size or length in cm_load()");
        return(NULL);   /* gratis return */
}

/* Extract a column vector from a matrix */
CMATRIX *
cm_column(const CMATRIX *cm, int c)
{
        CMATRIX *cvr;
        int     dr;

        if (!cm)
                return(NULL);
        if ((c < 0) | (c >= cm->ncols))
                error(INTERNAL, "column requested outside matrix");
        cvr = cm_alloc(cm->nrows, 1);
        if (!cvr)
                return(NULL);
        for (dr = 0; dr < cm->nrows; dr++) {
                const COLORV    *sp = cm_lval(cm,dr,c);
                COLORV          *dp = cv_lval(cvr,dr);
                dp[0] = sp[0];
                dp[1] = sp[1];
                dp[2] = sp[2];
        }
        return(cvr);
}

/* Multiply two matrices (or a matrix and a vector) and allocate the result */
CMATRIX *
cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2)
{
        char    *rowcheck=NULL, *colcheck=NULL;
        CMATRIX *cmr;
        int     dr, dc, i;

        if (!cm1 | !cm2)
                return(NULL);
        if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows))
                error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
        cmr = cm_alloc(cm1->nrows, cm2->ncols);
        if (!cmr)
                return(NULL);
                                /* optimization: check for zero rows & cols */
        if (((cm1->nrows > 5) | (cm2->ncols > 5)) & (cm1->ncols > 5)) {
                static const COLOR      czero;
                rowcheck = (char *)calloc(cmr->nrows, 1);
                for (dr = cm1->nrows*(rowcheck != NULL); dr--; )
                    for (dc = cm1->ncols; dc--; )
                        if (memcmp(cm_lval(cm1,dr,dc), czero, sizeof(COLOR))) {
                                rowcheck[dr] = 1;
                                break;
                        }
                colcheck = (char *)calloc(cmr->ncols, 1);
                for (dc = cm2->ncols*(colcheck != NULL); dc--; )
                    for (dr = cm2->nrows; dr--; )
                        if (memcmp(cm_lval(cm2,dr,dc), czero, sizeof(COLOR))) {
                                colcheck[dc] = 1;
                                break;
                        }
        }
        for (dr = 0; dr < cmr->nrows; dr++)
            for (dc = 0; dc < cmr->ncols; dc++) {
                COLORV  *dp = cm_lval(cmr,dr,dc);
                double  res[3];
                dp[0] = dp[1] = dp[2] = 0;
                if (rowcheck && !rowcheck[dr])
                        continue;
                if (colcheck && !colcheck[dc])
                        continue;
                res[0] = res[1] = res[2] = 0;
                for (i = 0; i < cm1->ncols; i++) {
                    const COLORV        *cp1 = cm_lval(cm1,dr,i);
                    const COLORV        *cp2 = cm_lval(cm2,i,dc);
                    res[0] += (double)cp1[0] * cp2[0];
                    res[1] += (double)cp1[1] * cp2[1];
                    res[2] += (double)cp1[2] * cp2[2];
                }
                copycolor(dp, res);
            }
        if (rowcheck) free(rowcheck);
        if (colcheck) free(colcheck);
        return(cmr);
}

/* write out matrix to file (precede by resolution string if picture) */
int
cm_write(const CMATRIX *cm, int dtype, FILE *fp)
{
        static const char       tabEOL[2] = {'\t','\n'};
        const COLORV            *mp;
        int                     r, c;
        size_t                  n, rv;

        if (!cm)
                return(0);
        mp = cm->cmem;
        switch (dtype) {
        case DTascii:
                for (r = 0; r < cm->nrows; r++)
                        for (c = 0; c < cm->ncols; c++, mp += 3)
                                fprintf(fp, "%.6e %.6e %.6e%c",
                                                mp[0], mp[1], mp[2],
                                                tabEOL[c >= cm->ncols-1]);
                break;
        case DTfloat:
        case DTdouble:
                if (sizeof(COLOR) == cm_elem_size[dtype]) {
                        n = (size_t)cm->ncols*cm->nrows;
                        while (n > 0) {
                                rv = fwrite(mp, sizeof(COLOR), n, fp);
                                if (rv <= 0)
                                        return(0);
                                mp += 3*rv;
                                n -= rv;
                        }
                } else if (dtype == DTdouble) {
                        double  dc[3];
                        n = (size_t)cm->ncols*cm->nrows;
                        while (n--) {
                                copycolor(dc, mp);
                                if (putbinary(dc, sizeof(double), 3, fp) != 3)
                                        return(0);
                                mp += 3;
                        }
                } else /* dtype == DTfloat */ {
                        float   fc[3];
                        n = (size_t)cm->ncols*cm->nrows;
                        while (n--) {
                                copycolor(fc, mp);
                                if (putbinary(fc, sizeof(float), 3, fp) != 3)
                                        return(0);
                                mp += 3;
                        }
                }
                break;
        case DTrgbe:
        case DTxyze:
                fprtresolu(cm->ncols, cm->nrows, fp);
                for (r = 0; r < cm->nrows; r++, mp += 3*cm->ncols)
                        if (fwritescan((COLOR *)mp, cm->ncols, fp) < 0)
                                return(0);
                break;
        default:
                fputs("Unsupported data type in cm_write()!\n", stderr);
                return(0);
        }
        return(fflush(fp) == 0);
}
Revision:	2.33
Committed:	Fri Jan 22 16:19:15 2021 UTC (3 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.32:	+6 -4 lines
Log Message:	fix: reinstated interpretation of NULL file name as stdin, so dctimestep works
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.33	static const char RCSid[] = "$Id: cmatrix.c,v 2.32 2021/01/19 23:32:00 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* Color matrix routines.
6			*
7			* G. Ward
8			*/
9
10			#include <ctype.h>
11	schorsch	2.16	#include "platform.h"
12	greg	2.1	#include "standard.h"
13			#include "cmatrix.h"
14			#include "platform.h"
15	greg	2.14	#include "paths.h"
16	greg	2.2	#include "resolu.h"
17
18	greg	2.32	const char stdin_name[] = "<stdin>";
19
20	greg	2.2	const char *cm_fmt_id[] = {
21	greg	2.24	"unknown", COLRFMT, CIEFMT,
22			"float", "ascii", "double"
23	greg	2.2	};
24
25			const int cm_elem_size[] = {
26	greg	2.26	0, 4, 4, 3sizeof(float), 0, 3sizeof(double)
27	greg	2.2	};
28	greg	2.1
29			/* Allocate a color coefficient matrix */
30			CMATRIX *
31			cm_alloc(int nrows, int ncols)
32			{
33			CMATRIX *cm;
34
35			if ((nrows <= 0) \| (ncols <= 0))
36			error(USER, "attempt to create empty matrix");
37			cm = (CMATRIX *)malloc(sizeof(CMATRIX) +
38	greg	2.29	sizeof(COLOR)((size_t)nrowsncols - 1));
39	greg	2.21	if (!cm)
40	greg	2.1	error(SYSTEM, "out of memory in cm_alloc()");
41			cm->nrows = nrows;
42			cm->ncols = ncols;
43			return(cm);
44			}
45
46	greg	2.6	static void
47			adjacent_ra_sizes(size_t bounds[2], size_t target)
48			{
49			bounds[0] = 0; bounds[1] = 2048;
50			while (bounds[1] < target) {
51			bounds[0] = bounds[1];
52			bounds[1] += bounds[1]>>1;
53			}
54			}
55
56	greg	2.1	/* Resize color coefficient matrix */
57			CMATRIX *
58			cm_resize(CMATRIX *cm, int nrows)
59			{
60	greg	2.6	size_t old_size, new_size, ra_bounds[2];
61
62	greg	2.21	if (!cm)
63			return(NULL);
64	greg	2.1	if (nrows == cm->nrows)
65			return(cm);
66			if (nrows <= 0) {
67			cm_free(cm);
68			return(NULL);
69			}
70	greg	2.30	old_size = sizeof(CMATRIX) + sizeof(COLOR)((size_t)cm->nrowscm->ncols - 1);
71	greg	2.6	adjacent_ra_sizes(ra_bounds, old_size);
72	greg	2.30	new_size = sizeof(CMATRIX) + sizeof(COLOR)((size_t)nrowscm->ncols - 1);
73	greg	2.6	if (nrows < cm->nrows ? new_size <= ra_bounds[0] :
74			new_size > ra_bounds[1]) {
75			adjacent_ra_sizes(ra_bounds, new_size);
76			cm = (CMATRIX *)realloc(cm, ra_bounds[1]);
77	greg	2.21	if (!cm)
78	greg	2.6	error(SYSTEM, "out of memory in cm_resize()");
79			}
80	greg	2.1	cm->nrows = nrows;
81			return(cm);
82			}
83
84	greg	2.5	typedef struct {
85			int dtype; /* data type */
86	greg	2.22	int need2swap; /* need byte swap? */
87	greg	2.5	int nrows, ncols; /* matrix size */
88	greg	2.25	COLOR expos; /* exposure value */
89	greg	2.5	char err; / error message */
90			} CMINFO; /* header info record */
91
92	greg	2.1	static int
93	greg	2.5	get_cminfo(char s, void p)
94	greg	2.1	{
95	greg	2.5	CMINFO ip = (CMINFO )p;
96	greg	2.20	char fmt[MAXFMTLEN];
97	greg	2.2	int i;
98	greg	2.5
99			if (!strncmp(s, "NCOMP=", 6) && atoi(s+6) != 3) {
100			ip->err = "unexpected # components (must be 3)";
101			return(-1);
102			}
103			if (!strncmp(s, "NROWS=", 6)) {
104			ip->nrows = atoi(s+6);
105			return(0);
106			}
107			if (!strncmp(s, "NCOLS=", 6)) {
108			ip->ncols = atoi(s+6);
109			return(0);
110			}
111	greg	2.22	if ((i = isbigendian(s)) >= 0) {
112			ip->need2swap = (nativebigendian() != i);
113			return(0);
114			}
115	greg	2.25	if (isexpos(s)) {
116			double d = exposval(s);
117			scalecolor(ip->expos, d);
118			return(0);
119			}
120			if (iscolcor(s)) {
121			COLOR ctmp;
122			colcorval(ctmp, s);
123			multcolor(ip->expos, ctmp);
124			return(0);
125			}
126	greg	2.2	if (!formatval(fmt, s))
127			return(0);
128			for (i = 1; i < DTend; i++)
129			if (!strcmp(fmt, cm_fmt_id[i]))
130	greg	2.5	ip->dtype = i;
131	greg	2.1	return(0);
132			}
133
134	greg	2.5	/* Load header to obtain/check data type and number of columns */
135			char *
136	greg	2.25	cm_getheader(int dt, int nr, int nc, int swp, COLOR scale, FILE *fp)
137	greg	2.1	{
138	greg	2.5	CMINFO cmi;
139			/* read header */
140			cmi.dtype = DTfromHeader;
141	greg	2.22	cmi.need2swap = 0;
142	greg	2.25	cmi.expos[0] = cmi.expos[1] = cmi.expos[2] = 1.f;
143	greg	2.5	cmi.nrows = cmi.ncols = 0;
144			cmi.err = "unexpected EOF in header";
145	greg	2.7	if (getheader(fp, get_cminfo, &cmi) < 0)
146	greg	2.5	return(cmi.err);
147	greg	2.21	if (dt) { /* get/check data type? */
148	greg	2.5	if (cmi.dtype == DTfromHeader) {
149			if (*dt == DTfromHeader)
150			return("missing/unknown data format in header");
151			} else if (*dt == DTfromHeader)
152			*dt = cmi.dtype;
153			else if (*dt != cmi.dtype)
154			return("unexpected data format in header");
155			}
156	greg	2.21	if (nr) { /* get/check #rows? */
157	greg	2.5	if (*nr <= 0)
158			*nr = cmi.nrows;
159			else if ((cmi.nrows > 0) & (*nr != cmi.nrows))
160			return("unexpected row count in header");
161			}
162	greg	2.21	if (nc) { /* get/check #columns? */
163	greg	2.5	if (*nc <= 0)
164			*nc = cmi.ncols;
165			else if ((cmi.ncols > 0) & (*nc != cmi.ncols))
166			return("unexpected column count in header");
167			}
168	greg	2.22	if (swp) /* get/check swap? */
169			*swp = cmi.need2swap;
170	greg	2.25	if (scale) { /* transfer exposure comp. */
171			scale[0] = 1.f/cmi.expos[0];
172			scale[1] = 1.f/cmi.expos[1];
173			scale[2] = 1.f/cmi.expos[2];
174			}
175	greg	2.5	return(NULL);
176	greg	2.1	}
177
178	greg	2.23	/* Allocate and load image data into matrix */
179			static CMATRIX *
180	greg	2.25	cm_load_rgbe(FILE *fp, int nrows, int ncols, COLOR scale)
181	greg	2.23	{
182	greg	2.25	int doscale;
183	greg	2.23	CMATRIX *cm;
184			COLORV *mp;
185			/* header already loaded */
186			cm = cm_alloc(nrows, ncols);
187			if (!cm)
188			return(NULL);
189	greg	2.25	doscale = (scale[0] < .99) \| (scale[0] > 1.01) \|
190			(scale[1] < .99) \| (scale[1] > 1.01) \|
191			(scale[2] < .99) \| (scale[2] > 1.01) ;
192	greg	2.23	mp = cm->cmem;
193			while (nrows--) {
194			if (freadscan((COLOR *)mp, ncols, fp) < 0) {
195			error(USER, "error reading color picture as matrix");
196			cm_free(cm);
197			return(NULL);
198			}
199	greg	2.25	if (doscale) {
200			int i = ncols;
201			while (i--) {
202			mp++ = scale[0];
203			mp++ = scale[1];
204			mp++ = scale[2];
205			}
206			} else
207			mp += 3*ncols;
208	greg	2.23	} /* caller closes stream */
209			return(cm);
210			}
211
212	greg	2.9	/* Allocate and load a matrix from the given input (or stdin if NULL) */
213	greg	2.1	CMATRIX *
214	greg	2.9	cm_load(const char *inspec, int nrows, int ncols, int dtype)
215	greg	2.1	{
216	greg	2.15	const int ROWINC = 2048;
217	greg	2.22	int swap = 0;
218	greg	2.32	FILE *fp;
219	greg	2.25	COLOR scale;
220	greg	2.15	CMATRIX *cm;
221	greg	2.1
222	greg	2.33	if (!inspec)
223			inspec = stdin_name;
224			else if (!*inspec)
225	greg	2.32	return(NULL);
226	greg	2.33	if (inspec == stdin_name) { /* reading from stdin? */
227	greg	2.32	fp = stdin;
228	greg	2.33	} else if (inspec[0] == '!') {
229	greg	2.9	fp = popen(inspec+1, "r");
230	greg	2.21	if (!fp) {
231	greg	2.9	sprintf(errmsg, "cannot start command '%s'", inspec);
232			error(SYSTEM, errmsg);
233			}
234	greg	2.21	} else if (!(fp = fopen(inspec, "r"))) {
235	greg	2.9	sprintf(errmsg, "cannot open file '%s'", inspec);
236	greg	2.1	error(SYSTEM, errmsg);
237			}
238			#ifdef getc_unlocked
239			flockfile(fp);
240			#endif
241			if (dtype != DTascii)
242			SET_FILE_BINARY(fp); /* doesn't really work */
243	greg	2.5	if (!dtype \| !ncols) { /* expecting header? */
244	greg	2.25	char *err = cm_getheader(&dtype, &nrows, &ncols, &swap, scale, fp);
245	greg	2.21	if (err)
246	greg	2.5	error(USER, err);
247			}
248	greg	2.28	if (ncols <= 0 && !fscnresolu(&ncols, &nrows, fp))
249			error(USER, "unspecified number of columns");
250	greg	2.1	switch (dtype) {
251			case DTascii:
252			case DTfloat:
253			case DTdouble:
254			break;
255	greg	2.23	case DTrgbe:
256			case DTxyze:
257	greg	2.25	cm = cm_load_rgbe(fp, nrows, ncols, scale);
258	greg	2.23	goto cleanup;
259	greg	2.1	default:
260			error(USER, "unexpected data type in cm_load()");
261			}
262			if (nrows <= 0) { /* don't know length? */
263			int guessrows = 147; /* usually big enough */
264	greg	2.27	if (cm_elem_size[dtype] && (fp != stdin) & (inspec[0] != '!')) {
265	greg	2.1	long startpos = ftell(fp);
266			if (fseek(fp, 0L, SEEK_END) == 0) {
267	greg	2.27	long rowsiz = (long)ncols*cm_elem_size[dtype];
268	greg	2.1	long endpos = ftell(fp);
269
270	greg	2.27	if ((endpos - startpos) % rowsiz) {
271	greg	2.1	sprintf(errmsg,
272			"improper length for binary file '%s'",
273	greg	2.9	inspec);
274	greg	2.1	error(USER, errmsg);
275			}
276	greg	2.27	guessrows = (endpos - startpos)/rowsiz;
277	greg	2.1	if (fseek(fp, startpos, SEEK_SET) < 0) {
278			sprintf(errmsg,
279			"fseek() error on file '%s'",
280	greg	2.9	inspec);
281	greg	2.1	error(SYSTEM, errmsg);
282			}
283			nrows = guessrows; /* we're confident */
284			}
285			}
286			cm = cm_alloc(guessrows, ncols);
287			} else
288			cm = cm_alloc(nrows, ncols);
289	greg	2.21	if (!cm) /* XXX never happens */
290	greg	2.1	return(NULL);
291			if (dtype == DTascii) { /* read text file */
292			int maxrow = (nrows > 0 ? nrows : 32000);
293			int r, c;
294			for (r = 0; r < maxrow; r++) {
295			if (r >= cm->nrows) /* need more space? */
296	greg	2.15	cm = cm_resize(cm, cm->nrows+ROWINC);
297	greg	2.1	for (c = 0; c < ncols; c++) {
298			COLORV *cv = cm_lval(cm,r,c);
299	greg	2.13	if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3) {
300	greg	2.1	if ((nrows <= 0) & (r > 0) & !c) {
301			cm = cm_resize(cm, maxrow=r);
302			break;
303			} else
304			goto EOFerror;
305	greg	2.13	}
306	greg	2.1	}
307			}
308			while ((c = getc(fp)) != EOF)
309			if (!isspace(c)) {
310			sprintf(errmsg,
311	greg	2.9	"unexpected data at end of ascii input '%s'",
312			inspec);
313	greg	2.1	error(WARNING, errmsg);
314			break;
315			}
316			} else { /* read binary file */
317	greg	2.2	if (sizeof(COLOR) == cm_elem_size[dtype]) {
318	greg	2.31	size_t nread = 0;
319	greg	2.1	do { /* read all we can */
320	greg	2.17	nread += getbinary(cm->cmem + 3*nread,
321	greg	2.4	sizeof(COLOR),
322	greg	2.31	(size_t)cm->nrows*cm->ncols - nread,
323	greg	2.1	fp);
324			if (nrows <= 0) { /* unknown length */
325	greg	2.31	if (nread == (size_t)cm->nrows*cm->ncols)
326	greg	2.1	/* need more space? */
327	greg	2.15	cm = cm_resize(cm, cm->nrows+ROWINC);
328	greg	2.1	else if (nread && !(nread % cm->ncols))
329			/* seem to be done */
330			cm = cm_resize(cm, nread/cm->ncols);
331			else /* ended mid-row */
332			goto EOFerror;
333	greg	2.31	} else if (nread < (size_t)cm->nrows*cm->ncols)
334	greg	2.1	goto EOFerror;
335	greg	2.31	} while (nread < (size_t)cm->nrows*cm->ncols);
336	greg	2.1
337	greg	2.26	if (swap) {
338			if (sizeof(COLORV) == 4)
339			swap32((char *)cm->cmem,
340	greg	2.31	3(size_t)cm->nrowscm->ncols);
341	greg	2.26	else /* sizeof(COLORV) == 8 */
342			swap64((char *)cm->cmem,
343	greg	2.31	3(size_t)cm->nrowscm->ncols);
344	greg	2.26	}
345	greg	2.1	} else if (dtype == DTdouble) {
346			double dc[3]; /* load from double */
347			COLORV *cvp = cm->cmem;
348	greg	2.31	size_t n = (size_t)nrows*ncols;
349	greg	2.1
350			if (n <= 0)
351			goto not_handled;
352			while (n--) {
353	greg	2.17	if (getbinary(dc, sizeof(double), 3, fp) != 3)
354	greg	2.1	goto EOFerror;
355	greg	2.26	if (swap) swap64((char *)dc, 3);
356	greg	2.1	copycolor(cvp, dc);
357			cvp += 3;
358			}
359			} else /* dtype == DTfloat */ {
360			float fc[3]; /* load from float */
361			COLORV *cvp = cm->cmem;
362	greg	2.31	size_t n = (size_t)nrows*ncols;
363	greg	2.1
364			if (n <= 0)
365			goto not_handled;
366			while (n--) {
367	greg	2.17	if (getbinary(fc, sizeof(float), 3, fp) != 3)
368	greg	2.1	goto EOFerror;
369	greg	2.26	if (swap) swap32((char *)fc, 3);
370	greg	2.1	copycolor(cvp, fc);
371			cvp += 3;
372			}
373			}
374			if (fgetc(fp) != EOF) {
375			sprintf(errmsg,
376	greg	2.9	"unexpected data at end of binary input '%s'",
377			inspec);
378	greg	2.1	error(WARNING, errmsg);
379			}
380			}
381	greg	2.23	cleanup:
382	greg	2.9	if (fp != stdin) {
383			if (inspec[0] != '!')
384			fclose(fp);
385			else if (pclose(fp)) {
386			sprintf(errmsg, "error running command '%s'", inspec);
387			error(WARNING, errmsg);
388			}
389			}
390	greg	2.1	#ifdef getc_unlocked
391			else
392			funlockfile(fp);
393			#endif
394			return(cm);
395			EOFerror:
396	greg	2.9	sprintf(errmsg, "unexpected EOF reading %s", inspec);
397	greg	2.1	error(USER, errmsg);
398	greg	2.23	return(NULL);
399	greg	2.1	not_handled:
400			error(INTERNAL, "unhandled data size or length in cm_load()");
401			return(NULL); /* gratis return */
402			}
403
404			/* Extract a column vector from a matrix */
405			CMATRIX *
406			cm_column(const CMATRIX *cm, int c)
407			{
408			CMATRIX *cvr;
409			int dr;
410
411	greg	2.21	if (!cm)
412			return(NULL);
413	greg	2.1	if ((c < 0) \| (c >= cm->ncols))
414			error(INTERNAL, "column requested outside matrix");
415			cvr = cm_alloc(cm->nrows, 1);
416	greg	2.21	if (!cvr)
417	greg	2.1	return(NULL);
418			for (dr = 0; dr < cm->nrows; dr++) {
419			const COLORV *sp = cm_lval(cm,dr,c);
420			COLORV *dp = cv_lval(cvr,dr);
421			dp[0] = sp[0];
422			dp[1] = sp[1];
423			dp[2] = sp[2];
424			}
425			return(cvr);
426			}
427
428			/* Multiply two matrices (or a matrix and a vector) and allocate the result */
429			CMATRIX *
430			cm_multiply(const CMATRIX cm1, const CMATRIX cm2)
431			{
432			char rowcheck=NULL, colcheck=NULL;
433			CMATRIX *cmr;
434			int dr, dc, i;
435
436	greg	2.21	if (!cm1 \| !cm2)
437			return(NULL);
438	greg	2.1	if ((cm1->ncols <= 0) \| (cm1->ncols != cm2->nrows))
439			error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
440			cmr = cm_alloc(cm1->nrows, cm2->ncols);
441	greg	2.21	if (!cmr)
442	greg	2.1	return(NULL);
443			/* optimization: check for zero rows & cols */
444			if (((cm1->nrows > 5) \| (cm2->ncols > 5)) & (cm1->ncols > 5)) {
445			static const COLOR czero;
446			rowcheck = (char *)calloc(cmr->nrows, 1);
447			for (dr = cm1->nrows*(rowcheck != NULL); dr--; )
448			for (dc = cm1->ncols; dc--; )
449			if (memcmp(cm_lval(cm1,dr,dc), czero, sizeof(COLOR))) {
450			rowcheck[dr] = 1;
451			break;
452			}
453			colcheck = (char *)calloc(cmr->ncols, 1);
454			for (dc = cm2->ncols*(colcheck != NULL); dc--; )
455			for (dr = cm2->nrows; dr--; )
456			if (memcmp(cm_lval(cm2,dr,dc), czero, sizeof(COLOR))) {
457			colcheck[dc] = 1;
458			break;
459			}
460			}
461			for (dr = 0; dr < cmr->nrows; dr++)
462			for (dc = 0; dc < cmr->ncols; dc++) {
463			COLORV *dp = cm_lval(cmr,dr,dc);
464	greg	2.4	double res[3];
465	greg	2.1	dp[0] = dp[1] = dp[2] = 0;
466	greg	2.21	if (rowcheck && !rowcheck[dr])
467	greg	2.1	continue;
468	greg	2.21	if (colcheck && !colcheck[dc])
469	greg	2.1	continue;
470	greg	2.4	res[0] = res[1] = res[2] = 0;
471	greg	2.1	for (i = 0; i < cm1->ncols; i++) {
472			const COLORV *cp1 = cm_lval(cm1,dr,i);
473			const COLORV *cp2 = cm_lval(cm2,i,dc);
474	greg	2.18	res[0] += (double)cp1[0] * cp2[0];
475			res[1] += (double)cp1[1] * cp2[1];
476			res[2] += (double)cp1[2] * cp2[2];
477	greg	2.1	}
478	greg	2.4	copycolor(dp, res);
479	greg	2.1	}
480	greg	2.21	if (rowcheck) free(rowcheck);
481			if (colcheck) free(colcheck);
482	greg	2.1	return(cmr);
483			}
484
485	greg	2.2	/* write out matrix to file (precede by resolution string if picture) */
486			int
487			cm_write(const CMATRIX cm, int dtype, FILE fp)
488	greg	2.1	{
489	greg	2.3	static const char tabEOL[2] = {'\t','\n'};
490	greg	2.21	const COLORV *mp;
491	greg	2.3	int r, c;
492	greg	2.30	size_t n, rv;
493	greg	2.2
494	greg	2.21	if (!cm)
495			return(0);
496			mp = cm->cmem;
497	greg	2.2	switch (dtype) {
498			case DTascii:
499	greg	2.3	for (r = 0; r < cm->nrows; r++)
500	greg	2.2	for (c = 0; c < cm->ncols; c++, mp += 3)
501	greg	2.3	fprintf(fp, "%.6e %.6e %.6e%c",
502			mp[0], mp[1], mp[2],
503			tabEOL[c >= cm->ncols-1]);
504	greg	2.2	break;
505			case DTfloat:
506			case DTdouble:
507			if (sizeof(COLOR) == cm_elem_size[dtype]) {
508	greg	2.30	n = (size_t)cm->ncols*cm->nrows;
509			while (n > 0) {
510			rv = fwrite(mp, sizeof(COLOR), n, fp);
511			if (rv <= 0)
512	greg	2.2	return(0);
513	greg	2.30	mp += 3*rv;
514			n -= rv;
515	greg	2.2	}
516			} else if (dtype == DTdouble) {
517			double dc[3];
518	greg	2.30	n = (size_t)cm->ncols*cm->nrows;
519			while (n--) {
520	greg	2.2	copycolor(dc, mp);
521	greg	2.17	if (putbinary(dc, sizeof(double), 3, fp) != 3)
522	greg	2.2	return(0);
523			mp += 3;
524			}
525			} else /* dtype == DTfloat */ {
526			float fc[3];
527	greg	2.30	n = (size_t)cm->ncols*cm->nrows;
528			while (n--) {
529	greg	2.2	copycolor(fc, mp);
530	greg	2.17	if (putbinary(fc, sizeof(float), 3, fp) != 3)
531	greg	2.2	return(0);
532			mp += 3;
533			}
534			}
535			break;
536			case DTrgbe:
537			case DTxyze:
538			fprtresolu(cm->ncols, cm->nrows, fp);
539			for (r = 0; r < cm->nrows; r++, mp += 3*cm->ncols)
540			if (fwritescan((COLOR *)mp, cm->ncols, fp) < 0)
541			return(0);
542			break;
543			default:
544			fputs("Unsupported data type in cm_write()!\n", stderr);
545			return(0);
546	greg	2.1	}
547	greg	2.2	return(fflush(fp) == 0);
548	greg	2.1	}