src/util/cmatrix.c

#ifndef lint
static const char RCSid[] = "$Id: cmatrix.c,v 2.22 2019/08/14 18:20:02 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      *cm_fmt_id[] = {
                        "unknown", "ascii", COLRFMT, CIEFMT,
                        "float", "double"
                };

const int       cm_elem_size[] = {
                        0, 0, 4, 4, 3*sizeof(float), 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)*(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)*(cm->nrows*cm->ncols - 1);
        adjacent_ra_sizes(ra_bounds, old_size);
        new_size = sizeof(CMATRIX) + sizeof(COLOR)*(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 */
        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 (!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, FILE *fp)
{
        CMINFO  cmi;
                                                /* read header */
        cmi.dtype = DTfromHeader;
        cmi.need2swap = 0;
        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;
        return(NULL);
}

/* Allocate and load image data into matrix */
static CMATRIX *
cm_load_rgbe(FILE *fp, int nrows, int ncols)
{
        CMATRIX *cm;
        COLORV  *mp;
                                                /* header already loaded */
        if ((nrows <= 0) | (ncols <= 0) && !fscnresolu(&ncols, &nrows, fp)) {
                error(USER, "bad picture resolution string");
                return(NULL);
        }
        cm = cm_alloc(nrows, ncols);
        if (!cm)
                return(NULL);
        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);
                }
                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;
        FILE            *fp = stdin;
        int             swap = 0;
        CMATRIX         *cm;

        if (!inspec)
                inspec = "<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, fp);
                if (err)
                        error(USER, err);
                if (ncols <= 0)
                        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);
                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 ((dtype != DTascii) & (fp != stdin) & (inspec[0] != '!')) {
                        long    startpos = ftell(fp);
                        if (fseek(fp, 0L, SEEK_END) == 0) {
                                long    endpos = ftell(fp);
                                long    elemsiz = 3*(dtype==DTfloat ?
                                            sizeof(float) : sizeof(double));

                                if ((endpos - startpos) % (ncols*elemsiz)) {
                                        sprintf(errmsg,
                                        "improper length for binary file '%s'",
                                                        inspec);
                                        error(USER, errmsg);
                                }
                                guessrows = (endpos - startpos)/(ncols*elemsiz);
                                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]) {
                        int     nread = 0;
                        do {                            /* read all we can */
                                nread += getbinary(cm->cmem + 3*nread,
                                                sizeof(COLOR),
                                                cm->nrows*cm->ncols - nread,
                                                fp);
                                if (nrows <= 0) {       /* unknown length */
                                        if (nread == 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 < cm->nrows*cm->ncols)
                                        goto EOFerror;
                        } while (nread < cm->nrows*cm->ncols);

                } else if (dtype == DTdouble) {
                        double  dc[3];                  /* load from double */
                        COLORV  *cvp = cm->cmem;
                        int     n = nrows*ncols;

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

                        if (n <= 0)
                                goto not_handled;
                        while (n--) {
                                if (getbinary(fc, sizeof(float), 3, fp) != 3)
                                        goto EOFerror;
                                copycolor(cvp, fc);
                                cvp += 3;
                        }
                }
                if (fgetc(fp) != EOF) {
                                sprintf(errmsg,
                                "unexpected data at end of binary input '%s'",
                                                inspec);
                                error(WARNING, errmsg);
                }
        }
        if (swap) {
                if (dtype == DTfloat)
                        swap32((char *)cm->cmem, 3*cm->nrows*cm->ncols);
                else if (dtype == DTdouble)
                        swap64((char *)cm->cmem, 3*cm->nrows*cm->ncols);
        }
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;

        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]) {
                        r = cm->ncols*cm->nrows;
                        while (r > 0) {
                                c = putbinary(mp, sizeof(COLOR), r, fp);
                                if (c <= 0)
                                        return(0);
                                mp += 3*c;
                                r -= c;
                        }
                } else if (dtype == DTdouble) {
                        double  dc[3];
                        r = cm->ncols*cm->nrows;
                        while (r--) {
                                copycolor(dc, mp);
                                if (putbinary(dc, sizeof(double), 3, fp) != 3)
                                        return(0);
                                mp += 3;
                        }
                } else /* dtype == DTfloat */ {
                        float   fc[3];
                        r = cm->ncols*cm->nrows;
                        while (r--) {
                                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:	2.23
Committed:	Wed Oct 23 17:00:14 2019 UTC (4 years, 6 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.22:	+33 -1 lines
Log Message:	Added support for RGBE picture i/o to dctimestep
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.23	static const char RCSid[] = "$Id: cmatrix.c,v 2.22 2019/08/14 18:20:02 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			const char *cm_fmt_id[] = {
19	greg	2.8	"unknown", "ascii", COLRFMT, CIEFMT,
20			"float", "double"
21	greg	2.2	};
22
23			const int cm_elem_size[] = {
24	greg	2.19	0, 0, 4, 4, 3sizeof(float), 3sizeof(double)
25	greg	2.2	};
26	greg	2.1
27			/* Allocate a color coefficient matrix */
28			CMATRIX *
29			cm_alloc(int nrows, int ncols)
30			{
31			CMATRIX *cm;
32
33			if ((nrows <= 0) \| (ncols <= 0))
34			error(USER, "attempt to create empty matrix");
35			cm = (CMATRIX *)malloc(sizeof(CMATRIX) +
36	greg	2.4	sizeof(COLOR)(nrowsncols - 1));
37	greg	2.21	if (!cm)
38	greg	2.1	error(SYSTEM, "out of memory in cm_alloc()");
39			cm->nrows = nrows;
40			cm->ncols = ncols;
41			return(cm);
42			}
43
44	greg	2.6	static void
45			adjacent_ra_sizes(size_t bounds[2], size_t target)
46			{
47			bounds[0] = 0; bounds[1] = 2048;
48			while (bounds[1] < target) {
49			bounds[0] = bounds[1];
50			bounds[1] += bounds[1]>>1;
51			}
52			}
53
54	greg	2.1	/* Resize color coefficient matrix */
55			CMATRIX *
56			cm_resize(CMATRIX *cm, int nrows)
57			{
58	greg	2.6	size_t old_size, new_size, ra_bounds[2];
59
60	greg	2.21	if (!cm)
61			return(NULL);
62	greg	2.1	if (nrows == cm->nrows)
63			return(cm);
64			if (nrows <= 0) {
65			cm_free(cm);
66			return(NULL);
67			}
68	greg	2.6	old_size = sizeof(CMATRIX) + sizeof(COLOR)(cm->nrowscm->ncols - 1);
69			adjacent_ra_sizes(ra_bounds, old_size);
70			new_size = sizeof(CMATRIX) + sizeof(COLOR)(nrowscm->ncols - 1);
71			if (nrows < cm->nrows ? new_size <= ra_bounds[0] :
72			new_size > ra_bounds[1]) {
73			adjacent_ra_sizes(ra_bounds, new_size);
74			cm = (CMATRIX *)realloc(cm, ra_bounds[1]);
75	greg	2.21	if (!cm)
76	greg	2.6	error(SYSTEM, "out of memory in cm_resize()");
77			}
78	greg	2.1	cm->nrows = nrows;
79			return(cm);
80			}
81
82	greg	2.5	typedef struct {
83			int dtype; /* data type */
84	greg	2.22	int need2swap; /* need byte swap? */
85	greg	2.5	int nrows, ncols; /* matrix size */
86			char err; / error message */
87			} CMINFO; /* header info record */
88
89	greg	2.1	static int
90	greg	2.5	get_cminfo(char s, void p)
91	greg	2.1	{
92	greg	2.5	CMINFO ip = (CMINFO )p;
93	greg	2.20	char fmt[MAXFMTLEN];
94	greg	2.2	int i;
95	greg	2.5
96			if (!strncmp(s, "NCOMP=", 6) && atoi(s+6) != 3) {
97			ip->err = "unexpected # components (must be 3)";
98			return(-1);
99			}
100			if (!strncmp(s, "NROWS=", 6)) {
101			ip->nrows = atoi(s+6);
102			return(0);
103			}
104			if (!strncmp(s, "NCOLS=", 6)) {
105			ip->ncols = atoi(s+6);
106			return(0);
107			}
108	greg	2.22	if ((i = isbigendian(s)) >= 0) {
109			ip->need2swap = (nativebigendian() != i);
110			return(0);
111			}
112	greg	2.2	if (!formatval(fmt, s))
113			return(0);
114			for (i = 1; i < DTend; i++)
115			if (!strcmp(fmt, cm_fmt_id[i]))
116	greg	2.5	ip->dtype = i;
117	greg	2.1	return(0);
118			}
119
120	greg	2.5	/* Load header to obtain/check data type and number of columns */
121			char *
122	greg	2.22	cm_getheader(int dt, int nr, int nc, int swp, FILE *fp)
123	greg	2.1	{
124	greg	2.5	CMINFO cmi;
125			/* read header */
126			cmi.dtype = DTfromHeader;
127	greg	2.22	cmi.need2swap = 0;
128	greg	2.5	cmi.nrows = cmi.ncols = 0;
129			cmi.err = "unexpected EOF in header";
130	greg	2.7	if (getheader(fp, get_cminfo, &cmi) < 0)
131	greg	2.5	return(cmi.err);
132	greg	2.21	if (dt) { /* get/check data type? */
133	greg	2.5	if (cmi.dtype == DTfromHeader) {
134			if (*dt == DTfromHeader)
135			return("missing/unknown data format in header");
136			} else if (*dt == DTfromHeader)
137			*dt = cmi.dtype;
138			else if (*dt != cmi.dtype)
139			return("unexpected data format in header");
140			}
141	greg	2.21	if (nr) { /* get/check #rows? */
142	greg	2.5	if (*nr <= 0)
143			*nr = cmi.nrows;
144			else if ((cmi.nrows > 0) & (*nr != cmi.nrows))
145			return("unexpected row count in header");
146			}
147	greg	2.21	if (nc) { /* get/check #columns? */
148	greg	2.5	if (*nc <= 0)
149			*nc = cmi.ncols;
150			else if ((cmi.ncols > 0) & (*nc != cmi.ncols))
151			return("unexpected column count in header");
152			}
153	greg	2.22	if (swp) /* get/check swap? */
154			*swp = cmi.need2swap;
155	greg	2.5	return(NULL);
156	greg	2.1	}
157
158	greg	2.23	/* Allocate and load image data into matrix */
159			static CMATRIX *
160			cm_load_rgbe(FILE *fp, int nrows, int ncols)
161			{
162			CMATRIX *cm;
163			COLORV *mp;
164			/* header already loaded */
165			if ((nrows <= 0) \| (ncols <= 0) && !fscnresolu(&ncols, &nrows, fp)) {
166			error(USER, "bad picture resolution string");
167			return(NULL);
168			}
169			cm = cm_alloc(nrows, ncols);
170			if (!cm)
171			return(NULL);
172			mp = cm->cmem;
173			while (nrows--) {
174			if (freadscan((COLOR *)mp, ncols, fp) < 0) {
175			error(USER, "error reading color picture as matrix");
176			cm_free(cm);
177			return(NULL);
178			}
179			mp += 3*ncols;
180			} /* caller closes stream */
181			return(cm);
182			}
183
184	greg	2.9	/* Allocate and load a matrix from the given input (or stdin if NULL) */
185	greg	2.1	CMATRIX *
186	greg	2.9	cm_load(const char *inspec, int nrows, int ncols, int dtype)
187	greg	2.1	{
188	greg	2.15	const int ROWINC = 2048;
189			FILE *fp = stdin;
190	greg	2.22	int swap = 0;
191	greg	2.15	CMATRIX *cm;
192	greg	2.1
193	greg	2.21	if (!inspec)
194	greg	2.9	inspec = "<stdin>";
195			else if (inspec[0] == '!') {
196			fp = popen(inspec+1, "r");
197	greg	2.21	if (!fp) {
198	greg	2.9	sprintf(errmsg, "cannot start command '%s'", inspec);
199			error(SYSTEM, errmsg);
200			}
201	greg	2.21	} else if (!(fp = fopen(inspec, "r"))) {
202	greg	2.9	sprintf(errmsg, "cannot open file '%s'", inspec);
203	greg	2.1	error(SYSTEM, errmsg);
204			}
205			#ifdef getc_unlocked
206			flockfile(fp);
207			#endif
208			if (dtype != DTascii)
209			SET_FILE_BINARY(fp); /* doesn't really work */
210	greg	2.5	if (!dtype \| !ncols) { /* expecting header? */
211	greg	2.22	char *err = cm_getheader(&dtype, &nrows, &ncols, &swap, fp);
212	greg	2.21	if (err)
213	greg	2.5	error(USER, err);
214			if (ncols <= 0)
215			error(USER, "unspecified number of columns");
216			}
217	greg	2.1	switch (dtype) {
218			case DTascii:
219			case DTfloat:
220			case DTdouble:
221			break;
222	greg	2.23	case DTrgbe:
223			case DTxyze:
224			cm = cm_load_rgbe(fp, nrows, ncols);
225			goto cleanup;
226	greg	2.1	default:
227			error(USER, "unexpected data type in cm_load()");
228			}
229			if (nrows <= 0) { /* don't know length? */
230			int guessrows = 147; /* usually big enough */
231	greg	2.9	if ((dtype != DTascii) & (fp != stdin) & (inspec[0] != '!')) {
232	greg	2.1	long startpos = ftell(fp);
233			if (fseek(fp, 0L, SEEK_END) == 0) {
234			long endpos = ftell(fp);
235			long elemsiz = 3*(dtype==DTfloat ?
236			sizeof(float) : sizeof(double));
237
238			if ((endpos - startpos) % (ncols*elemsiz)) {
239			sprintf(errmsg,
240			"improper length for binary file '%s'",
241	greg	2.9	inspec);
242	greg	2.1	error(USER, errmsg);
243			}
244			guessrows = (endpos - startpos)/(ncols*elemsiz);
245			if (fseek(fp, startpos, SEEK_SET) < 0) {
246			sprintf(errmsg,
247			"fseek() error on file '%s'",
248	greg	2.9	inspec);
249	greg	2.1	error(SYSTEM, errmsg);
250			}
251			nrows = guessrows; /* we're confident */
252			}
253			}
254			cm = cm_alloc(guessrows, ncols);
255			} else
256			cm = cm_alloc(nrows, ncols);
257	greg	2.21	if (!cm) /* XXX never happens */
258	greg	2.1	return(NULL);
259			if (dtype == DTascii) { /* read text file */
260			int maxrow = (nrows > 0 ? nrows : 32000);
261			int r, c;
262			for (r = 0; r < maxrow; r++) {
263			if (r >= cm->nrows) /* need more space? */
264	greg	2.15	cm = cm_resize(cm, cm->nrows+ROWINC);
265	greg	2.1	for (c = 0; c < ncols; c++) {
266			COLORV *cv = cm_lval(cm,r,c);
267	greg	2.13	if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3) {
268	greg	2.1	if ((nrows <= 0) & (r > 0) & !c) {
269			cm = cm_resize(cm, maxrow=r);
270			break;
271			} else
272			goto EOFerror;
273	greg	2.13	}
274	greg	2.1	}
275			}
276			while ((c = getc(fp)) != EOF)
277			if (!isspace(c)) {
278			sprintf(errmsg,
279	greg	2.9	"unexpected data at end of ascii input '%s'",
280			inspec);
281	greg	2.1	error(WARNING, errmsg);
282			break;
283			}
284			} else { /* read binary file */
285	greg	2.2	if (sizeof(COLOR) == cm_elem_size[dtype]) {
286	greg	2.1	int nread = 0;
287			do { /* read all we can */
288	greg	2.17	nread += getbinary(cm->cmem + 3*nread,
289	greg	2.4	sizeof(COLOR),
290	greg	2.1	cm->nrows*cm->ncols - nread,
291			fp);
292			if (nrows <= 0) { /* unknown length */
293			if (nread == cm->nrows*cm->ncols)
294			/* need more space? */
295	greg	2.15	cm = cm_resize(cm, cm->nrows+ROWINC);
296	greg	2.1	else if (nread && !(nread % cm->ncols))
297			/* seem to be done */
298			cm = cm_resize(cm, nread/cm->ncols);
299			else /* ended mid-row */
300			goto EOFerror;
301			} else if (nread < cm->nrows*cm->ncols)
302			goto EOFerror;
303			} while (nread < cm->nrows*cm->ncols);
304
305			} else if (dtype == DTdouble) {
306			double dc[3]; /* load from double */
307			COLORV *cvp = cm->cmem;
308			int n = nrows*ncols;
309
310			if (n <= 0)
311			goto not_handled;
312			while (n--) {
313	greg	2.17	if (getbinary(dc, sizeof(double), 3, fp) != 3)
314	greg	2.1	goto EOFerror;
315			copycolor(cvp, dc);
316			cvp += 3;
317			}
318			} else /* dtype == DTfloat */ {
319			float fc[3]; /* load from float */
320			COLORV *cvp = cm->cmem;
321			int n = nrows*ncols;
322
323			if (n <= 0)
324			goto not_handled;
325			while (n--) {
326	greg	2.17	if (getbinary(fc, sizeof(float), 3, fp) != 3)
327	greg	2.1	goto EOFerror;
328			copycolor(cvp, fc);
329			cvp += 3;
330			}
331			}
332			if (fgetc(fp) != EOF) {
333			sprintf(errmsg,
334	greg	2.9	"unexpected data at end of binary input '%s'",
335			inspec);
336	greg	2.1	error(WARNING, errmsg);
337			}
338			}
339	greg	2.22	if (swap) {
340			if (dtype == DTfloat)
341			swap32((char )cm->cmem, 3cm->nrows*cm->ncols);
342			else if (dtype == DTdouble)
343			swap64((char )cm->cmem, 3cm->nrows*cm->ncols);
344			}
345	greg	2.23	cleanup:
346	greg	2.9	if (fp != stdin) {
347			if (inspec[0] != '!')
348			fclose(fp);
349			else if (pclose(fp)) {
350			sprintf(errmsg, "error running command '%s'", inspec);
351			error(WARNING, errmsg);
352			}
353			}
354	greg	2.1	#ifdef getc_unlocked
355			else
356			funlockfile(fp);
357			#endif
358			return(cm);
359			EOFerror:
360	greg	2.9	sprintf(errmsg, "unexpected EOF reading %s", inspec);
361	greg	2.1	error(USER, errmsg);
362	greg	2.23	return(NULL);
363	greg	2.1	not_handled:
364			error(INTERNAL, "unhandled data size or length in cm_load()");
365			return(NULL); /* gratis return */
366			}
367
368			/* Extract a column vector from a matrix */
369			CMATRIX *
370			cm_column(const CMATRIX *cm, int c)
371			{
372			CMATRIX *cvr;
373			int dr;
374
375	greg	2.21	if (!cm)
376			return(NULL);
377	greg	2.1	if ((c < 0) \| (c >= cm->ncols))
378			error(INTERNAL, "column requested outside matrix");
379			cvr = cm_alloc(cm->nrows, 1);
380	greg	2.21	if (!cvr)
381	greg	2.1	return(NULL);
382			for (dr = 0; dr < cm->nrows; dr++) {
383			const COLORV *sp = cm_lval(cm,dr,c);
384			COLORV *dp = cv_lval(cvr,dr);
385			dp[0] = sp[0];
386			dp[1] = sp[1];
387			dp[2] = sp[2];
388			}
389			return(cvr);
390			}
391
392			/* Multiply two matrices (or a matrix and a vector) and allocate the result */
393			CMATRIX *
394			cm_multiply(const CMATRIX cm1, const CMATRIX cm2)
395			{
396			char rowcheck=NULL, colcheck=NULL;
397			CMATRIX *cmr;
398			int dr, dc, i;
399
400	greg	2.21	if (!cm1 \| !cm2)
401			return(NULL);
402	greg	2.1	if ((cm1->ncols <= 0) \| (cm1->ncols != cm2->nrows))
403			error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
404			cmr = cm_alloc(cm1->nrows, cm2->ncols);
405	greg	2.21	if (!cmr)
406	greg	2.1	return(NULL);
407			/* optimization: check for zero rows & cols */
408			if (((cm1->nrows > 5) \| (cm2->ncols > 5)) & (cm1->ncols > 5)) {
409			static const COLOR czero;
410			rowcheck = (char *)calloc(cmr->nrows, 1);
411			for (dr = cm1->nrows*(rowcheck != NULL); dr--; )
412			for (dc = cm1->ncols; dc--; )
413			if (memcmp(cm_lval(cm1,dr,dc), czero, sizeof(COLOR))) {
414			rowcheck[dr] = 1;
415			break;
416			}
417			colcheck = (char *)calloc(cmr->ncols, 1);
418			for (dc = cm2->ncols*(colcheck != NULL); dc--; )
419			for (dr = cm2->nrows; dr--; )
420			if (memcmp(cm_lval(cm2,dr,dc), czero, sizeof(COLOR))) {
421			colcheck[dc] = 1;
422			break;
423			}
424			}
425			for (dr = 0; dr < cmr->nrows; dr++)
426			for (dc = 0; dc < cmr->ncols; dc++) {
427			COLORV *dp = cm_lval(cmr,dr,dc);
428	greg	2.4	double res[3];
429	greg	2.1	dp[0] = dp[1] = dp[2] = 0;
430	greg	2.21	if (rowcheck && !rowcheck[dr])
431	greg	2.1	continue;
432	greg	2.21	if (colcheck && !colcheck[dc])
433	greg	2.1	continue;
434	greg	2.4	res[0] = res[1] = res[2] = 0;
435	greg	2.1	for (i = 0; i < cm1->ncols; i++) {
436			const COLORV *cp1 = cm_lval(cm1,dr,i);
437			const COLORV *cp2 = cm_lval(cm2,i,dc);
438	greg	2.18	res[0] += (double)cp1[0] * cp2[0];
439			res[1] += (double)cp1[1] * cp2[1];
440			res[2] += (double)cp1[2] * cp2[2];
441	greg	2.1	}
442	greg	2.4	copycolor(dp, res);
443	greg	2.1	}
444	greg	2.21	if (rowcheck) free(rowcheck);
445			if (colcheck) free(colcheck);
446	greg	2.1	return(cmr);
447			}
448
449	greg	2.2	/* write out matrix to file (precede by resolution string if picture) */
450			int
451			cm_write(const CMATRIX cm, int dtype, FILE fp)
452	greg	2.1	{
453	greg	2.3	static const char tabEOL[2] = {'\t','\n'};
454	greg	2.21	const COLORV *mp;
455	greg	2.3	int r, c;
456	greg	2.2
457	greg	2.21	if (!cm)
458			return(0);
459			mp = cm->cmem;
460	greg	2.2	switch (dtype) {
461			case DTascii:
462	greg	2.3	for (r = 0; r < cm->nrows; r++)
463	greg	2.2	for (c = 0; c < cm->ncols; c++, mp += 3)
464	greg	2.3	fprintf(fp, "%.6e %.6e %.6e%c",
465			mp[0], mp[1], mp[2],
466			tabEOL[c >= cm->ncols-1]);
467	greg	2.2	break;
468			case DTfloat:
469			case DTdouble:
470			if (sizeof(COLOR) == cm_elem_size[dtype]) {
471			r = cm->ncols*cm->nrows;
472			while (r > 0) {
473	greg	2.17	c = putbinary(mp, sizeof(COLOR), r, fp);
474	greg	2.2	if (c <= 0)
475			return(0);
476			mp += 3*c;
477			r -= c;
478			}
479			} else if (dtype == DTdouble) {
480			double dc[3];
481			r = cm->ncols*cm->nrows;
482			while (r--) {
483			copycolor(dc, mp);
484	greg	2.17	if (putbinary(dc, sizeof(double), 3, fp) != 3)
485	greg	2.2	return(0);
486			mp += 3;
487			}
488			} else /* dtype == DTfloat */ {
489			float fc[3];
490			r = cm->ncols*cm->nrows;
491			while (r--) {
492			copycolor(fc, mp);
493	greg	2.17	if (putbinary(fc, sizeof(float), 3, fp) != 3)
494	greg	2.2	return(0);
495			mp += 3;
496			}
497			}
498			break;
499			case DTrgbe:
500			case DTxyze:
501			fprtresolu(cm->ncols, cm->nrows, fp);
502			for (r = 0; r < cm->nrows; r++, mp += 3*cm->ncols)
503			if (fwritescan((COLOR *)mp, cm->ncols, fp) < 0)
504			return(0);
505			break;
506			default:
507			fputs("Unsupported data type in cm_write()!\n", stderr);
508			return(0);
509	greg	2.1	}
510	greg	2.2	return(fflush(fp) == 0);
511	greg	2.1	}