src/util/rmatrix.c

#ifndef lint
static const char RCSid[] = "$Id: rmatrix.c,v 2.38 2019/09/10 17:22:55 greg Exp $";
#endif
/*
 * General matrix operations.
 */

#include <stdlib.h>
#include <errno.h>
#include "rtio.h"
#include "platform.h"
#include "resolu.h"
#include "paths.h"
#include "rmatrix.h"

static char     rmx_mismatch_warn[] = "WARNING: data type mismatch\n";

/* Allocate a nr x nc matrix with n components */
RMATRIX *
rmx_alloc(int nr, int nc, int n)
{
        RMATRIX *dnew;

        if ((nr <= 0) | (nc <= 0) | (n <= 0))
                return(NULL);
        dnew = (RMATRIX *)malloc(sizeof(RMATRIX)-sizeof(dnew->mtx) +
                                        sizeof(dnew->mtx[0])*(n*nr*nc));
        if (!dnew)
                return(NULL);
        dnew->nrows = nr; dnew->ncols = nc; dnew->ncomp = n;
        dnew->dtype = DTdouble;
        dnew->swapin = 0;
        dnew->info = NULL;
        return(dnew);
}

/* Free a RMATRIX array */
void
rmx_free(RMATRIX *rm)
{
        if (!rm) return;
        if (rm->info)
                free(rm->info);
        free(rm);
}

/* Resolve data type based on two input types (returns 0 for mismatch) */
int
rmx_newtype(int dtyp1, int dtyp2)
{
        if ((dtyp1==DTxyze) | (dtyp1==DTrgbe) |
                        (dtyp2==DTxyze) | (dtyp2==DTrgbe)
                        && dtyp1 != dtyp2)
                return(0);
        if (dtyp1 < dtyp2)
                return(dtyp1);
        return(dtyp2);
}

/* Append header information associated with matrix data */
int
rmx_addinfo(RMATRIX *rm, const char *info)
{
        if (!rm || !info || !*info)
                return(0);
        if (!rm->info) {
                rm->info = (char *)malloc(strlen(info)+1);
                if (rm->info) rm->info[0] = '\0';
        } else
                rm->info = (char *)realloc(rm->info,
                                strlen(rm->info)+strlen(info)+1);
        if (!rm->info)
                return(0);
        strcat(rm->info, info);
        return(1);
}

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

        if (headidval(fmt, s))
                return(0);
        if (!strncmp(s, "NCOMP=", 6)) {
                ip->ncomp = atoi(s+6);
                return(0);
        }
        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->swapin = (nativebigendian() != i);
                return(0);
        }
        if (!formatval(fmt, s)) {
                rmx_addinfo(ip, s);
                return(0);
        }
        for (i = 1; i < DTend; i++)
                if (!strcmp(fmt, cm_fmt_id[i])) {
                        ip->dtype = i;
                        return(0);
                }
        return(-1);
}

static int
rmx_load_ascii(RMATRIX *rm, FILE *fp)
{
        int     i, j, k;

        for (i = 0; i < rm->nrows; i++)
            for (j = 0; j < rm->ncols; j++)
                for (k = 0; k < rm->ncomp; k++)
                    if (fscanf(fp, "%lf", &rmx_lval(rm,i,j,k)) != 1)
                        return(0);
        return(1);
}

static int
rmx_load_float(RMATRIX *rm, FILE *fp)
{
        int     i, j, k;
        float   val[100];

        if (rm->ncomp > 100) {
                fputs("Unsupported # components in rmx_load_float()\n", stderr);
                exit(1);
        }
        for (i = 0; i < rm->nrows; i++)
            for (j = 0; j < rm->ncols; j++) {
                if (getbinary(val, sizeof(val[0]), rm->ncomp, fp) != rm->ncomp)
                    return(0);
                if (rm->swapin)
                    swap32((char *)val, rm->ncomp);
                for (k = rm->ncomp; k--; )
                     rmx_lval(rm,i,j,k) = val[k];
            }
        return(1);
}

static int
rmx_load_double(RMATRIX *rm, FILE *fp)
{
        int     i, j;

        for (i = 0; i < rm->nrows; i++)
            for (j = 0; j < rm->ncols; j++) {
                if (getbinary(&rmx_lval(rm,i,j,0), sizeof(double), rm->ncomp, fp) != rm->ncomp)
                    return(0);
                if (rm->swapin)
                    swap64((char *)&rmx_lval(rm,i,j,0), rm->ncomp);
            }
        return(1);
}

static int
rmx_load_rgbe(RMATRIX *rm, FILE *fp)
{
        COLOR   *scan = (COLOR *)malloc(sizeof(COLOR)*rm->ncols);
        int     i, j;

        if (!scan)
                return(0);
        for (i = 0; i < rm->nrows; i++) {
            if (freadscan(scan, rm->ncols, fp) < 0) {
                free(scan);
                return(0);
            }
            for (j = rm->ncols; j--; ) {
                rmx_lval(rm,i,j,0) = colval(scan[j],RED);
                rmx_lval(rm,i,j,1) = colval(scan[j],GRN);
                rmx_lval(rm,i,j,2) = colval(scan[j],BLU);
            }
        }
        free(scan);
        return(1);
}

/* Load matrix from supported file type */
RMATRIX *
rmx_load(const char *inspec)
{
        FILE            *fp = stdin;
        RMATRIX         dinfo;
        RMATRIX         *dnew;

        if (!inspec) {                          /* reading from stdin? */
                inspec = "<stdin>";
                SET_FILE_BINARY(stdin);
        } else if (inspec[0] == '!') {
                if (!(fp = popen(inspec+1, "r")))
                        return(NULL);
                SET_FILE_BINARY(fp);
        } else {
                const char      *sp = inspec;   /* check suffix */
                while (*sp)
                        ++sp;
                while (sp > inspec && sp[-1] != '.')
                        --sp;
                if (!strcasecmp(sp, "XML")) {   /* assume it's a BSDF */
                        CMATRIX *cm = cm_loadBTDF((char *)inspec);
                        if (!cm)
                                return(NULL);
                        dnew = rmx_from_cmatrix(cm);
                        cm_free(cm);
                        dnew->dtype = DTascii;
                        return(dnew);
                }
                                                /* else open it ourselves */
                if (!(fp = fopen(inspec, "rb")))
                        return(NULL);
        }
#ifdef getc_unlocked
        flockfile(fp);
#endif
        dinfo.nrows = dinfo.ncols = dinfo.ncomp = 0;
        dinfo.dtype = DTascii;                  /* assumed w/o FORMAT */
        dinfo.swapin = 0;
        dinfo.info = NULL;
        if (getheader(fp, get_dminfo, &dinfo) < 0) {
                fclose(fp);
                return(NULL);
        }
        if ((dinfo.nrows <= 0) | (dinfo.ncols <= 0)) {
                if (!fscnresolu(&dinfo.ncols, &dinfo.nrows, fp)) {
                        fclose(fp);
                        return(NULL);
                }
                if (dinfo.ncomp <= 0)
                        dinfo.ncomp = 3;
                else if ((dinfo.dtype == DTrgbe) | (dinfo.dtype == DTxyze) &&
                                dinfo.ncomp != 3) {
                        fclose(fp);
                        return(NULL);
                }
        }
        dnew = rmx_alloc(dinfo.nrows, dinfo.ncols, dinfo.ncomp);
        if (!dnew) {
                fclose(fp);
                return(NULL);
        }
        dnew->info = dinfo.info;
        switch (dinfo.dtype) {
        case DTascii:
                SET_FILE_TEXT(fp);
                if (!rmx_load_ascii(dnew, fp))
                        goto loaderr;
                dnew->dtype = DTascii;          /* should leave double? */
                break;
        case DTfloat:
                dnew->swapin = dinfo.swapin;
                if (!rmx_load_float(dnew, fp))
                        goto loaderr;
                dnew->dtype = DTfloat;
                break;
        case DTdouble:
                dnew->swapin = dinfo.swapin;
                if (!rmx_load_double(dnew, fp))
                        goto loaderr;
                dnew->dtype = DTdouble;
                break;
        case DTrgbe:
        case DTxyze:
                if (!rmx_load_rgbe(dnew, fp))
                        goto loaderr;
                dnew->dtype = dinfo.dtype;
                break;
        default:
                goto loaderr;
        }
        if (fp != stdin) {
                if (inspec[0] == '!')
                        pclose(fp);
                else
                        fclose(fp);
        }
#ifdef getc_unlocked
        else
                funlockfile(fp);
#endif
        return(dnew);
loaderr:                                        /* should report error? */
        if (inspec[0] == '!')
                pclose(fp);
        else
                fclose(fp);
        rmx_free(dnew);
        return(NULL);
}

static int
rmx_write_ascii(const RMATRIX *rm, FILE *fp)
{
        const char      *fmt = (rm->dtype == DTfloat) ? " %.7e" :
                        (rm->dtype == DTrgbe) | (rm->dtype == DTxyze) ? " %.3e" :
                                " %.15e" ;
        int     i, j, k;

        for (i = 0; i < rm->nrows; i++) {
            for (j = 0; j < rm->ncols; j++) {
                for (k = 0; k < rm->ncomp; k++)
                    fprintf(fp, fmt, rmx_lval(rm,i,j,k));
                fputc('\t', fp);
            }
            fputc('\n', fp);
        }
        return(1);
}

static int
rmx_write_float(const RMATRIX *rm, FILE *fp)
{
        int     i, j, k;
        float   val[100];

        if (rm->ncomp > 100) {
                fputs("Unsupported # components in rmx_write_float()\n", stderr);
                exit(1);
        }
        for (i = 0; i < rm->nrows; i++)
            for (j = 0; j < rm->ncols; j++) {
                for (k = rm->ncomp; k--; )
                    val[k] = (float)rmx_lval(rm,i,j,k);
                if (putbinary(val, sizeof(val[0]), rm->ncomp, fp) != rm->ncomp)
                        return(0);
            }
        return(1);
}

static int
rmx_write_double(const RMATRIX *rm, FILE *fp)
{
        int     i, j;

        for (i = 0; i < rm->nrows; i++)
            for (j = 0; j < rm->ncols; j++)
                if (putbinary(&rmx_lval(rm,i,j,0), sizeof(double), rm->ncomp, fp) != rm->ncomp)
                        return(0);
        return(1);
}

static int
rmx_write_rgbe(const RMATRIX *rm, FILE *fp)
{
        COLR    *scan = (COLR *)malloc(sizeof(COLR)*rm->ncols);
        int     i, j;

        if (!scan)
                return(0);
        for (i = 0; i < rm->nrows; i++) {
            for (j = rm->ncols; j--; )
                setcolr(scan[j],        rmx_lval(rm,i,j,0),
                                        rmx_lval(rm,i,j,1),
                                        rmx_lval(rm,i,j,2)      );
            if (fwritecolrs(scan, rm->ncols, fp) < 0) {
                free(scan);
                return(0);
            }
        }
        free(scan);
        return(1);
}

/* Write matrix to file type indicated by dtype */
int
rmx_write(const RMATRIX *rm, int dtype, FILE *fp)
{
        RMATRIX *mydm = NULL;
        int     ok = 1;

        if (!rm | !fp)
                return(0);
#ifdef getc_unlocked
        flockfile(fp);
#endif
                                                /* complete header */
        if (rm->info)
                fputs(rm->info, fp);
        if (dtype == DTfromHeader)
                dtype = rm->dtype;
        else if ((dtype == DTrgbe) & (rm->dtype == DTxyze))
                dtype = DTxyze;
        else if ((dtype == DTxyze) & (rm->dtype == DTrgbe))
                dtype = DTrgbe;
        if ((dtype != DTrgbe) & (dtype != DTxyze)) {
                fprintf(fp, "NROWS=%d\n", rm->nrows);
                fprintf(fp, "NCOLS=%d\n", rm->ncols);
                fprintf(fp, "NCOMP=%d\n", rm->ncomp);
        } else if (rm->ncomp != 3) {            /* wrong # components? */
                double  cmtx[3];
                if (rm->ncomp != 1)             /* only convert grayscale */
                        return(0);
                cmtx[0] = cmtx[1] = cmtx[2] = 1;
                mydm = rmx_transform(rm, 3, cmtx);
                if (!mydm)
                        return(0);
                rm = mydm;
        }
        if ((dtype == DTfloat) | (dtype == DTdouble))
                fputendian(fp);                 /* important to record */
        fputformat((char *)cm_fmt_id[dtype], fp);
        fputc('\n', fp);
        switch (dtype) {                        /* write data */
        case DTascii:
                ok = rmx_write_ascii(rm, fp);
                break;
        case DTfloat:
                ok = rmx_write_float(rm, fp);
                break;
        case DTdouble:
                ok = rmx_write_double(rm, fp);
                break;
        case DTrgbe:
        case DTxyze:
                fprtresolu(rm->ncols, rm->nrows, fp);
                ok = rmx_write_rgbe(rm, fp);
                break;
        default:
                return(0);
        }
        ok &= (fflush(fp) == 0);
#ifdef getc_unlocked
        funlockfile(fp);
#endif
        if (mydm)
                rmx_free(mydm);
        return(ok);
}

/* Allocate and assign square identity matrix with n components */
RMATRIX *
rmx_identity(const int dim, const int n)
{
        RMATRIX *rid = rmx_alloc(dim, dim, n);
        int     i, k;

        if (!rid)
                return(NULL);
        memset(rid->mtx, 0, sizeof(rid->mtx[0])*n*dim*dim);
        for (i = dim; i--; )
            for (k = n; k--; )
                rmx_lval(rid,i,i,k) = 1;
        return(rid);
}

/* Duplicate the given matrix */
RMATRIX *
rmx_copy(const RMATRIX *rm)
{
        RMATRIX *dnew;

        if (!rm)
                return(NULL);
        dnew = rmx_alloc(rm->nrows, rm->ncols, rm->ncomp);
        if (!dnew)
                return(NULL);
        rmx_addinfo(dnew, rm->info);
        dnew->dtype = rm->dtype;
        memcpy(dnew->mtx, rm->mtx,
                sizeof(rm->mtx[0])*rm->ncomp*rm->nrows*rm->ncols);
        return(dnew);
}

/* Allocate and assign transposed matrix */
RMATRIX *
rmx_transpose(const RMATRIX *rm)
{
        RMATRIX *dnew;
        int     i, j, k;

        if (!rm)
                return(0);
        if ((rm->nrows == 1) | (rm->ncols == 1)) {
                dnew = rmx_copy(rm);
                if (!dnew)
                        return(NULL);
                dnew->nrows = rm->ncols;
                dnew->ncols = rm->nrows;
                return(dnew);
        }
        dnew = rmx_alloc(rm->ncols, rm->nrows, rm->ncomp);
        if (!dnew)
                return(NULL);
        if (rm->info) {
                rmx_addinfo(dnew, rm->info);
                rmx_addinfo(dnew, "Transposed rows and columns\n");
        }
        dnew->dtype = rm->dtype;
        for (i = dnew->nrows; i--; )
            for (j = dnew->ncols; j--; )
                for (k = dnew->ncomp; k--; )
                        rmx_lval(dnew,i,j,k) = rmx_lval(rm,j,i,k);
        return(dnew);
}

/* Multiply (concatenate) two matrices and allocate the result */
RMATRIX *
rmx_multiply(const RMATRIX *m1, const RMATRIX *m2)
{
        RMATRIX *mres;
        int     i, j, k, h;

        if (!m1 | !m2 || (m1->ncomp != m2->ncomp) | (m1->ncols != m2->nrows))
                return(NULL);
        mres = rmx_alloc(m1->nrows, m2->ncols, m1->ncomp);
        if (!mres)
                return(NULL);
        i = rmx_newtype(m1->dtype, m2->dtype);
        if (i)
                mres->dtype = i;
        else
                rmx_addinfo(mres, rmx_mismatch_warn);
        for (i = mres->nrows; i--; )
            for (j = mres->ncols; j--; )
                for (k = mres->ncomp; k--; ) {
                    long double d = 0;
                    for (h = m1->ncols; h--; )
                        d += rmx_lval(m1,i,h,k) * rmx_lval(m2,h,j,k);
                    rmx_lval(mres,i,j,k) = (double)d;
                }
        return(mres);
}

/* Element-wise multiplication (or division) of m2 into m1 */
int
rmx_elemult(RMATRIX *m1, const RMATRIX *m2, int divide)
{
        int     zeroDivides = 0;
        int     i, j, k;

        if (!m1 | !m2 || (m1->ncols != m2->ncols) | (m1->nrows != m2->nrows))
                return(0);
        if ((m2->ncomp > 1) & (m2->ncomp != m1->ncomp))
                return(0);
        i = rmx_newtype(m1->dtype, m2->dtype);
        if (i)
                m1->dtype = i;
        else
                rmx_addinfo(m1, rmx_mismatch_warn);
        for (i = m1->nrows; i--; )
            for (j = m1->ncols; j--; )
                if (divide) {
                    double      d;
                    if (m2->ncomp == 1) {
                        d = rmx_lval(m2,i,j,0);
                        if (d == 0) {
                            ++zeroDivides;
                            for (k = m1->ncomp; k--; )
                                rmx_lval(m1,i,j,k) = 0;
                        } else {
                            d = 1./d;
                            for (k = m1->ncomp; k--; )
                                rmx_lval(m1,i,j,k) *= d;
                        }
                    } else
                        for (k = m1->ncomp; k--; ) {
                            d = rmx_lval(m2,i,j,k);
                            if (d == 0) {
                                ++zeroDivides;
                                rmx_lval(m1,i,j,k) = 0;
                            } else
                                rmx_lval(m1,i,j,k) /= d;
                        }
                } else {
                    if (m2->ncomp == 1) {
                        const double    d = rmx_lval(m2,i,j,0);
                        for (k = m1->ncomp; k--; )
                            rmx_lval(m1,i,j,k) *= d;
                    } else
                        for (k = m1->ncomp; k--; )
                            rmx_lval(m1,i,j,k) *= rmx_lval(m2,i,j,k);
                }
        if (zeroDivides) {
                rmx_addinfo(m1, "WARNING: zero divide(s) corrupted results\n");
                errno = ERANGE;
        }
        return(1);
}

/* Sum second matrix into first, applying scale factor beforehand */
int
rmx_sum(RMATRIX *msum, const RMATRIX *madd, const double sf[])
{
        double  *mysf = NULL;
        int     i, j, k;

        if (!msum | !madd ||
                        (msum->nrows != madd->nrows) |
                        (msum->ncols != madd->ncols) |
                        (msum->ncomp != madd->ncomp))
                return(0);
        if (!sf) {
                mysf = (double *)malloc(sizeof(double)*msum->ncomp);
                if (!mysf)
                        return(0);
                for (k = msum->ncomp; k--; )
                        mysf[k] = 1;
                sf = mysf;
        }
        i = rmx_newtype(msum->dtype, madd->dtype);
        if (i)
                msum->dtype = i;
        else
                rmx_addinfo(msum, rmx_mismatch_warn);
        for (i = msum->nrows; i--; )
            for (j = msum->ncols; j--; )
                for (k = msum->ncomp; k--; )
                     rmx_lval(msum,i,j,k) += sf[k] * rmx_lval(madd,i,j,k);
        if (mysf)
                free(mysf);
        return(1);
}

/* Scale the given matrix by the indicated scalar component vector */
int
rmx_scale(RMATRIX *rm, const double sf[])
{
        int     i, j, k;

        if (!rm | !sf)
                return(0);
        for (i = rm->nrows; i--; )
            for (j = rm->ncols; j--; )
                for (k = rm->ncomp; k--; )
                    rmx_lval(rm,i,j,k) *= sf[k];

        if (rm->info)
                rmx_addinfo(rm, "Applied scalar\n");
        return(1);
}

/* Allocate new matrix and apply component transformation */
RMATRIX *
rmx_transform(const RMATRIX *msrc, int n, const double cmat[])
{
        int     i, j, ks, kd;
        RMATRIX *dnew;

        if (!msrc | (n <= 0) | !cmat)
                return(NULL);
        dnew = rmx_alloc(msrc->nrows, msrc->ncols, n);
        if (!dnew)
                return(NULL);
        if (msrc->info) {
                char    buf[128];
                sprintf(buf, "Applied %dx%d component transform\n",
                                dnew->ncomp, msrc->ncomp);
                rmx_addinfo(dnew, msrc->info);
                rmx_addinfo(dnew, buf);
        }
        dnew->dtype = msrc->dtype;
        for (i = dnew->nrows; i--; )
            for (j = dnew->ncols; j--; )
                for (kd = dnew->ncomp; kd--; ) {
                    double      d = 0;
                    for (ks = msrc->ncomp; ks--; )
                        d += cmat[kd*msrc->ncomp + ks] * rmx_lval(msrc,i,j,ks);
                    rmx_lval(dnew,i,j,kd) = d;
                }
        return(dnew);
}

/* Convert a color matrix to newly allocated RMATRIX buffer */
RMATRIX *
rmx_from_cmatrix(const CMATRIX *cm)
{
        int     i, j;
        RMATRIX *dnew;

        if (!cm)
                return(NULL);
        dnew = rmx_alloc(cm->nrows, cm->ncols, 3);
        if (!dnew)
                return(NULL);
        dnew->dtype = DTfloat;
        for (i = dnew->nrows; i--; )
            for (j = dnew->ncols; j--; ) {
                const COLORV    *cv = cm_lval(cm,i,j);
                rmx_lval(dnew,i,j,0) = cv[0];
                rmx_lval(dnew,i,j,1) = cv[1];
                rmx_lval(dnew,i,j,2) = cv[2];
            }
        return(dnew);
}

/* Convert general matrix to newly allocated CMATRIX buffer */
CMATRIX *
cm_from_rmatrix(const RMATRIX *rm)
{
        int     i, j;
        CMATRIX *cnew;

        if (!rm || rm->ncomp != 3)
                return(NULL);
        cnew = cm_alloc(rm->nrows, rm->ncols);
        if (!cnew)
                return(NULL);
        for (i = cnew->nrows; i--; )
            for (j = cnew->ncols; j--; ) {
                COLORV  *cv = cm_lval(cnew,i,j);
                cv[0] = (COLORV)rmx_lval(rm,i,j,0);
                cv[1] = (COLORV)rmx_lval(rm,i,j,1);
                cv[2] = (COLORV)rmx_lval(rm,i,j,2);
            }
        return(cnew);
}
Revision:	2.39
Committed:	Sat Dec 28 18:05:14 2019 UTC (4 years, 3 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.38:	+1 -4 lines
Log Message:	Removed redundant include files
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.39	static const char RCSid[] = "$Id: rmatrix.c,v 2.38 2019/09/10 17:22:55 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* General matrix operations.
6			*/
7
8			#include <stdlib.h>
9	greg	2.25	#include <errno.h>
10	greg	2.21	#include "rtio.h"
11	schorsch	2.20	#include "platform.h"
12	greg	2.1	#include "resolu.h"
13	greg	2.19	#include "paths.h"
14	greg	2.1	#include "rmatrix.h"
15
16	greg	2.6	static char rmx_mismatch_warn[] = "WARNING: data type mismatch\n";
17	greg	2.1
18			/* Allocate a nr x nc matrix with n components */
19			RMATRIX *
20			rmx_alloc(int nr, int nc, int n)
21			{
22			RMATRIX *dnew;
23
24			if ((nr <= 0) \| (nc <= 0) \| (n <= 0))
25			return(NULL);
26			dnew = (RMATRIX *)malloc(sizeof(RMATRIX)-sizeof(dnew->mtx) +
27			sizeof(dnew->mtx[0])(nnr*nc));
28	greg	2.33	if (!dnew)
29	greg	2.1	return(NULL);
30			dnew->nrows = nr; dnew->ncols = nc; dnew->ncomp = n;
31	greg	2.6	dnew->dtype = DTdouble;
32	greg	2.36	dnew->swapin = 0;
33	greg	2.5	dnew->info = NULL;
34	greg	2.1	return(dnew);
35			}
36
37	greg	2.6	/* Free a RMATRIX array */
38			void
39			rmx_free(RMATRIX *rm)
40			{
41			if (!rm) return;
42			if (rm->info)
43			free(rm->info);
44			free(rm);
45			}
46
47			/* Resolve data type based on two input types (returns 0 for mismatch) */
48			int
49			rmx_newtype(int dtyp1, int dtyp2)
50			{
51	greg	2.14	if ((dtyp1==DTxyze) \| (dtyp1==DTrgbe) \|
52			(dtyp2==DTxyze) \| (dtyp2==DTrgbe)
53			&& dtyp1 != dtyp2)
54	greg	2.6	return(0);
55			if (dtyp1 < dtyp2)
56			return(dtyp1);
57			return(dtyp2);
58			}
59
60	greg	2.5	/* Append header information associated with matrix data */
61			int
62			rmx_addinfo(RMATRIX rm, const char info)
63			{
64	greg	2.33	if (!rm \|\| !info \|\| !*info)
65	greg	2.5	return(0);
66	greg	2.8	if (!rm->info) {
67	greg	2.5	rm->info = (char *)malloc(strlen(info)+1);
68	greg	2.8	if (rm->info) rm->info[0] = '\0';
69			} else
70	greg	2.5	rm->info = (char *)realloc(rm->info,
71			strlen(rm->info)+strlen(info)+1);
72			if (!rm->info)
73			return(0);
74			strcat(rm->info, info);
75			return(1);
76			}
77
78	greg	2.1	static int
79			get_dminfo(char s, void p)
80			{
81	greg	2.6	RMATRIX ip = (RMATRIX )p;
82	greg	2.29	char fmt[MAXFMTLEN];
83	greg	2.1	int i;
84
85	greg	2.6	if (headidval(fmt, s))
86			return(0);
87	greg	2.1	if (!strncmp(s, "NCOMP=", 6)) {
88			ip->ncomp = atoi(s+6);
89			return(0);
90			}
91			if (!strncmp(s, "NROWS=", 6)) {
92			ip->nrows = atoi(s+6);
93			return(0);
94			}
95			if (!strncmp(s, "NCOLS=", 6)) {
96			ip->ncols = atoi(s+6);
97			return(0);
98			}
99	greg	2.35	if ((i = isbigendian(s)) >= 0) {
100			ip->swapin = (nativebigendian() != i);
101			return(0);
102			}
103	greg	2.5	if (!formatval(fmt, s)) {
104	greg	2.6	rmx_addinfo(ip, s);
105	greg	2.1	return(0);
106	greg	2.5	}
107	greg	2.1	for (i = 1; i < DTend; i++)
108			if (!strcmp(fmt, cm_fmt_id[i])) {
109			ip->dtype = i;
110			return(0);
111			}
112			return(-1);
113			}
114
115			static int
116			rmx_load_ascii(RMATRIX rm, FILE fp)
117			{
118			int i, j, k;
119	greg	2.17
120	greg	2.1	for (i = 0; i < rm->nrows; i++)
121			for (j = 0; j < rm->ncols; j++)
122			for (k = 0; k < rm->ncomp; k++)
123			if (fscanf(fp, "%lf", &rmx_lval(rm,i,j,k)) != 1)
124			return(0);
125			return(1);
126			}
127
128			static int
129			rmx_load_float(RMATRIX rm, FILE fp)
130			{
131			int i, j, k;
132			float val[100];
133
134			if (rm->ncomp > 100) {
135			fputs("Unsupported # components in rmx_load_float()\n", stderr);
136			exit(1);
137			}
138			for (i = 0; i < rm->nrows; i++)
139			for (j = 0; j < rm->ncols; j++) {
140	greg	2.21	if (getbinary(val, sizeof(val[0]), rm->ncomp, fp) != rm->ncomp)
141	greg	2.1	return(0);
142	greg	2.35	if (rm->swapin)
143			swap32((char *)val, rm->ncomp);
144	greg	2.1	for (k = rm->ncomp; k--; )
145			rmx_lval(rm,i,j,k) = val[k];
146			}
147			return(1);
148			}
149
150			static int
151			rmx_load_double(RMATRIX rm, FILE fp)
152			{
153	greg	2.26	int i, j;
154	greg	2.1
155			for (i = 0; i < rm->nrows; i++)
156	greg	2.35	for (j = 0; j < rm->ncols; j++) {
157	greg	2.26	if (getbinary(&rmx_lval(rm,i,j,0), sizeof(double), rm->ncomp, fp) != rm->ncomp)
158	greg	2.1	return(0);
159	greg	2.35	if (rm->swapin)
160			swap64((char *)&rmx_lval(rm,i,j,0), rm->ncomp);
161			}
162	greg	2.1	return(1);
163			}
164
165			static int
166			rmx_load_rgbe(RMATRIX rm, FILE fp)
167			{
168			COLOR scan = (COLOR )malloc(sizeof(COLOR)*rm->ncols);
169			int i, j;
170
171	greg	2.33	if (!scan)
172	greg	2.1	return(0);
173			for (i = 0; i < rm->nrows; i++) {
174			if (freadscan(scan, rm->ncols, fp) < 0) {
175			free(scan);
176			return(0);
177			}
178			for (j = rm->ncols; j--; ) {
179			rmx_lval(rm,i,j,0) = colval(scan[j],RED);
180			rmx_lval(rm,i,j,1) = colval(scan[j],GRN);
181			rmx_lval(rm,i,j,2) = colval(scan[j],BLU);
182			}
183			}
184			free(scan);
185			return(1);
186			}
187
188			/* Load matrix from supported file type */
189			RMATRIX *
190	greg	2.13	rmx_load(const char *inspec)
191	greg	2.1	{
192			FILE *fp = stdin;
193	greg	2.6	RMATRIX dinfo;
194	greg	2.1	RMATRIX *dnew;
195
196	greg	2.33	if (!inspec) { /* reading from stdin? */
197	greg	2.13	inspec = "<stdin>";
198	greg	2.22	SET_FILE_BINARY(stdin);
199	greg	2.13	} else if (inspec[0] == '!') {
200	greg	2.33	if (!(fp = popen(inspec+1, "r")))
201	greg	2.13	return(NULL);
202	greg	2.37	SET_FILE_BINARY(fp);
203	greg	2.1	} else {
204	greg	2.13	const char sp = inspec; / check suffix */
205	greg	2.1	while (*sp)
206			++sp;
207	greg	2.13	while (sp > inspec && sp[-1] != '.')
208	greg	2.1	--sp;
209			if (!strcasecmp(sp, "XML")) { /* assume it's a BSDF */
210	greg	2.13	CMATRIX cm = cm_loadBTDF((char )inspec);
211	greg	2.33	if (!cm)
212	greg	2.1	return(NULL);
213			dnew = rmx_from_cmatrix(cm);
214			cm_free(cm);
215	greg	2.18	dnew->dtype = DTascii;
216	greg	2.1	return(dnew);
217			}
218			/* else open it ourselves */
219	greg	2.33	if (!(fp = fopen(inspec, "rb")))
220	greg	2.1	return(NULL);
221			}
222			#ifdef getc_unlocked
223			flockfile(fp);
224			#endif
225			dinfo.nrows = dinfo.ncols = dinfo.ncomp = 0;
226	greg	2.6	dinfo.dtype = DTascii; /* assumed w/o FORMAT */
227	greg	2.35	dinfo.swapin = 0;
228	greg	2.6	dinfo.info = NULL;
229	greg	2.3	if (getheader(fp, get_dminfo, &dinfo) < 0) {
230	greg	2.1	fclose(fp);
231			return(NULL);
232			}
233	greg	2.4	if ((dinfo.nrows <= 0) \| (dinfo.ncols <= 0)) {
234	greg	2.1	if (!fscnresolu(&dinfo.ncols, &dinfo.nrows, fp)) {
235			fclose(fp);
236			return(NULL);
237			}
238	greg	2.4	if (dinfo.ncomp <= 0)
239			dinfo.ncomp = 3;
240			else if ((dinfo.dtype == DTrgbe) \| (dinfo.dtype == DTxyze) &&
241			dinfo.ncomp != 3) {
242			fclose(fp);
243			return(NULL);
244			}
245	greg	2.1	}
246			dnew = rmx_alloc(dinfo.nrows, dinfo.ncols, dinfo.ncomp);
247	greg	2.33	if (!dnew) {
248	greg	2.1	fclose(fp);
249			return(NULL);
250			}
251	greg	2.6	dnew->info = dinfo.info;
252	greg	2.1	switch (dinfo.dtype) {
253			case DTascii:
254	greg	2.37	SET_FILE_TEXT(fp);
255	greg	2.1	if (!rmx_load_ascii(dnew, fp))
256			goto loaderr;
257	greg	2.11	dnew->dtype = DTascii; /* should leave double? */
258	greg	2.1	break;
259			case DTfloat:
260	greg	2.35	dnew->swapin = dinfo.swapin;
261	greg	2.1	if (!rmx_load_float(dnew, fp))
262			goto loaderr;
263	greg	2.6	dnew->dtype = DTfloat;
264	greg	2.1	break;
265			case DTdouble:
266	greg	2.35	dnew->swapin = dinfo.swapin;
267	greg	2.1	if (!rmx_load_double(dnew, fp))
268			goto loaderr;
269	greg	2.6	dnew->dtype = DTdouble;
270	greg	2.1	break;
271			case DTrgbe:
272			case DTxyze:
273			if (!rmx_load_rgbe(dnew, fp))
274			goto loaderr;
275	greg	2.6	dnew->dtype = dinfo.dtype;
276	greg	2.1	break;
277			default:
278			goto loaderr;
279			}
280	greg	2.13	if (fp != stdin) {
281			if (inspec[0] == '!')
282			pclose(fp);
283			else
284			fclose(fp);
285			}
286			#ifdef getc_unlocked
287			else
288			funlockfile(fp);
289			#endif
290	greg	2.1	return(dnew);
291			loaderr: /* should report error? */
292	greg	2.13	if (inspec[0] == '!')
293			pclose(fp);
294			else
295			fclose(fp);
296	greg	2.1	rmx_free(dnew);
297			return(NULL);
298			}
299
300			static int
301			rmx_write_ascii(const RMATRIX rm, FILE fp)
302			{
303	greg	2.30	const char *fmt = (rm->dtype == DTfloat) ? " %.7e" :
304			(rm->dtype == DTrgbe) \| (rm->dtype == DTxyze) ? " %.3e" :
305			" %.15e" ;
306	greg	2.1	int i, j, k;
307	greg	2.17
308	greg	2.1	for (i = 0; i < rm->nrows; i++) {
309			for (j = 0; j < rm->ncols; j++) {
310			for (k = 0; k < rm->ncomp; k++)
311	greg	2.30	fprintf(fp, fmt, rmx_lval(rm,i,j,k));
312	greg	2.1	fputc('\t', fp);
313			}
314			fputc('\n', fp);
315			}
316			return(1);
317			}
318
319			static int
320			rmx_write_float(const RMATRIX rm, FILE fp)
321			{
322			int i, j, k;
323			float val[100];
324
325			if (rm->ncomp > 100) {
326			fputs("Unsupported # components in rmx_write_float()\n", stderr);
327			exit(1);
328			}
329			for (i = 0; i < rm->nrows; i++)
330			for (j = 0; j < rm->ncols; j++) {
331			for (k = rm->ncomp; k--; )
332			val[k] = (float)rmx_lval(rm,i,j,k);
333	greg	2.21	if (putbinary(val, sizeof(val[0]), rm->ncomp, fp) != rm->ncomp)
334	greg	2.1	return(0);
335			}
336			return(1);
337			}
338
339			static int
340			rmx_write_double(const RMATRIX rm, FILE fp)
341			{
342	greg	2.26	int i, j;
343	greg	2.1
344			for (i = 0; i < rm->nrows; i++)
345	greg	2.26	for (j = 0; j < rm->ncols; j++)
346			if (putbinary(&rmx_lval(rm,i,j,0), sizeof(double), rm->ncomp, fp) != rm->ncomp)
347	greg	2.1	return(0);
348			return(1);
349			}
350
351			static int
352			rmx_write_rgbe(const RMATRIX rm, FILE fp)
353			{
354	greg	2.27	COLR scan = (COLR )malloc(sizeof(COLR)*rm->ncols);
355	greg	2.1	int i, j;
356
357	greg	2.33	if (!scan)
358	greg	2.1	return(0);
359			for (i = 0; i < rm->nrows; i++) {
360			for (j = rm->ncols; j--; )
361	greg	2.27	setcolr(scan[j], rmx_lval(rm,i,j,0),
362	greg	2.1	rmx_lval(rm,i,j,1),
363			rmx_lval(rm,i,j,2) );
364	greg	2.27	if (fwritecolrs(scan, rm->ncols, fp) < 0) {
365	greg	2.1	free(scan);
366			return(0);
367			}
368			}
369			free(scan);
370			return(1);
371			}
372
373	greg	2.6	/* Write matrix to file type indicated by dtype */
374	greg	2.10	int
375	greg	2.1	rmx_write(const RMATRIX rm, int dtype, FILE fp)
376			{
377			RMATRIX *mydm = NULL;
378			int ok = 1;
379
380	greg	2.33	if (!rm \| !fp)
381	greg	2.1	return(0);
382	greg	2.17	#ifdef getc_unlocked
383			flockfile(fp);
384			#endif
385	greg	2.1	/* complete header */
386	greg	2.5	if (rm->info)
387			fputs(rm->info, fp);
388	greg	2.6	if (dtype == DTfromHeader)
389			dtype = rm->dtype;
390			else if ((dtype == DTrgbe) & (rm->dtype == DTxyze))
391			dtype = DTxyze;
392	greg	2.9	else if ((dtype == DTxyze) & (rm->dtype == DTrgbe))
393	greg	2.6	dtype = DTrgbe;
394	greg	2.1	if ((dtype != DTrgbe) & (dtype != DTxyze)) {
395			fprintf(fp, "NROWS=%d\n", rm->nrows);
396			fprintf(fp, "NCOLS=%d\n", rm->ncols);
397			fprintf(fp, "NCOMP=%d\n", rm->ncomp);
398			} else if (rm->ncomp != 3) { /* wrong # components? */
399			double cmtx[3];
400			if (rm->ncomp != 1) /* only convert grayscale */
401			return(0);
402			cmtx[0] = cmtx[1] = cmtx[2] = 1;
403			mydm = rmx_transform(rm, 3, cmtx);
404	greg	2.33	if (!mydm)
405	greg	2.1	return(0);
406			rm = mydm;
407			}
408	greg	2.35	if ((dtype == DTfloat) \| (dtype == DTdouble))
409			fputendian(fp); /* important to record */
410	greg	2.1	fputformat((char *)cm_fmt_id[dtype], fp);
411			fputc('\n', fp);
412			switch (dtype) { /* write data */
413			case DTascii:
414			ok = rmx_write_ascii(rm, fp);
415			break;
416			case DTfloat:
417			ok = rmx_write_float(rm, fp);
418			break;
419			case DTdouble:
420			ok = rmx_write_double(rm, fp);
421			break;
422			case DTrgbe:
423			case DTxyze:
424			fprtresolu(rm->ncols, rm->nrows, fp);
425			ok = rmx_write_rgbe(rm, fp);
426			break;
427			default:
428			return(0);
429			}
430			ok &= (fflush(fp) == 0);
431	greg	2.17	#ifdef getc_unlocked
432			funlockfile(fp);
433			#endif
434	greg	2.33	if (mydm)
435			rmx_free(mydm);
436	greg	2.10	return(ok);
437	greg	2.1	}
438
439			/* Allocate and assign square identity matrix with n components */
440			RMATRIX *
441			rmx_identity(const int dim, const int n)
442			{
443			RMATRIX *rid = rmx_alloc(dim, dim, n);
444	greg	2.12	int i, k;
445	greg	2.1
446	greg	2.33	if (!rid)
447	greg	2.1	return(NULL);
448	greg	2.12	memset(rid->mtx, 0, sizeof(rid->mtx[0])ndim*dim);
449	greg	2.1	for (i = dim; i--; )
450	greg	2.12	for (k = n; k--; )
451			rmx_lval(rid,i,i,k) = 1;
452	greg	2.1	return(rid);
453			}
454
455			/* Duplicate the given matrix */
456			RMATRIX *
457			rmx_copy(const RMATRIX *rm)
458			{
459			RMATRIX *dnew;
460
461	greg	2.33	if (!rm)
462	greg	2.1	return(NULL);
463			dnew = rmx_alloc(rm->nrows, rm->ncols, rm->ncomp);
464	greg	2.33	if (!dnew)
465	greg	2.1	return(NULL);
466	greg	2.5	rmx_addinfo(dnew, rm->info);
467	greg	2.6	dnew->dtype = rm->dtype;
468	greg	2.1	memcpy(dnew->mtx, rm->mtx,
469			sizeof(rm->mtx[0])rm->ncomprm->nrows*rm->ncols);
470			return(dnew);
471			}
472
473	greg	2.2	/* Allocate and assign transposed matrix */
474			RMATRIX *
475			rmx_transpose(const RMATRIX *rm)
476	greg	2.1	{
477	greg	2.2	RMATRIX *dnew;
478	greg	2.1	int i, j, k;
479
480	greg	2.33	if (!rm)
481	greg	2.1	return(0);
482	greg	2.31	if ((rm->nrows == 1) \| (rm->ncols == 1)) {
483			dnew = rmx_copy(rm);
484	greg	2.33	if (!dnew)
485	greg	2.32	return(NULL);
486	greg	2.31	dnew->nrows = rm->ncols;
487			dnew->ncols = rm->nrows;
488			return(dnew);
489			}
490	greg	2.2	dnew = rmx_alloc(rm->ncols, rm->nrows, rm->ncomp);
491	greg	2.33	if (!dnew)
492	greg	2.2	return(NULL);
493	greg	2.5	if (rm->info) {
494			rmx_addinfo(dnew, rm->info);
495			rmx_addinfo(dnew, "Transposed rows and columns\n");
496			}
497	greg	2.6	dnew->dtype = rm->dtype;
498	greg	2.2	for (i = dnew->nrows; i--; )
499			for (j = dnew->ncols; j--; )
500			for (k = dnew->ncomp; k--; )
501			rmx_lval(dnew,i,j,k) = rmx_lval(rm,j,i,k);
502			return(dnew);
503	greg	2.1	}
504
505			/* Multiply (concatenate) two matrices and allocate the result */
506			RMATRIX *
507			rmx_multiply(const RMATRIX m1, const RMATRIX m2)
508			{
509			RMATRIX *mres;
510			int i, j, k, h;
511
512	greg	2.33	if (!m1 \| !m2 \|\| (m1->ncomp != m2->ncomp) \| (m1->ncols != m2->nrows))
513	greg	2.1	return(NULL);
514			mres = rmx_alloc(m1->nrows, m2->ncols, m1->ncomp);
515	greg	2.33	if (!mres)
516	greg	2.1	return(NULL);
517	greg	2.6	i = rmx_newtype(m1->dtype, m2->dtype);
518			if (i)
519			mres->dtype = i;
520			else
521			rmx_addinfo(mres, rmx_mismatch_warn);
522	greg	2.1	for (i = mres->nrows; i--; )
523			for (j = mres->ncols; j--; )
524	greg	2.8	for (k = mres->ncomp; k--; ) {
525	greg	2.1	long double d = 0;
526	greg	2.8	for (h = m1->ncols; h--; )
527	greg	2.24	d += rmx_lval(m1,i,h,k) * rmx_lval(m2,h,j,k);
528	greg	2.1	rmx_lval(mres,i,j,k) = (double)d;
529			}
530			return(mres);
531			}
532
533	greg	2.25	/* Element-wise multiplication (or division) of m2 into m1 */
534			int
535			rmx_elemult(RMATRIX m1, const RMATRIX m2, int divide)
536			{
537			int zeroDivides = 0;
538			int i, j, k;
539
540	greg	2.33	if (!m1 \| !m2 \|\| (m1->ncols != m2->ncols) \| (m1->nrows != m2->nrows))
541	greg	2.25	return(0);
542			if ((m2->ncomp > 1) & (m2->ncomp != m1->ncomp))
543			return(0);
544			i = rmx_newtype(m1->dtype, m2->dtype);
545			if (i)
546			m1->dtype = i;
547			else
548			rmx_addinfo(m1, rmx_mismatch_warn);
549			for (i = m1->nrows; i--; )
550			for (j = m1->ncols; j--; )
551			if (divide) {
552			double d;
553			if (m2->ncomp == 1) {
554			d = rmx_lval(m2,i,j,0);
555			if (d == 0) {
556			++zeroDivides;
557			for (k = m1->ncomp; k--; )
558			rmx_lval(m1,i,j,k) = 0;
559			} else {
560			d = 1./d;
561			for (k = m1->ncomp; k--; )
562			rmx_lval(m1,i,j,k) *= d;
563			}
564			} else
565			for (k = m1->ncomp; k--; ) {
566			d = rmx_lval(m2,i,j,k);
567			if (d == 0) {
568			++zeroDivides;
569			rmx_lval(m1,i,j,k) = 0;
570			} else
571			rmx_lval(m1,i,j,k) /= d;
572			}
573			} else {
574			if (m2->ncomp == 1) {
575			const double d = rmx_lval(m2,i,j,0);
576			for (k = m1->ncomp; k--; )
577			rmx_lval(m1,i,j,k) *= d;
578			} else
579			for (k = m1->ncomp; k--; )
580			rmx_lval(m1,i,j,k) *= rmx_lval(m2,i,j,k);
581			}
582			if (zeroDivides) {
583	greg	2.34	rmx_addinfo(m1, "WARNING: zero divide(s) corrupted results\n");
584	greg	2.25	errno = ERANGE;
585			}
586			return(1);
587			}
588
589	greg	2.1	/* Sum second matrix into first, applying scale factor beforehand */
590			int
591			rmx_sum(RMATRIX msum, const RMATRIX madd, const double sf[])
592			{
593			double *mysf = NULL;
594			int i, j, k;
595
596	greg	2.33	if (!msum \| !madd \|\|
597	greg	2.1	(msum->nrows != madd->nrows) \|
598			(msum->ncols != madd->ncols) \|
599			(msum->ncomp != madd->ncomp))
600			return(0);
601	greg	2.33	if (!sf) {
602	greg	2.1	mysf = (double )malloc(sizeof(double)msum->ncomp);
603	greg	2.33	if (!mysf)
604	greg	2.1	return(0);
605			for (k = msum->ncomp; k--; )
606			mysf[k] = 1;
607			sf = mysf;
608			}
609	greg	2.6	i = rmx_newtype(msum->dtype, madd->dtype);
610			if (i)
611			msum->dtype = i;
612			else
613			rmx_addinfo(msum, rmx_mismatch_warn);
614	greg	2.1	for (i = msum->nrows; i--; )
615			for (j = msum->ncols; j--; )
616			for (k = msum->ncomp; k--; )
617			rmx_lval(msum,i,j,k) += sf[k] * rmx_lval(madd,i,j,k);
618	greg	2.33	if (mysf)
619			free(mysf);
620	greg	2.1	return(1);
621			}
622
623			/* Scale the given matrix by the indicated scalar component vector */
624			int
625			rmx_scale(RMATRIX *rm, const double sf[])
626			{
627			int i, j, k;
628
629	greg	2.33	if (!rm \| !sf)
630	greg	2.1	return(0);
631			for (i = rm->nrows; i--; )
632			for (j = rm->ncols; j--; )
633			for (k = rm->ncomp; k--; )
634			rmx_lval(rm,i,j,k) *= sf[k];
635
636	greg	2.28	if (rm->info)
637			rmx_addinfo(rm, "Applied scalar\n");
638	greg	2.1	return(1);
639			}
640
641			/* Allocate new matrix and apply component transformation */
642			RMATRIX *
643			rmx_transform(const RMATRIX *msrc, int n, const double cmat[])
644			{
645			int i, j, ks, kd;
646			RMATRIX *dnew;
647
648	greg	2.33	if (!msrc \| (n <= 0) \| !cmat)
649	greg	2.1	return(NULL);
650			dnew = rmx_alloc(msrc->nrows, msrc->ncols, n);
651	greg	2.33	if (!dnew)
652	greg	2.1	return(NULL);
653	greg	2.28	if (msrc->info) {
654			char buf[128];
655	greg	2.38	sprintf(buf, "Applied %dx%d component transform\n",
656	greg	2.28	dnew->ncomp, msrc->ncomp);
657			rmx_addinfo(dnew, msrc->info);
658			rmx_addinfo(dnew, buf);
659			}
660	greg	2.6	dnew->dtype = msrc->dtype;
661	greg	2.1	for (i = dnew->nrows; i--; )
662			for (j = dnew->ncols; j--; )
663			for (kd = dnew->ncomp; kd--; ) {
664			double d = 0;
665			for (ks = msrc->ncomp; ks--; )
666			d += cmat[kdmsrc->ncomp + ks] rmx_lval(msrc,i,j,ks);
667			rmx_lval(dnew,i,j,kd) = d;
668			}
669			return(dnew);
670			}
671
672			/* Convert a color matrix to newly allocated RMATRIX buffer */
673			RMATRIX *
674			rmx_from_cmatrix(const CMATRIX *cm)
675			{
676			int i, j;
677			RMATRIX *dnew;
678
679	greg	2.33	if (!cm)
680	greg	2.1	return(NULL);
681			dnew = rmx_alloc(cm->nrows, cm->ncols, 3);
682	greg	2.33	if (!dnew)
683	greg	2.1	return(NULL);
684	greg	2.6	dnew->dtype = DTfloat;
685	greg	2.1	for (i = dnew->nrows; i--; )
686			for (j = dnew->ncols; j--; ) {
687			const COLORV *cv = cm_lval(cm,i,j);
688			rmx_lval(dnew,i,j,0) = cv[0];
689			rmx_lval(dnew,i,j,1) = cv[1];
690			rmx_lval(dnew,i,j,2) = cv[2];
691			}
692			return(dnew);
693			}
694
695			/* Convert general matrix to newly allocated CMATRIX buffer */
696			CMATRIX *
697			cm_from_rmatrix(const RMATRIX *rm)
698			{
699			int i, j;
700			CMATRIX *cnew;
701
702	greg	2.33	if (!rm \|\| rm->ncomp != 3)
703	greg	2.1	return(NULL);
704			cnew = cm_alloc(rm->nrows, rm->ncols);
705	greg	2.33	if (!cnew)
706	greg	2.1	return(NULL);
707			for (i = cnew->nrows; i--; )
708			for (j = cnew->ncols; j--; ) {
709			COLORV *cv = cm_lval(cnew,i,j);
710			cv[0] = (COLORV)rmx_lval(rm,i,j,0);
711			cv[1] = (COLORV)rmx_lval(rm,i,j,1);
712			cv[2] = (COLORV)rmx_lval(rm,i,j,2);
713			}
714			return(cnew);
715			}