src/util/rmatrix.c

#ifndef lint
static const char RCSid[] = "$Id: rmatrix.c,v 2.34 2019/08/12 20:38:19 greg Exp $";
#endif
/*
 * General matrix operations.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.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->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(stdin);
        } 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(stdin);
                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 matrix 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:	2.35
Committed:	Wed Aug 14 18:20:02 2019 UTC (4 years, 8 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.34:	+16 -2 lines
Log Message:	Added explicit byte-swap checks in headers using BigEndian= line
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.35	static const char RCSid[] = "$Id: rmatrix.c,v 2.34 2019/08/12 20:38:19 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* General matrix operations.
6			*/
7
8			#include <stdio.h>
9			#include <stdlib.h>
10			#include <string.h>
11			#include <fcntl.h>
12	greg	2.25	#include <errno.h>
13	greg	2.21	#include "rtio.h"
14	schorsch	2.20	#include "platform.h"
15	greg	2.1	#include "resolu.h"
16	greg	2.19	#include "paths.h"
17	greg	2.1	#include "rmatrix.h"
18
19	greg	2.6	static char rmx_mismatch_warn[] = "WARNING: data type mismatch\n";
20	greg	2.1
21			/* Allocate a nr x nc matrix with n components */
22			RMATRIX *
23			rmx_alloc(int nr, int nc, int n)
24			{
25			RMATRIX *dnew;
26
27			if ((nr <= 0) \| (nc <= 0) \| (n <= 0))
28			return(NULL);
29			dnew = (RMATRIX *)malloc(sizeof(RMATRIX)-sizeof(dnew->mtx) +
30			sizeof(dnew->mtx[0])(nnr*nc));
31	greg	2.33	if (!dnew)
32	greg	2.1	return(NULL);
33			dnew->nrows = nr; dnew->ncols = nc; dnew->ncomp = n;
34	greg	2.6	dnew->dtype = DTdouble;
35	greg	2.5	dnew->info = NULL;
36	greg	2.1	return(dnew);
37			}
38
39	greg	2.6	/* Free a RMATRIX array */
40			void
41			rmx_free(RMATRIX *rm)
42			{
43			if (!rm) return;
44			if (rm->info)
45			free(rm->info);
46			free(rm);
47			}
48
49			/* Resolve data type based on two input types (returns 0 for mismatch) */
50			int
51			rmx_newtype(int dtyp1, int dtyp2)
52			{
53	greg	2.14	if ((dtyp1==DTxyze) \| (dtyp1==DTrgbe) \|
54			(dtyp2==DTxyze) \| (dtyp2==DTrgbe)
55			&& dtyp1 != dtyp2)
56	greg	2.6	return(0);
57			if (dtyp1 < dtyp2)
58			return(dtyp1);
59			return(dtyp2);
60			}
61
62	greg	2.5	/* Append header information associated with matrix data */
63			int
64			rmx_addinfo(RMATRIX rm, const char info)
65			{
66	greg	2.33	if (!rm \|\| !info \|\| !*info)
67	greg	2.5	return(0);
68	greg	2.8	if (!rm->info) {
69	greg	2.5	rm->info = (char *)malloc(strlen(info)+1);
70	greg	2.8	if (rm->info) rm->info[0] = '\0';
71			} else
72	greg	2.5	rm->info = (char *)realloc(rm->info,
73			strlen(rm->info)+strlen(info)+1);
74			if (!rm->info)
75			return(0);
76			strcat(rm->info, info);
77			return(1);
78			}
79
80	greg	2.1	static int
81			get_dminfo(char s, void p)
82			{
83	greg	2.6	RMATRIX ip = (RMATRIX )p;
84	greg	2.29	char fmt[MAXFMTLEN];
85	greg	2.1	int i;
86
87	greg	2.6	if (headidval(fmt, s))
88			return(0);
89	greg	2.1	if (!strncmp(s, "NCOMP=", 6)) {
90			ip->ncomp = atoi(s+6);
91			return(0);
92			}
93			if (!strncmp(s, "NROWS=", 6)) {
94			ip->nrows = atoi(s+6);
95			return(0);
96			}
97			if (!strncmp(s, "NCOLS=", 6)) {
98			ip->ncols = atoi(s+6);
99			return(0);
100			}
101	greg	2.35	if ((i = isbigendian(s)) >= 0) {
102			ip->swapin = (nativebigendian() != i);
103			return(0);
104			}
105	greg	2.5	if (!formatval(fmt, s)) {
106	greg	2.6	rmx_addinfo(ip, s);
107	greg	2.1	return(0);
108	greg	2.5	}
109	greg	2.1	for (i = 1; i < DTend; i++)
110			if (!strcmp(fmt, cm_fmt_id[i])) {
111			ip->dtype = i;
112			return(0);
113			}
114			return(-1);
115			}
116
117			static int
118			rmx_load_ascii(RMATRIX rm, FILE fp)
119			{
120			int i, j, k;
121	greg	2.17
122	greg	2.1	for (i = 0; i < rm->nrows; i++)
123			for (j = 0; j < rm->ncols; j++)
124			for (k = 0; k < rm->ncomp; k++)
125			if (fscanf(fp, "%lf", &rmx_lval(rm,i,j,k)) != 1)
126			return(0);
127			return(1);
128			}
129
130			static int
131			rmx_load_float(RMATRIX rm, FILE fp)
132			{
133			int i, j, k;
134			float val[100];
135
136			if (rm->ncomp > 100) {
137			fputs("Unsupported # components in rmx_load_float()\n", stderr);
138			exit(1);
139			}
140			for (i = 0; i < rm->nrows; i++)
141			for (j = 0; j < rm->ncols; j++) {
142	greg	2.21	if (getbinary(val, sizeof(val[0]), rm->ncomp, fp) != rm->ncomp)
143	greg	2.1	return(0);
144	greg	2.35	if (rm->swapin)
145			swap32((char *)val, rm->ncomp);
146	greg	2.1	for (k = rm->ncomp; k--; )
147			rmx_lval(rm,i,j,k) = val[k];
148			}
149			return(1);
150			}
151
152			static int
153			rmx_load_double(RMATRIX rm, FILE fp)
154			{
155	greg	2.26	int i, j;
156	greg	2.1
157			for (i = 0; i < rm->nrows; i++)
158	greg	2.35	for (j = 0; j < rm->ncols; j++) {
159	greg	2.26	if (getbinary(&rmx_lval(rm,i,j,0), sizeof(double), rm->ncomp, fp) != rm->ncomp)
160	greg	2.1	return(0);
161	greg	2.35	if (rm->swapin)
162			swap64((char *)&rmx_lval(rm,i,j,0), rm->ncomp);
163			}
164	greg	2.1	return(1);
165			}
166
167			static int
168			rmx_load_rgbe(RMATRIX rm, FILE fp)
169			{
170			COLOR scan = (COLOR )malloc(sizeof(COLOR)*rm->ncols);
171			int i, j;
172
173	greg	2.33	if (!scan)
174	greg	2.1	return(0);
175			for (i = 0; i < rm->nrows; i++) {
176			if (freadscan(scan, rm->ncols, fp) < 0) {
177			free(scan);
178			return(0);
179			}
180			for (j = rm->ncols; j--; ) {
181			rmx_lval(rm,i,j,0) = colval(scan[j],RED);
182			rmx_lval(rm,i,j,1) = colval(scan[j],GRN);
183			rmx_lval(rm,i,j,2) = colval(scan[j],BLU);
184			}
185			}
186			free(scan);
187			return(1);
188			}
189
190			/* Load matrix from supported file type */
191			RMATRIX *
192	greg	2.13	rmx_load(const char *inspec)
193	greg	2.1	{
194			FILE *fp = stdin;
195	greg	2.6	RMATRIX dinfo;
196	greg	2.1	RMATRIX *dnew;
197
198	greg	2.33	if (!inspec) { /* reading from stdin? */
199	greg	2.13	inspec = "<stdin>";
200	greg	2.22	SET_FILE_BINARY(stdin);
201	greg	2.13	} else if (inspec[0] == '!') {
202	greg	2.33	if (!(fp = popen(inspec+1, "r")))
203	greg	2.13	return(NULL);
204	greg	2.22	SET_FILE_BINARY(stdin);
205	greg	2.1	} else {
206	greg	2.13	const char sp = inspec; / check suffix */
207	greg	2.1	while (*sp)
208			++sp;
209	greg	2.13	while (sp > inspec && sp[-1] != '.')
210	greg	2.1	--sp;
211			if (!strcasecmp(sp, "XML")) { /* assume it's a BSDF */
212	greg	2.13	CMATRIX cm = cm_loadBTDF((char )inspec);
213	greg	2.33	if (!cm)
214	greg	2.1	return(NULL);
215			dnew = rmx_from_cmatrix(cm);
216			cm_free(cm);
217	greg	2.18	dnew->dtype = DTascii;
218	greg	2.1	return(dnew);
219			}
220			/* else open it ourselves */
221	greg	2.33	if (!(fp = fopen(inspec, "rb")))
222	greg	2.1	return(NULL);
223			}
224			#ifdef getc_unlocked
225			flockfile(fp);
226			#endif
227			dinfo.nrows = dinfo.ncols = dinfo.ncomp = 0;
228	greg	2.6	dinfo.dtype = DTascii; /* assumed w/o FORMAT */
229	greg	2.35	dinfo.swapin = 0;
230	greg	2.6	dinfo.info = NULL;
231	greg	2.3	if (getheader(fp, get_dminfo, &dinfo) < 0) {
232	greg	2.1	fclose(fp);
233			return(NULL);
234			}
235	greg	2.4	if ((dinfo.nrows <= 0) \| (dinfo.ncols <= 0)) {
236	greg	2.1	if (!fscnresolu(&dinfo.ncols, &dinfo.nrows, fp)) {
237			fclose(fp);
238			return(NULL);
239			}
240	greg	2.4	if (dinfo.ncomp <= 0)
241			dinfo.ncomp = 3;
242			else if ((dinfo.dtype == DTrgbe) \| (dinfo.dtype == DTxyze) &&
243			dinfo.ncomp != 3) {
244			fclose(fp);
245			return(NULL);
246			}
247	greg	2.1	}
248			dnew = rmx_alloc(dinfo.nrows, dinfo.ncols, dinfo.ncomp);
249	greg	2.33	if (!dnew) {
250	greg	2.1	fclose(fp);
251			return(NULL);
252			}
253	greg	2.6	dnew->info = dinfo.info;
254	greg	2.1	switch (dinfo.dtype) {
255			case DTascii:
256	greg	2.22	SET_FILE_TEXT(stdin);
257	greg	2.1	if (!rmx_load_ascii(dnew, fp))
258			goto loaderr;
259	greg	2.11	dnew->dtype = DTascii; /* should leave double? */
260	greg	2.1	break;
261			case DTfloat:
262	greg	2.35	dnew->swapin = dinfo.swapin;
263	greg	2.1	if (!rmx_load_float(dnew, fp))
264			goto loaderr;
265	greg	2.6	dnew->dtype = DTfloat;
266	greg	2.1	break;
267			case DTdouble:
268	greg	2.35	dnew->swapin = dinfo.swapin;
269	greg	2.1	if (!rmx_load_double(dnew, fp))
270			goto loaderr;
271	greg	2.6	dnew->dtype = DTdouble;
272	greg	2.1	break;
273			case DTrgbe:
274			case DTxyze:
275			if (!rmx_load_rgbe(dnew, fp))
276			goto loaderr;
277	greg	2.6	dnew->dtype = dinfo.dtype;
278	greg	2.1	break;
279			default:
280			goto loaderr;
281			}
282	greg	2.13	if (fp != stdin) {
283			if (inspec[0] == '!')
284			pclose(fp);
285			else
286			fclose(fp);
287			}
288			#ifdef getc_unlocked
289			else
290			funlockfile(fp);
291			#endif
292	greg	2.1	return(dnew);
293			loaderr: /* should report error? */
294	greg	2.13	if (inspec[0] == '!')
295			pclose(fp);
296			else
297			fclose(fp);
298	greg	2.1	rmx_free(dnew);
299			return(NULL);
300			}
301
302			static int
303			rmx_write_ascii(const RMATRIX rm, FILE fp)
304			{
305	greg	2.30	const char *fmt = (rm->dtype == DTfloat) ? " %.7e" :
306			(rm->dtype == DTrgbe) \| (rm->dtype == DTxyze) ? " %.3e" :
307			" %.15e" ;
308	greg	2.1	int i, j, k;
309	greg	2.17
310	greg	2.1	for (i = 0; i < rm->nrows; i++) {
311			for (j = 0; j < rm->ncols; j++) {
312			for (k = 0; k < rm->ncomp; k++)
313	greg	2.30	fprintf(fp, fmt, rmx_lval(rm,i,j,k));
314	greg	2.1	fputc('\t', fp);
315			}
316			fputc('\n', fp);
317			}
318			return(1);
319			}
320
321			static int
322			rmx_write_float(const RMATRIX rm, FILE fp)
323			{
324			int i, j, k;
325			float val[100];
326
327			if (rm->ncomp > 100) {
328			fputs("Unsupported # components in rmx_write_float()\n", stderr);
329			exit(1);
330			}
331			for (i = 0; i < rm->nrows; i++)
332			for (j = 0; j < rm->ncols; j++) {
333			for (k = rm->ncomp; k--; )
334			val[k] = (float)rmx_lval(rm,i,j,k);
335	greg	2.21	if (putbinary(val, sizeof(val[0]), rm->ncomp, fp) != rm->ncomp)
336	greg	2.1	return(0);
337			}
338			return(1);
339			}
340
341			static int
342			rmx_write_double(const RMATRIX rm, FILE fp)
343			{
344	greg	2.26	int i, j;
345	greg	2.1
346			for (i = 0; i < rm->nrows; i++)
347	greg	2.26	for (j = 0; j < rm->ncols; j++)
348			if (putbinary(&rmx_lval(rm,i,j,0), sizeof(double), rm->ncomp, fp) != rm->ncomp)
349	greg	2.1	return(0);
350			return(1);
351			}
352
353			static int
354			rmx_write_rgbe(const RMATRIX rm, FILE fp)
355			{
356	greg	2.27	COLR scan = (COLR )malloc(sizeof(COLR)*rm->ncols);
357	greg	2.1	int i, j;
358
359	greg	2.33	if (!scan)
360	greg	2.1	return(0);
361			for (i = 0; i < rm->nrows; i++) {
362			for (j = rm->ncols; j--; )
363	greg	2.27	setcolr(scan[j], rmx_lval(rm,i,j,0),
364	greg	2.1	rmx_lval(rm,i,j,1),
365			rmx_lval(rm,i,j,2) );
366	greg	2.27	if (fwritecolrs(scan, rm->ncols, fp) < 0) {
367	greg	2.1	free(scan);
368			return(0);
369			}
370			}
371			free(scan);
372			return(1);
373			}
374
375	greg	2.6	/* Write matrix to file type indicated by dtype */
376	greg	2.10	int
377	greg	2.1	rmx_write(const RMATRIX rm, int dtype, FILE fp)
378			{
379			RMATRIX *mydm = NULL;
380			int ok = 1;
381
382	greg	2.33	if (!rm \| !fp)
383	greg	2.1	return(0);
384	greg	2.17	#ifdef getc_unlocked
385			flockfile(fp);
386			#endif
387	greg	2.1	/* complete header */
388	greg	2.5	if (rm->info)
389			fputs(rm->info, fp);
390	greg	2.6	if (dtype == DTfromHeader)
391			dtype = rm->dtype;
392			else if ((dtype == DTrgbe) & (rm->dtype == DTxyze))
393			dtype = DTxyze;
394	greg	2.9	else if ((dtype == DTxyze) & (rm->dtype == DTrgbe))
395	greg	2.6	dtype = DTrgbe;
396	greg	2.1	if ((dtype != DTrgbe) & (dtype != DTxyze)) {
397			fprintf(fp, "NROWS=%d\n", rm->nrows);
398			fprintf(fp, "NCOLS=%d\n", rm->ncols);
399			fprintf(fp, "NCOMP=%d\n", rm->ncomp);
400			} else if (rm->ncomp != 3) { /* wrong # components? */
401			double cmtx[3];
402			if (rm->ncomp != 1) /* only convert grayscale */
403			return(0);
404			cmtx[0] = cmtx[1] = cmtx[2] = 1;
405			mydm = rmx_transform(rm, 3, cmtx);
406	greg	2.33	if (!mydm)
407	greg	2.1	return(0);
408			rm = mydm;
409			}
410	greg	2.35	if ((dtype == DTfloat) \| (dtype == DTdouble))
411			fputendian(fp); /* important to record */
412	greg	2.1	fputformat((char *)cm_fmt_id[dtype], fp);
413			fputc('\n', fp);
414			switch (dtype) { /* write data */
415			case DTascii:
416			ok = rmx_write_ascii(rm, fp);
417			break;
418			case DTfloat:
419			ok = rmx_write_float(rm, fp);
420			break;
421			case DTdouble:
422			ok = rmx_write_double(rm, fp);
423			break;
424			case DTrgbe:
425			case DTxyze:
426			fprtresolu(rm->ncols, rm->nrows, fp);
427			ok = rmx_write_rgbe(rm, fp);
428			break;
429			default:
430			return(0);
431			}
432			ok &= (fflush(fp) == 0);
433	greg	2.17	#ifdef getc_unlocked
434			funlockfile(fp);
435			#endif
436	greg	2.33	if (mydm)
437			rmx_free(mydm);
438	greg	2.10	return(ok);
439	greg	2.1	}
440
441			/* Allocate and assign square identity matrix with n components */
442			RMATRIX *
443			rmx_identity(const int dim, const int n)
444			{
445			RMATRIX *rid = rmx_alloc(dim, dim, n);
446	greg	2.12	int i, k;
447	greg	2.1
448	greg	2.33	if (!rid)
449	greg	2.1	return(NULL);
450	greg	2.12	memset(rid->mtx, 0, sizeof(rid->mtx[0])ndim*dim);
451	greg	2.1	for (i = dim; i--; )
452	greg	2.12	for (k = n; k--; )
453			rmx_lval(rid,i,i,k) = 1;
454	greg	2.1	return(rid);
455			}
456
457			/* Duplicate the given matrix */
458			RMATRIX *
459			rmx_copy(const RMATRIX *rm)
460			{
461			RMATRIX *dnew;
462
463	greg	2.33	if (!rm)
464	greg	2.1	return(NULL);
465			dnew = rmx_alloc(rm->nrows, rm->ncols, rm->ncomp);
466	greg	2.33	if (!dnew)
467	greg	2.1	return(NULL);
468	greg	2.5	rmx_addinfo(dnew, rm->info);
469	greg	2.6	dnew->dtype = rm->dtype;
470	greg	2.1	memcpy(dnew->mtx, rm->mtx,
471			sizeof(rm->mtx[0])rm->ncomprm->nrows*rm->ncols);
472			return(dnew);
473			}
474
475	greg	2.2	/* Allocate and assign transposed matrix */
476			RMATRIX *
477			rmx_transpose(const RMATRIX *rm)
478	greg	2.1	{
479	greg	2.2	RMATRIX *dnew;
480	greg	2.1	int i, j, k;
481
482	greg	2.33	if (!rm)
483	greg	2.1	return(0);
484	greg	2.31	if ((rm->nrows == 1) \| (rm->ncols == 1)) {
485			dnew = rmx_copy(rm);
486	greg	2.33	if (!dnew)
487	greg	2.32	return(NULL);
488	greg	2.31	dnew->nrows = rm->ncols;
489			dnew->ncols = rm->nrows;
490			return(dnew);
491			}
492	greg	2.2	dnew = rmx_alloc(rm->ncols, rm->nrows, rm->ncomp);
493	greg	2.33	if (!dnew)
494	greg	2.2	return(NULL);
495	greg	2.5	if (rm->info) {
496			rmx_addinfo(dnew, rm->info);
497			rmx_addinfo(dnew, "Transposed rows and columns\n");
498			}
499	greg	2.6	dnew->dtype = rm->dtype;
500	greg	2.2	for (i = dnew->nrows; i--; )
501			for (j = dnew->ncols; j--; )
502			for (k = dnew->ncomp; k--; )
503			rmx_lval(dnew,i,j,k) = rmx_lval(rm,j,i,k);
504			return(dnew);
505	greg	2.1	}
506
507			/* Multiply (concatenate) two matrices and allocate the result */
508			RMATRIX *
509			rmx_multiply(const RMATRIX m1, const RMATRIX m2)
510			{
511			RMATRIX *mres;
512			int i, j, k, h;
513
514	greg	2.33	if (!m1 \| !m2 \|\| (m1->ncomp != m2->ncomp) \| (m1->ncols != m2->nrows))
515	greg	2.1	return(NULL);
516			mres = rmx_alloc(m1->nrows, m2->ncols, m1->ncomp);
517	greg	2.33	if (!mres)
518	greg	2.1	return(NULL);
519	greg	2.6	i = rmx_newtype(m1->dtype, m2->dtype);
520			if (i)
521			mres->dtype = i;
522			else
523			rmx_addinfo(mres, rmx_mismatch_warn);
524	greg	2.1	for (i = mres->nrows; i--; )
525			for (j = mres->ncols; j--; )
526	greg	2.8	for (k = mres->ncomp; k--; ) {
527	greg	2.1	long double d = 0;
528	greg	2.8	for (h = m1->ncols; h--; )
529	greg	2.24	d += rmx_lval(m1,i,h,k) * rmx_lval(m2,h,j,k);
530	greg	2.1	rmx_lval(mres,i,j,k) = (double)d;
531			}
532			return(mres);
533			}
534
535	greg	2.25	/* Element-wise multiplication (or division) of m2 into m1 */
536			int
537			rmx_elemult(RMATRIX m1, const RMATRIX m2, int divide)
538			{
539			int zeroDivides = 0;
540			int i, j, k;
541
542	greg	2.33	if (!m1 \| !m2 \|\| (m1->ncols != m2->ncols) \| (m1->nrows != m2->nrows))
543	greg	2.25	return(0);
544			if ((m2->ncomp > 1) & (m2->ncomp != m1->ncomp))
545			return(0);
546			i = rmx_newtype(m1->dtype, m2->dtype);
547			if (i)
548			m1->dtype = i;
549			else
550			rmx_addinfo(m1, rmx_mismatch_warn);
551			for (i = m1->nrows; i--; )
552			for (j = m1->ncols; j--; )
553			if (divide) {
554			double d;
555			if (m2->ncomp == 1) {
556			d = rmx_lval(m2,i,j,0);
557			if (d == 0) {
558			++zeroDivides;
559			for (k = m1->ncomp; k--; )
560			rmx_lval(m1,i,j,k) = 0;
561			} else {
562			d = 1./d;
563			for (k = m1->ncomp; k--; )
564			rmx_lval(m1,i,j,k) *= d;
565			}
566			} else
567			for (k = m1->ncomp; k--; ) {
568			d = rmx_lval(m2,i,j,k);
569			if (d == 0) {
570			++zeroDivides;
571			rmx_lval(m1,i,j,k) = 0;
572			} else
573			rmx_lval(m1,i,j,k) /= d;
574			}
575			} else {
576			if (m2->ncomp == 1) {
577			const double d = rmx_lval(m2,i,j,0);
578			for (k = m1->ncomp; k--; )
579			rmx_lval(m1,i,j,k) *= d;
580			} else
581			for (k = m1->ncomp; k--; )
582			rmx_lval(m1,i,j,k) *= rmx_lval(m2,i,j,k);
583			}
584			if (zeroDivides) {
585	greg	2.34	rmx_addinfo(m1, "WARNING: zero divide(s) corrupted results\n");
586	greg	2.25	errno = ERANGE;
587			}
588			return(1);
589			}
590
591	greg	2.1	/* Sum second matrix into first, applying scale factor beforehand */
592			int
593			rmx_sum(RMATRIX msum, const RMATRIX madd, const double sf[])
594			{
595			double *mysf = NULL;
596			int i, j, k;
597
598	greg	2.33	if (!msum \| !madd \|\|
599	greg	2.1	(msum->nrows != madd->nrows) \|
600			(msum->ncols != madd->ncols) \|
601			(msum->ncomp != madd->ncomp))
602			return(0);
603	greg	2.33	if (!sf) {
604	greg	2.1	mysf = (double )malloc(sizeof(double)msum->ncomp);
605	greg	2.33	if (!mysf)
606	greg	2.1	return(0);
607			for (k = msum->ncomp; k--; )
608			mysf[k] = 1;
609			sf = mysf;
610			}
611	greg	2.6	i = rmx_newtype(msum->dtype, madd->dtype);
612			if (i)
613			msum->dtype = i;
614			else
615			rmx_addinfo(msum, rmx_mismatch_warn);
616	greg	2.1	for (i = msum->nrows; i--; )
617			for (j = msum->ncols; j--; )
618			for (k = msum->ncomp; k--; )
619			rmx_lval(msum,i,j,k) += sf[k] * rmx_lval(madd,i,j,k);
620	greg	2.33	if (mysf)
621			free(mysf);
622	greg	2.1	return(1);
623			}
624
625			/* Scale the given matrix by the indicated scalar component vector */
626			int
627			rmx_scale(RMATRIX *rm, const double sf[])
628			{
629			int i, j, k;
630
631	greg	2.33	if (!rm \| !sf)
632	greg	2.1	return(0);
633			for (i = rm->nrows; i--; )
634			for (j = rm->ncols; j--; )
635			for (k = rm->ncomp; k--; )
636			rmx_lval(rm,i,j,k) *= sf[k];
637
638	greg	2.28	if (rm->info)
639			rmx_addinfo(rm, "Applied scalar\n");
640	greg	2.1	return(1);
641			}
642
643			/* Allocate new matrix and apply component transformation */
644			RMATRIX *
645			rmx_transform(const RMATRIX *msrc, int n, const double cmat[])
646			{
647			int i, j, ks, kd;
648			RMATRIX *dnew;
649
650	greg	2.33	if (!msrc \| (n <= 0) \| !cmat)
651	greg	2.1	return(NULL);
652			dnew = rmx_alloc(msrc->nrows, msrc->ncols, n);
653	greg	2.33	if (!dnew)
654	greg	2.1	return(NULL);
655	greg	2.28	if (msrc->info) {
656			char buf[128];
657			sprintf(buf, "Applied %dx%d matrix transform\n",
658			dnew->ncomp, msrc->ncomp);
659			rmx_addinfo(dnew, msrc->info);
660			rmx_addinfo(dnew, buf);
661			}
662	greg	2.6	dnew->dtype = msrc->dtype;
663	greg	2.1	for (i = dnew->nrows; i--; )
664			for (j = dnew->ncols; j--; )
665			for (kd = dnew->ncomp; kd--; ) {
666			double d = 0;
667			for (ks = msrc->ncomp; ks--; )
668			d += cmat[kdmsrc->ncomp + ks] rmx_lval(msrc,i,j,ks);
669			rmx_lval(dnew,i,j,kd) = d;
670			}
671			return(dnew);
672			}
673
674			/* Convert a color matrix to newly allocated RMATRIX buffer */
675			RMATRIX *
676			rmx_from_cmatrix(const CMATRIX *cm)
677			{
678			int i, j;
679			RMATRIX *dnew;
680
681	greg	2.33	if (!cm)
682	greg	2.1	return(NULL);
683			dnew = rmx_alloc(cm->nrows, cm->ncols, 3);
684	greg	2.33	if (!dnew)
685	greg	2.1	return(NULL);
686	greg	2.6	dnew->dtype = DTfloat;
687	greg	2.1	for (i = dnew->nrows; i--; )
688			for (j = dnew->ncols; j--; ) {
689			const COLORV *cv = cm_lval(cm,i,j);
690			rmx_lval(dnew,i,j,0) = cv[0];
691			rmx_lval(dnew,i,j,1) = cv[1];
692			rmx_lval(dnew,i,j,2) = cv[2];
693			}
694			return(dnew);
695			}
696
697			/* Convert general matrix to newly allocated CMATRIX buffer */
698			CMATRIX *
699			cm_from_rmatrix(const RMATRIX *rm)
700			{
701			int i, j;
702			CMATRIX *cnew;
703
704	greg	2.33	if (!rm \|\| rm->ncomp != 3)
705	greg	2.1	return(NULL);
706			cnew = cm_alloc(rm->nrows, rm->ncols);
707	greg	2.33	if (!cnew)
708	greg	2.1	return(NULL);
709			for (i = cnew->nrows; i--; )
710			for (j = cnew->ncols; j--; ) {
711			COLORV *cv = cm_lval(cnew,i,j);
712			cv[0] = (COLORV)rmx_lval(rm,i,j,0);
713			cv[1] = (COLORV)rmx_lval(rm,i,j,1);
714			cv[2] = (COLORV)rmx_lval(rm,i,j,2);
715			}
716			return(cnew);
717			}