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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
| 3 |
#endif |
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/* |
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* data.c - routines dealing with interpolated data. |
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*/ |
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|
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/* ==================================================================== |
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* The Radiance Software License, Version 1.0 |
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* |
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* Copyright (c) 1990 - 2002 The Regents of the University of California, |
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* through Lawrence Berkeley National Laboratory. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, |
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* if any, must include the following acknowledgment: |
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* "This product includes Radiance software |
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* (http://radsite.lbl.gov/) |
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* developed by the Lawrence Berkeley National Laboratory |
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* (http://www.lbl.gov/)." |
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* Alternately, this acknowledgment may appear in the software itself, |
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* if and wherever such third-party acknowledgments normally appear. |
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* |
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* 4. The names "Radiance," "Lawrence Berkeley National Laboratory" |
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* and "The Regents of the University of California" must |
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* not be used to endorse or promote products derived from this |
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* software without prior written permission. For written |
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* permission, please contact [email protected]. |
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* |
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* 5. Products derived from this software may not be called "Radiance", |
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* nor may "Radiance" appear in their name, without prior written |
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* permission of Lawrence Berkeley National Laboratory. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of Lawrence Berkeley National Laboratory. For more |
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* information on Lawrence Berkeley National Laboratory, please see |
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* <http://www.lbl.gov/>. |
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*/ |
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|
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#include "standard.h" |
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|
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#include "color.h" |
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|
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#include "resolu.h" |
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|
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#include "data.h" |
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|
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/* picture memory usage before warning */ |
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#ifndef PSIZWARN |
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#ifdef BIGMEM |
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#define PSIZWARN 5000000 |
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#else |
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#define PSIZWARN 1500000 |
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#endif |
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#endif |
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|
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#ifndef TABSIZ |
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#define TABSIZ 97 /* table size (prime) */ |
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#endif |
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|
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#define hash(s) (shash(s)%TABSIZ) |
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|
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|
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static DATARRAY *dtab[TABSIZ]; /* data array list */ |
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|
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|
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DATARRAY * |
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getdata(dname) /* get data array dname */ |
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char *dname; |
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{ |
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char *dfname; |
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FILE *fp; |
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int asize; |
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register int i, j; |
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register DATARRAY *dp; |
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/* look for array in list */ |
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for (dp = dtab[hash(dname)]; dp != NULL; dp = dp->next) |
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if (!strcmp(dname, dp->name)) |
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return(dp); /* found! */ |
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/* |
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* If we haven't loaded the data already, we will look |
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* for it in the directories specified by the library path. |
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* |
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* The file has the following format: |
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* |
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* N |
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* beg0 end0 n0 |
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* beg1 end1 n1 |
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* . . . |
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* begN endN nN |
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* data, later dimensions changing faster |
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* . . . |
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* |
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* For irregularly spaced points, the following can be |
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* substituted for begi endi ni: |
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* |
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* 0 0 ni p0i p1i .. pni |
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*/ |
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|
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if ((dfname = getpath(dname, getlibpath(), R_OK)) == NULL) { |
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sprintf(errmsg, "cannot find data file \"%s\"", dname); |
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error(USER, errmsg); |
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} |
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if ((fp = fopen(dfname, "r")) == NULL) { |
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sprintf(errmsg, "cannot open data file \"%s\"", dfname); |
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error(SYSTEM, errmsg); |
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} |
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/* get dimensions */ |
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if (fgetval(fp, 'i', (char *)&asize) <= 0) |
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goto scanerr; |
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if (asize <= 0 | asize > MAXDDIM) { |
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sprintf(errmsg, "bad number of dimensions for \"%s\"", dname); |
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error(USER, errmsg); |
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} |
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if ((dp = (DATARRAY *)malloc(sizeof(DATARRAY))) == NULL) |
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goto memerr; |
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dp->name = savestr(dname); |
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dp->type = DATATY; |
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dp->nd = asize; |
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asize = 1; |
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for (i = 0; i < dp->nd; i++) { |
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if (fgetval(fp, DATATY, (char *)&dp->dim[i].org) <= 0) |
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goto scanerr; |
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if (fgetval(fp, DATATY, (char *)&dp->dim[i].siz) <= 0) |
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goto scanerr; |
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if (fgetval(fp, 'i', (char *)&dp->dim[i].ne) <= 0) |
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goto scanerr; |
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if (dp->dim[i].ne < 2) |
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goto scanerr; |
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asize *= dp->dim[i].ne; |
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if ((dp->dim[i].siz -= dp->dim[i].org) == 0) { |
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dp->dim[i].p = (DATATYPE *) |
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malloc(dp->dim[i].ne*sizeof(DATATYPE)); |
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if (dp->dim[i].p == NULL) |
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goto memerr; |
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for (j = 0; j < dp->dim[i].ne; j++) |
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if (fgetval(fp, DATATY, |
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(char *)&dp->dim[i].p[j]) <= 0) |
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goto scanerr; |
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for (j = 1; j < dp->dim[i].ne-1; j++) |
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if ((dp->dim[i].p[j-1] < dp->dim[i].p[j]) != |
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(dp->dim[i].p[j] < dp->dim[i].p[j+1])) |
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goto scanerr; |
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dp->dim[i].org = dp->dim[i].p[0]; |
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dp->dim[i].siz = dp->dim[i].p[dp->dim[i].ne-1] |
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- dp->dim[i].p[0]; |
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} else |
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dp->dim[i].p = NULL; |
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} |
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if ((dp->arr.d = (DATATYPE *)malloc(asize*sizeof(DATATYPE))) == NULL) |
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goto memerr; |
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|
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for (i = 0; i < asize; i++) |
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if (fgetval(fp, DATATY, (char *)&dp->arr.d[i]) <= 0) |
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goto scanerr; |
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fclose(fp); |
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i = hash(dname); |
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dp->next = dtab[i]; |
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return(dtab[i] = dp); |
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|
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memerr: |
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error(SYSTEM, "out of memory in getdata"); |
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scanerr: |
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sprintf(errmsg, "%s in data file \"%s\"", |
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feof(fp) ? "unexpected EOF" : "bad format", dfname); |
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error(USER, errmsg); |
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} |
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|
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|
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static int |
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headaspect(s, iap) /* check string for aspect ratio */ |
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char *s; |
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double *iap; |
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{ |
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char fmt[32]; |
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|
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if (isaspect(s)) |
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*iap *= aspectval(s); |
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else if (formatval(fmt, s) && !globmatch(PICFMT, fmt)) |
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*iap = 0.0; |
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return(0); |
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} |
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|
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|
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DATARRAY * |
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getpict(pname) /* get picture pname */ |
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char *pname; |
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{ |
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double inpaspect; |
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char *pfname; |
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FILE *fp; |
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COLR *scanin; |
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int sl, ns; |
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RESOLU inpres; |
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FLOAT loc[2]; |
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int y; |
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register int x, i; |
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register DATARRAY *pp; |
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/* look for array in list */ |
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for (pp = dtab[hash(pname)]; pp != NULL; pp = pp->next) |
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if (!strcmp(pname, pp->name)) |
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return(pp); /* found! */ |
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|
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if ((pfname = getpath(pname, getlibpath(), R_OK)) == NULL) { |
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sprintf(errmsg, "cannot find picture file \"%s\"", pname); |
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error(USER, errmsg); |
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} |
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if ((pp = (DATARRAY *)malloc(3*sizeof(DATARRAY))) == NULL) |
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goto memerr; |
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|
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pp[0].name = savestr(pname); |
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|
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if ((fp = fopen(pfname, "r")) == NULL) { |
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sprintf(errmsg, "cannot open picture file \"%s\"", pfname); |
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error(SYSTEM, errmsg); |
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} |
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#ifdef MSDOS |
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setmode(fileno(fp), O_BINARY); |
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#endif |
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/* get dimensions */ |
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inpaspect = 1.0; |
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getheader(fp, headaspect, (char *)&inpaspect); |
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if (inpaspect <= FTINY || !fgetsresolu(&inpres, fp)) |
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goto readerr; |
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pp[0].nd = 2; |
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pp[0].dim[0].ne = inpres.yr; |
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pp[0].dim[1].ne = inpres.xr; |
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pp[0].dim[0].org = |
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pp[0].dim[1].org = 0.0; |
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if (inpres.xr <= inpres.yr*inpaspect) { |
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pp[0].dim[0].siz = inpaspect * |
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(double)inpres.yr/inpres.xr; |
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pp[0].dim[1].siz = 1.0; |
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} else { |
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pp[0].dim[0].siz = 1.0; |
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pp[0].dim[1].siz = (double)inpres.xr/inpres.yr / |
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inpaspect; |
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} |
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pp[0].dim[0].p = pp[0].dim[1].p = NULL; |
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sl = scanlen(&inpres); /* allocate array */ |
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ns = numscans(&inpres); |
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i = ns*sl*sizeof(COLR); |
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#if PSIZWARN |
| 269 |
if (i > PSIZWARN) { /* memory warning */ |
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sprintf(errmsg, "picture file \"%s\" using %d bytes of memory", |
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pname, i); |
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error(WARNING, errmsg); |
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} |
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#endif |
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if ((pp[0].arr.c = (COLR *)malloc(i)) == NULL) |
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goto memerr; |
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/* load picture */ |
| 278 |
if ((scanin = (COLR *)malloc(sl*sizeof(COLR))) == NULL) |
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goto memerr; |
| 280 |
for (y = 0; y < ns; y++) { |
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if (freadcolrs(scanin, sl, fp) < 0) |
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goto readerr; |
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for (x = 0; x < sl; x++) { |
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pix2loc(loc, &inpres, x, y); |
| 285 |
i = (int)(loc[1]*inpres.yr)*inpres.xr + |
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(int)(loc[0]*inpres.xr); |
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copycolr(pp[0].arr.c[i], scanin[x]); |
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} |
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} |
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free((void *)scanin); |
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fclose(fp); |
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i = hash(pname); |
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pp[0].next = dtab[i]; /* link into picture list */ |
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copystruct(&pp[1], &pp[0]); |
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copystruct(&pp[2], &pp[0]); |
| 296 |
pp[0].type = RED; /* differentiate RGB records */ |
| 297 |
pp[1].type = GRN; |
| 298 |
pp[2].type = BLU; |
| 299 |
return(dtab[i] = pp); |
| 300 |
|
| 301 |
memerr: |
| 302 |
error(SYSTEM, "out of memory in getpict"); |
| 303 |
readerr: |
| 304 |
sprintf(errmsg, "bad picture file \"%s\"", pfname); |
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error(USER, errmsg); |
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} |
| 307 |
|
| 308 |
|
| 309 |
void |
| 310 |
freedata(dta) /* release data array reference */ |
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DATARRAY *dta; |
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{ |
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DATARRAY head; |
| 314 |
int hval, nents; |
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register DATARRAY *dpl, *dp; |
| 316 |
register int i; |
| 317 |
|
| 318 |
if (dta == NULL) { /* free all if NULL */ |
| 319 |
hval = 0; nents = TABSIZ; |
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} else { |
| 321 |
hval = hash(dta->name); nents = 1; |
| 322 |
} |
| 323 |
while (nents--) { |
| 324 |
head.next = dtab[hval]; |
| 325 |
dpl = &head; |
| 326 |
while ((dp = dpl->next) != NULL) |
| 327 |
if ((dta == NULL | dta == dp)) { |
| 328 |
dpl->next = dp->next; |
| 329 |
if (dp->type == DATATY) |
| 330 |
free((void *)dp->arr.d); |
| 331 |
else |
| 332 |
free((void *)dp->arr.c); |
| 333 |
for (i = 0; i < dp->nd; i++) |
| 334 |
if (dp->dim[i].p != NULL) |
| 335 |
free((void *)dp->dim[i].p); |
| 336 |
freestr(dp->name); |
| 337 |
free((void *)dp); |
| 338 |
} else |
| 339 |
dpl = dp; |
| 340 |
dtab[hval++] = head.next; |
| 341 |
} |
| 342 |
} |
| 343 |
|
| 344 |
|
| 345 |
double |
| 346 |
datavalue(dp, pt) /* interpolate data value at a point */ |
| 347 |
register DATARRAY *dp; |
| 348 |
double *pt; |
| 349 |
{ |
| 350 |
DATARRAY sd; |
| 351 |
int asize; |
| 352 |
int lower, upper; |
| 353 |
register int i; |
| 354 |
double x, y0, y1; |
| 355 |
/* set up dimensions for recursion */ |
| 356 |
if (dp->nd > 1) { |
| 357 |
sd.name = dp->name; |
| 358 |
sd.type = dp->type; |
| 359 |
sd.nd = dp->nd - 1; |
| 360 |
asize = 1; |
| 361 |
for (i = 0; i < sd.nd; i++) { |
| 362 |
sd.dim[i].org = dp->dim[i+1].org; |
| 363 |
sd.dim[i].siz = dp->dim[i+1].siz; |
| 364 |
sd.dim[i].p = dp->dim[i+1].p; |
| 365 |
asize *= sd.dim[i].ne = dp->dim[i+1].ne; |
| 366 |
} |
| 367 |
} |
| 368 |
/* get independent variable */ |
| 369 |
if (dp->dim[0].p == NULL) { /* evenly spaced points */ |
| 370 |
x = (pt[0] - dp->dim[0].org)/dp->dim[0].siz; |
| 371 |
x *= (double)(dp->dim[0].ne - 1); |
| 372 |
i = x; |
| 373 |
if (i < 0) |
| 374 |
i = 0; |
| 375 |
else if (i > dp->dim[0].ne - 2) |
| 376 |
i = dp->dim[0].ne - 2; |
| 377 |
} else { /* unevenly spaced points */ |
| 378 |
if (dp->dim[0].siz > 0.0) { |
| 379 |
lower = 0; |
| 380 |
upper = dp->dim[0].ne; |
| 381 |
} else { |
| 382 |
lower = dp->dim[0].ne; |
| 383 |
upper = 0; |
| 384 |
} |
| 385 |
do { |
| 386 |
i = (lower + upper) >> 1; |
| 387 |
if (pt[0] >= dp->dim[0].p[i]) |
| 388 |
lower = i; |
| 389 |
else |
| 390 |
upper = i; |
| 391 |
} while (i != (lower + upper) >> 1); |
| 392 |
if (i > dp->dim[0].ne - 2) |
| 393 |
i = dp->dim[0].ne - 2; |
| 394 |
x = i + (pt[0] - dp->dim[0].p[i]) / |
| 395 |
(dp->dim[0].p[i+1] - dp->dim[0].p[i]); |
| 396 |
} |
| 397 |
/* get dependent variable */ |
| 398 |
if (dp->nd > 1) { |
| 399 |
if (dp->type == DATATY) { |
| 400 |
sd.arr.d = dp->arr.d + i*asize; |
| 401 |
y0 = datavalue(&sd, pt+1); |
| 402 |
sd.arr.d = dp->arr.d + (i+1)*asize; |
| 403 |
y1 = datavalue(&sd, pt+1); |
| 404 |
} else { |
| 405 |
sd.arr.c = dp->arr.c + i*asize; |
| 406 |
y0 = datavalue(&sd, pt+1); |
| 407 |
sd.arr.c = dp->arr.c + (i+1)*asize; |
| 408 |
y1 = datavalue(&sd, pt+1); |
| 409 |
} |
| 410 |
} else { |
| 411 |
if (dp->type == DATATY) { |
| 412 |
y0 = dp->arr.d[i]; |
| 413 |
y1 = dp->arr.d[i+1]; |
| 414 |
} else { |
| 415 |
y0 = colrval(dp->arr.c[i],dp->type); |
| 416 |
y1 = colrval(dp->arr.c[i+1],dp->type); |
| 417 |
} |
| 418 |
} |
| 419 |
/* |
| 420 |
* Extrapolate as far as one division, then |
| 421 |
* taper off harmonically to zero. |
| 422 |
*/ |
| 423 |
if (x > i+2) |
| 424 |
return( (2*y1-y0)/(x-(i-1)) ); |
| 425 |
|
| 426 |
if (x < i-1) |
| 427 |
return( (2*y0-y1)/(i-x) ); |
| 428 |
|
| 429 |
return( y0*((i+1)-x) + y1*(x-i) ); |
| 430 |
} |
