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/* Copyright (c) 1997 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* 3D warping routines. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <math.h> |
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#include "fvect.h" |
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#include "warp3d.h" |
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#define MIND 1e-5 /* minimum distance between input points */ |
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typedef struct { |
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GNDX n; /* index must be first */ |
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W3VEC p; |
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W3VEC v; |
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} KEYDP; /* key/data allocation pair */ |
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#define fgetvec(f,v) (fgetval(f,'f',v) > 0 && fgetval(f,'f',v+1) > 0 \ |
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&& fgetval(f,'f',v+2) > 0) |
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#define fgetvec(p,v) (fgetval(p,'f',v) > 0 && fgetval(p,'f',v+1) > 0 \ |
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&& fgetval(p,'f',v+2) > 0) |
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#define AHUNK 32 /* number of points to allocate at a time */ |
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#define AHUNK 24 /* number of points to allocate at a time */ |
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#ifndef malloc |
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extern char *malloc(), *realloc(); |
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#endif |
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extern void free(); |
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double |
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wpdist2(p1, p2) /* compute square of distance between points */ |
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register W3VEC p1, p2; |
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{ |
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int rval = W3OK; |
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GNDX gi; |
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W3VEC gd; |
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W3VEC gd, ov; |
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|
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if (wp->grid.gn[0] == 0 && (rval = new3dwgrid(wp)) != W3OK) |
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if (wp->grid.gn[0] == 0 && (rval = new3dgrid(wp)) != W3OK) |
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return(rval); |
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rval |= gridpoint(gi, gd, pi, &wp->grid); |
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if (wp->grid.flags & W3EXACT) { |
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rval |= warp3dex(po, pi, wp); |
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return(rval); |
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} |
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if (wp->grid.flags & W3FAST) { |
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rval |= get3dgpt(po, gi, wp); |
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return(rval); |
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} |
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rval |= get3dgin(po, gi, gd, wp); |
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if (wp->grid.flags & W3EXACT) |
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rval |= warp3dex(ov, pi, wp); |
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else if (wp->grid.flags & W3FAST) |
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rval |= get3dgpt(ov, gi, wp); |
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else |
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rval |= get3dgin(ov, gi, gd, wp); |
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po[0] = pi[0] + ov[0]; |
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po[1] = pi[1] + ov[1]; |
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po[2] = pi[2] + ov[2]; |
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return(rval); |
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} |
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int |
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get3dgpt(po, ndx, wp) /* get value for voxel */ |
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W3VEC po; |
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get3dgpt(ov, ndx, wp) /* get value for voxel */ |
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W3VEC ov; |
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GNDX ndx; |
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register WARP3D *wp; |
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{ |
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int rval = W3OK; |
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register int i; |
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le = lu_find(&wp->grid.gtab, (char *)ndx); |
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le = lu_find(&wp->grid.gtab, ndx); |
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if (le == NULL) |
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return(W3ERROR); |
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if (le->data == NULL) { |
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if (wp->grid.flags & W3FAST) /* on centers */ |
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gpt[i] += .5*wp->grid.gstep[i]; |
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} |
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rval |= warp3dex(kd->p, gpt, wp); |
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rval = warp3dex(kd->v, gpt, wp); |
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le->key = (char *)kd->n; |
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le->data = (char *)kd->p; |
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le->data = (char *)kd->v; |
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} |
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W3VCPY(po, (float *)le->data); |
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W3VCPY(ov, (float *)le->data); |
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return(rval); |
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} |
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int |
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get3dgin(po, ndx, rem, wp) /* interpolate from warp grid */ |
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W3VEC po, rem; |
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get3dgin(ov, ndx, rem, wp) /* interpolate from warp grid */ |
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W3VEC ov, rem; |
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GNDX ndx; |
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WARP3D *wp; |
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{ |
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W3VEC cv[8]; |
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int rval; |
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GNDX gi; |
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int rval = W3OK; |
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register int i; |
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/* get corner values */ |
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for (i = 0; i < 8; i++) { |
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} |
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if (rval & W3ERROR) |
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return(rval); |
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l3interp(po, cv, rem, 3); /* perform trilinear interpolation */ |
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l3interp(ov, cv, rem, 3); /* perform trilinear interpolation */ |
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return(rval); |
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} |
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int |
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warp3dex(po, pi, wp) /* compute warp using 1/r^2 weighted avg. */ |
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W3VEC po, pi; |
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warp3dex(ov, pi, wp) /* compute warp using 1/r^2 weighted avg. */ |
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W3VEC ov, pi; |
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register WARP3D *wp; |
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{ |
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double d2, w, wsum; |
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W3VEC pt; |
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W3VEC vt; |
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register int i; |
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pt[0] = pt[1] = pt[2] = 0.; |
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vt[0] = vt[1] = vt[2] = 0.; |
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wsum = 0.; |
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for (i = wp->npts; i--; ) { |
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d2 = wpdist2(pi, wp->ip[i]); |
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if (d2 <= MIND*MIND) w = 1./(MIND*MIND); |
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else w = 1./d2; |
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pt[0] += w*wp->op[i][0]; |
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pt[1] += w*wp->op[i][1]; |
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pt[2] += w*wp->op[i][2]; |
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vt[0] += w*wp->ov[i][0]; |
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vt[1] += w*wp->ov[i][1]; |
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vt[2] += w*wp->ov[i][2]; |
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wsum += w; |
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} |
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if (wsum > 0.) { |
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po[0] = pt[0]/wsum; |
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po[1] = pt[1]/wsum; |
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po[2] = pt[2]/wsum; |
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ov[0] = vt[0]/wsum; |
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ov[1] = vt[1]/wsum; |
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ov[2] = vt[2]/wsum; |
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} |
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return(W3OK); |
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} |
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eputs("new3dw: no memory\n"); |
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return(NULL); |
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} |
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wp->ip = wp->op = NULL; |
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wp->ip = wp->ov = NULL; |
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wp->npts = 0; |
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wp->grid.flags = flgs; |
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wp->grid.gn[0] = wp->grid.gn[1] = wp->grid.gn[2] = 0; |
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eputs(": cannot open\n"); |
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return(NULL); |
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} |
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if (wp == NULL && (wp = new3dw()) == NULL) |
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if (wp == NULL && (wp = new3dw(0)) == NULL) |
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goto memerr; |
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while (fgetvec(fp, inp) && fgetvec(fp, outp)) |
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if (!add3dpt(wp, inp, outp)) |
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int |
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set3dwfl(wp, flgs) /* reset warp flags */ |
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register WARP3D *wp; |
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int flgs; |
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{ |
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if (flgs == wp->grid.flags) |
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return(0); |
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if ((flgs & (W3EXACT|W3FAST)) == (W3EXACT|W3FAST)) { |
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eputs("set3dwfl: only one of W3EXACT or W3FAST\n"); |
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return(-1); |
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} |
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wp->grid.flags = flgs; |
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done3dgrid(&wp->grid); /* old grid is invalid */ |
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return(0); |
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} |
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int |
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add3dpt(wp, pti, pto) /* add 3D point pair to warp structure */ |
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register WARP3D *wp; |
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W3VEC pti, pto; |
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if (wp->npts == 0) { /* initialize */ |
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wp->ip = (W3VEC *)malloc(AHUNK*sizeof(W3VEC)); |
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if (wp->ip == NULL) return(0); |
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wp->op = (W3VEC *)malloc(AHUNK*sizeof(W3VEC)); |
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if (wp->op == NULL) return(0); |
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wp->ov = (W3VEC *)malloc(AHUNK*sizeof(W3VEC)); |
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if (wp->ov == NULL) return(0); |
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wp->d2min = 1e10; |
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wp->d2max = 0.; |
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W3VCPY(wp->llim, pti); |
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(wp->npts+AHUNK)*sizeof(W3VEC)); |
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if (na == NULL) return(0); |
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wp->ip = na; |
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na = (W3VEC *)realloc((char *)wp->op, |
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na = (W3VEC *)realloc((char *)wp->ov, |
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(wp->npts+AHUNK)*sizeof(W3VEC)); |
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if (na == NULL) return(0); |
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wp->op = na; |
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wp->ov = na; |
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} |
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for (i = 0; i < 3; i++) /* check boundaries */ |
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if (pti[i] < wp->llim[i]) |
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} |
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} |
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W3VCPY(wp->ip[wp->npts], pti); /* add new point */ |
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W3VCPY(wp->op[wp->npts], pto); |
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wp->ov[wp->npts][0] = pto[0] - pti[0]; |
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wp->ov[wp->npts][1] = pto[1] - pti[1]; |
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wp->ov[wp->npts][2] = pto[2] - pti[2]; |
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done3dgrid(&wp->grid); /* old grid is invalid */ |
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return(++wp->npts); |
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} |
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register WARP3D *wp; |
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{ |
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done3dgrid(&wp->grid); |
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free((char *)wp->ip); |
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free((char *)wp->op); |
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free((char *)wp); |
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free((void *)wp->ip); |
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free((void *)wp->ov); |
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free((void *)wp); |
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} |
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long |
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unsigned long |
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gridhash(gp) /* hash a grid point index */ |
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GNDX gp; |
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{ |
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int |
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new3dwgrid(wp) /* initialize interpolating grid for warp */ |
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new3dgrid(wp) /* initialize interpolating grid for warp */ |
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register WARP3D *wp; |
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{ |
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W3VEC gmax; |
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double gridstep, d; |
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int n; |
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register int i; |
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/* free old grid (if any) */ |
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done3dgrid(&wp->grid); |
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return(W3BADMAP); /* not enough disparity */ |
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/* compute gamut */ |
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W3VCPY(wp->grid.gmin, wp->llim); |
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W3VCPY(wp->grid.gmax, wp->ulim); |
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W3VCPY(gmax, wp->ulim); |
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gridstep = sqrt(wp->d2min); |
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for (i = 0; i < 3; i++) { |
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wp->grid.gmin[i] -= .501*gridstep; |
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wp->grid.gmax[i] += .501*gridstep; |
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gmax[i] += .501*gridstep; |
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} |
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if (wp->grid.flags & W3EXACT) { |
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wp->grid.gn[0] = wp->grid.gn[1] = wp->grid.gn[2] = 1; |
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wp->grid.gstep[0] = gmax[0] - wp->grid.gmin[0]; |
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wp->grid.gstep[1] = gmax[1] - wp->grid.gmin[1]; |
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wp->grid.gstep[2] = gmax[2] - wp->grid.gmin[2]; |
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return(W3OK); /* no interpolation, so no grid */ |
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} |
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/* create grid */ |
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for (i = 0; i < 3; i++) { |
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d = wp->grid.gmax[i] - wp->grid.gmin[i]; |
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wp->grid.gn[i] = d/gridstep + .5; |
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if (wp->grid.gn[i] >= MAXGN) |
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wp->grid.gn[i] = MAXGN-1; |
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wp->grid.gstep[i] = d / wp->grid.gn[i]; |
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d = gmax[i] - wp->grid.gmin[i]; |
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n = d/gridstep + .5; |
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if (n >= MAXGN-1) |
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n = MAXGN-2; |
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wp->grid.gstep[i] = d / n; |
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wp->grid.gn[i] = n; |
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} |
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/* initialize lookup table */ |
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wp->grid.gtab.hashf = gridhash; |