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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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|
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/* |
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* Quadtree driver support routines. |
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*/ |
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|
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#include "standard.h" |
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#include "rhd_qtree.h" |
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|
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static RLEAF *leafpile; /* our collection of leaf values */ |
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static int nleaves; /* count of leaves in our pile */ |
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static int bleaf, tleaf; /* bottom and top (next) leaf index (ring) */ |
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|
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RTREE qtrunk; /* our quadtree trunk */ |
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double qtDepthEps = .02; /* epsilon to compare depths (z fraction) */ |
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int qtMinNodesiz = 2; /* minimum node dimension (pixels) */ |
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|
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#define TBUNDLESIZ 409 /* number of twigs in a bundle */ |
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|
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static RTREE **twigbundle; /* free twig blocks (NULL term.) */ |
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static int nexttwig; /* next free twig */ |
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|
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static RTREE emptytree; /* empty tree for test below */ |
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|
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#define is_stump(t) (!bcmp((char *)(t), (char *)&emptytree, sizeof(RTREE))) |
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|
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|
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static RTREE * |
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newtwig() /* allocate a twig */ |
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{ |
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register int bi; |
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|
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if (twigbundle == NULL) { /* initialize */ |
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twigbundle = (RTREE **)malloc(sizeof(RTREE *)); |
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if (twigbundle == NULL) |
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goto memerr; |
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twigbundle[0] = NULL; |
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} |
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bi = nexttwig / TBUNDLESIZ; |
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if (twigbundle[bi] == NULL) { /* new block */ |
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twigbundle = (RTREE **)realloc((char *)twigbundle, |
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(bi+2)*sizeof(RTREE *)); |
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if (twigbundle == NULL) |
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goto memerr; |
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twigbundle[bi] = (RTREE *)calloc(TBUNDLESIZ, sizeof(RTREE)); |
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if (twigbundle[bi] == NULL) |
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goto memerr; |
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twigbundle[bi+1] = NULL; |
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} |
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/* nexttwig++ % TBUNDLESIZ */ |
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return(twigbundle[bi] + (nexttwig++ - bi*TBUNDLESIZ)); |
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memerr: |
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error(SYSTEM, "out of memory in newtwig"); |
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} |
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|
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|
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static |
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freetwigs(really) /* free allocated twigs */ |
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int really; |
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{ |
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register int i; |
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|
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if (tmTop != NULL) |
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tmClearHisto(); |
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bzero((char *)&qtrunk, sizeof(RTREE)); |
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nexttwig = 0; |
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if (twigbundle == NULL) |
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return; |
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if (!really) { /* just clear allocated blocks */ |
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for (i = 0; twigbundle[i] != NULL; i++) |
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bzero((char *)twigbundle[i], TBUNDLESIZ*sizeof(RTREE)); |
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return; |
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} |
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/* else "really" means free up memory */ |
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for (i = 0; twigbundle[i] != NULL; i++) |
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free((char *)twigbundle[i]); |
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free((char *)twigbundle); |
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twigbundle = NULL; |
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} |
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|
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|
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static RLEAF * |
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newleaf() /* allocate a leaf from our pile */ |
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{ |
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if (tleaf++ >= nleaves) /* get next leaf in ring */ |
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tleaf = 0; |
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if (tleaf == bleaf) /* need to shake some free */ |
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qtCompost(LFREEPCT); |
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return(leafpile + tleaf); |
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} |
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|
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|
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int |
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qtAllocLeaves(n) /* allocate space for n leaves */ |
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int n; |
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{ |
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unsigned nbytes; |
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register unsigned i; |
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|
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freetwigs(0); /* make sure tree is empty */ |
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if (n <= 0) |
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return(0); |
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if (nleaves >= n) |
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return(nleaves); |
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else if (nleaves > 0) |
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free((char *)leafpile); |
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/* round space up to nearest power of 2 */ |
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nbytes = n*sizeof(RLEAF) + 8; |
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for (i = 1024; nbytes > i; i <<= 1) |
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; |
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n = (i - 8) / sizeof(RLEAF); |
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leafpile = (RLEAF *)malloc(n*sizeof(RLEAF)); |
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if (leafpile == NULL) |
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return(-1); |
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nleaves = n; |
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bleaf = tleaf = 0; |
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return(nleaves); |
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} |
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|
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|
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qtFreeLeaves() /* free our allocated leaves and twigs */ |
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{ |
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freetwigs(1); /* free tree also */ |
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if (nleaves <= 0) |
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return; |
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free((char *)leafpile); |
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leafpile = NULL; |
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nleaves = 0; |
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} |
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|
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|
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static |
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shaketree(tp) /* shake dead leaves from tree */ |
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register RTREE *tp; |
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{ |
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register int i, li; |
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|
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for (i = 0; i < 4; i++) |
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if (tp->flgs & BRF(i)) { |
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if (shaketree(tp->k[i].b)) |
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tp->flgs |= CHF(i); |
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} else if (tp->k[i].l != NULL) { |
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li = tp->k[i].l - leafpile; |
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if (bleaf < tleaf ? (li < bleaf || li >= tleaf) : |
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(li < bleaf && li >= tleaf)) { |
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tmAddHisto(&tp->k[i].l->brt, 1, -1); |
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tp->k[i].l = NULL; |
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tp->flgs |= CHF(i); |
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} |
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} |
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return(tp->flgs & CH_ANY); |
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} |
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|
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|
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int |
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qtCompost(pct) /* free up some leaves */ |
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int pct; |
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{ |
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int nused, nclear; |
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/* figure out how many leaves to clear */ |
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nclear = nleaves * pct / 100; |
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if (nclear <= 0) |
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return(0); |
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nused = tleaf > bleaf ? tleaf-bleaf : tleaf+nleaves-bleaf; |
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if (nclear >= nused) { /* clear them all */ |
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freetwigs(0); |
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bleaf = tleaf = 0; |
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return(nused); |
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} |
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/* else clear leaves from bottom */ |
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bleaf = (bleaf + nclear) % nleaves; |
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shaketree(&qtrunk); |
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return(nclear); |
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} |
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|
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|
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static |
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addleaf(lp) /* add a leaf to our tree */ |
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RLEAF *lp; |
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{ |
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register RTREE *tp = &qtrunk; |
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int x0=0, y0=0, x1=odev.hres, y1=odev.vres; |
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RLEAF *lo = NULL; |
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int x, y, mx, my; |
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double z; |
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FVECT ip, wp; |
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register int q; |
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/* compute leaf location */ |
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VCOPY(wp, lp->wp); |
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viewloc(ip, &odev.v, wp); |
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if (ip[2] <= 0. || ip[0] < 0. || ip[0] >= 1. |
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|| ip[1] < 0. || ip[1] >= 1.) |
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return; |
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x = ip[0] * odev.hres; |
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y = ip[1] * odev.vres; |
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z = ip[2]; |
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/* find the place for it */ |
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for ( ; ; ) { |
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q = 0; /* which quadrant? */ |
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mx = (x0 + x1) >> 1; |
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my = (y0 + y1) >> 1; |
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if (x < mx) x1 = mx; |
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else {x0 = mx; q |= 01;} |
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if (y < my) y1 = my; |
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else {y0 = my; q |= 02;} |
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if (tp->flgs & BRF(q)) { /* move to next branch */ |
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tp->flgs |= CHF(q); /* not sure; guess */ |
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tp = tp->k[q].b; |
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continue; |
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} |
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if (tp->k[q].l == NULL) { /* found stem for leaf */ |
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tp->k[q].l = lp; |
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tp->flgs |= CHF(q); |
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break; |
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} |
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/* check existing leaf */ |
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if (lo != tp->k[q].l) { |
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lo = tp->k[q].l; |
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VCOPY(wp, lo->wp); |
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viewloc(ip, &odev.v, wp); |
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} |
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/* is node minimum size? */ |
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if (x1-x0 <= qtMinNodesiz || y1-y0 <= qtMinNodesiz) { |
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if (z > (1.-qtDepthEps)*ip[2]) /* who is closer? */ |
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return; /* old one is */ |
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tp->k[q].l = lp; /* new one is */ |
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tp->flgs |= CHF(q); |
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tmAddHisto(&lo->brt, 1, -1); /* drop old one */ |
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break; |
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} |
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tp->flgs |= CHBRF(q); /* else grow tree */ |
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tp = tp->k[q].b = newtwig(); |
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tp->flgs |= CH_ANY; /* all new */ |
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q = 0; /* old leaf -> new branch */ |
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mx = ip[0] * odev.hres; |
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my = ip[1] * odev.vres; |
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if (mx >= (x0 + x1) >> 1) q |= 01; |
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if (my >= (y0 + y1) >> 1) q |= 02; |
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tp->k[q].l = lo; |
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} |
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tmAddHisto(&lp->brt, 1, 1); /* add leaf to histogram */ |
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} |
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|
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|
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dev_value(c, p) /* add a pixel value to our output queue */ |
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COLR c; |
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FVECT p; |
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{ |
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register RLEAF *lp; |
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|
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lp = newleaf(); |
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VCOPY(lp->wp, p); |
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tmCvColrs(&lp->brt, lp->chr, c, 1); |
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addleaf(lp); |
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} |
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|
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|
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qtReplant() /* replant our tree using new view */ |
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{ |
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register int i; |
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|
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if (bleaf == tleaf) /* anything to replant? */ |
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return; |
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freetwigs(0); /* blow the tree away */ |
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/* now rebuild it */ |
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for (i = bleaf; i != tleaf; ) { |
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addleaf(leafpile+i); |
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if (++i >= nleaves) i = 0; |
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} |
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tmComputeMapping(0., 0., 0.); /* update the display */ |
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qtUpdate(); |
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} |
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|
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|
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static |
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redraw(ca, tp, x0, y0, x1, y1, l) /* redraw portion of a tree */ |
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BYTE ca[3]; /* returned average color */ |
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register RTREE *tp; |
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int x0, y0, x1, y1; |
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int l[2][2]; |
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{ |
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int csm[3], nc; |
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BYTE rgb[3]; |
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int quads = CH_ANY; |
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int mx, my; |
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register int i; |
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/* compute midpoint */ |
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mx = (x0 + x1) >> 1; |
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my = (y0 + y1) >> 1; |
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/* see what to do */ |
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if (l[0][0] >= mx) |
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quads &= ~(CHF(2)|CHF(0)); |
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else if (l[0][1] <= mx) |
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quads &= ~(CHF(3)|CHF(1)); |
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if (l[1][0] >= my) |
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quads &= ~(CHF(1)|CHF(0)); |
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else if (l[1][1] <= my) |
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quads &= ~(CHF(3)|CHF(2)); |
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tp->flgs &= ~quads; /* mark them done */ |
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csm[0] = csm[1] = csm[2] = nc = 0; |
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/* do leaves first */ |
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for (i = 0; i < 4; i++) |
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if (quads & CHF(i) && !(tp->flgs & BRF(i)) && |
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tp->k[i].l != NULL) { |
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tmMapPixels(rgb, &tp->k[i].l->brt, tp->k[i].l->chr, 1); |
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dev_paintr(rgb, i&01 ? mx : x0, i&02 ? my : y0, |
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i&01 ? x1 : mx, i&02 ? y1 : my); |
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csm[0] += rgb[0]; csm[1] += rgb[1]; csm[2] += rgb[2]; |
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nc++; |
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quads &= ~CHF(i); |
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} |
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/* now do branches */ |
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for (i = 0; i < 4; i++) |
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if (quads & CHF(i) && tp->flgs & BRF(i)) { |
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redraw(rgb, tp->k[i].b, i&01 ? mx : x0, i&02 ? my : y0, |
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i&01 ? x1 : mx, i&02 ? y1 : my, l); |
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csm[0] += rgb[0]; csm[1] += rgb[1]; csm[2] += rgb[2]; |
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nc++; |
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quads &= ~CHF(i); |
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} |
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if (nc > 1) { |
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ca[0] = csm[0]/nc; ca[1] = csm[1]/nc; ca[2] = csm[2]/nc; |
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} else { |
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ca[0] = csm[0]; ca[1] = csm[1]; ca[2] = csm[2]; |
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} |
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if (!quads) return; |
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/* fill in gaps with average */ |
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for (i = 0; i < 4; i++) |
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if (quads & CHF(i)) |
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dev_paintr(ca, i&01 ? mx : x0, i&02 ? my : y0, |
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i&01 ? x1 : mx, i&02 ? y1 : my); |
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} |
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|
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|
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static |
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update(ca, tp, x0, y0, x1, y1) /* update tree display as needed */ |
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BYTE ca[3]; /* returned average color */ |
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register RTREE *tp; |
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int x0, y0, x1, y1; |
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{ |
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int csm[3], nc; |
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BYTE rgb[3]; |
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int gaps = 0; |
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int mx, my; |
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register int i; |
| 350 |
/* compute midpoint */ |
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mx = (x0 + x1) >> 1; |
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my = (y0 + y1) >> 1; |
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csm[0] = csm[1] = csm[2] = nc = 0; |
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/* do leaves first */ |
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for (i = 0; i < 4; i++) |
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if ((tp->flgs & CHBRF(i)) == CHF(i)) { |
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if (tp->k[i].l == NULL) { |
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gaps |= 1<<i; /* empty stem */ |
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continue; |
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} |
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tmMapPixels(rgb, &tp->k[i].l->brt, tp->k[i].l->chr, 1); |
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dev_paintr(rgb, i&01 ? mx : x0, i&02 ? my : y0, |
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i&01 ? x1 : mx, i&02 ? y1 : my); |
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csm[0] += rgb[0]; csm[1] += rgb[1]; csm[2] += rgb[2]; |
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nc++; |
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} |
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/* now do branches */ |
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for (i = 0; i < 4; i++) |
| 369 |
if ((tp->flgs & CHBRF(i)) == CHBRF(i)) { |
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update(rgb, tp->k[i].b, i&01 ? mx : x0, i&02 ? my : y0, |
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i&01 ? x1 : mx, i&02 ? y1 : my); |
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csm[0] += rgb[0]; csm[1] += rgb[1]; csm[2] += rgb[2]; |
| 373 |
nc++; |
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} |
| 375 |
if (nc > 1) { |
| 376 |
ca[0] = csm[0]/nc; ca[1] = csm[1]/nc; ca[2] = csm[2]/nc; |
| 377 |
} else { |
| 378 |
ca[0] = csm[0]; ca[1] = csm[1]; ca[2] = csm[2]; |
| 379 |
} |
| 380 |
/* fill in gaps with average */ |
| 381 |
for (i = 0; gaps && i < 4; gaps >>= 1, i++) |
| 382 |
if (gaps & 01) |
| 383 |
dev_paintr(ca, i&01 ? mx : x0, i&02 ? my : y0, |
| 384 |
i&01 ? x1 : mx, i&02 ? y1 : my); |
| 385 |
tp->flgs &= ~CH_ANY; /* all done */ |
| 386 |
} |
| 387 |
|
| 388 |
|
| 389 |
qtRedraw(x0, y0, x1, y1) /* redraw part of our screen */ |
| 390 |
int x0, y0, x1, y1; |
| 391 |
{ |
| 392 |
int lim[2][2]; |
| 393 |
BYTE ca[3]; |
| 394 |
|
| 395 |
if (is_stump(&qtrunk)) |
| 396 |
return; |
| 397 |
if ((lim[0][0]=x0) == 0 & (lim[1][0]=y0) == 0 & |
| 398 |
(lim[0][1]=x1) == odev.hres & (lim[1][1]=y1) == odev.vres || |
| 399 |
tmTop->lumap == NULL) |
| 400 |
tmComputeMapping(0., 0., 0.); |
| 401 |
redraw(ca, &qtrunk, 0, 0, odev.hres, odev.vres, lim); |
| 402 |
} |
| 403 |
|
| 404 |
|
| 405 |
qtUpdate() /* update our tree display */ |
| 406 |
{ |
| 407 |
BYTE ca[3]; |
| 408 |
|
| 409 |
if (is_stump(&qtrunk)) |
| 410 |
return; |
| 411 |
if (tmTop->lumap == NULL) |
| 412 |
tmComputeMapping(0., 0., 0.); |
| 413 |
update(ca, &qtrunk, 0, 0, odev.hres, odev.vres); |
| 414 |
} |
