| 1 |
/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ SGI"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Quadtree driver support routines. |
| 9 |
*/ |
| 10 |
|
| 11 |
#include "standard.h" |
| 12 |
#include "rhd_qtree.h" |
| 13 |
|
| 14 |
RTREE qtrunk; /* our quadtree trunk */ |
| 15 |
double qtDepthEps = .02; /* epsilon to compare depths (z fraction) */ |
| 16 |
int qtMinNodesiz = 2; /* minimum node dimension (pixels) */ |
| 17 |
struct rleaves qtL; /* our pile of leaves */ |
| 18 |
|
| 19 |
#define TBUNDLESIZ 409 /* number of twigs in a bundle */ |
| 20 |
|
| 21 |
static RTREE **twigbundle; /* free twig blocks (NULL term.) */ |
| 22 |
static int nexttwig; /* next free twig */ |
| 23 |
|
| 24 |
#define is_stump(t) (!((t)->flgs & (BR_ANY|LF_ANY))) |
| 25 |
|
| 26 |
|
| 27 |
static RTREE * |
| 28 |
newtwig() /* allocate a twig */ |
| 29 |
{ |
| 30 |
register int bi; |
| 31 |
|
| 32 |
if (twigbundle == NULL) { /* initialize */ |
| 33 |
twigbundle = (RTREE **)malloc(sizeof(RTREE *)); |
| 34 |
if (twigbundle == NULL) |
| 35 |
goto memerr; |
| 36 |
twigbundle[0] = NULL; |
| 37 |
} |
| 38 |
bi = nexttwig / TBUNDLESIZ; |
| 39 |
if (twigbundle[bi] == NULL) { /* new block */ |
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twigbundle = (RTREE **)realloc((char *)twigbundle, |
| 41 |
(bi+2)*sizeof(RTREE *)); |
| 42 |
if (twigbundle == NULL) |
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goto memerr; |
| 44 |
twigbundle[bi] = (RTREE *)calloc(TBUNDLESIZ, sizeof(RTREE)); |
| 45 |
if (twigbundle[bi] == NULL) |
| 46 |
goto memerr; |
| 47 |
twigbundle[bi+1] = NULL; |
| 48 |
} |
| 49 |
/* nexttwig++ % TBUNDLESIZ */ |
| 50 |
return(twigbundle[bi] + (nexttwig++ - bi*TBUNDLESIZ)); |
| 51 |
memerr: |
| 52 |
error(SYSTEM, "out of memory in newtwig"); |
| 53 |
} |
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|
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|
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qtFreeTree(really) /* free allocated twigs */ |
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int really; |
| 58 |
{ |
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register int i; |
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|
| 61 |
qtrunk.flgs = 0; |
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nexttwig = 0; |
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if (twigbundle == NULL) |
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return; |
| 65 |
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; |
| 69 |
} |
| 70 |
/* else "really" means free up memory */ |
| 71 |
for (i = 0; twigbundle[i] != NULL; i++) |
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free((char *)twigbundle[i]); |
| 73 |
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 int |
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newleaf() /* allocate a leaf from our pile */ |
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{ |
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int li; |
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|
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li = qtL.tl++; |
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if (qtL.tl >= qtL.nl) /* get next leaf in ring */ |
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qtL.tl = 0; |
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if (qtL.tl == qtL.bl) /* need to shake some free */ |
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qtCompost(LFREEPCT); |
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return(li); |
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} |
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|
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|
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#define LEAFSIZ (3*sizeof(float)+sizeof(TMbright)+6*sizeof(BYTE)) |
| 93 |
|
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int |
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qtAllocLeaves(n) /* allocate space for n leaves */ |
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register int n; |
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{ |
| 98 |
unsigned nbytes; |
| 99 |
register unsigned i; |
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|
| 101 |
qtFreeTree(0); /* make sure tree is empty */ |
| 102 |
if (n <= 0) |
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return(0); |
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if (qtL.nl >= n) |
| 105 |
return(qtL.nl); |
| 106 |
else if (qtL.nl > 0) |
| 107 |
free(qtL.base); |
| 108 |
/* round space up to nearest power of 2 */ |
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nbytes = n*LEAFSIZ + 8; |
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for (i = 1024; nbytes > i; i <<= 1) |
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; |
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n = (i - 8) / LEAFSIZ; /* should we make sure n is even? */ |
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qtL.base = (char *)malloc(n*LEAFSIZ); |
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if (qtL.base == NULL) |
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return(0); |
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/* assign larger alignment types earlier */ |
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qtL.wp = (float (*)[3])qtL.base; |
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qtL.brt = (TMbright *)(qtL.wp + n); |
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qtL.chr = (BYTE (*)[3])(qtL.brt + n); |
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qtL.rgb = (BYTE (*)[3])(qtL.chr + n); |
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qtL.nl = n; |
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qtL.tml = qtL.bl = qtL.tl = 0; |
| 123 |
return(n); |
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} |
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|
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#undef LEAFSIZ |
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|
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|
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qtFreeLeaves() /* free our allocated leaves and twigs */ |
| 130 |
{ |
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qtFreeTree(1); /* free tree also */ |
| 132 |
if (qtL.nl <= 0) |
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return; |
| 134 |
free(qtL.base); |
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qtL.base = NULL; |
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qtL.nl = 0; |
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} |
| 138 |
|
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|
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static |
| 141 |
shaketree(tp) /* shake dead leaves from tree */ |
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register RTREE *tp; |
| 143 |
{ |
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register int i, li; |
| 145 |
|
| 146 |
for (i = 0; i < 4; i++) |
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if (tp->flgs & BRF(i)) { |
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shaketree(tp->k[i].b); |
| 149 |
if (is_stump(tp->k[i].b)) |
| 150 |
tp->flgs &= ~BRF(i); |
| 151 |
} else if (tp->flgs & LFF(i)) { |
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li = tp->k[i].li; |
| 153 |
if (qtL.bl < qtL.tl ? |
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(li < qtL.bl || li >= qtL.tl) : |
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(li < qtL.bl && li >= qtL.tl)) |
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tp->flgs &= ~LFF(i); |
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} |
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} |
| 159 |
|
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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, nmapped; |
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|
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/* figure out how many leaves to clear */ |
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nclear = qtL.nl * pct / 100; |
| 169 |
nused = qtL.tl - qtL.bl; |
| 170 |
if (nused <= 0) nused += qtL.nl; |
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nclear -= qtL.nl - nused; |
| 172 |
if (nclear <= 0) |
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return(0); |
| 174 |
if (nclear >= nused) { /* clear them all */ |
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qtFreeTree(0); |
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qtL.tml = qtL.bl = qtL.tl = 0; |
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return(nused); |
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} |
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/* else clear leaves from bottom */ |
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nmapped = qtL.tml - qtL.bl; |
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if (nmapped < 0) nmapped += qtL.nl; |
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qtL.bl += nclear; |
| 183 |
if (qtL.bl >= qtL.nl) qtL.bl -= qtL.nl; |
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if (nmapped <= nclear) qtL.tml = qtL.bl; |
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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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int |
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qtFindLeaf(x, y) /* find closest leaf to (x,y) */ |
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int x, y; |
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{ |
| 194 |
register RTREE *tp = &qtrunk; |
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int li = -1; |
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int x0=0, y0=0, x1=odev.hres, y1=odev.vres; |
| 197 |
int mx, my; |
| 198 |
register int q; |
| 199 |
/* check limits */ |
| 200 |
if (x < 0 || x >= odev.hres || y < 0 || y >= odev.vres) |
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return(-1); |
| 202 |
/* find nearby leaf in our tree */ |
| 203 |
for ( ; ; ) { |
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for (q = 0; q < 4; q++) /* find any leaf this level */ |
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if (tp->flgs & LFF(q)) { |
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li = tp->k[q].li; |
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break; |
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} |
| 209 |
q = 0; /* which quadrant are we? */ |
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mx = (x0 + x1) >> 1; |
| 211 |
my = (y0 + y1) >> 1; |
| 212 |
if (x < mx) x1 = mx; |
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else {x0 = mx; q |= 01;} |
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if (y < my) y1 = my; |
| 215 |
else {y0 = my; q |= 02;} |
| 216 |
if (tp->flgs & BRF(q)) { /* branch down if not a leaf */ |
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tp = tp->k[q].b; |
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continue; |
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} |
| 220 |
if (tp->flgs & LFF(q)) /* good shot! */ |
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return(tp->k[q].li); |
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return(li); /* else return what we have */ |
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} |
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} |
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|
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|
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static |
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addleaf(li) /* add a leaf to our tree */ |
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int li; |
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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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int lo = -1; |
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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, qtL.wp[li]); |
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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; |
| 255 |
else {y0 = my; q |= 02;} |
| 256 |
if (tp->flgs & BRF(q)) { /* move to next branch */ |
| 257 |
tp->flgs |= CHF(q); /* not sure; guess */ |
| 258 |
tp = tp->k[q].b; |
| 259 |
continue; |
| 260 |
} |
| 261 |
if (!(tp->flgs & LFF(q))) { /* found stem for leaf */ |
| 262 |
tp->k[q].li = li; |
| 263 |
tp->flgs |= CHLFF(q); |
| 264 |
break; |
| 265 |
} |
| 266 |
/* check existing leaf */ |
| 267 |
if (lo != tp->k[q].li) { |
| 268 |
lo = tp->k[q].li; |
| 269 |
VCOPY(wp, qtL.wp[lo]); |
| 270 |
viewloc(ip, &odev.v, wp); |
| 271 |
} |
| 272 |
/* is node minimum size? */ |
| 273 |
if (x1-x0 <= qtMinNodesiz || y1-y0 <= qtMinNodesiz) { |
| 274 |
if (z > (1.-qtDepthEps)*ip[2]) /* who is closer? */ |
| 275 |
return; /* old one is */ |
| 276 |
tp->k[q].li = li; /* new one is */ |
| 277 |
tp->flgs |= CHF(q); |
| 278 |
break; |
| 279 |
} |
| 280 |
tp->flgs &= ~LFF(q); /* else grow tree */ |
| 281 |
tp->flgs |= CHBRF(q); |
| 282 |
tp = tp->k[q].b = newtwig(); |
| 283 |
q = 0; /* old leaf -> new branch */ |
| 284 |
mx = ip[0] * odev.hres; |
| 285 |
my = ip[1] * odev.vres; |
| 286 |
if (mx >= (x0 + x1) >> 1) q |= 01; |
| 287 |
if (my >= (y0 + y1) >> 1) q |= 02; |
| 288 |
tp->k[q].li = lo; |
| 289 |
tp->flgs |= LFF(q)|CH_ANY; /* all new */ |
| 290 |
} |
| 291 |
} |
| 292 |
|
| 293 |
|
| 294 |
dev_value(c, p) /* add a pixel value to our output queue */ |
| 295 |
COLR c; |
| 296 |
FVECT p; |
| 297 |
{ |
| 298 |
register int li; |
| 299 |
|
| 300 |
li = newleaf(); |
| 301 |
VCOPY(qtL.wp[li], p); |
| 302 |
tmCvColrs(&qtL.brt[li], qtL.chr[li], c, 1); |
| 303 |
addleaf(li); |
| 304 |
} |
| 305 |
|
| 306 |
|
| 307 |
qtReplant() /* replant our tree using new view */ |
| 308 |
{ |
| 309 |
register int i; |
| 310 |
/* anything to replant? */ |
| 311 |
if (qtL.bl == qtL.tl) |
| 312 |
return; |
| 313 |
qtFreeTree(0); /* blow the old tree away */ |
| 314 |
/* regrow it in new place */ |
| 315 |
for (i = qtL.bl; i != qtL.tl; ) { |
| 316 |
addleaf(i); |
| 317 |
if (++i >= qtL.nl) i = 0; |
| 318 |
} |
| 319 |
} |
| 320 |
|
| 321 |
|
| 322 |
qtMapLeaves(redo) /* map our leaves to RGB */ |
| 323 |
int redo; |
| 324 |
{ |
| 325 |
int aorg, alen, borg, blen; |
| 326 |
/* already done? */ |
| 327 |
if (qtL.tml == qtL.tl) |
| 328 |
return(1); |
| 329 |
if (redo) |
| 330 |
qtL.tml = qtL.bl; |
| 331 |
/* compute segments */ |
| 332 |
aorg = qtL.tml; |
| 333 |
if (qtL.tl >= aorg) { |
| 334 |
alen = qtL.tl - aorg; |
| 335 |
blen = 0; |
| 336 |
} else { |
| 337 |
alen = qtL.nl - aorg; |
| 338 |
borg = 0; |
| 339 |
blen = qtL.tl; |
| 340 |
} |
| 341 |
/* (re)compute tone mapping? */ |
| 342 |
if (qtL.tml == qtL.bl) { |
| 343 |
tmClearHisto(); |
| 344 |
tmAddHisto(qtL.brt+aorg, alen, 1); |
| 345 |
if (blen > 0) |
| 346 |
tmAddHisto(qtL.brt+borg, blen, 1); |
| 347 |
if (tmComputeMapping(0., 0., 0.) != TM_E_OK) |
| 348 |
return(0); |
| 349 |
} |
| 350 |
if (tmMapPixels(qtL.rgb+aorg, qtL.brt+aorg, |
| 351 |
qtL.chr+aorg, alen) != TM_E_OK) |
| 352 |
return(0); |
| 353 |
if (blen > 0) |
| 354 |
tmMapPixels(qtL.rgb+borg, qtL.brt+borg, |
| 355 |
qtL.chr+borg, blen); |
| 356 |
qtL.tml = qtL.tl; |
| 357 |
return(1); |
| 358 |
} |
| 359 |
|
| 360 |
|
| 361 |
static |
| 362 |
redraw(ca, tp, x0, y0, x1, y1, l) /* redraw portion of a tree */ |
| 363 |
BYTE ca[3]; /* returned average color */ |
| 364 |
register RTREE *tp; |
| 365 |
int x0, y0, x1, y1; |
| 366 |
int l[2][2]; |
| 367 |
{ |
| 368 |
int csm[3], nc; |
| 369 |
register BYTE *cp; |
| 370 |
BYTE rgb[3]; |
| 371 |
int quads = CH_ANY; |
| 372 |
int mx, my; |
| 373 |
register int i; |
| 374 |
/* compute midpoint */ |
| 375 |
mx = (x0 + x1) >> 1; |
| 376 |
my = (y0 + y1) >> 1; |
| 377 |
/* see what to do */ |
| 378 |
if (l[0][0] >= mx) |
| 379 |
quads &= ~(CHF(2)|CHF(0)); |
| 380 |
else if (l[0][1] <= mx) |
| 381 |
quads &= ~(CHF(3)|CHF(1)); |
| 382 |
if (l[1][0] >= my) |
| 383 |
quads &= ~(CHF(1)|CHF(0)); |
| 384 |
else if (l[1][1] <= my) |
| 385 |
quads &= ~(CHF(3)|CHF(2)); |
| 386 |
tp->flgs &= ~quads; /* mark them done */ |
| 387 |
csm[0] = csm[1] = csm[2] = nc = 0; |
| 388 |
/* do leaves first */ |
| 389 |
for (i = 0; i < 4; i++) |
| 390 |
if (quads & CHF(i) && tp->flgs & LFF(i)) { |
| 391 |
dev_paintr(cp=qtL.rgb[tp->k[i].li], |
| 392 |
i&01 ? mx : x0, i&02 ? my : y0, |
| 393 |
i&01 ? x1 : mx, i&02 ? y1 : my); |
| 394 |
csm[0] += cp[0]; csm[1] += cp[1]; csm[2] += cp[2]; |
| 395 |
nc++; |
| 396 |
quads &= ~CHF(i); |
| 397 |
} |
| 398 |
/* now do branches */ |
| 399 |
for (i = 0; i < 4; i++) |
| 400 |
if (quads & CHF(i) && tp->flgs & BRF(i)) { |
| 401 |
redraw(rgb, tp->k[i].b, i&01 ? mx : x0, i&02 ? my : y0, |
| 402 |
i&01 ? x1 : mx, i&02 ? y1 : my, l); |
| 403 |
csm[0] += rgb[0]; csm[1] += rgb[1]; csm[2] += rgb[2]; |
| 404 |
nc++; |
| 405 |
quads &= ~CHF(i); |
| 406 |
} |
| 407 |
if (nc > 1) { |
| 408 |
ca[0] = csm[0]/nc; ca[1] = csm[1]/nc; ca[2] = csm[2]/nc; |
| 409 |
} else { |
| 410 |
ca[0] = csm[0]; ca[1] = csm[1]; ca[2] = csm[2]; |
| 411 |
} |
| 412 |
if (!quads) return; |
| 413 |
/* fill in gaps with average */ |
| 414 |
for (i = 0; i < 4; i++) |
| 415 |
if (quads & CHF(i)) |
| 416 |
dev_paintr(ca, i&01 ? mx : x0, i&02 ? my : y0, |
| 417 |
i&01 ? x1 : mx, i&02 ? y1 : my); |
| 418 |
} |
| 419 |
|
| 420 |
|
| 421 |
static |
| 422 |
update(ca, tp, x0, y0, x1, y1) /* update tree display as needed */ |
| 423 |
BYTE ca[3]; /* returned average color */ |
| 424 |
register RTREE *tp; |
| 425 |
int x0, y0, x1, y1; |
| 426 |
{ |
| 427 |
int csm[3], nc; |
| 428 |
register BYTE *cp; |
| 429 |
BYTE rgb[3]; |
| 430 |
int gaps = 0; |
| 431 |
int mx, my; |
| 432 |
register int i; |
| 433 |
/* compute midpoint */ |
| 434 |
mx = (x0 + x1) >> 1; |
| 435 |
my = (y0 + y1) >> 1; |
| 436 |
csm[0] = csm[1] = csm[2] = nc = 0; |
| 437 |
/* do leaves first */ |
| 438 |
for (i = 0; i < 4; i++) { |
| 439 |
if (!(tp->flgs & CHF(i))) |
| 440 |
continue; |
| 441 |
if (tp->flgs & LFF(i)) { |
| 442 |
dev_paintr(cp=qtL.rgb[tp->k[i].li], |
| 443 |
i&01 ? mx : x0, i&02 ? my : y0, |
| 444 |
i&01 ? x1 : mx, i&02 ? y1 : my); |
| 445 |
csm[0] += cp[0]; csm[1] += cp[1]; csm[2] += cp[2]; |
| 446 |
nc++; |
| 447 |
} else if (!(tp->flgs & BRF(i))) |
| 448 |
gaps |= 1<<i; /* empty stem */ |
| 449 |
} |
| 450 |
/* now do branches */ |
| 451 |
for (i = 0; i < 4; i++) |
| 452 |
if ((tp->flgs & CHBRF(i)) == CHBRF(i)) { |
| 453 |
update(rgb, tp->k[i].b, i&01 ? mx : x0, i&02 ? my : y0, |
| 454 |
i&01 ? x1 : mx, i&02 ? y1 : my); |
| 455 |
csm[0] += rgb[0]; csm[1] += rgb[1]; csm[2] += rgb[2]; |
| 456 |
nc++; |
| 457 |
} |
| 458 |
if (nc > 1) { |
| 459 |
ca[0] = csm[0]/nc; ca[1] = csm[1]/nc; ca[2] = csm[2]/nc; |
| 460 |
} else { |
| 461 |
ca[0] = csm[0]; ca[1] = csm[1]; ca[2] = csm[2]; |
| 462 |
} |
| 463 |
/* fill in gaps with average */ |
| 464 |
for (i = 0; gaps && i < 4; gaps >>= 1, i++) |
| 465 |
if (gaps & 01) |
| 466 |
dev_paintr(ca, i&01 ? mx : x0, i&02 ? my : y0, |
| 467 |
i&01 ? x1 : mx, i&02 ? y1 : my); |
| 468 |
tp->flgs &= ~CH_ANY; /* all done */ |
| 469 |
} |
| 470 |
|
| 471 |
|
| 472 |
qtRedraw(x0, y0, x1, y1) /* redraw part or all of our screen */ |
| 473 |
int x0, y0, x1, y1; |
| 474 |
{ |
| 475 |
int lim[2][2]; |
| 476 |
BYTE ca[3]; |
| 477 |
|
| 478 |
if (is_stump(&qtrunk)) |
| 479 |
return; |
| 480 |
if (!qtMapLeaves((lim[0][0]=x0) <= 0 & (lim[1][0]=y0) <= 0 & |
| 481 |
(lim[0][1]=x1) >= odev.hres-1 & (lim[1][1]=y1) >= odev.vres-1)) |
| 482 |
return; |
| 483 |
redraw(ca, &qtrunk, 0, 0, odev.hres, odev.vres, lim); |
| 484 |
} |
| 485 |
|
| 486 |
|
| 487 |
qtUpdate() /* update our tree display */ |
| 488 |
{ |
| 489 |
BYTE ca[3]; |
| 490 |
|
| 491 |
if (is_stump(&qtrunk)) |
| 492 |
return; |
| 493 |
if (!qtMapLeaves(0)) |
| 494 |
return; |
| 495 |
update(ca, &qtrunk, 0, 0, odev.hres, odev.vres); |
| 496 |
} |
