src/hd/rhd_qtree.c

/* Copyright (c) 1997 Silicon Graphics, Inc. */

#ifndef lint
static char SCCSid[] = "$SunId$ SGI";
#endif

/*
 * Quadtree driver support routines.
 */

#include "standard.h"
#include "rhd_qtree.h"
                                /* quantity of leaves to free at a time */
#ifndef LFREEPCT
#define LFREEPCT        25
#endif

RTREE   qtrunk;                 /* our quadtree trunk */
double  qtDepthEps = .02;       /* epsilon to compare depths (z fraction) */
int     qtMinNodesiz = 2;       /* minimum node dimension (pixels) */
struct rleaves  qtL;            /* our pile of leaves */

#define TBUNDLESIZ      409     /* number of twigs in a bundle */

static RTREE    **twigbundle;   /* free twig blocks (NULL term.) */
static int      nexttwig;       /* next free twig */


static RTREE *
newtwig()                       /* allocate a twig */
{
        register int    bi;

        if (twigbundle == NULL) {       /* initialize */
                twigbundle = (RTREE **)malloc(sizeof(RTREE *));
                if (twigbundle == NULL)
                        goto memerr;
                twigbundle[0] = NULL;
        }
        bi = nexttwig / TBUNDLESIZ;
        if (twigbundle[bi] == NULL) {   /* new block */
                twigbundle = (RTREE **)realloc((char *)twigbundle,
                                        (bi+2)*sizeof(RTREE *));
                if (twigbundle == NULL)
                        goto memerr;
                twigbundle[bi] = (RTREE *)calloc(TBUNDLESIZ, sizeof(RTREE));
                if (twigbundle[bi] == NULL)
                        goto memerr;
                twigbundle[bi+1] = NULL;
        }
                                /* nexttwig++ % TBUNDLESIZ */
        return(twigbundle[bi] + (nexttwig++ - bi*TBUNDLESIZ));
memerr:
        error(SYSTEM, "out of memory in newtwig");
}


qtFreeTree(really)              /* free allocated twigs */
int     really;
{
        register int    i;

        qtrunk.flgs = CH_ANY;   /* chop down tree */
        if (twigbundle == NULL)
                return;
        i = (TBUNDLESIZ-1+nexttwig)/TBUNDLESIZ;
        nexttwig = 0;
        if (!really) {          /* just clear allocated blocks */
                while (i--)
                        bzero((char *)twigbundle[i], TBUNDLESIZ*sizeof(RTREE));
                return;
        }
                                /* else "really" means free up memory */
        for (i = 0; twigbundle[i] != NULL; i++)
                free((char *)twigbundle[i]);
        free((char *)twigbundle);
        twigbundle = NULL;
}


static int
newleaf()                       /* allocate a leaf from our pile */
{
        int     li;
        
        li = qtL.tl++;
        if (qtL.tl >= qtL.nl)   /* get next leaf in ring */
                qtL.tl = 0;
        if (qtL.tl == qtL.bl)   /* need to shake some free */
                qtCompost(LFREEPCT);
        return(li);
}


#define LEAFSIZ         (3*sizeof(float)+sizeof(TMbright)+6*sizeof(BYTE))

int
qtAllocLeaves(n)                /* allocate space for n leaves */
register int    n;
{
        unsigned        nbytes;
        register unsigned       i;

        qtFreeTree(0);          /* make sure tree is empty */
        if (n <= 0)
                return(0);
        if (qtL.nl >= n)
                return(qtL.nl);
        else if (qtL.nl > 0)
                free(qtL.base);
                                /* round space up to nearest power of 2 */
        nbytes = n*LEAFSIZ + 8;
        for (i = 1024; nbytes > i; i <<= 1)
                ;
        n = (i - 8) / LEAFSIZ;  /* should we make sure n is even? */
        qtL.base = (char *)malloc(n*LEAFSIZ);
        if (qtL.base == NULL)
                return(0);
                                /* assign larger alignment types earlier */
        qtL.wp = (float (*)[3])qtL.base;
        qtL.brt = (TMbright *)(qtL.wp + n);
        qtL.chr = (BYTE (*)[3])(qtL.brt + n);
        qtL.rgb = (BYTE (*)[3])(qtL.chr + n);
        qtL.nl = n;
        qtL.tml = qtL.bl = qtL.tl = 0;
        return(n);
}

#undef  LEAFSIZ


qtFreeLeaves()                  /* free our allocated leaves and twigs */
{
        qtFreeTree(1);          /* free tree also */
        if (qtL.nl <= 0)
                return;
        free(qtL.base);
        qtL.base = NULL;
        qtL.nl = 0;
}


static
shaketree(tp)                   /* shake dead leaves from tree */
register RTREE  *tp;
{
        register int    i, li;

        for (i = 0; i < 4; i++)
                if (tp->flgs & BRF(i)) {
                        shaketree(tp->k[i].b);
                        if (is_stump(tp->k[i].b))
                                tp->flgs &= ~BRF(i);
                } else if (tp->flgs & LFF(i)) {
                        li = tp->k[i].li;
                        if (qtL.bl < qtL.tl ?
                                (li < qtL.bl || li >= qtL.tl) :
                                (li < qtL.bl && li >= qtL.tl))
                                tp->flgs &= ~LFF(i);
                }
}


int
qtCompost(pct)                  /* free up some leaves */
int     pct;
{
        int     nused, nclear, nmapped;

                                /* figure out how many leaves to clear */
        nclear = qtL.nl * pct / 100;
        nused = qtL.tl - qtL.bl;
        if (nused <= 0) nused += qtL.nl;
        nclear -= qtL.nl - nused;
        if (nclear <= 0)
                return(0);
        if (nclear >= nused) {  /* clear them all */
                qtFreeTree(0);
                qtL.tml = qtL.bl = qtL.tl = 0;
                return(nused);
        }
                                /* else clear leaves from bottom */
        nmapped = qtL.tml - qtL.bl;
        if (nmapped < 0) nmapped += qtL.nl;
        qtL.bl += nclear;
        if (qtL.bl >= qtL.nl) qtL.bl -= qtL.nl;
        if (nmapped <= nclear) qtL.tml = qtL.bl;
        shaketree(&qtrunk);
        return(nclear);
}


int
qtFindLeaf(x, y)                /* find closest leaf to (x,y) */
int     x, y;
{
        register RTREE  *tp = &qtrunk;
        int     li = -1;
        int     x0=0, y0=0, x1=odev.hres, y1=odev.vres;
        int     mx, my;
        register int    q;
                                        /* check limits */
        if (x < 0 || x >= odev.hres || y < 0 || y >= odev.vres)
                return(-1);
                                        /* find nearby leaf in our tree */
        for ( ; ; ) {
                for (q = 0; q < 4; q++)         /* find any leaf this level */
                        if (tp->flgs & LFF(q)) {
                                li = tp->k[q].li;
                                break;
                        }
                q = 0;                          /* which quadrant are we? */
                mx = (x0 + x1) >> 1;
                my = (y0 + y1) >> 1;
                if (x < mx) x1 = mx;
                else {x0 = mx; q |= 01;}
                if (y < my) y1 = my;
                else {y0 = my; q |= 02;}
                if (tp->flgs & BRF(q)) {        /* branch down if not a leaf */
                        tp = tp->k[q].b;
                        continue;
                }
                if (tp->flgs & LFF(q))          /* good shot! */
                        return(tp->k[q].li);
                return(li);                     /* else return what we have */
        }
}


static
addleaf(li)                     /* add a leaf to our tree */
int     li;
{
        register RTREE  *tp = &qtrunk;
        int     x0=0, y0=0, x1=odev.hres, y1=odev.vres;
        int     lo = -1;
        int     x, y, mx, my;
        double  z;
        FVECT   ip, wp;
        register int    q;
                                        /* compute leaf location */
        VCOPY(wp, qtL.wp[li]);
        viewloc(ip, &odev.v, wp);
        if (ip[2] <= 0. || ip[0] < 0. || ip[0] >= 1.
                        || ip[1] < 0. || ip[1] >= 1.)
                return;
        x = ip[0] * odev.hres;
        y = ip[1] * odev.vres;
        z = ip[2];
                                        /* find the place for it */
        for ( ; ; ) {
                q = 0;                          /* which quadrant? */
                mx = (x0 + x1) >> 1;
                my = (y0 + y1) >> 1;
                if (x < mx) x1 = mx;
                else {x0 = mx; q |= 01;}
                if (y < my) y1 = my;
                else {y0 = my; q |= 02;}
                if (tp->flgs & BRF(q)) {        /* move to next branch */
                        tp->flgs |= CHF(q);             /* not sure; guess */
                        tp = tp->k[q].b;
                        continue;
                }
                if (!(tp->flgs & LFF(q))) {     /* found stem for leaf */
                        tp->k[q].li = li;
                        tp->flgs |= CHLFF(q);
                        break;
                }       
                                                /* check existing leaf */
                if (lo != tp->k[q].li) {
                        lo = tp->k[q].li;
                        VCOPY(wp, qtL.wp[lo]);
                        viewloc(ip, &odev.v, wp);
                }
                                                /* is node minimum size? */
                if (x1-x0 <= qtMinNodesiz || y1-y0 <= qtMinNodesiz) {
                        if (z > (1.-qtDepthEps)*ip[2])  /* who is closer? */
                                return;                 /* old one is */
                        tp->k[q].li = li;               /* new one is */
                        tp->flgs |= CHF(q);
                        break;
                }
                tp->flgs &= ~LFF(q);            /* else grow tree */
                tp->flgs |= CHBRF(q);
                tp = tp->k[q].b = newtwig();
                q = 0;                          /* old leaf -> new branch */
                mx = ip[0] * odev.hres;
                my = ip[1] * odev.vres;
                if (mx >= (x0 + x1) >> 1) q |= 01;
                if (my >= (y0 + y1) >> 1) q |= 02;
                tp->k[q].li = lo;
                tp->flgs |= LFF(q)|CH_ANY;      /* all new */
        }
}


dev_value(c, p)                 /* add a pixel value to our quadtree */
COLR    c;
FVECT   p;
{
        register int    li;

        li = newleaf();
        VCOPY(qtL.wp[li], p);
        tmCvColrs(&qtL.brt[li], qtL.chr[li], c, 1);
        addleaf(li);
}


qtReplant()                     /* replant our tree using new view */
{
        register int    i;
                                        /* anything to replant? */
        if (qtL.bl == qtL.tl)
                return;
        qtFreeTree(0);                  /* blow the old tree away */
                                        /* regrow it in new place */
        for (i = qtL.bl; i != qtL.tl; ) {
                addleaf(i);
                if (++i >= qtL.nl) i = 0;
        }
}


qtMapLeaves(redo)               /* map our leaves to RGB */
int     redo;
{
        int     aorg, alen, borg, blen;
                                        /* recompute mapping? */
        if (redo)
                qtL.tml = qtL.bl;
                                        /* already done? */
        if (qtL.tml == qtL.tl)
                return(1);
                                        /* compute segments */
        aorg = qtL.tml;
        if (qtL.tl >= aorg) {
                alen = qtL.tl - aorg;
                blen = 0;
        } else {
                alen = qtL.nl - aorg;
                borg = 0;
                blen = qtL.tl;
        }
                                        /* (re)compute tone mapping? */
        if (qtL.tml == qtL.bl) {
                tmClearHisto();
                tmAddHisto(qtL.brt+aorg, alen, 1);
                if (blen > 0)
                        tmAddHisto(qtL.brt+borg, blen, 1);
                if (tmComputeMapping(0., 0., 0.) != TM_E_OK)
                        return(0);
        }
        if (tmMapPixels(qtL.rgb+aorg, qtL.brt+aorg,
                        qtL.chr+aorg, alen) != TM_E_OK)
                return(0);
        if (blen > 0)
                tmMapPixels(qtL.rgb+borg, qtL.brt+borg,
                                qtL.chr+borg, blen);
        qtL.tml = qtL.tl;
        return(1);
}
Revision:	3.9
Committed:	Tue Nov 25 16:52:04 1997 UTC (26 years, 5 months ago) by gregl
Content type:	text/plain
Branch:	MAIN
Changes since 3.8:	+1 -109 lines
Log Message:	moved routines specific to rectangle update to rhd_qtree2r.c
#	User	Rev	Content
1	gregl	3.1	/* 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	gregl	3.6	/* quantity of leaves to free at a time */
14			#ifndef LFREEPCT
15			#define LFREEPCT 25
16			#endif
17	gregl	3.1
18	gregl	3.2	RTREE qtrunk; /* our quadtree trunk */
19			double qtDepthEps = .02; /* epsilon to compare depths (z fraction) */
20			int qtMinNodesiz = 2; /* minimum node dimension (pixels) */
21	gregl	3.5	struct rleaves qtL; /* our pile of leaves */
22	gregl	3.2
23	gregl	3.1	#define TBUNDLESIZ 409 /* number of twigs in a bundle */
24
25			static RTREE *twigbundle; / free twig blocks (NULL term.) */
26			static int nexttwig; /* next free twig */
27
28
29			static RTREE *
30			newtwig() /* allocate a twig */
31			{
32			register int bi;
33
34			if (twigbundle == NULL) { /* initialize */
35			twigbundle = (RTREE *)malloc(sizeof(RTREE ));
36			if (twigbundle == NULL)
37			goto memerr;
38			twigbundle[0] = NULL;
39			}
40			bi = nexttwig / TBUNDLESIZ;
41			if (twigbundle[bi] == NULL) { /* new block */
42			twigbundle = (RTREE *)realloc((char )twigbundle,
43			(bi+2)sizeof(RTREE ));
44			if (twigbundle == NULL)
45			goto memerr;
46			twigbundle[bi] = (RTREE *)calloc(TBUNDLESIZ, sizeof(RTREE));
47			if (twigbundle[bi] == NULL)
48			goto memerr;
49			twigbundle[bi+1] = NULL;
50			}
51			/* nexttwig++ % TBUNDLESIZ */
52			return(twigbundle[bi] + (nexttwig++ - bi*TBUNDLESIZ));
53			memerr:
54			error(SYSTEM, "out of memory in newtwig");
55			}
56
57
58	gregl	3.3	qtFreeTree(really) /* free allocated twigs */
59	gregl	3.1	int really;
60			{
61			register int i;
62
63	gregl	3.7	qtrunk.flgs = CH_ANY; /* chop down tree */
64	gregl	3.1	if (twigbundle == NULL)
65			return;
66	gregl	3.7	i = (TBUNDLESIZ-1+nexttwig)/TBUNDLESIZ;
67			nexttwig = 0;
68	gregl	3.1	if (!really) { /* just clear allocated blocks */
69	gregl	3.7	while (i--)
70	gregl	3.1	bzero((char )twigbundle[i], TBUNDLESIZsizeof(RTREE));
71			return;
72			}
73			/* else "really" means free up memory */
74			for (i = 0; twigbundle[i] != NULL; i++)
75			free((char *)twigbundle[i]);
76			free((char *)twigbundle);
77			twigbundle = NULL;
78			}
79
80
81	gregl	3.5	static int
82	gregl	3.1	newleaf() /* allocate a leaf from our pile */
83			{
84	gregl	3.5	int li;
85	gregl	3.4
86	gregl	3.5	li = qtL.tl++;
87			if (qtL.tl >= qtL.nl) /* get next leaf in ring */
88			qtL.tl = 0;
89			if (qtL.tl == qtL.bl) /* need to shake some free */
90	gregl	3.1	qtCompost(LFREEPCT);
91	gregl	3.5	return(li);
92	gregl	3.1	}
93
94
95	gregl	3.5	#define LEAFSIZ (3sizeof(float)+sizeof(TMbright)+6sizeof(BYTE))
96
97	gregl	3.1	int
98			qtAllocLeaves(n) /* allocate space for n leaves */
99	gregl	3.5	register int n;
100	gregl	3.1	{
101			unsigned nbytes;
102			register unsigned i;
103
104	gregl	3.3	qtFreeTree(0); /* make sure tree is empty */
105	gregl	3.1	if (n <= 0)
106			return(0);
107	gregl	3.5	if (qtL.nl >= n)
108			return(qtL.nl);
109			else if (qtL.nl > 0)
110			free(qtL.base);
111	gregl	3.1	/* round space up to nearest power of 2 */
112	gregl	3.5	nbytes = n*LEAFSIZ + 8;
113	gregl	3.1	for (i = 1024; nbytes > i; i <<= 1)
114			;
115	gregl	3.5	n = (i - 8) / LEAFSIZ; /* should we make sure n is even? */
116			qtL.base = (char )malloc(nLEAFSIZ);
117			if (qtL.base == NULL)
118			return(0);
119			/* assign larger alignment types earlier */
120			qtL.wp = (float (*)[3])qtL.base;
121			qtL.brt = (TMbright *)(qtL.wp + n);
122			qtL.chr = (BYTE (*)[3])(qtL.brt + n);
123			qtL.rgb = (BYTE (*)[3])(qtL.chr + n);
124			qtL.nl = n;
125			qtL.tml = qtL.bl = qtL.tl = 0;
126			return(n);
127	gregl	3.1	}
128
129	gregl	3.5	#undef LEAFSIZ
130	gregl	3.1
131	gregl	3.5
132	gregl	3.1	qtFreeLeaves() /* free our allocated leaves and twigs */
133			{
134	gregl	3.3	qtFreeTree(1); /* free tree also */
135	gregl	3.5	if (qtL.nl <= 0)
136	gregl	3.1	return;
137	gregl	3.5	free(qtL.base);
138			qtL.base = NULL;
139			qtL.nl = 0;
140	gregl	3.1	}
141
142
143			static
144			shaketree(tp) /* shake dead leaves from tree */
145			register RTREE *tp;
146			{
147			register int i, li;
148
149			for (i = 0; i < 4; i++)
150	gregl	3.5	if (tp->flgs & BRF(i)) {
151	gregl	3.2	shaketree(tp->k[i].b);
152	gregl	3.5	if (is_stump(tp->k[i].b))
153			tp->flgs &= ~BRF(i);
154			} else if (tp->flgs & LFF(i)) {
155			li = tp->k[i].li;
156			if (qtL.bl < qtL.tl ?
157			(li < qtL.bl \|\| li >= qtL.tl) :
158			(li < qtL.bl && li >= qtL.tl))
159			tp->flgs &= ~LFF(i);
160	gregl	3.1	}
161			}
162
163
164			int
165			qtCompost(pct) /* free up some leaves */
166			int pct;
167			{
168	gregl	3.5	int nused, nclear, nmapped;
169	gregl	3.4
170	gregl	3.1	/* figure out how many leaves to clear */
171	gregl	3.5	nclear = qtL.nl * pct / 100;
172			nused = qtL.tl - qtL.bl;
173			if (nused <= 0) nused += qtL.nl;
174			nclear -= qtL.nl - nused;
175	gregl	3.1	if (nclear <= 0)
176			return(0);
177			if (nclear >= nused) { /* clear them all */
178	gregl	3.3	qtFreeTree(0);
179	gregl	3.5	qtL.tml = qtL.bl = qtL.tl = 0;
180	gregl	3.1	return(nused);
181			}
182			/* else clear leaves from bottom */
183	gregl	3.5	nmapped = qtL.tml - qtL.bl;
184			if (nmapped < 0) nmapped += qtL.nl;
185			qtL.bl += nclear;
186			if (qtL.bl >= qtL.nl) qtL.bl -= qtL.nl;
187			if (nmapped <= nclear) qtL.tml = qtL.bl;
188	gregl	3.1	shaketree(&qtrunk);
189			return(nclear);
190			}
191
192
193	gregl	3.5	int
194	gregl	3.3	qtFindLeaf(x, y) /* find closest leaf to (x,y) */
195			int x, y;
196			{
197			register RTREE *tp = &qtrunk;
198	gregl	3.5	int li = -1;
199	gregl	3.3	int x0=0, y0=0, x1=odev.hres, y1=odev.vres;
200			int mx, my;
201			register int q;
202			/* check limits */
203			if (x < 0 \|\| x >= odev.hres \|\| y < 0 \|\| y >= odev.vres)
204	gregl	3.5	return(-1);
205	gregl	3.3	/* find nearby leaf in our tree */
206			for ( ; ; ) {
207			for (q = 0; q < 4; q++) /* find any leaf this level */
208	gregl	3.5	if (tp->flgs & LFF(q)) {
209			li = tp->k[q].li;
210	gregl	3.3	break;
211			}
212			q = 0; /* which quadrant are we? */
213			mx = (x0 + x1) >> 1;
214			my = (y0 + y1) >> 1;
215			if (x < mx) x1 = mx;
216			else {x0 = mx; q \|= 01;}
217			if (y < my) y1 = my;
218			else {y0 = my; q \|= 02;}
219			if (tp->flgs & BRF(q)) { /* branch down if not a leaf */
220			tp = tp->k[q].b;
221			continue;
222			}
223	gregl	3.5	if (tp->flgs & LFF(q)) /* good shot! */
224			return(tp->k[q].li);
225			return(li); /* else return what we have */
226	gregl	3.3	}
227			}
228
229
230	gregl	3.1	static
231	gregl	3.5	addleaf(li) /* add a leaf to our tree */
232			int li;
233	gregl	3.1	{
234			register RTREE *tp = &qtrunk;
235			int x0=0, y0=0, x1=odev.hres, y1=odev.vres;
236	gregl	3.5	int lo = -1;
237	gregl	3.1	int x, y, mx, my;
238			double z;
239			FVECT ip, wp;
240			register int q;
241			/* compute leaf location */
242	gregl	3.5	VCOPY(wp, qtL.wp[li]);
243	gregl	3.1	viewloc(ip, &odev.v, wp);
244			if (ip[2] <= 0. \|\| ip[0] < 0. \|\| ip[0] >= 1.
245			\|\| ip[1] < 0. \|\| ip[1] >= 1.)
246			return;
247			x = ip[0] * odev.hres;
248			y = ip[1] * odev.vres;
249			z = ip[2];
250			/* find the place for it */
251			for ( ; ; ) {
252			q = 0; /* which quadrant? */
253			mx = (x0 + x1) >> 1;
254			my = (y0 + y1) >> 1;
255			if (x < mx) x1 = mx;
256			else {x0 = mx; q \|= 01;}
257			if (y < my) y1 = my;
258			else {y0 = my; q \|= 02;}
259			if (tp->flgs & BRF(q)) { /* move to next branch */
260			tp->flgs \|= CHF(q); /* not sure; guess */
261			tp = tp->k[q].b;
262			continue;
263			}
264	gregl	3.5	if (!(tp->flgs & LFF(q))) { /* found stem for leaf */
265			tp->k[q].li = li;
266			tp->flgs \|= CHLFF(q);
267	gregl	3.1	break;
268			}
269			/* check existing leaf */
270	gregl	3.5	if (lo != tp->k[q].li) {
271			lo = tp->k[q].li;
272			VCOPY(wp, qtL.wp[lo]);
273	gregl	3.1	viewloc(ip, &odev.v, wp);
274			}
275			/* is node minimum size? */
276			if (x1-x0 <= qtMinNodesiz \|\| y1-y0 <= qtMinNodesiz) {
277			if (z > (1.-qtDepthEps)ip[2]) / who is closer? */
278			return; /* old one is */
279	gregl	3.5	tp->k[q].li = li; /* new one is */
280	gregl	3.1	tp->flgs \|= CHF(q);
281			break;
282			}
283	gregl	3.5	tp->flgs &= ~LFF(q); /* else grow tree */
284			tp->flgs \|= CHBRF(q);
285	gregl	3.1	tp = tp->k[q].b = newtwig();
286			q = 0; /* old leaf -> new branch */
287			mx = ip[0] * odev.hres;
288			my = ip[1] * odev.vres;
289			if (mx >= (x0 + x1) >> 1) q \|= 01;
290			if (my >= (y0 + y1) >> 1) q \|= 02;
291	gregl	3.5	tp->k[q].li = lo;
292			tp->flgs \|= LFF(q)\|CH_ANY; /* all new */
293	gregl	3.1	}
294			}
295
296
297	gregl	3.9	dev_value(c, p) /* add a pixel value to our quadtree */
298	gregl	3.1	COLR c;
299			FVECT p;
300			{
301	gregl	3.5	register int li;
302	gregl	3.1
303	gregl	3.5	li = newleaf();
304			VCOPY(qtL.wp[li], p);
305			tmCvColrs(&qtL.brt[li], qtL.chr[li], c, 1);
306			addleaf(li);
307	gregl	3.1	}
308
309
310			qtReplant() /* replant our tree using new view */
311			{
312			register int i;
313	gregl	3.5	/* anything to replant? */
314			if (qtL.bl == qtL.tl)
315	gregl	3.1	return;
316	gregl	3.5	qtFreeTree(0); /* blow the old tree away */
317			/* regrow it in new place */
318			for (i = qtL.bl; i != qtL.tl; ) {
319			addleaf(i);
320			if (++i >= qtL.nl) i = 0;
321	gregl	3.1	}
322			}
323
324
325	gregl	3.5	qtMapLeaves(redo) /* map our leaves to RGB */
326			int redo;
327			{
328			int aorg, alen, borg, blen;
329	gregl	3.6	/* recompute mapping? */
330			if (redo)
331			qtL.tml = qtL.bl;
332	gregl	3.5	/* already done? */
333			if (qtL.tml == qtL.tl)
334			return(1);
335			/* compute segments */
336			aorg = qtL.tml;
337			if (qtL.tl >= aorg) {
338			alen = qtL.tl - aorg;
339			blen = 0;
340			} else {
341			alen = qtL.nl - aorg;
342			borg = 0;
343			blen = qtL.tl;
344			}
345			/* (re)compute tone mapping? */
346			if (qtL.tml == qtL.bl) {
347			tmClearHisto();
348			tmAddHisto(qtL.brt+aorg, alen, 1);
349			if (blen > 0)
350			tmAddHisto(qtL.brt+borg, blen, 1);
351			if (tmComputeMapping(0., 0., 0.) != TM_E_OK)
352			return(0);
353			}
354			if (tmMapPixels(qtL.rgb+aorg, qtL.brt+aorg,
355			qtL.chr+aorg, alen) != TM_E_OK)
356			return(0);
357			if (blen > 0)
358			tmMapPixels(qtL.rgb+borg, qtL.brt+borg,
359			qtL.chr+borg, blen);
360			qtL.tml = qtL.tl;
361			return(1);
362	gregl	3.1	}