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gregl |
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/* Copyright (c) 1997 Silicon Graphics, Inc. */
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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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* Quadtree display support routines for rectangle output.
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*/
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#include "standard.h"
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#include "rhd_qtree.h"
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static
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redraw(tp, x0, y0, x1, y1, l) /* mark portion of a tree for redraw */
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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 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 quadrants for update */
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/* climb the branches */
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for (i = 0; i < 4; i++)
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if (tp->flgs & BRF(i) && quads & CHF(i))
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redraw(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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}
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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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register BYTE *cp;
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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;
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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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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 & LFF(i)) {
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cp = qtL.rgb[tp->k[i].li];
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csm[0] += cp[0]; csm[1] += cp[1]; csm[2] += cp[2];
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nc++;
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if (tp->flgs & CHF(i))
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dev_paintr(cp, i&01 ? mx : x0, i&02 ? my : y0,
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i&01 ? x1 : mx, i&02 ? y1 : my);
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} else if ((tp->flgs & CHBRF(i)) == CHF(i))
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gaps |= 1<<i; /* empty stem */
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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 ((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];
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nc++;
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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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/* fill in gaps with average */
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for (i = 0; gaps && i < 4; gaps >>= 1, i++)
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if (gaps & 01)
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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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tp->flgs &= ~CH_ANY; /* all done */
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}
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qtRedraw(x0, y0, x1, y1) /* redraw part or all of our screen */
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int x0, y0, x1, y1;
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{
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int lim[2][2];
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if (is_stump(&qtrunk))
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return;
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if (!qtMapLeaves((lim[0][0]=x0) <= 0 & (lim[1][0]=y0) <= 0 &
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(lim[0][1]=x1) >= odev.hres-1 & (lim[1][1]=y1) >= odev.vres-1))
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return;
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redraw(&qtrunk, 0, 0, odev.hres, odev.vres, lim);
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}
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qtUpdate() /* update our tree display */
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{
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BYTE ca[3];
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if (is_stump(&qtrunk))
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return;
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if (!qtMapLeaves(0))
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return;
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update(ca, &qtrunk, 0, 0, odev.hres, odev.vres);
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}
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