void PickCandidate(ref PackCandidate pc)
{
var box = this.input[this._toPack[pc.packIndex]];
for (
pc.skylineIndex = 0;
pc.skylineIndex < this.skylines.Count;
++pc.skylineIndex
)
{
var skyline = this.skylines[pc.skylineIndex];
if (box.h + skyline.h > bin.h)
{
continue;
}
// if (box.h + skyline.h - this.lowestSky > this.spreadFactor) {
// continue;
// }
pc.spreadSatisfied = (box.h + skyline.h - this.lowestSky) <= this.spreadFactor;
pc.h = skyline.h;
if (skyline.rFit >= box.w)
{
pc.crossingCount = 1;
pc.fitNum = 0;
if (box.w == skyline.w)
{
pc.fitNum += 1;
}
if (box.h + skyline.h == bin.h)
{
pc.fitNum += 1;
}
if (pc.skylineIndex > 0 && box.h == (this.skylines[pc.skylineIndex - 1].h - skyline.h))
{
pc.fitNum += 1;
}
pc.localWaste = 0;
for (
var widthLeft = box.w - skyline.w;
widthLeft > 0;
pc.crossingCount++
)
{
var nsi = pc.crossingCount + pc.skylineIndex;
UnityEngine.Debug.Assert(nsi < this.skylines.Count);
var ns = this.skylines[nsi];
UnityEngine.Debug.Assert(skyline.h > ns.h);
pc.localWaste += (ns.w) * (skyline.h - ns.h);
widthLeft -= ns.w;
}
var mh = pc.h + box.h;
// left
for (int li = pc.skylineIndex - 1, lw = 0, ml = 0; li >= 0; li--)
{
var left = skylines[li];
if (left.h > mh)
{
if (ml < this.hSpread)
{
// if (true) {
pc.localWaste += lw;
}
break;
}
ml += left.w;
lw += (mh - left.h) * left.w;
}
{ // right
var crossIdx = pc.crossingCount + pc.skylineIndex - 1;
var cross = this.skylines[crossIdx];
var mr = (cross.w + cross.x - skyline.x - box.w);
UnityEngine.Debug.Assert(mr >= 0);
var rw = (mh - cross.h) * mr;
for (int ri = crossIdx + 1; ri < this.skylines.Count; ++ri)
{
var right = skylines[ri];
if (right.h > mh)
{
if (mr < this.hSpread)
{
pc.localWaste += rw;
}
break;
}
mr += right.w;
rw += (mh - right.h) * right.w;
}
}
// upper
if (bin.h - mh < this.minHeight)
{
pc.localWaste += (bin.h - mh) * box.w;
}
packCandidates.Add(pc);
}
if (skyline.lFit >= box.w)
{
pc.crossingCount = -1;
pc.fitNum = 0;
if (box.w == skyline.w)
{
pc.fitNum += 1;
}
if (box.h + skyline.h == bin.h)
{
pc.fitNum += 1;
}
if (pc.skylineIndex < (this.skylines.Count - 1) && box.h == (this.skylines[pc.skylineIndex + 1].h - skyline.h))
{
pc.fitNum += 1;
}
pc.localWaste = 0;
var widthLeft = box.w - skyline.w;
while (widthLeft > 0)
{
var nsi = pc.crossingCount + pc.skylineIndex;
UnityEngine.Debug.Assert(nsi >= 0);
var ns = this.skylines[nsi];
UnityEngine.Debug.Assert(skyline.h > ns.h);
pc.localWaste += (ns.w) * (skyline.h - ns.h);
widthLeft -= ns.w;
pc.crossingCount--;
}
var mh = pc.h + box.h;
// right
for (int ri = pc.skylineIndex + 1, rw = 0, mr = 0; ri < skylines.Count; ++ri)
{
var right = skylines[ri];
if (right.h > mh)
{
if (mr < this.hSpread)
{
pc.localWaste += rw;
}
break;
}
mr += right.w;
rw += (mh - right.h) * right.w;
}
{// left
var crossIdx = pc.crossingCount + pc.skylineIndex + 1;
var cross = this.skylines[crossIdx];
var ml = (skyline.x + skyline.w - box.w - cross.x);
UnityEngine.Debug.Assert(ml >= 0);
var lw = (mh - cross.h) * ml;
for (int li = crossIdx - 1; li >= 0; --li)
{
var left = skylines[li];
if (left.h > mh)
{
if (ml < this.hSpread)
{
pc.localWaste += lw;
}
break;
}
ml += left.w;
lw += (mh - left.h) * left.w;
}
}
// upper
if (bin.h - mh < this.minHeight)
{
pc.localWaste += (bin.h - mh) * box.w;
}
packCandidates.Add(pc);
}
}
}
void UpdateSkylines(PackCandidate candidate, Box box)
{
UnityEngine.Debug.Assert(candidate.skylineIndex >= 0);
UnityEngine.Debug.Assert(candidate.skylineIndex < this.skylines.Count);
this.backBuffer.EnsureCap(this.skylines.Capacity);
this.backBuffer.Clear();
if (candidate.crossingCount > 0)
{
for (int i = 0; i < candidate.skylineIndex - 1; ++i)
{
this.backBuffer.Add(this.skylines[i]);
}
var skyline = this.skylines[candidate.skylineIndex];
var oldX = skyline.x;
skyline.h += box.h;
skyline.w = box.w;
if (candidate.skylineIndex - 1 >= 0)
{
if (this.skylines[candidate.skylineIndex - 1].h != skyline.h)
{
this.backBuffer.Add(this.skylines[candidate.skylineIndex - 1]);
}
else
{
skyline.x = this.skylines[candidate.skylineIndex - 1].x;
skyline.w += oldX - skyline.x;
}
}
if (this.backBuffer.Count > 0)
{
var last = this.backBuffer[this.backBuffer.Count - 1];
}
var crossedIndex = candidate.skylineIndex + candidate.crossingCount - 1;
var crossedLast = this.skylines[crossedIndex];
var crossedEnd = crossedLast.x + crossedLast.w;
var newEnd = oldX + box.w;
if (crossedEnd != newEnd)
{
UnityEngine.Debug.Assert(crossedEnd > newEnd);
UnityEngine.Debug.Assert(crossedLast.h < skyline.h);
this.backBuffer.Add(skyline);
crossedLast.w = crossedLast.w - (newEnd - crossedLast.x);
crossedLast.x = newEnd;
this.backBuffer.Add(crossedLast);
if (crossedIndex + 1 < this.skylines.Count)
{
this.backBuffer.Add(this.skylines[crossedIndex + 1]);
}
}
else
{
if (crossedIndex + 1 < this.skylines.Count)
{
var next = this.skylines[crossedIndex + 1];
if (next.h == skyline.h)
{
skyline.w += next.w;
this.backBuffer.Add(skyline);
}
else
{
this.backBuffer.Add(skyline);
this.backBuffer.Add(next);
}
}
else
{
this.backBuffer.Add(skyline);
}
}
for (int i = crossedIndex + 2; i < this.skylines.Count; ++i)
{
this.backBuffer.Add(this.skylines[i]);
}
}
else
{
UnityEngine.Debug.Assert(candidate.crossingCount < 0);
var oldIdx = candidate.skylineIndex + candidate.crossingCount; // + 1 - 1
for (int i = 0; i < oldIdx; ++i)
{
this.backBuffer.Add(this.skylines[i]);
}
var skyline = this.skylines[candidate.skylineIndex];
var oldEnd = skyline.x + skyline.w;
skyline.h += box.h;
skyline.w = box.w;
skyline.x = oldEnd - skyline.w;
if (oldIdx >= 0)
{
var old = this.skylines[oldIdx];
if (skyline.x == old.x + old.w && old.h == skyline.h)
{
skyline.x = old.x;
skyline.w += old.w;
}
else
{
this.backBuffer.Add(old);
}
}
var crossedIdx = oldIdx + 1;
var crossed = this.skylines[crossedIdx];
if (skyline.x != crossed.x)
{
crossed.w = skyline.x - crossed.x;
this.backBuffer.Add(crossed);
}
var nextIdx = candidate.skylineIndex + 1;
if (nextIdx < this.skylines.Count)
{
var next = this.skylines[nextIdx];
if (next.h == skyline.h)
{
skyline.w += next.w;
this.backBuffer.Add(skyline);
}
else
{
this.backBuffer.Add(skyline);
this.backBuffer.Add(next);
}
}
else
{
this.backBuffer.Add(skyline);
}
for (int i = nextIdx + 1; i < this.skylines.Count; ++i)
{
this.backBuffer.Add(this.skylines[i]);
}
}
// min gap promotion
this.skylines.Clear();
for (int i = 0; i < this.backBuffer.Count; ++i)
{
var line = this.backBuffer[i];
if (line.w >= this.packDump)
{
this.skylines.Add(line);
continue;
}
int lh;
if (this.skylines.Count > 0)
{
lh = this.skylines[this.skylines.Count - 1].h;
}
else
{
lh = bin.h;
}
int rh;
if (i + 1 < this.backBuffer.Count)
{
rh = this.backBuffer[i + 1].h;
}
else
{
rh = bin.h;
}
if (lh < line.h || rh < line.h)
{
this.skylines.Add(line);
continue;
}
if (lh < rh && this.skylines.Count > 0)
{
this.skylines.Get(this.skylines.Count - 1).w += line.w;
continue;
}
if (i + 1 < this.backBuffer.Count)
{
this.backBuffer.Get(i + 1).w += line.w;
this.backBuffer.Get(i + 1).x = line.x;
continue;
}
else
{
this.skylines.Add(line); // or should we just dump it
}
}
// var tmp = this.skylines;
// this.skylines = this.backBuffer;
// this.backBuffer = tmp;
// fix lfit/rfit.
// TODO: optimize this shouldn't have been an O(n^2) op
this.lowestSky = bin.h + 1;
this.highestSky = -1;
for (int i = 0; i < this.skylines.Count; ++i)
{
var h = this.skylines.Get(i).h;
if (h > this.highestSky)
{
this.highestSky = h;
}
if (h < this.lowestSky)
{
this.lowestSky = h;
}
this.skylines.Get(i).rFit = this.skylines.Get(i).lFit = this.skylines.Get(i).w;
for (int j = i - 1; j >= 0; --j)
{
if (this.skylines.Get(j).h > this.skylines.Get(i).h)
{
break;
}
this.skylines.Get(i).lFit += this.skylines.Get(j).w;
}
for (int j = i + 1; j < this.skylines.Count; ++j)
{
if (this.skylines.Get(j).h > this.skylines.Get(i).h)
{
break;
}
this.skylines.Get(i).rFit += this.skylines.Get(j).w;
}
}
}
