private int[] ExpandRegions(int maxIter, int level, ref int[] srcReg, ref int[] srcDist, ref int[] dstReg, ref int[] dstDist, ref IntArray stack)
{
int w = Width;
int h = Height;
stack.Resize(0);
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
CompactCell c = Cells[x + y * w];
for (int i = (int)c.Index, ni = (int)(c.Index + c.Count); i < ni; i++)
{
if (Dist[i] >= level && srcReg[i] == 0 && Areas[i] != HeightField.NullArea)
{
stack.Push(x);
stack.Push(y);
stack.Push(i);
}
}
}
}
int iter = 0;
while (stack.Size > 0)
{
int failed = 0;
Buffer.BlockCopy(srcReg, 0, dstReg, 0, sizeof(int) * SpanCount);
Buffer.BlockCopy(srcDist, 0, dstDist, 0, sizeof(int) * SpanCount);
//Array.Copy(srcReg, dstReg, SpanCount);
//Array.Copy(srcDist, dstDist, SpanCount);
for (int j = 0; j < stack.Size; j += 3)
{
int x = stack[j + 0];
int y = stack[j + 1];
int i = stack[j + 2];
if (i < 0)
{
failed++;
continue;
}
int r = srcReg[i];
int d2 = short.MaxValue;
uint area = Areas[i];
CompactSpan s = Spans[i];
for (int dir = 0; dir < 4; dir++)
{
if (s.GetCon(dir) == NotConnected)
{
continue;
}
int ax = x + Helper.GetDirOffsetX(dir);
int ay = y + Helper.GetDirOffsetY(dir);
int ai = (int)Cells[ax + ay * w].Index + s.GetCon(dir);
if (Areas[ai] != area)
{
continue;
}
if (srcReg[ai] > 0 && (srcReg[ai] & BorderReg) == 0)
{
if (srcDist[ai] + 2 < d2)
{
r = srcReg[ai];
d2 = srcDist[ai] + 2;
}
}
}
if (r != 0)
{
stack[j + 2] = -1;
dstReg[i] = r;
dstDist[i] = d2;
}
else
{
failed++;
}
}
int[] temp = srcReg;
srcReg = dstReg;
dstReg = temp;
temp = srcDist;
srcDist = dstDist;
dstDist = temp;
if (failed * 3 == stack.Size)
{
break;
}
if (level > 0)
{
++iter;
if (iter >= maxIter)
{
break;
}
}
}
return(srcReg);
}
private bool FloodRegion(int x, int y, int i, int level, int r, ref int[] srcReg, ref int[] srcDist, ref IntArray stack)
{
int w = Width;
uint area = Areas[i];
stack.Resize(0);
stack.Push(x);
stack.Push(y);
stack.Push(i);
srcReg[i] = r;
srcDist[i] = 0;
int lev = level >= 2 ? level - 2 : 0;
int count = 0;
while (stack.Size > 0)
{
int ci = stack.Pop();
int cy = stack.Pop();
int cx = stack.Pop();
CompactSpan cs = Spans[ci];
int ar = 0;
for (int dir = 0; dir < 4; dir++)
{
if (cs.GetCon(dir) != NotConnected)
{
int ax = cx + Helper.GetDirOffsetX(dir);
int ay = cy + Helper.GetDirOffsetY(dir);
int ai = (int)Cells[ax + ay * w].Index + cs.GetCon(dir);
if (Areas[ai] != area)
{
continue;
}
int nr = srcReg[ai];
if ((nr & BorderReg) != 0)
{
continue;
}
if (nr != 0 && nr != r)
{
ar = nr;
}
CompactSpan aspan = Spans[ai];
int dir2 = (dir + 1) & 0x3;
if (aspan.GetCon(dir2) != NotConnected)
{
int ax2 = ax + Helper.GetDirOffsetX(dir2);
int ay2 = ay + Helper.GetDirOffsetY(dir2);
int ai2 = (int)Cells[ax2 + ay2 * w].Index + aspan.GetCon(dir2);
if (Areas[ai2] != area)
{
continue;
}
int nr2 = srcReg[ai2];
if (nr2 != 0 && nr2 != r)
{
ar = nr2;
}
}
}
}
if (ar != 0)
{
srcReg[ci] = 0;
continue;
}
count++;
for (int dir = 0; dir < 4; dir++)
{
if (cs.GetCon(dir) != NotConnected)
{
int ax = cx + Helper.GetDirOffsetX(dir);
int ay = cy + Helper.GetDirOffsetY(dir);
int ai = (int)Cells[ax + ay * w].Index + cs.GetCon(dir);
if (Areas[ai] != area)
{
continue;
}
if (Dist[ai] >= lev && srcReg[ai] == 0)
{
srcReg[ai] = r;
srcDist[ai] = 0;
stack.Push(ax);
stack.Push(ay);
stack.Push(ai);
}
}
}
}
return(count > 0);
}