internal OcTreeQuantizer(int colorDepth)
{
if (colorDepth > 8)
{
throw new ArgumentOutOfRangeException("colorDepth", colorDepth, "颜色深度不能大于8");
}
if (colorDepth <= 0)
{
throw new ArgumentOutOfRangeException("colorDepth", colorDepth, "颜色深度不能小于1");
}
maxColors = 1 << colorDepth;
tree = new OcTree(colorDepth);
}
/// <summary>
/// 八叉树的构造函数
/// </summary>
/// <param name="leaf">是否是叶子节点</param>
/// <param name="level">层级</param>
/// <param name="parent">父节点</param>
internal OcTreeNode(int colorDepth, int level, OcTree tree)
{
this.ColorDepth = colorDepth;
this.Leaf = (colorDepth == level);
this.Level = level;
if (!Leaf)
{
NextReducible = tree.ReducibleNodes[level];
tree.ReducibleNodes[level] = this;
Children = new OcTreeNode[8];
}
else
{
tree.IncrementLeaves();
}
}
internal void AddColor(Color32 *pixel, int level, OcTree tree)
{
//如果是树叶了，表示一个颜色像素添加完成
if (this.Leaf)
{
Increment(pixel);
tree.TracePrevious(this);
return;
}
int shift = 7 - level;
int index = ((pixel->Red & mask[level]) >> (shift - 2)) |
((pixel->Green & mask[level]) >> (shift - 1)) |
((pixel->Blue & mask[level]) >> (shift));
OcTreeNode child = Children[index];
if (child == null)
{
child = new OcTreeNode(ColorDepth, level + 1, tree);
Children[index] = child;
}
child.AddColor(pixel, ++level, tree);
}