/* 
 * PROJECT: NyARToolkitCS
 * --------------------------------------------------------------------------------
 * This work is based on the original ARToolKit developed by
 *   Hirokazu Kato
 *   Mark Billinghurst
 *   HITLab, University of Washington, Seattle
 * http://www.hitl.washington.edu/artoolkit/
 *
 * The NyARToolkitCS is C# edition ARToolKit class library.
 * Copyright (C)2008-2009 Ryo Iizuka
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * For further information please contact.
 *	http://nyatla.jp/nyatoolkit/
 *	<airmail(at)ebony.plala.or.jp> or <nyatla(at)nyatla.jp>
 * 
 */
using System.Diagnostics;
using jp.nyatla.nyartoolkit.cs.utils;
namespace jp.nyatla.nyartoolkit.cs.core
{

    /**
     *
     */
    public class NyARLabelingImage : NyARRaster_BasicClass
    {
        private const int MAX_LABELS = 1024 * 32;
        protected int[] _ref_buf;
        private INyARBufferReader _buffer_reader;
        protected NyARLabelingLabelStack _label_list;
        protected int[] _index_table;
        protected bool _is_index_table_enable;
        public NyARLabelingImage(int i_width, int i_height)
            : base(new NyARIntSize(i_width, i_height))
        {
            this._ref_buf = new int[i_height*i_width];
            this._label_list = new NyARLabelingLabelStack(MAX_LABELS);
            this._index_table = new int[MAX_LABELS];
            this._is_index_table_enable = false;
            this._buffer_reader = new NyARBufferReader(this._ref_buf, INyARBufferReader.BUFFERFORMAT_INT2D);
            //生成時に枠を書きます。
            drawFrameEdge();
            return;
        }
        public override INyARBufferReader getBufferReader()
        {
            return this._buffer_reader;
        }
        /**
         * エッジを書きます。
         */
        public void drawFrameEdge()
        {
            int w = this._size.w;
            int h = this._size.h;
            // NyLabelingImageのイメージ初期化(枠書き)
            int[] img = (int[])this._ref_buf;
            int bottom_ptr = (h - 1) * w;
            for (int i = 0; i < w; i++)
            {
                img[i] = 0;
                img[bottom_ptr + i] = 0;
            }
            for (int i = 0; i < h; i++)
            {
                img[i * w] = 0;
                img[(i + 1) * w - 1] = 0;
            }
            return;
        }


        /**
         * ラベリング結果がインデックステーブルを持つ場合、その配列を返します。
         * 持たない場合、nullを返します。
         * 
         * 値がnullの時はラベル番号そのものがラスタに格納されていますが、
         * null以外の時はラスタに格納されているのはインデクス番号です。
         * 
         * インデクス番号とラベル番号の関係は、以下の式で表されます。
         * ラベル番号:=value[インデクス番号]
         * 
         */
        public int[] getIndexArray()
        {
            return this._is_index_table_enable ? this._index_table : null;
        }

        public NyARLabelingLabelStack getLabelStack()
        {
            return this._label_list;
        }
        public void reset(bool i_label_index_enable)
        {
            Debug.Assert(i_label_index_enable == true);//非ラベルモードは未実装
            this._label_list.clear();
            this._is_index_table_enable = i_label_index_enable;
            return;
        }

        protected int[] _getContour_xdir = { 0, 1, 1, 1, 0, -1, -1, -1 };
        protected int[] _getContour_ydir = { -1, -1, 0, 1, 1, 1, 0, -1 };
        /**
         * i_labelのラベルの、クリップ領域が上辺に接しているx座標を返します。
         * @param i_index
         * @return
         */
        public int getTopClipTangentX(NyARLabelingLabel i_label)
        {
		    int pix;
		    int i_label_id=i_label.id;
		    int[] index_table=this._index_table;
		    int[] limage=this._ref_buf;
		    int limage_ptr=i_label.clip_t*this._size.w;
		    int clip1 = i_label.clip_r;
		    // p1=ShortPointer.wrap(limage,j*xsize+clip.get());//p1 =&(limage[j*xsize+clip[0]]);
		    for (int i = i_label.clip_l; i <= clip1; i++) {// for( i = clip[0]; i <=clip[1]; i++, p1++ ) {
			    pix = limage[limage_ptr+i];
			    if (pix > 0 && index_table[pix-1] == i_label_id){
				    return i;
			    }
		    }
		    //あれ？見つからないよ？
		    throw new NyARException();
        }
    }
}