/* 
 * 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;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;

namespace jp.nyatla.nyartoolkit.cs.core
{
    /**
     * RGBラスタをGrayScaleに変換するフィルタを作成します。
     * このフィルタは、RGB値の平均値を、(R+G+B)/3で算出します。
     *
     */
    public class NyARRasterFilter_Rgb2Gs_AveAdd : INyARRasterFilter_RgbToGs
    {
        IdoThFilterImpl _do_filter_impl;
        public NyARRasterFilter_Rgb2Gs_AveAdd(int i_raster_type)
        {
            switch (i_raster_type)
            {
                case INyARBufferReader.BUFFERFORMAT_BYTE1D_B8G8R8_24:
                case INyARBufferReader.BUFFERFORMAT_BYTE1D_R8G8B8_24:
                    this._do_filter_impl = new doThFilterImpl_BYTE1D_B8G8R8_24();
                    break;
                case INyARBufferReader.BUFFERFORMAT_BYTE1D_B8G8R8X8_32:
                    this._do_filter_impl = new doThFilterImpl_BYTE1D_B8G8R8X8_32();
                    break;
                default:
                    throw new NyARException();
            }
        }
        public void doFilter(INyARRgbRaster i_input, NyARGrayscaleRaster i_output)
        {
            INyARBufferReader in_buffer_reader = i_input.getBufferReader();
            INyARBufferReader out_buffer_reader = i_output.getBufferReader();
            Debug.Assert(i_input.getSize().isEqualSize(i_output.getSize()) == true);
            this._do_filter_impl.doFilter(in_buffer_reader, out_buffer_reader, i_input.getSize());
            return;
        }

        /*
         * ここから各種ラスタ向けのフィルタ実装
         *
         */
        interface IdoThFilterImpl
        {
            void doFilter(INyARBufferReader i_input, INyARBufferReader i_output, NyARIntSize i_size);
        }
        class doThFilterImpl_BYTE1D_B8G8R8_24 : IdoThFilterImpl
        {
            public void doFilter(INyARBufferReader i_input, INyARBufferReader i_output, NyARIntSize i_size)
            {
                int[] out_buf = (int[])i_output.getBuffer();
                byte[] in_buf = (byte[])i_input.getBuffer();

                int bp = 0;
                for (int y = 0; y < i_size.h; y++)
                {
                    for (int x = 0; x < i_size.w; x++)
                    {
                        out_buf[y * i_size.w + x] = ((in_buf[bp] & 0xff) + (in_buf[bp + 1] & 0xff) + (in_buf[bp + 2] & 0xff)) / 3;
                        bp += 3;
                    }
                }
                return;
            }
        }
        class doThFilterImpl_BYTE1D_B8G8R8X8_32 : IdoThFilterImpl
        {
            public void doFilter(INyARBufferReader i_input, INyARBufferReader i_output, NyARIntSize i_size)
            {
                int[] out_buf = (int[])i_output.getBuffer();
                byte[] in_buf = (byte[])i_input.getBuffer();

                int bp = 0;
                for (int y = 0; y < i_size.h; y++)
                {
                    for (int x = 0; x < i_size.w; x++)
                    {
                        out_buf[y * i_size.w + x] = ((in_buf[bp] & 0xff) + (in_buf[bp + 1] & 0xff) + (in_buf[bp + 2] & 0xff)) / 3;
                        bp += 4;
                    }
                }
            }
        }



    }
}
