/* 
 * PROJECT: NyARToolkit(Extension)
 * --------------------------------------------------------------------------------
 * The NyARToolkit is Java 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.Diagnostics;
using jp.nyatla.nyartoolkit.cs.core;

namespace jp.nyatla.nyartoolkit.cs.rpf
{


    /**
     * この関数は、NyARRgbRasterからコールします。
     */
    public class NyARGsRasterGraphicsFactory
    {
        /**
         * この関数は、i_rasterを操作するピクセルドライバインスタンスを生成します。
         * @param i_raster
         * @return
         * @throws NyARException
         */
        public static INyARGsRasterGraphics createDriver(INyARGrayscaleRaster i_raster)
        {
            switch (i_raster.getBufferType())
            {
                case NyARBufferType.INT1D_GRAY_8:
                    return new NyARGsRasterGraphics_GS_INT8(i_raster);
                default:
                    break;
            }
            throw new NyARException();
        }
    }


    /**
     * このインタフェイスは、グレースケール画像に対するグラフィクス機能を定義します。
     */
    class NyARGsRasterGraphics_GS_INT8 : INyARGsRasterGraphics
    {
        private INyARGrayscaleRaster _raster;

        public NyARGsRasterGraphics_GS_INT8(INyARGrayscaleRaster i_raster)
        {
            this._raster = i_raster;
        }
        public void fill(int i_value)
        {
            int[] buf = (int[])this._raster.getBuffer();
            NyARIntSize s = this._raster.getSize();
            for (int i = s.h * s.w - 1; i >= 0; i--)
            {
                buf[i] = i_value;
            }
        }
        public void copyTo(int i_left, int i_top, int i_skip, INyARGrayscaleRaster o_output)
        {
            Debug.Assert(this._raster.getSize().isInnerSize(i_left + o_output.getWidth() * i_skip, i_top + o_output.getHeight() * i_skip));
            int[] input = (int[])this._raster.getBuffer();
            switch (o_output.getBufferType())
            {
                case NyARBufferType.INT1D_GRAY_8:
                    int[] output = (int[])o_output.getBuffer();
                    NyARIntSize dest_size = o_output.getSize();
                    NyARIntSize src_size = this._raster.getSize();
                    int skip_src_y = (src_size.w - dest_size.w * i_skip) + src_size.w * (i_skip - 1);
                    int pix_count = dest_size.w;
                    int pix_mod_part = pix_count - (pix_count % 8);
                    // 左上から1行づつ走査していく
                    int pt_dst = 0;
                    int pt_src = (i_top * src_size.w + i_left);
                    for (int y = dest_size.h - 1; y >= 0; y -= 1)
                    {
                        int x;
                        for (x = pix_count - 1; x >= pix_mod_part; x--)
                        {
                            output[pt_dst++] = input[pt_src];
                            pt_src += i_skip;
                        }
                        for (; x >= 0; x -= 8)
                        {
                            output[pt_dst++] = input[pt_src];
                            pt_src += i_skip;
                            output[pt_dst++] = input[pt_src];
                            pt_src += i_skip;
                            output[pt_dst++] = input[pt_src];
                            pt_src += i_skip;
                            output[pt_dst++] = input[pt_src];
                            pt_src += i_skip;
                            output[pt_dst++] = input[pt_src];
                            pt_src += i_skip;
                            output[pt_dst++] = input[pt_src];
                            pt_src += i_skip;
                            output[pt_dst++] = input[pt_src];
                            pt_src += i_skip;
                            output[pt_dst++] = input[pt_src];
                            pt_src += i_skip;
                        }
                        // スキップ
                        pt_src += skip_src_y;
                    }
                    return;
                default:
                    throw new NyARException();
            }
        }
    }
}