/* 
 * 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>
 * 
 */
package jp.nyatla.nyartoolkit.rpf.utils;

import jp.nyatla.nyartoolkit.core.NyARException;
import jp.nyatla.nyartoolkit.core.raster.INyARGrayscaleRaster;
import jp.nyatla.nyartoolkit.core.types.NyARBufferType;
import jp.nyatla.nyartoolkit.core.types.NyARIntSize;


/**
 * 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) throws NyARException
	{
		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 implements 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) throws NyARException
	{
		assert (this._raster.getSize().isInnerSize(i_left + o_output.getWidth() * i_skip, i_top+ o_output.getHeight() * i_skip));		
		final int[] input = (int[]) this._raster.getBuffer();
		switch(o_output.getBufferType())
		{
		case NyARBufferType.INT1D_GRAY_8:
			final 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);
			final int pix_count = dest_size.w;
			final 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();
		}
	}
}