/*   エッジ強調 ImageFilter  Ver 0.10   */
/*                                      */
/*                                      */
/*   by Atsushi                98/4/9   */


package net.antun.lib.awt.image;

import java.awt.Dimension;
import java.awt.image.ColorModel;


public class EmphasisImageFilter extends SinglepassImageFilter
{
	/*   ---   Field   ---   */

	private double strength;

	/*   ---   Constructor   ---   */

	public EmphasisImageFilter(double strength)
	{
		this.strength=strength;
	}

	/*   ---   フィルタリング   ---   */

	public void setDimensions(int width,int height)
	{
		super.setDimensions(width,height);
		consumer.setDimensions(width,height);
	}

	protected void filterImage()
	{
		int rgb,p[];
		int r,g,b,a,r0,g0,b0,a0;
	
		p=new int[originalSize.width];
		for (int y=0;y<=originalSize.height-1;y++)
		{
			for (int x=0;x<=originalSize.width-1;x++)
			{
				rgb=original[x+y*originalSize.width];
				a=a0=(rgb>>24) & 0xff;
				r=r0=(rgb>>16) & 0xff;
				g=g0=(rgb>> 8) & 0xff;
				b=b0=(rgb>> 0) & 0xff;
				for (int ix=-1;ix<=1;ix++)
				{
					for (int iy=-1;iy<=1;iy++)
					{
						if (0<=x+ix && x+ix<originalSize.width &&
						    0<=y+iy && y+iy<originalSize.height)
						{
							rgb=original[(x+ix)+(y+iy)*originalSize.width];
							a+=(int)((a0-((rgb>>24) & 0xff))*strength);
							r+=(int)((r0-((rgb>>16) & 0xff))*strength);
							g+=(int)((g0-((rgb>> 8) & 0xff))*strength);
							b+=(int)((b0-((rgb>> 0) & 0xff))*strength);
						}
					}
				}
				a=Math.min(Math.max(a,0),255);
				r=Math.min(Math.max(r,0),255);
				g=Math.min(Math.max(g,0),255);
				b=Math.min(Math.max(b,0),255);
				p[x]=(a<<24) | (r<<16) | (g<<8) | (b<<0);
			}
			consumer.setPixels(0,y,originalSize.width,1,defaultRGB,
			                   p,0,originalSize.width);
		}
	}

	public void setHints(int hint)
	{
		consumer.setHints(TOPDOWNLEFTRIGHT | COMPLETESCANLINES |
		                  SINGLEPASS | (hint & SINGLEFRAME));
	}

	/*   ---   文字列化   ---   */

	public String toString()
	{
		return getClass().getName()+"[strength="+strength+"]";
	}
}