using UnityEngine;

public static class Texture2DExpansion
{
	public static Texture2D Blur(this Texture2D image, int blurSize)
	{
        	Texture2D blurred = new Texture2D(image.width, image.height);
       		// foreach pixel
		for (int xx = 0; xx < image.width; xx++)
        	{
            		for (int yy = 0; yy < image.height; yy++)
            		{
                		float avgR = 0, avgG = 0, avgB = 0, avgA = 0;
                		int blurPixelCount = 0;
                		// average the color
                		for (int x = xx; (x < xx + blurSize && x < image.width); x++)
                		{
                    			for (int y = yy; (y < yy + blurSize && y < image.height); y++)
                    			{
                        			Color pixel = image.GetPixel(x, y);
                        			avgR += pixel.r;
                        			avgG += pixel.g;
                        			avgB += pixel.b;
                        			avgA += pixel.a;
                        			blurPixelCount++;
                    			}
                		}
                		avgR = avgR / blurPixelCount;
                		avgG = avgG / blurPixelCount;
                		avgB = avgB / blurPixelCount;
				avgA = avgA / blurPixelCount;
				// after averaging, set pixel to that color

                		for (int x = xx; x < xx + blurSize && x < image.width; x++)
				{
                    			for (int y = yy; y < yy + blurSize && y < image.height; y++)
		    			{
                       				blurred.SetPixel(x, y, new Color(avgR, avgG, avgB, avgA));
		    			}
				}
           		}
        	}
       		blurred.Apply();
        	return blurred;
   	}
}