Pinta.ImageManipulation.Utility.GetBilinearSampleWrapped C# (CSharp) Method

		public static unsafe ColorBgra GetBilinearSampleWrapped (ISurface src, ColorBgra* srcDataPtr, int srcWidth, int srcHeight, float x, float y)
		{
			if (!Utility.IsNumber (x) || !Utility.IsNumber (y))
				return ColorBgra.Transparent;

			float u = x;
			float v = y;

			unchecked {
				int iu = (int)Math.Floor (u);
				uint sxfrac = (uint)(256 * (u - (float)iu));
				uint sxfracinv = 256 - sxfrac;

				int iv = (int)Math.Floor (v);
				uint syfrac = (uint)(256 * (v - (float)iv));
				uint syfracinv = 256 - syfrac;

				uint wul = (uint)(sxfracinv * syfracinv);
				uint wur = (uint)(sxfrac * syfracinv);
				uint wll = (uint)(sxfracinv * syfrac);
				uint wlr = (uint)(sxfrac * syfrac);

				int sx = iu;
				if (sx < 0)
					sx = (srcWidth - 1) + ((sx + 1) % srcWidth);
				else if (sx > (srcWidth - 1))
					sx = sx % srcWidth;

				int sy = iv;
				if (sy < 0)
					sy = (srcHeight - 1) + ((sy + 1) % srcHeight);
				else if (sy > (srcHeight - 1))
					sy = sy % srcHeight;

				int sleft = sx;
				int sright;

				if (sleft == (srcWidth - 1))
					sright = 0;
				else
					sright = sleft + 1;

				int stop = sy;
				int sbottom;

				if (stop == (srcHeight - 1))
					sbottom = 0;
				else
					sbottom = stop + 1;

				ColorBgra cul = src.GetPoint (sleft, stop);
				ColorBgra cur = src.GetPoint (sright, stop);
				ColorBgra cll = src.GetPoint (sleft, sbottom);
				ColorBgra clr = src.GetPoint (sright, sbottom);

				ColorBgra c = ColorBgra.BlendColors4W16IP (cul, wul, cur, wur, cll, wll, clr, wlr);

				return c;
			}
		}