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

		public static unsafe ColorBgra GetBilinearSampleClamped (ISurface src, float x, float y)
		{
			if (!Utility.IsNumber (x) || !Utility.IsNumber (y))
				return ColorBgra.Transparent;

			float u = x;
			float v = y;

			if (u < 0)
				u = 0;
			else if (u > src.Width - 1)
				u = src.Width - 1;

			if (v < 0)
				v = 0;
			else if (v > src.Height - 1)
				v = src.Height - 1;

			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;
				int sy = iv;
				int sleft = sx;
				int sright;

				if (sleft == (src.Width - 1))
					sright = sleft;
				else
					sright = sleft + 1;

				int stop = sy;
				int sbottom;

				if (stop == (src.Height - 1))
					sbottom = stop;
				else
					sbottom = stop + 1;

				ColorBgra* cul = src.GetPointAddress (sleft, stop);
				ColorBgra* cur = cul + (sright - sleft);
				ColorBgra* cll = src.GetPointAddress (sleft, sbottom);
				ColorBgra* clr = cll + (sright - sleft);

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