PathfindingTest.Map.MiniMap.MergeTextures C# (CSharp) Method

        public Texture2D MergeTextures(Texture2D[,] toMerge)
        {
            int targetWidth = 0;
            int targetHeight = 0;

            // Check if we can merge the new texture; if the sizes aren't equal, we cant do it, for now
            foreach (Texture2D tex in toMerge)
            {
                if (toMerge[0, 0].Width != tex.Width || toMerge[0, 0].Height != tex.Height)
                {
                    throw new Exception("Texture sizes aren't equal; cannot merge!");
                }
            }

            int textureWidth = toMerge[0, 0].Width;
            int textureHeight = toMerge[0, 0].Height;

            targetWidth = toMerge[0, 0].Width * toMerge.GetLength(0);
            targetHeight = toMerge[0, 0].Height * toMerge.GetLength(1);

            int[] result = new int[targetWidth * targetHeight];
            for (int i = 0; i < toMerge.GetLength(0); i++)
            {
                for (int j = 0; j < toMerge.GetLength(1); j++)
                {
                    int[] tempData = new int[toMerge[i, j].Width * toMerge[i, j].Height];
                    toMerge[i, j].GetData(tempData);

                    for (int k = 0; k < tempData.Length; k++)
                    {
                        // if tempData[k] == 0, it will bring row from -1 to 0
                        int xoffset = k % textureWidth;
                        int startPoint = (j * toMerge[i, j].Height * targetWidth) + i * toMerge[i, j].Width;
                        int yoffset = (k / textureWidth) * targetWidth;

                        result[startPoint + xoffset + yoffset] = tempData[k];
                    }
                    if (onLoadTickListeners != null) onLoadTickListeners(this);
                }
            }

            Texture2D resultTex = new Texture2D(Game1.GetInstance().graphics.GraphicsDevice, targetWidth, targetHeight);
            resultTex.SetData(result);
            return resultTex;
        }