Unity Texture2D生成缩略图

public Texture2D ScaleTexture(Texture2D source, int targetWidth, int targetHeight)
        {
            Texture2D result = new Texture2D(targetWidth, targetHeight, source.format, false);

            for (int i = 0; i < result.height; ++i)
            {
                for (int j = 0; j < result.width; ++j)
                {
                    Color newColor = source.GetPixelBilinear((float)j / (float)result.width, (float)i / (float)result.height);
                    result.SetPixel(j, i, newColor);
                }
            }

            result.Apply();
            return result;
        }