public FastBitmap(string filename)
{
if (string.IsNullOrEmpty(filename))
{
throw new ArgumentNullException(nameof(filename));
}
var bmp = BitmapFileFormat.FromFile(filename);
if (!bmp.IsValid)
{
throw new ImagingException("Invalid File Format! " + filename);
}
if (bmp.IsUpsideDown)
{
bmp.ReverseScanLines();
}
byte[] bytes = bmp.GetBytes();
_bitmapInfoHeader = Marshal.AllocHGlobal(bytes.Length);
_dibSection = _bitmapInfoHeader + (int)bmp.PixelArrayOffset;
_pixels = (byte *)_dibSection.ToPointer();
Marshal.Copy(bytes, 0, _bitmapInfoHeader, bytes.Length);
Width = bmp.ImageWidth;
Height = Math.Abs(bmp.ImageHeight);
Stride = (((bmp.ImageWidth * bmp.BitsPerPixel) + 31) / 32) * 4;
}
static void Main(string[] args)
{
var bmp = BitmapFileFormat.FromFile("red.bmp");
bmp.ReverseScanLines();
bmp.Save("other.bmp");
//using (var bmp = new FastBitmap("red.bmp"))
//{
// Console.WriteLine(bmp.GetPixel(5, 5).Compare(new Pixel(0,0,0)));
// Console.WriteLine(bmp.GetPixel(9, 6).ToString());
// Console.WriteLine(bmp.GetPixel(2, 9).ToString());
// Console.WriteLine(bmp.GetPixel(3, 4).ToString());
//}
//Console.ReadLine();
}
