/// <summary>
/// Creates a bitmap from a filestream.
/// </summary>
/// <param name="reader">The System.IO.BinaryReader to use.</param>
/// <param name="amount">The size in bytes of the image.</param>
/// <returns>A new bitmap object.</returns>
public Bitmap LoadFromStream(BinaryReader reader, int amount)
{
byte[] bmpBytes = reader.ReadBytes(amount);
Marshal.Copy(bmpBytes, 0, _data.Scan0, amount);
_fastImg.LockImage();
unsafe
{
byte *ptr = (byte *)_data.Scan0;
for (int y = 0; y < _copy.Height; ++y)
{
for (int x = 0; x < _copy.Width; ++x)
{
int value = *(ptr);
_fastImg.SetPixel(x, y, Color.FromArgb(*(ptr + 3), value, *(ptr + 1), *(ptr + 2)));
ptr += 4;
}
}
}
_fastImg.UnlockImage();
return(new Bitmap(_image));
}
/// <summary>
/// Draws another bitmap into this image using straight-up pixel data.
/// Not as fast as the Graphics.DrawImage();
/// </summary>
/// <param name="img">The source image.</param>
/// <param name="x">x location in pixels.</param>
/// <param name="y">y location in pixels.</param>
public void DrawImage(Bitmap img, int x, int y)
{
FastBitmap fastSource = new FastBitmap(img);
fastSource.LockImage();
for (int y0 = y; y0 < _image.Height; ++y0)
{
if (y0 == Height)
{
continue;
}
for (int x0 = x; x0 < _image.Width; ++x0)
{
if (x0 == Width)
{
continue;
}
SetPixel(x0, y0, fastSource.GetPixel(x0 - x, y0 - y));
}
}
fastSource.UnlockImage();
}