/// <summary>
/// Begin editing an image.
/// </summary>
public static byte[] Begin(Bitmap bitmap, ImageLockMode lockMode, out BitmapData bmpData)
{
// Lock full image
Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
// Lock the bitmap's bits while we change them.
bmpData = bitmap.LockBits(rect, lockMode, bitmap.PixelFormat);
// Create length with number of bytes in image
byte[] rgbValues = new byte[bmpData.GetByteCount()];
// Copy the RGB values into the array.
Marshal.Copy(bmpData.Scan0, rgbValues, 0, rgbValues.Length);
// Check if monochrome
if (bitmap.PixelFormat == PixelFormat.Format1bppIndexed)
{
// Adjust stride
bmpData.Stride *= Constants.BitsPerByte;
// Convert each bit to a separate byte
return(ImageBytes.BytesToBits(rgbValues));
}
else
{
return(rgbValues);
}
}
/// <summary>
/// Gets the bytes from a bitmap image (image portion only).
/// </summary>
/// <param name="bitmap">Bitmap to get bytes from</param>
/// <param name="bmpData">Data relating to bitmap</param>
/// <returns>Image bytes</returns>
private static byte[] GetBitmapBytes(Bitmap bitmap, out BitmapData bmpData)
{
// Lock full image
Rectangle rect = new Rectangle(0, 0, bitmap.Width, bitmap.Height);
// Lock the bits while we read them.
bmpData = bitmap.LockBits(rect, ImageLockMode.ReadOnly, bitmap.PixelFormat);
// Create length with number of bytes in image
byte[] rgbValues = new byte[bmpData.GetByteCount()];
// Copy the RGB values into the array.
Marshal.Copy(bmpData.Scan0, rgbValues, 0, rgbValues.Length);
// Check if monochrome
if (bitmap.PixelFormat == PixelFormat.Format1bppIndexed)
{
// Adjust stride
bmpData.Stride *= Constants.BitsPerByte;
// Convert each bit to a separate byte
rgbValues = BytesToBits(rgbValues).Select(b => b > 0 ? byte.MaxValue : byte.MinValue).ToArray();
}
// Unlock the bits.
bitmap.UnlockBits(bmpData);
return(rgbValues);
}