I'm having multiple threads that need to READ the same bitmap. They all need to potentially read the entire bitmap.
I want them to access the underlying bytes, so each thread invokes LockBits with ReadOnly lockmode.
BitmapData bits = videoEntry.Data.LockBits(new System.Drawing.Rectangle(0, 0, width, height), ImageLockMode.ReadOnly, PixelFormat.Format32bppRgb);
var bytes = new byte[width * height * 4];
Marshal.Copy(bits.Scan0, bytes, 0, bytes.Length);
videoEntry.Data.UnlockBits(bits);
DoSomethingThreadSpecificWithByteArray(bytes, 0, bytes.Length);
Unfortunately, two consecutive calls to LockBits throws an exception System.InvalidOperationException: 'Bitmap region is already locked.' Which kind of makes sense, although I only want to read the memory.
My questions:
Is there another/better way to read the bytes of a Bitmap from multiple threads?
Obviously, I can preprocess the byte array and let all threads access that, but I guess it's nice to keep the Bitmap classes together.
