/// <summary>
/// Creates an <see cref="EditableBitmap"/> as a view on a section of an existing <see cref="EditableBitmap"/>.
/// </summary>
/// <param name="source"></param>
/// <param name="viewArea"></param>
protected EditableBitmap(EditableBitmap source, Rectangle viewArea)
{
owner = source;
pixelFormatSize = source.pixelFormatSize;
byteArray = source.byteArray;
byteArray.AddReference();
stride = source.stride;
try
{
startOffset = source.startOffset + (stride * viewArea.Y) + (viewArea.X * pixelFormatSize);
bitmap = new Bitmap(viewArea.Width, viewArea.Height, stride, source.Bitmap.PixelFormat,
(IntPtr)(((int)byteArray.bitPtr) + startOffset));
}
finally
{
if (bitmap == null)
{
byteArray.ReleaseReference();
}
}
}