public Bitmap Screen(ref Rectangle bounds, CaptureMode captureMode, ScreenDisplayItem screen = null)
{
// Capture a new screenshot.
//
if (captureMode == CaptureMode.AllScreens)
{
_newBitmap = CaptureScreen.CaptureAllScreens();
}
else if (captureMode == CaptureMode.ActiveScreen)
{
_newBitmap = CaptureScreen.CaptureDesktopWithCursor();
}
else if (captureMode == CaptureMode.SpecificScreen)
{
_newBitmap = CaptureScreen.CaptureSpecificScreen(screen);
}
if (_newBitmap == null)
{
_newBitmap = new Bitmap(10, 10);
}
// If we have a previous screenshot, only send back
// a subset that is the minimum rectangular area
// that encompasses all the changed pixels.
//
if (_prevBitmap != null)
{
// Get the bounding box.
//
bounds = GetBoundingBoxForChanges();
if (bounds == Rectangle.Empty)
{
// Nothing has changed.
//
return(null);
}
// Get the minimum rectangular area
//
var diff = new Bitmap(bounds.Width, bounds.Height);
var g = Graphics.FromImage(diff);
g.DrawImage(_newBitmap, 0, 0, bounds, GraphicsUnit.Pixel);
g.Dispose();
// Set the current bitmap as the previous to prepare
// for the next screen capture.
//
_prevBitmap = _newBitmap;
return(diff);
}
// We don't have a previous screen capture. Therefore
// we need to send back the whole screen this time.
//
// Set the previous bitmap to the current to prepare
// for the next screen capture.
//
_prevBitmap = _newBitmap;
// Create a bounding rectangle.
//
bounds = new Rectangle(0, 0, _newBitmap.Width, _newBitmap.Height);
return(_newBitmap);
}
public List <ScreenDisplayItem> LoadScreens()
{
return(CaptureScreen.LoadScreens());
}
