SetTimer, CheckIdle, 250
return

CheckIdle:
if WinActive("ahk_class RE_BHD")              
{
                 SystemCursor("Off")
                 MouseMove, 0, 0
                 BlockInput, MouseMove
                    
}
else
{
                 SystemCursor("On")
                 BlockInput, MouseMoveOff
}
return

#IfWinNotActive ahk_class RE_BHD   ; Shortcut alt+C kills the app, if not ingame
!c::ExitApp

#Persistent
OnExit, ShowCursor  ; Ensure the cursor is made visible when the script exits.
return

ShowCursor:
SystemCursor("On")
ExitApp

SystemCursor(OnOff=1)   ; INIT = "I","Init"; OFF = 0,"Off"; TOGGLE = -1,"T","Toggle"; ON = others
{
                 static AndMask, XorMask, $, h_cursor
                     ,c0,c1,c2,c3,c4,c5,c6,c7,c8,c9,c10,c11,c12,c13 ; system cursors
                     , b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13   ; blank cursors
                     , h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11,h12,h13   ; handles of default cursors
                 if (OnOff = "Init" or OnOff = "I" or $ = "")       ; init when requested or at first call
                 {
                     $ = h                    ; active default cursors
                     VarSetCapacity( h_cursor,4444, 1 )
                     VarSetCapacity( AndMask, 32*4, 0xFF )
                     VarSetCapacity( XorMask, 32*4, 0 )
                     system_cursors = 32512,32513,32514,32515,32516,32642,32643,32644,32645,32646,32648,32649,32650
                     StringSplit c, system_cursors, `,
                     Loop %c0%
                     {
                         h_cursor   := DllCall( "LoadCursor", "uint",0, "uint",c%A_Index% )
                         h%A_Index% := DllCall( "CopyImage",  "uint",h_cursor, "uint",2, "int",0, "int",0, "uint",0 )
                         b%A_Index% := DllCall("CreateCursor","uint",0, "int",0, "int",0
                             , "int",32, "int",32, "uint",&AndMask, "uint",&XorMask )
                     }
                 }
                 if (OnOff = 0 or OnOff = "Off" or $ = "h" and (OnOff < 0 or OnOff = "Toggle" or OnOff = "T"))
                     $ = b  ; use blank cursors
                 else
                     $ = h  ; use the saved cursors

                 Loop %c0%
                 {
                     h_cursor := DllCall( "CopyImage", "uint",%$%%A_Index%, "uint",2, "int",0, "int",0, "uint",0 )
                     DllCall( "SetSystemCursor", "uint",h_cursor, "uint",c%A_Index% )
                 }
}