WinRegion

return
~t::
 zKeyT:= 1
return
~t Up::
 zKeyT:= 0
return

~8::
 if(zKey8=1)
  return
 zKey8:= 1
 
 if(zKeyT=0)
  return

 CoordMode, Mouse, Screen
 CoordMode, Tooltip, Screen

;setting...
 MouseGetPos, mX, mY
 wx1:=mX
 wy1:=mY
 tooltip,top-left %mX% %mY%`nAwaiting 't' (bottom-right)..., mX,mY,2

 keywait, t
 tooltip
 MouseGetPos, mX, mY

 ;if same position.. restore the window..
 if(wx1=mX)
 {
  WinSet, Region,, A
  DllCall("dwmapi\DwmSetWindowAttribute", "ptr", WinExist("A")
    , "uint", DWMWA_NCRENDERING_POLICY := 2, "int*", DWMNCRP_ENABLED := 2, "uint", 4)
  tooltip,,,,2
  exit
 }
 if(wy1=mY)
 {
  WinSet, Region,, A
  DllCall("dwmapi\DwmSetWindowAttribute", "ptr", WinExist("A")
    , "uint", DWMWA_NCRENDERING_POLICY := 2, "int*", DWMNCRP_ENABLED := 2, "uint", 4)
  tooltip,,,,2
  exit
 }

 wx2:=mX
 wy2:=mY
 tooltip,bottom-right %mX% %mY%, mX,mY,3

 WinGetPos, wx3, wy3,,,A
 MouseGetPos, mX, mY
 xPosition:=mX-wx1-(wx2/2)
 yPosition:=mY-wy1-(wy2/2)

 wx2:=wx2-wx1 ;width
 wy2:=wy2-wy1 ;height
 wx1:=wx1-wx3 ;regionalize
 wy1:=wy1-wy3 ;regionalize

 ;WinSet, SubCommand, Value [, WinTitle, WinText, ExcludeTitle, ExcludeText]

 DllCall("dwmapi\DwmSetWindowAttribute", "ptr", WinExist("A")
   , "uint", DWMWA_NCRENDERING_POLICY := 2, "int*", DWMNCRP_DISABLED := 1, "uint", 4)
 WinSet, Region, %wx1%-%wy1% W%wx2% H%wy2%, A
 tooltip,,,,2
 tooltip,,,,3
return
~8 Up::
 zKey8:= 0
return