关机对话框【屏幕变暗】

创建一个关机对话框的模拟效果，同时在显示对话框之前将整个屏幕变暗为灰度图像。

关机对话框【屏幕变暗】.ahk

; https://www.autohotkey.com/boards/viewtopic.php?f=6&t=81268
; 屏幕变暗有效，但是弹不出关机对话框【或者说关机对话框没置顶】
#NoEnv
#SingleInstance, Force

F1::ShutdownDialog("Restart")


ShutdownDialog(ChooseString:="") {
  Local
  hBM := FsGrayscale(X,Y,,,W,H)
  hFG := DllCall("CreateBitmap", "Int",1, "Int",1, "Int",1, "Int",32, "PtrP",0x79000000, "Ptr")
  Gui, New, +AlwaysOnTop +ToolWindow -Caption +E0x8000000 hwndhGui +LastFound
  Gui, Margin, 0, 0
  Gui, Add, Picture,, HBITMAP:%hBM%
  Gui, Add, Picture,xp yp wp hp BackgroundTrans, HBITMAP:%hFG%
  Gui, Show, x%X% y%Y% w%W% h%H% Hide
  DllCall("AnimateWindow", "Ptr", hGui, "Int", 500, "Int", 0xA0000)
  ; ComObjCreate("Shell.Application").ShutdownWindows()
  ; WinWait, Shut Down Windows
  ; Control, ChooseString, %ChooseString%, ComboBox1
  ; WinSet, AlwaysOnTop, 1
  ; WinWaitClose
  Gui, %hGui%:Destroy
}

; 以下函数将整个屏幕捕获为灰度gdi位图。
FsGrayscale(ByRef X1:=0, ByRef Y1:=0, ByRef X2:=0, ByRef Y2:=0, ByRef W:=0, ByRef H:=0) {
  Local ; Fullscreen grayscale capture.      Original: ToGrayscale() @ tiny.cc/tograyscale
  VarSetCapacity(WININFO,62), NumPut(62,WININFO,"Int"), PW:=&WININFO
  DllCall("GetWindowInfo", "Ptr",hWnd:=DllCall("GetDesktopWindow", "Ptr"), "Ptr",&WININFO)
  Loop, Parse, % "X1.Y1.X2.Y2.W.H",.
    %A_LoopField% := (A_Index<5 ? NumGet(PW+0,A_Index*4,"Int") : A_Index=5 ? X2-X1 : Y2-Y1)

  tBM := DllCall( "CopyImage", "Ptr"
       , DllCall( "CreateBitmap", "Int",1, "Int",1, "Int",0x1, "Int",8, "Ptr",0, "Ptr")
       , "Int",0, "Int",W, "Int",H, "Int",0x2008, "Ptr")

  tDC := DllCall("CreateCompatibleDC", "Ptr",0, "Ptr")
  DllCall("DeleteObject", "Ptr",DllCall("SelectObject", "Ptr",tDC, "Ptr",tBM, "Ptr"))
  Loop % (255, n:=0x000000, VarSetCapacity(RGBQUAD256,256*4,0))
    Numput(n+=0x010101, RGBQUAD256, A_Index*4, "Int")
  DllCall("SetDIBColorTable", "Ptr",tDC, "Int",0, "Int",256, "Ptr",&RGBQUAD256)

  sDC := DllCall("GetDC", "Ptr",hWnd, "Ptr")
  DllCall("BitBlt", "Ptr",tDC, "Int",0,  "Int",0,  "Int",W, "Int",H
                  , "Ptr",sDC, "Int",X1, "Int",Y1, "Int",0x00CC0020)

  Return (tBM, DllCall("ReleaseDC", "Ptr",hWnd, "Ptr",sDC),  DllCall("DeleteDC", "Ptr",tDC))
}