#NoEnv
#NoTrayIcon
#MaxHotkeysPerInterval, 1000

CoordMode, Mouse
OnMessage(WM_LBUTTONDOWN:=0x201, "WndProc"), OnMessage(AHK_NOTIFYICON:=0x404, "WndProc")
LR_DEFAULTSIZE:=0x40, CAPTUREBLT:=0x40000000, MERGECOPY:=0xC000CA, iconHex:=`"
(Join
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)`"
tSize:=A_PtrSize=4 ? A_IsUnicode ? 956:508:976
NumPut(VarSetCapacity(NOTIFYICONDATA, tSize, 0), NOTIFYICONDATA, 0)
VarSetCapacity(iconData, nSize:=StrLen(iconHex)//2)
Loop, % nSize
   NumPut("0x"SubStr(iconHex, 2*A_Index-1, 2), iconData, A_Index-1, "UChar")
hIcon1:=DllCall("CreateIconFromResourceEx", "Ptr", &iconData+22
                                          , "UInt", NumGet(&iconData+14)
                                          , "Int", True
                                          , "UInt", 0x30000
                                          , "Int" , 0
                                          , "Int" , 0
                                          , "UInt", LR_DEFAULTSIZE
                                          , "Ptr")
hIcon2:=DllCall("shell32\ExtractIcon"(A_IsUnicode ? "W":"A"), "Ptr", 0
                                                            , "Str", "shell32.dll"
                                                            , "Int", -23
                                                            , "Ptr")
iconHex:=iconData:=nSize:=sSize:="", tipInfo:="RCtrl+Enter - set defaults`n"
                                            . "RCtrl+Up     - dec zoom`n"
                                            . "RCtrl+Down - inc zoom`n"
                                            . "LClick(icon) - pause`n"
                                            . "Esc(hold)     - exit"
TrayIcon(A_ScriptHwnd, 1, AHK_NOTIFYICON, hIcon2, tipInfo, 0)

Gui, +AlwaysOnTop -Caption +Resize +ToolWindow HWNDhWnd_
Gui, Show, % "w155 h"value_:=width:=155, % "Magnifier"
WinGetPos, xWnd, yWnd,,, % "ahk_id"hWnd_
hDC1:=DllCall("GetDC", "Ptr", hWnd_, "Ptr")
hDC2:=DllCall("GetDC", "Ptr", DllCall("GetDesktopWindow", "Ptr"), "Ptr")
SetTimer, % "ChaseCursor", 100

Hotkey, RCtrl & Enter, % "HotkeyAction"
Hotkey, RCtrl & Up, % "HotkeyAction"
Hotkey, RCtrl & Down, % "HotkeyAction"

Menu, Tray, NoStandard
Menu, Tray, Add, % "Keep &zoom", % "ZoomMenu"
Menu, Tray, Check, % "Keep &zoom"
Menu, Tray, Add, % "Keep &aspect ratio", % "AspectMenu"
Menu, Tray, Check, % "Keep &aspect ratio"
Menu, Tray, Add
Menu, Tray, Add, % "&Exit", % "ExitScript"

~Esc::
   While, GetKeyState(SubStr(A_ThisHotkey, 2), "P")
   {
      Sleep, 50
      If A_TimeSinceThisHotkey>500
      {
         KeyWait, % SubStr(A_ThisHotkey, 2)
         Goto, ExitScript
      }
   }
   Return

HotkeyAction:
   If SubStr(A_ThisHotkey, 9)="Enter"
      SetDefault()
   Else If SubStr(A_ThisHotkey, 9)="Down"
      value_-=5, value_<0 ? value_:=1:value_
   Else value_+=5
   Return

Guisize:
   If reset
   {
      reset:=False
      Return
   }
   If % A_EventInfo=0
   {
      If !isNotKeepZ
      {
         value_*=A_Guiwidth/width
         If (Mod(value_, 2)=0)
            value_+=1
      }
      width:=A_Guiwidth, height:=A_Guiheight
      WinMove, % "ahk_id"hWnd_,,,, width, isNotKeepAR ? height:width
   }
   Return

ChaseCursor:
   MouseGetPos, xPos, yPos
   DllCall("gdi32\StretchBlt", "Ptr", hDC1
                             , "Int" , 0
                             , "Int" , 0
                             , "Int" , width
                             , "Int" , isNotKeepAR ? height:width
                             , "Ptr", hDC2
                             , "Int" , xPos-(value_/2)
                             , "Int" , yPos-(value_/2)
                             , "Int" , value_
                             , "Int" , value_
                             , "UInt", CAPTUREBLT|MERGECOPY)
   Return

ZoomMenu:
AspectMenu:
   If isPaused
   {
      MsgBox, 262208, % A_Space, % "Without result while on a pause.", % 1.5
      Return
   }
   Menu, Tray, % (A_ThisLabel~="mM" ? (isNotKeepZ:=!isNotKeepZ) ? "Unc":"C"
                               . "" : (isNotKeepAR:=!isNotKeepAR) ? "Unc":"C")"heck"
             , % "Keep &"(A_ThisLabel~="mM" ? "zoom":"aspect ratio")
   If % A_ThisLabel~="tM"
      SetDefault()
   Return

ExitScript:
   Loop, 2
      DllCall("DestroyIcon", "Ptr", hIcon%A_Index%), DllCall("ReleaseDC", "Ptr", 0
                                                                        , "Ptr", hDC%A_Index%)
   ExitApp

SetDefault()
{
   Global

   reset:=True, value_:=width:=height:=155
   WinMove, % "ahk_id"hWnd_,, xWnd, yWnd, 155, 155
}

WndProc(aParams*)
{
   Global hIcon1, hIcon2, tipInfo, isPaused, WM_LBUTTONDOWN, AHK_NOTIFYICON

   If aParams.3=WM_LBUTTONDOWN
      PostMessage, WM_NCLBUTTONDOWN:=0xA1, HTCAPTION:=2,,, % "ahk_id"aParams.4
   Else If aParams.2=WM_LBUTTONUP:=0x202
   {
      Gui, % (isPaused:=!isPaused) ? "Cancel":"Show"
      TrayIcon(A_ScriptHwnd, 1, AHK_NOTIFYICON, isPaused ? hIcon1:hIcon2, tipInfo, 1)
      Hotkey, RCtrl & Enter, % "HotkeyAction", % isPaused ? "Off":"On"
      Hotkey, RCtrl & Up, % "HotkeyAction", % isPaused ? "Off":"On"
      Hotkey, RCtrl & Down, % "HotkeyAction", % isPaused ? "Off":"On"
      SetTimer, % "ChaseCursor", % isPaused ? "Off":100
   }
}

TrayIcon(handleWnd, uID, uCbMsg:=0, hIcon:=0, szTip:="", dwMsg:=2)
{
   Global NOTIFYICONDATA

   NumPut(handleWnd, NOTIFYICONDATA,  A_PtrSize=4 ? 04:08, "Ptr")
   NumPut(uID      , NOTIFYICONDATA,  A_PtrSize=4 ? 08:16, "UInt")
   NumPut(1|2|4    , NOTIFYICONDATA,  A_PtrSize=4 ? 12:20, "UInt")
   NumPut(uCbMsg   , NOTIFYICONDATA,  A_PtrSize=4 ? 16:24, "UInt")
   NumPut(hIcon    , NOTIFYICONDATA,  A_PtrSize=4 ? 20:32, "Ptr")
   StrPut(szTip    ,&NOTIFYICONDATA +(A_PtrSize=4 ? 24:40), 141, A_IsUnicode ? "UTF-16":"")
   NumPut(1|2      , NOTIFYICONDATA,  A_PtrSize=4 ? A_IsUnicode ? 800:416:816, "UInt")
   DllCall("shell32\Shell_NotifyIcon"(A_IsUnicode ? "W":"A"), "UInt", dwMsg
                                                            , "Ptr", &NOTIFYICONDATA)
}

Тема для обсуждения на форуме.