[ahk]Screen Magnifier (屏幕放大镜) — 作者: Holomind

这个屏幕放大镜比操作系统自带的那个有好多优点, 包括: 可自定义的刷新间隔和放大倍数 (包括缩小/反放大); 抗锯齿从而提供更高质的输出; 并且它是开源的 (因此, 有很多变体可供选择, 或者您可以自己对脚本进行调整).

完整版

OnExit handle_exit

  Gui,  +AlwaysOnTop  +Owner +Resize +ToolWindow ; window for the dock
  Gui, Show, NoActivate w400 h400 x300 y50 , PrintScreen
  Gui, Add, DDL, vzoom   , 0.5|1|2||4|8|16 
  Gui, Add, Checkbox, y12 x150 vantialize, Antialize ?
  Gui, Add, Slider, vdelay x220 y0  Range15-200
  Gui, Add, Text, x340 y12 w80  vdelay2

  WinGet PrintScreenID, id  ,PrintScreen  ; 
  WinSet, Transparent , 254, PrintScreen

  ;retrieve the unique ID number (HWND/handle) of that window
  WinGet, PrintSourceID, id 

  hotkey , #x           , toggle_follow
  hotkey , +$LButton    , click_through

  toolbar_def:=35
  toolbar := toolbar_def
  follow :=0

  hdd_frame := DllCall( "GetDC", UInt, PrintSourceID )
  hdc_frame := DllCall( "GetDC", UInt, PrintScreenID )

  hdc_buffer := DllCall("gdi32.dll\CreateCompatibleDC", UInt,  hdc_frame)  ; buffer
  hbm_buffer := DllCall("gdi32.dll\CreateCompatibleBitmap", UInt,hdc_frame, Int,A_ScreenWidth, Int,A_ScreenHeight)
  
  Gosub, Repaint
return 

toggle_follow: 
    follow := 1 - follow
  
    if follow = 1 
    {
        WinSet Region, 0-0  W%ww% H%wh% E  , PrintScreen
        toolbar := -32 ; height of window title
        GuiControl, Hide, zoom
    }
    else
    {
        WinSet Region,, PrintScreen
        toolbar :=toolbar_def
        GuiControl, Show, zoom
    }
Return

click_through:
    if follow = 1
    {
      Gui, Hide
      Send, {Click}
      SetTimer, Repaint , Off
      Sleep, 100
      Gui, Show
      SetTimer, Repaint, %delay%
    }
Return

Repaint: 

   CoordMode, Mouse, Screen                
   MouseGetPos, start_x, start_y             ;  position of mouse
   Gui, Submit, NoHide                       ; needed to read the dropdown and slidervalue
   GuiControl,, delay2 , delay %delay% ms
   WinGetPos, wx, wy, ww, wh , PrintScreen

   wh2 := wh - toolbar

    DllCall( "gdi32.dll\SetStretchBltMode", "uint", hdc_frame, "int", 4 * antialize )  ; Halftone better quality with stretch
   
    DllCall("gdi32.dll\StretchBlt", UInt,hdc_frame, Int,0, Int,toolbar, Int,ww, Int,wh - toolbar
          , UInt,hdd_frame, Int
          , start_x-(ww / 2 / zoom)
          , Int,start_y -( wh2 / 2/zoom), Int,ww / zoom, Int,wh2 / zoom ,UInt,0xCC0020) ; SRCCOPY

   if follow = 1
     WinMove, PrintScreen, ,start_x -ww/2 , start_y-wh/2 
   
  SetTimer, Repaint , %delay% 
Return

GuiClose:
handle_exit:
   DllCall("gdi32.dll\DeleteObject", UInt,hbm_buffer)
   DllCall("gdi32.dll\DeleteDC", UInt,hdc_frame )
   DllCall("gdi32.dll\DeleteDC", UInt,hdd_frame )
   DllCall("gdi32.dll\DeleteDC", UInt,hdc_buffer)
ExitApp

gui简化版

#NoEnv
SetBatchLines -1

CoordMode Mouse, Screen
OnExit GuiClose
zoom = 2                ; initial magnification, 1..32
antialize = 0
Rx = 128                ; half vertical/horizontal side of magnifier window
Ry = 128
Zx := Rx/zoom           ; frame x/y size
Zy := Ry/zoom
                        ; GUI to show the magnified image
Gui +AlwaysOnTop +Resize +ToolWindow
Gui Show, % "w" 2*Rx " h" 2*Ry " x0 y0", Magnifier
WinGet MagnifierID, id,  Magnifier
WinSet Transparent, 255, Magnifier ; makes the window invisible to magnification
WinGet PrintSourceID, ID

hdd_frame := DllCall("GetDC", UInt, PrintSourceID)
hdc_frame := DllCall("GetDC", UInt, MagnifierID)

SetTimer Repaint, 50    ; flow through

Repaint:
   MouseGetPos x, y
   xz := In(x-Zx-6,0,A_ScreenWidth-2*Zx) ; keep the frame on screen
   yz := In(y-Zy-6,0,A_ScreenHeight-2*Zy)
  ; WinMove Frame,,%xz%, %yz%, % 2*Zx, % 2*Zy
   DllCall("gdi32.dll\StretchBlt", UInt,hdc_frame, Int,0, Int,0, Int,2*Rx, Int,2*Ry
   , UInt,hdd_frame, UInt,xz, UInt,yz, Int,2*Zx, Int,2*Zy, UInt,0xCC0020) ; SRCCOPY
Return


GuiSize:
   Rx := A_GuiWidth/2
   Ry := A_GuiHeight/2
   Zx := Rx/zoom
   Zy := Ry/zoom
   TrayTip,,% "Frame  =  " Round(2*Zx) " × " Round(2*Zy) "`nMagnified to = " A_GuiWidth "×" A_GuiHeight
Return

#a::
  antialize := !antialize
  DllCall( "gdi32.dll\SetStretchBltMode", "uint", hdc_frame, "int", 4*antialize )  ; Antializing ?
Return 

#x::
GuiClose:
   DllCall("gdi32.dll\DeleteDC", UInt,hdc_frame )
   DllCall("gdi32.dll\DeleteDC", UInt,hdd_frame )
ExitApp

#p::
MButton::
   if paused = 
   {
        Gui, 2:Hide 
        Gui, Hide 
        SetTimer, Repaint, Off
        paused = 1
   }
   else
   {
        Gui, 2:Show 
        Gui, Show 
        SetTimer, Repaint, 50
        paused =
   }
Return

^+Up::
^+Down::
^+WheelUp::                      ; Ctrl+Shift+WheelUp to zoom in
^+WheelDown::                    ; Ctrl+Shift+WheelUp to zoom out
   If (zoom < 31 and ( A_ThisHotKey = "^+WheelUp" or A_ThisHotKey = "^+Up" ))
      zoom *= 1.189207115         ; sqrt(sqrt(2))
   If (zoom >  1 and ( A_ThisHotKey = "^+WheelDown" or A_ThisHotKey = "^+Down" ))
      zoom /= 1.189207115
   Zx := Rx/zoom
   Zy := Ry/zoom
   TrayTip,,% "Zoom = " Round(100*zoom) "%"
Return

In(x,a,b) {                      ; closest number to x in [a,b]
   IfLess x,%a%, Return a
   IfLess b,%x%, Return b
   Return x
}