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SysGet, nL, 76
SysGet, nT, 77
SysGet, nW, 78
SysGet, nH, 79

nL := nT := 0, nW := A_ScreenWidth, nH := A_ScreenHeight                        ; Get coordinates for full screen
.............................
DllCall("BitBlt", "UInt", mDC, "Int", 0, "Int", 0, "Int", nW, "Int", nH, "UInt", hDC, "Int", nL, "Int", nT, "UInt", 0x40000000|0x00CC0020)

; TextToImage v1.08 by tic
;
; TextToImage can overlay writing to a screenshot of the entire screen or active window, or from an existing image and write to file
; TextToImage(In, Text, Output, x, y, Font, TColour, Size, Weight)
;
; In: Can either be the "Screen" or "Window" and will take a screenshot of the respective choice, or the location of an exisitng image
;
; Text: This is the text to overlay onto the screenshot
;
; Output: This is the path and filename that the image will be written to.
; The extension can be .bmp,.jpg,.png,.tif,.gif and will be written as that type accordingly
;
; x: This is the x-coordinate to place the text. This coordinate will be the distance from the left the text will be placed.
; This value may be a ratio. For instance 4:5 would place the text at the position 4/5ths of the width of the image
; You must also consult which mode align is in
;
; y: This is the y-coordinate to place the text. This coordinate will be the distance from the top the text will be placed.
; This value may be a ratio. For instance 1:3 would place the text at the position 1/3ths of the height of the image
; You must also consult which mode align is in
;
; Size: This is the height of the text in pixels
;
; Align: This must have 2 styles set, The text's x placement (Left,Centre,Right) and the text's y placement (Top,Bottom)
; It must be used for example as Left|Bottom - This would place the text at the bottom of it's bounding area and aligned left
;
; Weight: This is the boldness of the text. Make the value greater to make it more bold
;
; Font: This is the font to set the text to be
; Examples are: Arial, Bookman Old Style, Times New Roman
;
; TColour: This is the colour to set the text in RGB format.
; So FF0000 is red
;
; Style: Can contain the words Underline,Italic,Strikeout and will set the text in the appropriate styles

TextToImage(In="Screen", Text="TextToImage", Output="TextToImage.bmp", x="1:2", y="1:2", Size="20", Align="Bottom|Centre", Weight="400", Font="Arial", TColour="000000", Style="")
{
    hGdiPlus := DllCall("LoadLibrary", "Str", "gdiplus.dll")
    VarSetCapacity(si, 16, 0), si := Chr(1)
    DllCall("gdiplus\GdiplusStartup", "UIntP", pToken, "UInt", &si, "UInt", 0)
   
    If In Contains Screen,Window
    {
        If (In = "Screen")
      {
         SysGet, nL, 76                                                ; Get coordinates for all monitors
         SysGet, nT, 77
         SysGet, nW, 78
         SysGet, nH, 79
      }
      Else If ((SubStr(In, 1, 6) = "Screen") && ((Substr(In, 0) & 1) != ""))
      {
         SysGet, Coords, Monitor, % Substr(In, 0)   ;%
         nL := CoordsLeft, nT := CoordsTop, nW := CoordsRight, nH := CoordsBottom
      }   
        Else If (In = "Window")
        {
            WinGetPos, nL, nT, nW, nH, A                                                ; Get coordinates for active window
            WinGet, ID, ID, A
            WinGetTitle, Title, A
            Winget, MinMax, MinMax, A
            If !(DllCall("IsWindowVisible", UInt, ID) && (Title) && (MinMax != -1))      ; Check active window is visible
            {
                GoSub, TTS_GdiplusShutdown
                Return, "Window is not visible"
            }
        }       
        mDC := DllCall("CreateCompatibleDC", "UInt", 0)
        NumPut(VarSetCapacity(bi, 40, 0), bi)
        NumPut(nW-nL, bi, 4)
        NumPut(nH-nT, bi, 8)
        NumPut(32, NumPut(1, bi, 12, "UShort"), 0, "UShort")
        hBM := DllCall("gdi32\CreateDIBSection", "UInt", mDC, "UInt", &bi, "UInt", 0, "UIntP", "", "UInt", 0, "UInt", 0)
        oBM := DllCall("SelectObject", "UInt", mDC, "UInt", hBM)                        ; Place bitmap object Into compatible DC
        hDC := DllCall("GetDC", "UInt", 0)                                             ; Get DC of screen and bitblt
      
        DllCall("BitBlt", "UInt", mDC
      , "Int", 0, "Int", 0
      , "Int", nW-nL, "Int", nH-nT
      , "UInt", hDC, "Int"
      , nL, "Int", nT
      , "UInt", 0x40000000|0x00CC0020)
    }
    Else
    {
        VarSetCapacity(wFile, StrLen(In)*2+2)
        DllCall("kernel32\MultiByteToWideChar", "UInt", 0, "UInt", 0, "UInt", &In, "Int", -1, "UInt", &wFile, "Int", VarSetCapacity(wFile)//2)
        DllCall("gdiplus\GdipCreateBitmapFromFile", "UInt", &wFile, "UIntP", pBitmap)

        If !pBitmap
        {
            Gosub, TTS_GdiplusShutdown
            Return, "Failed to load image"
        }
       
        DllCall("gdiplus\GdipCreateHBITMAPFromBitmap", "UInt", pBitmap, "UIntP", hBM, "UInt", 0)
      DllCall("gdiplus\GdipDisposeImage", "Uint", pBitmap)
        mDC := DllCall("CreateCompatibleDC", "UInt", 0)
        oBM := DllCall("SelectObject", "UInt", mDC, "UInt", hBM)
      hDC := DllCall("GetDC", "UInt", 0)
    }

    StringSplit, OutputArray, Output, .
    Extension := "." . OutputArray%OutputArray0%
    If Extension not in .bmp,.jpg,.png,.tif,.gif                                    ; Check file extension is correct
    {
        GoSub, TTS_GdiplusShutdown
        Return, "Invalid file extension. Only bmp,jpg,png,tif,gif are available"
    }

    VarSetCapacity(bm, 24, 0)
    If !DllCall("GetObject", "UInt", hBM, "Int", 24, "UInt", &bm)
    {
        GoSub, TTS_GdiplusShutdown
        Return, "GetObject failed on bitmap {" hBM "}"
    }
    Width := NumGet(bm, 4, "Int")                                                  ; Get properties of bitmap
    Height := NumGet(bm, 8, "Int")
    bpp := NumGet(bm, 18, "Ushort")
   
    DllCall("SetBkMode", "UInt", mDC, "UInt", 1)                                   ; Leave background untouched for background mix mode
    DllCall("SetGraphicsMode", "UInt", mDC, "UInt", 2)                            ; Set graphics mode for DC to allow world transformations                           

    VarSetCapacity(logfont, 60, 0)
   
    LogPixelsSY := DllCall("GetDeviceCaps", "UInt", hDC, "Int", 90)                 ; Number of pixels per logical inch along the screen height
    DllCall("ReleaseDC", "UInt", 0, "UInt", hDC)
    TextHeight := -(Size*logPixelsSY)/72
   
   NumPut(TextHeight, logfont, 0)                                       ; Set text height
   ;NumPut(TextWidth, logfont, 4) ; Change text width
   
    NumPut(Weight, logfont, 16)                                          ; Set text weight
   If InStr(Style, "Underline")                                       ; Set style to be either underline,italic,Strikeout
   NumPut(1, logfont, 21)
   If InStr(Style, "Italic")
   NumPut(1, logfont, 20)
   If InStr(Style, "Strikeout")
   NumPut(1, logfont, 22)
   
   NumPut(5, logfont, 26)                                             ; ClearType antialiasing XP and above only
   
    AlignWord := "Right,Top,Bottom,Centre,Left"
    AlignNum := "2,0,8,6,0"
   
    StringSplit, AlignWords, AlignWord, `,
    StringSplit, AlignNums, AlignNum, `,
   
    Loop, %AlignWords0%
    StringReplace, Align, Align, % AlignWords%A_Index%, % AlignNums%A_Index%, All
    StringSplit, Pos, Align, |
    Align := Pos1 | Pos2

    StringLeft, FaceName, Font, 32
    DllCall("lStrcpy", "UInt", &logfont + 28, "Str", FaceName)                       ; Set font
    DllCall("SetTextAlign", "UInt", mDC, "UInt", Align)                             ; Align text
    #hFont := DllCall("CreateFontIndirect", "UInt", &logfont)
    #hOldFont := DllCall("SelectObject", "UInt", mDC, "UInt", #hFont)                ; Change DC Font
    TColour := "0x" . TColour
    prevColor := DllCall("SetTextColor", "UInt", mDC, "UInt", ((TColour & 0xFF) << 16) + (TColour & 0xFF00) + ((TColour >> 16) & 0xFF), "UInt")
   
    If InStr(x, ":")
    {
        StringSplit, XRatio, x, :
        XPos := XRatio1*(Width//XRatio2)
    }
   Else
   XPos := x
   
    If InStr(y, ":")                                                                ; Get ratios of x and y position
    {
        StringSplit, YRatio, y, :
        YPos := YRatio1*(Height//YRatio2)
    }
   Else
   YPos := y
   
    StringSplit, Text, Text, `n
       
    Loop, %Text0%
    {   
        DllCall("TextOut", "UInt", mDC, "Int", XPos, "Int", YPos, "Str", Text%A_Index%, "UInt", StrLen(Text%A_Index%))
        YPos += 1.5*Size                                                            ; Draw text Into device
    }   
                                                                                   
    DllCall("SelectObject", "UInt", mDC, "UInt", #hOldFont)
    DllCall("DeleteObject", "UInt", #hFont)                                         ; Restore DC Font
       
    DllCall("gdiplus\GdipCreateBitmapFromHBITMAP", "UInt", hBM, "UInt", 0, "UIntP", pImage)
   DllCall("SelectObject", "Uint", mDC, "Uint", oBM)
   DllCall("DeleteObject", "Uint", hBM)
   DllCall("DeleteDC", "Uint", mDC)
    DllCall("gdiplus\GdipGetImageEncodersSize", "UIntP", nCount, "UIntP", nSize)    ; Get encoder
    VarSetCapacity(ci, nSize)
    DllCall("gdiplus\GdipGetImageEncoders", "UInt", nCount, "UInt", nSize, "UInt", &ci)
       
    Loop, %nCount%
    {
        nSize := DllCall("WideCharToMultiByte", "UInt", 0, "UInt", 0, "UInt", NumGet(ci, 76 * (A_Index - 1) + 44), "Int", -1, "UInt", 0, "Int",  0, "UInt", 0, "UInt", 0)
        VarSetCapacity(sString, nSize)
        DllCall("WideCharToMultiByte", "UInt", 0, "UInt", 0, "UInt", NumGet(ci, 76 * (A_Index - 1) + 44), "Int", -1, "Str", sString, "Int", nSize, "UInt", 0, "UInt", 0)
   
        If !InStr(sString, Extension)                                               ; Find encoder matching extension
        Continue
        pCodec := &ci + 76 * (A_Index - 1)
        Break
    }
    If pImage                                                                     ; Save image to file
    {
        sString := Output
        nSize := DllCall("MultiByteToWideChar", "UInt", 0, "UInt", 0, "UInt", &sString, "Int", -1, "UInt", 0, "Int", 0)
        VarSetCapacity(wString, nSize * 2)
        DllCall("MultiByteToWideChar", "UInt", 0, "UInt", 0, "UInt", &sString, "Int", -1, "UInt", &wString, "Int", nSize)
   
        DllCall("gdiplus\GdipSaveImageToFile", "UInt", pImage, "UInt", &wString, "UInt", pCodec, "UInt", 0)
      DllCall("gdiplus\GdipDisposeImage", "Uint", pImage)
    }
    GoSub, TTS_GdiplusShutdown
    Return, XPos . "|" . YPos

   TTS_GdiplusShutdown:
    DllCall("gdiplus\GdiplusShutdown" , "UInt", pToken)                            ; Shutdown and free library
    DllCall("FreeLibrary", "UInt", hGdiPlus)
   Return
}

nL := CoordsLeft, nT := CoordsTop, nW := CoordsRight, nH := CoordsBottom

nL := CoordsLeft, nT := CoordsTop, nW := CoordsRight - CoordsLeft, nH := CoordsBottom - CoordsTop

nW-nL, nH-nT

nW, nH