#include <GDIPlus.au3>
#include <WinAPI.au3>
#include <Memory.au3>
#include <WindowsConstants.au3>

HotKeySet("{ESC}","_exit")
Func _exit()
    Exit
EndFunc


_GDIPlus_Startup()
Global $screenDC
Global $gfxContext, $hDC, $hHBitmap, $buffer, $hPen
Global $GUI, $GUI_W = 400, $GUI_H = 400

; chay notepad
If ProcessExists("mspaint.exe") = False Then Run("mspaint.exe")
$hwnd = WinWait("[CLASS:MSPaintApp]")

$screenDC = _WinAPI_GetDc($hwnd) ; neu muon chup man hinh thi cho $hwnd = 0

$GUI = GUICreate("", $GUI_W, $GUI_H)
GUISetState()
WinSetOnTop($GUI, "", True)
__StartUp()

While GUIGetMsg() <> -3

    $bitmap = ScreenToBitmap($screenDC, 10, 150, $GUI_W, $GUI_H)

    _GDIPlus_GraphicsClear($gfxContext, 0xFF555555)
    _GDIPlus_GraphicsDrawImage($gfxContext, $bitmap, 0, 0)

    ; _BitmapGetDiffPix($bitmap, $color)
    ; $bitmap to find different pixel
    ; $color to compare
    ; Return value
    ; $aDiffPix[n][0] = x
    ; $aDiffPix[n][1] = y
    ; $aDiffPix[n][2] = color

    $aDiffPix = _BitmapGetDiffPix($bitmap, 0xFFFFFFFF) ; 0xAARRGGBB

    For $i = 0 To UBound($aDiffPix) - 1
        _GDIPlus_PenSetColor($hPen, $aDiffPix[$i][2])
        _GDIPlus_GraphicsDrawEllipse($gfxContext, $aDiffPix[$i][0] - 10, $aDiffPix[$i][1] - 10, 20, 20, $hPen)
    Next

    _WinAPI_BitBlt($hDC, 0, 0, $GUI_W, $GUI_H, $buffer, 0, 0, $SRCCOPY)
WEnd

Func _BitmapGetDiffPix($hBitmap, $Color)

    Local $iW = _GDIPlus_ImageGetWidth($hBitmap), $iH = _GDIPlus_ImageGetHeight($hBitmap) ;get width and height of the image

    Local $tBitmapData = _GDIPlus_BitmapLockBits($hBitmap, 0, 0, $iW, $iH, BitOR($GDIP_ILMWRITE, $GDIP_ILMREAD), $GDIP_PXF32ARGB) ;locks a portion of a bitmap for reading and writing. More infor at http://msdn.microsoft.com/en-us/library/windows/desktop/ms536298(v=vs.85).aspx
    Local $iScan0 = DllStructGetData($tBitmapData, "Scan0") ;get scan0 (pixel data) from locked bitmap
    Local $iSearchPixel = Int(0xFF000080), $iReplaceColor = 0x00000000 ;color format 0xAARRGGBB
    Local $tPixel = DllStructCreate("int[" & $iW * $iH & "];", $iScan0)
    Local $iRowOffset, $tmparray[$iW * $iH][3], $index = 0, $pixel

    For $iY = 0 To $iH - 1
        $iRowOffset = $iY * $iW + 1
        For $iX = 0 To $iW - 1

            $pixel = DllStructGetData($tPixel, 1, $iRowOffset + $iX)
            If $pixel <> $Color Then
                $tmparray[$index][0] = $iX
                $tmparray[$index][1] = $iY
                $tmparray[$index][2] = $pixel
                $index += 1
            EndIf
        Next
    Next
    _GDIPlus_BitmapUnlockBits($hBitmap, $tBitmapData) ;unlocks a portion of a bitmap that was locked by _GDIPlus_BitmapLockBits
    If $index = 0 Then Return False

    ReDim $tmparray[$index][3]
    Return $tmparray
EndFunc   ;==>Example


Func ScreenToBitmap($hDC, $x, $y, $w, $h)

    Local $tDC = _WinAPI_CreateCompatibleDC($hDC)
    Local $hBMP = _WinAPI_CreateCompatibleBitmap($hDC, $w, $h)
    _WinAPI_SelectObject($tDC, $hBMP)
    _WinAPI_BitBlt($tDC, 0, 0, $w, $h, $hDC, $x, $y, $SRCCOPY)

    $hBitmap = _GDIPlus_BitmapCreateFromHBITMAP($hBMP)

    _WinAPI_DeleteObject($hBMP)
    _WinAPI_DeleteDC($tDC)
;~     Return $hBMP
    Return $hBitmap
EndFunc

Func __StartUp()

    $hDC = _WinAPI_GetDC($GUI)
    $hHBitmap = _WinAPI_CreateCompatibleBitmap($hDC, $GUI_W, $GUI_H)

    $buffer = _WinAPI_CreateCompatibleDC($hDC)
    _WinAPI_SelectObject($buffer, $hHBitmap)

    $gfxContext = _GDIPlus_GraphicsCreateFromHDC($buffer)
    _GDIPlus_GraphicsSetSmoothingMode($gfxContext, $GDIP_SMOOTHINGMODE_HIGHQUALITY)
    _GDIPlus_GraphicsSetPixelOffsetMode($gfxContext, $GDIP_PIXELOFFSETMODE_HIGHQUALITY)
    $hPen = _GDIPlus_PenCreate(0)
EndFunc