Gdip_CompareImage

Gdip_CompareImage(Bitmap1, Bitmap2, ByRef x, ByRef y)
{
    static _CompareImage
    if !_CompareImage
    {
        MCode_CompareImage := "8B442414995383E2035503C233DB56C1F802395C241C577E458B7C24188B74241C03C003C0894424248DA4240000000033C98"
        . "5F67E1B8B5424142B5424188BC78B2C023B28753383C10183C0043BCE7CEF037C242483C3013B5C24207CD28B4C24288B54242C5F5E5DC701FFFFFFFF"
        . "C702FFFFFFFF83C8FF5BC38B5424288B44242C5F5E890A89185D33C05BC3"

        VarSetCapacity(_CompareImage, StrLen(MCode_CompareImage)//2)
        Loop % StrLen(MCode_CompareImage)//2      ;%
            NumPut("0x" SubStr(MCode_CompareImage, (2*A_Index)-1, 2), _CompareImage, A_Index-1, "char")

        DllCall("VirtualProtect", "ptr", &_CompareImage, "ptr", VarSetCapacity(_CompareImage), "uint", 0x40, "ptrA", 0)
    }

    Gdip_GetImageDimensions(Bitmap1, width1, height1), Gdip_GetImageDimensions(Bitmap2, width2, height2)

    if (width1 != width2 || height1 != height2)
        return -1

    E1 := Gdip_LockBits(Bitmap1, 0, 0, width1, height1, Stride1, Scan01, BitmapData1)
    E2 := Gdip_LockBits(Bitmap2, 0, 0, width2, height2, Stride2, Scan02, BitmapData2)
    if (E1 || E2)
        return -2

    x := y := 0
    E := DllCall(&_CompareImage, "ptr", Scan01, "ptr", Scan02, "int", width1, "int", height1, "int", Stride1, "int*", x, "int*", y)

   Gdip_UnlockBits(Bitmap1, BitmapData1), Gdip_UnlockBits(Bitmap2, BitmapData2)
   return (E = "") ? -3 : E
}