doorstuck adjustable fullscreen script

# doorstuck adjustable fullscreen script

CreateWindowEx            = Win32API.new('user32'  , 'CreateWindowEx'           , 'ippiiiiiiiii', 'i')
GetDC                     = Win32API.new('user32'  , 'GetDC'                    , 'i'           , 'i')
GetSystemMetrics          = Win32API.new('user32'  , 'GetSystemMetrics'         , 'i'           , 'i')
FillRect                  = Win32API.new('user32'  , 'FillRect'                 , 'ipi'         , 'i')
FindWindow                = Win32API.new('user32'  , 'FindWindow'               , 'pp'          , 'i')
ReleaseDC                 = Win32API.new('user32'  , 'ReleaseDC'                , 'ii'          , 'i')
SetWindowLong             = Win32API.new('user32'  , 'SetWindowLong'            , 'iii'         , 'i')
SetWindowPos              = Win32API.new('user32'  , 'SetWindowPos'             , 'iiiiiii'     , 'i')
ShowWindow                = Win32API.new('user32'  , 'ShowWindow'               , 'ii'          , 'i')
UpdateWindow              = Win32API.new('user32'  , 'UpdateWindow'             , 'i'           , 'i')
CreateSolidBrush          = Win32API.new('gdi32'   , 'CreateSolidBrush'         , 'i'           , 'i')
DeleteObject              = Win32API.new('gdi32'   , 'DeleteObject'             , 'i'           , 'i')

screenRect = Rect.new(0, 0, GetSystemMetrics.call(0), GetSystemMetrics.call(1))

#universal constant
rpgMakerX = 640
#height that we would render if rpg maker would render non 32 tiles
wishfulY = rpgMakerX * screenRect.height / screenRect.width

#divide by 32 and multiply by 32 to get the actual number of pixels that
#could be rendered by RPG maker without glitches
rpgMakerY = (wishfulY / 32) * 32

rpgMakerRaimander = wishfulY - rpgMakerY

Graphics.resize_screen(rpgMakerX, rpgMakerY)

#now we need to calculate the actual screen margin from top and bottom
actualScreenMargin = screenRect.height * rpgMakerRaimander / wishfulY
mainHeight = screenRect.height - actualScreenMargin
upperMargin = actualScreenMargin / 2

#draw black background on all the screen
BackgroundHandler = CreateWindowEx.call(0x08000008, 'Static', '', 0x80000000, 0, 0, 0, 0, 0, 0, 0, 0)
ShowWindow.call(BackgroundHandler, 3)
UpdateWindow.call(BackgroundHandler)
dc    = GetDC.call(BackgroundHandler)
rect  = [0, 0, screenRect.width, screenRect.height].pack('l4')
brush = CreateSolidBrush.call(0)
FillRect.call(dc, rect, brush)
ReleaseDC.call(BackgroundHandler, dc)
DeleteObject.call(brush)

mainWindowHandler = FindWindow.call('RGSS Player', 0)
SetWindowLong.call(mainWindowHandler, -16, 0x14000000)
SetWindowPos.call(mainWindowHandler, -1, 0, upperMargin, screenRect.width, mainHeight, 0)