    -----------------------------------------------------------------------------
    -- |
    -- Module      :  Graphics.UI.SDL.Rotozoomer
    -- Copyright   :  (c) David Himmelstrup 2005
    -- License     :  BSD-like
    --
    -- Maintainer  :  lemmih@gmail.com
    -- Stability   :  provisional
    -- Portability :  portable
    --
    -----------------------------------------------------------------------------
    module Graphics.UI.SDL.Rotozoomer where

    import Foreign
    import Foreign.C

    import Graphics.UI.SDL.Video
    import Graphics.UI.SDL.General
    import Graphics.UI.SDL.Types

    finalizeWhenNotNull :: String -> Ptr SurfaceStruct -> IO Surface
    finalizeWhenNotNull :: String -> Ptr SurfaceStruct -> IO Surface
    finalizeWhenNotNull errMsg :: String
    errMsg image :: Ptr SurfaceStruct
    image
        = if Ptr SurfaceStruct
    image Ptr SurfaceStruct -> Ptr SurfaceStruct -> Bool
    forall a. Eq a => a -> a -> Bool
    == Ptr SurfaceStruct
    forall a. Ptr a
    nullPtr
             then String -> IO Surface
    forall a. String -> IO a
    failWithError String
    errMsg
             else Ptr SurfaceStruct -> IO Surface
    mkFinalizedSurface Ptr SurfaceStruct
    image

    -- SDL_Surface * rotozoomSurface (SDL_Surface *src, double angle, double zoom, int smooth);
    foreign import ccall unsafe "rotozoomSurface" sdlRotozoom
        :: Ptr SurfaceStruct -> Double -> Double -> Int -> IO (Ptr SurfaceStruct)
    rotozoom :: Surface -> Double -> Double -> Bool -> IO Surface
    rotozoom :: Surface -> Double -> Double -> Bool -> IO Surface
    rotozoom src :: Surface
    src angle :: Double
    angle zoom :: Double
    zoom smooth :: Bool
    smooth
        = Surface -> (Ptr SurfaceStruct -> IO Surface) -> IO Surface
    forall a b. ForeignPtr a -> (Ptr a -> IO b) -> IO b
    withForeignPtr Surface
    src ((Ptr SurfaceStruct -> IO Surface) -> IO Surface)
    -> (Ptr SurfaceStruct -> IO Surface) -> IO Surface
    forall a b. (a -> b) -> a -> b
    $ \imgSrc :: Ptr SurfaceStruct
    imgSrc ->
          Ptr SurfaceStruct
    -> Double -> Double -> Int -> IO (Ptr SurfaceStruct)
    sdlRotozoom Ptr SurfaceStruct
    imgSrc Double
    angle Double
    zoom (Bool -> Int
    forall a. Num a => Bool -> a
    fromBool Bool
    smooth) IO (Ptr SurfaceStruct)
    -> (Ptr SurfaceStruct -> IO Surface) -> IO Surface
    forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
    >>= String -> Ptr SurfaceStruct -> IO Surface
    finalizeWhenNotNull "rotozoomSurface"

    {-
    -- SDL_Surface * rotozoomSurfaceXY (SDL_Surface *src, double angle, double zoomx, double zoomy, int smooth);
    foreign import ccall unsafe "rotozoomSurfaceXY" sdlRotozoomXY
        :: Ptr SurfaceStruct -> Double -> Double -> Double -> Int -> IO (Ptr SurfaceStruct)
    rotozoomXY :: Surface -> Double -> Double -> Double -> Bool -> IO Surface
    rotozoomXY src angle zoomx zoomy smooth
        = withForeignPtr src $ \imgSrc ->
          sdlRotozoomXY imgSrc angle zoomx zoomy (fromBool smooth) >>= finalizeWhenNotNull "rotozoomSurfaceXY"
    -}

    -- SDL_Surface * zoomSurface (SDL_Surface *src, double zoomx, double zoomy, int smooth);
    foreign import ccall unsafe "zoomSurface" sdlZoom
        :: Ptr SurfaceStruct -> Double -> Double -> Int -> IO (Ptr SurfaceStruct)
    zoom :: Surface -> Double -> Double -> Bool -> IO Surface
    zoom :: Surface -> Double -> Double -> Bool -> IO Surface
    zoom src :: Surface
    src zoomx :: Double
    zoomx zoomy :: Double
    zoomy smooth :: Bool
    smooth
        = Surface -> (Ptr SurfaceStruct -> IO Surface) -> IO Surface
    forall a b. ForeignPtr a -> (Ptr a -> IO b) -> IO b
    withForeignPtr Surface
    src ((Ptr SurfaceStruct -> IO Surface) -> IO Surface)
    -> (Ptr SurfaceStruct -> IO Surface) -> IO Surface
    forall a b. (a -> b) -> a -> b
    $ \imgSrc :: Ptr SurfaceStruct
    imgSrc ->
          Ptr SurfaceStruct
    -> Double -> Double -> Int -> IO (Ptr SurfaceStruct)
    sdlZoom Ptr SurfaceStruct
    imgSrc Double
    zoomx Double
    zoomy (Bool -> Int
    forall a. Num a => Bool -> a
    fromBool Bool
    smooth) IO (Ptr SurfaceStruct)
    -> (Ptr SurfaceStruct -> IO Surface) -> IO Surface
    forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
    >>= String -> Ptr SurfaceStruct -> IO Surface
    finalizeWhenNotNull "zoomSurface"