VideoAlignment.hs


{- |
Copyright  : Will Thompson, Iñaki García Etxebarria and Jonas Platte
License    : LGPL-2.1
Maintainer : Iñaki García Etxebarria (garetxe@gmail.com)

Extra alignment paramters for the memory of video buffers. This
structure is usually used to configure the bufferpool if it supports the
#GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT.
-}

module GI.GstVideo.Structs.VideoAlignment
    ( 

-- * Exported types
    VideoAlignment(..)                      ,
    newZeroVideoAlignment                   ,
    noVideoAlignment                        ,


 -- * Methods
-- ** videoAlignmentReset
    VideoAlignmentResetMethodInfo           ,
    videoAlignmentReset                     ,




 -- * Properties
-- ** PaddingBottom
    videoAlignmentReadPaddingBottom         ,


-- ** PaddingLeft
    videoAlignmentReadPaddingLeft           ,


-- ** PaddingRight
    videoAlignmentReadPaddingRight          ,


-- ** PaddingTop
    videoAlignmentReadPaddingTop            ,




    ) where

import Prelude ()
import Data.GI.Base.ShortPrelude

import qualified Data.Text as T
import qualified Data.ByteString.Char8 as B
import qualified Data.Map as Map

import GI.GstVideo.Types
import GI.GstVideo.Callbacks

newtype VideoAlignment = VideoAlignment (ForeignPtr VideoAlignment)
-- | Construct a `VideoAlignment` struct initialized to zero.
newZeroVideoAlignment :: MonadIO m => m VideoAlignment
newZeroVideoAlignment = liftIO $ callocBytes 32 >>= wrapPtr VideoAlignment

noVideoAlignment :: Maybe VideoAlignment
noVideoAlignment = Nothing

videoAlignmentReadPaddingTop :: VideoAlignment -> IO Word32
videoAlignmentReadPaddingTop s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 0) :: IO Word32
    return val

videoAlignmentReadPaddingBottom :: VideoAlignment -> IO Word32
videoAlignmentReadPaddingBottom s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 4) :: IO Word32
    return val

videoAlignmentReadPaddingLeft :: VideoAlignment -> IO Word32
videoAlignmentReadPaddingLeft s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 8) :: IO Word32
    return val

videoAlignmentReadPaddingRight :: VideoAlignment -> IO Word32
videoAlignmentReadPaddingRight s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 12) :: IO Word32
    return val

-- XXX Skipped getter for "VideoAlignment:stride_align" :: Not implemented: "Don't know how to unpack C array of type TCArray False 4 (-1) (TBasicType TUInt32)"

-- method VideoAlignment::reset
-- method type : OrdinaryMethod
-- Args : [Arg {argCName = "_obj", argType = TInterface "GstVideo" "VideoAlignment", direction = DirectionIn, mayBeNull = False, argScope = ScopeTypeInvalid, argClosure = -1, argDestroy = -1, argCallerAllocates = False, transfer = TransferNothing}]
-- Lengths : []
-- returnType : TBasicType TVoid
-- throws : False
-- Skip return : False

foreign import ccall "gst_video_alignment_reset" gst_video_alignment_reset :: 
    Ptr VideoAlignment ->                   -- _obj : TInterface "GstVideo" "VideoAlignment"
    IO ()


videoAlignmentReset ::
    (MonadIO m) =>
    VideoAlignment                          -- _obj
    -> m ()                                 -- result
videoAlignmentReset _obj = liftIO $ do
    let _obj' = unsafeManagedPtrGetPtr _obj
    gst_video_alignment_reset _obj'
    touchManagedPtr _obj
    return ()

data VideoAlignmentResetMethodInfo
instance (signature ~ (m ()), MonadIO m) => MethodInfo VideoAlignmentResetMethodInfo VideoAlignment signature where
    overloadedMethod _ = videoAlignmentReset

type family ResolveVideoAlignmentMethod (t :: Symbol) (o :: *) :: * where
    ResolveVideoAlignmentMethod "reset" o = VideoAlignmentResetMethodInfo
    ResolveVideoAlignmentMethod l o = MethodResolutionFailed l o

instance (info ~ ResolveVideoAlignmentMethod t VideoAlignment, MethodInfo info VideoAlignment p) => IsLabelProxy t (VideoAlignment -> p) where
    fromLabelProxy _ = overloadedMethod (MethodProxy :: MethodProxy info)

#if MIN_VERSION_base(4,9,0)
instance (info ~ ResolveVideoAlignmentMethod t VideoAlignment, MethodInfo info VideoAlignment p) => IsLabel t (VideoAlignment -> p) where
    fromLabel _ = overloadedMethod (MethodProxy :: MethodProxy info)
#endif