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

Extra data passed to a "gst-copy" transform #GstMetaTransformFunction.
-}

module GI.Gst.Structs.MetaTransformCopy
    ( 

-- * Exported types
    MetaTransformCopy(..)                   ,
    newZeroMetaTransformCopy                ,
    noMetaTransformCopy                     ,


 -- * Properties
-- ** Offset
    metaTransformCopyReadOffset             ,


-- ** Region
    metaTransformCopyReadRegion             ,


-- ** Size
    metaTransformCopyReadSize               ,




    ) 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.Gst.Types
import GI.Gst.Callbacks

newtype MetaTransformCopy = MetaTransformCopy (ForeignPtr MetaTransformCopy)
-- | Construct a `MetaTransformCopy` struct initialized to zero.
newZeroMetaTransformCopy :: MonadIO m => m MetaTransformCopy
newZeroMetaTransformCopy = liftIO $ callocBytes 24 >>= wrapPtr MetaTransformCopy

noMetaTransformCopy :: Maybe MetaTransformCopy
noMetaTransformCopy = Nothing

metaTransformCopyReadRegion :: MetaTransformCopy -> IO Bool
metaTransformCopyReadRegion s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 0) :: IO CInt
    let val' = (/= 0) val
    return val'

metaTransformCopyReadOffset :: MetaTransformCopy -> IO Word64
metaTransformCopyReadOffset s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 8) :: IO Word64
    return val

metaTransformCopyReadSize :: MetaTransformCopy -> IO Word64
metaTransformCopyReadSize s = withManagedPtr s $ \ptr -> do
    val <- peek (ptr `plusPtr` 16) :: IO Word64
    return val

type family ResolveMetaTransformCopyMethod (t :: Symbol) (o :: *) :: * where
    ResolveMetaTransformCopyMethod l o = MethodResolutionFailed l o

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

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