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|
{-# LANGUAGE ScopedTypeVariables, FlexibleInstances, MultiParamTypeClasses #-}
{-# OPTIONS_HADDOCK hide #-}
-- -*-haskell-*-
-- GIMP Toolkit (GTK) Pixbuf as Array
--
-- Author : Ciancia, Axel Simon
--
-- Created: 26 March 2002
--
-- Copyright (C) 2002-2005 Axel Simon
--
-- This library is free software; you can redistribute it and/or
-- modify it under the terms of the GNU Lesser General Public
-- License as published by the Free Software Foundation; either
-- version 2.1 of the License, or (at your option) any later version.
--
-- This library is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-- Lesser General Public License for more details.
--
-- |
-- Maintainer : gtk2hs-users@lists.sourceforge.net
-- Stability : provisional
-- Portability : no (uses MTC, depends on internal GHC module)
--
-- 'PixbufData' exposes 'Pixbuf's as mutable array.
--
-- #hide
module Graphics.UI.Gtk.Gdk.PixbufData (
PixbufData,
mkPixbufData
) where
import System.Glib.FFI
import Graphics.UI.Gtk.Types
-- internal module of GHC
import Data.Array.Base ( MArray(..), newArray_, unsafeRead, unsafeWrite,
getBounds, getNumElements )
-- | An array that stored the raw pixel data of a 'Pixbuf'.
--
-- * See 'Graphics.UI.Gtk.Gdk.Pixbuf.pixbufGetPixels'.
--
data PixbufData i e = PixbufData !Pixbuf
{-# UNPACK #-} !(Ptr e)
!(i,i)
{-# UNPACK #-} !Int
mkPixbufData :: Storable e => Pixbuf -> Ptr e -> Int -> PixbufData Int e
mkPixbufData pb (ptr :: Ptr e) size =
PixbufData pb ptr (0, count) count
where count = fromIntegral (size `div` sizeOf (undefined :: e))
-- | 'PixbufData' is a mutable array.
instance Storable e => MArray PixbufData e IO where
newArray (l,u) e = error "Gtk.Gdk.Pixbuf.newArray: not implemented"
newArray_ (l,u) = error "Gtk.Gdk.Pixbuf.newArray_: not implemented"
{-# INLINE unsafeRead #-}
unsafeRead (PixbufData (Pixbuf pb) pixPtr _ _) idx = do
e <- peekElemOff pixPtr idx
touchForeignPtr pb
return e
{-# INLINE unsafeWrite #-}
unsafeWrite (PixbufData (Pixbuf pb) pixPtr _ _) idx elem = do
pokeElemOff pixPtr idx elem
touchForeignPtr pb
{-# INLINE getBounds #-}
getBounds (PixbufData _ _ bd _) = return bd
{-# INLINE getNumElements #-}
getNumElements (PixbufData _ _ _ count) = return count
|
