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|
-----------------------------------------------------------------------------
-- |
-- Module : Graphics.X11.Xlib.Image
-- Copyright : (c) Frederik Eaton 2006
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org, frederik@ofb.net
-- Stability : provisional
-- Portability : portable
--
-- Xlib image routines
--
-----------------------------------------------------------------------------
module Graphics.X11.Xlib.Image(
Image,
createImage,
putImage,
destroyImage,
getImage,
xGetPixel,
getPixel
) where
import Graphics.X11.Types
import Graphics.X11.Xlib.Types
import Foreign (Ptr, throwIfNull)
import Foreign.C.Types
import System.IO.Unsafe (unsafePerformIO)
----------------------------------------------------------------
-- Image
----------------------------------------------------------------
-- | interface to the X11 library function @XCreateImage()@.
createImage :: Display -> Visual -> CInt -> ImageFormat -> CInt -> Ptr CChar -> Dimension -> Dimension -> CInt -> CInt -> IO Image
createImage display vis depth format offset dat width height bitmap_pad bytes_per_line = do
image <- throwIfNull "createImage" (xCreateImage display vis depth format offset dat width height bitmap_pad bytes_per_line)
return (Image image)
foreign import ccall unsafe "HsXlib.h XCreateImage"
xCreateImage :: Display -> Visual -> CInt -> ImageFormat -> CInt ->
Ptr CChar -> Dimension -> Dimension -> CInt -> CInt -> IO (Ptr Image)
-- | interface to the X11 library function @XPutImage()@.
foreign import ccall unsafe "HsXlib.h XPutImage"
putImage :: Display -> Drawable -> GC -> Image ->
Position -> Position -> Position -> Position -> Dimension -> Dimension -> IO ()
-- | interface to the X11 library function @XDestroyImage()@.
foreign import ccall unsafe "HsXlib.h XDestroyImage"
destroyImage :: Image -> IO ()
-- | interface to the X11 library function @XGetImage()@.
getImage :: Display -> Drawable -> CInt -> CInt -> CUInt -> CUInt -> CULong -> ImageFormat -> IO Image
getImage display d x y width height plane_mask format = do
image <- throwIfNull "getImage" (xGetImage display d x y width height plane_mask format)
return (Image image)
foreign import ccall unsafe "HsXlib.h XGetImage"
xGetImage :: Display -> Drawable -> CInt -> CInt -> CUInt -> CUInt -> CULong -> ImageFormat -> IO (Ptr Image)
foreign import ccall unsafe "HsXlib.h XGetPixel"
xGetPixel :: Image -> CInt -> CInt -> IO CULong
-- | interface to the X11 library function @XGetPixel()@.
getPixel :: Image -> CInt -> CInt -> CULong
getPixel i x y = unsafePerformIO (xGetPixel i x y)
{- don't need XInitImage since Haskell users probably won't be setting
members of the XImage structure themselves -}
-- XInitImage omitted
-- XGetSubImage omitted
|
