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|
-----------------------------------------------------------------------------
-- |
-- Module : Graphics.X11.Xlib.Context
-- Copyright : (c) Alastair Reid, 1999-2003
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : libraries@haskell.org
-- Stability : provisional
-- Portability : portable
--
-- A collection of FFI declarations for interfacing with Xlib Graphics
-- Contexts.
--
-----------------------------------------------------------------------------
module Graphics.X11.Xlib.Context(
setArcMode,
setBackground,
setForeground,
setFunction,
setGraphicsExposures,
setClipMask,
setClipOrigin,
setDashes,
setFillRule,
setFillStyle,
setFont,
setLineAttributes,
setPlaneMask,
setState,
setStipple,
setSubwindowMode,
setTSOrigin,
setTile,
createGC,
gContextFromGC,
freeGC,
flushGC,
copyGC,
) where
import Graphics.X11.Types
import Graphics.X11.Xlib.Types
import Foreign
import Foreign.C
----------------------------------------------------------------
-- Graphics contexts
----------------------------------------------------------------
-- Convenience functions
-- | interface to the X11 library function @XSetArcMode()@.
foreign import ccall unsafe "HsXlib.h XSetArcMode"
setArcMode :: Display -> GC -> ArcMode -> IO ()
-- | interface to the X11 library function @XSetBackground()@.
foreign import ccall unsafe "HsXlib.h XSetBackground"
setBackground :: Display -> GC -> Pixel -> IO ()
-- | interface to the X11 library function @XSetForeground()@.
foreign import ccall unsafe "HsXlib.h XSetForeground"
setForeground :: Display -> GC -> Pixel -> IO ()
-- | interface to the X11 library function @XSetFunction()@.
foreign import ccall unsafe "HsXlib.h XSetFunction"
setFunction :: Display -> GC -> GXFunction -> IO ()
-- | interface to the X11 library function @XSetGraphicsExposures()@.
foreign import ccall unsafe "HsXlib.h XSetGraphicsExposures"
setGraphicsExposures :: Display -> GC -> Bool -> IO ()
-- | interface to the X11 library function @XSetClipMask()@.
foreign import ccall unsafe "HsXlib.h XSetClipMask"
setClipMask :: Display -> GC -> Pixmap -> IO ()
-- | interface to the X11 library function @XSetClipOrigin()@.
foreign import ccall unsafe "HsXlib.h XSetClipOrigin"
setClipOrigin :: Display -> GC -> Position -> Position -> IO ()
-- XSetClipRectangles omitted because it's not clear when it's safe to delete the
-- array of rectangles
-- | interface to the X11 library function @XSetDashes()@.
setDashes :: Display -> GC -> CInt -> String -> CInt -> IO ()
setDashes display gc dash_offset dashes n =
withCString dashes $ \ dash_list ->
xSetDashes display gc dash_offset dash_list n
foreign import ccall unsafe "HsXlib.h XSetDashes"
xSetDashes :: Display -> GC -> CInt -> CString -> CInt -> IO ()
-- | interface to the X11 library function @XSetFillRule()@.
foreign import ccall unsafe "HsXlib.h XSetFillRule"
setFillRule :: Display -> GC -> FillRule -> IO ()
-- | interface to the X11 library function @XSetFillStyle()@.
foreign import ccall unsafe "HsXlib.h XSetFillStyle"
setFillStyle :: Display -> GC -> FillStyle -> IO ()
-- | interface to the X11 library function @XSetFont()@.
foreign import ccall unsafe "HsXlib.h XSetFont"
setFont :: Display -> GC -> Font -> IO ()
-- | interface to the X11 library function @XSetLineAttributes()@.
foreign import ccall unsafe "HsXlib.h XSetLineAttributes"
setLineAttributes :: Display -> GC -> CInt -> LineStyle ->
CapStyle -> JoinStyle -> IO ()
-- | interface to the X11 library function @XSetPlaneMask()@.
foreign import ccall unsafe "HsXlib.h XSetPlaneMask"
setPlaneMask :: Display -> GC -> Pixel -> IO ()
-- | interface to the X11 library function @XSetState()@.
foreign import ccall unsafe "HsXlib.h XSetState"
setState :: Display -> GC -> Pixel -> Pixel ->
GXFunction -> Pixel -> IO ()
-- | interface to the X11 library function @XSetStipple()@.
foreign import ccall unsafe "HsXlib.h XSetStipple"
setStipple :: Display -> GC -> Pixmap -> IO ()
-- | interface to the X11 library function @XSetSubwindowMode()@.
foreign import ccall unsafe "HsXlib.h XSetSubwindowMode"
setSubwindowMode :: Display -> GC -> SubWindowMode -> IO ()
-- | interface to the X11 library function @XSetTSOrigin()@.
foreign import ccall unsafe "HsXlib.h XSetTSOrigin"
setTSOrigin :: Display -> GC -> Position -> Position -> IO ()
-- | interface to the X11 library function @XSetTile()@.
foreign import ccall unsafe "HsXlib.h XSetTile"
setTile :: Display -> GC -> Pixmap -> IO ()
-- ToDo: create a real interface to this
-- | partial interface to the X11 library function @XCreateGC()@.
createGC :: Display -> Drawable -> IO GC
createGC display d = xCreateGC display d 0 nullPtr
foreign import ccall unsafe "HsXlib.h XCreateGC"
xCreateGC :: Display -> Drawable -> ValueMask -> Ptr GCValues -> IO GC
type ValueMask = Word32
-- OLD:
-- %synonym : GCValueSet : Ptr
-- in rtsDummy
--
-- {%
-- typedef unsigned long GCMask; /* cf XtGCMask */
-- typedef struct _gcvalues {
-- GCMask mask;
-- XGCValues values;
-- }* GCValueSet;
-- %}
--
-- IMPURE GCValueSet emptyGCValueSet()
-- RESULT: (RETVAL = (GCValueSet) malloc(sizeof(struct _gcvalues))) ? RETVAL->mask = 0, RETVAL : RETVAL;
-- POST: RETVAL != NULL
--
-- IMPURE void setGCForeground(colour, set)
-- IN Pixel colour
-- IN GCValueSet set
-- RESULT: set->mask |= GCForeground; set->values.foreground = colour
--
-- IMPURE void setGCBackground(colour, set)
-- IN Pixel colour
-- IN GCValueSet set
-- RESULT: set->mask |= GCBackground; set->values.background = colour
--
-- IMPURE void freeGCValueSet(set)
-- IN GCValueSet set
-- RESULT: free(set)
--
-- IMPURE GC XCreateGC(display, d, set->mask, &(set->values))
-- NAME: xCreateGC
-- IN Display* display
-- IN Drawable d
-- IN GCValueSet set
--
-- IMPURE void XChangeGC(display, gc, set->mask, &(set->values))
-- NAME: xChangeGC
-- IN Display* display
-- IN GC gc
-- IN GCValueSet set
--
-- STARTH
-- -- Code that packages GCValueSets up in a clean monoidic way.
--
-- data GCSetter = GCSetter (GCValueSet -> IO ()) -- should be newtype
--
-- createGC :: Display -> Drawable -> GCSetter -> IO GC
-- createGC display d (GCSetter setter) =
-- emptyGCValueSet >>= \ set ->
-- setter set >>
-- xCreateGC display d set >>= \ gc ->
-- freeGCValueSet set >>
-- return gc
--
-- changeGC :: Display -> Drawable -> GC -> GCSetter -> IO ()
-- changeGC display d gc (GCSetter setter) =
-- emptyGCValueSet >>= \ set ->
-- setter set >>
-- xChangeGC display d set >>= \ gc ->
-- freeGCValueSet set
--
-- instance Monoid GCSetter where
-- (GCSetter m) >>> (GCSetter k)
-- = GCSetter (\ settings -> m settings >> k settings)
-- unit = GCSetter (\ _ -> return ())
--
-- set_Background :: Pixel -> GCSetter
-- set_Background c = GCSetter (setGCBackground c)
--
-- set_Foreground :: Pixel -> GCSetter
-- set_Foreground c = GCSetter (setGCForeground c)
-- ENDH
-- | interface to the X11 library function @XGContextFromGC()@.
foreign import ccall unsafe "HsXlib.h XGContextFromGC"
gContextFromGC :: GC -> GContext
-- | interface to the X11 library function @XFreeGC()@.
foreign import ccall unsafe "HsXlib.h XFreeGC"
freeGC :: Display -> GC -> IO ()
-- | interface to the X11 library function @XFlushGC()@.
foreign import ccall unsafe "HsXlib.h XFlushGC"
flushGC :: Display -> GC -> IO ()
-- | interface to the X11 library function @XCopyGC()@.
foreign import ccall unsafe "HsXlib.h XCopyGC"
copyGC :: Display -> GC -> Mask -> GC -> IO ()
----------------------------------------------------------------
-- End
----------------------------------------------------------------
|
