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|
(* bitmap.sml
*
* COPYRIGHT (c) 1996 AT&T Research.
*)
signature BITMAP =
sig
structure W : WIDGET
structure CML : CONCUR_ML
exception BadParam
type bitmap
val mkBitmap : W.root -> {
backgrnd : W.EXB.color option,
foregrnd : W.EXB.color option,
horzCells : int,
vertCells : int
} -> bitmap
val widgetOf : bitmap -> W.widget
val setPixel : bitmap -> (bool * W.G.point) -> unit
val imageOf : bitmap -> W.EXB.image
end
structure Bitmap : BITMAP =
struct
structure W = Widget
structure CML = CML
structure EXB = EXeneBase
open CML Geometry EXeneBase EXeneWin Interact Drawing Widget
exception BadParam
type pixchange = bool * point
datatype rqst =
DoRealize of {
env : in_env,
win : window,
sz : size
}
| Set of pixchange
| ImageOf of image chan
datatype bitmap = BM of {widget : widget, setChan : rqst chan}
fun setColor scr (SOME c, _) = c
| setColor scr (NONE, dflt) = dflt
fun mkBitmap root {horzCells, vertCells, foregrnd, backgrnd} = let
val scr = screenOf root
val setChan = channel ()
val psize = SIZE{wid=horzCells,ht=vertCells}
val pixMap = createPixmap scr (psize,1)
val pm = drawableOfPM pixMap
val prect = mkRect(originPt,psize)
val _ = clearDrawable pm
val size = fixBounds (horzCells, vertCells)
val maxX = horzCells-1
val maxY = vertCells-1
val forec = setColor scr (foregrnd, blackOfScr scr)
val backc = setColor scr (backgrnd, whiteOfScr scr)
val onPen = newPen [PV_Foreground color1]
val offPen = newPen [PV_Foreground color0]
val copyPen = newPen [PV_Foreground forec, PV_Background backc]
fun set (true, pt) = drawPt pm onPen pt
| set (false, pt) = drawPt pm offPen pt
fun blt dw r = bitBlt dw copyPen {src=PMSRC pixMap, src_rect=r, dst_pos=originOfRect r}
fun redraw(dw,rlist) = app (blt dw) rlist
fun sendImage rchan = send(rchan, createImageFromPixmap pixMap)
fun realize {env, win, sz} = let
val InEnv{ci,...} = ignoreInput env
val mChan = channel ()
val dw = drawableOfWin win
fun handleCI (CI_Resize (RECT{x,y,wid,ht})) = ()
| handleCI (CI_Redraw rlist) = (redraw (dw,rlist); ())
| handleCI CI_OwnDeath = ()
| handleCI _ = ()
fun handleSet (DoRealize _) = ()
| handleSet (ImageOf arg) = (sendImage arg; ())
| handleSet (Set arg) = (set arg; redraw(dw,[prect]); ())
fun loop () =
loop(select [
wrap (ci, fn evt => (handleCI (msgBodyOf evt))),
wrap (receive setChan, fn evt => (handleSet evt))
])
in
loop ()
end
fun initLoop () =
case (accept setChan) of
DoRealize arg => realize arg
| Set arg => (set arg; initLoop ())
| ImageOf arg => (sendImage arg; initLoop ())
in
spawn initLoop;
BM {
widget = mkWidget{
root=root,
boundsOf = fn () => size,
realize= fn arg => send(setChan, DoRealize arg)
},
setChan = setChan
}
end
fun widgetOf (BM{widget,...}) = widget
fun setPixel (BM{setChan,...}) arg = send(setChan,Set arg)
fun imageOf (BM{setChan,...}) = let
val retChan = channel ()
in
send(setChan,ImageOf retChan);
accept retChan
end
end
|
