DIRECTORY
Carets USING [ResumeCarets, SuspendCarets],
ColorWorld USING [NewContext],
Graphics USING [black, ClipBox, Context, DrawBox, DrawRope,
FontRef, Mark, NewContext, nullMark, PaintMode, Restore, Save,
Scale, SetColor, SetCP, SetDefaultFont, SetPaintMode, Translate, white],
GraphicsOps USING [Disable],
IconManager USING [selectedIcon],
Icons USING [DrawIcon],
Menus USING [],
MenusPrivate USING [DrawMenu],
Process USING [Detach, GetCurrent, MsecToTicks, Pause, Ticks],
Rope USING [ROPE],
VFonts USING [defaultFont, defaultGFont, StringWidth],
ViewerOps,
ViewerClasses,
ViewerLocks USING [CallUnderReadLock, CallUnderWriteLock, ColumnWedged, Wedged], 
ViewerSpecs,
ViewersStallNotifier,
ViewerTools USING [GetSelectedViewer];

ViewerPaintImpl: CEDAR MONITOR

IMPORTS Carets, ColorWorld, Graphics, GraphicsOps, IconManager, Icons, MenusPrivate, Process, VFonts, ViewerLocks, ViewerTools, ViewerOps, ViewerSpecs
EXPORTS ViewerOps, ViewersStallNotifier
SHARES Menus, ViewerClasses, ViewerLocks =

BEGIN OPEN Graphics, ViewerClasses, ViewerOps, ViewerSpecs;

InvisiblePaint: PUBLIC SIGNAL = CODE;

PaintDocumentHeader: PROC [viewer: Viewer, context: Context, clear: BOOL, hint: PaintHint, whatChanged: REF ANY] =
BEGIN OPEN viewer;
wbs: INTEGER = IF viewer.border THEN windowBorderSize ELSE 0;
ClipBox[context, [wx, wy, wx+ww, wy+wh]];
IF hint#menu THEN BEGIN
IF viewer.class.caption#NIL THEN BEGIN	-- client-painted caption
mark: Mark _ Save[context];
ClipBox[context, [wx+wbs, wy+wh-captionHeight-wbs, wx+ww-(2*wbs),
wy+wh-wbs]];
viewer.class.caption[viewer, context];
Restore[context, mark];
END
ELSE BEGIN
headerW: INTEGER _ VFonts.StringWidth[name];
IF viewer.saveInProgress THEN headerW _ headerW + sipW
ELSE IF viewer.newFile THEN headerW _ headerW + newFW
ELSE IF viewer.newVersion THEN headerW _ headerW + newVW;
IF viewer.link#NIL THEN headerW _ headerW + linkW;
headerW _ MIN[headerW, ww];
DrawBox[context, XYWH2Box[wx, wy+wh-captionHeight, ww, captionHeight]];
SetColor[context, white];
SetCP[context, wx+((ww-headerW)/2), wy+wh-captionHeight+4];
DrawRope[context, name];
IF viewer.saveInProgress THEN DrawRope[context, sipT]
ELSE IF viewer.newFile THEN DrawRope[context, newFT]
ELSE IF viewer.newVersion THEN DrawRope[context, newVT];
IF viewer.link#NIL THEN DrawRope[context, linkT];
END;
END;
IF menu#NIL AND hint#caption THEN BEGIN
height: INTEGER _ menu.linesUsed*menuHeight;
IF whatChanged=NIL THEN BEGIN
IF ~clear THEN BEGIN
SetColor[context, white];
DrawBox[context, XYWH2Box[wx+wbs, wy+wh-captionHeight-height,
ww-(2*wbs), height]];
END;
SetColor[context, black];
DrawBox[context, XYWH2Box[wx, wy+wh-captionHeight-height-windowBorderSize,
ww, menuBarHeight]];
END;
MenusPrivate.DrawMenu[viewer.menu, context, wx+wbs,
wy+wh-menuHeight-captionHeight, whatChanged];
END;
END;

PaintIcon: PROC [viewer: Viewer, hint: PaintHint, whatChanged: REF ANY _ NIL] = BEGIN
context: Context;
label: Rope.ROPE;

IF viewer.parent#NIL THEN RETURN;

context _ AcquireContext[viewer, FALSE];	-- all icons on b&w display

IF viewer.icon=private THEN viewer.class.paint[viewer, context, whatChanged, hint=all]

ELSE IF hint=all OR hint=caption THEN BEGIN
mark: Mark _ Save[context];	-- since Icons.DrawIcon will set clipper
IF viewer.icon=document AND (viewer.newVersion OR viewer.newFile) THEN
viewer.icon _ dirtyDocument
ELSE IF viewer.icon=dirtyDocument AND NOT (viewer.newVersion OR viewer.newFile) THEN
viewer.icon _ document;
label _ NARROW[ViewerOps.FetchProp[viewer, $IconLabel]];
IF label = NIL THEN label _ viewer.name;
Icons.DrawIcon[flavor: viewer.icon, context: context, label: label];
Restore[context, mark];
IF IconManager.selectedIcon=viewer THEN BEGIN
[] _ SetPaintMode[context, invert];
DrawBox[context, [0, 0, iconWidth, iconHeight]];
END;
END;

ReleaseContext[context];
END;

SetIconLabel: PUBLIC PROC [viewer: Viewer, label: Rope.ROPE] = BEGIN
ViewerOps.AddProp[viewer, $IconLabel, label];
END;

RecursivelyPaintViewers: PROC [viewer: Viewer, hint: PaintHint, clearClient: BOOL,
clear: BOOL, rect: PaintRectangle, whatChanged: REF ANY] = BEGIN OPEN viewer;
vx, vy: INTEGER;
context: Context _ NIL;
bitmapY: INTEGER _ 0;

FOR v: Viewer _ viewer, v.parent UNTIL v=NIL DO	-- visibility test
IF v.parent#NIL THEN BEGIN
IF (v.wy+v.wh < 0) OR (v.wy > v.parent.ch) THEN RETURN;
IF (v.ww+v.ww < 0) OR (v.wx > v.parent.cw) THEN RETURN;
END
ENDLOOP;

IF hint#client THEN BEGIN
ENABLE UNWIND => IF context#NIL THEN ReleaseContext[context];
context _ AcquireContext[parent, viewer.column=color];
IF ~viewer.visible OR viewer.destroyed THEN SIGNAL InvisiblePaint;
IF clearClient AND ~clear AND hint=all THEN BEGIN
SetColor[context, white];
DrawBox[context, XYWH2Box[wx, wy, ww, wh]];
SetColor[context, black];
clear _ TRUE;
END;
IF border AND hint=all THEN BEGIN
wbs: INTEGER ~ windowBorderSize;
DrawBox[context, XYWH2Box[wx, wy, ww, wbs]];
DrawBox[context, XYWH2Box[wx, wy, wbs, wh]];
DrawBox[context, XYWH2Box[wx+ww-wbs, wy, wbs, wh]];
DrawBox[context, XYWH2Box[wx, wy+wh-wbs, ww, wbs]];
END;
IF parent=NIL AND viewer.column#static 
THEN PaintDocumentHeader[viewer, context, clear, hint, whatChanged];
ReleaseContext[context];
END;

IF hint=all OR hint=client THEN BEGIN
ENABLE UNWIND => IF context#NIL THEN ReleaseContext[context];
context _ NIL; context _ AcquireContext[viewer, viewer.column=color];
IF ~viewer.visible OR viewer.destroyed THEN SIGNAL InvisiblePaint;
IF rect#NIL AND class.bltContents = none THEN clearClient _ TRUE;
IF clearClient AND ~clear THEN BEGIN
SetColor[context, white];
DrawBox[context, [0, 0, cw, ch]];
SetColor[context, black];
IF rect # NIL THEN whatChanged _ NIL;
rect _ NIL;
clear _ TRUE;
END;
IF class.paint#NIL THEN class.paint[viewer, context, whatChanged, clear];
ReleaseContext[context];
END;

IF rect # NIL AND viewer.parent = NIL THEN {  
IF viewer.cx >= rect.x AND (viewer.cx + viewer.cw <= rect.x + rect.w) AND
viewer.cy >= rect.y AND (viewer.cy + viewer.ch <= rect.y + rect.h) THEN RETURN};

IF hint=all OR hint=client OR clear THEN
FOR v: Viewer _ viewer.child, v.sibling UNTIL v=NIL DO
IF rect # NIL THEN { -- don't paint if it is completely within the blt 
-- map to the coodinate system that rect uses
IF viewer.class.coordSys = top 
THEN [vx, vy] _ ViewerOps.UserToScreenCoords[viewer, v.wx, v.wy+v.wh]
ELSE [vx, vy] _ ViewerOps.UserToScreenCoords[viewer, v.wx, v.wy];
IF vx >= rect.x AND (vx + v.ww <= rect.x + rect.w) AND
vy >= rect.y AND (vy + v.wh <= rect.y + rect.h) THEN LOOP};
RecursivelyPaintViewers[v, all, FALSE, clear, rect, whatChanged];
ENDLOOP;

END;

PaintViewer: PUBLIC PROC [viewer: Viewer, hint: PaintHint _ client, clearClient: BOOL _ TRUE,
whatChanged: REF ANY _ NIL] = BEGIN
LocalPaintViewer: PROC  = {
ENABLE ABORTED => {Carets.ResumeCarets[]; CONTINUE};
rect: PaintRectangle;
IF ~viewer.visible OR viewer.destroyed THEN RETURN;
IF viewer.iconic THEN {PaintIcon[viewer, hint, whatChanged]; RETURN};
Carets.SuspendCarets[];
IF ISTYPE[whatChanged, PaintRectangle] THEN rect _ NARROW[whatChanged];
RecursivelyPaintViewers[viewer, hint, clearClient AND ~(hint=menu OR hint=caption),
FALSE, rect, whatChanged ! InvisiblePaint => CONTINUE];
Carets.ResumeCarets[]};
ViewerLocks.CallUnderReadLock[LocalPaintViewer, viewer ! ViewerLocks.Wedged => CONTINUE];
END;


PaintVector: TYPE = REF PaintVectorRec;
PaintVectorRec: TYPE = RECORD [
next: PaintVector _ NIL,
viewer: Viewer _ NIL,
inUse: BOOL _ FALSE,
resetOnRelease: BOOL _ FALSE,
color: BOOL _ FALSE,
mark: Graphics.Mark _ nullMark,
process: UNSAFE PROCESS _ NIL,
context: Context _ NIL,
previous: PaintVector _ NIL];

nVectors: CARDINAL = 5;
usedVectors: CARDINAL _ 0;
PaintVectorAvailable: CONDITION;
paintingLock: CARDINAL _ 0;

vectorRoot: PaintVector _ NIL;
colorVector: PaintVector _ NIL;

Init: ENTRY PROC = BEGIN
new: PaintVector;
FOR n: CARDINAL IN [0..nVectors) DO
new _ NEW[PaintVectorRec];
new.context _ NewContext[];
SetDefaultFont[new.context, VFonts.defaultGFont];
new.next _ vectorRoot;
IF vectorRoot#NIL THEN vectorRoot.previous _ new;
vectorRoot _ new;
ENDLOOP;
newFW _ VFonts.StringWidth[newFT];
newVW _ VFonts.StringWidth[newVT];
linkW _ VFonts.StringWidth[linkT];
sipW _ VFonts.StringWidth[sipT];
colorVector _ NEW[PaintVectorRec];
colorVector.color _ TRUE;
END;

colorInit: BOOL _ FALSE;

InitialiseColorPainting: PUBLIC PROC = BEGIN
ColorCriticalInit: ENTRY PROC = BEGIN
colorVector.context _ ColorWorld.NewContext[];
SetDefaultFont[colorVector.context, VFonts.defaultGFont];
colorInit _ TRUE;
END;
ColorCriticalInit[];
ViewerOps.GreyScreen[0, 0, 9999, 9999, TRUE, FALSE];
END;

ZapVector: INTERNAL PROC [p: PaintVector] = BEGIN
oldContext: Context _ p.context;
p.context _ IF p.color THEN ColorWorld.NewContext[] ELSE NewContext[];
Graphics.SetDefaultFont[p.context, VFonts.defaultGFont];
p.viewer _ NIL;
p.inUse _ FALSE;
p.process _ NIL;
p.mark _ nullMark;
IF ~p.color THEN usedVectors _ usedVectors - 1;
GraphicsOps.Disable[oldContext];	-- smash old
BROADCAST PaintVectorAvailable;
END;

UnWedgePainter: PUBLIC ENTRY PROC [process: PROCESS, kind: ATOM] = BEGIN
ENABLE UNWIND => NULL;
IF colorVector.inUse AND colorVector.process=process THEN ZapVector[colorVector]
ELSE FOR p: PaintVector _ vectorRoot, p.next UNTIL p=NIL DO
IF p.inUse AND p.process=process THEN ZapVector[p];
ENDLOOP;
END;

UnWedge: ENTRY PROC [process: PROCESS, kind: ATOM] = BEGIN
IF colorVector.inUse THEN ZapVector[colorVector]
ELSE FOR p: PaintVector _ vectorRoot, p.next UNTIL p=NIL DO
IF p.inUse THEN ZapVector[p];
ENDLOOP;
usedVectors _ 0;	-- make sure
paintingLock _ 0;	-- make sure
BROADCAST PaintVectorAvailable;
END;

DisablePainting: PUBLIC ENTRY PROC [wait: BOOL _ TRUE] = BEGIN
ENABLE UNWIND => NULL;
InternalDisablePainting[wait];
END;
InternalDisablePainting: INTERNAL PROC [wait: BOOL _ TRUE] = INLINE BEGIN
IF wait THEN
WHILE usedVectors#0 OR colorVector.inUse DO WAIT PaintVectorAvailable; 
ENDLOOP;
paintingLock _ paintingLock+1;
END;

EnablePainting: PUBLIC ENTRY PROC = BEGIN
ENABLE UNWIND => NULL;
InternalEnablePainting[];
END;
InternalEnablePainting: INTERNAL PROC = INLINE BEGIN
IF paintingLock#0 THEN paintingLock _ paintingLock-1;
IF paintingLock=0 THEN BROADCAST PaintVectorAvailable;
END;

DisablePaintingUnWedged: INTERNAL PROC [wait: BOOL _ TRUE] = INLINE BEGIN
AllWedged: INTERNAL PROC RETURNS[BOOL] = INLINE BEGIN
IF colorVector.inUse THEN BEGIN
IF colorVector.viewer=NIL THEN RETURN[FALSE]; -- context = screen
IF ~ViewerLocks.ColumnWedged[color].wedged THEN RETURN[FALSE];
END;
FOR p: PaintVector _ vectorRoot, p.next UNTIL p=NIL DO
IF ~p.inUse THEN LOOP;
IF p.viewer = NIL THEN RETURN[FALSE]; -- context = screen
IF ~ViewerLocks.ColumnWedged[ViewerColumn[p.viewer]].wedged THEN RETURN[FALSE];
ENDLOOP;
RETURN[TRUE];
END;

IF wait THEN
WHILE usedVectors#0 OR colorVector.inUse DO 
IF AllWedged[] THEN EXIT ELSE WAIT PaintVectorAvailable; 
ENDLOOP;
paintingLock _ paintingLock+1;
END;

WaitForPaintingToFinish: PUBLIC ENTRY PROC = BEGIN
WHILE usedVectors#0 AND colorVector.inUse DO WAIT PaintVectorAvailable ENDLOOP;
END;

ResetPaintCache: PUBLIC ENTRY PROC [viewer: Viewer _ NIL, wait: BOOL _ TRUE] = BEGIN
ENABLE UNWIND => NULL;
DisablePaintingUnWedged[wait];
FOR p: PaintVector _ vectorRoot, p.next UNTIL p=NIL DO
IF p.inUse THEN BEGIN
IF p.viewer = NIL OR ~ViewerLocks.ColumnWedged[ViewerColumn[p.viewer]].wedged 
THEN IF wait THEN RETURN WITH ERROR fatalViewersError;
p.resetOnRelease _ TRUE;
END
ELSE IF p.viewer#NIL THEN BEGIN
ResetContext[p.context];
p.viewer _ NIL;
END;
ENDLOOP;
IF colorVector.context#NIL THEN BEGIN
IF colorVector.inUse AND ~ViewerLocks.ColumnWedged[color].wedged THEN BEGIN
IF wait THEN RETURN WITH ERROR fatalViewersError;
colorVector.resetOnRelease _ TRUE;
END
ELSE IF colorVector.viewer#NIL THEN BEGIN
ResetContext[colorVector.context];
colorVector.viewer _ NIL;
END;
END;
InternalEnablePainting[];
END;

fatalViewersError: ERROR = CODE;

ReleaseContext: PUBLIC ENTRY PROC [free: Context] = BEGIN
ENABLE UNWIND => NULL;
CleanUp: INTERNAL PROC [p: PaintVector] = BEGIN
Restore[free, p.mark];	-- throw away any client changes
p.inUse _ FALSE;
p.mark _ nullMark;
IF ~p.color THEN {IF usedVectors=0 THEN RETURN WITH ERROR fatalViewersError
ELSE usedVectors _ usedVectors-1};
IF p.resetOnRelease THEN BEGIN
ResetContext[p.context];
p.viewer _ NIL;
p.resetOnRelease _ FALSE;
END;
p.process _ NIL;
BROADCAST PaintVectorAvailable;
END;
IF free=NIL THEN RETURN WITH ERROR fatalViewersError;
IF free=colorVector.context THEN CleanUp[colorVector]
ELSE FOR p: PaintVector _ vectorRoot, p.next UNTIL p=NIL DO
IF free=p.context THEN {CleanUp[p]; EXIT};
ENDLOOP;
END;

AcquireContext: PUBLIC ENTRY PROC [viewer: Viewer, color: BOOL _ FALSE]
RETURNS [allocated: Context] = BEGIN
ENABLE UNWIND => NULL;
bestFit: PaintVector;
nil: BOOL _ FALSE;

MakeFirst: INTERNAL PROC [pv: PaintVector] = INLINE BEGIN	-- LRU caching scheme
IF pv=vectorRoot THEN RETURN;
pv.previous.next _ pv.next;
IF pv.next#NIL THEN pv.next.previous _ pv.previous;
pv.next _ vectorRoot;
vectorRoot.previous _ pv;
vectorRoot _ pv;
END;

IF color THEN BEGIN
IF ~colorInit THEN ERROR fatalViewersError;
WHILE colorVector.inUse OR paintingLock#0 DO WAIT PaintVectorAvailable; ENDLOOP;
IF viewer#NIL AND (~viewer.visible OR viewer.destroyed) THEN
SIGNAL InvisiblePaint;	-- someone got changed while waiting in the loop above
bestFit _ colorVector;
END

ELSE BEGIN
UNTIL usedVectors<nVectors AND paintingLock=0 DO WAIT PaintVectorAvailable; ENDLOOP;
IF viewer#NIL AND (~viewer.visible OR viewer.destroyed) THEN
SIGNAL InvisiblePaint;	-- someone got changed while waiting in the loop above
FOR p: PaintVector _ vectorRoot, p.next UNTIL p=NIL DO
IF p.inUse THEN LOOP;
IF viewer=p.viewer THEN {bestFit _ p; EXIT}
ELSE IF p.viewer=NIL THEN {bestFit _ p; nil _ TRUE}
ELSE IF ~nil THEN bestFit _ p;
ENDLOOP;
usedVectors _ usedVectors+1;
MakeFirst[bestFit];
END;

bestFit.inUse _ TRUE;
TRUSTED {bestFit.process _ Process.GetCurrent[]};
SetContext[viewer, bestFit];
bestFit.mark _ Save[allocated _ bestFit.context];	-- protect context
END;

SetContext: INTERNAL PROC [viewer: Viewer, paintVector: PaintVector] = BEGIN
pViewer: Viewer = paintVector.viewer;
pContext: Context = paintVector.context;

RecursivelyPushParent: INTERNAL PROC [viewer: Viewer] = BEGIN
IF viewer.parent#NIL THEN RecursivelyPushParent[viewer.parent];
PushContext[viewer, pContext]
END;

SELECT TRUE FROM	-- try to efficiently set up client context
pViewer=viewer			=> NULL;
viewer=NIL				=> ResetContext[pContext];
pViewer=viewer.parent	=> PushContext[viewer, pContext];
pViewer=NIL				=> RecursivelyPushParent[viewer];
pViewer.destroyed		=> {ResetContext[pContext]; RecursivelyPushParent[viewer]};
pViewer.parent=viewer	=> PopContext[pContext];
pViewer.parent=viewer.parent	=> {PopContext[pContext]; PushContext[viewer, pContext]};
ENDCASE					=> {ResetContext[pContext]; RecursivelyPushParent[viewer]};

paintVector.viewer _ viewer;
END;

PushContext: INTERNAL PROC [viewer: Viewer, context: Context] = BEGIN OPEN viewer;
invertCoords: BOOL = IF viewer.parent=NIL THEN viewer.class.coordSys=top
ELSE viewer.class.coordSys#viewer.parent.class.coordSys;
[] _ Save[context];
IF viewer.iconic THEN BEGIN
IF wy+wh > openBottomY THEN ClipIcon[context];
ClipBox[context, XYWH2Box[wx, wy, ww, wh]];
Translate[context, wx, wy];
END
ELSE IF invertCoords THEN BEGIN
ClipBox[context, XYWH2Box[cx, cy, cw, ch]];
Translate[context, cx, cy+ch];
Scale[context, 1, -1];
END
ELSE BEGIN
ClipBox[context, XYWH2Box[cx, cy, cw, ch]];
Translate[context, cx, cy];
END;
END;

PopContext: INTERNAL PROC [context: Context] = INLINE BEGIN
Restore[context];
END;

ResetContext: INTERNAL PROC [context: Context] = INLINE BEGIN
screen: Mark = LOOPHOLE[0];
Restore[context, screen];
END;

InvertForMenus: PUBLIC PROC [viewer: Viewer, x,y: INTEGER, w,h: INTEGER] = BEGIN
context: Context;
context _ AcquireContext[viewer.parent, viewer.column=color];
[] _ SetPaintMode[context, invert];
DrawBox[context, ViewerOps.XYWH2Box[viewer.wx+x, y, w, h]];
ReleaseContext[context];
END;

ClipIcon: PROC [context: Context] = BEGIN
ClipOpenViewer: ViewerOps.EnumProc = BEGIN
IF ~v.iconic AND (v.column=right OR v.column=left) THEN
Graphics.ClipBox[context, [v.wx, v.wy, v.wx+v.ww, v.wy+v.wh], TRUE];
END;
ViewerOps.EnumerateViewers[ClipOpenViewer];
END;

BlinkIcon: PUBLIC PROC [viewer: Viewer, count, interval: NAT] = BEGIN
IF interval >= 1000 THEN interval _ interval/1000;
IF viewer.offDeskTop THEN ViewerOps.ChangeColumn[viewer, left];
IF count = 1 THEN BlinkProcess[viewer, count, interval]
ELSE TRUSTED {Process.Detach[FORK BlinkProcess[viewer, count, interval]]};
END;

BlinkProcess:  PROC [viewer: Viewer, count, n: NAT] = BEGIN
howOften: Process.Ticks = Process.MsecToTicks[500];
Blink: PROC = BEGIN OPEN viewer;
context: Context;
IF NOT visible OR destroyed THEN RETURN;
context _ AcquireContext[viewer, IF iconic THEN FALSE ELSE column=color];
[] _ SetPaintMode[context, invert];
DrawBox[context, ViewerOps.XYWH2Box[0, 0, viewer.ww, viewer.wh]];
Process.Pause[Process.MsecToTicks[400]];
DrawBox[context, ViewerOps.XYWH2Box[0, 0, viewer.ww, viewer.wh]];
ReleaseContext[context];
Process.Pause[Process.MsecToTicks[350]];	-- so can be called back-to-back
END;

DO
ViewerLocks.CallUnderWriteLock[Blink, viewer];
IF count = 1 THEN RETURN;
IF count > 0 THEN count _ count - 1;
FOR i: NAT IN [0..2*n) DO  -- blink every n seconds, but wake up every half second.
Process.Pause[howOften];
IF viewer.destroyed OR ~viewer.iconic 
OR viewer = ViewerTools.GetSelectedViewer[] THEN RETURN;
ENDLOOP;
ENDLOOP;
END;


newVT: Rope.ROPE = "  [New Version]";
newVW: INTEGER;

newFT: Rope.ROPE = "  [New File]";
newFW: INTEGER;

linkT: Rope.ROPE = "  [Split]";
linkW: INTEGER;

sipT: Rope.ROPE = "  [Saving...]";
sipW: INTEGER;

Init[];

ViewerOps.GreyScreen[0, 0, 9999, 9999, FALSE, FALSE];

END.



ϊViewerPaintImpl.mesa; written by S. McGregor
Edited by McGregor on May 2, 1983 11:11 am
Edited by Maxwell, June 3, 1983 8:23 am

IF flavor is private then client wants to draw the icon
do we need to paint any of the children?
recursively paint children
these guys should be painted in reverse order for correct overlaps
call from debugger
broadcast since all are likely to be free
assumes interesting paints already in progress
clips for overlapping top level windows given valid Context and Viewer
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