DIRECTORY
Carets USING [ResumeCarets, SuspendCarets],
IconManager USING [selectedIcon],
Icons USING [DrawIcon],
Imager USING [black, ClipView, Context, Create, DoSave, IntegerClipRectangle, IntegerMaskRectangle, IntegerSetXY, Reset, SetColor, SetView, ShowCharacters, TranslateT, white, XOR],
MenusPrivate USING [DrawMenu, ViewerMenus],
Process USING [Detach, GetCurrent, MsecToTicks, Pause, Ticks],
Rope USING [ROPE],
VFonts USING [defaultFont, FONT, RopeWidth],
ViewerOps USING [AddProp, ChangeColumn, EnumerateViewers, EnumProc, FetchProp, GreyScreen, PaintHint, UserToScreenCoords, ViewerColumn],
ViewerClasses USING [PaintRectangle, Viewer],
ViewerLocks USING [CallUnderReadLock, CallUnderWriteLock, ColumnWedged, Wedged], 
ViewerSpecs USING [captionDescent, captionHeight, iconHeight, iconWidth, menuBarHeight, openBottomY, windowBorderSize],
ViewersStallNotifier USING [],
ViewerTools USING [GetSelectedViewer];

ViewerPaintImpl: CEDAR MONITOR
IMPORTS Carets, Imager, IconManager, Icons, MenusPrivate, Process, VFonts, ViewerLocks, ViewerTools, ViewerOps, ViewerSpecs
EXPORTS ViewerOps, ViewersStallNotifier
SHARES ViewerClasses, ViewerLocks
= BEGIN OPEN ViewerSpecs;

Viewer: TYPE = ViewerClasses.Viewer;
PaintRectangle: TYPE = ViewerClasses.PaintRectangle;
PaintHint: TYPE = ViewerOps.PaintHint;
Context: TYPE = Imager.Context;
ROPE: TYPE = Rope.ROPE;

InvisiblePaint: PUBLIC SIGNAL = CODE;

PaintCaption: PROC[viewer: Viewer, context: Context] = {
IF viewer.class.caption#NIL THEN { -- client-painted caption
CallClient: PROC = {
wbs: INTEGER = IF viewer.border THEN windowBorderSize ELSE 0;
Imager.IntegerClipRectangle[context,
viewer.wx+wbs, viewer.wy+viewer.wh-wbs-captionHeight,
viewer.ww-(2*wbs), captionHeight];
viewer.class.caption[viewer, context];
};
Imager.DoSave[context, CallClient];
}
ELSE {
font: VFonts.FONT = VFonts.defaultFont;
headerW: INTEGER _ VFonts.RopeWidth[viewer.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, viewer.ww];
Imager.IntegerMaskRectangle[context,
viewer.wx, viewer.wy+viewer.wh-captionHeight, viewer.ww, captionHeight];
Imager.SetColor[context, Imager.white];
Imager.IntegerSetXY[context,
viewer.wx+(viewer.ww-headerW)/2,
viewer.wy+viewer.wh-captionHeight+captionDescent];
Imager.ShowCharacters[context, viewer.name, font];
IF viewer.saveInProgress THEN Imager.ShowCharacters[context, sipT, font]
ELSE IF viewer.newFile THEN Imager.ShowCharacters[context, newFT, font]
ELSE IF viewer.newVersion THEN Imager.ShowCharacters[context, newVT, font];
IF viewer.link#NIL THEN Imager.ShowCharacters[context, linkT, font];
};
};

PaintDocumentHeader: PROC[viewer: Viewer, context: Context, clear: BOOL, hint: PaintHint, whatChanged: REF ANY] = {
Imager.IntegerClipRectangle[context, viewer.wx, viewer.wy, viewer.ww, viewer.wh];
IF hint#menu THEN PaintCaption[viewer, context];
IF viewer.menus#NIL AND hint#caption THEN {
menus: MenusPrivate.ViewerMenus = NARROW[viewer.menus];
menuHeight: INTEGER = menus.h;
wbs: INTEGER = IF viewer.border THEN windowBorderSize ELSE 0;
IF whatChanged=NIL THEN {
IF ~clear THEN {
Imager.SetColor[context, Imager.white];
Imager.IntegerMaskRectangle[context,
viewer.wx+wbs, viewer.wy+viewer.wh-wbs-captionHeight-menuHeight,
viewer.ww-(2*wbs), menuHeight];
};
Imager.SetColor[context, Imager.black];
Imager.IntegerMaskRectangle[context,
viewer.wx, viewer.wy+viewer.wh-wbs-captionHeight-menuHeight,
viewer.ww, menuBarHeight];
};
MenusPrivate.DrawMenu[viewer, menus, context, whatChanged];
};
};

PaintIcon: PROC[viewer: Viewer, hint: PaintHint, whatChanged: REF ANY _ NIL] = {
context: Context;
IF viewer.parent#NIL THEN RETURN;
context _ AcquireContext[viewer, FALSE];	-- all icons on b&w display

IF viewer.icon=private THEN -- client wants to draw the icon
viewer.class.paint[viewer, context, whatChanged, hint=all]
ELSE IF hint=all OR hint=caption THEN {
label: ROPE = GetIconLabel[viewer];
DrawIcon: PROC = {Icons.DrawIcon[flavor: viewer.icon, context: context, label: label]};
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;
Imager.DoSave[context, DrawIcon];
IF IconManager.selectedIcon=viewer THEN {
Imager.SetColor[context, Imager.XOR];
Imager.IntegerMaskRectangle[context, 0, 0, iconWidth, iconHeight];
};
};

ReleaseContext[context];
};

SetIconLabel: PUBLIC PROC[viewer: Viewer, label: ROPE] = {
ViewerOps.AddProp[viewer, $IconLabel, label];
};

GetIconLabel: PROC[viewer: Viewer] RETURNS[label: ROPE] = {
prop: REF ANY = ViewerOps.FetchProp[viewer, $IconLabel];
IF prop#NIL THEN RETURN[NARROW[prop]]
ELSE RETURN[viewer.name];
};

RecursivelyPaintViewers: PROC [viewer: Viewer, hint: PaintHint, clearClient: BOOL,
clear: BOOL, rect: PaintRectangle, whatChanged: REF ANY] = {
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 {
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;
}
ENDLOOP;

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

IF hint=all OR hint=client THEN {
ENABLE UNWIND => IF context#NIL THEN ReleaseContext[context];
PaintClient: PROC = {viewer.class.paint[viewer, context, whatChanged, clear]};
context _ NIL; context _ AcquireContext[viewer, viewer.column=color];
IF ~viewer.visible OR viewer.destroyed THEN SIGNAL InvisiblePaint;
IF rect#NIL AND rect.flavor=blt AND viewer.class.bltContents = none THEN
clearClient _ TRUE;
IF clearClient AND ~clear THEN {
Imager.SetColor[context, Imager.white];
Imager.IntegerMaskRectangle[context, 0, 0, viewer.cw, viewer.ch];
Imager.SetColor[context, Imager.black];
IF rect # NIL THEN whatChanged _ NIL;
rect _ NIL;
clear _ TRUE;
};
IF viewer.class.paint#NIL THEN {
IF viewer.clientContext THEN PaintClient[] ELSE Imager.DoSave[context, PaintClient];
};
ReleaseContext[context];
};

IF rect # NIL AND rect.flavor=blt 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 clear THEN
FOR v: Viewer _ viewer.child, v.sibling UNTIL v=NIL DO
IF rect # NIL AND rect.flavor=blt THEN { -- don't paint if it is completely within the blt 
[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;

};

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


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

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

vectorRoot: PaintVector _ NIL;

Init: ENTRY PROC = {
new: PaintVector;
FOR n: CARDINAL IN [0..nVectors) DO
new _ NEW[PaintVectorRec];
new.context _ Imager.Create[$LFDisplay];
new.next _ vectorRoot;
IF vectorRoot#NIL THEN vectorRoot.previous _ new;
vectorRoot _ new;
ENDLOOP;
newFW _ VFonts.RopeWidth[newFT];
newVW _ VFonts.RopeWidth[newVT];
linkW _ VFonts.RopeWidth[linkT];
sipW _ VFonts.RopeWidth[sipT];
};

colorInit: BOOL _ FALSE;

InitialiseColorPainting: PUBLIC PROC = {
colorInit _ TRUE;
ViewerOps.GreyScreen[0, 0, 9999, 9999, TRUE, FALSE];
};

ZapVector: INTERNAL PROC [p: PaintVector] = {
oldContext: Context _ p.context;
p.context _ Imager.Create[$LFDisplay];
p.viewer _ NIL;
p.inUse _ FALSE;
p.process _ NIL;
IF ~p.color THEN usedVectors _ usedVectors - 1;
Imager.SetView[oldContext, [0,0,0,0]]; -- smash old
BROADCAST PaintVectorAvailable;
};

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

UnWedge: ENTRY PROC [process: PROCESS, kind: ATOM] = {
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;
};

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

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

DisablePaintingUnWedged: INTERNAL PROC [wait: BOOL _ TRUE] = INLINE {
AllWedged: INTERNAL PROC RETURNS[BOOL] = INLINE {
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[ViewerOps.ViewerColumn[p.viewer]].wedged THEN RETURN[FALSE];
ENDLOOP;
RETURN[TRUE];
};

IF wait THEN {
WHILE usedVectors#0 DO 
IF AllWedged[] THEN EXIT ELSE WAIT PaintVectorAvailable; 
ENDLOOP;
};
paintingLock _ paintingLock+1;
};

WaitForPaintingToFinish: PUBLIC ENTRY PROC = {
WHILE usedVectors#0 DO WAIT PaintVectorAvailable ENDLOOP;
};

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

fatalViewersError: ERROR = CODE;

ReleaseContext: PUBLIC ENTRY PROC [free: Context] = {
ENABLE UNWIND => NULL;
CleanUp: INTERNAL PROC [p: PaintVector] = {
p.inUse _ FALSE;
IF usedVectors=0 THEN RETURN WITH ERROR fatalViewersError
ELSE usedVectors _ usedVectors-1;
IF p.resetOnRelease THEN {
Imager.Reset[p.context];
p.viewer _ NIL;
p.resetOnRelease _ FALSE;
};
p.process _ NIL;
BROADCAST PaintVectorAvailable;
};
IF free=NIL THEN RETURN WITH ERROR fatalViewersError;
FOR p: PaintVector _ vectorRoot, p.next UNTIL p=NIL DO
IF free=p.context THEN {CleanUp[p]; EXIT};
ENDLOOP;
};

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

MakeFirst: INTERNAL PROC [pv: PaintVector] = INLINE {	-- 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;
};

IF color THEN { IF ~colorInit THEN ERROR fatalViewersError };

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

IF viewer#NIL AND viewer.clientContext THEN {	-- private client context
allocated _ NARROW[ViewerOps.FetchProp[viewer, $ViewerClientContext]];
SetContext[viewer, allocated];
RETURN;
};

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];

bestFit.inUse _ TRUE;
TRUSTED {bestFit.process _ Process.GetCurrent[]};
IF viewer#bestFit.viewer THEN SetContext[viewer, bestFit.context];
bestFit.viewer _ viewer;

Imager.SetColor[bestFit.context, Imager.black];	-- since we don't save the color

RETURN[bestFit.context];
};

SetContext: INTERNAL PROC [viewer: Viewer, context: Context] = {
x, y: INTEGER _ 0;
RecursivelyPushParent: INTERNAL PROC [v: Viewer] = {
IF v.parent#NIL THEN RecursivelyPushParent[v.parent];
PushContext[v]
};
PushContext: INTERNAL PROC [v: Viewer] = {
x _ x + v.cx;
y _ y + v.cy;
Imager.ClipView[context, [x, y, v.cw, v.ch], FALSE];
};
Imager.Reset[context];
IF viewer=NIL THEN RETURN
ELSE IF viewer.iconic THEN {
IF viewer.wy+viewer.wh > openBottomY THEN {
ClipIcon[context];
Imager.ClipView[context, [viewer.wx, viewer.wy, viewer.ww, viewer.wh], FALSE];
Imager.TranslateT[context, viewer.wx, viewer.wy];	--xlate since ClipView does no x,y translation
}
ELSE Imager.SetView[context, [viewer.wx, viewer.wy, viewer.ww, viewer.wh]];
}
ELSE IF viewer.parent=NIL THEN {
Imager.SetView[context, [viewer.cx, viewer.cy, viewer.cw, viewer.ch]];
}
ELSE {
RecursivelyPushParent[viewer];
Imager.TranslateT[context, x, y];
};
};

InvertForMenus: PUBLIC PROC [viewer: Viewer, x: INTEGER, y: INTEGER, w: INTEGER, h: INTEGER] = {
context: Context _ AcquireContext[viewer.parent, viewer.column=color];
ActuallyDoDrawing: PROC = {
Imager.IntegerClipRectangle[context, viewer.wx, viewer.wy, viewer.ww, viewer.wh];
Imager.SetColor[context, Imager.XOR];
Imager.IntegerMaskRectangle[context, x, y, w, h];
};
Imager.DoSave[context, ActuallyDoDrawing];
ReleaseContext[context];
};

ClipIcon: PROC [context: Context] = {
ClipOpenViewer: ViewerOps.EnumProc = {
IF ~v.iconic AND (v.column=right OR v.column=left) THEN
Imager.ClipView[context, [v.wx, v.wy, v.ww, v.wh], TRUE];
};
ViewerOps.EnumerateViewers[ClipOpenViewer];
};

BlinkIcon: PUBLIC PROC [viewer: Viewer, count, interval: NAT] = {
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]]};
};

BlinkProcess:  PROC [viewer: Viewer, count, n: NAT] = {
howOften: Process.Ticks = Process.MsecToTicks[500];
Blink: PROC = {
context: Context;
IF NOT viewer.visible OR viewer.destroyed THEN RETURN;
context _ AcquireContext[viewer, IF viewer.iconic THEN FALSE ELSE viewer.column=color];
Imager.SetColor[context, Imager.XOR];
Imager.IntegerMaskRectangle[context, 0, 0, viewer.ww, viewer.wh];
Process.Pause[Process.MsecToTicks[400]];
Imager.IntegerMaskRectangle[context, 0, 0, viewer.ww, viewer.wh];
ReleaseContext[context];
Process.Pause[Process.MsecToTicks[350]];	-- so can be called back-to-back
};
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;
};


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

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

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

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

Init[];

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

END.


ViewerPaintImpl.mesa; written by S. McGregor
Edited by McGregor on August 8, 1983 4:00 pm
Edited by Maxwell, June 3, 1983 8:23 am
Last Edited by: Pausch, August 26, 1983 3:39 pm
Last Edited by: Wyatt, October 24, 1983 12:37 pm

Paint caption:

Paint menu:
Clear the menu area, if necessary
Draw the bar below the menu
do we need to paint any of the children?
recursively paint children
these guys should be painted in reverse order for correct overlaps
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];
call from debugger
broadcast since all are likely to be free
assumes interesting paints already in progress
invert: BOOL _ FALSE;
invertCoords: BOOL = IF v.parent=NIL THEN v.class.coordSys=top
ELSE v.class.coordSys#v.parent.class.coordSys;
IF invert THEN y _ y + v.parent.ch - v.cy - v.ch ELSE
IF invertCoords THEN invert _ ~invert;
IF viewer.class.coordSys=top THEN {
Imager.TranslateT[context, 0, viewer.ch];
Imager.Scale2T[context, 1, -1];
};
IF invert THEN {
Imager.TranslateT[context, x, y+viewer.ch];
Imager.Scale2T[context, 1, -1];
} ELSE
clips for overlapping top level windows given valid Context and Viewer
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