DIRECTORY Imager, ImagerBackdoor, ImagerColor, ImagerPath, IO, Pipal, PipalInt, PipalPaint, PipalReal, Rope, TerminalIO;

PipalPaintImpl: CEDAR MONITOR
LOCKS queue USING queue: Queue
IMPORTS Imager, ImagerBackdoor, ImagerColor, IO, Pipal, PipalInt, PipalReal, Rope, TerminalIO
EXPORTS PipalPaint =
BEGIN OPEN PipalPaint;
debugPrintEnqueued: BOOL _ FALSE; -- When TRUE, prints all enqueued requests
debugPrintDequeued: BOOL _ FALSE; -- When TRUE, prints all dequeued requests
debugOptimize: BOOL _ TRUE;
debugConservativeClip: BOOL _ TRUE; 
debugTestForEmpty: BOOL _ FALSE;
debugClipArea: BOOL _ FALSE; -- set to TRUE to see the area redisplayed!
debugContext: Imager.Context _ NIL;
paintMethod: PUBLIC Pipal.Method _ Pipal.RegisterMethod["Paint"];

Paint: PUBLIC PaintProc = {
data: REF _ Pipal.ObjectMethod[object, paintMethod];
debugContext _ context;
IF data=NIL 
THEN PaintFromEnumerate[object, context] 
ELSE (NARROW [data, REF PaintProc]^)[object, context];
};

PaintFromEnumerate: PaintProc = {
EachChild: PipalReal.EachChildProc = {
TransformAndPaint: PROC = {
Imager.ConcatT[context, transformation];
Paint[child, context];
};
Imager.DoSave[context, TransformAndPaint];
};
transformation: PipalReal.Transformation _ PipalReal.CreateTransformation[];
[] _ PipalReal.Enumerate[object, EachChild, transformation];
PipalReal.DestroyTransformation[transformation];
};
paintMethodProp: PUBLIC ATOM _ $PaintMethodAnnotation;

CreatePaintMethodAnnotation: PUBLIC PROC [child: Pipal.Object, paint: PaintProc] RETURNS [annotation: Pipal.Annotation] = {
annotation _ Pipal.CreateAnnotation[child, paintMethodProp, NEW [PaintProc _ paint]];
};

PaintAnnotation: PaintProc = {
annotation: Pipal.Annotation _ NARROW [object];
paint: PaintProc _ IF annotation.key=paintMethodProp THEN (NARROW [annotation.value, REF PaintProc]^) ELSE Paint;
paint[annotation.child, context];
};

Rectangle: TYPE = PipalReal.Rectangle;
Rectangles: TYPE = LIST OF Rectangle;

enumerateAreaMethod: PUBLIC Pipal.Method _ Pipal.RegisterMethod["EnumerateArea"];

EnumerateArea: PUBLIC EnumerateAreaProc = {
data: REF _ Pipal.ObjectMethod[area, enumerateAreaMethod];
quit _ (IF data=NIL THEN AreaFromEnumerate ELSE (NARROW [data, REF EnumerateAreaProc]^))[area, each, transformation];
};

AreaFromEnumerate: EnumerateAreaProc = {
EachChild: PipalReal.EachChildProc = {quit _ EnumerateArea[child, each, transformation]};
quit _ PipalReal.Enumerate[area, EachChild, transformation];
};

emptyArea: PUBLIC Area = Pipal.void;
fullArea: PUBLIC Area = CreateExplicitArea[PipalReal.fullRectangle]; -- anything would do ...

IsEmptyArea: PUBLIC PROC [area: Area] RETURNS [empty: BOOL] = {
transformation: PipalReal.Transformation _ PipalReal.CreateTransformation[];
empty _ NOT EnumerateArea[area, PipalReal.AlwaysQuit, transformation];
PipalReal.DestroyTransformation[transformation];
};

AreaToRope: PUBLIC PROC [area: Area] RETURNS [rope: Pipal.ROPE] = {
transformation: PipalReal.Transformation _ PipalReal.CreateTransformation[];
EachRect: PipalReal.RectangleProc = {
rope _ Rope.Cat[rope, PipalReal.RectangleToRope[rect], " "];
};
rope _ "{";
[] _ EnumerateArea[area, EachRect, transformation];
PipalReal.DestroyTransformation[transformation];
RETURN [Rope.Cat[rope, "}"]];
};

ExplicitArea: TYPE = REF ExplicitAreaRec;
ExplicitAreaRec: TYPE = RECORD [rectangle: Rectangle];

explicitAreaClass: PRIVATE Pipal.Class _ Pipal.RegisterClass[name: "ExplicitArea", type: CODE [ExplicitAreaRec]];

AreaExplicitArea: EnumerateAreaProc = {
ea: ExplicitArea _ NARROW [area];
quit _ each[ea.rectangle];
};

BBoxExplicitArea: PipalReal.BBoxProc = {
ea: ExplicitArea _ NARROW [object];
bbox _ PipalReal.TransformRectangle[transformation, ea.rectangle];
};

CreateExplicitArea: PUBLIC PROC [rectangle: PipalReal.Rectangle] RETURNS [area: Area] = {
area _ NEW [ExplicitAreaRec _ [rectangle]];
};

ConsRect: PROC [rect: Rectangle, rects: Rectangles] RETURNS [Rectangles] = {
RETURN [IF PipalReal.IsDegeneratedRectangle[rect] THEN rects ELSE CONS [rect, rects]];
};

CollectRects: PROC [area: Area, transformation: PipalReal.Transformation] RETURNS [rects: Rectangles _ NIL] = {
InsertEach: PipalReal.RectangleProc = {rects _ ConsRect[rect, rects]};
[] _ EnumerateArea[area, InsertEach, transformation];
};

IntersectRects: PROC [rects1, rects2: Rectangles] RETURNS [rects: Rectangles _ NIL] = {
FOR list1: Rectangles _ rects1, list1.rest WHILE list1#NIL DO
rect1: Rectangle _ list1.first;
FOR list2: Rectangles _ rects2, list2.rest WHILE list2#NIL DO
rects _ ConsRect[PipalReal.IntersectBox[rect1, list2.first], rects];
ENDLOOP;
ENDLOOP;
};

DecomposeRects: PROC [r, clip: Rectangle] RETURNS [union: Rectangles _ NIL] = {
InsertEach: PipalReal.RectangleProc = {union _ CONS [rect, union]};
[] _ PipalReal.DecomposeRect[r: r, clip: clip, outside: InsertEach];
};

ComplementRects: PROC [rects1, rects2: Rectangles] RETURNS [rects: Rectangles _ NIL] = {
FOR list1: Rectangles _ rects1, list1.rest WHILE list1#NIL DO
rect1: Rectangle _ list1.first;
inter: Rectangles _ LIST [rect1];
FOR list2: Rectangles _ rects2, list2.rest WHILE list2#NIL DO
inter _ IntersectRects[inter, DecomposeRects[r: list2.first, clip: rect1]];
ENDLOOP;
FOR list2: Rectangles _ inter, list2.rest WHILE list2#NIL DO
rects _ ConsRect[list2.first, rects];
ENDLOOP;
ENDLOOP;
};

IntersectionArea: TYPE = REF IntersectionAreaRec;
IntersectionAreaRec: TYPE = RECORD [sub: BOOL, area1, area2: Area];

intersectionAreaClass: PRIVATE Pipal.Class _ Pipal.RegisterClass[name: "IntersectionArea", type: CODE [IntersectionAreaRec]];

AreaIntersectionArea: EnumerateAreaProc = {
ia: IntersectionArea = NARROW [area];
subRects1, subRects2: Rectangles;
subRects1 _ CollectRects[ia.area1, transformation];
subRects2 _ CollectRects[ia.area2, transformation];
FOR list: Rectangles _ (IF ia.sub THEN ComplementRects ELSE IntersectRects)[subRects1, subRects2], list.rest WHILE list#NIL DO
IF each[list.first] THEN RETURN [TRUE];
ENDLOOP;
};

BBoxIntersectionArea: PipalReal.BBoxProc = {
ia: IntersectionArea = NARROW [object];
bbox _ PipalReal.BBox[ia.area1, transformation];
IF NOT ia.sub THEN bbox _ PipalReal.BoundingBox[PipalReal.BBox[ia.area2, transformation], bbox];
};

IntersectArea: PUBLIC PROC [area1, area2: Area] RETURNS [area: Area] = {
area _ NEW [IntersectionAreaRec _ [FALSE, area1, area2]];
};

SubArea: PUBLIC PROC [area1, area2: Area] RETURNS [area: Area] = {
area _ NEW [IntersectionAreaRec _ [TRUE, area1, area2]];
};

ChildishArea: TYPE = REF ChildishAreaRec;
ChildishAreaRec: TYPE = RECORD [child: Pipal.Object, option: AreaOption];

childishAreaClass: PRIVATE Pipal.Class _ Pipal.RegisterClass[name: "ChildishArea", type: CODE [ChildishAreaRec]];

ApplyOnEdges: PROC [rect: Rectangle, each: PipalReal.RectangleProc] RETURNS [quit: BOOL _ FALSE] = {
IF each[[[rect.base.x, rect.base.y], [rect.size.x, 0]]] THEN RETURN [TRUE];
IF each[[[rect.base.x, rect.base.y], [0, rect.size.y]]] THEN RETURN [TRUE];
IF each[[[rect.base.x+rect.size.x, rect.base.y], [0, rect.size.y]]] THEN RETURN [TRUE];
IF each[[[rect.base.x, rect.base.y+rect.size.y], [rect.size.x, 0]]] THEN RETURN [TRUE];
};

AreaChildishArea: EnumerateAreaProc = {
ca: ChildishArea _ NARROW [area];
bbox: Rectangle = PipalReal.BBox[ca.child, transformation];
ExtendedEach: PipalReal.RectangleProc = {quit _ each[PipalReal.Extend[rect, 1.0]]};
EachChildEdge: PipalReal.RectangleProc ~ {quit _ ApplyOnEdges[rect, ExtendedEach]};
SELECT ca.option FROM
bboxChild => quit _ ExtendedEach[bbox];
edgesChild => quit _ ApplyOnEdges[bbox, ExtendedEach];
edgesChildren => quit _ EnumerateArea[ca.child, EachChildEdge, transformation];
ENDCASE => ERROR;
};

BBoxChildishArea: PipalReal.BBoxProc = {
ca: ChildishArea = NARROW [object];
bbox _ PipalReal.Extend[PipalReal.BBox[ca.child, transformation], 1.0];
};

ChildArea: PUBLIC PROC [child: Pipal.Object, option: AreaOption] RETURNS [area: Area] = {
area _ NEW [ChildishAreaRec _ [child, option]];
};

PaintAreaOutlineAnnotation: PaintProc = {
PaintAreaOutline[context, object];
};

CreatePaintAreaOutline: PUBLIC PROC [area: Area] RETURNS [annotation: Pipal.Annotation] = {
annotation _ CreatePaintMethodAnnotation[area, PaintAreaOutlineAnnotation];
};
nullRequest: Request = [none, emptyArea]; -- all what is important here is that referencing/copying it does not cause a memory fault.
RequestToRope: PUBLIC PROC [request: Request] RETURNS [Pipal.ROPE] = {
RETURN [Rope.Cat[
"Request { ", 
SELECT request.type FROM
none		=> "none",
clearArea		=> Rope.Cat["clearArea ", AreaToRope[request.area]],
paintArea		=> Rope.Cat["paintArea ", Pipal.DescribeToRope[request.data], " ", AreaToRope[request.area]],
clearAndPaint	=> Rope.Cat["clearAndPaint ", Pipal.DescribeToRope[request.data], " ", AreaToRope[request.area]],
scale		=> Rope.Cat["scale ", PipalReal.TransformationToRope[NARROW [request.data]]],
other		=> "other",
ENDCASE		=> ERROR,
" }"
]];
};
Mod: PROC [index: NAT, max: NAT] RETURNS [NAT] = INLINE {
RETURN [IF index<max THEN index ELSE index-max];
};

CreateQueue: PUBLIC PROC RETURNS [queue: Queue] = {
requests: REF Requests _ NEW [Requests[1]];
requests[0] _ nullRequest;
queue _ NEW [QueueRec _ [start: 0, size: 0, requests: requests]];
};

IsQueueEmpty: PUBLIC PROC [queue: Queue] RETURNS [BOOL] = {
RETURN [queue.size=0];
};

ClipRequest: PROC [request: Request, area: Area] RETURNS [new: Request] = {
transformation: PipalReal.Transformation _ PipalReal.CreateTransformation[];
bbox1: PipalReal.Rectangle = PipalReal.BBox[request.area, transformation];
bbox2: PipalReal.Rectangle = PipalReal.BBox[area, transformation];
PipalReal.DestroyTransformation[transformation];
new _ request;
IF request.area=area THEN RETURN [nullRequest];
IF NOT PipalReal.DoRectanglesIntersect[bbox1, bbox2] THEN RETURN;
IF ISTYPE [request.area, ExplicitArea] AND ISTYPE [area, ExplicitArea] AND bbox1=bbox2 THEN RETURN [nullRequest];
IF NOT debugConservativeClip THEN new.area _ SubArea[request.area, area];
IF debugTestForEmpty AND IsEmptyArea[new.area] THEN RETURN [nullRequest];
};

OptimizeClear: INTERNAL PROC [queue: Queue, area: Area, start, size: NAT] = {
requests: REF Requests = queue.requests;
max: NAT _ requests.max;
FOR i: NAT DECREASING IN [start .. start+size) DO
index: NAT = Mod[i, max];
SELECT requests[index].type FROM
clearArea, paintArea, clearAndPaint	=> requests[index] _ ClipRequest[requests[index], area];
scale		=> RETURN;
none, other		=> {};
ENDCASE		=> ERROR;
ENDLOOP;
};

Enqueue: PUBLIC ENTRY PROC [queue: Queue, request: Request, reverse: BOOL _ FALSE] = {
ENABLE UNWIND => NULL;
new: NAT;
max: NAT _ queue.requests.max;
IF queue.size>=max THEN {
requests: REF Requests _ NEW [Requests[max*2]];
FOR i: NAT IN [0 .. max) DO requests[i] _ queue.requests[i] ENDLOOP;
FOR i: NAT IN [max .. max*2) DO requests[i] _ nullRequest ENDLOOP;
queue.requests _ requests;
max _ max*2;
};
new _ Mod[queue.start+(IF reverse THEN max-1 ELSE queue.size), max];
IF debugPrintEnqueued THEN TerminalIO.PutF["Enqueued: %g\n", IO.rope[RequestToRope[request]]];
queue.requests[new] _ request;
queue.size _ queue.size+1;
IF reverse THEN queue.start _ new;
IF NOT debugOptimize THEN RETURN;
SELECT request.type FROM
clearArea, clearAndPaint	=> IF NOT reverse THEN OptimizeClear[queue, request.area, queue.start, queue.size-1];
ENDCASE => {};
};

Dequeue: PUBLIC ENTRY PROC [queue: Queue] RETURNS [empty: BOOL, request: Request] = {
ENABLE UNWIND => NULL;
Decr: PROC = {
queue.start _ Mod[queue.start+1, queue.requests.max];
queue.size _ queue.size-1;
};
SkipNone: PROC = {
WHILE queue.size#0 AND queue.requests[queue.start].type=none DO Decr[] ENDLOOP;
};
SkipNone[];
IF queue.size=0 THEN RETURN [TRUE, nullRequest];
request _ queue.requests[queue.start];
Decr[];
empty _ FALSE;
SkipNone[];
WHILE queue.size#0 DO
next: Request _ queue.requests[queue.start];
IF request.type#clearAndPaint OR next.type#clearAndPaint OR request.data#next.data THEN EXIT; -- hack, of course!
request.area _ Pipal.CreateOverlay[LIST [request.area, next.area]];
Decr[];
SkipNone[];
ENDLOOP;
IF debugPrintDequeued THEN TerminalIO.PutF["Dequeued: %g\n", IO.rope[RequestToRope[request]]];
};
PaintIntTranslation: PaintProc = {
translation: PipalInt.Translation _ NARROW [object];
Imager.TranslateT[context, PipalReal.IntToRealVector[translation.vector]];
Paint[translation.child, context];
Imager.TranslateT[context, PipalReal.IntToRealVector[PipalInt.Neg[translation.vector]]];
};

PaintOverlay: PaintProc = {
transformation: PipalReal.Transformation _ PipalReal.CreateTransformation[]; -- changed the day PaintProcs have a transformation!
bounds: Imager.Rectangle _ ImagerBackdoor.GetBounds[context];
clip: Rectangle _ [[bounds.x, bounds.y], [bounds.w, bounds.h]];
overlay: Pipal.Overlay _ NARROW [object];
FOR i: NAT DECREASING IN [0..overlay.size) DO
IF PipalReal.DoRectanglesIntersect[clip, PipalReal.BBox[overlay[i], transformation]] 
THEN Paint[overlay[i], context];
ENDLOOP;
PipalReal.DestroyTransformation[transformation];
};
RectanglePath: PROC [r: Rectangle, moveTo: ImagerPath.MoveToProc, lineTo: ImagerPath.LineToProc] = {
moveTo[r.base];
lineTo[[r.base.x+r.size.x, r.base.y]];
lineTo[[r.base.x+r.size.x, r.base.y+r.size.y]];
lineTo[[r.base.x, r.base.y+r.size.y]];
};

AreaPath: PROC [area: Area, moveTo: ImagerPath.MoveToProc, lineTo: ImagerPath.LineToProc] = {
transformation: PipalReal.Transformation _ PipalReal.CreateTransformation[];
EachRect: PipalReal.RectangleProc = {RectanglePath[rect, moveTo, lineTo]};
[] _ EnumerateArea[area, EachRect, transformation];
PipalReal.DestroyTransformation[transformation];
};

white: Imager.ConstantColor = ImagerColor.Find["Xerox/Research/ChipNDale/CD/InitialColor"];

ClearArea: PUBLIC PROC [context: Imager.Context, area: Area] = {
Path: Imager.PathProc ~ {AreaPath[area, moveTo, lineTo]};
ClearAreaInternal: PROC = {
SetColor[context, IF debugClipArea THEN Imager.MakeGray[0.25] ELSE white];
Imager.MaskFill[context: context, path: Path, oddWrap: FALSE];
};
Imager.DoSave[context, ClearAreaInternal];
};

ClipAndPaint: PUBLIC PROC [context: Imager.Context, object: Pipal.Object, clipArea: Area] = {
Path: Imager.PathProc ~ {AreaPath[clipArea, moveTo, lineTo]};
ClipAndPaintInternal: PROC = {
Imager.Clip[context: context, path: Path, oddWrap: FALSE];
Paint[object, context];
};
Imager.DoSave[context, ClipAndPaintInternal];
};

ClearClipAndPaint: PUBLIC PROC [context: Imager.Context, object: Pipal.Object, clipArea: Area] = {
Path: Imager.PathProc ~ {AreaPath[clipArea, moveTo, lineTo]};
ClearClipAndPaintInternal: PROC = {
SetColor[context, IF debugClipArea THEN Imager.MakeGray[0.25] ELSE white];
Imager.MaskFill[context: context, path: Path, oddWrap: FALSE];
Imager.Clip[context: context, path: Path, oddWrap: FALSE];
Paint[object, context];
};
Imager.DoSave[context, ClearClipAndPaintInternal];
};

PaintOutline: PUBLIC PROC [context: Imager.Context, r: Rectangle, color: Color _ Imager.black] = {
SetColor[context, color];
Imager.MaskVector[context, [r.base.x, r.base.y], [r.base.x+r.size.x, r.base.y]];
Imager.MaskVector[context, [r.base.x, r.base.y], [r.base.x, r.base.y+r.size.y]];
Imager.MaskVector[context, [r.base.x+r.size.x, r.base.y], [r.base.x+r.size.x, r.base.y+r.size.y]];
Imager.MaskVector[context, [r.base.x, r.base.y+r.size.y], [r.base.x+r.size.x, r.base.y+r.size.y]];
};

PaintAreaOutline: PUBLIC PROC [context: Imager.Context, area: Area, color: Color _ Imager.black] = {
transformation: PipalReal.Transformation _ PipalReal.CreateTransformation[];
Each: PipalReal.RectangleProc ~ {PaintOutline[context, rect, color]};
[] _ EnumerateArea[area, Each, transformation];
PipalReal.DestroyTransformation[transformation];
};

PaintArea: PUBLIC PROC [context: Imager.Context, area: Area, color: Color _ Imager.black] = {
transformation: PipalReal.Transformation _ PipalReal.CreateTransformation[];
EachRect: PipalReal.RectangleProc ~ {
Imager.MaskRectangle[context, [rect.base.x, rect.base.y, rect.size.x, rect.size.y]];
};
SetColor[context, color];
[] _ EnumerateArea[area, EachRect, transformation];
PipalReal.DestroyTransformation[transformation];
};

SetColor: PUBLIC PROC [context: Imager.Context, color: Color] = {
IF ImagerBackdoor.GetColor[context]#color THEN Imager.SetColor[context, color];
};
Pipal.PutClassMethod[explicitAreaClass, enumerateAreaMethod, NEW [EnumerateAreaProc _ AreaExplicitArea]];
Pipal.PutClassMethod[explicitAreaClass, PipalReal.bboxMethod, NEW [PipalReal.BBoxProc _ BBoxExplicitArea]];

Pipal.PutClassMethod[intersectionAreaClass, enumerateAreaMethod, NEW [EnumerateAreaProc _ AreaIntersectionArea]];
Pipal.PutClassMethod[intersectionAreaClass, PipalReal.bboxMethod, NEW [PipalReal.BBoxProc _ BBoxIntersectionArea]];

Pipal.PutClassMethod[childishAreaClass, enumerateAreaMethod, NEW [EnumerateAreaProc _ AreaChildishArea]];
Pipal.PutClassMethod[childishAreaClass, PipalReal.bboxMethod, NEW [PipalReal.BBoxProc _ BBoxChildishArea]];

Pipal.PutClassMethod[Pipal.annotationClass, paintMethod, NEW [PaintProc _ PaintAnnotation]];

Pipal.PutClassMethod[PipalInt.translationClass, paintMethod, NEW [PaintProc _ PaintIntTranslation]]; -- speed up
Pipal.PutClassMethod[Pipal.overlayClass, paintMethod, NEW [PaintProc _ PaintOverlay]]; -- speed up


END. 
<PipalPaintImpl.mesa
Copyright Σ 1988 by Xerox Corporation.  All rights reserved.
Louis Monier February 2, 1988 2:31:30 am PST
Bertrand Serlet May 19, 1988 6:32:34 pm PDT

Debug Flags
Painting Procedures
Paint Method Annotation 
Areas
Special Area Classes
Compensating for the thickness of the outline
Paint Queue

We look around to see if the next request can be collapsed with request
Speed-up hacks 
This one is more than a speed up since it does clipping.  Maybe the clipping could be put in enumerate, and we could get rid of this one.
Utilities
Initialization
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