DIRECTORY Atom USING [PropList], ImagerSample USING [Function, maxVec, nullFunction, PixelBuffer, PixelMap, PixelProc, Sample, SampleMap, SampleBuffer, Vec, zeroVec], ImagerTransformation USING [ScanMode, Transformation], Rope USING [ROPE]; ImagerPixelArray: CEDAR DEFINITIONS ~ BEGIN Transformation: TYPE ~ ImagerTransformation.Transformation; ScanMode: TYPE ~ ImagerTransformation.ScanMode; Sample: TYPE ~ ImagerSample.Sample; SampleBuffer: TYPE ~ ImagerSample.SampleBuffer; SampleMap: TYPE ~ ImagerSample.SampleMap; PixelProc: TYPE ~ ImagerSample.PixelProc; PixelBuffer: TYPE ~ ImagerSample.PixelBuffer; PixelMap: TYPE ~ ImagerSample.PixelMap; Vec: TYPE ~ ImagerSample.Vec; zeroVec: Vec ~ ImagerSample.zeroVec; maxVec: Vec ~ ImagerSample.maxVec; Function: TYPE ~ ImagerSample.Function; nullFunction: Function ~ ImagerSample.nullFunction; ROPE: TYPE ~ Rope.ROPE; maxCount: NAT ~ NAT.LAST; PixelArray: TYPE ~ REF PixelArrayRep; PixelArrayRep: TYPE ~ RECORD [ immutable: BOOL, samplesPerPixel: NAT, -- number of samples for each pixel sSize, fSize: INT, -- slow and fast dimensions (Interpress calls these xPixels, yPixels) m: Transformation, -- transforms [s, f] coordinates to "upright" [x, y] coordinates class: REF PixelArrayClassRep, -- class operations data: REF, -- instance data propList: Atom.PropList _ NIL ]; PixelArrayClassRep: TYPE; -- see ImagerPixelArrayPrivate ErrorDesc: TYPE ~ RECORD [code: ATOM, explanation: ROPE]; Error: ERROR [error: ErrorDesc]; GetClass: PROC [self: PixelArray] RETURNS [ATOM]; MaxSampleValue: PROC [self: PixelArray, i: NAT] RETURNS [Sample]; Get: PROC [self: PixelArray, i: NAT _ 0, s, f: INT] RETURNS [Sample]; GetSamples: PROC [self: PixelArray, i: NAT _ 0, s, f: INT _ 0, samples: SampleBuffer, start: NAT _ 0, count: NAT _ maxCount]; GetPixels: PROC [self: PixelArray, s, f: INT _ 0, pixels: PixelBuffer, start: NAT _ 0, count: NAT _ maxCount]; Transfer: PROC [self: PixelArray, i: NAT _ 0, s, f: INT _ 0, dst: SampleMap, dstMin: Vec _ zeroVec, size: Vec _ maxVec, function: Function _ nullFunction]; Copy: PROC [self: PixelArray] RETURNS [PixelArray]; Extract: PROC [old: PixelArray, samplesPerPixel: NAT, select: PROC [NAT] RETURNS [NAT]] RETURNS [new: PixelArray]; Join: PROC [list: LIST OF PixelArray] RETURNS [PixelArray]; Join3: PROC [pa1, pa2, pa3: PixelArray] RETURNS [PixelArray]; FromPixelMap: PROC [map: PixelMap, scanMode: ScanMode, immutable: BOOL _ FALSE] RETURNS [PixelArray]; FromAIS: PROC [name: ROPE] RETURNS [PixelArray]; Join3AIS: PROC [name1, name2, name3: ROPE] RETURNS [PixelArray]; END. ฎImagerPixelArray.mesa Copyright c 1984, 1985, 1986 by Xerox Corporation. All rights reserved. Michael Plass, August 1, 1984 9:59:33 am PDT Doug Wyatt, March 3, 1986 3:09:37 pm PST Basic operations The pixel array contains sSize*fSize pixels, samplesPerPixel*sSize*fSize samples. A sample is named by a triple: i IN[0..samplesPerPixel), s IN[0..sSize), f IN[0..fSize). ... returns an ATOM that identifies the PixelArray's class. ... returns the maximum sample value for the ith sample. For all i IN[0..self.samplesPerPixel), s IN[0..self.sSize), f IN[0..self.fSize): self.Get[i, s, f] IN[0..self.MaxSampleValue[i]]. ... returns the sample value with indices [i, s, f]. ! BoundsFault if i ~IN[0..self.samplesPerPixel) OR s ~IN[0..self.sSize) OR f ~IN[0..self.fSize). ... fetches a run of samples into a buffer. The effect is: FOR k: NAT IN[0..MIN[samples.length-start, count]) DO samples[start+k] _ self.Get[i, s, f+k] ENDLOOP ! BoundsFault if any index into the pixel array is out of range ... fetches a run of pixels into a buffer. The effect is: FOR i: NAT IN[0..self.samplesPerPixel) DO self.GetSamples[i, s, f, pixels[i], start, count] ENDLOOP ! BoundsFault if any index into the pixel array is out of range ... like ImagerSample.Transfer, where the pixel array is the source. ! BoundsFault if any sample index is out of range Creating pixel arrays ... makes an immutable copy of a pixel array; returns self if self.immutable. ... extracts selected sample layers from a pixel array. new.samplesPerPixel = samplesPerPixel new.sSize = old.sSize, new.fSize = old.fSize ImagerTransformation.Equal[new.m, old.m] new.MaxSampleValue[i] = old.MaxSampleValue[select[i]] new.Get[i, s, f] = old.Get[select[i], s, f] ! BoundsFault if for any i IN[0..samplesPerPixel), select[i] ~IN[0..pa.samplesPerPixel). ... joins multiple sample planes into one PixelArray. ! Error[[$incompatibleJoin, ...]] if sizes or transformations do not match. If immutable=TRUE, caller guarantees that the contents of the PixelMap will not change as long as the PixelArray is in use. The ScanMode relates the (slow, fast) coords of the PixelMap to the client coords of the PixelArray. ... makes a pixel array from an AIS file with the specified name. ! FS.Error if the named file cannot be opened. ! Error[[$malformedAISFile, ...]] if the file is not a valid AIS file. A convenience, equivalent to Join3[FromAIS[name1], FromAIS[name2], FromAIS[name3]]. ! 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