ImagerDevice.mesa
Copyright © 1984, 1985 by Xerox Corporation. All rights reserved.
Michael Plass, June 11, 1985 2:50:25 pm PDT
Doug Wyatt, May 19, 1985 4:00:08 pm PDT
DIRECTORY
ImagerColorDefs USING [Color],
ImagerFont USING [CorrectionType, XChar],
ImagerTransformation USING [Transformation],
Scaled USING [Value],
Vector2 USING [VEC];
ImagerDevice: CEDAR DEFINITIONS
~
BEGIN
Transformation: TYPE ~ ImagerTransformation.Transformation;
VEC: TYPE ~ Vector2.VEC;
DeviceBox:
TYPE ~
RECORD [smin, fmin, smax, fmax:
CARDINAL];
RunProc: TYPE ~ PROC [sMin, fMin: INTEGER, fSize: NAT];
BoxProc:
TYPE ~
PROC [DeviceBox];
HalftoneParameters:
TYPE ~
RECORD[
dotsPerInch: REAL,
angle: REAL, -- degrees anticlockwise from +x axis
shape: REAL -- 0.5 is circular
];
Device: TYPE ~ REF DeviceRep;
DeviceRep:
TYPE ~
RECORD[
class: Class, -- class operations
data: REF, -- instance data
box: DeviceBox, -- bounding rectangle, in device coordinates
surfaceToDevice: Transformation, -- transformation from surface to device coordinates
surfaceUnitsPerInch: VEC, -- x and y scale factors
surfaceUnitsPerPixel: NAT -- surface resolution may be a multiple of pixel resolution
];
CharMask: TYPE ~ REF CharMaskRep;
CharMaskRep:
TYPE ~
MACHINE
DEPENDENT
RECORD [
font: REF, -- font and char together provide a unique identifier for this mask
char: ImagerFont.XChar,
sWidth, fWidth: Scaled.Value,
sMinBB, fMinBB: INTEGER,
sSizeBB, fSizeBB: CARDINAL,
metricsValid: BOOL, -- numbers above are invalid if this is true.
amplified: BOOL,
correction: ImagerFont.CorrectionType,
flag: PACKED ARRAY [0..10) OF [0..1], -- for padding and expansion
data:
SELECT rep: *
FROM
raster => [bits: SEQUENCE COMPUTED CARDINAL -- sSize*Ceiling[fSize/16.0] -- OF WORD],
runs => [run: SEQUENCE nRuns: CARDINAL OF Run],
uncached => [],
ENDCASE
];
Run:
TYPE ~
MACHINE
DEPENDENT
RECORD [fMin:
CARDINAL, lastRun:
BOOL, fSize:
NAT];
Same as PDFileFormat.Run; fMin is relative to fMinBB.
Class: TYPE ~ REF ClassRep;
ClassRep:
TYPE ~
RECORD[
type: ATOM,
SetColor: PROC[device: Device, color: ImagerColorDefs.Color, viewToDevice: Transformation],
SetPriority: PROC[device: Device, priorityImportant: BOOL],
SetHalftone: PROC[device: Device, halftone: HalftoneParameters],
MaskRuns: PROC[device: Device, bounds: DeviceBox, runs: PROC[RunProc]],
MaskBoxes: PROC[device: Device, bounds: DeviceBox, boxes: PROC[BoxProc]],
MaskBits: PROC[device: Device, srcBase: LONG POINTER, srcWordsPerLine: NAT,
ts, tf: INTEGER, boxes: PROC[BoxProc]],
DrawBits: PROC[device: Device, srcBase: LONG POINTER, srcWordsPerLine: NAT,
ts, tf: INTEGER, boxes: PROC[BoxProc]] ← NIL,
MoveBoxes: PROC[device: Device, ts, tf: INTEGER, boxes: PROC[BoxProc]],
MaskChar: PROC[device: Device, s, f: INTEGER, mask: CharMask]
];
END.