ShutDown: PROC [];         -- free memory in case the last user has left

OpenPixelBuffer: PROC [box: ClipperRecord, buffer: PixelArray ← NIL] RETURNS [PixelArray]; -- redirect writes for double-buffer

ClosePixelBuffer: PROC [];        -- drop pixel buffer ref

ColortoPixel: PROC [color: CIEColor] RETURNS [LONG CARDINAL];  -- Color to device transform

PixeltoColor: PROC [pxlValue: LONG CARDINAL] RETURNS [CIEColor];

HilitePxls: PROC [area: IntRectangle];     -- Device dependent highlighting scheme

MovePxls: PROC [source: IntRectangle, destination: IntPair];     -- move on display

StorePxls: PROC [source: IntRectangle] RETURNS [PixelArray];

LoadPxls: PROC [source: PixelArray ← NIL, destination: IntPair, transparent: BOOLEAN];

StoreScanSeg: PROC [x, y, length: CARDINAL] RETURNS [ByteSequence];

LoadScanSeg: PROC [x, y, length: CARDINAL, segment: ByteSequence, transparent: BOOLEAN];

LoadTrapezoid: PROC [top, bottom, leftTop, leftBot, rightTop, rightBot: CARDINAL, pxlValue: LONG CARDINAL];             -- Scan convert trapezoid, constant color

SetPxl: PROC [x, y: CARDINAL, pxlValue: LONG CARDINAL];

GetPxl: PROC [x, y: CARDINAL] RETURNS [LONG CARDINAL];

DrawLine: PROC [a, b: IntPair, pxlValue: LONG CARDINAL]; -- draw a fast line, constant color

Tiler: PROC [VtxCount: CARDINAL, Vertices: ImagerDisplay.VtxSequence];

END.