MLightCAD
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    Canvas and drawing-display colours that are independent of AcEdUiTheme.

    AcEdUiTheme and the COLORTHEME sysvar drive chrome tokens (CSS variables). This module holds helpers for the CAD viewport:

    • Layout backgroundMODELBKCOLOR / PAPERBKCOLOR control the canvas clear colour and ACI-7 foreground inversion.
    • UI colour themeCOLORTHEME only affects viewer chrome, not canvas or ACI-7 rendering.

    Shared colour constants and luminance helpers live in @mlightcad/three-renderer (AcTrDisplayColors) and are re-exported here for editor callers.

    • ACI-7 / foreground colour that contrasts with the canvas background.

      Parameters

      • backgroundColor: number

      Returns number