Function readOverlayRegions

readOverlayRegions(
layer: Element,
): { plotArea: PixelRect | null; exclude: PixelRect[] }
Reads the plot area and painted-over areas back off an overlay layer, in screen coordinates.
Parameters
- layer: Element
  The overlay layer
Returns { plotArea: PixelRect | null; exclude: PixelRect[] }
The plot area, or null when none was written, and the areas to treat as background
- Defined in util/overlayRegions.ts:101

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