ReadonlycountsCompressed RLE counts string.
This matches the compact binary-mask representation commonly emitted by CV tooling. The renderer may prepare it into an ID-mask artifact before drawing.
ReadonlyencodingReadonlyheightMask height in mask pixels.
ReadonlywidthMask width in mask pixels.
Compressed run-length encoded binary mask.
RLE is the semantic cold-storage representation. Renderers may convert it into prepared runtime artifacts such as ID masks, textures, or other backend specific resources.