The format for a mask is {maskBounds: rectangle, maskKind: string, maskEdgeMode: string, featherAmount: int, maskData: hex-string}.
maskBounds specifies the bounding rectangle of the mask area.
maskKind are "rectangle", "oval", "zlib compressed", "rle compressed", or "uncompressed".
maskKind is "rectangle" or "oval", the maskData string is ignored, and a mask of the right shape is constructed that fills maskBounds and that has the edge specified by maskEdgeMode and featherAmount.
maskKind is "zlib compressed", "rle compressed", or "uncompressed", the maskData string is presumed to contain 8-bit mask data in hexadecimal format that precisely matches the maskBounds to define the mask.
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