fix(metadata): validate gainmap metadata descriptors upon decoding/pa… - #449
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…rsing Centralizes metadata descriptor validation via uhdr_validate_gainmap_metadata_descriptor when converting ISO 21496-1 fractional metadata (gainmapMetadataFractionToFloat) and when parsing XMP metadata (getMetadataFromXMP). Also checks error status during HEIF/AVIF tone map probing (uhdr_dec_probe) so malformed ratios, non-positive gamma values, or inverted headroom capacities cannot corrupt internal codec state. Fixes b/546599945.
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Centralizes metadata descriptor validation via uhdr_validate_gainmap_metadata_descriptor when converting ISO 21496-1 fractional metadata (gainmapMetadataFractionToFloat) and when parsing XMP metadata (getMetadataFromXMP). Also checks error status during HEIF/AVIF tone map probing (uhdr_dec_probe) so malformed ratios, non-positive gamma values, or inverted headroom capacities cannot corrupt internal codec state.