Function optimal_path 

pub fn optimal_path(
    source: PixelDescriptor,
    provenance: Provenance,
    operation: OpCategory,
    output: PixelDescriptor,
    threshold: QualityThreshold,
) -> Option<ConversionPath>

Find the optimal conversion path for a (source, operation, output) triple.

Returns None if no path satisfies the quality threshold.

Arguments

• source - Source pixel format (from decoder)
• provenance - Origin precision of the source data
• operation - What operation will be performed
• output - Target pixel format (for encoder)
• threshold - Maximum acceptable quality loss