Proof of concept implementation of an incremental transfer system using HarfBuzz subsetting (hb-subset) combined with a well-known patch algorithm. State is entirely transient; refresh to reset. We do lots of woefully inefficient things; demonstrating speed is NOT the point.
Note the version of harfbuzz subsetting used in this demo does not yet support layout table subsetting or subsetting variation tables.
Coming soon: Brotli Patch Mode.
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NOTE: all options other than incremental transfer break layout features across segments. In reality this forces the use of large blocks in many scenarios (Arabic, Indic, many latin cases, etc).