Thread out sixel building #2573

dankamongmen / notcurses

blingful character graphics/TUI library. definitely not curses.

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Closed dankamongmen closed 2 years ago

dankamongmen commented 2 years ago

Build up the auxvec in sixel_wipe(), necessary for rebuild
Thread out sixel encoding in the second pass. The first pass, color table construction, remains singly-threaded. The second pass utilizes 3 helper threads. #2573