Slurp() returned a fresh std::vector per call, so every frame allocated the
whole compressed file - 18 MB on a 16 Mpx detector - and value-initialised it
before the read overwrote every byte. Measured on one such frame that is 9.2 ms
against 5.4 ms into a buffer that is already there.
ReadInto() now takes the scratch, and the raw image carries it, so a worker
reading a sweep reads every file into the same bytes. Slurp() fills a buffer
instead of returning one, which is also what makes the resize cost nothing when
the next file is the same size as the last.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
leonarski_fandClaude Opus 5
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