Bug#1118385: texlive-binaries: corner-case PDF image nondeterminism

Preuße, Hilmar <[email protected]> Tue, 28 Apr 2026 19:53:38 +0200

Newsgroups	gmane.linux.debian.devel.tetex
Message-ID	<f67b8812-ae1f-40ef-8907-8bdb7f79617e__47181.9636107952$1777398924$gmane$org@web.de>

Am 19.10.2025 um 04:57 schrieb Aaron M. Ucko:

Hello Aaron,

TL 2026 has entered the unstable archive and will (hopefully) end up in 
Debian testing. Does it makes things better?

Hilmar

> I have found that when a PNG image's row width does not correspond to a
> whole number of bytes, the low-order bits of the last byte in each
> uncompressed row can fluctuate between pdflatex runs, at least when
> libpng can perform SIMD-assisted decompression, yielding
> nondeterministic output even when arranging to supply predetermined
> timestamps.  (Moreover, this fluctuation can affect the length of the
> resulting compressed stream, slightly shifting the file position of
> subsequent content.)
> 


-- 
sigfault

OpenPGP_signature.asc (application/pgp-signature, 840 B)