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LibGfx/JBIG2Loader: Add a short comment with spec history

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I found this interesting, and it also explains e.g. why some
of the step numbers in 6.4 Text Region Decoding Procedure are off --
they added step 3) for COLEXTFLAG and forgot to update step references
to later steps.
This commit is contained in:
Nico Weber 2024-03-27 08:57:33 -04:00 • committed by Tim Flynn
commit 5a43fc83bd
Notes: sideshowbarker 2024-07-17 02:28:18 +09:00
1 changed files with 11 additions and 0 deletions
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11
Userland/Libraries/LibGfx/ImageFormats/JBIG2Loader.cpp
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@ -14,6 +14,17 @@
// https://www.itu.int/rec/T-REC-T.88-201808-I
// Annex H has a datastream example.
// That spec was published in 2018 and contains all previous amendments. Its history is:
// * 2002: Original spec published, describes decoding only. Has generic regions,
// symbol regions, text regions, halftone regions, and pattern regions.
// * 2003: Amendment 1 approved. Describes encoding. Not interesting for us.
// * 2004: (Amendment 1 erratum 1 approved. Not interesting for us.)
// * 2003: Amendment 2 approved. Added support for EXTTEMPLATE.
// * 2011: Amendment 3 approved. Added support for color coding
// (COLEXTFLAG, CPCOMPLEN, CPDEFCOLS, CPEXCOLS, CPNCOMP, CPNVALS, GBCOLS,
// GBCOMBOP, GBFGCOLID, SBCOLS, SBCOLSECTSIZE and SBFGCOLID).
// This history might explain why EXTTEMPLATE and colors are very rare in practice.
namespace Gfx {
namespace JBIG2 {