[gs-bugs] [Bug 691475] New: jpeg 8b related changes

bugzilla-daemon at ghostscript.com bugzilla-daemon at ghostscript.com
Sun Jul 18 23:37:12 UTC 2010


http://bugs.ghostscript.com/show_bug.cgi?id=691475

           Summary: jpeg 8b related changes
           Product: Ghostscript
           Version: HEAD
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P4
         Component: Images
        AssignedTo: alex.cherepanov at artifex.com
        ReportedBy: hintak at ghostscript.com
         QAContact: gs-bugs at ghostscript.com
   Estimated Hours: 0.0


Created an attachment (id=6504)
 --> (http://bugs.ghostscript.com/attachment.cgi?id=6504)
jpeg 8b related base/jpeg.mak change 

Just trying to see what changes between jpeg 6b and jpeg 8b.

The attached patch updated the base/jpeg.mak - in jpeg 8b jdphuff.c no longer
exists, but its function seems to be served by jdarith.c (and jcarith.c encoder
part is added).

As for the jpeg/ directory - jdmarker.c contains some bug fixes from Raph
Levien which were never sent upstream; and need to revert r11471 which updated
config.guess/config.sub to an intermediate version, before the jpeg6b->jpeg8b
is applied.

Apparently there are some incompatibility (enhancement...) between 8b and 6b,
and jpegs written by 8b involving the new SmoothScale functionality may not be
readable by 6b, so this change probably should be regarded as something for the
long term.

e.g. when Linux distros start to ship jpeg 8b (some are shipping jpeg 7), one
might want to follow. Also the jdmarker.c change from Raph probably needs to go
upstream.

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