Commits on Oct 25, 2023

1. Implement streamtype=1 option for tables-only JPEG encoding …

   We already support streamtype=2 to skip producing JPEG tables, but
   streamtype=1, which skips everything but the tables, was never implemented.
   The streamtype=1 stub code dates to Git pre-history, so it's not
   immediately clear why.  Implement the missing support.
   
   jpeg_write_tables() can't resume after a full output buffer (it fails with
   JERR_CANT_SUSPEND), so it might seem that Pillow needs to pre-compute the
   necessary buffer size.  However, in the normal case of producing an
   interchange stream, the tables are written via the same libjpeg codepath
   during the first jpeg_write_scanlines() call, and table writes aren't
   resumable there either.  Thus, any buffer large enough for the normal case
   will also be large enough for a tables-only file.
   
   The streamtype option isn't documented and this commit doesn't change that.
   It does add a test though.
   
   Co-authored-by: Andrew Murray <radarhere@users.noreply.github.com>

   

   bgilbert and radarhere committed Oct 25, 2023
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