STY: Change variable names

[j-t-1]

Make it obvious that "mode" is the new value of "prev_mode". Also change "by" to "byt" for better readability.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.47%. Comparing base (493785c) to head (b0aa2d7).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3077   +/-   ##
=======================================
  Coverage   96.47%   96.47%           
=======================================
  Files          52       52           
  Lines        8778     8778           
  Branches     1600     1600           
=======================================
  Hits         8469     8469           
  Misses        184      184           
  Partials      125      125           

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[j-t-1]

In mode_map there are comments like "pos [0] will be used for 1 bit". Which array is "pos"?

[stefan6419846]

The position seems to correspond to line 117.

[j-t-1]

The position seems to correspond to line 117.

Thanks!

PDF 2.0 specification section 8.6 Colour Spaces references Figure 20 — Colour specification and Figure 21 — Colour rendering. Roughly where do these fit into our codebase?

[stefan6419846]

There is no direct equivalent. They should mostly be covered by pypdf._xobj_image_helpers and pypdf.filters.