Commits on Nov 15, 2022

1. BMP output safety …

   In open(), check for non-zero image offsets, which is not supported by
   BMP, and issue an error if found. If the spec passed in has nonzero
   spec.y, other code in the write functions would fail because they
   assumed spec.y == 0 and could therefore access memory incorrectly.
   
   More generally, also put checks in the write functions that issue
   errors and take early outs if they find that they are called on a
   BMPOutput that is not currently open, for example if open() fails but
   the user doesn't check the return codes and proceeds to call the write
   functions anyway.
   
   This addresses 1653

   

   lgritz committed Nov 15, 2022
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