Re: [NTG-pdftex] \pdfoptionpdfminorversion

On Mon, 21 Feb 2005, Heiko Oberdiek wrote:

This could be solved by an internal variable that records the maximum version of used PDF features. Then conflicts with \pdfoptionpdfminorversion can be detected and an error or warning can be raised.

Or pdftex could track the maximum of minor version and write this value at the _end_ of the pdftex run (currently it's written at the start, and frozen). There is already a procedure for setting the /Length counts, which can be mis-used, e. g. i have just tried this: @

; pdf_flush; write_stream_length(2,7); {experiment: set the minor version number to 2} print_nl("Output written on "); slow_print(output_file_name); Then one could make a fast macro which updates the minor version at any functionality requiring at least a certain value, about: @d require_minor_version(#) == if minorversion < # then minorversion := # And also the \pdfoptionpdfminorversion would just use the same macro after clipping to max. 9. By this one could never force a minor version value that is too low. OTOH it's then difficult to forcibly keep pdftex at a wanted low version number.

Also this can be extended by a new primitive, thus that packages such as hyperref also can mark its code with its maximum version number of used PDF features.

Regards, Hartmut