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+% fixpdfmag.tex
+% Author: Javier Bezos, 2007
+%
+% This is Public Domain. You are free to use, copy, modify,
+% distribute or whatever you want without restrictions. It is
+% unsupported, so please, do not contact the author, just
+% modify the file.
+%
+% Unfortunately, pdftex has changed recently its behaviour and
+% now the page size is affected by \magnification, usually not a
+% wanted effect. It has been proposed to modify Plain TeX when
+% used with pdftex, by making a few changes in the pdftex.ini
+% file, but many people do not know or simply do not want to
+% modify Plain TeX or a custom made format. This file provides
+% an alternative which requires to modify the documents, as
+% the following example illustrates:
+%
+% \magnification3000
+% \input fixpdfmag % <- after \magnification
+%
+% Hello
+% \bye
+%
+% If you are using a custom page size, it is preserved,
+% as it just converts pt units to truept ones.
+
+\ifx\pdfpageheight\undefined\else
+ \begingroup
+ \catcode`\@=11
+ \global\pdfpageheight\expandafter\getf@ctor\the\pdfpageheight truept
+ \global\pdfpagewidth\expandafter\getf@ctor\the\pdfpagewidth truept
+ \global\pdfhorigin\expandafter\getf@ctor\the\pdfhorigin truept
+ \global\pdfvorigin\expandafter\getf@ctor\the\pdfvorigin truept
+ \endgroup
+\fi
+\endinput \ No newline at end of file