On Sun 08 Oct 2017 20:26:02 Keith Marshall wrote: > You may recall that I did begin to explore possibilities, at the time, > but then life ... explicitly a protracted visit to Australia and New > Zealand, followed by too many other priorities on return ... got in the > way. I've now found a bit of time to revisit it, and have posted some > prototypical code at https://osdn.net/users/keith/pf/groff-psbb/files
Some pdfs I have tried fail with "syntax error". It seems to occur if MediaBox is defined in an ancestor object rather than in a "/Page object. There are a number of page attributes which are inheritable in this way, MediaBox is one of them. The standard says:- ============================================================ ================== Inheritance of Page Attributes Some of the page attributes shown in Table 3.18 are designated as inheritable. If such an attribute is omitted from a page object, its value is inherited from an ancestor node in the page tree. If the attribute is a required one, a value must be supplied in an ancestor node; if it is optional and no inherited value is specified, the default value is used. An attribute can thus be defined once for a whole set of pages, by specifying it in an intermediate page tree node and arranging the pages that share the attribute as descendants of that node. For example, a document might specify the same media box for all of its pages by including a MediaBox entry in the root node of the page tree. If necessary, an individual page object could then override this inherited value with a MediaBox entry of its own. ============================================================ ================== So in case a MediaBox is superseded by an entry further down the tree you still have to continue looking till you get to the object for page 1, to make sure.
