qpdfview team mailing list archive

[Adam Reichold <adamreichold@xxxxxxxxxxx>]

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Well, it's the same bad design as the Poppler qt4 frontend uses.

But really, just consider it part of the description of "Page::size":
"returns the size of the page at 72 DPI". (So the declaration of
Page::size is the single of definition. Documentation is really bad
though. :-\)

It is completely equivalent to assuming some physical unit and
returning the physical page size. I wouldn't call it magical, just
convention on what is meant by size.

Am 11.01.2013 14:38, schrieb ????????? ??????:
> Well, I think it's bad design if the plugins should know some
> magical constant from the core. At least it has to be defined in a
> single place.
> 
>> The idea is that 72.0 DPI is just the logical/reference
>> resolution of dimensions that are returned by Page::size, it is
>> independent of the actual resolution of any data in the document
>> files. If the dimension in a document/page use a different
>> reference resolution, I would say we transform them accordingly
>> and transparently in the back-end itself. (Links and stuff use a
>> different scheme where their coordinates are inside [0,1] x [0,1]
>> describing position w.r.t. to page dimension.)
>> 
>> The resolution at which the data should be rendered is always
>> passed to Page::render explicitly and depends on the physical
>> resolution of the monitor (or possibly printer) used. (So I think
>> typically, if you have a 300 DPI image in a DjVu file, you would
>> scale it down to monitor resolution times scale factor for
>> rendering.)
>> 
>> Best regards, Adam.
> 
> 
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