Re: [xmlroff] Re: xmlroff on Windows

[Tony G. <Ton...@Su...>]

Jesper Stigberg wrote at  8 May 2003 14:39:29 +0200:
 > Tony Graham wrote:
...
 > > I have started a Wiki page to collect in one place all the possibly
 > > differing interpretations of device units from XSL, Pango, and
 > > FreeType (although I haven't got to FreeType yet).  You are welcome to
 > > annotate it.
 > 
 > Great. What do gnome-print use as a unit?

So far I've found that the PDF and PostScript outputs use different
units.  GNOME Print is under-documented, so there may be something
that I'm missing.

See pangogp-to-pdf.c in pangopdf/examples.

 > > What do you do in your rendering application if you want to scale the
 > > rendered image, e.g. reduce it so a whole page appears in the window?
 > > 
 > 
 > A bit simplified.
 > 
 > In the win32 GDI (graphics device interface), all drawing,
 > text-output etc is done through a device-context using
 > logical-units. What appears on the screen is measured in
 > device-units. A device-unit==scale*logical-unit ( this mapping is
 > done by the OS ). So by changing the scale you can get a zoom
 > effect without changing the coordinates etc in your drawing code,
 > or use the same code to render to a printer.

And the logical unit is a 'twip', i.e., a logical pixel?

Regards,


Tony Graham
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