Call for help - understanding how to debug sw module

Tomaž Vajngerl quikee at
Fri Jan 29 02:39:38 PST 2016


On Thu, Jan 28, 2016 at 9:52 AM, Chris Sherlock
<chris.sherlock79 at> wrote:
> I did a calculation from and apparently I have a pixel density of 267.02 PPI.
> Wondering if this is skewing the calculations.

OS usually doesn't tell the correct monitor DPI to the application but
usually just reports 96 DPI (if no scaling is applied). In windows you
can change the scale levels - 100%, 125%, 150%, 200%,... which just
adjusts what DPI is reported to the application (100% - 96DPI, 125% -
120DPI, 150% - 144 DPI, 200% - 192DPI...) so the application can scale
accordingly (at least fonts). I'm not sure how OSX does this.

You should check what DPI is actually reported to LO - OutputDevice
has mnDPIX and mnDPIY - check where they are set and to what value.
DPI influences how pixels are converted to and from actual units (mm,
inch, twips,..) It could be that we transform between units just too
much and the error accumulates if the DPI is set to a weird value.
Tracking this down could be tricky.

> Chris

Regards, Tomaž

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