Call for help - understanding how to debug sw module

Chris Sherlock chris.sherlock79 at
Sat Jan 30 17:00:22 PST 2016

Well, I just read the AquaSalGraphics code and there is a sanity check that limits it to 200DPI!

I’m just testing now what happens if I set the max to 300. 


> On 29 Jan 2016, at 9:39 PM, Tomaž Vajngerl <quikee at> wrote:
> Hi,
> 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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