Call for help - understanding how to debug sw module

[Chris Sherlock]

OK, I didn’t read the comment above it correctly - 200 should be more than enough our AquaSalGraphics class doesn’t give DPI in terms of actual screen resolution but the logical screen resolution. 

I’ve pushed a gerrit patch for review to get the *actual* screen DPI if anyone wanted to review it:

https://gerrit.libreoffice.org/#/c/21948/ 

Chris

> On 31 Jan 2016, at 12:18 PM, Chris Sherlock <chris.sherlock79 at gmail.com> wrote:
> 
> Oops, my calculation is out by quite a lot! 
> 
> My resolution is actually 202.57 PPI, still just over that 200PPI hard limit. 
> 
> Chris
> 
>> On 31 Jan 2016, at 12:00 PM, Chris Sherlock <chris.sherlock79 at gmail.com> wrote:
>> 
>> 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. 
>> 
>> Chris
>> 
>>> On 29 Jan 2016, at 9:39 PM, Tomaž Vajngerl <quikee at gmail.com> wrote:
>>> 
>>> Hi,
>>> 
>>> On Thu, Jan 28, 2016 at 9:52 AM, Chris Sherlock
>>> <chris.sherlock79 at gmail.com> wrote:
>>>> I did a calculation from http://www.sven.de/dpi 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
>> 
>