Review Request 119983: Use font metrics to scale icons for high dpi outputs

[Sebastian Kügler]

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https://git.reviewboard.kde.org/r/119983/
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Review request for Plasma, Kai Uwe Broulik, David Edmundson, and Vishesh Handa.


Bugs: 337712 and 338308
    http://bugs.kde.org/show_bug.cgi?id=337712
    http://bugs.kde.org/show_bug.cgi?id=338308


Repository: plasma-framework


Description
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Use font metrics to scale icons for high dpi outputs

QScreen, through EDID reports bogus values for physicalDotsPerInch*().
This leads to oversized icons on monitors with bogus edid information.

This patch changes the ratio underlying to the icon sizing for displays
with a DPI > 96 * 1.5 to use the ratio between the font as rendered (its
effective pixelSize, essentially) to scale the icon sizes up.

As we rely on proper font metrics throughout already, this should bring
sizing in line with the font, which is something that makes sense as it
means we're sharing the underlying mechanism (font metrics) for sizing
in different areas.

The downside of this patch is that we're essentially working around an
issue that should be fixed in the hardware, the monitor's edid.
Unrealistic.

print dpi / sizing in dpitest

Print out some useful information to deduce dpi and pixel sizing.

David, and Kai Uwe, Vishesh (since I know you have a high DPI displays), 
could you run this patch for a bit and check if it works for you, too?

I've pushed it to plasma-framework[sebas/dpi] for your git convenience.


Diffs
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  src/declarativeimports/core/units.h ba481781a04a54cb77f99048d3d400fdae617b38 
  src/declarativeimports/core/units.cpp 56c0b55427c128beff5f8d18c37847a435f194c0 
  tests/dpi/dpitest.cpp c3d2c3e6821fd79fc8b5ed0b3559a5870f88aa36 

Diff: https://git.reviewboard.kde.org/r/119983/diff/


Testing
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Ran Plasma Desktop, no apparent problems (on this hardware, which worked, anyway).


Thanks,

Sebastian Kügler

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