[PD] cross platforms issues with displaying fonts in vanilla but not in Purr Data

[Jonathan Wilkes]

> Hey all



> I'm happy that so many people are trying to tackling the font / box
size issue in vanilla now. From what I can tell, box sizes aren't even
consistent within the same Linux distribution.
A program can essentially either resize fonts to fit hard-coded box 
sizes, or it can resize boxes to fit the fonts.  Pd Vanilla does the latter.

> When I switched fromUbuntu 14.04 to 16.04, boxes grew horizontally by one pixel per
character for patches with fontsize=10.
When you switched to 16.04, you started using an updated font 
engine to render the fonts.  As far as I can tell there is no set of rules 
or constraints on the font stack developers to keep font sizing algos 
consistent across time.  I do know that Windows, OSX, and the old 
Gnu font stack sizing algo (i.e., 14.04) were within a pixel of each 
other when measuring the width of a 31-characterfor string of 
DejaVu Sans Mono at a particular pixel size.  The newer Gnu font 
stack rendered a string that was seven pixels wider at the same 
pixel size.

The metrics can vary widely or not at all for a particular font.

-Jonathan
   
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