W3C home > Mailing lists > Public > public-houdini@w3.org > February 2015

Re: Font Metrics concerns

From: John Daggett <jdaggett@mozilla.com>
Date: Mon, 9 Feb 2015 21:35:25 +0900
Message-ID: <CALYZoVPdPbRwf_3TjXXLqDUkTLgnbQ754LTo6vFkBvwm6+vG6Q@mail.gmail.com>
To: Stephen Zilles <szilles@adobe.com>
Cc: Alan Stearns <stearns@adobe.com>, Chris Lilley <chris@w3.org>, "Tab Atkins Jr." <jackalmage@gmail.com>, "public-houdini@w3.org" <public-houdini@w3.org>, Bram Stein <stein@adobe.com>
I don't think defining an API for font metrics is the right place to start.
First off, you're really probably talking about some form of *line* metrics
rather than actual font metrics. A linebox can be affected by both font
metrics and other factors such as the variation in font-size across a line
and other content (e.g. an image larger than the line height).

Even knowing the fonts used for specific glyph runs across a line does
*not* give you the information needed for proper placement.


  font-family: Arial, sans-serif;


In this case the line metrics will be those of Arial and not the fallback
font used to display the Japanese characters in the run.



Here the placement of x will *not* be purely based on the font metrics used
for the 'x' character but will be affected by the linebox height when the
synthetic superscript is taken into account.


Received on Monday, 9 February 2015 12:35:53 UTC

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