Re: Getting Font Metrics with ATS

• Subject: Re: Getting Font Metrics with ATS
• From: "Takehiko Abe" <email@hidden>
• Date: Thu, 24 Nov 2005 20:05:27 +0900
• Delivered-to: email@hidden
• Delivered-to: email@hidden

Cyril Murzin wrote:

> Would someone be so kind to explain it? I've read: "If one or more
> measurements are not available for a font, then the appropriate
> fields in the ATSFontMetrics data structure are set to 0." How is
> it possible for ascent or descent values?

There are two font metrics getters: ATSFontGetHorizontalMetrics
and ATSFontGetVerticalMetrics. That implies that we have two sets
of ascent/descent values -- horizontal and vertical.

And it appears that the 'vertical' ascent/descent values are not
usual ascent/descent that many of us are familar with:

* ATSFontGetVerticalMetrics + Osaka font

  ASCENT 0.5
  DESCENT -0.5

* ATSFontGetHorizontalMetrics + Osaka font

  ASCENT 1.0
  DESCENT -0.25

* GetFontInfo + Osaka 12

  ASCENT 12
  DESCENT 3

My /guess/ is that the vertical variants are used (in a way
I do not know) when the lines of text are rendered
vertically
           L
           I
           K
           E

           T
           H
           I
           S
           .


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