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Re: face-attribute returns wrong foreground color for inheriting face.

From: David Kastrup
Subject: Re: face-attribute returns wrong foreground color for inheriting face.
Date: 28 Oct 2001 14:50:05 +0100

>>>>> "Miles" == Miles Bader <address@hidden> writes:

    Miles> address@hidden (David Kastrup) writes:
    >> What happens if the font defines a *relative* value for an attribute?
    >> Will the :inherit tree be consulted for further resolution of that
    >> size?

    Miles> Yes

    >> If so, in case it leads to relative specs again, what will be taken
    >> into account?  The first path resolving to a relative or absolute
    >> value only, or will the entire :inherit tree be merged with regard to
    >> relative sizes?

    Miles> Multiple relative heights will be merged until the height
    Miles> becomes absolute, in the same manner that display face
    Miles> merging operates (or at least, that's the intent).

    Miles> E.g. the `Info-title-*-face' faces are a hierarchy of
    Miles> inherited faces where each level scales the height of the
    Miles> previous level by 1.2, and in my emacs, the last level
    Miles> scales by 1.1:

    Miles>    (face-attribute 'Info-title-1-face :height nil nil)
    Miles>    1.2
    Miles>    (face-attribute 'Info-title-1-face :height nil t)
    Miles>    1.9008
    Miles>    (face-attribute 'Info-title-1-face :height nil 'default)
    Miles>    237

That does not answer my question at all.  Of course relative heights
along a single line of heritage are combined.  My question was what
happens to relative heights on separate branches.

Namely if I have in a face the specification
:inherit '(parent1 parent2)
and both parent1 and parent2 have relative height specifications (or
assume that parent1 has relative and parent2 absolute height
specification), will the result be a combination of the two, or just
that from parent1?

I think the latter more logical, since I would find it strange to
combine size specs from different lines of heritage.

According to that terminology, I would think that the INHERIT argument
should correspond to a *single* line of heritage in that relative size
specs in it are *combined*.

David Kastrup, Kriemhildstr. 15, 44793 Bochum
Email: address@hidden

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