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Re: [css-fonts] definition of synthetic oblique within the 'font-style' property definition

From: fantasai <fantasai.lists@inkedblade.net>
Date: Sun, 12 May 2013 23:59:34 -0700
Message-ID: <51908F56.6090702@inkedblade.net>
To: www-style@w3.org
On 05/12/2013 05:54 PM, John Daggett wrote:
> fantasai wrote:
>
>> As for how the synthesis for font-style should work, here is my
>> proposal:
>>
>>   a. For characters that are missing a vertical alternate glyph,
>>      one is assumed to exist with the same shape as the regular one.
>>   b. Italic/oblique regular glyphs (non-vertical alternates) are
>>      synthesized with a clockwise skew in the horizontal dimension.
>>   c. Italic/oblique vertical alternates (both real and assumed) are
>>      synthesized with a clockwise skew in the vertical dimension.
>>
>> There are no codepoint-specific rules, nor are any needed. We are,
>> exactly as you require, synthesizing a font face without regard to
>> how the individual glyphs will be typeset, and this synthesized font
>> face is then used as input into the font selection algorithm exactly
>> as if it were a real font.
>
> So just to confirm, the display of glyphs from actual faces labeled
> italic or oblique is not affected by this proposal, the glyphs are
> used "as is" without any additional shear operation?

Of course.

> How do different values of the text-orientation property affect the
> obliquing?  e.g. text-orientation: upright

They don't, except insofar as they trigger vertical alternate
substitution, since vertical alternates (real and assumed)
are given a different shear.

> What you're proposing sounds very close to what Microsoft Word /
> Internet Explorer implement currently.  Is what you're proposing
> different in some way?

Not that I know of, but I haven't explored the details of their
implementation.

~fantasai
Received on Monday, 13 May 2013 07:00:07 UTC

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