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Re: Complex scripts and gaps in underlining for Text Decoration spec

From: Richard Ishida <ishida@w3.org>
Date: Fri, 01 Mar 2013 14:01:05 +0000
Message-ID: <5130B4A1.70205@w3.org>
To: www-international@w3.org
I suppose these links would have been useful:

Tibetan: 
http://rishida.net/tools/analysestring/index.php?list=%E0%BD%96%E0%BD%A6%E0%BE%92%E0%BE%B1%E0%BD%B4%E0%BD%A2%E0%BC%8B&smallgraphics=on&compact=on&noblock=on&nounicode=on&nonotes=on

Myanmar: 
http://rishida.net/tools/analysestring/index.php?list=+%E1%80%80%E1%80%BC%E1%80%80%E1%80%BA%E1%80%9E%E1%80%BD%E1%80%94%E1%80%BA%E1%80%96%E1%80%BC%E1%80%B0&smallgraphics=on&compact=on&noblock=on&nounicode=on&nonotes=on

RI

On 01/03/2013 13:57, Richard Ishida wrote:
> Hi Fantasai,
>
> Here are a couple of graphics for the note in the text decoration spec
> about the fact that complex scripts require consideration of gaps in
> underline where glyphs are subjoined or combined in some way with others
> nearby: characters that normally wouldn't have an descenders, when
> combined in this way should produce a gap in the underlining, and
> sometimes the visual order of the glyphs doesn't match the order of the
> underlying characters.
>
> The first example is Tibetan.  The characters in the image are:
>
> U+0F56 TIBETAN LETTER BA
>
> U+0F66 TIBETAN LETTER SA
>
> U+0F92 TIBETAN SUBJOINED LETTER GA
>
> U+0FB1 TIBETAN SUBJOINED LETTER YA
>
> U+0F74 TIBETAN VOWEL SIGN U
>
> U+0F62 TIBETAN LETTER RA
>
> U+0F0B TIBETAN MARK INTERSYLLABIC TSHEG
>
>
>
> The second example is Myanmar:
>
> U+1000 MYANMAR LETTER KA
>
> U+103C MYANMAR CONSONANT SIGN MEDIAL RA
>
> U+1000 MYANMAR LETTER KA
>
> U+103A MYANMAR SIGN ASAT
>
> U+101E MYANMAR LETTER SA
>
> U+103D MYANMAR CONSONANT SIGN MEDIAL WA
>
> U+1014 MYANMAR LETTER NA
>
> U+103A MYANMAR SIGN ASAT
>
> U+1016 MYANMAR LETTER PHA
>
> U+103C MYANMAR CONSONANT SIGN MEDIAL RA
>
> U+1030 MYANMAR VOWEL SIGN UU
>
>
> Note that in this case, the same character RA (the square one) has
> different widths, dependingo on the visual context, and also begins to
> be drawn to the left of the character it follows in the text stream.
>
>
> I left lots of white space around the glyphs so that you can crop as you
> prefer.
>
>
> Hope that helps,
>
> RI
>
>
>


-- 
Richard Ishida, W3C
http://rishida.net/
Received on Friday, 1 March 2013 14:01:28 GMT

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