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RE: [1.2T-LC] i18n comment 8: Text rendering order

From: Richard Ishida <ishida@w3.org>
Date: Thu, 30 Oct 2008 18:45:14 -0000
To: "'Chris Lilley'" <chris@w3.org>, <www-svg@w3.org>
Cc: <public-i18n-core@w3.org>
Message-ID: <00b001c93abf$a5e8c5f0$f1ba51d0$@org>

Hi Chris,

I'm pursuing this thread because I know you want to get this stuff wrapped
up.  However, I haven't seen any further correspondence on this topic, and
I'm not sure what the result of the comment is, nor what the impact is on
rendering of what you're describing. 

I don't know whether this helps or hinders: If you had the word 'hindi'
written in hindi (see the example at
http://rishida.net/scripts/tutorial/slides/Slide0670.html), would that mean
that you render the 'h' first, then the 'i' to its left, then the 'n'
diacritic, then the 'd' and finally the 'ii' vowel sign. (I'm assuming here
that differences/overlap, etc are applied on a character by character basis,
however, three of these characters are combining characters, and there are
two grapheme clusters involved, and I don't know how that plays into this.

Cheers,
RI

============
Richard Ishida
Internationalization Lead
W3C (World Wide Web Consortium)

http://www.w3.org/International/
http://rishida.net/



> -----Original Message-----
> From: public-i18n-core-request@w3.org
[mailto:public-i18n-core-request@w3.org]
> On Behalf Of Chris Lilley
> Sent: 13 October 2008 18:55
> To: www-svg@w3.org; public-i18n-core@w3.org
> Subject: Re: [1.2T-LC] i18n comment 8: Text rendering order
> 
> 
> Hello www-svg,
> 
> 
> > "The glyphs associated with the characters within text content block
> > elements are rendered in the logical order of the characters in the
> > original document, independent of any re-ordering necessary to
> > implement bidirectionality. Thus, for text that goes right-to-left
> > visually, the glyphs associated with the rightmost character are
> > rendered before the glyphs associated with the other characters"
> 
> This is my own viewpoint and has not yet been discussed with the WG.
> 
> Good catch about other reasons for reordering besides bidi. I agree
> the current text suggests its the only reason for reordering. Would
> this text be better?
> 
>   "The glyphs associated with the characters within text content block
>   elements are rendered in the logical order of the characters in the
>   original document, independent of any re-ordering necessary for
>   visual display (e.g., to implement bidirectionality). Thus, for text
>   that goes right-to-left visually, the glyphs associated with the
>   rightmost character are rendered before the glyphs associated with
>   the other characters, as they come earlier in logical order."
> 
> The reason we need to describe rendering order is to cover the case
> where glyphs overlap, have different colours, and use transparency. In
> that case, the rendering order affects the visual result.
> 
> 
> --
>  Chris Lilley                    mailto:chris@w3.org
>  Technical Director, Interaction Domain
>  W3C Graphics Activity Lead
>  Co-Chair, W3C Hypertext CG
Received on Thursday, 30 October 2008 18:45:19 GMT

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