[webkit-dev] Safari and complex script rendering

Mohammed Sameer msameer at foolab.org
Sun Sep 28 03:44:57 PDT 2008

1) WebKit itself supports complex script rendering.
2) The iPhone edition of WebKit does not support complex scripts.
3) You can't fix the iPhone problem because it's closed and no one can do it but Apple.
4) There's nothing you or we can do to fix the iPhone.
5) Implementing complex scripts support is not easy as plugging some code into a function.

On Sun, Sep 28, 2008 at 12:37:19PM +0200, Sherif wrote:
> Thank you guys for your comments.
> There is a software in the market that installs an edited version of the  
> webcore that makes such letter shaping but its very expensive.
> Please find the attached code, i would like to embed it some where when  
> the html page is loaded to shape the words together.
> It would be greate if somebody guys can point me to the correct function  
> to plug the code in.
> regards,
> Sherif
> Maciej Stachowiak wrote:
>> On Sep 28, 2008, at 1:15 AM, Paul Pedriana wrote:
>>>>> ... this is not a WebCore issue, so there is nothing you can do
>>> in WebCore to fix it.
>>> When I look at WebCore's WidthIterator::advance function, it doesn't
>>> seem to me to be savvy to complex script. It looks to me like it walks
>>> through a Unicode string and replaces character clusters with   
>>> individual
>>> glyphs. This approach works for most scripts but not complex scripts
>>> such as Arabic and Devanagari. The problem, as you may well be   
>>> aware, is
>>> that there are many OpenType-directed substitutions, ligations, and
>>> "un-ligations." This is unrelated to Arabic's RTL nature unrelated to
>>> simply contextual alternates resulting from cursiveness. It seems to  
>>> me
>>> that complex script would have to be supported by something other than
>>> WidthIterator::advance (is it?).
>>> If WebCore (or WebKit in general) supports complex script correctly   
>>> then
>>> I wonder what I am missing regarding the above statements.
>> WebKit on Mac and Windows (and perhaps other ports, haven't tested)   
>> supports complex scripts such as Arabic. But not (currently) the   
>> iPhone port.
>> Regards,
>> Maciej
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Debian User and Developer.
Homepage: www.foolab.org
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