[Lazarus] Arabic beta tester for SynEdit needed
Martin
lazarus at mfriebe.de
Fri Dec 7 04:25:14 CET 2012
On 07/12/2012 02:38, Mattias Gaertner wrote:
> On Thu, 06 Dec 2012 22:53:12 +0000
> Martin <lazarus at mfriebe.de> wrote:
>> [...]
>> I need feedback from people who actually speak (or at least read and
>> write) Arabic. I need to know, if the above situation is "useable".
> Attached is a small example text and a screenshot showing, how Firefox
> with font "serif"renders it, how synedit with "Courier New" renders it
> and how synedit with "monospace" renders it.
>
> Firefox and the "monospace" synedit shows only one
> ligature (??), combined of the two codepoints alif ? and lam ?.
> Firefox allows to select the two independently.
>
> The "courier new" font shows another ligature:
> The ??? are three letters in "monospace", while with "courier new" it
> shows the two rightmost combined as one.
>
Was the synedit picture taken with extra char spacing? Because without
that, you get the wrong behaviour (select line, char by char)
I know how it should be shown ideally.
The question is how far away from ideal would still be useful? And that
I can not tell for a script, that I do not use at all.
Someone once said, some editors display the ligatures, as 2 chars. And
that would be accepted by many people. But I can not judge that.
The proper ligature handling is a lot more work. And it depends on the
font (or it may at least) On windows there is an API, that would allow
to get that info. However if not carefully done, it may have effect on
the speed of synedit (quite possible noticeable).
On others, I wouldn't even know where to look for such an API. But
little point, until SynEdit is ready to use an external API in this
place. (That is it does not call it excessively)
As for placing the caret in the middle of a char, that would require 90%
of the work to render proportional fonts (on the list, but not now)
Below is with extra char spacing, and you can see a stretched bit of
horizontal line
Without the etra char spacing, there is a gap, between the RTL and the
LTR spaces atthe end (use visible spaces, r type real latin text at the
end).
Delete half the ligature, and it will go away, causing the LTR text to
move, even so the RTL has still the same length (ligature replaced by
remaining normal char)
So at the moment for synEdit the ligature are 2 chars, they must take to
cells on screen.
The point is. It might be some time until I can add proper ligature
handling.
But I can try to get the current behaviour without the extra char
spacing (if that current behaviour is of any use).
It might be possible to force the splitting of the ligature, I do not
know that for sure. Also GTK2 will probably split it, others I do not
know. (GTK2, will have to pain every char on its own.)
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