[scribus] right-alignment bug

[JLuc]

Le 22/05/2014 19:18, ZASKE Martin a écrit :
> So what he has got to say, might be relevant for this bug. I paste it
> here for the list, so that one or two other users can have their say,
> before it gets summarized and submitted to "the people in the engine
> room" (who got my utmost respect). Maybe JLuc would know how to submit
> such information, or do I just paste it as another "note" at the
> bug-tracking site? Will it be found there?

Yes.
Best would be to paste in the bug tracker, as a comment of your bug report,
your friend's description of his tweak and his subsequent clear analysis.

JLuc


> ---- Here some extracts from our exchange: ----
>
> On 2014-05-21 at 15:28 Martin Zaske wrote:
>> Hi Bob,
>>
>> I am really exited about your suspicion. Of course I am willing to
> test since we are benefiting from your help. .......
>> Whatever you tweaked in the copy of Charis, it makes the right-align
> bug in Scribus "go away".
>
> That's good news!
>
>> Normally (with the bug) each right-aligned line shows one unwanted
> right-side-space (except the very last line). With your modified version
> it behaves better. ......
>>
>> Now I would like to ask you "how you did it", please. Maybe you could
> briefly write up your tweak in "font-developer-speak", so that I can
> post it on the Scribus list and on the Scribus bug-management-site, for
> the benefit of the Scribus users, and developers and other font makers.
>
> My suspicions are that Scribus is "drawing" the glyphs not only for the
> text of your lines, but also at least the "carriage return" character
> (U+000D) and possibly the "linefeed" character (U+000A). Most
> applications don't actually draw these characters (unless the user turns
> on special "show invisible" or similar options that the app might
> support) but rather just performs the necessary re-positioning that
> would be indicated by the CR or LF.
>
> Actually drawing the CR/LF characters wouldn't be a problem -- UNLESS
> the font being rendered had real glyphs encoded to the CR or LF
> characters. As it turns out, Charis and Andika (and a number of other of
> our fonts) *do* have a glyph encoded for the CR character. This isn't a
> violation of any technical specification, and it hasn't (until now) been
> a problem.
>
> Thus my guess is that all the fonts you are having trouble with have a
> glyph encoded for the CR and/or LF characters and the fonts that "work"
> do not encode those.
>
> What I tweaked in the font I sent  you was to remove the CR character
> from the font (LF wasn't present anyway).
>
>> Would you consider this an issue which should rather be "fixed" at the
> font-side of things, or rather at the text-rendering (in Scribus) side
> of things?
>
> As you might deduce from the above description, I think it could be
> "fixed" either way. One could change Scribus so that it doesn't
> physically draw the CR/LF glyphs, or one can patch all the affected
> fonts so they don't encode those characters.
>
> Assuming my understanding is correct, then making the change to Scribus
> would be a universal fix. But there may be reasons that the Scribus
> folks don't want to make this change, in which case you are dependent on
> font vendors to fix all the fonts that you are interested in.
>
> Hope this helps
> Bob
>
> ---- end of extract ----
>
> So, we got more information now. And as this goes beyond my level, I
> would like to hear from people who know about the Scribus text rendering
> engine: Are we on the right track?
>
> fwiw,
>
> Martin
>
>
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