From: Dom Lachowicz (domlachowicz@yahoo.com)
Date: Sat Oct 25 2003 - 16:19:14 EDT
I know that I've said this before, but I will be
looking into this next week hopefully. 2.0.1 should
still go out regardless - we can release 2.0.2 as soon
as this bit of work gets done. Please feel free to
help out or beat me to this.
I believe that the "right" solution is to have tdu/tlu
consistently round in one direction (down) PLUS
working inside of the layout classes to do all of the
math bits in a numerically stable way.
Dom
--- Tomas Frydrych <tomasfrydrych@yahoo.co.uk> wrote:
>
> Bug 5619 (and several duplicates) concerns
> non-joining of Arabic
> letters: where in the script letters are supposed to
> be joined
> without a gap, we now have small white gaps between
> them; this did
> not use to be the case up to 1.99.1, and is caused
> by rounding errors
> in the graphics classes. It is a fairly serious
> problem, which I
> think needs to be addressed, but that will require
> revisiting some of
> the old issues.
>
> I think the only solution to this particular problem
> is to ensure
> that the lu->du conversion rounds down. This would
> not affect zooming
> as long as the zoom factor is applied _after_ the
> rounding, not
> before it, but unfortunately, systematic truncation
> of character
> widths leads to serious cumulative errors over the
> width of a line,
> which we are well familiar with from the past, and
> which need to be
> avoided.
>
> So I have the following suggestion: we
> systematically truncate
> character widths and then compensate for the
> cumulative error by
> inflating spaces on the line. We basically have the
> mechanism in
> place, since that is how we do justification, and so
> relatively
> little code should be needed for this.
>
> (The only other solution I can think of is to avoid
> upwards rounding
> selectivly for such characters with which it
> matters. While it would
> be doable, it would me much more messy and
> computationally
> intensive.)
>
> Anyway, I would appreciate some comments or
> alternative solutions.
>
> Tomas
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