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Re: Gets vertical skylines from grob stencils (issue 5626052)

From: David Kastrup
Subject: Re: Gets vertical skylines from grob stencils (issue 5626052)
Date: Thu, 01 Mar 2012 12:01:27 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.92 (gnu/linux)

Han-Wen Nienhuys <address@hidden> writes:

> 2012/3/1 Janek Warchoł <address@hidden>:
>> From what i see, the skylines are now more precise than they need to
>> be - every glyph has a skyline of 10 or so boxes, even if it's a
>> single letter! (see attached)
>> I think the proper solution would be to:
>> a) set minimal "step" size to 0.2 staffspace (or more in case of
>> bigger objects)
>> b) change outlines from "stairs" to glued lines (what Joe suggested).
>> This would allow for even less "fragments" for each skyline.
> It's neat that you are generating such precise skylines, but can you
> show places where this makes an appreciable difference for texts?
> You could look into some heuristic that limits the number of boxes
> depending on their shapes, so it creates a single box for most glyphs.
> For example, you could take the box enclosing the glyph and compare
> its area with that of the union of the boxes, and revert to one box if
> the difference is less than X percent.

Percentage of area differences sounds like a recipe for disaster.  Once
one box gets large enough, it will eat every small box in its vicinity
because any single one will not make a large percentual difference.

You have to do things like that by accumulating errors and not forget
them in between.

David Kastrup

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