Re: XML file format - Linux vs Windows

On Tue, 18 Jun 2002, Cyrille Chepelov wrote:
Le Tue, Jun 18, 2002, à 01:37:13PM -0500, Lars Clausen a écrit:

It's not a question of saving the bounding boxes.  The problem is that
the size of the text determines the size of the surrounding box.  If the
text doesn't scale linearly, the size of the box is indeterminate.

By the way, I think I've got a (slow ?) idea on how to perform scaling:

* compute the text extents at scale 100%
* if scale != 100%:
      font_scale = scale.
      while (1):
              compute the text extents for font size (size * font_scale).
              if (computed extents < (scale * 100%_extents)):
                      font_scale *= 0.95

This way, in the worst case, we would display slightly smaller text than
what the scaling factor requires; however, we'd still use a bounding box
linear to the 100% bounding box (thinking about it, with the hinting and all
that stuff, I see no way for text to scale linearly under a certain size).

That might require a little surgery in the Renderers (basically, instead
of calling renderer->set_font(renderer,font,height), we'd call

Same for renderer->get_text_width(), of course.

Does that sound good or rubbish ?

So this way we're sure that the bounding box does contain the text, but the
text will occasionally look too short.  It's an option, I guess.  The
alternative may be to render the font in a big enough size that it's
linear, then scale it down by hand.  Not a pretty solution, but a little
caching can go a long way.


Lars Clausen (| Hårdgrim of Numenor
"I do not agree with a word that you say, but I   |----------------------------
will defend to the death your right to say it."   | Where are we going, and
    --Evelyn Beatrice Hall paraphrasing Voltaire  | what's with the handbasket?

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