Re: XML file format - Linux vs Windows

[Cyrille Chepelov <cyrille chepelov org>]

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)):
                                break
                        else:
                                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
        renderer->set_font(renderer,font,nominal_height,scaling_factor);

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

Does that sound good or rubbish ?

        -- Cyrille

-- 
Grumpf.