Re: 2.0.1 bug situation, esp. wrt ZVT

[HideToshi Tajima <hidetoshi tajima sun com>]

Hi Havoc,

Havoc Pennington wrote:

> Toshi - a couple comments on the i18n patch:
>
> - I would not use PangoLayout, it's going to be slow and slightly
>   wrong in terms of what it does to text. you probably want to use
>   Xft directly or close the GTK 2.2 API bug to add a simple "draw
>   string" kind of API to pango
I could understand it may make things slow, but I'm not really sure what 
you mean from
"going to be slightly wrong"? Is this known issue of PangoLayout?

I don't want to use Xft directly - at least don't want to make it an 
only option, so that
it should work in the system not having Xft. Using a simple "draw 
string" API of pango
may be a choice at 2.2, but I'm afraid it cannot be in 2.0.x.

(Above all, I understand using Pango is a way to handle text rendering 
and layout in
GTK+2 and GNOME2. Is it not true specfically in gnome-terminal and 
terminal widget?)

> - you are going to need to handle non-monospaced fonts, because 
>   gnome-terminal has no way to filter things so the user can 
>   only select monospace, at least not yet
Handling non-monospaced fonts would require massive code changes, which 
I'm afraid
it cannot be done in next 4-6 weeks of 2.0.2 timeframe.

The current libzvt i18n patch is written in the expectation that it can 
always be fed with
monospaced fonts - and in multibyte locale cases, it expects the width 
of CJK character
glyphs are exactly twice as that of ASCII character glyphs.

How about having a way to filter some fonts to meet the above 
expectation? Is it possible to
add it in gnome-terminal or somewhere else? How difficuilt could ie be?

> - max_logical_extent on pango fonts is going to tend to be too big
>   for Western locales due to fontsetting
The patch is using pango_font_metrics_get_approximate_digit_width() so 
that it should
decide column width from the width of ASCII digit characters, so it does 
not become
way-big due to fontsetting or the current locale.

Regards,
Toshi