[Indic-computing-devel] X vs. Open Type

[Tapan S. P. <ta...@ya...>]

> The proposed new algorithm:
>
> FindPosition(textpos, startx, pixel_width)
> // Make a single request to the X Server - this doesn't exist in
> // the X protocol yet
> nchars = XComputeWidth(textbuf[textpos:end-of-line], startx, pixel_width,
>                // other args font etc)
>
> // everything starting from textpos to textpos + nchars is "selected"
>

Is textbuf supposed to be modified and returned by XComputeWidth?
Otherwise it seems with reordering there may be some problems at the
boundaries where chars are reordered.

Two things I am noticing...

1) My knowledge of X and its design decisions is inadequate.

2) From this inadequate knowledge, it seems to me that the philosophies of
Open Type Fonts / True Type Fonts and X may not match so well together, in
that the X Server expects clients to send glyph codes, but fonts are
maintained server-side (not a big deal if char codes _are_ glyph codes),
while in the TTF/OTF world, the font files contain the neccesary
information for doing char-glyph mapping.  It seems in X both Server and
Client would need open type font info (the client for doing char->glyph
mapping, the server for doing rfendering, positioning, etc.) Somewhat of  a
catch-22, or am I missing something?

--tapan



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