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Shaping
=======
Layout Driver
=============
The PangoLayout object is a highlevel driver that takes an attributed
string and produces lines of glyphs.
* Figure out better ways of doing line breaks. (This may involve
implementing the TeX/Raph x0-x1 stuff for line breaks.)
* Add spacing parameter as illustrated; this should be a quick
(10 minute) addition.
* Although PangoLayout isn't intended to handle large amounts
of text, it should be able to handle embedded "\n" and simple
multiple paragraphs. This could be done entirely within
pango_layout_check_lines()
* pango_layout_context_changed() is a hack. Either the context
should have change-notification, or else the layout should
make a copy of the context when the context is set.
* optimize right alignment for width == -1 and only a single
line. (Currently this causes a useless call to gtk_layout_get_extents.)
X rendering
===========
* Right now we assume a single resolution for all fonts on a display;
but in theory, the resolution could be per-screen. To solve
this, we would probably want to add a window argument to
pango_x_get_context() and then have some sort of X specific font
loading interface.
* It is not clear that X is interpreting the ink_rect the same way
as we are. There is a bit of fudging in the underline drawing
code to deal with this and make the underlines look symetric.
* pangox.c/get_font_metrics_from_string() needs to gutted and
replaced with using pango_itemize(); to support this, we need
the ability to specifiy a particular font to use when itemizing.
This probably means adding a attribute type which contains
a PangoFont *, and overrides the description.
* pangox.c needs to be split into at least two separate files.
(
Probably along the lines of
1) font map
2) font
3) rendering
)
Other rendering engines
=======================
* Somebody should start working on a libart font-system / renderer
soon, to make sure that the interfaces are suitable.
* FreeType-2.0 support could be very interesting, with the OpenType
that it has.
Engines
=======
* Switch engines to be indentified by properties, instead
of hardcoded role/language. (?)
Language Modules
================
* It would be nice to have X based shapers for a few more scripts;
Hindi is one obvious need. (Actually, there may be a need for
a generic framework for Indic shapers to be developed. A
libpango-indic...)
* Once we have a libart renderer, porting Raph's devanagari shaper
to Pango and C (from Perl) would be a cool demo and test case.
* The clusters set by the current modules need to be set.
* Tamil module should be switched over to libunicode from utils.c stuff.
Documentation
=============
* Much or all of the X Fonts document from pango.org needs to be moved
into the API reference.
Fonts
=====
* Add handling for baseline adjustment
* pango_context_list_fonts() does not properly suppress duplicates
when multiple font maps are involved
General
=======
* unicode_next_utf8() is extensively used on strings which are not
guaranteed to be NULL terminated. This is a BUG. Once I agree
with Tom Tromey on a change to libunicode to make the operation
more efficient, these need to be gone through one-by-one.
* Remove the extraneous font argument from the script_shape virtual function
in ShapeEngine.
* rename pango_context_set_size() to pango_context_set_font_size()
* settle on either _free or _destroy
* PangoAttrList currently takes the policy of "most recent wins"
when multiple attributes of the same type are present for a range.
It would map better on the TkText tag-based API if attributes
also had a depth/priority and "most recent wins" only applied
for attributes of the same priority.
* Add a "make test" target to examples/, add environment variables
to point to module and font alias files, remove the code that
loads these from the current directory. (There are security
implications with the current stuff)
* Report errors from functions, these errors include such things.
- Invalid string
- Font does not match
Probably the right thing to do here is to use something very close
to the GConf API ... see Havoc's GException proposal.
* Allow UTF8 strings with embedded NULLs.
* Write a small default shaping engine that only
draws a placeholder character ... and does that in
a way that always works.
* Finish coverting over from utils.c to Tom Tromey's libunicode.
Add the remaining useful functions from utils.c into libunicode.
* s/num_chars/n_chars/ etc. (Always use n_ as enumeration prefix)
* Fix handling of 'trailing' in x_to_index() to handle clusters
with more than one character where positioning is not allowed
inside the cluster. Uniscript sets trailing as 0 or number of j
characters in the glyph. (Trailing is currently a boolean
for us.)
* pango_font_get_metrics() currently takes a language tag, but
really uses that to find out one or more _scripts_; should we
define script tags and put those (optionally?) in the
interface?
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