Allow variable scaler in ligature caret position and build
CaretValueFormat3 with DeviceTable. Does not support non-variable device
table, but can be added if someone really really wants it.
* Add default auto doc options
* Ensure all references are unique
* Use anonymous links to avoid duplicate references
* Remove default options, fix wrong module name
* Don’t index repeated class
* Remove repeated classes included through automodule
* Fix warnings
* We don’t use our own static directory
* Correctly format XML in docs
* Fix indentation
* Fix overline
* Bring TOC to top
* Fix definition list
* Offset definition lists and examples
* Fix erroneous markup
* Fix markup
* Already included in automodule
* Fix args markup
* Correct markup for example
* Don’t reindex repeated module
* Correct XML code block markup
* Fix markup errors, change example to doctest
* Correct list markup
* Make ttx docstring both valid RST and valid help output
* Various other boring markup fixes
* Fix example indenting
* Make docstring valid RST and valid help output
* Mock import for reportlab
* It’s ok if manual links don’t appear in toctrees
* Oops typo, I guess doctests are useful
See pull request: https://github.com/fonttools/fonttools/pull/2326
The new module `otlLib.optimize.gpos` provides `compact` functions that
can reduce the file size of GPOS PairPos lookups by splitting subtables
in a smart way to avoid storing zero-valued pairs.
The compaction methods are called from `otlLib.builder` and
`varLib.merger` so that static and variable fonts can benefit from the
optimization at compile time.
The new module `otlLib.optimize` is also executable, to allow running
the optimization on existing fonts.
The optimization is a trade-off because on the one hand it can reduce
significantly the byte size of the GPOS table (up to 50% in random
Google Fonts) but on the other hand it adds to the compilation time and
may make fonts very slightly bigger once compressed to WOFF2 (because
WOFF2 doesn't mind about zero values and compresses them very well).
As such, the optimization is off by default, and you can activate it by
providing the environment variable `FONTTOOLS_GPOS_COMPACT_MODE=5` for
example (values from 0 = off to 9 = max file size savings, but many more
subtables).
Previously otlLib was generating None if the values themselves were
empty even if the value format was non-empty. This happened to work
for compiling to binary since the compiler handles Value=None.
But this was confusing varLib.merger module (as in when building
variable fonts from such otlLib-built master GSUB/GPOS tables, without
roundtripping to OTF/TTF binary first), because in varLib.merger,
a None means "this master doesn't provide that info; skip it"; whereas
in a PairPos table a None as generated by otlLib simply meant "all
values are zero", which is different from "this master doesn't
provide this value".
This fixes that, such that ufo2ft can build variable-font without
saving masters to binary.
Part of https://github.com/googlefonts/ufo2ft/pull/486
