Eliminates the assumption of any specific metrics from the pen. It still
gives some image without giving any parameters, thus it should be a good
starting point for new users.
There are possibilities that the rendering results may change among
FreeType versions. I've already used the PSNR comparison for cubic
vs quadratic testing, so I applied the same technique and threshold to
all rendering tests to relax assertions. Also handles the case that
MSE becomes zero. Optional dependencies are not needed for the tests.
After experimenting with uharfbuzz for a while, I found out it was hard
to handle top-to-bottom texts, so I gave up an idea to put an ascender
or a descender value in the arguments. Instead, I simply expose 'offset',
'width' and 'height', which is way more straightforward than the
previous design.
In addition, 'contain' option is added to easily compensate and render
glyphs such as combining accents or excessively tall letters.
Part of fixing https://github.com/fonttools/fonttools/issues/2475
Old code was mistakenly only adding the synthetic-generated feature
to the first language-system. In the case of merging Noto Grantha
and Noto Tamil fonts, Noto Tamil had two script systems: 'taml' and
'tml2', and we were adding the synthetic 'locl' feature only to the
DefaultLangSys of the 'taml' script, not the 'tml2' script. That was
the main bug.
A second issue was that the lookup was being added twice to the same
(synthetic) feature. Check before adding lookup, to avoid that.
3.10 is out next week, while 3.6 reaches end of life by the end of this year.
It's time to require 3.7 or greater, so we can finally use built-in dataclasses and more.
Fixes https://github.com/fonttools/fonttools/issues/2350
relying on ClipList.compile to drop unused clips based on updated glyphOrder won't work when font is loaded lazily (default for subsetter), because ClipList gets decompiled too late (after glyphOrder has already been modified) and this produces warnings about missing glyphIDs.
Better to make the subsetter explicilty prune unused clips.
