Change the build process to provide more intermediate steps and maintain
intermediate targets. This slows down make's analysis phase, though.
Make can be run with -j to parallelize the building, but be careful
with multiple targets on the command line (e.g. 'make clean font') since
clean's deletion of the output tree can sometimes occur after some of
the output directories get built.
This is preparatory to replacing the png images with the original internal
set. These require a bit more cleanup and processing, which is what these
changes do. The overall flow is:
- convert all emoji to desired size (136x128). All are smaller than this,
most are 128x128 but there are some others.
- run waveflag on the flags
- convert all flags to desired size(136x128). The flags are 128x128
originally.
- 'rename' the flags by creating softlinks with the desired names
- run pngquant on all the images and copy them into a single directory,
this reduces slight antialiasing differences.
- compress all the images, using zopflipng if available, else optipng.
zopflipng saves about 10%, but is 10x slower.
The remaining steps of building the font are unchanged, for the moment.
The intermediate image files are put into a 'build' subdirectory to organize
them and keep them out of the way.
Another way to do this is to create a target, but when I tried that
it reintroduced the dependency analysis problem-- rules with this
dependency always triggered. Of course I might have missed something
subtle. Both the target approach and this approach come from
http://stackoverflow.com/questions/5618615/check-if-a-program-exists-from-a-makefile)
This always runs, but unless you're just running clean you'd always want to
perform this check, so I think that's ok.
This reverts some changes in commit b257b6647d that were causing build
issues. Those changes quoted the path to pngquant in order to deal
with spaces in the path, but as a side effect that prevented
build-dependency analysis (gnu 3.81 on ubuntu) from recognizing that
the .png files didn't need to be built, and so rebuilt them every
time, which takes several minutes. Apparently make doesn't like
quotes-- strings passed to the shell are fine, but things make itself
processes (like names of targets) are treated literally.
Since the path to pngquant is (now, anyway) a local subpath of the
current directory that has no spaces, it should be ok to use the
subpath and not bother to quote.
Another change replaces two dependencies on flag-symlinks with a
dependency on PNG128_FLAGS, for the same reason: after flag-symlinks
executed it was not recognized as being up to date and so the rules
with these dependencies always executed.
The tool and data was moved to nototools.
Makefile now needs to invoke the tool as a script, rather than passing
it to python, since the tool is no longer local. Running setup.py in
nototools will make the script accessible. Setup (apparently) copies
the script to /usr/local/bin and it is not automatically updated when
nototools changes, still need to figure out how to address this.
emoji-data and the code to process it might be useful, but it not
actually used by the tool at present.
The tool currently assumes that all emoji glyphs mapped by the default
cmap share the same presentation.
This script takes ~1 second for startup, so calling it repeatedly for
each flag slows the Makefile considerably, and unnecessarily since it
can be called for all the flags at once.
Now make clean takes about 1.2s, instead of 3m45s.
collect_emoji_svg takes the region-flags data in third_party
and copies/renames it into a target dir, then overlays this with
the data in noto/color_emoji/svg (which also has a few flags in
it).
generate_test_html changes the html to make room for the flag glyphs,
which are a lot wider. It also adds a flag so we can skip regenerating
the .ttx file in case we want to muck with it directly and regenerate
the .woff from that.
svg_builder has a number of changes needed to deal with the much
more varied svg in the region_flags data. See comments in the file
for some of the changes that needed to be made. Some of these
changes are provisional pending clarification of the spec, which
doesn't provide enough guidance.
svg_cleaner is changed slightly to strip width and height, this step
now happens after extract this information from svg in svg_builder,
instead of before.
third_party subdir is for forks/clones of external projects. The svg code
isn't a modification to that project, but an addition to the font-building
code in noto/color_emoji.
This also fixes a slight bug in the html generation, which set the default
large glyph image but forgot to set the hex version of the text below it.
Doug Felt