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Freeze variations and features in font.

Home Page: https://mutsuntsai.github.io/fontfreeze/

License: MIT License

HTML 25.50% JavaScript 27.35% Python 26.34% TypeScript 13.92% SCSS 6.89%

font fonts typeface opentype truetype

fontfreeze's Introduction

Mu-Tsun Tsai 蔡牧村

Hello, I'm a full stack developer from Taiwan 🇹🇼. I've been coding for 30 years and I'm a big fan of open source projects. I am also an origami artist as well as an origami design theory scientist.

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fontfreeze's Issues

[Feature] Actual glyph substitution

This is related to issue #1 that OpenType features are not natively supported in some environments such as Notepad++. For maximal compatibility, we should substitute the actual glyph if the feature being activated involves just a single character. I guess I will make that as an option which is on by default.

Suggestion: Read the font family from the font

Currently we can only use 4 font styles with this tool: Regular, Italic, Bold, Bold Italic.

It would be good if the tool could just read the font style from the uploaded font instead of having the user to select one of the four.

This is not that critically as I'm currently fine with the default ones but there are many fonts like Cascadia Code/Mono and JetBrains Mono that have different styles like Light, Semi Bold etc..

Support additional font weights

Feature request: possibility of baking in line height

Use-case: If you customize fonts like Input you'd find that they let you bake in line height as well. This is useful in the cases where modifying line height in an app has an odd effect (eg. in Kitty app, line height produces unintended spacing at the top and bottom of the terminal) or modifying line height properly isn't possible (eg. Emacs). It'd be great if Fontfreeze lets you bake that in as well.

OverflowError: unsigned byte integer is greater than maximum

I am using font MapleMono https://github.com/subframe7536/Maple-font/releases/tag/v6.2
and I see this issue

glyphs disabled for Fira Code v6.2

Hi,
I tried freezing with the following glyph settings, when downloaded the glyps for !=,==, =>, -> etc are all disabled,, or not working.

I'd like to know if I'm doing any mistake.

Thanks!

Exception while saving Source Code Pro font

I get the following exception when I try to freeze Source Code Pro.

An error occur: Traceback (most recent call last):
  File "<exec>", line 154, in processFont
  File "<exec>", line 157, in main
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 212, in save
    writer_reordersTables = self._save(tmp)
                            ^^^^^^^^^^^^^^^
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 259, in _save
    self._writeTable(tag, writer, done, tableCache)
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 711, in _writeTable
    tabledata = self.getTableData(tag)
                ^^^^^^^^^^^^^^^^^^^^^^
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 733, in getTableData
    return self.tables[tag].compile(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/otBase.py", line 155, in compile
    self.table.compile(writer, font)
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/otBase.py", line 1089, in compile
    conv.write(writer, font, table, value)
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/otConverters.py", line 754, in write
    value.compile(subWriter, font)
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/otBase.py", line 1051, in compile
    conv.writeArray(writer, font, table, value)
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/otConverters.py", line 216, in writeArray
    self.write(writer, font, tableDict, value, i)
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/otConverters.py", line 634, in write
    value.compile(writer, font)
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/otBase.py", line 1089, in compile
    conv.write(writer, font, table, value)
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/otConverters.py", line 754, in write
    value.compile(subWriter, font)
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/otBase.py", line 1089, in compile
    conv.write(writer, font, table, value)
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/otConverters.py", line 754, in write
    value.compile(subWriter, font)
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/otTables.py", line 517, in compile
    featureParamTypes.get(writer["FeatureTag"]) == self.__class__
AssertionError: ("Wrong FeatureParams type for feature 'calt': FeatureParamsStylisticSet", 'FeatureParamsStylisticSet', 'Feature', 237, 'FeatureRecord[]', 'FeatureList')

Steps to reproduce:

Download the ttf version of the font: https://github.com/adobe-fonts/source-code-pro/releases/tag/2.042R-u%2F1.062R-i%2F1.026R-vf
Load SourceCodePro-Regular.ttf in the freezer
Select ss07 or any other stylistic set
Click "Generate font!"
You will get the exception and a 0 byte file is saved to the system.

I tried this with Firefox, Chrome and Edge.

font subfamily support

Hello,

I used the tool to generate a full set of variations and it worked as expected, except for the subfamily and/or style setting.

For instance I'm unable to set the following subfamilies:

light
retina
medium

Exception while saving Maple Mono NF

Here is the github repo for the font

Here is the error message:

Error: Traceback (most recent call last):
  File "<exec>", line 156, in processFont
  File "<exec>", line 159, in main
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 212, in save
    writer_reordersTables = self._save(tmp)
                            ^^^^^^^^^^^^^^^
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 259, in _save
    self._writeTable(tag, writer, done, tableCache)
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 711, in _writeTable
    tabledata = self.getTableData(tag)
                ^^^^^^^^^^^^^^^^^^^^^^
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 733, in getTableData
    return self.tables[tag].compile(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/_c_m_a_p.py", line 207, in compile
    chunk = table.compile(ttFont)
            ^^^^^^^^^^^^^^^^^^^^^
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/_c_m_a_p.py", line 400, in compile
    gids = array.array("B", valueList)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
OverflowError: unsigned byte integer is greater than maximum

    at i.port1.onmessage (main.js:1:1432)

Procedure to reproduce the error (by edge or firefox):

download the newest version of maple mono font and open it
select any of cv01~cv04 feature
generate the font with Apply substitution by single-glyph features. selected and get the error

Btw, the fontfreezer works well with the older version font.

Exception when freezing "cv" features on fonts missing "calt" table.

This is a great tool to "freeze" the open types features of a font, but I've encountered some errors in freezing "cv" features on some fonts, where the "calt" table is not present, similar to the issue that another user found with freezing "ss" features on such fonts which you have already fixed.

Steps to reproduce:

Download the ttf version of the font: https://github.com/adobe-fonts/source-code-pro/releases/tag/2.042R-u%2F1.062R-i%2F1.026R-vf
Load SourceCodePro-Regular.ttf in the freezer
Select cv01 or any other character variant
Click "Generate font!"
A python exception occurs

I would perhaps tentatively suggest the following fix to main.py.

In the code dealing with "no existing one", insert featureParamTypes[self.target] = FeatureParamsStylisticSet if featureRecord.FeatureTag.startswith("ss") else FeatureParamsCharacterVariants before featureRecord.FeatureTag = self.target.
Update the imports to include FeatureParamsCharacterVariants.
The line that previously set featureParamTypes['calt'] can be removed.

Does not work as expected

I tried freezing couple of features (use alternate variant of @ and &) of fira font, but in the generated ttf file both the glyps are still same as the default variant.

[Bug] got an error when generating font

the settings

and my font file:
MapleMonoSCNFNerdFont-Regular.ttf.zip

then I got an error:

An error occur: Traceback (most recent call last):
  File "<exec>", line 154, in processFont
  File "<exec>", line 157, in main
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 212, in save
    writer_reordersTables = self._save(tmp)
                            ^^^^^^^^^^^^^^^
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 259, in _save
    self._writeTable(tag, writer, done, tableCache)
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 711, in _writeTable
    tabledata = self.getTableData(tag)
                ^^^^^^^^^^^^^^^^^^^^^^
  File "/lib/python3.11/site-packages/fontTools/ttLib/ttFont.py", line 733, in getTableData
    return self.tables[tag].compile(self)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib/python3.11/site-packages/fontTools/ttLib/tables/O_S_2f_2.py", line 161, in compile
    self.panose = sstruct.pack(panoseFormat, self.panose)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib/python3.11/site-packages/fontTools/misc/sstruct.py", line 66, in pack
    obj = obj.__dict__
          ^^^^^^^^^^^^
AttributeError: 'str' object has no attribute '__dict__'

Error when trying to freeze JetBrains Mono

I get the following error when I try to freeze the current version (2.303) of JetBrains Mono:

An error occur: Traceback (most recent call last):
  File "<exec>", line 145, in processFont
  File "<exec>", line 149, in main
  File "/lib/python3.10/site-packages/fontTools/ttLib/ttFont.py", line 184, in save
    writer_reordersTables = self._save(tmp)
  File "/lib/python3.10/site-packages/fontTools/ttLib/ttFont.py", line 224, in _save
    self._writeTable(tag, writer, done, tableCache)
  File "/lib/python3.10/site-packages/fontTools/ttLib/ttFont.py", line 647, in _writeTable
    tabledata = self.getTableData(tag)
  File "/lib/python3.10/site-packages/fontTools/ttLib/ttFont.py", line 669, in getTableData
    return self.tables[tag].compile(self)
  File "/lib/python3.10/site-packages/fontTools/ttLib/tables/otBase.py", line 103, in compile
    self.table.compile(writer, font)
  File "/lib/python3.10/site-packages/fontTools/ttLib/tables/otBase.py", line 940, in compile
    conv.write(writer, font, table, value)
  File "/lib/python3.10/site-packages/fontTools/ttLib/tables/otConverters.py", line 631, in write
    value.compile(subWriter, font)
  File "/lib/python3.10/site-packages/fontTools/ttLib/tables/otBase.py", line 904, in compile
    conv.writeArray(writer, font, table, value)
  File "/lib/python3.10/site-packages/fontTools/ttLib/tables/otConverters.py", line 197, in writeArray
    self.write(writer, font, tableDict, value, i)
  File "/lib/python3.10/site-packages/fontTools/ttLib/tables/otConverters.py", line 510, in write
    value.compile(writer, font)
  File "/lib/python3.10/site-packages/fontTools/ttLib/tables/otBase.py", line 940, in compile
    conv.write(writer, font, table, value)
  File "/lib/python3.10/site-packages/fontTools/ttLib/tables/otConverters.py", line 631, in write
    value.compile(subWriter, font)
  File "/lib/python3.10/site-packages/fontTools/ttLib/tables/otBase.py", line 940, in compile
    conv.write(writer, font, table, value)
  File "/lib/python3.10/site-packages/fontTools/ttLib/tables/otConverters.py", line 631, in write
    value.compile(subWriter, font)
  File "/lib/python3.10/site-packages/fontTools/ttLib/tables/otTables.py", line 498, in compile
    assert featureParamTypes.get(writer['FeatureTag']) == self.__class__, "Wrong FeatureParams type for feature '%s': %s" % (writer['FeatureTag'], self.__class__.__name__)
AssertionError: ("Wrong FeatureParams type for feature 'DELT': FeatureParamsStylisticSet", 'FeatureParamsStylisticSet', 'Feature', 38, 'FeatureRecord[]', 'FeatureList')

I used JetBrainsMono-Regular.ttf and checked ss19 and zero. I kept everything else as default.