Optional Requirements

The fontTools package currently has no (required) external dependencies besides the modules included in the Python Standard Library. However, a few extra dependencies are required by some of its modules, which are needed to unlock optional features. The fonttools PyPI distribution also supports so-called “extras”, i.e. a set of keywords that describe a group of additional dependencies, which can be used when installing via pip, or when specifying a requirement. For example:

pip install fonttools[ufo,lxml,woff,unicode]

This command will install fonttools, as well as the optional dependencies that are required to unlock the extra features named “ufo”, etc.

• Lib/fontTools/misc/etree.py

  The module exports a ElementTree-like API for reading/writing XML files, and allows to use as the backend either the built-in xml.etree module or lxml. The latter is preferred whenever present, as it is generally faster and more secure.

  Extra: lxml

• Lib/fontTools/ttLib/woff2.py

  Module to compress/decompress WOFF 2.0 web fonts; it requires:

  • brotli: Python bindings of the Brotli compression library.

  Extra: woff

• Lib/fontTools/ttLib/sfnt.py

  To better compress WOFF 1.0 web fonts, the following module can be used instead of the built-in zlib library:

  • zopfli: Python bindings of the Zopfli compression library.

  Extra: woff

• Lib/fontTools/unicode.py

  To display the Unicode character names when dumping the cmap table with ttx we use the unicodedata module in the Standard Library. The version included in there varies between different Python versions. To use the latest available data, you can install:

  • unicodedata2: unicodedata backport for Python 3.x updated to the latest Unicode version 18.0.

  Extra: unicode

• Lib/fontTools/varLib/interpolatable.py

  Module for finding wrong contour/component order between different masters. It requires one of the following packages in order to solve the so-called “minimum weight perfect matching problem in bipartite graphs”, or the Assignment problem:

  • scipy: the Scientific Library for Python, which internally uses NumPy arrays and hence is very fast;

  • munkres: a pure-Python module that implements the Hungarian or Kuhn-Munkres algorithm. Slower than SciPy, but useful for minimalistic systems where adding SciPy is undesirable.

  This ensures both performance (via SciPy) and minimal footprint (via Munkres) are possible.

  To plot the results to a PDF or HTML format, you also need to install:

  • pycairo: Python bindings for the Cairo graphics library. Note that wheels are currently only available for Windows, for other platforms see pycairo’s installation instructions.

  Extra: interpolatable

• Lib/fontTools/varLib/plot.py

  Module for visualizing DesignSpaceDocument and resulting VariationModel.

  • matplotlib: 2D plotting library.

  Extra: plot

• Lib/fontTools/misc/symfont.py

  Advanced module for symbolic font statistics analysis; it requires:

  • sympy: the Python library for symbolic mathematics.

  Extra: symfont

• Lib/fontTools/t1Lib.py

  To get the file creator and type of Macintosh PostScript Type 1 fonts on Python 3 you need to install the following module, as the old MacOS module is no longer included in Mac Python:

  • xattr: Python wrapper for extended filesystem attributes (macOS platform only).

  Extra: type1

• Lib/fontTools/ttLib/removeOverlaps.py

  Simplify TrueType glyphs by merging overlapping contours and components.

  • skia-pathops: Python bindings for the Skia library’s PathOps module, performing boolean operations on paths (union, intersection, etc.).

  Extra: pathops

• Lib/fontTools/ufoLib

  Package for reading and writing UFO source files; if available, it will use:

  • fs: (aka pyfilesystem2) filesystem abstraction layer

  for reading and writing UFOs to the local filesystem or zip files (.ufoz), instead of the built-in fontTools.misc.filesystem package. The reader and writer classes can in theory also accept any object compatible the fs.base.FS interface, although not all have been tested.

• Lib/fontTools/pens/cocoaPen.py and Lib/fontTools/pens/quartzPen.py

  Pens for drawing glyphs with Cocoa NSBezierPath or CGPath require:

  • PyObjC: the bridge between Python and the Objective-C runtime (macOS platform only).

• Lib/fontTools/pens/qtPen.py

  Pen for drawing glyphs with Qt’s QPainterPath, requires:

  • PyQt5: Python bindings for the Qt cross platform UI and application toolkit.

• Lib/fontTools/pens/reportLabPen.py

  Pen to drawing glyphs as PNG images, requires:

  • reportlab: Python toolkit for generating PDFs and graphics.

• Lib/fontTools/pens/freetypePen.py

  Pen to drawing glyphs with FreeType as raster images, requires:

  • freetype-py: Python binding for the FreeType library.

• Lib/fontTools/ttLib/tables/otBase.py

  Use the Harfbuzz library to serialize GPOS/GSUB using hb_repack method, requires:

  • uharfbuzz: Streamlined Cython bindings for the harfbuzz shaping engine

  Extra: repacker

4.68.0 (released 2026-10-27)

• [feaLib] Escape " and \ when writing names back out with asFea() in FeatureNameStatement, STATNameStatement and CVParametersNameStatement (#4321).

• [scaleUpem] Also scale the MATH lengths that are not MathValueRecords (DelimitedSubFormulaMinHeight, DisplayOperatorMinHeight, MinConnectorOverlap, etc.) (#4327).

• [cffLib] Inherit the initial CFF2 vsindex from the Private DICT when decompiling, specializing and instancing charstrings, and fix programToCommands miscounting operands when several blend operators precede the first stem or moveto (#4337, #4339).

• [instancer] Round CFF2 outlines and stem hints on absolute positions rather than per relative operand, and keep CFF2 Private DICT blend values at full precision until they are written back (#4338, #4341).

• [cffLib] Preserve CFF2 Private DICT arrays that use more than one blend group (#4346).

• [feaLib] Raise FeatureLibError instead of looping forever on an unclosed OS/2, BASE or STAT table block (#4347).

• [designspaceLib] When a variable font overrides some public.fontInfo keys, merge them with the root-level font info instead of replacing it (#4336, #4340).

• [instancer] Raise an error for FeatureVariations conditions of a format other than the supported axis-range one, instead of silently dropping them (#4348).

• [filesystem] Don’t overwrite an unrelated sibling .zip when writing a .ufoz or other non-.zip archive (#4342).

• [glyf] Fix exponential running time on composite glyphs that reuse the same component at several nesting levels; getCoordinates now raises TTLibError past 65535 composite points (#4325).

• [ttLib] Add support for the beyond-64k tables of the final ISO Open Font Format 5th edition: uppercase companion tables (GLYF, GVAR, HMTX, GSUB/GPOS extended layout, FeatureVariations 1.1, TTC 1.1/2.1, DMAP), a ttLib.beyond64k module and CLI, and support in FontBuilder, merge, subset, instancer, qu2cu, removeOverlaps and scaleUpem (#4097, #2678).

• [VARC] Keep addVarComponent() locations sparse, passing RESET_UNSPECIFIED_AXES via a new keyword-only resetUnspecifiedAxes pen argument (#4349).

• [woff] Require brotli >= 1.2.1 and brotlicffi >= 1.2.1.0, which fix GHSA-9v8h-qqgm-4m35 (#4365, #4370).

• Build Windows ARM64 wheels (#4366).

• [instancer] Fix AttributeError: ElidedFallbackNameID when updating font names of a font with a version 1.0 STAT table; fall back to the subfamily name (#2933, #4371).

4.67.0 (released 2026-10-14)

• [varLib] Support decreasing design-space axis mappings, via a new keyword-only allow_decreasing argument to models.normalizeValue (#3970, #4217, #4243).

• [designspaceLib] Allow partial DesignSpace v5 axis subsets: omitted range attributes on an <axis-subset> are taken from the parent axis, as the spec says (#4205).

• [designspaceLib] Fix DesignSpaceDocument.normalize() for mapped axes: axis bounds and rule conditions are now normalized from their original values (#4218).

• [designspaceLib] splitInterpolable and splitVariableFonts now warn when a source or instance is dropped because it lies outside the document’s own axes, instead of silently discarding it (#4244).

• [varLib.instancer] Add support for instancing variable COLRv1 fonts (#2699, #4279).

• [varLib.instancer] Apply VVAR vertical-origin deltas to VORG, and use OpenType rounding for instanced advances and vertical origins (#4221).

• [varLib.instancer] Keep a universal FeatureVariations record when pinning removes its last condition but other axes remain (#4247).

• [varLib.instancer] Preserve ppem Device corrections in GDEF, BASE, GPOS and JSTF instead of asserting on them (#4290).

• [varLib.instancer] Allow requesting an axis’s original range on VARC fonts (#4280).

• [varLib.instancer, subset] Fold, remove or remap MATH VariationIndex devices when instancing, subsetting the GDEF store or optimizing it (#4288).

• [varLib] Raise ValueError: Missing required table fvar from varLib.mutator and the instancer CLI on a static font, instead of a bare KeyError (#3751, #4300).

• [featureVars] When adding rvrn, also shift lookup indices inside existing FeatureVariations (#4233). Handle null ConditionSet and FeatureTableSubstitution offsets when building, subsetting and instancing (#4234, #4235). Keep FeatureTableSubstitution records sorted after merging new ones into an existing record (#4248).

• [ttLib] Fix FeatureParams (size, ssXX, cvXX) in FeatureVariations alternate feature tables, which failed to compile and round-trip (#3623, #4278).

• [ttLib] Fully decode lazily loaded ligatures, SinglePos and PairPos arrays during recursive decompilation, so reorderGlyphs() on a lazy font no longer corrupts or asserts on them (#4231, #4232).

• [VARC] Update the variation-store binary format to follow harfbuzz/boring-expansion-spec#175: SparseVarRegionList.RegionCount is uint32, sparse axes use Offset32 and MultiVarData items are stored in an INDEX. VARC fonts built with earlier fontTools versions must be rebuilt (#4219).

• [VARC] Several fixes: derive component conditions from conditionIndex (#4237), set the implicit scaleY when importing XML (#4238), report the font’s current coordinates for components that reset unspecified axes (#4239), and keep inherited coordinates when drawing CFF2 VARC components (#4236).

• [varLib] buildMultiVarData accepts flattened per-region vector tuples (#4245).

• [otConverters] Bounds-check CFF2 INDEX count and offSize on read, raising TTLibError instead of allocating huge lazy lists (#4220).

• [ttLib] Handle empty packed deltas when OPTIMIZE_FONT_SPEED is set (#4241).

• [scaleUpem] Scale per-glyph VORG origins (#4222); fix VARC scaling for static fonts and condition variations (#4223); don’t mutate the shared default CFF FontMatrix (#4251, #4252).

• [cmap] Fix format 2 compilation when all codes are single-byte (#1524, #4211) or all single-byte codes map to .notdef (#4215). Formats 2 and 4 now reject glyph IDs above 65535 instead of wrapping them (#4226). Split format 14 default UVS ranges longer than 256 codepoints (#4229). Empty format 12 and 13 subtables round-trip (#4246).

• [glyf] Use unsigned instruction lengths, so programs of 32768-65535 bytes compile and decompile correctly (#4227). Keep instructions in zero-contour glyphs (#4228).

• [pens] Fix cubic off-curve detection in TTGlyphPointPen across contour starts (#4224). Glyph.drawPoints() now raises NotImplementedError for an all-off-curve cubic contour, which the point pen protocol cannot express (#3191, #4225). RoundingPen passes the all-off-curve None sentinel through (#4311, #4312).

• [CFF2] Preserve operands when a blend has zero regions (#4240).

• [cffLib] Read CFF font names as Latin-1, matching how they are written (#4253). Deleting a CFF dict attribute now actually removes it (#2725, #4264).

• [CFF2ToCFF] Fix conversion of fonts with local subroutines (#4258). A CFF2 table with a single FontDict is now converted to a name-keyed CFF font that keeps its glyph names (#3890, #4265).

• [subset] Handle a null GDEF variation store (#4230).

• [merge] Support merging fonts that both have a MATH table (#3823, #4257).

• [feaLib] Reject the same mark class used twice in one anchor list (#3628, #4255). Don’t crash on value records whose devices are all NULL (#2396, #4261). Pad a short OS/2 Vendor with spaces (#4259).

• [feaLib] Raise FeatureLibError with a location, instead of a bare Python error, for: a BASE script list without a matching tag list (#4263), a UnicodeRange bit outside 0-127 (#4266), a name string that cannot be decoded (#4267), a STAT axis location with no or too many values (#4268), and a non-ASCII OS/2 Vendor (#4269).

• [name] Fix the BCP 47 tags of some Mac and Windows language IDs, e.g. es was mapped to Mac Estonian (#3733, #4256). getDebugName prefers the Windows English name over the Mac one (#3969, #4273).

• [post] Don’t crash on a format 2.0 table with numGlyphs set to 0 (#3060, #4274).

• [VDMX] Recompute numRecs and numRatios when compiling (#4293).

• [Silf] Fix compiling a Silf table that was decompiled from binary (#4294).

• [woff2] Preserve minorVersion when copying flavor data (#4249, #4250).

• [ttGlyphSet] Compute glyph width lazily for glyf variable fonts without HVAR, so .width is correct before drawing (#3964, #4260).

• [varLib.interpolatable] Respect designspace source layers (#3951, #4275); fix --json output with SciPy (#3870, #4276).

• [misc.psLib] Fix tokenizing of escaped parentheses in PostScript strings (#4207).

• [svgLib] Raise ValueError instead of IndexError on a truncated path command (#4254).

• [misc.transform] Preserve the direction of the remaining axis when decomposing a transform whose first column is zero (#4242).

• [misc.textTools] Tag.__ne__ returns NotImplemented for unsupported types (#4305, #4306).

• [misc.dictTools] hashdict rejects in-place union (|=) (#4313, #4314).

• [misc.xmlReader] Close owned input streams when parsing fails (#4298).

• [misc.filesystem] WriteZipFS.close() can be called more than once (#4309, #4310).

• [EBDT] Keep EBDT/CBDT glyph metrics after probing a missing attribute (#3806, #4216).

4.66.1 (released 2026-09-29)

• [designspaceLib] When splitting a DesignSpace v5 document with makeNames=True (as varLib.build_many does), family and style names set explicitly on an instance now take precedence over the ones computed from the STAT labels, in all languages, and a PostScript name is no longer made up from the labels for an instance that has its own style name (#3131, #4206, #4208).

• [cmap] Decompiling a format 4 subtable whose idRangeOffset points outside glyphIndexArray now raises TTLibError. A negative index used to silently map the code point to the wrong glyph, and one past the end raised a bare AssertionError (#4209).

• [cmap] Fix compiling a format 2 subtable when the lowest glyph ID in a lead-byte row is 32768 or higher, which failed with struct.error (#4210).

4.66.0 (released 2026-09-23)

• Drop support for EOL Python 3.10; fontTools now requires Python 3.11 or later. fontTools.misc.enumTools now only re-exports enum.StrEnum and is deprecated. Explicitly test and declare support for Python 3.15 (#4183, #4196).

• [unicodedata] Update the bundled script, script extension, block and bidi-mirroring tables to Unicode 18.0.0, and require unicodedata2 18.0.0 when it is used (#4192, #4197).

• [feaLib] Support language statements listing multiple language tags, e.g. language AZE CRT;, as Glyphs does and as proposed for the spec (adobe-type-tools/feature_file_workshops#8): the following rules and lookup references are registered under every listed language. dflt cannot be combined with other tags. LanguageStatement.language is still the first tag; all of them are in the new languages attribute (#4201, #4202).

• [feaLib] Fix lookups being dropped when a script/language pair is repeated within a feature block: the repeated statement replaced the language system’s lookups with a fresh copy of the default ones (#4189).

• [feaLib] Raise FeatureLibError instead of UnboundLocalError when a STAT table block lacks ElidedFallbackName or ElidedFallbackNameID (#3834, #4179).

• [cffLib] Always recompile the CFF2 VarStore when saving. Previously the bytes compiled by an earlier save were reused, so a CFF2 variable font that was saved and then modified in place, e.g. by the instancer, was written with a stale VarStore next to its updated charstrings (#4199).

• [ttLib] Support static VARC fonts that omit fvar while retaining gvar or CFF2 variation data for component-internal axes: hidden axes are addressed by index and gvar can compile, decompile and round-trip through TTX without fvar, reading the axis count from a new axisCount element (#4187, #4188).

• [ttLib] Fix drawing VARC components whose condition is negated (format 5), which raised AttributeError (#4191).

• [instancer] Fix VARC axis references left stale when removing an unrelated axis, reject pinning or restricting axes referenced by VARC components, and stop culling avar2 ranges for component-internal variations, which can reach outside the font-level ranges (#4190, #4193).

• [bezierTools] Preserve exact endpoints in splitQuadraticAtT and splitCubicAtTC as well, like splitCubicAtT since 4.55.4 (#3742, #4194).

• [bezierTools] Fix ZeroDivisionError in lineLineIntersections for collinear vertical lines; they are now treated as parallel like horizontal ones (#3515, #4181).

• [subset] pyftsubset now preserves the input font’s flavor (WOFF, WOFF2) when --flavor is omitted, instead of writing uncompressed sfnt data under the same extension; pass --flavor=none to force uncompressed output (#3630, #4182).

• [merge] Report incompatible unitsPerEm values by name, with the input values, instead of a bare assertion (#2844, #4184).

• [designspaceLib] Fix the type annotation and documentation of DesignSpaceDocument.default, which holds a SourceDescriptor, not a source name (#2994, #4186).

• [ttLib.sfnt] Raise TTLibError instead of AssertionError for inconsistent WOFF table, metadata and private-data lengths, so the checks also hold under python -O (#4178).

• [misc.etree] Disable entity resolution altogether on lxml >= 5.0 as well: lxml’s resolve_entities="internal" still fetched external parameter entities before lxml 6.1.3, so a crafted DTD could read local files into parsed XML content (#4195).

• [cmap] Bound the expansion of format 4 segments and format 12/13 groups when decompiling, like HarfBuzz does: groups are clamped to U+10FFFF, inverted or overlapping groups are skipped with a warning, and groups mapped to the missing glyph are not expanded. A crafted font could previously exhaust memory with a single group ending at 0xFFFFFFFF (#4204).

• [varLib.avar] Escape axis names and tags when varLib.avar.unbuild emits its designspace snippet, so a crafted font cannot inject markup (#4203).

4.65.0 (released 2026-09-10)

• [glyf] Add __iter__, items and values methods to the glyf table to make it more dict-like (#4156).

• [feaLib] Escape the anonymous block tag when scanning for its terminator, so tags containing regex metacharacters are matched literally (#4167).

• [varLib] Strip directory components from <variable-font name="..."/> when deriving the output filename in the varLib command line, so a designspace cannot write outside the output directory (#4168).

• [feaLib] Fix tracking of the current script and language across redundant script statements. Rules following a script statement that names the first declared language system no longer end up under the DFLT script, and a script statement naming the already-current script still narrows the language systems and terminates the current lookup while leaving the lookupflag alone, matching makeotf (#1824, #2522, #4169).

• [varLib.interpolatable] Escape glyph names in the HTML report (#4172).

• [otlLib] Fix overflow handling when building contextual lookups: offset overflows now raise OTLOffsetOverflowError instead of AttributeError so another contextual format can be tried (regression from #3439). When all formats overflow, split the ruleset in halves until it fits (#4171).

4.64.0 (released 2026-08-31)

• [feaLib] Fix name-table parsing for multibyte Mac encodings (#1196, #4092).

• [ttProgram] Also indent TrueType assembly following IDEF[ ], like function definitions (#4093).

• [subset] Keep East Asian spacing palt by default (#4094).

• [subset] Bug fix for MATH table in which constructions for glyphs that are only added during MATH closure were kept (#4096).

• [ufoLib] Make glyph-to-group construction accessible outside of lookup function (#4102).

• [glyf] Use reverse glyph map for O(1) __setitem__ membership (#4103).

• [ttLib] Fix fixLookupOverFlows() reporting success when it had not promoted any lookup to Extension, masking unresolvable overflows.

• [ttLib] Add support for TrueType Collection version 2 (#4100).

• [ttLib] Pin a single head.modified timestamp across TTCollection.save (#4111).

• [ttLib] Give an actionable error when LookupList overflow is unrecoverable (#4109).

• [ttLib] Add support for the AAT bitmap tables bhed, bdat, bloc, variants of head, EBDT, EBLC used in legacy Apple bitmap-only fonts (#4115).

• [ttLib] Check OS/2 fsSelection/macStyle consistency against bhed as well as head (#4118, #4119).

• [misc.roundTools] Add types and documentation (#4123).

• [varLib.instancer] Instance the BASE table (#4137).

• [varLib.instancer] Fix Private-dict vsindex handling in instantiateCFF2 (#4129, #4132).

• [varLib.instancer] Fix crash instancing CFF2 fonts without a VariationStore (#4130, #4131).

• [sfnt] Raise TTLibError instead of AssertionError or struct.error when reading a font truncated within the table directory or a table entry (#4147, #4149).

• [misc.xmlWriter] Escape the ]]> terminator inside CDATA sections, so an SVG document containing it can no longer smuggle markup past a TTX round trip (#4139).

• [varLib.instancer] Implement avar2 partial-instancing: the avar version 2 ItemVariationStore is adjusted so that remaining axes behave the same after limiting the designspace (#4045).

• [feaLib] Add shorthand for the value at the default location in a variable scalar: (100 wght=900:120) means (wght=400:100 wght=900:120) when the wght default is 400 (#4024).

• [cmap] Raise TTLibError for a truncated or out-of-bounds cmap subtable header (#4151).

• [designspaceLib] Reject conflicting duplicate inputs in axis maps instead of silently keeping the last one (#4153).

• [designspaceLib] Read an empty <lib> element as an empty lib instead of raising IndexError (#4142, #4144).

• [colorLib] Raise a legible error when a COLRv0 layer, or a COLRv1 PaintGlyph or PaintColrGlyph, references a glyph missing from the glyphMap, instead of failing obscurely later (#2629, #4141).

• [cmap] Don’t drop subtables in unsupported formats when compiling or dumping a font read from binary (#4136).

• [ttLib] Implement splitSinglePos so GPOS lookup type 1 offset overflows can be recovered by splitting the subtable (#4091, #4108).

• [cmap] Round-trip empty Macintosh format 2 subtables (#3663, #4117).

• [glyf] Raise TTLibError instead of RecursionError when recalcBounds() hits a composite-component reference cycle (#3899, #4116).

• [svgLib] Fix crash parsing an SVG path with consecutive closepath commands (Z Z) (#4122).

• [ttLib] Fix DefaultTable type annotations (#4126).

• [ttLib] Add support for the EBSC (Embedded Bitmap Scaling) table (#4113).

• [svgLib] Suppress spurious close segments caused by floating-point drift in relative path commands (#3860, #4127).

• [qu2cu] Fix TypeError in the Cython-compiled build when Qu2CuPen passes tuple splines (#4160).

• [mort] Add semantic decompilation, TTX, and compilation support for rearrangement, contextual-substitution, ligature, and insertion subtables (#4158, #4159, #4161).

• [svgLib] Start a new subpath at the just-closed subpath’s initial point when a drawto command follows a closepath, per SVG spec (#4154, #4155).

• [misc.filesystem] SECURITY Reject paths that resolve outside the filesystem root: a malicious UFO could read arbitrary files via .. components in contents.plist, and a crafted .ufoz could create files outside its temporary mirror (#4124).

• [ttLib] SECURITY Sanitise glyph names used as filenames in EBDT/CBDT ttx -z extfile export, preventing arbitrary file writes from untrusted fonts (#4128).

• [misc.etree] SECURITY Don’t resolve external XML entities in XMLParser when lxml is used, preventing XXE file disclosure on lxml < 5.0 (#4145).

• [subset] Fully prune VARC auxiliary data: collect and remap variation indices referenced by condition tables when subsetting the MultiVarStore, and drop the AxisIndicesList, ConditionList, and MultiVarStore when they end up empty (#4162).

4.63.0 (released 2026-05-14)

• [ttLib] Add support for Apple Color Emoji bgcl table (#4065).

• [ttLib] Add support for IFT and IFTX tables (Incremental Font Transfer, PatchMapFormat2) (#4070, #4072).

• [otData] Introduce FieldSpec dataclass for OpenType table schema definitions, replacing raw tuples in otData.py (#4076).

• [Feat] Show name table strings as comments next to label IDs in TTX output, matching the convention used by fvar, STAT, trak (#4089).

• [cu2qu] Fix Cython complex-division rounding difference in split_cubic_into_three that could cause ±1 off-curve coordinate shifts (#3928, #4083).

• [designspaceLib] Fix map_backward for many-to-one (flat-segment) axis maps that silently dropped entries via dict comprehension (googlefonts/ufo2ft#978, #4085).

• [OS/2] Fix setUnicodeRanges to accept reserved bits 123-127, restoring round-trip with getUnicodeRanges and fixing recalcUnicodeRanges crash in the subsetter (#4087, #4088).

• [cython] Declare Cython extensions as free-threading compatible on Python 3.13+, so that importing them on free-threaded Python no longer re-enables the GIL (#4073, #4090).

4.62.1 (released 2026-03-13)

• [feaLib] Extend contextual rule merging to all rule types: single subst, GSUB/GPOS named lookups, ignore rules, and chained alternate subst (#4061).

4.62.0 (released 2026-03-09)

• [diff] Add new fonttools diff command for comparing font files, imported from the fdiff project and heavily reworked (#1190, #4007, #4009, #4011, #4013, #4019).

• [feaLib] Fix VariableScalar interpolation bug with non-linear avar mappings. Also decouple VariableScalar from compiled fonts, allowing it to work with designspace data before compilation (#3938, #4054).

• [feaLib] Fix VariableScalar axis ordering and iterative delta rounding to match fontc behavior (#4053).

• [feaLib] Merge chained multi subst rules with same context into a single subtable instead of emitting one subtable per glyph (#4016, #4058).

• [feaLib] Pass location to ConditionsetStatement to fix glyphsLib round-tripping (fontra/fontra-glyphs#130, #4057).

• [feaLib] Write 0xFFFF instead of 0 for missing nameIDs in cv feature params (#4010, #4012).

• [cmap] Fix CmapSubtable.__lt__() TypeError on Python 3 when subtables share the same encoding record, and add compile-time validation for unique encoding records (#4035, #4055).

• [svgLib] Skip non-element XML nodes (comments, processing instructions) when drawing SVG paths (#4042, #4043).

• [glifLib] Fix regression reading glyph outlines when glyphObject=None (#4030, #4031).

• [pointPen] Fix SegmentToPointPen edge case: only remove a duplicate final point on closePath() if it is an on-curve point (#4014, #4015).

• [cffLib] SECURITY Replace eval() with safeEval() in parseBlendList() to prevent arbitrary code execution from crafted TTX files (#4039, #4040).

• [ttLib] Remove defunct Adobe SING Glyphlet tables (META, SING, GMAP, GPKG) (#4044).

• [varLib.interpolatable] Various bugfixes: fix swapped nodeTypes assignment, duplicate kink-detector condition, typos, CFF2 vsindex parsing, glyph existence check, and plot helpers (#4046).

• [varLib.models] Fix getSubModel not forwarding extrapolate/axisRanges; check location uniqueness after stripping zeros (#4047).

• [varLib] Fix --variable-fonts filter in build_many; remove dead code and fix comments (#4048).

• [avar] Preserve existing name table in build; keep unbuild return types consistent; validate map CLI coordinates (#4051).

• [cu2qu/qu2cu] Add input validation: reject non-positive tolerances, validate curve inputs and list lengths (#4052).

• [colorLib] Raise a clear ColorLibError when base glyphs are missing from glyphMap, instead of a confusing KeyError (#4041).

• [glyf] Remove unnecessary fvar table dependency (#4017).

• [fvar/trak] Remove unnecessary name table dependency (#4018).

• [ufoLib] Relax guideline validation to follow the updated spec (#3537, #3553).

• [ttFont] Fix saveXML regression with empty table lists, clarify docstring (#4025, #4026, #4056).

• [setup.py] Link libm for Cython extensions using math functions (#4028, #4029).

• Add typing annotations for DSIG, DefaultTable, ttProgram (#4033).

4.61.1 (released 2025-12-12)

• [otlLib] buildCoverage: return empty Coverage instead of None (#4003, #4004).

• [instancer] bug fix in avar2 full instancing (#4002).

• [designspaceLib] Preserve empty conditionsets when serializing to XML (#4001).

• [fontBu ilder] Fix FontBuilder setupOS2() default params globally polluted (#3996, #3997).

• [ttFont] Add more typing annotations to ttFont, xmlWriter, sfnt, varLib.models and others (#3952, #3826).

• Explicitly test and declare support for Python 3.14, even though we were already shipping pre-built wheels for it (#3990).

4.60.2 (released 2025-12-09)

• Backport release Same as 4.61.0 but without “Drop support for EOL Python 3.9” change to allow downstream projects still on Python 3.9 to avail of the security fix for CVE-2025-66034 (#3994, #3999).

4.61.0 (released 2025-11-28)

• [varLib.main]: SECURITY Only use basename(vf.filename) to prevent path traversal attacks when running fonttools varLib command, or code which invokes fonttools.varLib.main(). Fixes CVE-2025-66034, see: https://github.com/fonttools/fonttools/security/advisories/GHSA-768j-98cg-p3fv.

• [feaLib] Sort BaseLangSysRecords by tag (#3986).

• Drop support for EOL Python 3.9 (#3982).

• [instancer] Support –remove-overlaps for fonts with CFF2 table (#3975).

• [CFF2ToCFF] Add –remove-overlaps option (#3976).

• [feaLib] Raise an error for rsub with NULL target (#3979).

• [bezierTools] Fix logic bug in curveCurveIntersections (#3963).

• [feaLib] Error when condition sets have the same name (#3958).

• [cu2qu.ufo] skip processing empty glyphs to support sparse kerning masters (#3956).

• [unicodedata] Update to Unicode 17. Require unicodedata2 >= 17.0.0 when installed with ‘unicode’ extra.

4.60.1 (released 2025-09-29)

• [ufoLib] Reverted accidental method name change in UFOReader.getKerningGroupConversionRenameMaps that broke compatibility with downstream projects like defcon (#3948, #3947, robotools/defcon#478).

• [ufoLib] Added test coverage for getKerningGroupConversionRenameMaps method (#3950).

• [subset] Don’t try to subset BASE table; pass it through by default instead (#3949).

• [subset] Remove empty BaseRecord entries in MarkBasePos lookups (#3897, #3892).

• [subset] Add pruning for MarkLigPos and MarkMarkPos lookups (#3946).

• [subset] Remove duplicate features when subsetting (#3945).

• [Docs] Added documentation for the visitor module (#3944).

4.60.0 (released 2025-09-17)

• [pointPen] Allow reverseFlipped parameter of DecomposingPointPen to take a ReverseFlipped enum value to control whether/how to reverse contour direction of flipped components, in addition to the existing True/False. This allows to set ReverseFlipped.ON_CURVE_FIRST to ensure that the decomposed outline starts with an on-curve point before being reversed, for better consistency with other segment-oriented contour transformations. The change is backward compatible, and the default behavior hasn’t changed (#3934).

• [filterPen] Added ContourFilterPointPen, base pen for buffered contour operations, and OnCurveStartPointPen filter to ensure contours start with an on-curve point (#3934).

• [cu2qu] Fixed difference in cython vs pure-python complex division by real number (#3930).

• [varLib.avar] Refactored and added some new sub-modules and scripts (#3926). * varLib.avar.build module to build avar (and a missing fvar) binaries into a possibly empty TTFont, * varLib.avar.unbuild module to print a .designspace snippet that would generate the same avar binary, * varLib.avar.map module to take TTFont and do the mapping, in user/normalized space, * varLib.avar.plan module moved from varLib.avarPlanner. The bare fonttools varLib.avar script is deprecated, in favour of fonttools varLib.avar.build (or unbuild).

• [interpolatable] Clarify linear_sum_assignment backend options and minimal dependency usage (#3927).

• [post] Speed up build_psNameMapping (#3923).

• [ufoLib] Added typing annotations to fontTools.ufoLib (#3875).

4.59.2 (released 2025-08-27)

• [varLib] Clear USE_MY_METRICS component flags when inconsistent across masters (#3912).

• [varLib.instancer] Avoid negative advance width/height values when instatiating HVAR/VVAR, (unlikely in well-behaved fonts) (#3918).

• [subset] Fix shaping behaviour when pruning empty mark sets (#3915, harfbuzz/harfbuzz#5499).

• [cu2qu] Fixed dot() product of perpendicular vectors not always returning exactly 0.0 in all Python implementations (#3911)

• [varLib.instancer] Implemented fully-instantiating avar2 fonts (#3909).

• [feaLib] Allow float values in VariableScalar’s axis locations (#3906, #3907).

• [cu2qu] Handle special case in calc_intersect for degenerate cubic curves where 3 to 4 control points are equal (#3904).

4.59.1 (released 2025-08-14)

• [featureVars] Update OS/2.usMaxContext if possible after addFeatureVariationsRaw (#3894).

• [vhmtx] raise TTLibError(‘not enough data…’) when hmtx/vmtx are truncated (#3843, #3901).

• [feaLib] Combine duplicate features that have the same set of lookups regardless of the order in which those lookups are added to the feature (#3895).

• [varLib] Deprecate varLib.mutator in favor of varLib.instancer. The latter provides equivalent full (static font) instancing in addition to partial VF instancing. CLI users should replace fonttools varLib.mutator with fonttools varLib.instancer. API users should migrate to fontTools.varLib.instancer.instantiateVariableFont (#2680).

4.59.0 (released 2025-07-16)

• Removed hard-dependency on pyfilesystem2 (fs package) from fonttools[ufo] extra. This is replaced by the fontTools.misc.filesystem package, a stdlib-only, drop-in replacement for the subset of the pyfilesystem2’s API used by fontTools.ufoLib. The latter should continue to work with the upstream fs (we even test with/without). Clients who wish to continue using fs can do so by depending on it directly instead of via the fonttools[ufo] extra (#3885, #3620).

• [xmlWriter] Replace illegal XML characters (e.g. control or non-characters) with “?” when dumping to ttx (#3868, #71).

• [varLib.hvar] Fixed vertical metrics fields copy/pasta error (#3884).

• Micro optimizations in ttLib and sstruct modules (#3878, #3879).

• [unicodedata] Add Garay script to RTL_SCRIPTS (#3882).

• [roundingPen] Remove unreliable kwarg usage. Argument names aren’t consistent among point pens’ .addComponent() implementations, in particular baseGlyphName vs glyphName (#3880).

4.58.5 (released 2025-07-03)

• [feaLib] Don’t try to combine ligature & multisub rules (#3874).

• [feaLib/ast] Use weakref proxies to avoid cycles in visitor (#3873).

• [varLib.instancer] Fixed instancing CFF2 fonts where VarData contains more than 64k items (#3858).

4.58.4 (released 2025-06-13)

• [feaLib] Allow for empty MarkFilter & MarkAttach sets (#3856).

4.58.3 (released 2025-06-13)

• [feaLib] Fixed iterable check for Python 3.13.4 and newer (#3854, #3855).

4.58.2 (released 2025-06-06)

• [ttLib.reorderGlyphs] Handle CFF2 when reordering glyphs (#3852)

• [subset] Copy name IDs in use before scrapping or scrambling them for webfonts (#3853)

4.58.1 (released 2025-05-28)

• [varLib] Make sure that fvar named instances only reuse name ID 2 or 17 if they are at the default location across all axes, to match OT spec requirement (#3831).

• [feaLib] Improve single substitution promotion to multiple/ligature substitutions, fixing a few bugs as well (#3849).

• [loggingTools] Make Timer._time a static method that doesn’t take self, makes it easier to override (#3836).

• [featureVars] Use None for empty ConditionSet, which translates to a null offset in the compiled table (#3850).

• [feaLib] Raise an error on conflicting ligature substitution rules instead of silently taking the last one (#3835).

• Add typing annotations to T2CharStringPen (#3837).

• [feaLib] Add single substitutions that were promoted to multiple or ligature substitutions to aalt feature (#3847).

• [featureVars] Create a default LangSys in a ScriptRecord if missing when adding feature variations to existing GSUB later in the build (#3838).

• [symfont] Added a main().

• [cffLib.specializer] Fix rmoveto merging when blends used (#3839, #3840).

• [pyftmerge] Add support for cmap format 14 in the merge tool (#3830).

• [varLib.instancer/cff2] Fix vsindex of Private dicts when instantiating (#3828, #3232).

• Update text file read to use UTF-8 with optional BOM so it works with e.g. Windows Notepad.exe (#3824).

• [varLib] Ensure that instances only reuse name ID 2 or 17 if they are at the default location across all axes (#3831).

• [varLib] Create a dflt LangSys in a ScriptRecord when adding variations later, to fix an avoidable crash in an edge case (#3838).

4.58.0 (released 2025-05-10)

• Drop Python 3.8, require 3.9+ (#3819)

• [HVAR, VVAR] Prune unused regions when using a direct mapping (#3797)

• [Docs] Improvements to ufoLib documentation (#3721)

• [Docs] Improvements to varLib documentation (#3727)

• [Docs] Improvements to Pens and pen-module documentation (#3724)

• [Docs] Miscellany updates to docs (misc modules and smaller modules) (#3730)

• [subset] Close codepoints over BiDi mirror variants. (#3801)

• [feaLib] Fix serializing ChainContextPosStatement and ChainContextSubstStatement in some rare cases (#3788)

• [designspaceLib] Clarify user expectations for getStatNames (#2892)

• [GVAR] Add support for new GVAR table (#3728)

• [TSI0, TSI5] Derive number of entries to decompile from data length (#2477)

• [ttLib] Fix AttributeError when reporting table overflow (#3808)

• [ttLib] Apply rounding more often in getCoordinates (#3798)

• [ttLib] Ignore component bounds if empty (#3799)

• [ttLib] Change the separator for duplicate glyph names from “#” to “.” (#3809)

• [feaLib] Support subtable breaks in CursivePos, MarkBasePos, MarkToLigPos and MarkToMarkPos lookups (#3800, #3807)

• [feaLib] If the same lookup has single substitutions and ligature substitutions, upgrade single substitutions to ligature substitutions with one input glyph (#3805)

• [feaLib] Correctly handle <NULL> in single pos lookups (#3803)

• [feaLib] Remove duplicates from class pair pos classes instead of raising an error (#3804)

• [feaLib] Support creating extension lookups using useExtenion lookup flag instead of silently ignoring it (#3811)

• [STAT] Add typing for the simpler STAT arguments (#3812)

• [otlLib.builder] Add future import for annotations (#3814)

• [cffLib] Fix reading supplement encoding (#3813)

• [voltLib] Add some missing functionality and fixes to voltLib and VoltToFea, making the conversion to feature files more robust. Add also fonttools voltLib command line tool to compile VOLT sources directly (doing an intermediate fea conversion internally) (#3818)

• [pens] Add some PointPen annotations (#3820)

4.57.0 (released 2025-04-03)

• [ttLib.__main__] Add –no-recalc-timestamp flag (#3771)

• [ttLib.__main__] Add -b (recalcBBoxes=False) flag (#3772)

• [cmap] Speed up glyphOrder loading from cmap (#3774)

• [ttLib.__main__] Improvements around the -t flag (#3776)

• [Debg] Fix parsing from XML; add roundtrip tests (#3781)

• [fealib] Support *Base.MinMax tables (#3783, #3786)

• [config] Add OPTIMIZE_FONT_SPEED (#3784)

• [varLib.hvar] New module to add HVAR table to the font (#3780)

• [otlLib.optimize] Fix crash when the provided TTF does not contain a GPOS (#3794)

4.56.0 (released 2025-02-07)

• [varStore] Sort the input todo list with the same sorting key used for the opimizer’s output (#3767).

• [otData] Fix DeviceTable’s DeltaValue repeat value which caused a crash after importing from XML and then compiling a GPOS containing Device tables (#3758).

• [feaLib] Make FeatureLibError pickleable, so client can e.g. use feaLib to can compile features in parallel with multiprocessing (#3762).

• [varLib/gvar] Removed workaround for old, long-fixed macOS bug about composite glyphs with all zero deltas (#1381, #1788).

• [Docs] Updated ttLib documentation, beefed up TTFont and TTGlyphSet explanations (#3720).

4.55.8 (released 2025-01-29)

• [MetaTools] Fixed bug in buildUCD.py script whereby the first non-header line of some UCD text file was being skipped. This affected in particular the U+00B7 (MIDDLE DOT) entry of ScriptExtensions.txt (#3756).

4.55.7 (released 2025-01-28)

• Shorten the changelog included in PyPI package description to accommodate maximum length limit imposed by Azure DevOps. No actual code changes since v4.55.6 (#3754).

4.55.6 (released 2025-01-24)

• [glyf] Fixed regression introduced in 4.55.5 when computing bounds of nested composite glyphs with transformed components (#3752).

4.55.5 (released 2025-01-23)

• [glyf] Fixed recalcBounds of transformed components with unrounded coordinates (#3750).

• [feaLib] Allow duplicate script/language statements (#3749).

4.55.4 (released 2025-01-21)

• [bezierTools] Fixed splitCubicAtT sometimes not returning identical start/end points as result of numerical precision (#3742, #3743).

• [feaLib/ast] Fixed docstring of AlternateSubstStatement (#3735).

• [transform] Typing fixes (#3734).

4.55.3 (released 2024-12-10)

• [Docs] fill out ttLib table section [#3716]

• [feaLib] More efficient inline format 4 lookups [#3726]

4.55.2 (released 2024-12-05)

• [Docs] update Sphinx config (#3712)

• [designspaceLib] Allow axisOrdering to be set to zero (#3715)

• [feaLib] Don’t modify variable anchors in place (#3717)

4.55.1 (released 2024-12-02)

• [ttGlyphSet] Support VARC CFF2 fonts (#3683)

• [DecomposedTransform] Document and implement always skewY == 0 (#3697)

• [varLib] “Fix” cython iup issue? (#3704)

• Cython minor refactor (#3705)

4.55.0 (released 2024-11-14)

• [cffLib.specializer] Adjust stack use calculation (#3689)

• [varLib] Lets not add mac names if the rest of name doesn’t have them (#3688)

• [ttLib.reorderGlyphs] Update CFF table charstrings and charset (#3682)

• [cffLib.specializer] Add cmdline to specialize a CFF2 font (#3675, #3679)

• [CFF2] Lift uint16 VariationStore.length limitation (#3674)

• [subset] consider variation selectors subsetting cmap14 (#3672)

• [varLib.interpolatable] Support CFF2 fonts (#3670)

• Set isfinal to true in XML parser for proper resource cleanup (#3669)

• [removeOverlaps] Fix CFF CharString width (#3659)

• [glyf] Add optimizeSize option (#3657)

• Python 3.13 support (#3656)

• [TupleVariation] Optimize for loading speed, not size (#3650, #3653)

4.54.1 (released 2024-09-24)

• [unicodedata] Update to Unicode 16

• [subset] Escape \\ in doc string

4.54.0 (released 2024-09-23)

• [Docs] Small docs cleanups by @n8willis (#3611)

• [Docs] cleanup code blocks by @n8willis (#3627)

• [Docs] fix Sphinx builds by @n8willis (#3625)

• [merge] Minor fixes to documentation for merge by @drj11 (#3588)

• [subset] Small tweaks to pyftsubset documentation by @RoelN (#3633)

• [Tests] Do not require fonttools command to be available by @behdad (#3612)

• [Tests] subset_test: add failing test to reproduce issue #3616 by @anthrotype (#3622)

• [ttLib] NameRecordVisitor: include whole sequence of character variants’ UI labels, not just the first by @anthrotype (#3617)

• [varLib.avar] Reconstruct mappings from binary by @behdad (#3598)

• [varLib.instancer] Fix visual artefacts with partial L2 instancing by @Hoolean (#3635)

• [varLib.interpolatable] Support discrete axes in .designspace by @behdad (#3599)

• [varLib.models] By default, assume OpenType-like normalized space by @behdad (#3601)

4.53.1 (released 2024-07-05)

• [feaLib] Improve the sharing of inline chained lookups (#3559)

• [otlLib] Correct the calculation of OS/2.usMaxContext with reversed chaining contextual single substitutions (#3569)

• [misc.visitor] Visitors search the inheritance chain of objects they are visiting (#3581)

4.53.0 (released 2024-05-31)

• [ttLib.removeOverlaps] Support CFF table to aid in downconverting CFF2 fonts (#3528)

• [avar] Fix crash when accessing not-yet-existing attribute (#3550)

• [docs] Add buildMathTable to otlLib.builder documentation (#3540)

• [feaLib] Allow UTF-8 with BOM when reading features (#3495)

• [SVGPathPen] Revert rounding coordinates to two decimal places by default (#3543)

• [varLib.instancer] Refix output filename decision-making (#3545, #3544, #3548)

4.52.4 (released 2024-05-27)

• [varLib.cff] Restore and deprecate convertCFFtoCFF2 that was removed in 4.52.0 release as it is used by downstream projects (#3535).

4.52.3 (released 2024-05-27)

• Fixed a small syntax error in the reStructuredText-formatted NEWS.rst file which caused the upload to PyPI to fail for 4.52.2. No other code changes.

4.52.2 (released 2024-05-27)

• [varLib.interpolatable] Ensure that scipy/numpy output is JSON-serializable (#3522, #3526).

• [housekeeping] Regenerate table lists, to fix pyinstaller packaging of the new VARC table (#3531, #3529).

• [cffLib] Make CFFToCFF2 and CFF2ToCFF more robust (#3521, #3525).

4.52.1 (released 2024-05-24)

• Fixed a small syntax error in the reStructuredText-formatted NEWS.rst file which caused the upload to PyPI to fail for 4.52.0. No other code changes.

4.52.0 (released 2024-05-24)

• Added support for the new VARC (Variable Composite) table that is being proposed to OpenType spec (#3395). For more info: https://github.com/harfbuzz/boring-expansion-spec/blob/main/VARC.md

• [ttLib.__main__] Fixed decompiling all tables (90fed08).

• [feaLib] Don’t reference the same lookup index multiple times within the same feature record, it is only applied once anyway (#3520).

• [cffLib] Moved methods to desubroutinize, remove hints and unused subroutines from subset module to cffLib (#3517).

• [varLib.instancer] Added support for partial-instancing CFF2 tables! Also, added method to down-convert from CFF2 to CFF 1.0, and CLI entry points to convert CFF<->CFF2 (#3506).

• [subset] Prune unused user name IDs even with –name-IDs=’*’ (#3410).

• [ttx] use GNU-style getopt to intermix options and positional arguments (#3509).

• [feaLib.variableScalar] Fixed value_at_location() method (#3491)

• [psCharStrings] Shorten output of encodeFloat (#3492).

• [bezierTools] Fix infinite-recursion in calcCubicArcLength (#3502).

• [avar2] Implement avar2 support in TTFont.getGlyphSet() (#3473).

4.51.0 (released 2024-04-05)

• [ttLib] Optimization on loading aux fields (#3464).

• [ttFont] Add reorderGlyphs (#3468).

4.50.0 (released 2024-03-15)

• [pens] Added decomposing filter pens that draw components as regular contours (#3460).

• [instancer] Drop explicit no-op axes from TupleVariations (#3457).

• [cu2qu/ufo] Return set of modified glyph names from fonts_to_quadratic (#3456).

4.49.0 (released 2024-02-15)

• [otlLib] Add API for building MATH table (#3446)

4.48.1 (released 2024-02-06)

• Fixed uploading wheels to PyPI, no code changes since v4.48.0.

4.48.0 (released 2024-02-06)

• [varLib] Do not log when there are no OTL tables to be merged.

• [setup.py] Do not restrict lxml<5 any more, tests pass just fine with lxml>=5.

• [feaLib] Remove glyph and class names length restrictions in FEA (#3424).

• [roundingPens] Added transformRoundFunc parameter to the rounding pens to allow for custom rounding of the components’ transforms (#3426).

• [feaLib] Keep declaration order of ligature components within a ligature set, instead of sorting by glyph name (#3429).

• [feaLib] Fixed ordering of alternates in aalt lookups, following the declaration order of feature references within the aalt feature block (#3430).

• [varLib.instancer] Fixed a bug in the instancer’s IUP optimization (#3432).

• [sbix] Support sbix glyphs with new graphicType “flip” (#3433).

• [svgPathPen] Added --glyphs option to dump the SVG paths for the named glyphs in the font (0572f78).

• [designspaceLib] Added “description” attribute to <mappings> and <mapping> elements, and allow multiple <mappings> elements to group <mapping> elements that are logically related (#3435, #3437).

• [otlLib] Correctly choose the most compact GSUB contextual lookup format (#3439).

4.47.2 (released 2024-01-11)

Minor release to fix uploading wheels to PyPI.

4.47.1 (released 2024-01-11)

• [merge] Improve help message and add standard command line options (#3408)

• [otlLib] Pass ttFont to name.addName in buildStatTable (#3406)

• [featureVars] Re-use FeatureVariationRecord’s when possible (#3413)

4.47.0 (released 2023-12-18)

• [varLib.models] New API for VariationModel: getMasterScalars and interpolateFromValuesAndScalars.

• [varLib.interpolatable] Various bugfixes and rendering improvements. In particular, add a Summary page in the front, and an Index and Table-of-Contents in the back. Change the page size to Letter.

• [Docs/designspaceLib] Defined a new public.fontInfo lib key, not used anywhere yet (#3358).

4.46.0 (released 2023-12-02)

• [featureVars] Allow to register the same set of substitution rules to multiple features. The addFeatureVariations function can now take a list of featureTags; similarly, the lib key ‘com.github.fonttools.varLib.featureVarsFeatureTag’ can now take a comma-separateed string of feature tags (e.g. “salt,ss01”) instead of a single tag (#3360).

• [featureVars] Don’t overwrite GSUB FeatureVariations, but append new records to it for features which are not already there. But raise VarLibError if the feature tag already has feature variations associated with it (#3363).

• [varLib] Added addGSUBFeatureVariations function to add GSUB Feature Variations to an existing variable font from rules defined in a DesignSpace document (#3362).

• [varLib.interpolatable] Various bugfixes and rendering improvements. In particular, a new test for “underweight” glyphs. The new test reports quite a few false-positives though. Please send feedback.

4.45.1 (released 2023-11-23)

• [varLib.interpolatable] Various bugfixes and improvements, better reporting, reduced false positives.

• [ttGlyphSet] Added option to not recalculate glyf bounds (#3348).

4.45.0 (released 2023-11-20)

• [varLib.interpolatable] Vastly improved algorithms. Also available now is --pdf and --html options to generate a PDF or HTML report of the interpolation issues. The PDF/HTML report showcases the problematic masters, the interpolated broken glyph, as well as the proposed fixed version.

4.44.3 (released 2023-11-15)

• [subset] Only prune codepage ranges for OS/2.version >= 1, ignore otherwise (#3334).

• [instancer] Ensure hhea vertical metrics stay in sync with OS/2 ones after instancing MVAR table containing ‘hasc’, ‘hdsc’ or ‘hlgp’ tags (#3297).

4.44.2 (released 2023-11-14)

• [glyf] Have Glyph.recalcBounds skip empty components (base glyph with no contours) when computing the bounding box of composite glyphs. This simply restores the existing behavior before some changes were introduced in fonttools 4.44.0 (#3333).

4.44.1 (released 2023-11-14)

• [feaLib] Ensure variable mark anchors are deep-copied while building since they get modified in-place and later reused (#3330).

• [OS/2|subset] Added method to recalcCodePageRanges to OS/2 table class; added --prune-codepage-ranges to fonttools subset command (#3328, #2607).

4.44.0 (released 2023-11-03)

• [instancer] Recalc OS/2 AvgCharWidth after instancing if default changes (#3317).

• [otlLib] Make ClassDefBuilder class order match varLib.merger’s, i.e. large classes first, then glyph lexicographic order (#3321, #3324).

• [instancer] Allow not specifying any of min:default:max values and let be filled up with fvar’s values (#3322, #3323).

• [instancer] When running –update-name-table ignore axes that have no STAT axis values (#3318, #3319).

• [Debg] When dumping to ttx, write the embedded JSON as multi-line string with indentation (92cbfee0d).

• [varStore] Handle > 65535 items per encoding by splitting VarData subtable (#3310).

• [subset] Handle null-offsets in MarkLigPos subtables.

• [subset] Keep East Asian spacing fatures vhal, halt, chws, vchw by default (#3305).

• [instancer.solver] Fixed case where axisDef < lower and upper < axisMax (#3304).

• [glyf] Speed up compilation, mostly around recalcBounds (#3301).

• [varLib.interpolatable] Speed it up when working on variable fonts, plus various micro-optimizations (#3300).

• Require unicodedata2 >= 15.1.0 when installed with ‘unicode’ extra, contains UCD 15.1.

4.43.1 (released 2023-10-06)

• [EBDT] Fixed TypeError exception in _reverseBytes method triggered when dumping some bitmap fonts with ttx -z bitwise option (#3162).

• [v/hhea] Fixed UnboundLocalError exception in recalc method when no vmtx or hmtx tables are present (#3290).

• [bezierTools] Fixed incorrectly typed cython local variable leading to TypeError when calling calcQuadraticArcLength (#3288).

• [feaLib/otlLib] Better error message when building Coverage table with missing glyph (#3286).

4.43.0 (released 2023-09-29)

• [subset] Set up lxml XMLParser(resolve_entities=False) when parsing OT-SVG documents to prevent XML External Entity (XXE) attacks (9f61271dc): https://codeql.github.com/codeql-query-help/python/py-xxe/

• [varLib.iup] Added workaround for a Cython bug in iup_delta_optimize that was leading to IUP tolerance being incorrectly initialised, resulting in sub-optimal deltas (60126435d, cython/cython#5732).

• [varLib] Added new command-line entry point fonttools varLib.avar to add an avar table to an existing VF from axes mappings in a .designspace file (0a3360e52).

• [instancer] Fixed bug whereby no longer used variation regions were not correctly pruned after VarData optimization (#3268).

• Added support for Python 3.12 (#3283).

4.42.1 (released 2023-08-20)

• [t1Lib] Fixed several Type 1 issues (#3238, #3240).

• [otBase/packer] Allow sharing tables reached by different offset sizes (#3241, #3236).

• [varLib/merger] Fix Cursive attachment merging error when all anchors are NULL (#3248, #3247).

• [ttLib] Fixed warning when calling addMultilingualName and ttFont parameter was not passed on to findMultilingualName (#3253).

4.42.0 (released 2023-08-02)

• [varLib] Use sentinel value 0xFFFF to mark a glyph advance in hmtx/vmtx as non participating, allowing sparse masters to contain glyphs for variation purposes other than {H,V}VAR (#3235).

• [varLib/cff] Treat empty glyphs in non-default masters as missing, thus not participating in CFF2 delta computation, similarly to how varLib already treats them for gvar (#3234).

• Added varLib.avarPlanner script to deduce ‘correct’ avar v1 axis mappings based on glyph average weights (#3223).

4.41.1 (released 2023-07-21)

• [subset] Fixed perf regression in v4.41.0 by making NameRecordVisitor only visit tables that do contain nameID references (#3213, #3214).

• [varLib.instancer] Support instancing fonts containing null ConditionSet offsets in FeatureVariationRecords (#3211, #3212).

• [statisticsPen] Report font glyph-average weight/width and font-wide slant.

• [fontBuilder] Fixed head.created date incorrectly set to 0 instead of the current timestamp, regression introduced in v4.40.0 (#3210).

• [varLib.merger] Support sparse CursivePos masters (#3209).

4.41.0 (released 2023-07-12)

• [fontBuilder] Fixed bug in setupOS2 with default panose attribute incorrectly being set to a dict instead of a Panose object (#3201).

• [name] Added method to removeUnusedNameRecords in the user range (#3185).

• [varLib.instancer] Fixed issue with L4 instancing (moving default) (#3179).

• [cffLib] Use latin1 so we can roundtrip non-ASCII in {Full,Font,Family}Name (#3202).

• [designspaceLib] Mark <source name=”…”> as optional in docs (as it is in the code).

• [glyf-1] Fixed drawPoints() bug whereby last cubic segment becomes quadratic (#3189, #3190).

• [fontBuilder] Propagate the ‘hidden’ flag to the fvar Axis instance (#3184).

• [fontBuilder] Update setupAvar() to also support avar 2, fixing _add_avar() call site (#3183).

• Added new voltLib.voltToFea submodule (originally Tiro Typeworks’ “Volto”) for converting VOLT OpenType Layout sources to FEA format (#3164).

4.40.0 (released 2023-06-12)

• Published native binary wheels to PyPI for all the python minor versions and platform and architectures currently supported that would benefit from this. They will include precompiled Cython-accelerated modules (e.g. cu2qu) without requiring to compile them from source. The pure-python wheel and source distribution will continue to be published as always (pip will automatically chose them when no binary wheel is available for the given platform, e.g. pypy). Use pip install --no-binary=fonttools fonttools to expliclity request pip to install from the pure-python source.

• [designspaceLib|varLib] Add initial support for specifying axis mappings and build avar2 table from those (#3123).

• [feaLib] Support variable ligature caret position (#3130).

• [varLib|glyf] Added option to –drop-implied-oncurves; test for impliable oncurve points either before or after rounding (#3146, #3147, #3155, #3156).

• [TTGlyphPointPen] Don’t error with empty contours, simply ignore them (#3145).

• [sfnt] Fixed str vs bytes remnant of py3 transition in code dealing with de/compiling WOFF metadata (#3129).

• [instancer-solver] Fixed bug when moving default instance with sparse masters (#3139, #3140).

• [feaLib] Simplify variable scalars that don’t vary (#3132).

• [pens] Added filter pen that explicitly emits closing line when lastPt != movePt (#3100).

• [varStore] Improve optimize algorithm and better document the algorithm (#3124, #3127). Added quantization option (#3126).

• Added CI workflow config file for building native binary wheels (#3121).

• [fontBuilder] Added glyphDataFormat=0 option; raise error when glyphs contain cubic outlines but glyphDataFormat was not explicitly set to 1 (#3113, #3119).

• [subset] Prune emptied GDEF.MarkGlyphSetsDef and remap indices; ensure GDEF is subsetted before GSUB and GPOS (#3114, #3118).

• [xmlReader] Fixed issue whereby DSIG table data was incorrectly parsed (#3115, #2614).

• [varLib/merger] Fixed merging of SinglePos with pos=0 (#3111, #3112).

• [feaLib] Demote “Feature has not been defined” error to a warning when building aalt and referenced feature is empty (#3110).

• [feaLib] Dedupe multiple substitutions with classes (#3105).

4.39.4 (released 2023-05-10)

• [varLib.interpolatable] Allow for sparse masters (#3075)

• [merge] Handle differing default/nominalWidthX in CFF (#3070)

• [ttLib] Add missing main.py file to ttLib package (#3088)

• [ttx] Fix missing composite instructions in XML (#3092)

• [ttx] Fix split tables option to work on filenames containing ‘%’ (#3096)

• [featureVars] Process lookups for features other than rvrn last (#3099)

• [feaLib] support multiple substitution with classes (#3103)

4.39.3 (released 2023-03-28)

• [sbix] Fixed TypeError when compiling empty glyphs whose imageData is None, regression was introduced in v4.39 (#3059).

• [ttFont] Fixed AttributeError on python <= 3.10 when opening a TTFont from a tempfile SpooledTemporaryFile, seekable method only added on python 3.11 (#3052).

4.39.2 (released 2023-03-16)

• [varLib] Fixed regression introduced in 4.39.1 whereby an incomplete ‘STAT’ table would be built even though a DesignSpace v5 did contain ‘STAT’ definitions (#3045, #3046).

4.39.1 (released 2023-03-16)

• [avar2] Added experimental support for reading/writing avar version 2 as specified in this draft proposal: https://github.com/harfbuzz/boring-expansion-spec/blob/main/avar2.md

• [glifLib] Wrap underlying XML library exceptions with GlifLibError when parsing GLIFs, and also print the name and path of the glyph that fails to be parsed (#3042).

• [feaLib] Consult avar for normalizing user-space values in ConditionSets and in VariableScalars (#3042, #3043).

• [ttProgram] Handle string input to Program.fromAssembly() (#3038).

• [otlLib] Added a config option to emit GPOS 7 lookups, currently disabled by default because of a macOS bug (#3034).

• [COLRv1] Added method to automatically compute ClipBoxes (#3027).

• [ttFont] Fixed getGlyphID to raise KeyError on missing glyphs instead of returning None. The regression was introduced in v4.27.0 (#3032).

• [sbix] Fixed UnboundLocalError: cannot access local variable ‘rawdata’ (#3031).

• [varLib] When building VF, do not overwrite a pre-existing STAT table that was built with feaLib from FEA feature file. Also, added support for building multiple VFs defined in Designspace v5 from fonttools varLib script (#3024).

• [mtiLib] Only add Debg table with lookup names when FONTTOOLS_LOOKUP_DEBUGGING env variable is set (#3023).

4.39.0 (released 2023-03-06)

• [mtiLib] Optionally add Debg debug info for MTI feature builds (#3018).

• [ttx] Support reading input file from standard input using special - character, similar to existing -o - option to write output to standard output (#3020).

• [cython] Prevent cython.compiled raise AttributeError if cython not installed properly (#3017).

• [OS/2] Guard against ZeroDivisionError when calculating xAvgCharWidth in the unlikely scenario no glyph has non-zero advance (#3015).

• [subset] Recompute xAvgCharWidth independently of –no-prune-unicode-ranges, previously the two options were involuntarily bundled together (#3012).

• [fontBuilder] Add debug parameter to addOpenTypeFeatures method to add source debugging information to the font in the Debg private table (#3008).

• [name] Make NameRecord __lt__ comparison not fail on Unicode encoding errors (#3006).

• [featureVars] Fixed bug in overlayBox (#3003, #3005).

• [glyf] Added experimental support for cubic bezier curves in TrueType glyf table, as outlined in glyf v1 proposal (#2988): https://github.com/harfbuzz/boring-expansion-spec/blob/main/glyf1-cubicOutlines.md

• Added new qu2cu module and related qu2cuPen, the reverse of cu2qu for converting TrueType quadratic splines to cubic bezier curves (#2993).

• [glyf] Added experimental support for reading and writing Variable Composites/Components as defined in glyf v1 spec proposal (#2958): https://github.com/harfbuzz/boring-expansion-spec/blob/main/glyf1-varComposites.md.

• [pens]: Added addVarComponent method to pen protocols’ base classes, which pens can implement to handle varcomponents (by default they get decomposed) (#2958).

• [misc.transform] Added DecomposedTransform class which implements an affine transformation with separate translate, rotation, scale, skew, and transformation-center components (#2598)

• [sbix] Ensure Glyph.referenceGlyphName is set; fixes error after dumping and re-compiling sbix table with ‘dupe’ glyphs (#2984).

• [feaLib] Be cleverer when merging chained single substitutions into same lookup when they are specified using the inline notation (#2150, #2974).

• [instancer] Clamp user-inputted axis ranges to those of fvar (#2959).

• [otBase/subset] Define __getstate__ for BaseTable so that a copied/pickled ‘lazy’ object gets its own OTTableReader to read from; incidentally fixes a bug while subsetting COLRv1 table containing ClipBoxes on python 3.11 (#2965, #2968).

• [sbix] Handle glyphs with “dupe” graphic type on compile correctly (#2963).

• [glyf] endPointsOfContours field should be unsigned! Kudos to behdad for spotting one of the oldest bugs in FT. Probably nobody has ever dared to make glyphs with more than 32767 points… (#2957).

• [feaLib] Fixed handling of ignore statements with unmarked glyphs to match makeotf behavior, which assumes the first glyph is marked (#2950).

• Reformatted code with black and enforce new code style via CI check (#2925).

• [feaLib] Sort name table entries following OT spec prescribed order in the builder (#2927).

• [cu2quPen] Add Cu2QuMultiPen that converts multiple outlines at a time in interpolation compatible way; its methods take a list of tuples arguments that would normally be passed to individual segment pens, and at the end it dispatches the converted outlines to each pen (#2912).

• [reverseContourPen/ttGlyphPen] Add outputImpliedClosingLine option (#2913, #2914, #2921, #2922, #2995).

• [gvar] Avoid expanding all glyphs unnecessarily upon compile (#2918).

• [scaleUpem] Fixed bug whereby CFF2 vsindex was scaled; it should not (#2893, #2894).

• [designspaceLib] Add DS.getAxisByTag and refactor getAxis (#2891).

• [unicodedata] map Zmth<->math in ot_tag_{to,from}_script (#1737, #2889).

• [woff2] Support encoding/decoding OVERLAP_SIMPLE glyf flags (#2576, #2884).

• [instancer] Update OS/2 class and post.italicAngle when default moved (L4)

• Dropped support for Python 3.7 which reached EOL, fontTools requires 3.8+.

• [instancer] Fixed instantiateFeatureVariations logic when a rule range becomes default-applicable (#2737, #2880).

• [ttLib] Add main to ttFont and ttCollection that just decompile and re-compile the input font (#2869).

• [featureVars] Insert ‘rvrn’ lookup at the beginning of LookupList, to work around bug in Apple implementation of ‘rvrn’ feature which the spec says it should be processed early whereas on macOS 10.15 it follows lookup order (#2140, #2867).

• [instancer/mutator] Remove ‘DSIG’ table if present.

• [svgPathPen] Don’t close path in endPath(), assume open unless closePath() (#2089, #2865).

4.38.0 (released 2022-10-21)

• [varLib.instancer] Added support for L4 instancing, i.e. moving the default value of an axis while keeping it variable. Thanks Behdad! (#2728, #2861). It’s now also possible to restrict an axis min/max values beyond the current default value, e.g. a font wght has min=100, def=400, max=900 and you want a partial VF that only varies between 500 and 700, you can now do that. You can either specify two min/max values (wght=500:700), and the new default will be set to either the minimum or maximum, depending on which one is closer to the current default (e.g. 500 in this case). Or you can specify three values (e.g. wght=500:600:700) to specify the new default value explicitly.

• [otlLib/featureVars] Set a few Count values so one doesn’t need to compile the font to update them (#2860).

• [varLib.models] Make extrapolation work for 2-master models as well where one master is at the default location (#2843, #2846). Add optional extrapolate=False to normalizeLocation() (#2847, #2849).

• [varLib.cff] Fixed sub-optimal packing of CFF2 deltas by no longer rounding them to integer (#2838).

• [scaleUpem] Calculate numShorts in VarData after scale; handle CFF hintmasks (#2840).

4.37.4 (released 2022-09-30)

• [subset] Keep nameIDs used by CPAL palette entry labels (#2837).

• [varLib] Avoid negative hmtx values when creating font from variable CFF2 font (#2827).

• [instancer] Don’t prune stat.ElidedFallbackNameID (#2828).

• [unicodedata] Update Scripts/Blocks to Unicode 15.0 (#2833).

4.37.3 (released 2022-09-20)

• Fix arguments in calls to (glyf) glyph.draw() and drawPoints(), whereby offset wasn’t correctly passed down; this fix also exposed a second bug, where lsb and tsb were not set (#2824, #2825, adobe-type-tools/afdko#1560).

4.37.2 (released 2022-09-15)

• [subset] Keep CPAL table and don’t attempt to prune unused color indices if OT-SVG table is present even if COLR table was subsetted away; OT-SVG may be referencing the CPAL table; for now we assume that’s the case (#2814, #2815).

• [varLib.instancer] Downgrade GPOS/GSUB version if there are no more FeatureVariations after instancing (#2812).

• [subset] Added --no-lazy to optionally load fonts eagerly (mostly to ease debugging of table lazy loading, no practical effects) (#2807).

• [varLib] Avoid building empty COLR.DeltaSetIndexMap with only identity mappings (#2803).

• [feaLib] Allow multiple value record types (by promoting to the most general format) within the same PairPos subtable; e.g. this allows variable and non variable kerning rules to share the same subtable. This also fixes a bug whereby some kerning pairs would become unreachable while shapiong because of premature subtable splitting (#2772, #2776).

• [feaLib] Speed up VarScalar by caching models for recurring master locations (#2798).

• [feaLib] Optionally cythonize feaLib.lexer, speeds up parsing FEA a bit (#2799).

• [designspaceLib] Avoid crash when handling unbounded rule conditions (#2797).

• [post] Don’t crash if post legacy format 1 is malformed/improperly used (#2786)

• [gvar] Don’t be “lazy” (load all glyph variations up front) when TTFont.lazy=False (#2771).

• [TTFont] Added normalizeLocation method to normalize a location dict from the font’s defined axes space (also known as “user space”) into the normalized (-1..+1) space. It applies avar mapping if the font contains an avar table (#2789).

• [TTVarGlyphSet] Support drawing glyph instances from CFF2 variable glyph set (#2784).

• [fontBuilder] Do not error when building cmap if there are zero code points (#2785).

• [varLib.plot] Added ability to plot a variation model and set of accompaning master values corresponding to the model’s master locations into a pyplot figure (#2767).

• [Snippets] Added statShape.py script to draw statistical shape of a glyph as an ellips (requires pycairo) (baecd88).

• [TTVarGlyphSet] implement drawPoints natively, avoiding going through SegmentToPointPen (#2778).

• [TTVarGlyphSet] Fixed bug whereby drawing a composite glyph multiple times, its components would shif; needed an extra copy (#2774).

4.37.1 (released 2022-08-24)

• [subset] Fixed regression introduced with v4.37.0 while subsetting the VarStore of HVAR and VVAR tables, whereby an AttributeError: subset_varidxes was thrown because an apparently unused import statement (with the side-effect of dynamically binding that subset_varidxes method to the VarStore class) had been accidentally deleted in an unrelated PR (#2679, #2773).

• [pens] Added cairoPen (#2678).

• [gvar] Read gvar more lazily by not parsing all of the glyf table (#2771).

• [ttGlyphSet] Make drawPoints(pointPen) method work for CFF fonts as well via adapter pen (#2770).

4.37.0 (released 2022-08-23)

• [varLib.models] Reverted PR #2717 which added support for “narrow tents” in v4.36.0, as it introduced a regression (#2764, #2765). It will be restored in upcoming release once we found a solution to the bug.

• [cff.specializer] Fixed issue in charstring generalizer with the blend operator (#2750, #1975).

• [varLib.models] Added support for extrapolation (#2757).

• [ttGlyphSet] Ensure the newly added _TTVarGlyphSet inherits from _TTGlyphSet to keep backward compatibility with existing API (#2762).

• [kern] Allow compiling legacy kern tables with more than 64k entries (d21cfdede).

• [visitor] Added new visitor API to traverse tree of objects and dispatch based on the attribute type: cf. fontTools.misc.visitor and fontTools.ttLib.ttVisitor. Added fontTools.ttLib.scaleUpem module that uses the latter to change a font’s units-per-em and scale all the related fields accordingly (#2718, #2755).

4.36.0 (released 2022-08-17)

• [varLib.models] Use a simpler model that generates narrower “tents” (regions, master supports) whenever possible: specifically when any two axes that actively “cooperate” (have masters at non-zero positions for both axes) have a complete set of intermediates. The simpler algorithm produces fewer overlapping regions and behaves better with respect to rounding at the peak positions than the generic solver, always matching intermediate masters exactly, instead of maximally 0.5 units off. This may be useful when 100% metrics compatibility is desired (#2218, #2717).

• [feaLib] Remove warning when about GDEF not being built when explicitly not requested; don’t build one unconditonally even when not requested (#2744, also works around #2747).

• [ttFont] TTFont.getGlyphSet method now supports selecting a location that represents an instance of a variable font (supports both user-scale and normalized axes coordinates via the normalized=False parameter). Currently this only works for TrueType-flavored variable fonts (#2738).

4.35.0 (released 2022-08-15)

• [otData/otConverters] Added support for ‘biased’ PaintSweepGradient start/end angles to match latest COLRv1 spec (#2743).

• [varLib.instancer] Fixed bug in _instantiateFeatureVariations when at the same time pinning one axis and restricting the range of a subsequent axis; the wrong axis tag was being used in the latter step (as the records’ axisIdx was updated in the preceding step but looked up using the old axes order in the following step) (#2733, #2734).

• [mtiLib] Pad script tags with space when less than 4 char long (#1727).

• [merge] Use '.' instead of '#' in duplicate glyph names (#2742).

• [gvar] Added support for lazily loading glyph variations (#2741).

• [varLib] In build_many, we forgot to pass on colr_layer_reuse parameter to the build method (#2730).

• [svgPathPen] Add a main that prints SVG for input text (6df779fd).

• [cffLib.width] Fixed off-by-one in optimized values; previous code didn’t match the code block above it (2963fa50).

• [varLib.interpolatable] Support reading .designspace and .glyphs files (via optional glyphsLib).

• Compile some modules with Cython when available and building/installing fonttools from source: varLib.iup (35% faster), pens.momentsPen (makes varLib.interpolatable 3x faster).

• [feaLib] Allow features to be built for VF without also building a GDEF table (e.g. only build GSUB); warn when GDEF would be needed but isn’t requested (#2705, 2694).

• [otBase] Fixed AttributeError when uharfbuzz < 0.23.0 and ‘repack’ method is missing (32aa8eaf). Use new uharfbuzz.repack_with_tag when available (since uharfbuzz>=0.30.0), enables table-specific optimizations to be performed during repacking (#2724).

• [statisticsPen] By default report all glyphs (4139d891). Avoid division-by-zero (52b28f90).

• [feaLib] Added missing required argument to FeatureLibError exception (#2693)

• [varLib.merge] Fixed error during error reporting (#2689). Fixed undefined NotANone variable (#2714).

4.34.4 (released 2022-07-07)

• Fixed typo in varLib/merger.py that causes NameError merging COLR glyphs containing more than 255 layers (#2685).

4.34.3 (released 2022-07-07)

• [designspaceLib] Don’t make up bad PS names when no STAT data (#2684)

4.34.2 (released 2022-07-06)

• [varStore/subset] fixed KeyError exception to do with NO_VARIATION_INDEX while subsetting varidxes in GPOS/GDEF (a08140d).

4.34.1 (released 2022-07-06)

• [instancer] When optimizing HVAR/VVAR VarStore, use_NO_VARIATION_INDEX=False to avoid including NO_VARIATION_INDEX in AdvWidthMap, RsbMap, LsbMap mappings, which would push the VarIdx width to maximum (4bytes), which is not desirable. This also fixes a hard crash when attempting to subset a varfont after it had been partially instanced with use_NO_VARIATION_INDEX=True.

4.34.0 (released 2022-07-06)

• [instancer] Set RIBBI bits in head and OS/2 table when cutting instances and the subfamily nameID=2 contains strings like ‘Italic’ or ‘Bold’ (#2673).

• [otTraverse] Addded module containing methods for traversing trees of otData tables (#2660).

• [otTables] Made DeltaSetIndexMap TTX dump less verbose by omitting no-op entries (#2660).

• [colorLib.builder] Added option to disable PaintColrLayers’s reuse of layers from LayerList (#2660).

• [varLib] Added support for merging multiple master COLRv1 tables into a variable COLR table (#2660, #2328). Base color glyphs of same name in different masters must have identical paint graph structure (incl. number of layers, palette indices, number of color line stops, corresponding paint formats at each level of the graph), but can differ in the variable fields (e.g. PaintSolid.Alpha). PaintVar* tables are produced when this happens and a VarStore/DeltaSetIndexMap is added to the variable COLR table. It is possible for non-default masters to be ‘sparse’, i.e. omit some of the color glyphs present in the default master.

• [feaLib] Let the Parser set nameIDs 1 through 6 that were previously reserved (#2675).

• [varLib.varStore] Support NO_VARIATION_INDEX in optimizer and instancer.

• [feaLib] Show all missing glyphs at once at end of parsing (#2665).

• [varLib.iup] Rewrite force-set conditions and limit DP loopback length (#2651). For Noto Sans, IUP time drops from 23s down to 9s, with only a slight size increase in the final font. This basically turns the algorithm from O(n^3) into O(n).

• [featureVars] Report about missing glyphs in substitution rules (#2654).

• [mutator/instancer] Added CLI flag to –no-recalc-timestamp (#2649).

• [SVG] Allow individual SVG documents in SVG OT table to be compressed on uncompressed, and remember that when roundtripping to/from ttx. The SVG.docList is now a list of SVGDocument namedtuple-like dataclass containing an extra compressed field, and no longer a bare 3-tuple (#2645).

• [designspaceLib] Check for descriptor types with hasattr() to allow custom classes that don’t inherit the default descriptors (#2634).

• [subset] Enable sharing across subtables of extension lookups for harfbuzz packing (#2626). Updated how table packing falls back to fontTools from harfbuzz (#2668).

• [subset] Updated default feature tags following current Harfbuzz (#2637).

• [svgLib] Fixed regex for real number to support e.g. 1e-4 in addition to 1.0e-4. Support parsing negative rx, ry on arc commands (#2596, #2611).

• [subset] Fixed subsetting SinglePosFormat2 when ValueFormat=0 (#2603).

4.33.3 (released 2022-04-26)

• [designspaceLib] Fixed typo in deepcopyExceptFonts method, preventing font references to be transferred (#2600). Fixed another typo in the name of Range dataclass’s __post_init__ magic method (#2597).

4.33.2 (released 2022-04-22)

• [otBase] Make logging less verbose when harfbuzz fails to serialize. Do not exit at the first failure but continue attempting to fix offset overflow error using the pure-python serializer even when the USE_HARFBUZZ_REPACKER option was explicitly set to True. This is normal with fonts with relatively large tables, at least until hb.repack implements proper table splitting.

4.33.1 (released 2022-04-22)

• [otlLib] Put back the FONTTOOLS_GPOS_COMPACT_MODE environment variable to fix regression in ufo2ft (and thus fontmake) introduced with v4.33.0 (#2592, #2593). This is deprecated and will be removed one ufo2ft gets updated to use the new config setup.

4.33.0 (released 2022-04-21)

• [OS/2 / merge] Automatically recalculate OS/2.xAvgCharWidth after merging fonts with fontTools.merge (#2591, #2538).

• [misc/config] Added fontTools.misc.configTools module, a generic configuration system (#2416, #2439). Added fontTools.config module, a fontTools-specific configuration system using configTools above. Attached a Config object to TTFont.

• [otlLib] Replaced environment variable for GPOS compression level with an equivalent option using the new config system.

• [designspaceLib] Incremented format version to 5.0 (#2436). Added discrete axes, variable fonts, STAT information, either design- or user-space location on instances. Added fontTools.designspaceLib.split module to split a designspace into sub-spaces that interpolate and that represent the variable fonts listed in the document. Made instance names optional and allow computing them from STAT data instead. Added fontTools.designspaceLib.statNames module. Allow instances to have the same location as a previously defined STAT label. Deprecated some attributes: SourceDescriptor: copyLib, copyInfo, copyGroups, copyFeatures. InstanceDescriptor: kerning, info; glyphs: use rules or sparse sources. For both, location: use the more explicit designLocation. Note: all are soft deprecations and existing code should keep working. Updated documentation for Python methods and the XML format.

• [varLib] Added build_many to build several variable fonts from a single designspace document (#2436). Added fontTools.varLib.stat module to build STAT tables from a designspace document.

• [otBase] Try to use the Harfbuzz Repacker for packing GSUB/GPOS tables when uharfbuzz python bindings are available (#2552). Disable it by setting the “fontTools.ttLib.tables.otBase:USE_HARFBUZZ_REPACKER” config option to False. If the option is set explicitly to True but uharfbuzz can’t be imported or fails to serialize for any reasons, an error will be raised (ImportError or uharfbuzz errors).

• [CFF/T2] Ensure that pen.closePath() gets called for CFF2 charstrings (#2577). Handle implicit CFF2 closePath within T2OutlineExtractor (#2580).

4.32.0 (released 2022-04-08)

• [otlLib] Disable GPOS7 optimization to work around bug in Apple CoreText. Always force Chaining GPOS8 for now (#2540).

• [glifLib] Added outputImpliedClosingLine=False parameter to Glyph.draw(), to control behaviour of PointToSegmentPen (6b4e2e7).

• [varLib.interpolatable] Check for wrong contour starting point (#2571).

• [cffLib] Remove leftover GlobalState class and fix calls to TopDictIndex() (#2569, #2570).

• [instancer] Clear AxisValueArray if it is empty after instantiating (#2563).

4.31.2 (released 2022-03-22)

• [varLib] fix instantiation of GPOS SinglePos values (#2555).

4.31.1 (released 2022-03-18)

• [subset] fix subsetting OT-SVG when glyph id attribute is on the root <svg> element (#2553).

4.31.0 (released 2022-03-18)

• [ttCollection] Fixed ‘ResourceWarning: unclosed file’ warning (#2549).

• [varLib.merger] Handle merging SinglePos with valueformat=0 (#2550).

• [ttFont] Update glyf’s glyphOrder when calling TTFont.setGlyphOrder() (#2544).

• [ttFont] Added ensureDecompiled method to load all tables irrespective of the lazy attribute (#2551).

• [otBase] Added iterSubTable method to iterate over BaseTable’s children of type BaseTable; useful for traversing a tree of otTables (#2551).

4.30.0 (released 2022-03-10)

• [varLib] Added debug logger showing the glyph name for which gvar is built (#2542).

• [varLib.errors] Fixed undefined names in FoundANone and UnsupportedFormat exceptions (ac4d5611).

• [otlLib.builder] Added windowsNames and macNames (bool) parameters to the buildStatTabe function, so that one can select whether to only add one or both of the two sets (#2528).

• [t1Lib] Added the ability to recreate PostScript stream (#2504).

• [name] Added getFirstDebugName, getBest{Family,SubFamily,Full}Name methods (#2526).

4.29.1 (released 2022-02-01)

• [colorLib] Fixed rounding issue with radial gradient’s start/end circles inside one another (#2521).

• [freetypePen] Handle rotate/skew transform when auto-computing width/height of the buffer; raise PenError wen missing moveTo (#2517)

4.29.0 (released 2022-01-24)

• [ufoLib] Fixed illegal characters and expanded reserved filenames (#2506).

• [COLRv1] Don’t emit useless PaintColrLayers of lenght=1 in LayerListBuilder (#2513).

• [ttx] Removed legacy waitForKeyPress method on Windows (#2509).

• [pens] Added FreeTypePen that uses freetype-py and the pen protocol for rasterizating outline paths (#2494).

• [unicodedata] Updated the script direction list to Unicode 14.0 (#2484). Bumped unicodedata2 dependency to 14.0 (#2499).

• [psLib] Fixed type of fontName in suckfont (#2496).

4.28.5 (released 2021-12-19)

• [svgPathPen] Continuation of #2471: make sure all occurrences of str() are now replaced with user-defined ntos callable.

• [merge] Refactored code into submodules, plus several bugfixes and improvements: fixed duplicate-glyph-resolution GSUB-lookup generation code; use tolerance in glyph comparison for empty glyph’s width; ignore space of default ignorable glyphs; downgrade duplicates-resolution missing-GSUB from assert to warn; added –drop-tables option (#2473, #2475, #2476).

4.28.4 (released 2021-12-15)

• [merge] Merge GDEF marksets in Lookups properly (#2474).

• [feaLib] Have fontTools feaLib script exit with error code when build fails (#2459)

• [svgPathPen] Added ntos option to customize number formatting (e.g. rounding) (#2471).

• [subset] Speed up subsetting of large CFF fonts (#2467).

• [otTables] Speculatively promote lookups to extension to speed up compilation. If the offset to lookup N is too big to fit in a ushort, the offset to lookup N+1 is going to be too big as well, so we promote to extension all lookups from lookup N onwards (#2465).

4.28.3 (released 2021-12-03)

• [subset] Fixed bug while subsetting COLR table, whereby incomplete layer records pointing to missing glyphs were being retained leading to struct.error upon compiling. Make it so that glyf glyph closure, which follows the COLR glyph closure, does not influence the COLR table subsetting (#2461, #2462).

• [docs] Fully document the cmap and glyf tables (#2454, #2457).

• [colorLib.unbuilder] Fixed CLI by deleting no longer existing parameter (180bb1867).

4.28.2 (released 2021-11-22)

• [otlLib] Remove duplicates when building coverage (#2433).

• [docs] Add interrogate configuration (#2443).

• [docs] Remove comment about missing “start” optional argument to calcChecksum (#2448).

• [cu2qu/cli] Adapt to the latest ufoLib2.

• [subset] Support subsetting SVG table and remove it from the list of drop by default tables (#534).

• [subset] add --pretty-svg option to pretty print SVG table contents (#2452).

• [merge] Support merging CFF tables (CID-keyed CFF is still not supported) (#2447).

• [merge] Support --output-file (#2447).

• [docs] Split table docs into individual pages (#2444).

• [feaLib] Forbid empty classes (#2446).

• [docs] Improve documentation for fontTools.ttLib.ttFont (#2442).

4.28.1 (released 2021-11-08)

• [subset] Fixed AttributeError while traversing a color glyph’s Paint graph when there is no LayerList, which is optional (#2441).

4.28.0 (released 2021-11-05)

• Dropped support for EOL Python 3.6, require Python 3.7 (#2417).

• [ufoLib/glifLib] Make filename-clash checks faster by using a set instead of a list (#2422).

• [subset] Don’t crash if optional ClipList and LayerList are None (empty) (#2424, 2439).

• [OT-SVG] Removed support for old deprecated version 1 and embedded color palettes, which were never officially part of the OpenType SVG spec. Upon compile, reuse offsets to SVG documents that are identical (#2430).

• [feaLib] Added support for Variable Feature File syntax. This is experimental and subject to change until it is finalized in the Adobe FEA spec (#2432).

• [unicodedata] Update Scripts/ScriptExtensions/Blocks to UnicodeData 14.0 (#2437).

4.27.1 (released 2021-09-23)

• [otlLib] Fixed error when chained contextual lookup builder overflows (#2404, #2411).

• [bezierTools] Fixed two floating-point bugs: one when computing t for a point lying on an almost horizontal/vertical line; another when computing the intersection point between a curve and a line (#2413).

4.27.0 (released 2021-09-14)

• [ttLib/otTables] Cleaned up virtual GID handling: allow virtual GIDs in Coverage and ClassDef readers; removed unused allowVID argument from TTFont constructor, and requireReal argument in TTFont.getGlyphID method. Make TTFont.setGlyphOrder clear reverse glyphOrder map, and assume glyphOrder internal attribute is never modified outside setGlyphOrder; added TTFont.getGlyphNameMany and getGlyphIDMany (#1536, #1654, #2334, #2398).

• [py23] Dropped internal use of fontTools.py23 module to fix deprecation warnings in client code that imports from fontTools (#2234, #2399, #2400).

• [subset] Fix subsetting COLRv1 clip boxes when font is loaded lazily (#2408).

4.26.2 (released 2021-08-09)

• [otTables] Added missing CompositeMode.PLUS operator (#2390).

4.26.1 (released 2021-08-03)

• [transform] Added transformVector and transformVectors methods to the Transform class. Similar to transformPoint but ignore the translation part (#2386).

4.26.0 (released 2021-08-03)

• [xmlWriter] Default to "\n" for newlinestr instead of platform-specific os.linesep (#2384).

• [otData] Define COLRv1 ClipList and ClipBox (#2379).

• [removeOverlaps/instancer] Added –ignore-overlap-errors option to work around Skia PathOps.Simplify bug (#2382, #2363, google/fonts#3365).

• NOTE: This will be the last version to support Python 3.6. FontTools will require Python 3.7 or above from the next release (#2350)

4.25.2 (released 2021-07-26)

• [COLRv1] Various changes to sync with the latest CORLv1 draft spec. In particular: define COLR.VarIndexMap, remove/inline ColorIndex struct, add VarIndexBase to PaintVar* tables (#2372); add reduced-precicion specialized transform Paints; define Angle as fraction of half circle encoded as F2Dot14; use FWORD (int16) for all Paint center coordinates; change PaintTransform to have an offset to Affine2x3;

• [ttLib] when importing XML, only set sfntVersion if the font has no reader and is empty (#2376)

4.25.1 (released 2021-07-16)

• [ttGlyphPen] Fixed bug in TTGlyphPointPen, whereby open contours (i.e. starting with segmentType “move”) would throw NotImplementedError. They are now treated as if they are closed, like with the TTGlyphPen (#2364, #2366).

4.25.0 (released 2021-07-05)

• [tfmLib] Added new library for parsing TeX Font Metric (TFM) files (#2354).

• [TupleVariation] Make shared tuples order deterministic on python < 3.7 where Counter (subclass of dict) doesn’t remember insertion order (#2351, #2353).

• [otData] Renamed COLRv1 structs to remove ‘v1’ suffix and match the updated draft spec: ‘LayerV1List’ -> ‘LayerList’, ‘BaseGlyphV1List’ -> ‘BaseGlyphList’, ‘BaseGlyphV1Record’ -> ‘BaseGlyphPaintRecord’ (#2346). Added 8 new PaintScale* tables: with/without centers, uniform vs non-uniform. Added *AroundCenter variants to PaintRotate and PaintSkew: the default versions no longer have centerX/Y, but default to origin. PaintRotate, PaintSkew and PaintComposite formats were re-numbered. NOTE: these are breaking changes; clients using the experimental COLRv1 API will have to be updated (#2348).

• [pointPens] Allow GuessSmoothPointPen to accept a tolerance. Fixed call to math.atan2 with x/y parameters inverted. Sync the code with fontPens (#2344).

• [post] Fixed parsing post table format 2.0 when it contains extra garbage at the end of the stringData array (#2314).

• [subset] drop empty features unless ‘size’ with FeatureParams table (#2324).

• [otlLib] Added otlLib.optimize module; added GPOS compaction algorithm. The compaction can be run on existing fonts with fonttools otlLib.optimize or using the snippet compact_gpos.py. There’s experimental support for compacting fonts at compilation time using an environment variable, but that might be removed later (#2326).

4.24.4 (released 2021-05-25)

• [subset/instancer] Fixed AttributeError when instantiating a VF that contains GPOS ValueRecords with Device tables but without the respective non-Device values (e.g. XAdvDevice without XAdvance). When not explicitly set, the latter are assumed to be 0 (#2323).

4.24.3 (released 2021-05-20)

• [otTables] Fixed AttributeError in methods that split LigatureSubst, MultipleSubst and AlternateSubst subtables when an offset overflow occurs. The Format attribute was removed in v4.22.0 (#2319).

4.24.2 (released 2021-05-20)

• [ttGlyphPen] Fixed typing annotation of TTGlyphPen glyphSet parameter (#2315).

• Fixed two instances of DeprecationWarning: invalid escape sequence (#2311).

4.24.1 (released 2021-05-20)

• [subset] Fixed AttributeError when SinglePos subtable has None Value (ValueFormat 0) (#2312, #2313).

4.24.0 (released 2021-05-17)

• [pens] Add ttGlyphPen.TTGlyphPointPen similar to TTGlyphPen (#2205).

4.23.1 (released 2021-05-14)

• [subset] Fix KeyError after subsetting COLR table that initially contains both v0 and v1 color glyphs when the subset only requested v1 glyphs; we were not pruning the v0 portion of the table (#2308).

• [colorLib] Set LayerV1List attribute to None when empty, it’s optional in CORLv1 (#2308).

4.23.0 (released 2021-05-13)

• [designspaceLib] Allow to use \\UNC absolute paths on Windows (#2299, #2306).

• [varLib.merger] Fixed bug where VarLibMergeError was raised with incorrect parameters (#2300).

• [feaLib] Allow substituting a glyph class with NULL to delete multiple glyphs (#2303).

• [glyf] Fixed NameError exception in getPhantomPoints (#2295, #2305).

• [removeOverlaps] Retry pathops.simplify after rounding path coordinates to integers if it fails the first time using floats, to work around a rare and hard to debug Skia bug (#2288).

• [varLib] Added support for building, reading, writing and optimizing 32-bit ItemVariationStore as used in COLRv1 table (#2285).

• [otBase/otConverters] Add array readers/writers for int types (#2285).

• [feaLib] Allow more than one lookahead glyph/class in contextual positioning with “value at end” (#2293, #2294).

• [COLRv1] Default varIdx should be 0xFFFFFFFF (#2297, #2298).

• [pens] Make RecordingPointPen actually pass on identifiers; replace asserts with explicit PenError exception (#2284).

• [mutator] Round lsb for CF2 fonts as well (#2286).

4.22.1 (released 2021-04-26)

• [feaLib] Skip references to named lookups if the lookup block definition is empty, similarly to makeotf. This also fixes an AttributeError while generating aalt feature (#2276, #2277).

• [subset] Fixed bug with --no-hinting implementation for Device tables (#2272, #2275). The previous code was alwyas dropping Device tables if no-hinting was requested, but some Device tables (DeltaFormat=0x8000) are also used to encode variation indices and need to be retained.

• [otBase] Fixed bug in getting the ValueRecordSize when decompiling MVAR table with lazy=True (#2273, #2274).

• [varLib/glyf/gvar] Optimized and simplified GlyphCoordinates and TupleVariation classes, use bytearray where possible, refactored phantom-points calculations. We measured about 30% speedup in total time of loading master ttfs, building gvar, and saving (#2261, #2266).

• [subset] Fixed AssertionError while pruning unused CPAL palettes when 0xFFFF is present (#2257, #2259).

4.22.0 (released 2021-04-01)

• [ttLib] Remove .Format from Coverage, ClassDef, SingleSubst, LigatureSubst, AlternateSubst, MultipleSubst (#2238). ATTENTION: This will change your TTX dumps!

• [misc.arrayTools] move Vector to its own submodule, and rewrite as a tuple subclass (#2201).

• [docs] Added a terminology section for varLib (#2209).

• [varLib] Move rounding to VariationModel, to avoid error accumulation from multiple deltas (#2214)

• [varLib] Explain merge errors in more human-friendly terms (#2223, #2226)

• [otlLib] Correct some documentation (#2225)

• [varLib/otlLib] Allow merging into VariationFont without first saving GPOS PairPos2 (#2229)

• [subset] Improve PairPosFormat2 subsetting (#2221)

• [ttLib] TTFont.save: create file on disk as late as possible (#2253)

• [cffLib] Add missing CFF2 dict operators LanguageGroup and ExpansionFactor (#2249) ATTENTION: This will change your TTX dumps!

4.21.1 (released 2021-02-26)

• [pens] Reverted breaking change that turned AbstractPen and AbstractPointPen into abstract base classes (#2164, #2198).

4.21.0 (released 2021-02-26)

• [feaLib] Indent anchor statements in asFea() to make them more legible and diff-able (#2193).

• [pens] Turn AbstractPen and AbstractPointPen into abstract base classes (#2164).

• [feaLib] Added support for parsing and building STAT table from AFDKO feature files (#2039).

• [instancer] Added option to update name table of generated instance using STAT table’s axis values (#2189).

• [bezierTools] Added functions to compute bezier point-at-time, as well as line-line, curve-line and curve-curve intersections (#2192).

4.20.0 (released 2021-02-15)

• [COLRv1] Added unbuildColrV1 to deconstruct COLRv1 otTables to raw json-able data structure; it does the reverse of buildColrV1 (#2171).

• [feaLib] Allow sub X by NULL sequence to delete a glyph (#2170).

• [arrayTools] Fixed Vector division (#2173).

• [COLRv1] Define new PaintSweepGradient (#2172).

• [otTables] Moved Paint.Format enum class outside of Paint class definition, now named PaintFormat. It was clashing with paint instance Format attribute and thus was breaking lazy load of COLR table which relies on magic __getattr__ (#2175).

• [COLRv1] Replace hand-coded builder functions with otData-driven dynamic implementation (#2181).

• [COLRv1] Define additional static (non-variable) Paint formats (#2181).

• [subset] Added support for subsetting COLR v1 and CPAL tables (#2174, #2177).

• [fontBuilder] Allow setupFvar to optionally take designspaceLib.AxisDescriptor objects. Added new setupAvar method. Support localised names for axes and named instances (#2185).

4.19.1 (released 2021-01-28)

• [woff2] An initial off-curve point with an overlap flag now stays an off-curve point after compression.

4.19.0 (released 2021-01-25)

• [codecs] Handle errors parameter different from ‘strict’ for the custom extended mac encodings (#2137, #2132).

• [featureVars] Raise better error message when a script is missing the required default language system (#2154).

• [COLRv1] Avoid abrupt change caused by rounding PaintRadialGradient.c0 when the start circle almost touches the end circle’s perimeter (#2148).

• [COLRv1] Support building unlimited lists of paints as 255-ary trees of PaintColrLayers tables (#2153).

• [subset] Prune redundant format-12 cmap subtables when all non-BMP characters are dropped (#2146).

• [basePen] Raise MissingComponentError instead of bare KeyError when a referenced component is missing (#2145).

4.18.2 (released 2020-12-16)

• [COLRv1] Implemented PaintTranslate paint format (#2129).

• [varLib.cff] Fixed unbound local variable error (#1787).

• [otlLib] Don’t crash when creating OpenType class definitions if some glyphs occur more than once (#2125).

4.18.1 (released 2020-12-09)

• [colorLib] Speed optimization for LayerV1ListBuilder (#2119).

• [mutator] Fixed missing tab in interpolate_cff2_metrics (0957dc7a).

4.18.0 (released 2020-12-04)

• [COLRv1] Update to latest draft: added PaintRotate and PaintSkew (#2118).

• [woff2] Support new brotlicffi bindings for PyPy (#2117).

• [glifLib] Added expectContentsFile parameter to GlyphSet, for use when reading existing UFOs, to comply with the specification stating that a contents.plist file must exist in a glyph set (#2114).

• [subset] Allow LangSys tags in --layout-scripts option (#2112). For example: --layout-scripts=arab.dflt,arab.URD,latn; this will keep DefaultLangSys and URD language for arab script, and all languages for latn script.

• [varLib.interpolatable] Allow UFOs to be checked; report open paths, non existant glyphs; add a --json option to produce a machine-readable list of incompatibilities

• [pens] Added QuartzPen to create CGPath from glyph outlines on macOS. Requires pyobjc (#2107).

• [feaLib] You can export FONTTOOLS_LOOKUP_DEBUGGING=1 to enable feature file debugging info stored in Debg table (#2106).

• [otlLib] Build more efficient format 1 and format 2 contextual lookups whenever possible (#2101).

4.17.1 (released 2020-11-16)

• [colorLib] Fixed regression in 4.17.0 when building COLR v0 table; when color layers are stored in UFO lib plist, we can’t distinguish tuples from lists so we need to accept either types (e5439eb9, googlefonts/ufo2ft/issues#426).

4.17.0 (released 2020-11-12)

• [colorLib/otData] Updated to latest draft COLR v1 spec (#2092).

• [svgLib] Fixed parsing error when arc commands’ boolean flags are not separated by space or comma (#2094).

• [varLib] Interpret empty non-default glyphs as ‘missing’, if the default glyph is not empty (#2082).

• [feaLib.builder] Only stash lookup location for Debg if Builder.buildLookups_ has cooperated (#2065, #2067).

• [varLib] Fixed bug in VarStore optimizer (#2073, #2083).

• [varLib] Add designspace lib key for custom feavar feature tag (#2080).

• Add HashPointPen adapted from psautohint. With this pen, a hash value of a glyph can be computed, which can later be used to detect glyph changes (#2005).

4.16.1 (released 2020-10-05)

• [varLib.instancer] Fixed TypeError exception when instantiating a VF with a GSUB table 1.1 in which FeatureVariations attribute is present but set to None – indicating that optional FeatureVariations is missing (#2077).

• [glifLib] Make x and y attributes of the point element required even when validation is turned off, and raise a meaningful GlifLibError message when that happens (#2075).

4.16.0 (released 2020-09-30)

• [removeOverlaps] Added new module and removeOverlaps function that merges overlapping contours and components in TrueType glyphs. It requires the skia-pathops module. Note that removing overlaps invalidates the TrueType hinting (#2068).

• [varLib.instancer] Added --remove-overlaps command-line option. The overlap option in instantiateVariableFont now takes an OverlapMode enum: 0: KEEP_AND_DONT_SET_FLAGS, 1: KEEP_AND_SET_FLAGS (default), and 2: REMOVE. The latter is equivalent to calling removeOverlaps on the generated static instance. The option continues to accept bool value for backward compatibility.

4.15.0 (released 2020-09-21)

• [plistlib] Added typing annotations to plistlib module. Set up mypy static typechecker to run automatically on CI (#2061).

• [ttLib] Implement private Debg table, a reverse-DNS namespaced JSON dict.

• [feaLib] Optionally add an entry into the Debg table with the original lookup name (if any), feature name / script / language combination (if any), and original source filename and line location. Annotate the ttx output for a lookup with the information from the Debg table (#2052).

• [sfnt] Disabled checksum checking by default in SFNTReader (#2058).

• [Docs] Document mtiLib module (#2027).

• [varLib.interpolatable] Added checks for contour node count and operation type of each node (#2054).

• [ttLib] Added API to register custom table packer/unpacker classes (#2055).

4.14.0 (released 2020-08-19)

• [feaLib] Allow anonymous classes in LookupFlags definitions (#2037).

• [Docs] Better document DesignSpace rules processing order (#2041).

• [ttLib] Fixed 21-year old bug in maxp.maxComponentDepth calculation (#2044, #2045).

• [varLib.models] Fixed misspelled argument name in CLI entry point (81d0042a).

• [subset] When subsetting GSUB v1.1, fixed TypeError by checking whether the optional FeatureVariations table is present (e63ecc5b).

• [Snippets] Added snippet to show how to decompose glyphs in a TTF (#2030).

• [otlLib] Generate GSUB type 5 and GPOS type 7 contextual lookups where appropriate (#2016).

4.13.0 (released 2020-07-10)

• [feaLib/otlLib] Moved lookup subtable builders from feaLib to otlLib; refactored some common code (#2004, #2007).

• [docs] Document otlLib module (#2009).

• [glifLib] Fixed bug with some UFO .glif filenames clashing on case-insensitive filesystems (#2001, #2002).

• [colorLib] Updated COLRv1 implementation following changes in the draft spec: (#2008, googlefonts/colr-gradients-spec#24).

4.12.1 (released 2020-06-16)

• [_n_a_m_e] Fixed error in addMultilingualName with one-character names. Only attempt to recovered malformed UTF-16 data from a bytes string, not from unicode str (#1997, #1998).

4.12.0 (released 2020-06-09)

• [otlLib/varLib] Ensure that the AxisNameID in the STAT and fvar tables is grater than 255 as per OpenType spec (#1985, #1986).

• [docs] Document more modules in fontTools.misc package: filenames, fixedTools, intTools, loggingTools, macCreatorType, macRes, plistlib (#1981).

• [OS/2] Don’t calculate whole sets of unicode codepoints, use faster and more memory efficient ranges and bisect lookups (#1984).

• [voltLib] Support writing back abstract syntax tree as VOLT data (#1983).

• [voltLib] Accept DO_NOT_TOUCH_CMAP keyword (#1987).

• [subset/merge] Fixed a namespace clash involving a private helper class (#1955).

4.11.0 (released 2020-05-28)

• [feaLib] Introduced includeDir parameter on Parser and IncludingLexer to explicitly specify the directory to search when include() statements are encountered (#1973).

• [ufoLib] Silently delete duplicate glyphs within the same kerning group when reading groups (#1970).

• [ttLib] Set version of COLR table when decompiling COLRv1 (commit 9d8a7e2).

4.10.2 (released 2020-05-20)

• [sfnt] Fixed NameError: SimpleNamespace while reading TTC header. The regression was introduced with 4.10.1 after removing py23 star import.

4.10.1 (released 2020-05-19)

• [sfnt] Make SFNTReader pickleable even when TTFont is loaded with lazy=True option and thus keeps a reference to an external file (#1962, #1967).

• [feaLib.ast] Restore backward compatibility (broken in 4.10 with #1905) for ChainContextPosStatement and ChainContextSubstStatement classes. Make them accept either list of lookups or list of lists of lookups (#1961).

• [docs] Document some modules in fontTools.misc package: arrayTools, bezierTools cliTools and eexec (#1956).

• [ttLib._n_a_m_e] Fixed findMultilingualName() when name record’s string is encoded as bytes sequence (#1963).

4.10.0 (released 2020-05-15)

• [varLib] Allow feature variations to be active across the entire space (#1957).

• [ufoLib] Added support for formatVersionMinor in UFO’s fontinfo.plist and for formatMinor attribute in GLIF file as discussed in unified-font-object/ufo-spec#78. No changes in reading or writing UFOs until an upcoming (non-0) minor update of the UFO specification is published (#1786).

• [merge] Fixed merging fonts with different versions of OS/2 table (#1865, #1952).

• [subset] Fixed AttributeError while subsetting ContextSubst and ContextPos Format 3 subtable (#1879, #1944).

• [ttLib.table._m_e_t_a] if data happens to be ascii, emit comment in TTX (#1938).

• [feaLib] Support multiple lookups per glyph position (#1905).

• [psCharStrings] Use inheritance to avoid repeated code in initializer (#1932).

• [Doc] Improved documentation for the following modules: afmLib (#1933), agl (#1934), cffLib (#1935), cu2qu (#1937), encodings (#1940), feaLib (#1941), merge (#1949).

• [Doc] Split off developer-centric info to new page, making front page of docs more user-focused. List all utilities and sub-modules with brief descriptions. Make README more concise and focused (#1914).

• [otlLib] Add function to build STAT table from high-level description (#1926).

• [ttLib._n_a_m_e] Add findMultilingualName() method (#1921).

• [unicodedata] Update RTL_SCRIPTS for Unicode 13.0 (#1925).

• [gvar] Sort gvar XML output by glyph name, not glyph order (#1907, #1908).

• [Doc] Added help options to fonttools command line tool (#1913, #1920). Ensure all fonttools CLI tools have help documentation (#1948).

• [ufoLib] Only write fontinfo.plist when there actually is content (#1911).

4.9.0 (released 2020-04-29)

• [subset] Fixed subsetting of FeatureVariations table. The subsetter no longer drops FeatureVariationRecords that have empty substitutions as that will keep the search going and thus change the logic. It will only drop empty records that occur at the end of the FeatureVariationRecords array (#1881).

• [subset] Remove FeatureVariations table and downgrade GSUB/GPOS to version 0x10000 when FeatureVariations contain no FeatureVariationRecords after subsetting (#1903).

• [agl] Add support for legacy Adobe Glyph List of glyph names in fontTools.agl (#1895).

• [feaLib] Ignore superfluous script statements (#1883).

• [feaLib] Hide traceback by default on fonttools feaLib command line. Use --traceback option to show (#1898).

• [feaLib] Check lookup index in chaining sub/pos lookups and print better error message (#1896, #1897).

• [feaLib] Fix building chained alt substitutions (#1902).

• [Doc] Included all fontTools modules in the sphinx-generated documentation, and published it to ReadTheDocs for continuous documentation of the fontTools project (#1333). Check it out at https://fonttools.readthedocs.io/. Thanks to Chris Simpkins!

• [transform] The Transform class is now subclass of typing.NamedTuple. No change in functionality (#1904).

4.8.1 (released 2020-04-17)

• [feaLib] Fixed AttributeError: 'NoneType' has no attribute 'getAlternateGlyphs' when aalt feature references a chain contextual substitution lookup (googlefonts/fontmake#648, #1878).

4.8.0 (released 2020-04-16)

• [feaLib] If Parser is initialized without a glyphNames parameter, it cannot distinguish between a glyph name containing an hyphen, or a range of glyph names; instead of raising an error, it now interprets them as literal glyph names, while also outputting a logging warning to alert user about the ambiguity (#1768, #1870).

• [feaLib] When serializing AST to string, emit spaces around hyphens that denote ranges. Also, fixed an issue with CID ranges when round-tripping AST->string->AST (#1872).

• [Snippets/otf2ttf] In otf2ttf.py script update LSB in hmtx to match xMin (#1873).

• [colorLib] Added experimental support for building COLR v1 tables as per the colr-gradients-spec draft proposal. NOTE: both the API and the XML dump of COLR v1 are susceptible to change while the proposal is being discussed and formalized (#1822).

4.7.0 (released 2020-04-03)

• [cu2qu] Added fontTools.cu2qu package, imported from the original cu2qu project. The cu2qu.pens module was moved to fontTools.pens.cu2quPen. The optional cu2qu extension module can be compiled by installing Cython before installing fonttools from source (i.e. git repo or sdist tarball). The wheel package that is published on PyPI (i.e. the one pip downloads, unless --no-binary option is used), will continue to be pure-Python for now (#1868).

4.6.0 (released 2020-03-24)

• [varLib] Added support for building variable BASE table version 1.1 (#1858).

• [CPAL] Added fromRGBA method to Color class (#1861).

4.5.0 (released 2020-03-20)

• [designspaceLib] Added add{Axis,Source,Instance,Rule}Descriptor methods to DesignSpaceDocument class, to initialize new descriptor objects using keyword arguments, and at the same time append them to the current document (#1860).

• [unicodedata] Update to Unicode 13.0 (#1859).

4.4.3 (released 2020-03-13)

• [varLib] Always build gvar table for TrueType-flavored Variable Fonts, even if it contains no variation data. The table is required according to the OpenType spec (#1855, #1857).

4.4.2 (released 2020-03-12)

• [ttx] Annotate LookupFlag in XML dump with comment explaining what bits are set and what they mean (#1850).

• [feaLib] Added more descriptive message to IncludedFeaNotFound error (#1842).

4.4.1 (released 2020-02-26)

• [woff2] Skip normalizing glyf and loca tables if these are missing from a font (e.g. in NotoColorEmoji using CBDT/CBLC tables).

• [timeTools] Use non-localized date parsing in timestampFromString, to fix error when non-English LC_TIME locale is set (#1838, #1839).

• [fontBuilder] Make sure the CFF table generated by fontBuilder can be used by varLib without having to compile and decompile the table first. This was breaking in converting the CFF table to CFF2 due to some unset attributes (#1836).

4.4.0 (released 2020-02-18)

• [colorLib] Added fontTools.colorLib.builder module, initially with buildCOLR and buildCPAL public functions. More color font formats will follow (#1827).

• [fontBuilder] Added setupCOLR and setupCPAL methods (#1826).

• [ttGlyphPen] Quantize GlyphComponent.transform floats to F2Dot14 to fix round-trip issue when computing bounding boxes of transformed components (#1830).

• [glyf] If a component uses reference points (firstPt and secondPt) for alignment (instead of X and Y offsets), compute the effective translation offset after having applied any transform (#1831).

• [glyf] When all glyphs have zero contours, compile glyf table data as a single null byte in order to pass validation by OTS and Windows (#1829).

• [feaLib] Parsing feature code now ensures that referenced glyph names are part of the known glyph set, unless a glyph set was not provided.

• [varLib] When filling in the default axis value for a missing location of a source or instance, correctly map the value forward.

• [varLib] The avar table can now contain mapping output values that are greater than OR EQUAL to the preceeding value, as the avar specification allows this.

• [varLib] The errors of the module are now ordered hierarchically below VarLibError. See #1821.

4.3.0 (released 2020-02-03)

• [EBLC/CBLC] Fixed incorrect padding length calculation for Format 3 IndexSubTable (#1817, #1818).

• [varLib] Fixed error when merging OTL tables and TTFonts were loaded as lazy=True (#1808, #1809).

• [varLib] Allow to use master fonts containing CFF2 table when building VF (#1816).

• [ttLib] Make recalcBBoxes option work also with CFF2 table (#1816).

• [feaLib] Don’t reset lookupflag in lookups defined inside feature blocks. They will now inherit the current lookupflag of the feature. This is what Adobe makeotf also does in this case (#1815).

• [feaLib] Fixed bug with mixed single/multiple substitutions. If a single substitution involved a glyph class, we were incorrectly using only the first glyph in the class (#1814).

4.2.5 (released 2020-01-29)

• [feaLib] Do not fail on duplicate multiple substitutions, only warn (#1811).

• [subset] Optimize SinglePos subtables to Format 1 if all ValueRecords are the same (#1802).

4.2.4 (released 2020-01-09)

• [unicodedata] Update RTL_SCRIPTS for Unicode 11 and 12.

4.2.3 (released 2020-01-07)

• [otTables] Fixed bug when splitting MarkBasePos subtables as offsets overflow. The mark class values in the split subtable were not being updated, leading to invalid mark-base attachments (#1797, googlefonts/noto-source#145).

• [feaLib] Only log a warning instead of error when features contain duplicate substitutions (#1767).

• [glifLib] Strip XML comments when parsing with lxml (#1784, #1785).

4.2.2 (released 2019-12-12)

• [subset] Fixed issue with subsetting FeatureVariations table when the index of features changes as features get dropped. The feature index need to be remapped to point to index of the remaining features (#1777, #1782).

• [fontBuilder] Added addFeatureVariations method to FontBuilder class. This is a shorthand for calling featureVars.addFeatureVariations on the builder’s TTFont object (#1781).

• [glyf] Fixed the flags bug in glyph.drawPoints() like we did for glyph.draw() (#1771, #1774).

4.2.1 (released 2019-12-06)

• [glyf] Use the flagOnCurve bit mask in glyph.draw(), so that we ignore the overlap flag that may be set when instantiating variable fonts (#1771).

4.2.0 (released 2019-11-28)

• [pens] Added the following pens:

  • roundingPen.RoundingPen: filter pen that rounds coordinates and components’ offsets to integer;

  • roundingPen.RoundingPointPen: like the above, but using PointPen protocol.

  • filterPen.FilterPointPen: base class for filter point pens;

  • transformPen.TransformPointPen: filter point pen to apply affine transform;

  • recordingPen.RecordingPointPen: records and replays point-pen commands.

• [ttGlyphPen] Always round float coordinates and component offsets to integers (#1763).

• [ufoLib] When converting kerning groups from UFO2 to UFO3, avoid confusing groups with the same name as one of the glyphs (#1761, #1762, unified-font-object/ufo-spec#98).

4.1.0 (released 2019-11-18)

• [instancer] Implemented restricting axis ranges (level 3 partial instancing). You can now pass {axis_tag: (min, max)} tuples as input to the instantiateVariableFont function. Note that changing the default axis position is not supported yet. The command-line script also accepts axis ranges in the form of colon-separated float values, e.g. wght=400:700 (#1753, #1537).

• [instancer] Never drop STAT DesignAxis records, but only prune out-of-range AxisValue records.

• [otBase/otTables] Enforce that VarStore.RegionAxisCount == fvar.axisCount, even when regions list is empty to appease OTS < v8.0 (#1752).

• [designspaceLib] Defined new processing attribute for <rules> element, with values “first” or “last”, plus other editorial changes to DesignSpace specification. Bumped format version to 4.1 (#1750).

• [varLib] Improved error message when masters’ glyph orders do not match (#1758, #1759).

• [featureVars] Allow to specify custom feature tag in addFeatureVariations; allow said feature to already exist, in which case we append new lookup indices to existing features. Implemented <rules> attribute processing according to DesignSpace specification update in #1750. Depending on this flag, we generate either an ‘rvrn’ (always processed first) or a ‘rclt’ feature (follows lookup order, therefore last) (#1747, #1625, #1371).

• [ttCollection] Added support for context manager auto-closing via with statement like with TTFont (#1751).

• [unicodedata] Require unicodedata2 >= 12.1.0.

• [py2.py3] Removed yet more PY2 vestiges (#1743).

• [_n_a_m_e] Fixed issue when comparing NameRecords with different string types (#1742).

• [fixedTools] Changed fixedToFloat to not do any rounding but simply return value / (1 << precisionBits). Added floatToFixedToStr and strToFixedToFloat functions to be used when loading from or dumping to XML. Fixed values (e.g. fvar axes and instance coordinates, avar mappings, etc.) are are now stored as un-rounded decimal floats upon decompiling (#1740, #737).

• [feaLib] Fixed handling of multiple LigatureCaret statements for the same glyph. Only the first rule per glyph is used, additional ones are ignored (#1733).

4.0.2 (released 2019-09-26)

• [voltLib] Added support for ALL and NONE in PROCESS_MARKS (#1732).

• [Silf] Fixed issue in Silf table compilation and decompilation regarding str vs bytes in python3 (#1728).

• [merge] Handle duplicate glyph names better: instead of appending font index to all glyph names, use similar code like we use in post and CFF tables (#1729).

4.0.1 (released 2019-09-11)

• [otTables] Support fixing offset overflows in MultipleSubst lookup subtables (#1706).

• [subset] Prune empty strikes in EBDT and CBDT table data (#1698, #1633).

• [pens] Fixed issue in PointToSegmentPen when last point of closed contour has same coordinates as the starting point and was incorrectly dropped (#1720).

• [Graphite] Fixed Sill table output to pass OTS (#1705).

• [name] Added removeNames method to table__n_a_m_e class (#1719).

• [ttLib] Added aliases for renamed entries ascender and descender in hhea table (#1715).

4.0.0 (released 2019-08-22)

• NOTE: The v4.x version series only supports Python 3.6 or greater. You can keep using fonttools 3.x if you need support for Python 2.

• [py23] Removed all the python2-only code since it is no longer reachable, thus unused; only the Python3 symbols were kept, but these are no-op. The module is now DEPRECATED and will removed in the future.

• [ttLib] Fixed UnboundLocalError for empty loca/glyph tables (#1680). Also, allow the glyf table to be incomplete when dumping to XML (#1681).

• [varLib.models] Fixed KeyError while sorting masters and there are no on-axis for a given axis (38a8eb0e).

• [cffLib] Make sure glyph names are unique (#1699).

• [feaLib] Fix feature parser to correctly handle octal numbers (#1700).

... see here for earlier changes