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Opentype ItemVariationStore implementation #232

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Opentype ItemVariationStore implementation #232

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archaephyrryx
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Floating feature on top of PR #226 to avoid breaking the overall implementation based on complexities of ItemVariationStore.

@archaephyrryx
Test-fonts folder and Cargo.lock checkin
586a78b
@archaephyrryx
Add prep, gasp to OpenType def and extend API-helper accordingly
d8cc5f5
@archaephyrryx
Update HELPERS.md
2dcfa5e
@archaephyrryx
GDEF spec (ItemVariationStore unimplemented), no API helper support
85e880d
@archaephyrryx
Extract oft_metrics to own file, define and generate Gdef table metri…
82b87f0 
…cs (not yet output)
@archaephyrryx
Finish printing of GDEF metrics
9fc43f2
@archaephyrryx
Implement majority of GPOS and display API
6b628e3
@archaephyrryx
Display fixes for GPOS
abd9ddb
@archaephyrryx
Tweaks to output
e7e6f61
@archaephyrryx
SinglePos subtable in format def and API, add test-font
166247e
@archaephyrryx
Add rustfmt::skip attr to generated module, fmt everything else
ac606fa
@archaephyrryx
Adds PairPos subtable in def and otf_metrics, cleanup, new test-font
317e5c3
@archaephyrryx
CursivePos implementation and API support, new test-font
4483978
@archaephyrryx
Implement GSUB, scaffolding for lookup subtables
b870ff8
@archaephyrryx
Avoid printing default-valued LookupFlag
ab76d45
@archaephyrryx
Partial implementation of SequenceContext subtable
e568f7a
@archaephyrryx
Add type-unification tricks to explicate transitive error-chain
dd4ae42
@archaephyrryx
Fix SOF shift bug in SequenceContext definition
81e885d
@archaephyrryx
ChainedSequenceContexts support, otf_metrics tweaks
bc061e9
@archaephyrryx
Add SingleSubst, refine offset16, refactor helpers and usage patterns
580478f
@archaephyrryx
partial fixes for oft_metrics based on revamped format implementation
020e27b
@archaephyrryx
Fixes overloaded typename for LookupFlag format definition
45cd668
@archaephyrryx
Minor refactor of prepend_field_flags_bits8 in opentype
4ce9e1b
@archaephyrryx
Miscellaneous renamings, refactorings, and doc-changes (spellcheck)
0e0c5e2
@archaephyrryx
Redesign of otf-metrics to handle semi-nullable offset links
f0f1faa
@archaephyrryx
Fixes missing offset-linkage in rule_set.chained_seq_rules
142d97f
@archaephyrryx
AlternateSubst, add guard to avoid underflow for bad offsets
e09dca5
@archaephyrryx
Add --fast flag for fontinfo
279131d
@archaephyrryx
Fix for cmap_subtable_format6 length>65535, minor cleanup
cb3e7c6
@archaephyrryx
Fix bad SOF-offset for table-dirs in TTC, rename sample_codegen
61840eb
@archaephyrryx
Fix otf_metrics based on breaking changes to opentype.rs
739fd16
@archaephyrryx
Add quick comment to explain TraitSet::Copy
aae5df6
@archaephyrryx
fontinfo verbosity, derive builder, doodle --as-format flag
98c2b5a
@archaephyrryx
Reverts red-herring anti-fix to 'start of font' offset interpretation
423178b
@archaephyrryx
Adds base address parameter to WithRelativeOffset, -q flag in fontinfo
4816aec
@archaephyrryx
Adds frankenpax TTC font to test-fonts directory
9ce9e4f
@archaephyrryx
Relax assertion that MultipleSubst glyphCount != 0
a05547d
@archaephyrryx
Handle non-standard delta-values, refactor UintSet
a2adb31
@archaephyrryx
Allow OpenType fonts to have TrueType-specific "true" sfntVersion
7e7dcbb
@archaephyrryx
LigatureSubst support, CoverageTable iteration
854a0f0
@archaephyrryx
ReverseChainContextSingleSubst support
ae955e6
@archaephyrryx
Groundwork FormatRefs to facilitate writing Pos/Subst Extension
57cba4c
@archaephyrryx
Implementation of MarkBase and MarkLig Pos subtables (broken on one f…
5c24d7d 
…ont)
@archaephyrryx
Fixed MarkLigPos, partial impl (Format layer only) for MarkMarkPos
e22d14c
@archaephyrryx
Full implementation of MarkMarkPos
d75ed2c
@archaephyrryx
Support for layout extension subtables
1888a1f
@archaephyrryx
Inherit extension lookup type for LookupTable lookup_type field value
a1f9827
@archaephyrryx
Add Format layer for v1.1 layout table fields, test font for FeatureV…
753e79a 
…ariations
@archaephyrryx
Implementation and partial API for Base table
010a886
@archaephyrryx
ItemVariationStore stub implementation
e5b5a31
@archaephyrryx
Prototype implementation for ItemVariationStore
71df976
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@archaephyrryx