Add identity mapping fallback for custom axes#2001
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Fonts with custom axes (e.g. YEAR) can have instances that lack "Axis Location" custom parameters. Previously, these instances contributed no mapping entry, causing a MissingMappingForDesignCoord crash. This adds a fallback for non-wght/wdth axes: if no Axis Location CP is present, use an identity mapping (user = design), matching glyphsLib's AxisDefinition.get_user_loc() behavior. Fixes crash on dancoull/ClimateCrisis.
dfrg
approved these changes
May 3, 2026
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Fonts with custom axes (e.g. YEAR) can have instances that lack "Axis Location" custom parameters. Previously, these instances contributed no mapping entry, causing a MissingMappingForDesignCoord crash. This adds a fallback for non-wght/wdth axes: if no Axis Location CP is present, use an identity mapping (user = design), matching glyphsLib's AxisDefinition.get_user_loc() behavior.
Fixes crash on dancoull/ClimateCrisis.