linebender / linebender/parley

Synthesis SLNT is hardcoded as 14 for the Italic style

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Dominant language
Rust
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Merged PRs (30d)
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Description

When loading a Vairable font like `Monaspace Xenon Var` with the an italic style the Synthesis setting for `SLNT` gets wrongly set to 14.
`StyleProperty::FontStack(FontStack::Source("Monaspace Xenon Var"))`
`StyleProperty::FontStyle(FontStyle::Italic)`

In that particular font the value should be negative, `-11` for the Italic style, and positive values are invalid, so the end result is that the font is rendered as normal instead of slanted and italic.

OS: Linux

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Research direction

Trace how FontStyle::Italic is converted into the SLNT synthesis setting, using the Monaspace Xenon Var example and the provided FontStack and FontStyle values as the reproduction case. Done means the italic style produces the font’s negative SLNT value, such as -11, rather than the invalid positive 14 and renders slanted.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
computer-graphics
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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