topcoat_font/
tech.rs

1//! Font technologies for the `tech()` hint on a CSS `@font-face` `src`
2//! descriptor.
3
4/// A font technology, as named by the `tech()` hint of a CSS `@font-face`
5/// `src` descriptor.
6///
7/// Displays as the CSS technology keyword used inside `tech(...)`
8/// (`color-colrv1`, `features-opentype`, `variations`, ...).
9#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
10pub enum FontTech {
11    /// Color bitmap data tables, CSS `color-cbdt`.
12    ColorCbdt,
13    /// Multi-colored glyphs via COLR version 0 table, CSS `color-colrv0`.
14    ColorColrV0,
15    /// Multi-colored glyphs via COLR version 1 table, CSS `color-colrv1`.
16    ColorColrV1,
17    /// Standard bitmap graphics tables, CSS `color-sbix`.
18    ColorSbix,
19    /// SVG multi-colored tables, CSS `color-svg`.
20    ColorSvg,
21    /// TrueType `morx` and `kerx` tables, CSS `features-aat`.
22    FeaturesAat,
23    /// Graphite features, namely `Silf`, `Glat`, `Gloc`, `Feat`, and `Sill`
24    /// tables, CSS `features-graphite`.
25    FeaturesGraphite,
26    /// OpenType `GSUB` and `GPOS` tables, CSS `features-opentype`.
27    FeaturesOpenType,
28    /// Incremental font loading, CSS `incremental`.
29    Incremental,
30    /// Font palettes by means of `font-palette` to select one of many color
31    /// palettes in the font, CSS `palettes`.
32    Palettes,
33    /// Font variations in TrueType and OpenType fonts to control the font axis,
34    /// weight, glyphs, etc., CSS `variations`.
35    Variations,
36}
37
38impl FontTech {
39    /// The CSS technology keyword for this technology, as written inside
40    /// `tech(...)`.
41    #[must_use]
42    pub const fn keyword(self) -> &'static str {
43        match self {
44            Self::ColorCbdt => "color-cbdt",
45            Self::ColorColrV0 => "color-colrv0",
46            Self::ColorColrV1 => "color-colrv1",
47            Self::ColorSbix => "color-sbix",
48            Self::ColorSvg => "color-svg",
49            Self::FeaturesAat => "features-aat",
50            Self::FeaturesGraphite => "features-graphite",
51            Self::FeaturesOpenType => "features-opentype",
52            Self::Incremental => "incremental",
53            Self::Palettes => "palettes",
54            Self::Variations => "variations",
55        }
56    }
57
58    /// The technology named by the given CSS `tech(...)` keyword, if the
59    /// keyword names a known technology.
60    #[must_use]
61    pub fn from_keyword(keyword: &str) -> Option<Self> {
62        Some(match keyword {
63            "color-cbdt" => Self::ColorCbdt,
64            "color-colrv0" => Self::ColorColrV0,
65            "color-colrv1" => Self::ColorColrV1,
66            "color-sbix" => Self::ColorSbix,
67            "color-svg" => Self::ColorSvg,
68            "features-aat" => Self::FeaturesAat,
69            "features-graphite" => Self::FeaturesGraphite,
70            "features-opentype" => Self::FeaturesOpenType,
71            "incremental" => Self::Incremental,
72            "palettes" => Self::Palettes,
73            "variations" => Self::Variations,
74            _ => return None,
75        })
76    }
77
78    /// Folds this technology into a running content hash.
79    pub(crate) const fn hash(
80        self,
81        h: topcoat_core::fnv1a::Fnv1a<u64>,
82    ) -> topcoat_core::fnv1a::Fnv1a<u64> {
83        h.write(self.keyword().as_bytes())
84    }
85}
86
87impl std::fmt::Display for FontTech {
88    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
89        f.write_str(self.keyword())
90    }
91}
topcoat_font/tech.rs

topcoat_font/
tech.rs
