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LibWeb/CSS: Add functions that report font format/technology support

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Both `@supports` and `@font-face` need this. There may be some automatic
way of querying whether our renderer supports these, but I couldn't
figure it out, so here's a basic hard-coded list. I think the font-tech
list has false negatives, as I don't know enough about fonts to
determine what we support accurately.
This commit is contained in:
Sam Atkins
2025-03-14 11:32:05 +00:00
parent 1e6f703b30
commit adfe8a9dcb
Notes: github-actions[bot] 2025-03-17 10:01:24 +00:00 
Author: https://github.com/AtkinsSJ
Commit: https://github.com/LadybirdBrowser/ladybird/commit/adfe8a9dcbb
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3941
2 changed files with 56 additions and 0 deletions
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53
Libraries/LibWeb/CSS/FontFace.cpp
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@@ -398,4 +398,57 @@ GC::Ref<WebIDL::Promise> FontFace::load()
return font_face.loaded();
}
bool font_format_is_supported(FlyString const& name)
{
// https://drafts.csswg.org/css-fonts-4/#font-format-definitions
// FIXME: Determine this automatically somehow?
if (name.equals_ignoring_ascii_case("collection"sv))
return false;
if (name.equals_ignoring_ascii_case("embedded-opentype"sv))
return false;
if (name.equals_ignoring_ascii_case("opentype"sv))
return true;
if (name.equals_ignoring_ascii_case("svg"sv))
return false;
if (name.equals_ignoring_ascii_case("truetype"sv))
return true;
if (name.equals_ignoring_ascii_case("woff"sv))
return true;
if (name.equals_ignoring_ascii_case("woff2"sv))
return true;
return false;
}
bool font_tech_is_supported(FlyString const& name)
{
// https://drafts.csswg.org/css-fonts-4/#font-tech-definitions
// FIXME: Determine this automatically somehow?
if (name.equals_ignoring_ascii_case("features-opentype"sv))
return true;
if (name.equals_ignoring_ascii_case("features-aat"sv))
return false;
if (name.equals_ignoring_ascii_case("features-graphite"sv))
return false;
if (name.equals_ignoring_ascii_case("variations"sv))
return true;
if (name.equals_ignoring_ascii_case("color-colrv0"sv))
return true;
if (name.equals_ignoring_ascii_case("color-colrv1"sv))
return true;
if (name.equals_ignoring_ascii_case("color-svg"sv))
return false;
if (name.equals_ignoring_ascii_case("color-sbix"sv))
return false;
if (name.equals_ignoring_ascii_case("color-cbdt"sv))
return false;
if (name.equals_ignoring_ascii_case("palettes"sv))
return false;
if (name.equals_ignoring_ascii_case("incremental"sv))
return false;
// https://drafts.csswg.org/css-fonts-5/#font-tech-definitions
if (name.equals_ignoring_ascii_case("avar2"sv))
return false;
return false;
}
}