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Add initial support for rendering text in the screenshot test driver

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This uses the approach discussed in Mattermost: The compiler understands
a SLINT_DEFAULT_FONT environment variable that can point to a path,
which overrides the fallback font that would otherwise come from the
system (and differ between test systems).
This commit is contained in:
Simon Hausmann 2022-12-22 11:43:18 +01:00 • committed by Simon Hausmann
parent 3c65c6177d
commit c04bc00d34
4 changed files with 84 additions and 2 deletions
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43
internal/compiler/passes/embed_glyphs.rs
View file

@ -32,6 +32,8 @@ pub fn embed_glyphs<'a>(
all_docs: impl Iterator<Item = &'a crate::object_tree::Document> + 'a,
diag: &mut BuildDiagnostics,
) {
use crate::diagnostics::Spanned;
characters_seen.extend(
('a'..='z')
.chain('A'..='Z')
@ -70,6 +72,35 @@ pub fn embed_glyphs<'a>(
fontdb.set_sans_serif_family(default_sans_serif_family);
}
let maybe_override_default_font_id =
std::env::var_os("SLINT_DEFAULT_FONT").and_then(|maybe_font_path| {
let generic_warning_location = component.root_element.borrow().node.as_ref().map(|e| e.to_source_location());
let path = std::path::Path::new(&maybe_font_path);
if path.extension().is_some() {
let face_count = fontdb.len();
match fontdb.load_font_file(path) {
Ok(()) => {
fontdb.faces().get(face_count).map(|face_info| face_info.id)
},
Err(err) => {
diag.push_warning(
format!("Could not load the font set via `SLINT_DEFAULT_FONT`: {}: {}", path.display(), err),
&generic_warning_location,
);
None
},
}
} else {
diag.push_warning(
"The environment variable `SLINT_DEFAULT_FONT` is set, but its value is not referring to a file".into(),
&generic_warning_location,
);
None
}
});
let (fallback_fonts, fallback_font) = get_fallback_fonts(&fontdb);
let mut custom_fonts = Vec::new();
@ -86,7 +117,7 @@ pub fn embed_glyphs<'a>(
}
}
let (default_font_face_id, default_font_path) = {
let (default_font_face_id, default_font_path) = maybe_override_default_font_id.map_or_else(||{
// TODO: improve heuristics in choice of which fonts to embed. use default-font-family, etc.
let (family, source_location) = component
.root_element
@ -124,7 +155,15 @@ pub fn embed_glyphs<'a>(
_ => panic!("internal errormemory fonts are not supported in the compiler"),
},
)
};
}, |override_default_font_id| {
let path = match &fontdb.face(override_default_font_id).unwrap().source {
fontdb::Source::Binary(_) => unreachable!(),
fontdb::Source::File(path_buf) => path_buf.clone(),
fontdb::Source::SharedFile(path_buf, _) => path_buf.clone(),
};
(override_default_font_id, path.to_string_lossy().into())
});
// Map from path to family name
let mut fonts = std::collections::BTreeMap::<String, fontdb::ID>::new();