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bflatastic
f77d9a467e
Measured against documents re-saved by other software. A line's height is rounded to whole pixels (halves up) with the baseline keeping its fraction inside it; a glyph's advance and its kerning are each rounded to 1/1024 em before scaling; a line's width and wrapping leave out the letter spacing after its last visible glyph. Rule tests on built-in fonts, a local-only check over such documents, and three behaviour expectations updated to the new rules.
39 lines
2.3 KiB
Rust
39 lines
2.3 KiB
Rust
//! Text box sizes measured against documents re-saved by other software. Local only: runs when
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//! `FIGCRAFT_FIG_SAMPLES` names a folder of `.fig` files, and only for text whose exact font is
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//! installed. The rules themselves are tested on built-in fonts in `figcraft_text`.
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use figcraft_doc::{LineHeight, Node, NodeKind, TextAutoResize};
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/// `n` with its percent line height read as a share of the font's own line height (the import
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/// reads every percent as a share of the font size; files can mean either).
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fn of_own_line_height(n: &Node) -> Option<Node> {
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let mut m = n.clone();
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let NodeKind::Text(t) = &mut m.kind else { return None };
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let LineHeight::Percent(p) = t.style.line_height else { return None };
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let f = figcraft_text::find_face(&t.style.font_family, &t.style.font_style)?;
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t.style.line_height = LineHeight::Percent(p * (f.ascent + f.descent + f.line_gap.max(0.0)) / f.upem);
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Some(m)
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}
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/// Each text box that sizes itself comes out at the size stored in the file, to the pixel.
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#[test]
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fn local_samples_keep_their_text_box_sizes() {
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let Some(dir) = std::env::var_os("FIGCRAFT_FIG_SAMPLES") else { return };
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let Ok(dir) = std::fs::read_dir(dir) else { return };
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figcraft_text::scan_system_fonts();
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for p in dir.flatten().map(|e| e.path()).filter(|p| p.extension().is_some_and(|x| x == "fig")) {
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let Ok((doc, _)) = figcraft_format::fig::import(&std::fs::read(&p).unwrap(), "sample") else { continue };
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for n in doc.nodes() {
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let NodeKind::Text(t) = &n.kind else { continue };
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// Stored sizes are whole pixels once the text was laid out by the software that saved it.
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let laid_out = n.height.fract() == 0.0 && (t.auto_resize != TextAutoResize::WidthAndHeight || n.width.fract() == 0.0);
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let own_font = t.spans().iter().all(|(_, _, s)| {
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figcraft_text::find_face(&s.font_family, &s.font_style).is_some_and(|f| f.family == s.font_family && f.style == s.font_style)
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});
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let Some((w, h)) = figcraft_text::auto_size(n).filter(|_| laid_out && own_font) else { continue };
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let h = if h == n.height { h } else { of_own_line_height(n).and_then(|m| figcraft_text::auto_size(&m)).map_or(h, |s| s.1) };
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assert_eq!((w, h), (n.width, n.height), "{}: {:?}", p.display(), t.characters);
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}
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}
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}
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