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review(#1629): one direction mark, no dead RTL paragraph path, tests follow the new layout

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- One visible-named LRM constant (ttf_glyph) instead of two invisible
  literals. Stroke and SDF text skip it, so a right-to-left script the
  shaper does not handle no longer gets a 6-unit gap per mark; vertical
  MTEXT does not insert it at all.
- Shaped cells keep a cluster the shaper merged into the leading mark.
- The always-false RTL paragraph flag, its indent/anchor branches and the
  unused reorder_line_atoms are gone; its test now covers reorder_rtl_runs.
- Underline, overline and strike follow each drawn run of a mixed word.
- Justify/distribute count only the gaps the measured width holds.
- The two RTL alignment tests assert the new left-to-right behaviour;
  glyph_boxes keeps its own doc comment.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Hakan SevenandClaude Opus 5.5 committed 2026-10-06 20:49:01 +03:00
1 parent 36871044a6
commit 864c644222
5 files changed
+99 -242
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src/entities/mtext.rs
+3 -4
View File
@@ -79,10 +79,6 @@ fn drawing_dir_str(d: &DrawingDirection) -> &'static str {
}
}
/// Per-visible-character world-space boxes for the MText editor's
/// click-to-select preview. Uses the exact same layout opts as `to_render`
/// so the boxes line up with the rendered glyphs.
/// The text MTEXT lays out: its stored value, except that the spaces between
/// a field's value and a right-to-left word right after it read with that
/// word — the reference draws `שלום 0 עולם` with no gap after the field
@@ -111,6 +107,9 @@ fn display_text(t: &MText, document: &codec::CadDocument) -> String {
out
}
/// Per-visible-character world-space boxes for the MText editor's
/// click-to-select preview. Uses the exact same layout opts as `to_render`
/// so the boxes line up with the rendered glyphs.
pub fn glyph_boxes(t: &MText, document: &codec::CadDocument) -> Vec<GlyphBox> {
let resolved_style = resolve_text_style(&t.style, document);
let attach_h_anchor: f32 = match t.attachment_point {
src/entities/text.rs
+7 -3
View File
@@ -705,9 +705,13 @@ mod tests {
let doc = codec::CadDocument::default();
let placement = text_run_placement_at_scale(&t, &doc, 1.0);
// For Arabic text with default HA::Left, origin should be shifted left
// so the right edge of the text sits at the insertion point (X = 10.0).
assert!(placement.origin[0] < 10.0, "Arabic text origin must be to the left of insertion point: origin_x={}", placement.origin[0]);
// Left alignment does not depend on the script: Arabic text starts
// at the insertion point like any other.
assert!(
(placement.origin[0] - 10.0).abs() < 1e-9,
"Left-aligned Arabic text starts at the insertion point: origin_x={}",
placement.origin[0]
);
}
}
src/entities/text_support.rs
+71 -225
View File
@@ -864,12 +864,9 @@ pub fn is_rtl_char(c: char) -> bool {
)
}
/// Reorder a line's atoms into visual order (left to right) using the Unicode
/// Bidirectional Algorithm (UBA) Rule L2. If the line contains no RTL characters
/// and is not an RTL paragraph, returns the atoms unchanged.
/// Left-to-right mark: keeps the shaper's paragraph direction left to right
/// and closes a right-to-left run inside a word.
pub(crate) const LRM: char = '‎';
pub(crate) use crate::scene::text::ttf_glyph::LRM;
/// Whether a word is written right to left as a whole: right-to-left
/// letters (and their marks) only.
@@ -934,113 +931,6 @@ pub fn reorder_rtl_runs(atoms: Vec<LayoutAtom>) -> Vec<LayoutAtom> {
atoms
}
pub fn reorder_line_atoms(atoms: Vec<LayoutAtom>, is_rtl: bool) -> Vec<LayoutAtom> {
if atoms.len() <= 1 && !is_rtl {
return atoms;
}
let has_rtl = atoms.iter().any(|atom| match &atom.kind {
AtomKind::Word(w) => w.chars().any(is_rtl_char),
_ => false,
});
if !has_rtl && !is_rtl {
return atoms;
}
let mut line_text = String::new();
let mut ranges = Vec::with_capacity(atoms.len());
for atom in &atoms {
let start = line_text.len();
match &atom.kind {
AtomKind::Word(w) => line_text.push_str(w),
AtomKind::Space => line_text.push(' '),
AtomKind::Tab => line_text.push('\t'),
AtomKind::Stack { numerator, denominator, .. } => {
line_text.push_str(numerator);
line_text.push('/');
line_text.push_str(denominator);
}
}
let end = line_text.len();
ranges.push(start..end);
}
let base_level = if is_rtl {
Some(unicode_bidi::Level::rtl())
} else {
Some(unicode_bidi::Level::ltr())
};
let bidi = unicode_bidi::BidiInfo::new(&line_text, base_level);
if bidi.paragraphs.is_empty() {
return atoms;
}
let atom_levels: Vec<u8> = ranges
.iter()
.map(|r| {
let mut lvl = None;
// `bidi.levels` is indexed by byte, so walk characters rather than
// bytes to avoid slicing inside a multi-byte character.
for (offset, c) in line_text[r.clone()].char_indices() {
let i = r.start + offset;
if i < bidi.levels.len() {
match unicode_bidi::bidi_class(c) {
unicode_bidi::BidiClass::L
| unicode_bidi::BidiClass::R
| unicode_bidi::BidiClass::AL => {
lvl = Some(bidi.levels[i].number());
break;
}
_ => {}
}
}
}
lvl.unwrap_or_else(|| {
if r.start < bidi.levels.len() {
bidi.levels[r.start].number()
} else if is_rtl {
1
} else {
0
}
})
})
.collect();
let max_level = atom_levels.iter().copied().max().unwrap_or(0);
let min_odd_level = atom_levels
.iter()
.copied()
.filter(|&l| l % 2 != 0)
.min()
.unwrap_or(1);
let mut order: Vec<usize> = (0..atoms.len()).collect();
for level in (min_odd_level..=max_level).rev() {
let mut start = 0;
while start < order.len() {
if atom_levels[order[start]] >= level {
let mut end = start + 1;
while end < order.len() && atom_levels[order[end]] >= level {
end += 1;
}
order[start..end].reverse();
start = end;
} else {
start += 1;
}
}
}
let mut opt_atoms: Vec<Option<LayoutAtom>> = atoms.into_iter().map(Some).collect();
let mut reordered = Vec::with_capacity(opt_atoms.len());
for idx in order {
if let Some(atom) = opt_atoms[idx].take() {
reordered.push(atom);
}
}
reordered
}
pub fn run_scale(state: &RunState, entity_h: f32, base_wf: f32) -> f32 {
(state.height_mul * entity_h / 9.0) * (state.width_mul * base_wf.abs())
}
@@ -1117,7 +1007,9 @@ fn run_family(face: &Face) -> &str {
/// Advance of a stroke-font run (glyph units × `scale`).
fn stroke_run_width(face: &Face, text: &str, tracking: f32, scale: f32) -> f32 {
// The direction mark takes no room.
text.chars()
.filter(|ch| *ch != LRM)
.map(|ch| match face.glyph(ch) {
Some(g) => (g.advance + face.spacing_after(ch) * tracking) * scale,
None => (6.0 + face.letter_spacing() * tracking) * scale,
@@ -1620,6 +1512,14 @@ pub struct MTextLayout {
/// (text frame, background fill, low-detail LOD substitutes) around the
/// text block.
pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
// Vertical text stacks characters one per cell and has no runs to turn.
let display_word = |word: String| {
if opts.vertical_text {
word
} else {
rtl_display_word(word)
}
};
let base_font_name = opts.style.font_name.clone();
let base_font = Face::resolve(&base_font_name);
let base_wf_abs = opts.style.width_factor.max(0.01);
@@ -1637,7 +1537,6 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
struct SubLine {
atoms: Vec<LayoutAtom>,
align: Option<ParagraphAlign>,
is_rtl: bool,
indent_first: f32,
indent_left: f32,
indent_right: f32,
@@ -1686,7 +1585,7 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
} else if ch == ' ' || ch == '\t' {
if !word.is_empty() {
atoms.push(LayoutAtom {
kind: AtomKind::Word(rtl_display_word(std::mem::take(&mut word))),
kind: AtomKind::Word(display_word(std::mem::take(&mut word))),
state: run.state.clone(),
char_offset: word_start,
});
@@ -1714,7 +1613,7 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
if let Some(prev) = word.chars().last() {
if cjk_break_between(prev, ch) {
atoms.push(LayoutAtom {
kind: AtomKind::Word(rtl_display_word(std::mem::take(&mut word))),
kind: AtomKind::Word(display_word(std::mem::take(&mut word))),
state: run.state.clone(),
char_offset: word_start,
});
@@ -1727,7 +1626,7 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
}
if !word.is_empty() {
atoms.push(LayoutAtom {
kind: AtomKind::Word(rtl_display_word(word)),
kind: AtomKind::Word(display_word(word)),
state: run.state.clone(),
char_offset: word_start,
});
@@ -1780,7 +1679,6 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
// one that starts with Hebrew or Arabic: alignment follows the
// attachment, and only right-to-left runs read backwards in place
// (`reorder_rtl_runs`).
let is_rtl_para = false;
// Wrap to the column the text actually flows down, not to the block:
// measuring against the full width would let a line run across the
@@ -1815,7 +1713,6 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
sub_lines.push(SubLine {
atoms,
align: para.align,
is_rtl: is_rtl_para,
indent_first: para.indent_first,
indent_left: para.indent_left,
indent_right: para.indent_right,
@@ -1839,7 +1736,6 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
sub_lines.push(SubLine {
atoms: Vec::new(),
align: None,
is_rtl: false,
indent_first: 0.0,
indent_left: 0.0,
indent_right: 0.0,
@@ -2215,9 +2111,7 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
let content_left = if rect_w > 0.0 {
box_left
+ if sub.is_rtl {
sub.indent_right
} else if sub.is_first_in_paragraph {
+ if sub.is_first_in_paragraph {
sub.indent_first
} else {
sub.indent_left
@@ -2226,16 +2120,7 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
0.0
};
let content_right = if rect_w > 0.0 {
box_left + rect_w
- if sub.is_rtl {
if sub.is_first_in_paragraph {
sub.indent_first
} else {
sub.indent_left
}
} else {
sub.indent_right
}
box_left + rect_w - sub.indent_right
} else {
0.0
};
@@ -2246,13 +2131,7 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
| Some(ParagraphAlign::Distribute) => 0.0,
Some(ParagraphAlign::Center) => 0.5,
Some(ParagraphAlign::Right) => 1.0,
None => {
if sub.is_rtl {
1.0
} else {
attach_h_anchor
}
}
None => attach_h_anchor,
};
let visible_atoms = sub
@@ -2308,7 +2187,7 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
xmax: ax,
ymin: ay.min(by),
ymax: ay.max(by),
is_rtl: sub.is_rtl,
is_rtl: false,
local: [line_lx + cursor_start, line_ly, line_lx + cursor_start, line_ly + caret_h],
});
vis += 1;
@@ -2328,17 +2207,17 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
let distribute = matches!(sub.align, Some(ParagraphAlign::Distribute));
let slack = (content_right - content_left).max(0.0) - line_w;
if rect_w > 0.0 && (justify || distribute) && slack > 1e-6 {
let spaces = sub
.atoms
// The gaps the measured width holds: none after the last
// visible atom, and no direction marks.
let spaces = sub.atoms[..visible_atoms]
.iter()
.filter(|a| matches!(a.kind, AtomKind::Space))
.count();
if distribute {
let chars: usize = sub
.atoms
let chars: usize = sub.atoms[..visible_atoms]
.iter()
.filter_map(|a| match &a.kind {
AtomKind::Word(t) => Some(t.chars().count()),
AtomKind::Word(t) => Some(t.chars().filter(|c| *c != LRM).count()),
_ => None,
})
.sum();
@@ -2501,47 +2380,40 @@ pub fn layout_mtext(opts: &MTextRenderOpts) -> MTextLayout {
bold: atom.state.bold,
}),
});
run_x += run_width(&face, run_text, shaped, tracking, run_scale_x);
}
// Underline / overline / strike are lines, not glyphs; a
// run-group's strokes are suppressed by the SDF path, so
// emit the decorations in their own RUN-LESS group. Reuse
// lff's exact positions by tessellating the decorated word
// and taking the strokes it appends after the glyphs.
if atom.state.underline || atom.state.overline || atom.state.strike {
let glyph_n = lff::tessellate_text_run(
[0.0, 0.0],
run_h,
rot,
signed_wf,
oblique,
tracking,
&font_name,
text,
)
.0
.len();
let body = decorated(text, &atom.state);
let (deco, _) = lff::tessellate_text_run(
[0.0, 0.0],
run_h,
rot,
signed_wf,
oblique,
tracking,
&font_name,
&body,
);
if deco.len() > glyph_n {
all_strokes.push(TextStroke {
strokes: deco[glyph_n..].to_vec(),
origin,
color,
fill_tris: vec![],
plane: None,
run: None,
});
// Underline / overline / strike are lines, not glyphs;
// a run-group's strokes are suppressed by the SDF path,
// so emit the decorations in their own RUN-LESS group,
// run by run so they span what is drawn. Reuse lff's
// exact positions by tessellating the decorated run and
// taking the strokes it appends after the glyphs.
if atom.state.underline || atom.state.overline || atom.state.strike {
let tessellate = |body: &str| {
lff::tessellate_text_run(
[0.0, 0.0],
run_h,
rot,
signed_wf,
oblique,
tracking,
&font_name,
body,
)
.0
};
let glyph_n = tessellate(run_text).len();
let deco = tessellate(&decorated(run_text, &atom.state));
if deco.len() > glyph_n {
all_strokes.push(TextStroke {
strokes: deco[glyph_n..].to_vec(),
origin: [origin[0] + dx as f64, origin[1] + dy as f64],
color,
fill_tris: vec![],
plane: None,
run: None,
});
}
}
run_x += run_width(&face, run_text, shaped, tracking, run_scale_x);
}
if opts.want_glyph_boxes {
let run_h = atom.state.height_mul * entity_h;
@@ -3279,8 +3151,8 @@ mod v_anchor_tests {
}
#[test]
fn test_bidi_atoms() {
fn reorder_atoms(words: &[&str], is_rtl: bool) -> Vec<String> {
fn right_to_left_runs_read_backwards_in_place() {
fn reorder(words: &[&str]) -> Vec<String> {
let atoms: Vec<super::LayoutAtom> = words
.iter()
.map(|w| super::LayoutAtom {
@@ -3293,8 +3165,7 @@ mod v_anchor_tests {
char_offset: 0,
})
.collect();
let reordered = super::reorder_line_atoms(atoms, is_rtl);
reordered
super::reorder_rtl_runs(atoms)
.into_iter()
.map(|a| match a.kind {
super::AtomKind::Word(w) => w,
@@ -3304,43 +3175,17 @@ mod v_anchor_tests {
.collect()
}
// Case 1: Pure Arabic
let words1 = ["بسم", " ", "الله", " ", "الرحمن", " ", "الرحيم"];
let reordered1 = reorder_atoms(&words1, true);
assert_eq!(reordered1, vec!["الرحيم", " ", "الرحمن", " ", "الله", " ", "بسم"]);
// Case 2: Arabic with numbers
let words2 = ["بسم", " ", "الله", " ", "123", " ", "الرحمن"];
let reordered2 = reorder_atoms(&words2, true);
assert_eq!(reordered2, vec!["الرحمن", " ", "123", " ", "الله", " ", "بسم"]);
// Case 3: English with Arabic
let words3 = ["Hello", " ", "بسم", " ", "الله", " ", "world"];
let reordered3 = reorder_atoms(&words3, false);
assert_eq!(reordered3, vec!["Hello", " ", "الله", " ", "بسم", " ", "world"]);
// Case 4: Pure English
let words4 = ["Hello", " ", "world"];
let reordered4 = reorder_atoms(&words4, false);
assert_eq!(reordered4, vec!["Hello", " ", "world"]);
// Case 5: Mixed Urdu + Arabic + Hebrew + English
let text_b = "یہ اردو ہے۔ مرحبا! שלום שנה 2026 is here!";
let words_b: Vec<&str> = text_b.split_inclusive(' ').collect();
let reordered_b = reorder_atoms(&words_b, true);
// A run of right-to-left words turns round with the spaces after it;
// everything else keeps its order.
assert_eq!(
reordered_b,
vec!["2026 ", "is ", "here!", "שנה ", "שלום ", "مرحبا! ", "ہے۔ ", "اردو ", "یہ "]
reorder(&["אבג", " ", "דה", " ", "abc"]),
vec![" ", "דה", " ", "אבג", "abc"]
);
// Case 6: a word starting with multi-byte neutral punctuation must
// not be sliced inside that character.
let words6 = ["שלום", " ", "«x"];
let reordered6 = reorder_atoms(&words6, false);
assert_eq!(reordered6, vec!["שלום", " ", "«x"]);
assert_eq!(reorder(&["Hello", " ", "world"]), vec!["Hello", " ", "world"]);
// A word starting with multi-byte punctuation ends the run whole.
assert_eq!(reorder(&["שלום", " ", "«x"]), vec![" ", "שלום", "«x"]);
}
#[test]
fn cjk_paragraph_wraps_between_ideographs() {
use crate::entities::text_support::{layout_mtext, MTextRenderOpts, MTextVAnchor, ResolvedTextStyle};
@@ -3460,10 +3305,11 @@ mod v_anchor_tests {
};
let layout_mixed = layout_mtext(&opts_mixed);
assert!(!layout_mixed.strokes.is_empty());
// In a wrapped box of width 200.0, RTL paragraph right-aligns:
// the rightmost stroke group should end near 200.0
let max_origin = layout_mixed.strokes.iter().map(|s| s.origin[0]).fold(f64::NEG_INFINITY, f64::max);
assert!(max_origin > 100.0, "RTL text in 200-width box should be right-aligned near the right margin (got max_origin={})", max_origin);
// A paragraph starting with right-to-left text still follows the
// attachment: left-anchored in a 200-wide box, it starts at the left.
let min_origin = layout_mixed.strokes.iter().map(|s| s.origin[0]).fold(f64::INFINITY, f64::min);
// (The space after the turned run leads, as the reference shows it.)
assert!(min_origin < 5.0, "a left-anchored paragraph starts at the left margin (got min_origin={min_origin})");
// Test single Arabic word "ميل"
let opts_mayl = MTextRenderOpts {
src/scene/text/lff.rs
+4
View File
@@ -338,6 +338,10 @@ pub(crate) fn tokenize_run(text: &str) -> Vec<Tok> {
let mut toks = Vec::new();
let mut chars = text.chars().peekable();
while let Some(ch) = chars.next() {
// A direction mark only steers shaping; it draws nothing.
if ch == crate::scene::text::ttf_glyph::LRM {
continue;
}
if ch == '\\' {
match chars.peek().copied() {
Some('L') => {
src/scene/text/ttf_glyph.rs
+14 -10
View File
@@ -603,8 +603,9 @@ pub fn char_cells(run: &ShapedRun, text: &str) -> Vec<(f32, f32)> {
.collect()
}
/// Left-to-right mark shaped ahead of every run.
const BASE_MARK: char = '‎';
/// Left-to-right mark, shaped ahead of every run so its base direction is
/// left to right; layout also uses it to close a right-to-left run.
pub(crate) const LRM: char = '\u{200E}';
type ShapeCache = HashMap<(String, String), Option<Arc<ShapedRun>>>;
@@ -907,7 +908,7 @@ fn build_shaped(_family: &str, text: &str) -> Option<ShapedRun> {
// A leading left-to-right mark keeps the paragraph direction left to
// right, as the reference lays text out (right-to-left runs still read
// backwards); `cells` stay relative to `text`.
let marked = format!("{BASE_MARK}{text}");
let marked = format!("{LRM}{text}");
buffer.set_text(&mut font_system, &marked, &attrs, Shaping::Advanced, None);
buffer.shape_until_scroll(&mut font_system, false);
@@ -917,9 +918,11 @@ fn build_shaped(_family: &str, text: &str) -> Option<ShapedRun> {
for run in buffer.layout_runs() {
advance = advance.max(run.line_w * px_to_9);
for glyph in run.glyphs.iter() {
if glyph.start >= BASE_MARK.len_utf8() {
let m = BASE_MARK.len_utf8();
cells.push((glyph.start - m, glyph.end - m, glyph.x * px_to_9, (glyph.x + glyph.w) * px_to_9));
// A cluster the shaper merged into the mark keeps its own part.
let m = LRM.len_utf8();
if glyph.end > m {
let start = glyph.start.saturating_sub(m);
cells.push((start, glyph.end - m, glyph.x * px_to_9, (glyph.x + glyph.w) * px_to_9));
}
let face_index = font_system
.db_mut()
@@ -991,7 +994,7 @@ fn build_shaped(family: &str, text: &str) -> Option<ShapedRun> {
// A leading left-to-right mark keeps the paragraph direction left to
// right, as the reference lays text out (right-to-left runs still read
// backwards); `cells` stay relative to `text`.
let marked = format!("{BASE_MARK}{text}");
let marked = format!("{LRM}{text}");
buf.set_text(&mut fs, &marked, &attrs, Shaping::Advanced, None);
buf.shape_until_scroll(&mut fs, false);
@@ -1031,9 +1034,10 @@ fn build_shaped(family: &str, text: &str) -> Option<ShapedRun> {
for run in buf.layout_runs() {
advance = advance.max(run.line_w * px_to_9);
for g in run.glyphs.iter() {
if g.start >= BASE_MARK.len_utf8() {
let m = BASE_MARK.len_utf8();
cells.push((g.start - m, g.end - m, g.x * px_to_9, (g.x + g.w) * px_to_9));
// A cluster the shaper merged into the mark keeps its own part.
let m = LRM.len_utf8();
if g.end > m {
cells.push((g.start.saturating_sub(m), g.end - m, g.x * px_to_9, (g.x + g.w) * px_to_9));
}
let face_index = fs.db_mut().face(g.font_id).map(|f| f.index).unwrap_or(0);
let Some(font) = fs.get_font(g.font_id, g.font_weight) else {