1use crate::{
2 color::Color,
3 fonts::{FontId, GlyphId, Underline},
4 geometry::{
5 rect::RectF,
6 vector::{vec2f, Vector2F},
7 },
8 platform,
9 platform::FontSystem,
10 scene,
11 window::WindowContext,
12 SceneBuilder,
13};
14use ordered_float::OrderedFloat;
15use parking_lot::{Mutex, RwLock, RwLockUpgradableReadGuard};
16use smallvec::SmallVec;
17use std::{
18 borrow::Borrow,
19 collections::HashMap,
20 hash::{Hash, Hasher},
21 iter,
22 sync::Arc,
23};
24
25pub struct TextLayoutCache {
26 prev_frame: Mutex<HashMap<CacheKeyValue, Arc<LineLayout>>>,
27 curr_frame: RwLock<HashMap<CacheKeyValue, Arc<LineLayout>>>,
28 fonts: Arc<dyn platform::FontSystem>,
29}
30
31#[derive(Copy, Clone, Debug, PartialEq, Eq)]
32pub struct RunStyle {
33 pub color: Color,
34 pub font_id: FontId,
35 pub underline: Underline,
36}
37
38impl TextLayoutCache {
39 pub fn new(fonts: Arc<dyn platform::FontSystem>) -> Self {
40 Self {
41 prev_frame: Mutex::new(HashMap::new()),
42 curr_frame: RwLock::new(HashMap::new()),
43 fonts,
44 }
45 }
46
47 pub fn finish_frame(&self) {
48 let mut prev_frame = self.prev_frame.lock();
49 let mut curr_frame = self.curr_frame.write();
50 std::mem::swap(&mut *prev_frame, &mut *curr_frame);
51 curr_frame.clear();
52 }
53
54 pub fn layout_str<'a>(
55 &'a self,
56 text: &'a str,
57 font_size: f32,
58 runs: &'a [(usize, RunStyle)],
59 ) -> Line {
60 let key = &CacheKeyRef {
61 text,
62 font_size: OrderedFloat(font_size),
63 runs,
64 } as &dyn CacheKey;
65 let curr_frame = self.curr_frame.upgradable_read();
66 if let Some(layout) = curr_frame.get(key) {
67 return Line::new(layout.clone(), runs);
68 }
69
70 let mut curr_frame = RwLockUpgradableReadGuard::upgrade(curr_frame);
71 if let Some((key, layout)) = self.prev_frame.lock().remove_entry(key) {
72 curr_frame.insert(key, layout.clone());
73 Line::new(layout, runs)
74 } else {
75 let layout = Arc::new(self.fonts.layout_line(text, font_size, runs));
76 let key = CacheKeyValue {
77 text: text.into(),
78 font_size: OrderedFloat(font_size),
79 runs: SmallVec::from(runs),
80 };
81 curr_frame.insert(key, layout.clone());
82 Line::new(layout, runs)
83 }
84 }
85}
86
87trait CacheKey {
88 fn key(&self) -> CacheKeyRef;
89}
90
91impl<'a> PartialEq for (dyn CacheKey + 'a) {
92 fn eq(&self, other: &dyn CacheKey) -> bool {
93 self.key() == other.key()
94 }
95}
96
97impl<'a> Eq for (dyn CacheKey + 'a) {}
98
99impl<'a> Hash for (dyn CacheKey + 'a) {
100 fn hash<H: Hasher>(&self, state: &mut H) {
101 self.key().hash(state)
102 }
103}
104
105#[derive(Eq)]
106struct CacheKeyValue {
107 text: String,
108 font_size: OrderedFloat<f32>,
109 runs: SmallVec<[(usize, RunStyle); 1]>,
110}
111
112impl CacheKey for CacheKeyValue {
113 fn key(&self) -> CacheKeyRef {
114 CacheKeyRef {
115 text: self.text.as_str(),
116 font_size: self.font_size,
117 runs: self.runs.as_slice(),
118 }
119 }
120}
121
122impl PartialEq for CacheKeyValue {
123 fn eq(&self, other: &Self) -> bool {
124 self.key().eq(&other.key())
125 }
126}
127
128impl Hash for CacheKeyValue {
129 fn hash<H: Hasher>(&self, state: &mut H) {
130 self.key().hash(state);
131 }
132}
133
134impl<'a> Borrow<dyn CacheKey + 'a> for CacheKeyValue {
135 fn borrow(&self) -> &(dyn CacheKey + 'a) {
136 self as &dyn CacheKey
137 }
138}
139
140#[derive(Copy, Clone)]
141struct CacheKeyRef<'a> {
142 text: &'a str,
143 font_size: OrderedFloat<f32>,
144 runs: &'a [(usize, RunStyle)],
145}
146
147impl<'a> CacheKey for CacheKeyRef<'a> {
148 fn key(&self) -> CacheKeyRef {
149 *self
150 }
151}
152
153impl<'a> PartialEq for CacheKeyRef<'a> {
154 fn eq(&self, other: &Self) -> bool {
155 self.text == other.text
156 && self.font_size == other.font_size
157 && self.runs.len() == other.runs.len()
158 && self.runs.iter().zip(other.runs.iter()).all(
159 |((len_a, style_a), (len_b, style_b))| {
160 len_a == len_b && style_a.font_id == style_b.font_id
161 },
162 )
163 }
164}
165
166impl<'a> Hash for CacheKeyRef<'a> {
167 fn hash<H: Hasher>(&self, state: &mut H) {
168 self.text.hash(state);
169 self.font_size.hash(state);
170 for (len, style_id) in self.runs {
171 len.hash(state);
172 style_id.font_id.hash(state);
173 }
174 }
175}
176
177#[derive(Default, Debug, Clone)]
178pub struct Line {
179 layout: Arc<LineLayout>,
180 style_runs: SmallVec<[StyleRun; 32]>,
181}
182
183#[derive(Debug, Clone, Copy)]
184struct StyleRun {
185 len: u32,
186 color: Color,
187 underline: Underline,
188}
189
190#[derive(Default, Debug)]
191pub struct LineLayout {
192 pub width: f32,
193 pub ascent: f32,
194 pub descent: f32,
195 pub runs: Vec<Run>,
196 pub len: usize,
197 pub font_size: f32,
198}
199
200#[derive(Debug)]
201pub struct Run {
202 pub font_id: FontId,
203 pub glyphs: Vec<Glyph>,
204}
205
206#[derive(Clone, Debug)]
207pub struct Glyph {
208 pub id: GlyphId,
209 pub position: Vector2F,
210 pub index: usize,
211 pub is_emoji: bool,
212}
213
214impl Line {
215 fn new(layout: Arc<LineLayout>, runs: &[(usize, RunStyle)]) -> Self {
216 let mut style_runs = SmallVec::new();
217 for (len, style) in runs {
218 style_runs.push(StyleRun {
219 len: *len as u32,
220 color: style.color,
221 underline: style.underline,
222 });
223 }
224 Self { layout, style_runs }
225 }
226
227 pub fn runs(&self) -> &[Run] {
228 &self.layout.runs
229 }
230
231 pub fn width(&self) -> f32 {
232 self.layout.width
233 }
234
235 pub fn font_size(&self) -> f32 {
236 self.layout.font_size
237 }
238
239 pub fn x_for_index(&self, index: usize) -> f32 {
240 for run in &self.layout.runs {
241 for glyph in &run.glyphs {
242 if glyph.index >= index {
243 return glyph.position.x();
244 }
245 }
246 }
247 self.layout.width
248 }
249
250 pub fn font_for_index(&self, index: usize) -> Option<FontId> {
251 for run in &self.layout.runs {
252 for glyph in &run.glyphs {
253 if glyph.index >= index {
254 return Some(run.font_id);
255 }
256 }
257 }
258
259 None
260 }
261
262 pub fn len(&self) -> usize {
263 self.layout.len
264 }
265
266 pub fn is_empty(&self) -> bool {
267 self.layout.len == 0
268 }
269
270 pub fn index_for_x(&self, x: f32) -> Option<usize> {
271 if x >= self.layout.width {
272 None
273 } else {
274 for run in self.layout.runs.iter().rev() {
275 for glyph in run.glyphs.iter().rev() {
276 if glyph.position.x() <= x {
277 return Some(glyph.index);
278 }
279 }
280 }
281 Some(0)
282 }
283 }
284
285 pub fn paint(
286 &self,
287 scene: &mut SceneBuilder,
288 origin: Vector2F,
289 visible_bounds: RectF,
290 line_height: f32,
291 cx: &mut WindowContext,
292 ) {
293 let padding_top = (line_height - self.layout.ascent - self.layout.descent) / 2.;
294 let baseline_offset = vec2f(0., padding_top + self.layout.ascent);
295
296 let mut style_runs = self.style_runs.iter();
297 let mut run_end = 0;
298 let mut color = Color::black();
299 let mut underline = None;
300
301 for run in &self.layout.runs {
302 let max_glyph_width = cx
303 .font_cache
304 .bounding_box(run.font_id, self.layout.font_size)
305 .x();
306
307 for glyph in &run.glyphs {
308 let glyph_origin = origin + baseline_offset + glyph.position;
309 if glyph_origin.x() > visible_bounds.upper_right().x() {
310 break;
311 }
312
313 let mut finished_underline = None;
314 if glyph.index >= run_end {
315 if let Some(style_run) = style_runs.next() {
316 if let Some((_, underline_style)) = underline {
317 if style_run.underline != underline_style {
318 finished_underline = underline.take();
319 }
320 }
321 if style_run.underline.thickness.into_inner() > 0. {
322 underline.get_or_insert((
323 vec2f(
324 glyph_origin.x(),
325 origin.y() + baseline_offset.y() + 0.618 * self.layout.descent,
326 ),
327 Underline {
328 color: Some(
329 style_run.underline.color.unwrap_or(style_run.color),
330 ),
331 thickness: style_run.underline.thickness,
332 squiggly: style_run.underline.squiggly,
333 },
334 ));
335 }
336
337 run_end += style_run.len as usize;
338 color = style_run.color;
339 } else {
340 run_end = self.layout.len;
341 finished_underline = underline.take();
342 }
343 }
344
345 if glyph_origin.x() + max_glyph_width < visible_bounds.origin().x() {
346 continue;
347 }
348
349 if let Some((underline_origin, underline_style)) = finished_underline {
350 scene.push_underline(scene::Underline {
351 origin: underline_origin,
352 width: glyph_origin.x() - underline_origin.x(),
353 thickness: underline_style.thickness.into(),
354 color: underline_style.color.unwrap(),
355 squiggly: underline_style.squiggly,
356 });
357 }
358
359 if glyph.is_emoji {
360 scene.push_image_glyph(scene::ImageGlyph {
361 font_id: run.font_id,
362 font_size: self.layout.font_size,
363 id: glyph.id,
364 origin: glyph_origin,
365 });
366 } else {
367 scene.push_glyph(scene::Glyph {
368 font_id: run.font_id,
369 font_size: self.layout.font_size,
370 id: glyph.id,
371 origin: glyph_origin,
372 color,
373 });
374 }
375 }
376 }
377
378 if let Some((underline_start, underline_style)) = underline.take() {
379 let line_end_x = origin.x() + self.layout.width;
380 scene.push_underline(scene::Underline {
381 origin: underline_start,
382 width: line_end_x - underline_start.x(),
383 color: underline_style.color.unwrap(),
384 thickness: underline_style.thickness.into(),
385 squiggly: underline_style.squiggly,
386 });
387 }
388 }
389
390 pub fn paint_wrapped(
391 &self,
392 scene: &mut SceneBuilder,
393 origin: Vector2F,
394 visible_bounds: RectF,
395 line_height: f32,
396 boundaries: &[ShapedBoundary],
397 cx: &mut WindowContext,
398 ) {
399 let padding_top = (line_height - self.layout.ascent - self.layout.descent) / 2.;
400 let baseline_offset = vec2f(0., padding_top + self.layout.ascent);
401
402 let mut boundaries = boundaries.into_iter().peekable();
403 let mut color_runs = self.style_runs.iter();
404 let mut style_run_end = 0;
405 let mut color = Color::black();
406 let mut underline: Option<(Vector2F, Underline)> = None;
407
408 let mut glyph_origin = origin;
409 let mut prev_position = 0.;
410 for (run_ix, run) in self.layout.runs.iter().enumerate() {
411 for (glyph_ix, glyph) in run.glyphs.iter().enumerate() {
412 glyph_origin.set_x(glyph_origin.x() + glyph.position.x() - prev_position);
413
414 if boundaries
415 .peek()
416 .map_or(false, |b| b.run_ix == run_ix && b.glyph_ix == glyph_ix)
417 {
418 boundaries.next();
419 if let Some((underline_origin, underline_style)) = underline {
420 scene.push_underline(scene::Underline {
421 origin: underline_origin,
422 width: glyph_origin.x() - underline_origin.x(),
423 thickness: underline_style.thickness.into(),
424 color: underline_style.color.unwrap(),
425 squiggly: underline_style.squiggly,
426 });
427 }
428
429 glyph_origin = vec2f(origin.x(), glyph_origin.y() + line_height);
430 }
431 prev_position = glyph.position.x();
432
433 let mut finished_underline = None;
434 if glyph.index >= style_run_end {
435 if let Some(style_run) = color_runs.next() {
436 style_run_end += style_run.len as usize;
437 color = style_run.color;
438 if let Some((_, underline_style)) = underline {
439 if style_run.underline != underline_style {
440 finished_underline = underline.take();
441 }
442 }
443 if style_run.underline.thickness.into_inner() > 0. {
444 underline.get_or_insert((
445 glyph_origin
446 + vec2f(0., baseline_offset.y() + 0.618 * self.layout.descent),
447 Underline {
448 color: Some(
449 style_run.underline.color.unwrap_or(style_run.color),
450 ),
451 thickness: style_run.underline.thickness,
452 squiggly: style_run.underline.squiggly,
453 },
454 ));
455 }
456 } else {
457 style_run_end = self.layout.len;
458 color = Color::black();
459 finished_underline = underline.take();
460 }
461 }
462
463 if let Some((underline_origin, underline_style)) = finished_underline {
464 scene.push_underline(scene::Underline {
465 origin: underline_origin,
466 width: glyph_origin.x() - underline_origin.x(),
467 thickness: underline_style.thickness.into(),
468 color: underline_style.color.unwrap(),
469 squiggly: underline_style.squiggly,
470 });
471 }
472
473 let glyph_bounds = RectF::new(
474 glyph_origin,
475 cx.font_cache
476 .bounding_box(run.font_id, self.layout.font_size),
477 );
478 if glyph_bounds.intersects(visible_bounds) {
479 if glyph.is_emoji {
480 scene.push_image_glyph(scene::ImageGlyph {
481 font_id: run.font_id,
482 font_size: self.layout.font_size,
483 id: glyph.id,
484 origin: glyph_bounds.origin() + baseline_offset,
485 });
486 } else {
487 scene.push_glyph(scene::Glyph {
488 font_id: run.font_id,
489 font_size: self.layout.font_size,
490 id: glyph.id,
491 origin: glyph_bounds.origin() + baseline_offset,
492 color,
493 });
494 }
495 }
496 }
497 }
498
499 if let Some((underline_origin, underline_style)) = underline.take() {
500 let line_end_x = glyph_origin.x() + self.layout.width - prev_position;
501 scene.push_underline(scene::Underline {
502 origin: underline_origin,
503 width: line_end_x - underline_origin.x(),
504 thickness: underline_style.thickness.into(),
505 color: underline_style.color.unwrap(),
506 squiggly: underline_style.squiggly,
507 });
508 }
509 }
510}
511
512impl Run {
513 pub fn glyphs(&self) -> &[Glyph] {
514 &self.glyphs
515 }
516}
517
518#[derive(Copy, Clone, Debug, PartialEq, Eq)]
519pub struct Boundary {
520 pub ix: usize,
521 pub next_indent: u32,
522}
523
524#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
525pub struct ShapedBoundary {
526 pub run_ix: usize,
527 pub glyph_ix: usize,
528}
529
530impl Boundary {
531 fn new(ix: usize, next_indent: u32) -> Self {
532 Self { ix, next_indent }
533 }
534}
535
536pub struct LineWrapper {
537 font_system: Arc<dyn FontSystem>,
538 pub(crate) font_id: FontId,
539 pub(crate) font_size: f32,
540 cached_ascii_char_widths: [f32; 128],
541 cached_other_char_widths: HashMap<char, f32>,
542}
543
544impl LineWrapper {
545 pub const MAX_INDENT: u32 = 256;
546
547 pub fn new(font_id: FontId, font_size: f32, font_system: Arc<dyn FontSystem>) -> Self {
548 Self {
549 font_system,
550 font_id,
551 font_size,
552 cached_ascii_char_widths: [f32::NAN; 128],
553 cached_other_char_widths: HashMap::new(),
554 }
555 }
556
557 pub fn wrap_line<'a>(
558 &'a mut self,
559 line: &'a str,
560 wrap_width: f32,
561 ) -> impl Iterator<Item = Boundary> + 'a {
562 let mut width = 0.0;
563 let mut first_non_whitespace_ix = None;
564 let mut indent = None;
565 let mut last_candidate_ix = 0;
566 let mut last_candidate_width = 0.0;
567 let mut last_wrap_ix = 0;
568 let mut prev_c = '\0';
569 let mut char_indices = line.char_indices();
570 iter::from_fn(move || {
571 for (ix, c) in char_indices.by_ref() {
572 if c == '\n' {
573 continue;
574 }
575
576 if self.is_boundary(prev_c, c) && first_non_whitespace_ix.is_some() {
577 last_candidate_ix = ix;
578 last_candidate_width = width;
579 }
580
581 if c != ' ' && first_non_whitespace_ix.is_none() {
582 first_non_whitespace_ix = Some(ix);
583 }
584
585 let char_width = self.width_for_char(c);
586 width += char_width;
587 if width > wrap_width && ix > last_wrap_ix {
588 if let (None, Some(first_non_whitespace_ix)) = (indent, first_non_whitespace_ix)
589 {
590 indent = Some(
591 Self::MAX_INDENT.min((first_non_whitespace_ix - last_wrap_ix) as u32),
592 );
593 }
594
595 if last_candidate_ix > 0 {
596 last_wrap_ix = last_candidate_ix;
597 width -= last_candidate_width;
598 last_candidate_ix = 0;
599 } else {
600 last_wrap_ix = ix;
601 width = char_width;
602 }
603
604 let indent_width =
605 indent.map(|indent| indent as f32 * self.width_for_char(' '));
606 width += indent_width.unwrap_or(0.);
607
608 return Some(Boundary::new(last_wrap_ix, indent.unwrap_or(0)));
609 }
610 prev_c = c;
611 }
612
613 None
614 })
615 }
616
617 pub fn wrap_shaped_line<'a>(
618 &'a mut self,
619 str: &'a str,
620 line: &'a Line,
621 wrap_width: f32,
622 ) -> impl Iterator<Item = ShapedBoundary> + 'a {
623 let mut first_non_whitespace_ix = None;
624 let mut last_candidate_ix = None;
625 let mut last_candidate_x = 0.0;
626 let mut last_wrap_ix = ShapedBoundary {
627 run_ix: 0,
628 glyph_ix: 0,
629 };
630 let mut last_wrap_x = 0.;
631 let mut prev_c = '\0';
632 let mut glyphs = line
633 .runs()
634 .iter()
635 .enumerate()
636 .flat_map(move |(run_ix, run)| {
637 run.glyphs()
638 .iter()
639 .enumerate()
640 .map(move |(glyph_ix, glyph)| {
641 let character = str[glyph.index..].chars().next().unwrap();
642 (
643 ShapedBoundary { run_ix, glyph_ix },
644 character,
645 glyph.position.x(),
646 )
647 })
648 })
649 .peekable();
650
651 iter::from_fn(move || {
652 while let Some((ix, c, x)) = glyphs.next() {
653 if c == '\n' {
654 continue;
655 }
656
657 if self.is_boundary(prev_c, c) && first_non_whitespace_ix.is_some() {
658 last_candidate_ix = Some(ix);
659 last_candidate_x = x;
660 }
661
662 if c != ' ' && first_non_whitespace_ix.is_none() {
663 first_non_whitespace_ix = Some(ix);
664 }
665
666 let next_x = glyphs.peek().map_or(line.width(), |(_, _, x)| *x);
667 let width = next_x - last_wrap_x;
668 if width > wrap_width && ix > last_wrap_ix {
669 if let Some(last_candidate_ix) = last_candidate_ix.take() {
670 last_wrap_ix = last_candidate_ix;
671 last_wrap_x = last_candidate_x;
672 } else {
673 last_wrap_ix = ix;
674 last_wrap_x = x;
675 }
676
677 return Some(last_wrap_ix);
678 }
679 prev_c = c;
680 }
681
682 None
683 })
684 }
685
686 fn is_boundary(&self, prev: char, next: char) -> bool {
687 (prev == ' ') && (next != ' ')
688 }
689
690 #[inline(always)]
691 fn width_for_char(&mut self, c: char) -> f32 {
692 if (c as u32) < 128 {
693 let mut width = self.cached_ascii_char_widths[c as usize];
694 if width.is_nan() {
695 width = self.compute_width_for_char(c);
696 self.cached_ascii_char_widths[c as usize] = width;
697 }
698 width
699 } else {
700 let mut width = self
701 .cached_other_char_widths
702 .get(&c)
703 .copied()
704 .unwrap_or(f32::NAN);
705 if width.is_nan() {
706 width = self.compute_width_for_char(c);
707 self.cached_other_char_widths.insert(c, width);
708 }
709 width
710 }
711 }
712
713 fn compute_width_for_char(&self, c: char) -> f32 {
714 self.font_system
715 .layout_line(
716 &c.to_string(),
717 self.font_size,
718 &[(
719 1,
720 RunStyle {
721 font_id: self.font_id,
722 color: Default::default(),
723 underline: Default::default(),
724 },
725 )],
726 )
727 .width
728 }
729}
730
731#[cfg(test)]
732mod tests {
733 use super::*;
734 use crate::fonts::{Properties, Weight};
735
736 #[crate::test(self)]
737 fn test_wrap_line(cx: &mut crate::AppContext) {
738 let font_cache = cx.font_cache().clone();
739 let font_system = cx.platform().fonts();
740 let family = font_cache
741 .load_family(&["Courier"], &Default::default())
742 .unwrap();
743 let font_id = font_cache.select_font(family, &Default::default()).unwrap();
744
745 let mut wrapper = LineWrapper::new(font_id, 16., font_system);
746 assert_eq!(
747 wrapper
748 .wrap_line("aa bbb cccc ddddd eeee", 72.0)
749 .collect::<Vec<_>>(),
750 &[
751 Boundary::new(7, 0),
752 Boundary::new(12, 0),
753 Boundary::new(18, 0)
754 ],
755 );
756 assert_eq!(
757 wrapper
758 .wrap_line("aaa aaaaaaaaaaaaaaaaaa", 72.0)
759 .collect::<Vec<_>>(),
760 &[
761 Boundary::new(4, 0),
762 Boundary::new(11, 0),
763 Boundary::new(18, 0)
764 ],
765 );
766 assert_eq!(
767 wrapper.wrap_line(" aaaaaaa", 72.).collect::<Vec<_>>(),
768 &[
769 Boundary::new(7, 5),
770 Boundary::new(9, 5),
771 Boundary::new(11, 5),
772 ]
773 );
774 assert_eq!(
775 wrapper
776 .wrap_line(" ", 72.)
777 .collect::<Vec<_>>(),
778 &[
779 Boundary::new(7, 0),
780 Boundary::new(14, 0),
781 Boundary::new(21, 0)
782 ]
783 );
784 assert_eq!(
785 wrapper
786 .wrap_line(" aaaaaaaaaaaaaa", 72.)
787 .collect::<Vec<_>>(),
788 &[
789 Boundary::new(7, 0),
790 Boundary::new(14, 3),
791 Boundary::new(18, 3),
792 Boundary::new(22, 3),
793 ]
794 );
795 }
796
797 #[crate::test(self, retries = 5)]
798 fn test_wrap_shaped_line(cx: &mut crate::AppContext) {
799 // This is failing intermittently on CI and we don't have time to figure it out
800 let font_cache = cx.font_cache().clone();
801 let font_system = cx.platform().fonts();
802 let text_layout_cache = TextLayoutCache::new(font_system.clone());
803
804 let family = font_cache
805 .load_family(&["Helvetica"], &Default::default())
806 .unwrap();
807 let font_id = font_cache.select_font(family, &Default::default()).unwrap();
808 let normal = RunStyle {
809 font_id,
810 color: Default::default(),
811 underline: Default::default(),
812 };
813 let bold = RunStyle {
814 font_id: font_cache
815 .select_font(
816 family,
817 &Properties {
818 weight: Weight::BOLD,
819 ..Default::default()
820 },
821 )
822 .unwrap(),
823 color: Default::default(),
824 underline: Default::default(),
825 };
826
827 let text = "aa bbb cccc ddddd eeee";
828 let line = text_layout_cache.layout_str(
829 text,
830 16.0,
831 &[(4, normal), (5, bold), (6, normal), (1, bold), (7, normal)],
832 );
833
834 let mut wrapper = LineWrapper::new(font_id, 16., font_system);
835 assert_eq!(
836 wrapper
837 .wrap_shaped_line(text, &line, 72.0)
838 .collect::<Vec<_>>(),
839 &[
840 ShapedBoundary {
841 run_ix: 1,
842 glyph_ix: 3
843 },
844 ShapedBoundary {
845 run_ix: 2,
846 glyph_ix: 3
847 },
848 ShapedBoundary {
849 run_ix: 4,
850 glyph_ix: 2
851 }
852 ],
853 );
854 }
855}