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Create should_cache_each_paragraph_individually and heed max_rows

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This commit is contained in:
Emil Ernerfeldt
2025-03-28 11:33:56 +01:00
parent 085d9b56e9
commit 8a45db62f1
1 changed files with 12 additions and 5 deletions
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17
crates/epaint/src/text/fonts.rs
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@@ -772,11 +772,7 @@ impl GalleyCache {
cached.galley.clone()
}
std::collections::hash_map::Entry::Vacant(entry) => {
// If the text contains newlines that will always break into a new row then
// we can easily lay out all the lines individually and then merge the `Galley`s.
// This allows individual lines to be cached separately which means small
// modifications to the source text will only cause impacted lines to be laid out again.
if job.break_on_newline && job.text.contains('\n') {
if should_cache_each_paragraph_individually(&job) {
let galley = self.layout_multiline(fonts, job);
let galley = Arc::new(galley);
self.cache.insert(
@@ -908,6 +904,17 @@ impl GalleyCache {
}
}
/// If true, lay out and cache each paragraph (sections separated by newlines) individually.
///
/// This makes it much faster to re-lauout the full tet when only a portion of it has changed since last frame, i.e. when editing somewhere in a file with thousands of lines/paragraphs.
fn should_cache_each_paragraph_individually(job: &LayoutJob) -> bool {
// We currently don't support this elided text, i.e. when `max_rows` is set.
// Most often, elided text is elided to one row,
// and so will always be fast to lay out.
job.break_on_newline && job.wrap.max_rows == usize::MAX && job.text.contains('\n')
}
/// Append each galley under the previous one.
fn concat_galleys(job: LayoutJob, galleys: &[Arc<Galley>], pixels_per_point: f32) -> Galley {
let mut merged_galley = Galley {
job: Arc::new(job),