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micro optimization for scroll_up

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This commit is contained in:
Wez Furlong 2018-02-19 07:34:36 -08:00
parent a0faebad8b
commit 563408df6f
1 changed files with 12 additions and 5 deletions
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17
term/src/screen.rs
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@ -215,11 +215,18 @@ impl Screen {
}
}
for _ in 0..num_rows {
self.lines.insert(
phys_scroll.end - lines_removed,
Line::new(self.physical_cols),
);
if scroll_region.end as usize == self.physical_rows {
// It's cheaper to push() than it is insert() at the end
for _ in 0..num_rows {
self.lines.push(Line::new(self.physical_cols));
}
} else {
for _ in 0..num_rows {
self.lines.insert(
phys_scroll.end - lines_removed,
Line::new(self.physical_cols),
);
}
}
}