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improve scroll_up perf

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We were marking the entire scrollback history as dirty on each line
scroll.  This was from the early days and isn't needed any more.
This brings the runtime of:

```
$ find /usr > /tmp/usr-files.txt
$ time cat /tmp/usr-files.txt
```

down from ~2.5s to ~1.2s.

Also avoid a redundant line_mut() call in set_cell().
This commit is contained in:
Wez Furlong 2018-02-19 08:14:03 -08:00
parent 966eb2ce4c
commit 1b989b011d
1 changed files with 8 additions and 15 deletions
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23
term/src/screen.rs
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@ -105,18 +105,19 @@ impl Screen {
attr
);
let line = self.line_mut(line_idx);
if attr.hyperlink.is_some() {
self.line_mut(line_idx).set_has_hyperlink(true);
line.set_has_hyperlink(true);
}
let cells = &mut self.line_mut(line_idx).cells;
let width = cells.len();
let width = line.cells.len();
// if the line isn't wide enough, pad it out with the default attributes
if x >= width {
cells.resize(x + 1, Cell::default());
line.cells.resize(x + 1, Cell::default());
}
cells[x] = Cell::from_char(c, attr);
&cells[x]
line.cells[x] = Cell::from_char(c, attr);
&line.cells[x]
}
pub fn clear_line(&mut self, y: VisibleRowIndex, cols: std::ops::Range<usize>) {
@ -179,7 +180,7 @@ impl Screen {
pub fn scroll_up(&mut self, scroll_region: &Range<VisibleRowIndex>, num_rows: usize) {
debug!("scroll_up {:?} {}", scroll_region, num_rows);
let phys_scroll = self.phys_range(&scroll_region);
assert!(num_rows <= phys_scroll.end - phys_scroll.start);
debug_assert!(num_rows <= phys_scroll.end - phys_scroll.start);
// Invalidate the lines that will move before they move so that
// the indices of the lines are stable (we may remove lines below)
@ -207,14 +208,6 @@ impl Screen {
self.lines.remove(phys_scroll.start);
}
if scroll_region.start == 0 {
// All of the lines above the top are now effectively dirty because
// they were moved into scrollback by the scroll operation.
for y in 0..phys_scroll.start {
self.line_mut(y).set_dirty();
}
}
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 {