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fix(performance): keep track of scrollback buffer size (#881)

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Fix #877. Avoid calculating scrollback buffer size on each render, since the calculation becomes slower proportionally to the amount of lines buffered, and to the width of each line.
* wip: keep track of scrollback buffer size

* account for lines dropped by bounded_push

* fix: use saturating sub

* fix: account for 0 width lines

* remove log messages
This commit is contained in:
Thomas Linford 2021-11-22 18:34:45 +01:00 • committed by GitHub
parent 639566df15
commit 707fedd1df
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 85 additions and 19 deletions
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104
zellij-server/src/panes/grid.rs
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@ -106,7 +106,7 @@ fn transfer_rows_from_lines_above_to_viewport(
viewport: &mut Vec<Row>,
count: usize,
max_viewport_width: usize,
) {
) -> usize {
let mut next_lines: Vec<Row> = vec![];
let mut lines_added_to_viewport: isize = 0;
loop {
@ -137,6 +137,10 @@ fn transfer_rows_from_lines_above_to_viewport(
let excess_row = Row::from_rows(next_lines, 0);
bounded_push(lines_above, excess_row);
}
match usize::try_from(lines_added_to_viewport) {
Ok(n) => n,
_ => 0,
}
}
fn transfer_rows_from_viewport_to_lines_above(
@ -144,12 +148,15 @@ fn transfer_rows_from_viewport_to_lines_above(
lines_above: &mut VecDeque<Row>,
count: usize,
max_viewport_width: usize,
) {
) -> isize {
let mut next_lines: Vec<Row> = vec![];
let mut transferred_rows_count: isize = 0;
for _ in 0..count {
if next_lines.is_empty() {
if !viewport.is_empty() {
let next_line = viewport.remove(0);
transferred_rows_count +=
calculate_row_display_height(next_line.width(), max_viewport_width) as isize;
if !next_line.is_canonical {
let mut bottom_canonical_row_and_wraps_in_dst =
get_lines_above_bottom_canonical_row_and_wraps(lines_above);
@ -161,7 +168,11 @@ fn transfer_rows_from_viewport_to_lines_above(
break; // no more rows
}
}
bounded_push(lines_above, next_lines.remove(0));
let dropped_line_width = bounded_push(lines_above, next_lines.remove(0));
if let Some(width) = dropped_line_width {
transferred_rows_count -=
calculate_row_display_height(width, max_viewport_width) as isize;
}
}
if !next_lines.is_empty() {
let excess_rows = Row::from_rows(next_lines, max_viewport_width)
@ -170,6 +181,7 @@ fn transfer_rows_from_viewport_to_lines_above(
viewport.insert(0, row);
}
}
transferred_rows_count
}
fn transfer_rows_from_lines_below_to_viewport(
@ -212,11 +224,16 @@ fn transfer_rows_from_lines_below_to_viewport(
}
}
fn bounded_push(vec: &mut VecDeque<Row>, value: Row) {
fn bounded_push(vec: &mut VecDeque<Row>, value: Row) -> Option<usize> {
let mut dropped_line_width = None;
if vec.len() >= SCROLL_BACK {
vec.pop_front();
let line = vec.pop_front();
if let Some(line) = line {
dropped_line_width = Some(line.width());
}
}
vec.push_back(value)
vec.push_back(value);
dropped_line_width
}
pub fn create_horizontal_tabstops(columns: usize) -> BTreeSet<usize> {
@ -232,6 +249,21 @@ pub fn create_horizontal_tabstops(columns: usize) -> BTreeSet<usize> {
horizontal_tabstops
}
fn calculate_row_display_height(row_width: usize, viewport_width: usize) -> usize {
if row_width <= viewport_width {
return 1;
}
(row_width as f64 / viewport_width as f64).ceil() as usize
}
fn subtract_isize_from_usize(u: usize, i: isize) -> usize {
if i.is_negative() {
u - i.abs() as usize
} else {
u + i as usize
}
}
#[derive(Debug)]
pub struct CharacterChunk {
pub terminal_characters: Vec<TerminalCharacter>,
@ -362,6 +394,7 @@ pub struct Grid {
pub selection: Selection,
pub title: Option<String>,
pub is_scrolled: bool,
scrollback_buffer_lines: usize,
}
impl Debug for Grid {
@ -407,6 +440,7 @@ impl Grid {
title: None,
changed_colors: None,
is_scrolled: false,
scrollback_buffer_lines: 0,
}
}
pub fn render_full_viewport(&mut self) {
@ -453,23 +487,28 @@ impl Grid {
pub fn cursor_shape(&self) -> CursorShape {
self.cursor.get_shape()
}
pub fn scrollback_position_and_length(&self) -> (usize, usize) {
pub fn scrollback_position_and_length(&mut self) -> (usize, usize) {
// (position, length)
(
self.lines_below.len(),
(self.scrollback_buffer_lines + self.lines_below.len()),
)
}
fn recalculate_scrollback_buffer_count(&self) -> usize {
let mut scrollback_buffer_count = 0;
for row in self.lines_above.iter() {
let row_width = row.width();
// rows in lines_above are unwrapped, so we need to account for that
if row_width > self.width {
scrollback_buffer_count += (row_width as f64 / self.width as f64).ceil() as usize;
scrollback_buffer_count += calculate_row_display_height(row_width, self.width);
} else {
scrollback_buffer_count += 1;
}
}
(
self.lines_below.len(),
(scrollback_buffer_count + self.lines_below.len()),
)
scrollback_buffer_count
}
fn set_horizontal_tabstop(&mut self) {
self.horizontal_tabstops.insert(self.cursor.x);
}
@ -543,12 +582,15 @@ impl Grid {
let line_to_push_down = self.viewport.pop().unwrap();
self.lines_below.insert(0, line_to_push_down);
transfer_rows_from_lines_above_to_viewport(
let transferred_rows_height = transfer_rows_from_lines_above_to_viewport(
&mut self.lines_above,
&mut self.viewport,
1,
self.width,
);
self.scrollback_buffer_lines = self
.scrollback_buffer_lines
.saturating_sub(transferred_rows_height);
self.selection.move_down(1);
}
@ -557,12 +599,25 @@ impl Grid {
pub fn scroll_down_one_line(&mut self) {
if !self.lines_below.is_empty() && self.viewport.len() == self.height {
let mut line_to_push_up = self.viewport.remove(0);
if line_to_push_up.is_canonical {
bounded_push(&mut self.lines_above, line_to_push_up);
self.scrollback_buffer_lines +=
calculate_row_display_height(line_to_push_up.width(), self.width);
let line_to_push_up = if line_to_push_up.is_canonical {
line_to_push_up
} else {
let mut last_line_above = self.lines_above.pop_back().unwrap();
last_line_above.append(&mut line_to_push_up.columns);
bounded_push(&mut self.lines_above, last_line_above);
last_line_above
};
let dropped_line_width = bounded_push(&mut self.lines_above, line_to_push_up);
if let Some(width) = dropped_line_width {
let dropped_line_height = calculate_row_display_height(width, self.width);
self.scrollback_buffer_lines = self
.scrollback_buffer_lines
.saturating_sub(dropped_line_height);
}
transfer_rows_from_lines_below_to_viewport(
@ -753,6 +808,7 @@ impl Grid {
if self.scroll_region.is_some() {
self.set_scroll_region_to_viewport_size();
}
self.scrollback_buffer_lines = self.recalculate_scrollback_buffer_count();
self.output_buffer.update_all_lines();
}
pub fn as_character_lines(&self) -> Vec<Vec<TerminalCharacter>> {
@ -846,12 +902,16 @@ impl Grid {
}
pub fn fill_viewport(&mut self, character: TerminalCharacter) {
let row_count_to_transfer = self.viewport.len();
transfer_rows_from_viewport_to_lines_above(
let transferred_rows_count = transfer_rows_from_viewport_to_lines_above(
&mut self.viewport,
&mut self.lines_above,
row_count_to_transfer,
self.width,
);
self.scrollback_buffer_lines =
subtract_isize_from_usize(self.scrollback_buffer_lines, transferred_rows_count);
for _ in 0..self.height {
let columns = VecDeque::from(vec![character; self.width]);
self.viewport.push(Row::from_columns(columns).canonical());
@ -893,12 +953,15 @@ impl Grid {
if self.cursor.y == self.height - 1 {
if self.scroll_region.is_none() {
let row_count_to_transfer = 1;
transfer_rows_from_viewport_to_lines_above(
let transferred_rows_count = transfer_rows_from_viewport_to_lines_above(
&mut self.viewport,
&mut self.lines_above,
row_count_to_transfer,
self.width,
);
self.scrollback_buffer_lines =
subtract_isize_from_usize(self.scrollback_buffer_lines, transferred_rows_count);
self.selection.move_up(1);
}
self.output_buffer.update_all_lines();
@ -968,12 +1031,14 @@ impl Grid {
self.cursor.x = 0;
if self.cursor.y == self.height - 1 {
let row_count_to_transfer = 1;
transfer_rows_from_viewport_to_lines_above(
let transferred_rows_count = transfer_rows_from_viewport_to_lines_above(
&mut self.viewport,
&mut self.lines_above,
row_count_to_transfer,
self.width,
);
self.scrollback_buffer_lines =
subtract_isize_from_usize(self.scrollback_buffer_lines, transferred_rows_count);
let wrapped_row = Row::new(self.width);
self.viewport.push(wrapped_row);
self.selection.move_up(1);
@ -1264,6 +1329,7 @@ impl Grid {
self.cursor.change_shape(CursorShape::Initial);
self.output_buffer.update_all_lines();
self.changed_colors = None;
self.scrollback_buffer_lines = 0;
}
fn set_preceding_character(&mut self, terminal_character: TerminalCharacter) {
self.preceding_char = Some(terminal_character);