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perf: speed up SetColors by ~15-25% (#879)

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The SetColors command was executing SetForegroundColor and then
SetBackgroundColor, which writes 2 extra characters per cell compared to
writing both colors in one command. This resulted in about 15-25% more
FPS (19->24 fps) on a fullscreen (171x51) app that writes every cell
with a different foreground and background color, compared to separately
using the SetForegroundColor and SetBackgroundColor commands (iTerm2, M2
Macbook Pro).

The app is the colors_rgb example in Ratatui, which writes every cell
with a different foreground and background color in a loop. The
CrosstermBackend was changed to use SetColors instead of
SetForegroundColor and SetBackgroundColor.
This commit is contained in:
Josh McKinney 2024-05-03 09:53:06 -07:00 committed by GitHub
parent 99fe255f33
commit 7efe19da28
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GPG Key ID: B5690EEEBB952194
1 changed files with 17 additions and 6 deletions
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23
src/style.rs
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@ -279,13 +279,24 @@ pub struct SetColors(pub Colors);
impl Command for SetColors {
fn write_ansi(&self, f: &mut impl fmt::Write) -> fmt::Result {
if let Some(color) = self.0.foreground {
SetForegroundColor(color).write_ansi(f)?;
// Writing both foreground and background colors in one command resulted in about 20% more
// FPS (20 to 24 fps) on a fullscreen (171x51) app that writes every cell with a different
// foreground and background color, compared to separately using the SetForegroundColor and
// SetBackgroundColor commands (iTerm2, M2 Macbook Pro). `Esc[38;5;<fg>mEsc[48;5;<bg>m` (16
// chars) vs `Esc[38;5;<fg>;48;5;<bg>m` (14 chars)
match (self.0.foreground, self.0.background) {
(Some(fg), Some(bg)) => {
write!(
f,
csi!("{};{}m"),
Colored::ForegroundColor(fg),
Colored::BackgroundColor(bg)
)
}
(Some(fg), None) => write!(f, csi!("{}m"), Colored::ForegroundColor(fg)),
(None, Some(bg)) => write!(f, csi!("{}m"), Colored::BackgroundColor(bg)),
(None, None) => Ok(()),
}
if let Some(color) = self.0.background {
SetBackgroundColor(color).write_ansi(f)?;
}
Ok(())
}
#[cfg(windows)]