using Cell directly fixes fullscreen performance

src/core/render.rs

@@ -1,6 +1,6 @@
 use crate::core::*;
 pub(crate) use ratatui::prelude::*;
-use ratatui::buffer::Cell;
+pub(crate) use ratatui::buffer::Cell;
 use ratatui::widgets::WidgetRef;
 
 pub trait Blit {

src/view/layout/mod.rs

@@ -1,9 +1,10 @@
 mod focus;     pub use self::focus::*;
 mod container; pub use self::container::*;
 mod scroll;    pub use self::scroll::*;
-mod table;     pub use self::table::*;
 mod lozenge;   pub use self::lozenge::*;
 
+pub mod table;
+
 use crate::core::*;
 
 pub trait Modal<T>: Device {

src/view/sequencer.rs

@@ -80,22 +80,39 @@ mod horizontal {
         }
     }
 
-    pub const KEYS_VERTICAL: [&'static str; 6] = [
-        "▄", "▄", "█", "▀", "▀", "▀",
-    ];
-
     pub fn keys (buf: &mut Buffer, area: Rect, note0: usize, _notes: &[bool])
         -> Usually<Rect>
     {
-        let bw = Style::default().dim();
+        let dim = Style::default().dim();
+
+        let mut cell_bg = Cell::default();
+        cell_bg.set_char('░');
+        cell_bg.set_style(dim.black());
+
+        let mut cell_full = Cell::default();
+        cell_full.set_char('█');
+        cell_full.set_style(dim);
+
+        let mut cell_hi = Cell::default();
+        cell_hi.set_char('▀');
+        cell_hi.set_style(dim);
+
+        let mut cell_lo = Cell::default();
+        cell_lo.set_char('▄');
+        cell_lo.set_style(dim);
+
+        let keys = [&cell_lo, &cell_lo, &cell_full, &cell_hi, &cell_hi, &cell_hi];
+
         let Rect { x, y, width, height } = area;
+        let height = height.min(128);
         let h = height.saturating_sub(2);
         for index in 0..h {
             let y = y + h - index;
-            let key = KEYS_VERTICAL[(index % 6) as usize];
-            key.blit(buf, x + 1, y, Some(bw));
-            "█".blit(buf, x + 2, y, Some(bw));
-            "░".repeat(width.saturating_sub(6) as usize).blit(buf, x + 5, y, Some(bw.black()));
+            *buf.get_mut(x + 1, y) = keys[(index % 6) as usize].clone();
+            *buf.get_mut(x + 2, y) = cell_full.clone();
+            for x in x+5..x+width-1 {
+                *buf.get_mut(x, y) = cell_bg.clone();
+            }
             let note_a = note0 + (index * 2) as usize;
             if note_a % 12 == 0 {
                 let octave = format!("C{}", (note_a / 12) as i8 - 2);
@@ -130,6 +147,9 @@ mod horizontal {
         let offset   = 5;
         for x in x+offset..x+width-offset {
             let step = (time0 + (x-offset) as usize) * time_z;
+            if step > phrase.length {
+                break
+            }
             let next_step = (time0 + (x-offset) as usize + 1) * time_z;
             if step % ppq == 0 {
                 "|".blit(buf, x as u16, y, Some(Style::default().dim()));
@@ -152,9 +172,6 @@ mod horizontal {
                   (false, false) => (if step % ppq == 0 { "|" } else { "·" }, bw),
                 };
                 let y = y + height.saturating_sub(index+2) as u16;
-                if step > phrase.length {
-                    style = Style::default().gray()
-                }
                 character.blit(buf, x, y, Some(style));
             }
         }