T06: hidden cells blank, inactive window hollows the cursor, glyphs painted on one baseline with CoreText's upward offsets flipped

src/app.rs

@@ -73,11 +73,11 @@ pub fn open(launch: Launch, cx: &mut App) -> anyhow::Result<WindowHandle<Workspa
         ..Default::default()
     };
     let (pty, events) = spawn(&launch, (80, 24), (8, 16), config(SettingsStore::get(cx)))?;
-    let terminal = cx.new(|cx| TerminalView::new(pty, events, cx));
     let window = cx.open_window(options, |window, cx| {
         window
             .observe_window_appearance(|_, cx| themes::apply(cx))
             .detach();
+        let terminal = cx.new(|cx| TerminalView::new(pty, events, window, cx));
         window.focus(&terminal.focus_handle(cx), cx);
         cx.new(|cx| Workspace {
             focus: cx.focus_handle(),

src/term/frame.rs

@@ -91,15 +91,17 @@ pub fn frame<T: EventListener>(term: &Term<T>, ink: &Ink) -> Frame {
         let spacer = cell
             .flags
             .intersects(Flags::WIDE_CHAR_SPACER | Flags::LEADING_WIDE_CHAR_SPACER);
+        let hidden = cell.flags.contains(Flags::HIDDEN);
         let cluster = cell
             .zerowidth()
+            .filter(|_| !hidden)
             .filter(|marks| !marks.is_empty())
             .map(|marks| {
                 std::iter::once(cell.c)
                     .chain(marks.iter().copied())
                     .collect::<String>()
             });
-        let shown = if spacer || cluster.is_some() {
+        let shown = if spacer || hidden || cluster.is_some() {
             ' '
         } else {
             cell.c
@@ -111,7 +113,7 @@ pub fn frame<T: EventListener>(term: &Term<T>, ink: &Ink) -> Frame {
                 column: point.column.0,
                 shape: content.cursor.shape,
                 wide: cell.flags.contains(Flags::WIDE_CHAR),
-                text: cluster.clone().unwrap_or_else(|| cell.c.to_string()),
+                text: cluster.clone().unwrap_or_else(|| shown.to_string()),
                 style: look,
             });
         }
@@ -140,10 +142,13 @@ fn style(cell: &Cell, ink: &Ink, set: &Colors) -> Style {
     if flags.contains(Flags::DIM) {
         fg = fg.opacity(DIM);
     }
-    if flags.contains(Flags::HIDDEN) {
+    let hidden = flags.contains(Flags::HIDDEN);
+    if hidden {
         fg = bg;
     }
-    let underline = if flags.contains(Flags::DOUBLE_UNDERLINE) {
+    let underline = if hidden {
+        Underline::None
+    } else if flags.contains(Flags::DOUBLE_UNDERLINE) {
         Underline::Double
     } else if flags.contains(Flags::UNDERCURL) {
         Underline::Curly
@@ -165,7 +170,7 @@ fn style(cell: &Cell, ink: &Ink, set: &Colors) -> Style {
         underline_color: cell
             .underline_color()
             .map_or(fg, |color| ink.resolve(color, set)),
-        strike: flags.contains(Flags::STRIKEOUT),
+        strike: flags.contains(Flags::STRIKEOUT) && !hidden,
     }
 }
 
@@ -252,8 +257,13 @@ mod tests {
     }
 
     #[test]
-    fn hidden_text_takes_its_ground() {
-        let (frame, ink) = shown(b"\x1b[8mh");
-        assert_eq!(frame.rows[0].runs[0].1.fg, ink.bg);
+    fn hidden_cells_show_nothing_but_their_ground() {
+        let (frame, _) = shown("\x1b[8;4;9;41mSe\u{301}\x1b[0m\x1b[2D".as_bytes());
+        assert_eq!(frame.rows[0].text.trim_end(), "");
+        assert!(frame.rows[0].clusters.is_empty());
+        let (_, style) = frame.rows[0].runs[0];
+        assert_eq!((style.underline, style.strike), (Underline::None, false));
+        assert!(style.bg.is_some(), "the ground stays");
+        assert_eq!(frame.cursor.expect("a cursor").text, " ");
     }
 }

src/term/paint.rs

@@ -2,9 +2,9 @@ use std::rc::Rc;
 
 use alacritty_terminal::vte::ansi::CursorShape;
 use gpui::{
-    App, Bounds, Entity, Font, FontId, FontStyle, FontWeight, Hsla, IntoElement, Pixels, Point,
-    Size, StrikethroughStyle, Styled, TextAlign, TextRun, UnderlineStyle, Window, canvas, fill,
-    outline, point, px, size,
+    Bounds, Entity, Font, FontId, FontStyle, FontWeight, Hsla, IntoElement, Pixels, Point, Size,
+    StrikethroughStyle, Styled, TextRun, UnderlineStyle, Window, canvas, fill, outline, point, px,
+    size,
 };
 
 use super::{
@@ -48,7 +48,7 @@ pub fn grid(
                 }
             });
         },
-        move |bounds, _, window, cx| {
+        move |bounds, _, window, _| {
             log::trace!(
                 "terminal: paint {:?}, row 0 {:?}",
                 bounds,
@@ -56,10 +56,10 @@ pub fn grid(
             );
             for (index, row) in frame.rows.iter().enumerate() {
                 let top = bounds.origin + point(px(0.), cell.height * index as f32);
-                paint_row(row, top, &look, window, cx);
+                paint_row(row, top, &look, window);
             }
             if let Some((cursor, shape)) = &cursor {
-                paint_cursor(cursor, *shape, bounds.origin, &look, window, cx);
+                paint_cursor(cursor, *shape, bounds.origin, &look, window);
             }
         },
     )
@@ -97,13 +97,7 @@ fn spans(row: &super::frame::Row) -> Vec<(usize, usize, Style)> {
         .collect()
 }
 
-fn paint_row(
-    row: &super::frame::Row,
-    top: Point<Pixels>,
-    look: &Look,
-    window: &mut Window,
-    cx: &mut App,
-) {
+fn paint_row(row: &super::frame::Row, top: Point<Pixels>, look: &Look, window: &mut Window) {
     let cell = look.cell;
     let at = |column: usize| top + point(cell.width * column as f32, px(0.));
     let spans = spans(row);
@@ -123,17 +117,9 @@ fn paint_row(
             runs(text, style, style.fg, look, window)
         })
         .collect();
-    let shaped = window.text_system().shape_line(
-        row.text.clone().into(),
-        look.size,
-        &runs,
-        Some(cell.width),
-    );
-    if let Err(error) = shaped.paint(top, cell.height, TextAlign::Left, None, window, cx) {
-        log::error!("terminal: a row failed to paint: {error:#}");
-    }
+    draw(&row.text, &runs, top, Some(cell.width), look, window);
     for (column, cluster, style) in &row.clusters {
-        text(cluster, style.fg, style, at(*column), look, window, cx);
+        text(cluster, style.fg, style, at(*column), look, window);
     }
     for (column, columns, style) in spans {
         let width = cell.width * columns as f32;
@@ -169,7 +155,7 @@ fn private(ch: char) -> bool {
     matches!(ch, '\u{E000}'..='\u{F8FF}' | '\u{F0000}'..='\u{FFFFD}' | '\u{100000}'..='\u{10FFFD}')
 }
 
-/// Paints `content` alone at `origin`, a cell's worth.
+/// Paints `content` alone at `origin`, a cell's top-left, its marks where shaping puts them.
 fn text(
     content: &str,
     color: Hsla,
@@ -177,20 +163,67 @@ fn text(
     origin: Point<Pixels>,
     look: &Look,
     window: &mut Window,
-    cx: &mut App,
 ) {
     let runs = runs(content, style, color, look, window);
-    let shaped = window.text_system().shape_line(
-        content.to_string().into(),
-        look.size,
-        &runs,
-        Some(look.cell.width),
-    );
-    if let Err(error) = shaped.paint(origin, look.cell.height, TextAlign::Left, None, window, cx) {
-        log::error!("terminal: `{content}` failed to paint: {error:#}");
+    draw(content, &runs, origin, None, look, window);
+}
+
+/// Shapes `content` and paints each glyph on the cell's baseline below `top`; `force` sets every advance.
+fn draw(
+    content: &str,
+    runs: &[TextRun],
+    top: Point<Pixels>,
+    force: Option<Pixels>,
+    look: &Look,
+    window: &mut Window,
+) {
+    let shaped =
+        window
+            .text_system()
+            .shape_line(content.to_string().into(), look.size, runs, force);
+    let baseline = top.y + look.baseline;
+    for run in &shaped.runs {
+        for glyph in &run.glyphs {
+            let color = color_at(runs, glyph.index);
+            let at = point(
+                top.x + glyph.position.x,
+                baseline + upward(glyph.position.y),
+            );
+            let painted = if glyph.is_emoji {
+                window.paint_emoji(at, run.font_id, glyph.id, look.size)
+            } else {
+                window.paint_glyph(at, run.font_id, glyph.id, look.size, color)
+            };
+            if let Err(error) = painted {
+                log::error!("terminal: a glyph of `{content}` failed to paint: {error:#}");
+            }
+        }
     }
 }
 
+/// The color of the run holding byte `index`.
+fn color_at(runs: &[TextRun], index: usize) -> Hsla {
+    let mut end = 0;
+    runs.iter()
+        .find(|run| {
+            end += run.len;
+            index < end
+        })
+        .expect("a glyph indexes its own text")
+        .color
+}
+
+/// CoreText gives glyph offsets growing upward; the screen grows downward.
+#[cfg(target_os = "macos")]
+fn upward(y: Pixels) -> Pixels {
+    -y
+}
+
+#[cfg(not(target_os = "macos"))]
+fn upward(y: Pixels) -> Pixels {
+    y
+}
+
 /// Underlines and strikethrough under `width` from `origin`, a cell's top-left.
 fn decorate(origin: Point<Pixels>, width: Pixels, style: &Style, look: &Look, window: &mut Window) {
     let rule = look.rule;
@@ -252,7 +285,6 @@ fn paint_cursor(
     origin: Point<Pixels>,
     look: &Look,
     window: &mut Window,
-    cx: &mut App,
 ) {
     let cell = look.cell;
     let corner = origin
@@ -272,7 +304,6 @@ fn paint_cursor(
                 corner,
                 look,
                 window,
-                cx,
             );
         }
         CursorShape::HollowBlock => {

src/term/view.rs

@@ -47,6 +47,7 @@ pub struct TerminalView {
     shown: bool,
     _events: Task<()>,
     _blink: Task<()>,
+    _activation: Subscription,
     _settings: Subscription,
 }
 
@@ -60,7 +61,7 @@ impl Focusable for TerminalView {
 
 impl TerminalView {
     /// Draws `pty`; the first layout fits its grid to the box.
-    pub fn new(pty: Pty, events: Events, cx: &mut Context<Self>) -> Self {
+    pub fn new(pty: Pty, events: Events, window: &mut Window, cx: &mut Context<Self>) -> Self {
         let size = {
             let term = pty.term.lock();
             (term.columns(), term.screen_lines())
@@ -74,6 +75,7 @@ impl TerminalView {
             shown: true,
             _events: Self::pump(events, cx),
             _blink: Self::blink(cx),
+            _activation: cx.observe_window_activation(window, |_, _, cx| cx.notify()),
             _settings: cx.observe_global::<SettingsStore>(|view, cx| {
                 view.pty
                     .term
@@ -228,7 +230,7 @@ impl Render for TerminalView {
         let shown = frame(&term, &ink);
         let blinks = term.cursor_style().blinking;
         drop(term);
-        let focused = self.focus.is_focused(window);
+        let focused = self.focus.is_focused(window) && window.is_window_active();
         self.blinking = focused && blinks;
         if !self.blinking {
             self.shown = true;