Fix multiple underlines/strikeouts on the same line

This commit fixes regression introduced in ddee14a.

3 files changed, 58 insertions, 66 deletions

diff --git a/alacritty_terminal/src/display.rs b/alacritty_terminal/src/display.rs
index 8e094129..c8ef8054 100644
--- a/alacritty_terminal/src/display.rs
+++ b/alacritty_terminal/src/display.rs
@@ -27,7 +27,7 @@ use crate::config::{Config, StartupMode};
 use crate::index::Line;
 use crate::message_bar::Message;
 use crate::meter::Meter;
-use crate::renderer::rects::{Rect, Rects};
+use crate::renderer::rects::{RenderRect, RenderLines};
 use crate::renderer::{self, GlyphCache, QuadRenderer};
 use crate::sync::FairMutex;
 use crate::term::color::Rgb;
@@ -511,7 +511,7 @@ impl Display {
 
         {
             let glyph_cache = &mut self.glyph_cache;
-            let mut rects = Rects::new();
+            let mut lines = RenderLines::new();
 
             // Draw grid
             {
@@ -521,7 +521,7 @@ impl Display {
                     // Iterate over all non-empty cells in the grid
                     for cell in grid_cells {
                         // Update underline/strikeout
-                        rects.update_lines(&cell, &size_info, &metrics);
+                        lines.update(&cell);
 
                         // Draw the cell
                         api.render_cell(cell, glyph_cache);
@@ -529,14 +529,21 @@ impl Display {
                 });
             }
 
+            let mut rects = lines.into_rects(&metrics, &size_info);
+
             if let Some(message) = message_buffer {
                 let text = message.text(&size_info);
 
                 // Create a new rectangle for the background
                 let start_line = size_info.lines().0 - text.len();
                 let y = size_info.padding_y + size_info.cell_height * start_line as f32;
-                let rect = Rect::new(0., y, size_info.width, size_info.height - y);
-                rects.push(rect, message.color());
+                rects.push(RenderRect::new(
+                    0.,
+                    y,
+                    size_info.width,
+                    size_info.height - y,
+                    message.color(),
+                ));
 
                 // Draw rectangles including the new background
                 self.renderer.draw_rects(config, &size_info, visual_bell_intensity, rects);
diff --git a/alacritty_terminal/src/renderer/mod.rs b/alacritty_terminal/src/renderer/mod.rs
index cd94247f..f074c6d5 100644
--- a/alacritty_terminal/src/renderer/mod.rs
+++ b/alacritty_terminal/src/renderer/mod.rs
@@ -31,7 +31,7 @@ use crate::cursor::{get_cursor_glyph, CursorKey};
 use crate::gl;
 use crate::gl::types::*;
 use crate::index::{Column, Line};
-use crate::renderer::rects::{Rect, Rects};
+use crate::renderer::rects::RenderRect;
 use crate::term::color::Rgb;
 use crate::term::{self, cell, RenderableCell, RenderableCellContent};
 
@@ -679,7 +679,7 @@ impl QuadRenderer {
         config: &Config,
         props: &term::SizeInfo,
         visual_bell_intensity: f64,
-        cell_line_rects: Rects,
+        cell_line_rects: Vec<RenderRect>,
     ) {
         // Swap to rectangle rendering program
         unsafe {
@@ -710,12 +710,12 @@ impl QuadRenderer {
 
         // Draw visual bell
         let color = config.visual_bell.color;
-        let rect = Rect::new(0., 0., props.width, props.height);
-        self.render_rect(&rect, color, visual_bell_intensity as f32, props);
+        let rect = RenderRect::new(0., 0., props.width, props.height, color);
+        self.render_rect(&rect, visual_bell_intensity as f32, props);
 
         // Draw underlines and strikeouts
-        for cell_line_rect in cell_line_rects.rects() {
-            self.render_rect(&cell_line_rect.0, cell_line_rect.1, 255., props);
+        for cell_line_rect in cell_line_rects {
+            self.render_rect(&cell_line_rect, 255., props);
         }
 
         // Deactivate rectangle program again
@@ -849,7 +849,7 @@ impl QuadRenderer {
     // Render a rectangle
     //
     // This requires the rectangle program to be activated
-    fn render_rect(&mut self, rect: &Rect<f32>, color: Rgb, alpha: f32, size: &term::SizeInfo) {
+    fn render_rect(&mut self, rect: &RenderRect, alpha: f32, size: &term::SizeInfo) {
         // Do nothing when alpha is fully transparent
         if alpha == 0. {
             return;
@@ -876,7 +876,7 @@ impl QuadRenderer {
             );
 
             // Color
-            self.rect_program.set_color(color, alpha);
+            self.rect_program.set_color(rect.color, alpha);
 
             // Draw the rectangle
             gl::DrawElements(gl::TRIANGLES, 6, gl::UNSIGNED_INT, ptr::null());
diff --git a/alacritty_terminal/src/renderer/rects.rs b/alacritty_terminal/src/renderer/rects.rs
index a2844c02..72139e3d 100644
--- a/alacritty_terminal/src/renderer/rects.rs
+++ b/alacritty_terminal/src/renderer/rects.rs
@@ -21,29 +21,31 @@ use crate::term::color::Rgb;
 use crate::term::{RenderableCell, SizeInfo};
 
 #[derive(Debug, Copy, Clone)]
-pub struct Rect<T> {
-    pub x: T,
-    pub y: T,
-    pub width: T,
-    pub height: T,
+pub struct RenderRect {
+    pub x: f32,
+    pub y: f32,
+    pub width: f32,
+    pub height: f32,
+    pub color: Rgb,
 }
 
-impl<T> Rect<T> {
-    pub fn new(x: T, y: T, width: T, height: T) -> Self {
-        Rect { x, y, width, height }
+impl RenderRect {
+    pub fn new(x: f32, y: f32, width: f32, height: f32, color: Rgb) -> Self {
+        RenderRect { x, y, width, height, color }
     }
 }
 
-struct Line {
-    rect: Rect<f32>,
+struct RenderLine {
     start: Point,
+    end: Point,
     color: Rgb,
 }
 
-impl Line {
-    /// Create a line that starts on the left of `cell` and is one cell wide
-    fn from_cell(cell: &RenderableCell, flag: Flags, metrics: &Metrics, size: &SizeInfo) -> Line {
-        let cell_x = cell.column.0 as f32 * size.cell_width;
+impl RenderLine {
+    fn into_rect(self, flag: Flags, metrics: &Metrics, size: &SizeInfo) -> RenderRect {
+        let start_x = self.start.col.0 as f32 * size.cell_width;
+        let end_x = (self.end.col.0 + 1) as f32 * size.cell_width;
+        let width = end_x - start_x;
 
         let (position, mut height) = match flag {
             Flags::UNDERLINE => (metrics.underline_position, metrics.underline_thickness),
@@ -54,48 +56,42 @@ impl Line {
         // Make sure lines are always visible
         height = height.max(1.);
 
-        let cell_bottom = (cell.line.0 as f32 + 1.) * size.cell_height;
-        let baseline = cell_bottom + metrics.descent;
+        let line_bottom = (self.start.line.0 as f32 + 1.) * size.cell_height;
+        let baseline = line_bottom + metrics.descent;
 
         let mut y = baseline - position - height / 2.;
-        let max_y = cell_bottom - height;
+        let max_y = line_bottom - height;
         if y > max_y {
             y = max_y;
         }
 
-        let rect = Rect::new(cell_x + size.padding_x, y + size.padding_y, size.cell_width, height);
-
-        Self { start: cell.into(), color: cell.fg, rect }
-    }
-
-    fn update_end(&mut self, end: Point, size: &SizeInfo) {
-        self.rect.width = (end.col + 1 - self.start.col).0 as f32 * size.cell_width;
+        RenderRect::new(start_x + size.padding_x, y + size.padding_y, width, height, self.color)
     }
 }
 
-/// Rects for underline, strikeout and more.
+/// Lines for underline and strikeout.
 #[derive(Default)]
-pub struct Rects {
-    inner: HashMap<Flags, Vec<Line>>,
+pub struct RenderLines {
+    inner: HashMap<Flags, Vec<RenderLine>>,
 }
 
-impl Rects {
+impl RenderLines {
     pub fn new() -> Self {
         Self::default()
     }
 
-    /// Convert the stored rects to rectangles for the renderer.
-    pub fn rects(&self) -> Vec<(Rect<f32>, Rgb)> {
+    pub fn into_rects(self, metrics: &Metrics, size: &SizeInfo) -> Vec<RenderRect> {
         self.inner
-            .iter()
-            .map(|(_, lines)| lines)
+            .into_iter()
+            .map(|(flag, lines)| -> Vec<RenderRect> {
+                lines.into_iter().map(|line| line.into_rect(flag, &metrics, &size)).collect()
+            })
             .flatten()
-            .map(|line| (line.rect, line.color))
             .collect()
     }
 
     /// Update the stored lines with the next cell info.
-    pub fn update_lines(&mut self, cell: &RenderableCell, size: &SizeInfo, metrics: &Metrics) {
+    pub fn update(&mut self, cell: &RenderableCell) {
         for flag in &[Flags::UNDERLINE, Flags::STRIKEOUT] {
             if !cell.flags.contains(*flag) {
                 continue;
@@ -103,35 +99,24 @@ impl Rects {
 
             // Check if there's an active line
             if let Some(line) = self.inner.get_mut(flag).and_then(|lines| lines.last_mut()) {
-                if cell.line == line.start.line && cell.fg == line.color {
+                if cell.line == line.start.line
+                    && cell.fg == line.color
+                    && cell.column == line.end.col + 1
+                {
                     // Update the length of the line
-                    line.update_end(cell.into(), size);
-
+                    line.end = cell.into();
                     continue;
                 }
             }
 
             // Start new line if there currently is none
-            let rect = Line::from_cell(cell, *flag, metrics, size);
+            let line = RenderLine { start: cell.into(), end: cell.into(), color: cell.fg };
             match self.inner.get_mut(flag) {
-                Some(lines) => lines.push(rect),
+                Some(lines) => lines.push(line),
                 None => {
-                    self.inner.insert(*flag, vec![rect]);
+                    self.inner.insert(*flag, vec![line]);
                 },
             }
         }
     }
-
-    // Add a rectangle
-    pub fn push(&mut self, rect: Rect<f32>, color: Rgb) {
-        let line = Line { start: Point::default(), color, rect };
-
-        // Flag `HIDDEN` for hashmap index is arbitrary
-        match self.inner.get_mut(&Flags::HIDDEN) {
-            Some(lines) => lines.push(line),
-            None => {
-                self.inner.insert(Flags::HIDDEN, vec![line]);
-            },
-        }
-    }
 }