From 7d078590b90457d7c306f51231ef29ffa9958369 Mon Sep 17 00:00:00 2001
From: Aaron Ruan <i@ar212.com>
Date: Wed, 25 Jun 2025 22:50:08 +0800
Subject: [PATCH] Add support for adjusting thickness of underline cursor

Signed-off-by: Aaron Ruan <i@ar212.com>
---
 src/font/sprite.zig        | 1 +
 src/font/sprite/Face.zig   | 1 +
 src/font/sprite/cursor.zig | 6 ++++++
 src/renderer/generic.zig   | 2 +-
 4 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/font/sprite.zig b/src/font/sprite.zig
index 6485d6008..0ec4acce3 100644
--- a/src/font/sprite.zig
+++ b/src/font/sprite.zig
@@ -32,6 +32,7 @@ pub const Sprite = enum(u32) {
     cursor_rect,
     cursor_hollow_rect,
     cursor_bar,
+    cursor_underline,
 
     // Note: we don't currently put the box drawing glyphs in here because
     // there are a LOT and I'm lazy. What I want to do is spend more time
diff --git a/src/font/sprite/Face.zig b/src/font/sprite/Face.zig
index af0c0af6a..29be7937e 100644
--- a/src/font/sprite/Face.zig
+++ b/src/font/sprite/Face.zig
@@ -174,6 +174,7 @@ const Kind = enum {
                 .cursor_rect,
                 .cursor_hollow_rect,
                 .cursor_bar,
+                .cursor_underline,
                 => .cursor,
             },
 
diff --git a/src/font/sprite/cursor.zig b/src/font/sprite/cursor.zig
index d63db624a..8a5f9a6b9 100644
--- a/src/font/sprite/cursor.zig
+++ b/src/font/sprite/cursor.zig
@@ -43,6 +43,12 @@ pub fn renderGlyph(
             .width = thickness,
             .height = height,
         }, .on),
+        Sprite.cursor_underline => canvas.rect(.{
+            .x = 0,
+            .y = height -| thickness,
+            .width = width,
+            .height = thickness,
+        }, .on),
         else => unreachable,
     }
 
diff --git a/src/renderer/generic.zig b/src/renderer/generic.zig
index 9589cb44b..6ddc2e1e2 100644
--- a/src/renderer/generic.zig
+++ b/src/renderer/generic.zig
@@ -2868,7 +2868,7 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
                         .block => .cursor_rect,
                         .block_hollow => .cursor_hollow_rect,
                         .bar => .cursor_bar,
-                        .underline => .underline,
+                        .underline => .cursor_underline,
                         .lock => unreachable,
                     };