From 4f9d7c565a13a38d21ac1b0f1fe16c79be3fc0d0 Mon Sep 17 00:00:00 2001
From: Qwerasd <qwerasd205@users.noreply.github.com>
Date: Sun, 29 Jun 2025 16:11:55 -0600
Subject: [PATCH] font/sprite: add explicit underline cursor

Resolves #7651 - uses cursor thickness rather than underline thickness.
---
 src/font/sprite.zig              |  1 +
 src/font/sprite/draw/special.zig | 18 ++++++++++++++++++
 src/renderer/generic.zig         |  2 +-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/font/sprite.zig b/src/font/sprite.zig
index 4be06a918..cf86fa6dd 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,
 
     test {
         const testing = std.testing;
diff --git a/src/font/sprite/draw/special.zig b/src/font/sprite/draw/special.zig
index 3d75360e3..e41cac487 100644
--- a/src/font/sprite/draw/special.zig
+++ b/src/font/sprite/draw/special.zig
@@ -326,3 +326,21 @@ pub fn cursor_bar(
         .height = @intCast(height),
     }, .on);
 }
+
+pub fn cursor_underline(
+    cp: u32,
+    canvas: *font.sprite.Canvas,
+    width: u32,
+    height: u32,
+    metrics: font.Metrics,
+) !void {
+    _ = cp;
+    _ = height;
+
+    canvas.rect(.{
+        .x = 0,
+        .y = @intCast(metrics.underline_position),
+        .width = @intCast(width),
+        .height = @intCast(metrics.cursor_thickness),
+    }, .on);
+}
diff --git a/src/renderer/generic.zig b/src/renderer/generic.zig
index fba577231..0e97808af 100644
--- a/src/renderer/generic.zig
+++ b/src/renderer/generic.zig
@@ -3098,7 +3098,7 @@ 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,
                     };
 
-- 
2.51.2