From fee681ac78eb7438bb749bbff870d4255e32a551 Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Sun, 27 Nov 2022 15:44:12 -0800
Subject: [PATCH] dashed underlines

---
 src/font/sprite.zig           |  1 +
 src/font/sprite/Face.zig      |  1 +
 src/font/sprite/underline.zig | 16 ++++++++++++++++
 src/renderer/OpenGL.zig       |  1 +
 4 files changed, 19 insertions(+)

diff --git a/src/font/sprite.zig b/src/font/sprite.zig
index f5b232061..16c307554 100644
--- a/src/font/sprite.zig
+++ b/src/font/sprite.zig
@@ -17,6 +17,7 @@ pub const Sprite = enum(u32) {
     underline = start,
     underline_double = start + 1,
     underline_dotted = start + 2,
+    underline_dashed = start + 3,
 
     // 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 829cecc09..60c356548 100644
--- a/src/font/sprite/Face.zig
+++ b/src/font/sprite/Face.zig
@@ -86,6 +86,7 @@ const Kind = enum {
                 .underline,
                 .underline_double,
                 .underline_dotted,
+                .underline_dashed,
                 => .underline,
             },
 
diff --git a/src/font/sprite/underline.zig b/src/font/sprite/underline.zig
index 4ce2aad31..87c25a9d5 100644
--- a/src/font/sprite/underline.zig
+++ b/src/font/sprite/underline.zig
@@ -70,6 +70,7 @@ const Draw = struct {
             .underline => self.drawSingle(canvas),
             .underline_double => self.drawDouble(canvas),
             .underline_dotted => self.drawDotted(canvas),
+            .underline_dashed => self.drawDashed(canvas),
         }
     }
 
@@ -114,6 +115,21 @@ const Draw = struct {
             }, .on);
         }
     }
+
+    /// Draw a dashed underline.
+    fn drawDashed(self: Draw, canvas: *font.sprite.Canvas) void {
+        const dash_width = self.width / 3 + 1;
+        const dash_count = (self.width / dash_width) + 1;
+        var i: u32 = 0;
+        while (i < dash_count) : (i += 2) {
+            canvas.rect(.{
+                .x = i * dash_width,
+                .y = self.pos,
+                .width = dash_width,
+                .height = self.thickness,
+            }, .on);
+        }
+    }
 };
 
 test "single" {
diff --git a/src/renderer/OpenGL.zig b/src/renderer/OpenGL.zig
index 35659490d..b83f746cb 100644
--- a/src/renderer/OpenGL.zig
+++ b/src/renderer/OpenGL.zig
@@ -1010,6 +1010,7 @@ pub fn updateCell(
             .single => .underline,
             .double => .underline_double,
             .dotted => .underline_dotted,
+            .dashed => .underline_dashed,
             else => .underline,
         };