From c6355dfa61b747a4a6bbf44840c2feb130b260c2 Mon Sep 17 00:00:00 2001
From: Stewart Allen <stewart.allen@gmail.com>
Date: Thu, 13 Feb 2025 11:43:16 -0500
Subject: [PATCH] calc font fg color using filament color bg

---
 mods/bambu/bambu.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mods/bambu/bambu.js b/mods/bambu/bambu.js
index dec6f5eb..261327d4 100644
--- a/mods/bambu/bambu.js
+++ b/mods/bambu/bambu.js
@@ -275,6 +275,7 @@ self.kiri.load(api => {
                     tray_now === tray.id ? `border-color: red` : undefined,
                     tray.tray_color ? undefined : `border-style: dashed`,
                     `background-color:#${tray.tray_color||'000'}`,
+                    `color:#${calcFG(tray.tray_color||'000')}`,
                     `min-height:10px`,
                     `aspect-ratio:1`
                 ].filter(v => v).join(';')
@@ -469,6 +470,14 @@ self.kiri.load(api => {
         }
     }
 
+    function calcFG(bg) {
+        let r = parseInt(bg.substring(0, 2), 16);
+        let g = parseInt(bg.substring(2, 4), 16);
+        let b = parseInt(bg.substring(4, 6), 16);
+        let luminance = (0.2126 * r + 0.7152 * g + 0.0722 * b) / 255;
+        return luminance > 0.5 ? "000000" : "FFFFFF";
+    }
+
     api.event.on("init-done", function() {
         if (init) {
             return;