From 88ac96242f0d36e53876ece9f90baf776616f0bc Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Wed, 3 Jul 2024 10:43:54 +1000
Subject: Load fonts asynchronously on a bg task

This saves a second or two from bootup; AFAICT this *mostly* reclaims
the dynamic fonts boot time regression.
---
 lua/font.lua | 36 +++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

(limited to 'lua/font.lua')

diff --git a/lua/font.lua b/lua/font.lua
index 7afa1e01..c76602ec 100644
--- a/lua/font.lua
+++ b/lua/font.lua
@@ -1,6 +1,36 @@
 local lvgl = require("lvgl")
 
-return {
-  fusion_12 = lvgl.Font("//lua/fonts/fusion12"),
-  fusion_10 = lvgl.Font("//lua/fonts/fusion10"),
+local fonts = {}
+local fonts_priv = {
+  has_invoked_cb = false,
+  cb = nil,
 }
+
+function fonts_priv.has_loaded_all()
+  return fonts.fusion_12 and fonts.fusion_10
+end
+
+function fonts_priv.invoke_cb()
+  if fonts_priv.has_invoked_cb or not fonts_priv.cb then return end
+  if not fonts_priv.has_loaded_all() then return end
+  fonts_priv.has_invoked_cb = true
+  fonts_priv.cb()
+end
+
+lvgl.Font("//lua/fonts/fusion12", function(font)
+  fonts.fusion_12 = font
+  fonts_priv.invoke_cb()
+end)
+
+lvgl.Font("//lua/fonts/fusion10", function(font)
+  fonts.fusion_10 = font
+  fonts_priv.invoke_cb()
+end)
+
+function fonts.on_loaded(cb)
+  fonts_priv.cb = cb
+  fonts_priv.has_invoked_cb = false
+  fonts_priv.invoke_cb()
+end
+
+return fonts
-- 
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