From 1e2c53d9739f13831f45f20b1f17b083580bf077 Mon Sep 17 00:00:00 2001
From: Bart Louwers <bart@emeel.net>
Date: Thu, 12 Feb 2026 22:16:21 +0100
Subject: [PATCH] set font for local glyph rasterizer GLFW app Apple platforms
 (#4098)

---
 platform/glfw/CMakeLists.txt     |  7 +++++++
 platform/glfw/glfw_apple_init.mm | 11 +++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 platform/glfw/glfw_apple_init.mm

diff --git a/platform/glfw/CMakeLists.txt b/platform/glfw/CMakeLists.txt
index 24cc00654..0b041888c 100644
--- a/platform/glfw/CMakeLists.txt
+++ b/platform/glfw/CMakeLists.txt
@@ -31,6 +31,13 @@ set_property(
     PROPERTY COMPILE_DEFINITIONS MLN_ASSETS_PATH=\"${PROJECT_SOURCE_DIR}/platform/glfw/assets/\"
 )
 
+if(APPLE)
+    target_sources(
+        mbgl-glfw
+        PRIVATE ${PROJECT_SOURCE_DIR}/platform/glfw/glfw_apple_init.mm
+    )
+endif()
+
 if(MLN_WITH_OPENGL)
     find_package(OpenGL REQUIRED)
     target_sources(
diff --git a/platform/glfw/glfw_apple_init.mm b/platform/glfw/glfw_apple_init.mm
new file mode 100644
index 000000000..92bd639db
--- /dev/null
+++ b/platform/glfw/glfw_apple_init.mm
@@ -0,0 +1,11 @@
+#import <Foundation/Foundation.h>
+
+// Called early in GLFW initialization so that the local glyph rasterizer
+// can find a suitable CJK font via NSUserDefaults.
+__attribute__((constructor))
+static void setDefaultIdeographicFont() {
+    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
+    if (![defaults objectForKey:@"MLNIdeographicFontFamilyName"]) {
+        [defaults setObject:@[@"PingFang TC"] forKey:@"MLNIdeographicFontFamilyName"];
+    }
+}