From a727273fbf9b228a3621b9567ea9502963ad53c4 Mon Sep 17 00:00:00 2001
From: Doug Lyons <douglyons@douglyons.com>
Date: Wed, 4 Feb 2026 00:39:05 -0600
Subject: [PATCH] [FREETYPE] HACK: Verify we have format 4 for
 tt_cmap4_char_map_binary (#8649)

[FREETYPE] HACK: Verify the cmap format 4 is used in the function
"tt_cmap4_char_map_binary" in ttcmap.c before proceeding.
Otherwise issue debug message.

CORE-12549
---
 sdk/lib/3rdparty/freetype/src/sfnt/ttcmap.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/sdk/lib/3rdparty/freetype/src/sfnt/ttcmap.c b/sdk/lib/3rdparty/freetype/src/sfnt/ttcmap.c
index 8d9737310c7..2b97a7ba809 100644
--- a/sdk/lib/3rdparty/freetype/src/sfnt/ttcmap.c
+++ b/sdk/lib/3rdparty/freetype/src/sfnt/ttcmap.c
@@ -1233,6 +1233,21 @@
     FT_UInt   gindex   = 0;
     FT_Byte*  p;
 
+#ifdef __REACTOS__
+    static FT_UInt bWarnOnce = 0;
+    /* FIXME: HACK for ReactOS not updating fonts when new font copied
+     * over existing one. Verify that the table number is 4. CORE-12549 */
+    if (TT_PEEK_USHORT(cmap->data) != 4)
+    {
+        if (!bWarnOnce)
+        {
+            FT_ERROR(( "Bad cmap table number. Probable update font error in file\n"
+                       "'%s'\nPlease reboot and try again.\n", __FILE__ ));
+            bWarnOnce++;
+        }
+        return 0;
+    }
+#endif
 
     p = cmap->data + 6;
     num_segs2 = FT_PAD_FLOOR( TT_PEEK_USHORT( p ), 2 );