From bc90cbbb88f1b845a230cf5e5b331a8b5f8f0871 Mon Sep 17 00:00:00 2001
From: Dmitry Borisov <di.sean@protonmail.com>
Date: Sat, 31 Oct 2020 01:06:30 +0600
Subject: [PATCH] [WIN32K:NTUSER] Fix gradient caption bars with low color
 depth (#3338)

This fixes a problem when the window title bar is dithered down
to the 16- or 256-color palette. See also commit 0705f30.
---
 win32ss/user/ntuser/sysparams.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/win32ss/user/ntuser/sysparams.c b/win32ss/user/ntuser/sysparams.c
index 3907b17aff7..32b62cc026f 100644
--- a/win32ss/user/ntuser/sysparams.c
+++ b/win32ss/user/ntuser/sysparams.c
@@ -1583,7 +1583,17 @@ SpiGetSet(UINT uiAction, UINT uiParam, PVOID pvParam, FLONG fl)
             return SpiSetUserPref(UPM_LISTBOXSMOOTHSCROLLING, pvParam, fl);
 
         case SPI_GETGRADIENTCAPTIONS:
-            return SpiGetUserPref(UPM_GRADIENTCAPTIONS, pvParam, fl);
+        {
+            if (NtGdiGetDeviceCaps(ScreenDeviceContext, BITSPIXEL) <= 8)
+            {
+                INT iValue = 0;
+                return SpiGetInt(pvParam, &iValue, fl);
+            }
+            else
+            {
+                return SpiGetUserPref(UPM_GRADIENTCAPTIONS, pvParam, fl);
+            }
+        }
 
         case SPI_SETGRADIENTCAPTIONS:
             return SpiSetUserPref(UPM_GRADIENTCAPTIONS, pvParam, fl);