From 14336e8d39a0361491bcfd50e3dc9d50d26bbacc Mon Sep 17 00:00:00 2001
From: FunkyFr3sh <cc.red.alert.1@googlemail.com>
Date: Sun, 19 Jan 2025 05:32:07 +0100
Subject: [PATCH] add guard lines on both on top and bottom of the buffer

---
 src/ddsurface.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/ddsurface.c b/src/ddsurface.c
index 8d68052..c6d3350 100644
--- a/src/ddsurface.c
+++ b/src/ddsurface.c
@@ -1553,17 +1553,17 @@ HRESULT dd_CreateSurface(
             if (dst_surface->hdc)
                 InterlockedIncrement(&g_dds_gdi_handles);
 
+            DWORD map_offset = dst_surface->pitch * g_config.guard_lines;
+
             dst_surface->mapping =
                 CreateFileMappingA(
                     INVALID_HANDLE_VALUE,
                     NULL,
                     PAGE_READWRITE | SEC_COMMIT,
                     0,
-                    bmp_size + 256,
+                    bmp_size + 256 + map_offset,
                     NULL);
 
-            DWORD map_offset = 0;
-
             if (dst_surface->mapping)
             {
                 LPVOID data = MapViewOfFile(dst_surface->mapping, FILE_MAP_ALL_ACCESS, 0, 0, 0);