From: Toni Wilen <twilen@winuae.net>
Date: Sat, 25 Mar 2023 16:29:26 +0000 (+0200)
Subject: Fix last visible line calculation
X-Git-Tag: 5.0.0~105
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=0fbb3439bb22a2cfb7bf666fc188c4a7664e5508;p=francis%2Fwinuae.git

Fix last visible line calculation
---

diff --git a/custom.cpp b/custom.cpp
index 55ec4d57..7923727e 100644
--- a/custom.cpp
+++ b/custom.cpp
@@ -5,7 +5,7 @@
 *
 * Copyright 1995-2002 Bernd Schmidt
 * Copyright 1995 Alessandro Bissacco
-* Copyright 2000-2021 Toni Wilen
+* Copyright 2000-2023 Toni Wilen
 */
 
 #include "sysconfig.h"
@@ -7236,7 +7236,7 @@ static void init_hz(bool checkvposw)
 		}
 	}
 
-	if (maxvpos_display_vsync < 0) {
+	if (maxvpos_display_vsync <= 0) {
 		maxvpos_display_vsync = 0;
 	}
 
@@ -7260,9 +7260,6 @@ static void init_hz(bool checkvposw)
 		if (maxvpos_display_vsync >= vsstrt + 3) {
 			maxvpos_display_vsync = vsstrt + 3;
 		}
-		if (maxvpos_display_vsync < 0) {
-			maxvpos_display_vsync = 0;
-		}
 		if (minfirstline < vsync_startline) {
 			minfirstline = vsync_startline;
 		}
@@ -7299,11 +7296,15 @@ static void init_hz(bool checkvposw)
 			if (firstblankedline < maxvpos / 2 && maxvpos_display_vsync > firstblankedline) {
 				maxvpos_display_vsync = firstblankedline;
 			} else if (firstblankedline <= maxvpos) {
-				maxvpos_display_vsync = 0;
+				maxvpos_display_vsync = 1;
 			}
 		}
 	}
 
+	if (maxvpos_display_vsync <= 0) {
+		maxvpos_display_vsync = 1;
+	}
+
 	if (maxvpos_nom >= MAXVPOS) {
 		maxvpos_nom = MAXVPOS;
 	}