From 692c8f58b75d5e037c91676fb32320a3208ed26a Mon Sep 17 00:00:00 2001
From: Brandon Wright <bearoso@gmail.com>
Date: Thu, 7 Jun 2018 09:42:25 -0500
Subject: [PATCH] Sanity check automatic input rate for deviations > 5%.

---
 gtk/src/gtk_s9xwindow.cpp | 9 ++++++++-
 win32/win32_display.cpp   | 9 ++++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/gtk/src/gtk_s9xwindow.cpp b/gtk/src/gtk_s9xwindow.cpp
index f414139b..88494801 100644
--- a/gtk/src/gtk_s9xwindow.cpp
+++ b/gtk/src/gtk_s9xwindow.cpp
@@ -1620,7 +1620,14 @@ Snes9xWindow::get_refresh_rate (void)
 int
 Snes9xWindow::get_auto_input_rate (void)
 {
-    return (int) (get_refresh_rate () * 32040.0 / 60.09881389744051 + 0.5);
+    double new_input_rate = get_refresh_rate () * 32040.0 / 60.09881389744051 + 0.5;
+
+    if (new_input_rate > 32040.0 * 1.05)
+        new_input_rate = 32040.0;
+    if (new_input_rate < 32040.0 * 0.95)
+        new_input_rate = 32040.0 * 0.95;
+
+    return new_input_rate;
 }
 
 static void set_bypass_compositor (Display *dpy, Window window, unsigned char bypass)
diff --git a/win32/win32_display.cpp b/win32/win32_display.cpp
index e69f2740..0c9339a9 100644
--- a/win32/win32_display.cpp
+++ b/win32/win32_display.cpp
@@ -752,7 +752,14 @@ double WinGetRefreshRate(void)
 
 int WinGetAutomaticInputRate(void)
 {
-	return (int)(WinGetRefreshRate() * 32040.0 / 60.09881389744051 + 0.5);
+    double newInputRate = WinGetRefreshRate() * 32040.0 / 60.09881389744051 + 0.5;
+
+    if (newInputRate > 32040.0 * 1.05)
+        newInputRate = 32040.0;
+    if (newInputRate < 32040.0 * 0.95)
+        newInputRate = 32040.0 * 0.95;
+
+    return newInputRate;
 }
 
 /* Depth conversion functions begin */