SDL: Fix gamepad mouse cursor wrapping on hi-res screens

The cursor position was overflowing a signed 16-bits integer once
multiplied with MULTIPLIER when using a resolution such as 2560x1440.

It would be nice changing this code to make more sense, sadly it is
thightly coupled with platform specific subclasses.

Fixes #10996.

2 files changed, 4 insertions, 3 deletions

diff --git a/backends/events/sdl/sdl-events.cpp b/backends/events/sdl/sdl-events.cpp
index 50235171f5..29be7d4e74 100644
--- a/backends/events/sdl/sdl-events.cpp
+++ b/backends/events/sdl/sdl-events.cpp
@@ -287,8 +287,8 @@ void SdlEventSource::updateKbdMouse() {
 }
 
 bool SdlEventSource::handleKbdMouse(Common::Event &event) {
-	int16 oldKmX = _km.x;
-	int16 oldKmY = _km.y;
+	int32 oldKmX = _km.x;
+	int32 oldKmY = _km.y;
 
 	updateKbdMouse();
 
diff --git a/backends/events/sdl/sdl-events.h b/backends/events/sdl/sdl-events.h
index 8ee51147a4..c2ae0023ce 100644
--- a/backends/events/sdl/sdl-events.h
+++ b/backends/events/sdl/sdl-events.h
@@ -66,7 +66,8 @@ protected:
 	//@{
 
 	struct KbdMouse {
-		int16 x, y, x_vel, y_vel, x_max, y_max, x_down_count, y_down_count, joy_x, joy_y;
+		int32 x, y;
+		int16 x_vel, y_vel, x_max, y_max, x_down_count, y_down_count, joy_x, joy_y;
 		uint32 last_time, delay_time, x_down_time, y_down_time;
 		bool modifier;
 	};