[client] spice: added basic mouse smoothing for non-capture mode

Enabled by default, can be disabled with `input:mouseSmoothing`

client/src/config.c

@@ -282,6 +282,13 @@ static struct Option options[] =
     .type           = OPTION_TYPE_INT,
     .value.x_int    = 0,
   },
+  {
+    .module         = "input",
+    .name           = "mouseSmoothing",
+    .description    = "Apply simple mouse smoothing when not in capture mode (helps reduce aliasing)",
+    .type           = OPTION_TYPE_BOOL,
+    .value.x_bool   = true,
+  },
   {
     .module         = "input",
     .name           = "rawMouse",
@@ -467,6 +474,7 @@ bool config_load(int argc, char * argv[])
   params.ignoreWindowsKeys   = option_get_bool("input", "ignoreWindowsKeys"  );
   params.hideMouse           = option_get_bool("input", "hideCursor"         );
   params.mouseSens           = option_get_int ("input", "mouseSens"          );
+  params.mouseSmoothing      = option_get_bool("input", "mouseSmoothing"     );
   params.rawMouse            = option_get_bool("input", "rawMouse"           );
   params.mouseRedraw         = option_get_bool("input", "mouseRedraw"        );
   params.autoCapture         = option_get_bool("input", "autoCapture"        );

client/src/main.c

@@ -877,15 +877,21 @@ static void cursorToInt(double ex, double ey, int *x, int *y)
 
 static void handleMouseGrabbed(double ex, double ey)
 {
+  int x, y;
+
   /* apply sensitivity */
   if (g_cursor.sens != 0)
   {
     ex = (ex / 10.0) * (g_cursor.sens + 10);
     ey = (ey / 10.0) * (g_cursor.sens + 10);
+    cursorToInt(ex, ey, &x, &y);
+  }
+  else
+  {
+    x = floor(ex);
+    y = floor(ey);
   }
 
-  int x, y;
-  cursorToInt(ex, ey, &x, &y);
   if (x == 0 && y == 0)
     return;
 
@@ -1023,7 +1029,16 @@ static void handleMouseNormal(double ex, double ey)
   }
 
   int x, y;
+  if (params.mouseSmoothing)
+  {
+    static struct DoublePoint last = { 0 };
+    last.x = (last.x + ex) / 2.0;
+    last.y = (last.y + ey) / 2.0;
+    cursorToInt(last.x, last.y, &x, &y);
+  }
+  else
     cursorToInt(ex, ey, &x, &y);
+
   if (x == 0 && y == 0)
     return;
 

client/src/main.h

@@ -138,6 +138,7 @@ struct AppParams
   const char * windowTitle;
   bool         mouseRedraw;
   int          mouseSens;
+  bool         mouseSmoothing;
   bool         rawMouse;
   bool         autoCapture;
 };