[client] x11: change to a more visible "dot" cursor

This change alters the small square dot cursor to a more visible 16x16
cursor for X11. A new option `spice:largeDotCursor` can be set to use an
alternative 32x32 cursor for the vision impaired.

client/src/config.c

@@ -499,6 +499,13 @@ static struct Option options[] =
     .type          = OPTION_TYPE_BOOL,
     .value.x_bool  = true
   },
+  {
+    .module        = "spice",
+    .name          = "largeCursorDot",
+    .description   = "Use a larger version of the \"dot\" cursor",
+    .type          = OPTION_TYPE_BOOL,
+    .value.x_bool  = false
+  },
 
   // audio options
   {
@@ -728,6 +735,7 @@ bool config_load(int argc, char * argv[])
     g_params.captureOnStart   = option_get_bool("spice", "captureOnStart");
     g_params.alwaysShowCursor = option_get_bool("spice", "alwaysShowCursor");
     g_params.showCursorDot    = option_get_bool("spice", "showCursorDot");
+    g_params.largeCursorDot   = option_get_bool("spice", "largeCursorDot");
   }
 
   g_params.audioPeriodSize = option_get_int("audio", "periodSize");

client/src/main.c

@@ -1337,6 +1337,7 @@ static int lg_run(void)
     .resizable           = g_params.allowResize,
     .borderless          = g_params.borderless,
     .maximize            = g_params.maximize,
+    .largeCursorDot      = g_params.largeCursorDot,
     .opengl              = needsOpenGL,
     .jitRender           = g_params.jitRender
   };

client/src/main.h

@@ -218,6 +218,7 @@ struct AppParams
   bool                 autoCapture;
   bool                 captureInputOnly;
   bool                 showCursorDot;
+  bool                 largeCursorDot;
 
   int                  audioPeriodSize;
   int                  audioBufferLatency;