If ciolib_initial_scaling is less than 1.0, interpret as multiplier

For example, if it was set to 0.4, the initial scaling would be set
to take at most 40% of the screen height or width (whichever is
smaller) with a minimum of 1.0

src/conio/sdl_con.c

@@ -355,6 +355,16 @@ static int sdl_init_mode(int mode, bool init)
 		h = 0;
 	}
 	bitmap_drv_init_mode(mode, &bitmap_width, &bitmap_height, w, h);
+	if (ciolib_initial_scaling < 1.0) {
+		if (w != 0 && h != 0) {
+			w *= ciolib_initial_scaling;
+			h *= ciolib_initial_scaling;
+			ciolib_initial_scaling = bitmap_double_mult_inside(w, h);
+		}
+		else {
+			ciolib_initial_scaling = 1.0;
+		}
+	}
 	if (init) {
 		internal_scaling = (ciolib_initial_scaling_type == CIOLIB_SCALING_INTERNAL);
 		if (ciolib_initial_scaling) {

src/conio/win32gdi.c

@@ -830,6 +830,16 @@ gdi_thread(void *arg)
 		goto fail;
 	pthread_mutex_lock(&vstatlock);
 	if (ciolib_initial_scaling != 0) {
+		if (ciolib_internal_scaling < 1.0) {
+			if (get_monitor_size_pos(&vstat.winwidth, &vstat.winheight, &wx, &wy)) {
+				vstat.winwidth *= ciolib_internal_scaling;
+				vstat.winheight *= ciolib_internal_scaling;
+				ciolib_initial_scaling = bitmap_double_mult_inside(vstat.winwidth, vstat.winheight);
+			}
+			else {
+				ciolib_initial_scaling = 1.0;
+			}
+		}
 		bitmap_get_scaled_win_size(ciolib_initial_scaling, &vstat.winwidth, &vstat.winheight, 0, 0);
 		vstat.scaling = ciolib_initial_scaling;
 	}

src/conio/x_events.c

@@ -1234,10 +1234,21 @@ static int init_mode(int mode)
 
 static int video_init()
 {
+	int w, h;
+
 	pthread_mutex_lock(&vstatlock);
 	x_internal_scaling = (ciolib_initial_scaling_type == CIOLIB_SCALING_INTERNAL);
-	if (ciolib_initial_scaling != 0.0)
+	if (ciolib_initial_scaling != 0.0) {
+		if (ciolib_initial_scaling < 1.0) {
+			if (x11_get_maxsize(&w, &h)) {
+				ciolib_initial_scaling = bitmap_double_mult_inside(w, h);
+			}
+			else {
+				ciolib_initial_scaling = 1.0;
+			}
+		}
 		x_cvstat.scaling = vstat.scaling = ciolib_initial_scaling;
+	}
 	if (x_cvstat.scaling < 1.0 || vstat.scaling < 1.0)
 		x_cvstat.scaling = vstat.scaling = 1.0;
 	if(load_vmode(&vstat, ciolib_initial_mode)) {