Feature: Multiple rotating views on title screen

1 files changed, 13 insertions, 1 deletions

diff --git a/src/main_gui.cpp b/src/main_gui.cpp
index 79960d51b..944a28405 100644
--- a/src/main_gui.cpp
+++ b/src/main_gui.cpp
@@ -152,12 +152,24 @@ void ZoomInOrOutToCursorWindow(bool in, Window *w)
 	}
 }
 
-void FixTitleGameZoom()
+void FixTitleGameZoom(int zoom_adjust)
 {
 	if (_game_mode != GM_MENU) return;
 
 	Viewport *vp = FindWindowByClass(WC_MAIN_WINDOW)->viewport;
+
+	/* Adjust the zoom in/out.
+	 * Can't simply add, since operator+ is not defined on the ZoomLevel type. */
 	vp->zoom = _gui_zoom;
+	while (zoom_adjust < 0 && vp->zoom != ZOOM_LVL_MIN) {
+		vp->zoom--;
+		zoom_adjust++;
+	}
+	while (zoom_adjust > 0 && vp->zoom != ZOOM_LVL_MAX) {
+		vp->zoom++;
+		zoom_adjust--;
+	}
+
 	vp->virtual_width = ScaleByZoom(vp->width, vp->zoom);
 	vp->virtual_height = ScaleByZoom(vp->height, vp->zoom);
 }