# HG changeset patch
# Parent 3c8795c7ae1beae0393b6959eb012802cddbd755

diff -r 3c8795c7ae1b src/rail_gui.cpp
--- a/src/rail_gui.cpp	Tue Sep 03 09:44:21 2013 +0200
+++ b/src/rail_gui.cpp	Tue Sep 03 09:44:22 2013 +0200
@@ -1504,6 +1504,26 @@
 		}
 	}
 
+	virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
+	{
+		if (IsInsideMM(widget, WID_BS_SEMAPHORE_NORM, WID_BS_ELECTRIC_PBS_OWAY + 1)) {
+			/* Extract signal from widget number. */
+			int type = (widget - WID_BS_SEMAPHORE_NORM) % SIGTYPE_END;
+			int var = (widget < WID_BS_ELECTRIC_NORM) ? SIG_SEMAPHORE : SIG_ELECTRIC;
+			/* Fit the widget to signal sprites. */
+			Dimension dim = { 0, 0 };
+			const SpriteID *images = GetRailTypeInfo(_cur_railtype)->gui_sprites.signals[type][var];
+			for (uint lowered = 0; lowered < 2; lowered++) {
+				const Sprite *sprite = GetSprite(images[lowered], ST_NORMAL);
+				dim.width = max<int>(dim.width, UnScaleByZoom(sprite->width, ZOOM_LVL_GUI));
+				dim.height = max<int>(dim.height, UnScaleByZoom(sprite->height, ZOOM_LVL_GUI));
+			}
+			dim.width += padding.width + 4;
+			dim.height += padding.height + 4;
+			*size = maxdim(*size, dim);
+		}
+	}
+
 	virtual void DrawWidget(const Rect &r, int widget) const
 	{
 		if (IsInsideMM(widget, WID_BS_SEMAPHORE_NORM, WID_BS_ELECTRIC_PBS_OWAY + 1)) {