gui: don't truncate values to 0 after scaling

Avoids invisible lines (e.g. input cursor) when scaling down.

Change-Id: I595e8bdb2fa468c30f104867ad77be2423ec287f

gui/gui.cpp

@@ -990,7 +990,10 @@ extern "C" void set_scale_values(float w, float h)
 extern "C" int scale_theme_x(int initial_x)
 {
 	if (scale_theme_w != 1) {
-		return (int) ((float)initial_x * scale_theme_w);
+		int scaled = (float)initial_x * scale_theme_w;
+		if (scaled == 0 && initial_x > 0)
+			return 1;
+		return scaled;
 	}
 	return initial_x;
 }
@@ -998,7 +1001,10 @@ extern "C" int scale_theme_x(int initial_x)
 extern "C" int scale_theme_y(int initial_y)
 {
 	if (scale_theme_h != 1) {
-		return (int) ((float)initial_y * scale_theme_h);
+		int scaled = (float)initial_y * scale_theme_h;
+		if (scaled == 0 && initial_y > 0)
+			return 1;
+		return scaled;
 	}
 	return initial_y;
 }

gui/gui.h

@@ -37,7 +37,6 @@ int scale_theme_y(int initial_y);
 int scale_theme_min(int initial_value);
 float get_scale_w();
 float get_scale_h();
-float get_scale_h();
 
 #endif  // _GUI_HEADER
 

gui/objects.hpp

@@ -893,7 +893,6 @@ protected:
 class GUIInput : public GUIObject, public RenderObject, public ActionObject, public InputObject
 {
 public:
-	// w and h may be ignored, in which case, no bounding box is applied
 	GUIInput(xml_node<>* node);
 	virtual ~GUIInput();