From 1a15f7e6a73ed7bbc16813fcd69b3e8b270a8a73 Mon Sep 17 00:00:00 2001
From: alberth <alberth@openttd.org>
Date: Sun, 30 Aug 2009 17:38:28 +0000
Subject: [PATCH] (svn r17325) -Codechange: Un-duplicate engine drawing
 routines.

---
 src/build_vehicle_gui.cpp | 13 +----------
 src/engine_gui.cpp        | 46 ++++++++++++++++++++++++++++++++-------
 src/engine_gui.h          |  2 ++
 3 files changed, 41 insertions(+), 20 deletions(-)

diff --git a/src/build_vehicle_gui.cpp b/src/build_vehicle_gui.cpp
index 1d67a221f3..84ca486bbc 100644
--- a/src/build_vehicle_gui.cpp
+++ b/src/build_vehicle_gui.cpp
@@ -703,17 +703,6 @@ int DrawVehiclePurchaseInfo(int left, int right, int y, EngineID engine_number)
 	return y;
 }
 
-static void DrawVehicleEngine(VehicleType type, int x, int y, EngineID engine, SpriteID pal)
-{
-	switch (type) {
-		case VEH_TRAIN:    DrawTrainEngine(   x, y, engine, pal); break;
-		case VEH_ROAD:     DrawRoadVehEngine( x, y, engine, pal); break;
-		case VEH_SHIP:     DrawShipEngine(    x, y, engine, pal); break;
-		case VEH_AIRCRAFT: DrawAircraftEngine(x, y, engine, pal); break;
-		default: NOT_REACHED();
-	}
-}
-
 /** Engine drawing loop
  * @param type Type of vehicle (VEH_*)
  * @param x,y Where should the list start
@@ -763,7 +752,7 @@ void DrawEngineList(VehicleType type, int x, int r, int y, const GUIEngineList *
 
 		SetDParam(0, engine);
 		DrawString(x + x_offset, r, y, STR_ENGINE_NAME, engine == selected_id ? TC_WHITE : TC_BLACK);
-		DrawVehicleEngine(type, x, y + y_offset, engine, (count_location != 0 && num_engines == 0) ? PALETTE_CRASH : GetEnginePalette(engine, _local_company));
+		DrawVehicleEngine(x, y + y_offset, engine, (count_location != 0 && num_engines == 0) ? PALETTE_CRASH : GetEnginePalette(engine, _local_company));
 		if (count_location != 0) {
 			SetDParam(0, num_engines);
 			DrawString(x, count_location, y + (GetVehicleListHeight(type) == 14 ? 3 : 8), STR_TINY_BLACK_COMA, TC_FROMSTRING, SA_RIGHT);
diff --git a/src/engine_gui.cpp b/src/engine_gui.cpp
index b71b28cf3d..0ecd94d15d 100644
--- a/src/engine_gui.cpp
+++ b/src/engine_gui.cpp
@@ -72,11 +72,9 @@ static const NWidgetPart _nested_engine_preview_widgets[] = {
 	EndContainer(),
 };
 
-typedef void DrawEngineProc(int x, int y, EngineID engine, SpriteID pal);
 typedef void DrawEngineInfoProc(EngineID, int left, int right, int top, int bottom);
 
 struct DrawEngineInfo {
-	DrawEngineProc *engine_proc;
 	DrawEngineInfoProc *info_proc;
 };
 
@@ -86,10 +84,10 @@ static void DrawShipEngineInfo(EngineID engine, int left, int right, int top, in
 static void DrawAircraftEngineInfo(EngineID engine, int left, int right, int top, int bottom);
 
 static const DrawEngineInfo _draw_engine_list[4] = {
-	{ DrawTrainEngine,    DrawTrainEngineInfo    },
-	{ DrawRoadVehEngine,  DrawRoadVehEngineInfo  },
-	{ DrawShipEngine,     DrawShipEngineInfo     },
-	{ DrawAircraftEngine, DrawAircraftEngineInfo },
+	{ DrawTrainEngineInfo    },
+	{ DrawRoadVehEngineInfo  },
+	{ DrawShipEngineInfo     },
+	{ DrawAircraftEngineInfo },
 };
 
 struct EnginePreviewWindow : Window {
@@ -112,7 +110,7 @@ struct EnginePreviewWindow : Window {
 		const DrawEngineInfo *dei = &_draw_engine_list[Engine::Get(engine)->type];
 
 		int width = this->width;
-		dei->engine_proc(width >> 1, 100, engine, GetEnginePalette(engine, _local_company));
+		DrawVehicleEngine(width >> 1, 100, engine, GetEnginePalette(engine, _local_company));
 		dei->info_proc(engine, this->widget[EPW_BACKGROUND].left + 26, this->widget[EPW_BACKGROUND].right - 26, 100, 170);
 	}
 
@@ -231,6 +229,38 @@ static void DrawShipEngineInfo(EngineID engine, int left, int right, int top, in
 	DrawStringMultiLine(left, right, top, bottom, STR_ENGINE_PREVIEW_COST_MAX_SPEED_CAPACITY_RUNCOST, TC_FROMSTRING, SA_CENTER);
 }
 
+/**
+ * Draw an engine.
+ * @param x      Horizontal position to use for drawing the engine.
+ * @param y      Vertical position to use for drawing the engine.
+ * @param engine Engine to draw.
+ * @para, pal    Palette to use for drawing.
+ */
+void DrawVehicleEngine(int x, int y, EngineID engine, SpriteID pal)
+{
+	const Engine *e = Engine::Get(engine);
+
+	switch (e->type) {
+		case VEH_TRAIN:
+			DrawTrainEngine(x, y, engine, pal);
+			break;
+
+		case VEH_ROAD:
+			DrawRoadVehEngine(x, y, engine, pal);
+			break;
+
+		case VEH_SHIP:
+			DrawShipEngine(x, y, engine, pal);
+			break;
+
+		case VEH_AIRCRAFT:
+			DrawAircraftEngine(x, y, engine, pal);
+			break;
+
+		default: NOT_REACHED();
+	}
+}
+
 void DrawNewsNewVehicleAvail(Window *w, const NewsItem *ni)
 {
 	assert(ni->reftype1 == NR_ENGINE);
@@ -245,7 +275,7 @@ void DrawNewsNewVehicleAvail(Window *w, const NewsItem *ni)
 	SetDParam(0, engine);
 	DrawStringMultiLine(1, w->width - 2, 56, 88, STR_NEWS_NEW_VEHICLE_TYPE, TC_FROMSTRING, SA_CENTER);
 
-	dei->engine_proc(w->width >> 1, 88, engine, GetEnginePalette(engine, _local_company));
+	DrawVehicleEngine(w->width >> 1, 88, engine, GetEnginePalette(engine, _local_company));
 	GfxFillRect(25, 56, w->width - 56, 112, PALETTE_TO_STRUCT_GREY, FILLRECT_RECOLOUR);
 	dei->info_proc(engine, 26, w->width - 26, 100, 170);
 }
diff --git a/src/engine_gui.h b/src/engine_gui.h
index 02223b69d4..937215183c 100644
--- a/src/engine_gui.h
+++ b/src/engine_gui.h
@@ -20,4 +20,6 @@ typedef int CDECL EngList_SortTypeFunction(const void*, const void*); ///< argum
 void EngList_Sort(GUIEngineList *el, EngList_SortTypeFunction compare);  ///< qsort of the engine list
 void EngList_SortPartial(GUIEngineList *el, EngList_SortTypeFunction compare, uint begin, uint num_items); ///< qsort of specified portion of the engine list
 
+void DrawVehicleEngine(int x, int y, EngineID engine, SpriteID pal);
+
 #endif /* ENGINE_GUI_H */