(svn r25170) [1.3] -Backport from trunk:

- Fix: Original train and rv acceleration did no longer respect bridge speed limits [FS#5523] (r25167)
- Fix: [Win32] Do not statically link to SHGetFolderPath as it may not exist, and improve its emulation [FS#5522] (r25155, r25153)
- Fix: [Win32] Do not store invalid paths in the search path list (r25154)
- Fix: Remove stray reservation from savegames affected by FS#5510 et al. upon loading [FS#5520] (r25152)
- Fix: [Script] XXBase::Chance function did not work for large values (>65535) [FS#5517] (r25148)

src/fontcache.cpp

@@ -173,7 +173,7 @@ static FT_Error GetFontByFaceName(const char *font_name, FT_Face *face)
 		}
 	}
 
-	if (!SUCCEEDED(SHGetFolderPath(NULL, CSIDL_FONTS, NULL, SHGFP_TYPE_CURRENT, vbuffer))) {
+	if (!SUCCEEDED(OTTDSHGetFolderPath(NULL, CSIDL_FONTS, NULL, SHGFP_TYPE_CURRENT, vbuffer))) {
 		DEBUG(freetype, 0, "SHGetFolderPath cannot return fonts directory");
 		goto folder_error;
 	}

src/os/windows/win32.cpp

@@ -17,6 +17,7 @@
 #include "../../fios.h"
 #include <windows.h>
 #include <fcntl.h>
+#include <regstr.h>
 #include <shlobj.h> /* SHGetFolderPath */
 #include <Shellapi.h>
 #include "win32.h"
@@ -505,19 +506,25 @@ void DetermineBasePaths(const char *exe)
 	char tmp[MAX_PATH];
 	TCHAR path[MAX_PATH];
 #ifdef WITH_PERSONAL_DIR
-	SHGetFolderPath(NULL, CSIDL_PERSONAL, NULL, SHGFP_TYPE_CURRENT, path);
+	if (SUCCEEDED(OTTDSHGetFolderPath(NULL, CSIDL_PERSONAL, NULL, SHGFP_TYPE_CURRENT, path))) {
 		strecpy(tmp, WIDE_TO_MB_BUFFER(path, tmp, lengthof(tmp)), lastof(tmp));
 		AppendPathSeparator(tmp, MAX_PATH);
 		ttd_strlcat(tmp, PERSONAL_DIR, MAX_PATH);
 		AppendPathSeparator(tmp, MAX_PATH);
 		_searchpaths[SP_PERSONAL_DIR] = strdup(tmp);
+	} else {
+		_searchpaths[SP_PERSONAL_DIR] = NULL;
+	}
 
-	SHGetFolderPath(NULL, CSIDL_COMMON_DOCUMENTS, NULL, SHGFP_TYPE_CURRENT, path);
+	if (SUCCEEDED(OTTDSHGetFolderPath(NULL, CSIDL_COMMON_DOCUMENTS, NULL, SHGFP_TYPE_CURRENT, path))) {
 		strecpy(tmp, WIDE_TO_MB_BUFFER(path, tmp, lengthof(tmp)), lastof(tmp));
 		AppendPathSeparator(tmp, MAX_PATH);
 		ttd_strlcat(tmp, PERSONAL_DIR, MAX_PATH);
 		AppendPathSeparator(tmp, MAX_PATH);
 		_searchpaths[SP_SHARED_DIR] = strdup(tmp);
+	} else {
+		_searchpaths[SP_SHARED_DIR] = NULL;
+	}
 #else
 	_searchpaths[SP_PERSONAL_DIR] = NULL;
 	_searchpaths[SP_SHARED_DIR]   = NULL;
@@ -726,8 +733,11 @@ HRESULT OTTDSHGetFolderPath(HWND hwnd, int csidl, HANDLE hToken, DWORD dwFlags,
 #else
 # define W(x) x "A"
 #endif
+		/* The function lives in shell32.dll for all current Windows versions, but it first started to appear in SHFolder.dll. */
+		if (!LoadLibraryList((Function*)&SHGetFolderPath, "shell32.dll\0" W("SHGetFolderPath") "\0\0")) {
 			if (!LoadLibraryList((Function*)&SHGetFolderPath, "SHFolder.dll\0" W("SHGetFolderPath") "\0\0")) {
-			DEBUG(misc, 0, "Unable to load " W("SHGetFolderPath") "from SHFolder.dll");
+				DEBUG(misc, 0, "Unable to load " W("SHGetFolderPath") "from either shell32.dll or SHFolder.dll");
+			}
 		}
 #undef W
 		first_time = false;
@@ -752,6 +762,17 @@ HRESULT OTTDSHGetFolderPath(HWND hwnd, int csidl, HANDLE hToken, DWORD dwFlags,
 
 				return (HRESULT)0;
 
+			case CSIDL_PERSONAL:
+			case CSIDL_COMMON_DOCUMENTS: {
+				HKEY key;
+				if (RegOpenKeyEx(csidl == CSIDL_PERSONAL ? HKEY_CURRENT_USER : HKEY_LOCAL_MACHINE, REGSTR_PATH_SPECIAL_FOLDERS, 0, KEY_READ, &key) != ERROR_SUCCESS) break;
+				DWORD len = MAX_PATH;
+				ret = RegQueryValueEx(key, csidl == CSIDL_PERSONAL ? _T("Personal") : _T("Common Documents"), NULL, NULL, (LPBYTE)pszPath, &len);
+				RegCloseKey(key);
+				if (ret == ERROR_SUCCESS) return (HRESULT)0;
+				break;
+			}
+
 			/* XXX - other types to go here when needed... */
 		}
 	}

src/os/windows/win32.h

@@ -40,12 +40,6 @@ extern uint _codepage; // local code-page in the system @see win32_v.cpp:WM_INPU
 # define WIDE_TO_MB_BUFFER(str, buffer, buflen) (str)
 #endif
 
-/* Override SHGetFolderPath with our custom implementation */
-#if defined(SHGetFolderPath)
-#undef SHGetFolderPath
-#endif
-#define SHGetFolderPath OTTDSHGetFolderPath
-
 HRESULT OTTDSHGetFolderPath(HWND, int, HANDLE, DWORD, LPTSTR);
 
 #if defined(__MINGW32__)

src/roadveh_cmd.cpp

@@ -429,18 +429,18 @@ void RoadVehicle::UpdateDeltaXY(Direction direction)
  */
 inline int RoadVehicle::GetCurrentMaxSpeed() const
 {
-	if (_settings_game.vehicle.roadveh_acceleration_model == AM_ORIGINAL) return min(this->vcache.cached_max_speed, this->current_order.max_speed * 2);
-
 	int max_speed = this->vcache.cached_max_speed;
 
 	/* Limit speed to 50% while reversing, 75% in curves. */
 	for (const RoadVehicle *u = this; u != NULL; u = u->Next()) {
+		if (_settings_game.vehicle.roadveh_acceleration_model == AM_REALISTIC) {
 			if (this->state <= RVSB_TRACKDIR_MASK && IsReversingRoadTrackdir((Trackdir)this->state)) {
 				max_speed = this->vcache.cached_max_speed / 2;
 				break;
 			} else if ((u->direction & 1) == 0) {
 				max_speed = this->vcache.cached_max_speed * 3 / 4;
 			}
+		}
 
 		/* Vehicle is on the middle part of a bridge. */
 		if (u->state == RVSB_WORMHOLE && !(u->vehstatus & VS_HIDDEN)) {

src/saveload/afterload.cpp

@@ -2770,6 +2770,14 @@ bool AfterLoadGame()
 				v->acceleration = avi->acceleration;
 			}
 		}
+
+		/* Blocked tiles could be reserved due to a bug, which causes
+		 * other places to assert upon e.g. station reconstruction. */
+		for (TileIndex t = 0; t < map_size; t++) {
+			if (HasStationTileRail(t) && IsStationTileBlocked(t)) {
+				SetRailStationReservation(t, false);
+			}
+		}
 	}
 
 	/* Road stops is 'only' updating some caches */

src/script/api/script_base.cpp

@@ -44,7 +44,7 @@
 /* static */ bool ScriptBase::Chance(uint out, uint max)
 {
 	EnforcePrecondition(false, out <= max);
-	return (uint16)Rand() <= (uint16)((65535 * out) / max);
+	return ScriptBase::RandRange(max) < out;
 }
 
 /* static */ bool ScriptBase::ChanceItem(int unused_param, uint out, uint max)

src/script/api/script_base.hpp

@@ -70,6 +70,7 @@ public:
 	 * @param unused_param This parameter is not used, but is needed to work with lists.
 	 * @param out How many times it should return true.
 	 * @param max Out of this many times.
+	 * @pre \a out is at most equal to \a max.
 	 * @return True if the chance worked out.
 	 */
 	static bool ChanceItem(int unused_param, uint out, uint max);

src/train_cmd.cpp

@@ -371,10 +371,11 @@ int Train::GetCurveSpeedLimit() const
  */
 int Train::GetCurrentMaxSpeed() const
 {
-	if (_settings_game.vehicle.train_acceleration_model == AM_ORIGINAL) return min(this->gcache.cached_max_track_speed, this->current_order.max_speed);
+	int max_speed = _settings_game.vehicle.train_acceleration_model == AM_ORIGINAL ?
+			this->gcache.cached_max_track_speed :
+			this->tcache.cached_max_curve_speed;
 
-	int max_speed = this->tcache.cached_max_curve_speed;
+	if (_settings_game.vehicle.train_acceleration_model == AM_REALISTIC && IsRailStationTile(this->tile)) {
-	if (IsRailStationTile(this->tile)) {
 		StationID sid = GetStationIndex(this->tile);
 		if (this->current_order.ShouldStopAtStation(this, sid)) {
 			int station_ahead;
@@ -400,7 +401,7 @@ int Train::GetCurrentMaxSpeed() const
 	}
 
 	for (const Train *u = this; u != NULL; u = u->Next()) {
-		if (u->track == TRACK_BIT_DEPOT) {
+		if (_settings_game.vehicle.train_acceleration_model == AM_REALISTIC && u->track == TRACK_BIT_DEPOT) {
 			max_speed = min(max_speed, 61);
 			break;
 		}
@@ -2775,7 +2776,7 @@ int Train::UpdateSpeed()
 	switch (_settings_game.vehicle.train_acceleration_model) {
 		default: NOT_REACHED();
 		case AM_ORIGINAL:
-			return this->DoUpdateSpeed(this->acceleration * (this->GetAccelerationStatus() == AS_BRAKE ? -4 : 2), 0, min(this->gcache.cached_max_track_speed, this->current_order.max_speed));
+			return this->DoUpdateSpeed(this->acceleration * (this->GetAccelerationStatus() == AS_BRAKE ? -4 : 2), 0, this->GetCurrentMaxSpeed());
 
 		case AM_REALISTIC:
 			return this->DoUpdateSpeed(this->GetAcceleration(), this->GetAccelerationStatus() == AS_BRAKE ? 0 : 2, this->GetCurrentMaxSpeed());