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rubidium

(svn r26708) -Codechange: replace C preprocessor with all kinds of options to prevent adding certain things to the result and the sed script to remove everything that shouldn't be in the resulting nfo file but came out of the C preprocessor by a small-ish awk program. This means no more breaking if a C preprocessor decides to add more data to the processed file (like GCC's inclusion of stdc-predef.h when not passing -nostdinc). It furthermore more than halfs the time needed for the assemble step of the extra GRF compilation

/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file autoslope.h Functions related to autoslope. */

#ifndef AUTOSLOPE_H
#define AUTOSLOPE_H

#include "company_func.h"
#include "depot_func.h"
#include "tile_map.h"

/**
 * Autoslope check for tiles with an entrance on an edge.
 * E.g. depots and non-drive-through-road-stops.
 *
 * The test succeeds if the slope is not steep and at least one corner of the entrance edge is on the TileMaxZ() level.
 *
 * @note The test does not check if autoslope is enabled at all.
 *
 * @param tile The tile.
 * @param z_new New TileZ.
 * @param tileh_new New TileSlope.
 * @param entrance Entrance edge.
 * @return true iff terraforming is allowed.
 */
static inline bool AutoslopeCheckForEntranceEdge(TileIndex tile, int z_new, Slope tileh_new, DiagDirection entrance)
{
	if (GetTileMaxZ(tile) != z_new + GetSlopeMaxZ(tileh_new)) return false;
	return ((tileh_new == SLOPE_FLAT) || CanBuildDepotByTileh(entrance, tileh_new));
}

/**
 * Tests if autoslope is enabled for _current_company.
 *
 * Autoslope is disabled for town/industry construction.
 *
 * @return true iff autoslope is enabled.
 */
static inline bool AutoslopeEnabled()
{
	return (_settings_game.construction.autoslope &&
	        (_current_company < MAX_COMPANIES ||
	         (_current_company == OWNER_NONE && _game_mode == GM_EDITOR)));
}

#endif /* AUTOSLOPE_H */