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rubidium

(svn r11433) -Fix: starting OpenTTD with DOS files made it look weird out of the box.
-Change: make extra sprites (the ones not in the TTD GRFs) replaceable using Action 5.
-Feature: make replacing contiguous subsets of sprites in for some types possible in Action 5.
Note to GRF authors: when you replaced OpenTTD sprites that are not from the TTD GRF files using Action A, your GRF will not have the intended result anymore as the sprite numbers have changed. You should replace the Action A with an Action 5 from now on.

/* $Id$ */

/** @file autoslope.h */

#ifndef AUTOSLOPE_H
#define AUTOSLOPE_H

#include "depot.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, uint z_new, Slope tileh_new, DiagDirection entrance)
{
	if (IsSteepSlope(tileh_new) || (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_player.
 *
 * Autoslope is disabled for town/industry construction and old ai players.
 *
 * @return true iff autoslope is enabled.
 */
static inline bool AutoslopeEnabled()
{
	return (_patches.autoslope &&
	        ((IsValidPlayer(_current_player) && !_is_old_ai_player) ||
	         (_current_player == OWNER_NONE && _game_mode == GM_EDITOR)));
}

#endif /* AUTOSLOPE_H */