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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 landscape.h */

#ifndef LANDSCAPE_H
#define LANDSCAPE_H

enum {
	SNOW_LINE_MONTHS = 12,
	SNOW_LINE_DAYS   = 32,
};

struct SnowLine {
	byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS];
	byte highest_value;
};

bool IsSnowLineSet(void);
void SetSnowLine(byte table[SNOW_LINE_MONTHS][SNOW_LINE_DAYS]);
byte GetSnowLine(void);
byte HighestSnowLine(void);
void ClearSnowLine(void);

bool IsValidTile(TileIndex tile);

uint GetPartialZ(int x, int y, Slope corners);
uint GetSlopeZ(int x, int y);
void GetSlopeZOnEdge(Slope tileh, DiagDirection edge, int *z1, int *z2);
int GetSlopeZInCorner(Slope tileh, Corner corner);

static inline Point RemapCoords(int x, int y, int z)
{
	Point pt;
	pt.x = (y - x) * 2;
	pt.y = y + x - z;
	return pt;
}

static inline Point RemapCoords2(int x, int y)
{
	return RemapCoords(x, y, GetSlopeZ(x, y));
}

uint ApplyFoundationToSlope(Foundation f, Slope *s);
void DrawFoundation(TileInfo *ti, Foundation f);

void DoClearSquare(TileIndex tile);
void RunTileLoop();

uint32 GetTileTrackStatus(TileIndex tile, TransportType mode, uint sub_mode);
void GetAcceptedCargo(TileIndex tile, AcceptedCargo ac);
void ChangeTileOwner(TileIndex tile, PlayerID old_player, PlayerID new_player);
void AnimateTile(TileIndex tile);
void ClickTile(TileIndex tile);
void GetTileDesc(TileIndex tile, TileDesc *td);

void InitializeLandscape();
void GenerateLandscape(byte mode);

void ConvertGroundTilesIntoWaterTiles();

TileIndex AdjustTileCoordRandomly(TileIndex a, byte rng);

#endif /* LANDSCAPE_H */