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/* $Id$ */
/*
* 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 tilematrix_type.hpp Template for storing a value per area of the map. */
#ifndef TILEMATRIX_TYPE_HPP
#define TILEMATRIX_TYPE_HPP
#include "core/alloc_func.hpp"
#include "tilearea_type.h"
/**
* A simple matrix that stores one value per N*N square of the map.
* Storage is only allocated for the part of the map that has values
* assigned.
*
* @note No constructor is called for newly allocated values, you
* have to do this yourself if needed.
* @tparam T The type of the stored items.
* @tparam N Grid size.
*/
template <typename T, uint N>
class TileMatrix {
/** Allocates space for a new tile in the matrix.
* @param tile Tile to add.
*/
void AllocateStorage(TileIndex tile)
{
uint old_left = TileX(this->area.tile) / N;
uint old_top = TileY(this->area.tile) / N;
uint old_w = this->area.w / N;
uint old_h = this->area.h / N;
/* Add the square the tile is in to the tile area. We do this
* by adding top-left and bottom-right of the square. */
uint grid_x = (TileX(tile) / N) * N;
uint grid_y = (TileY(tile) / N) * N;
this->area.Add(TileXY(grid_x, grid_y));
this->area.Add(TileXY(grid_x + N - 1, grid_y + N - 1));
/* Allocate new storage. */
T *new_data = CallocT<T>(this->area.w / N * this->area.h / N);
if (old_w > 0) {
/* Copy old data if present. */
uint offs_x = old_left - TileX(this->area.tile) / N;
uint offs_y = old_top - TileY(this->area.tile) / N;
for (uint row = 0; row < old_h; row++) {
MemCpyT(&new_data[(row + offs_y) * this->area.w / N + offs_x], &this->data[row * old_w], old_w);
}
}
free(this->data);
this->data = new_data;
}
public:
static const uint GRID = N;
TileArea area; ///< Area covered by the matrix.
T *data; ///< Pointer to data array.
TileMatrix() : area(INVALID_TILE, 0, 0), data(NULL) {}
~TileMatrix()
{
free(this->data);
}
/**
* Get the total covered area.
* @return The area covered by the matrix.
*/
const TileArea& GetArea() const
{
return this->area;
}
/**
* Get the area of the matrix square that contains a specific tile.
* @param tile The tile to get the map area for.
* @param extend Extend the area by this many squares on all sides.
* @return Tile area containing the tile.
*/
static TileArea GetAreaForTile(TileIndex tile, uint extend = 0)
{
uint tile_x = (TileX(tile) / N) * N;
uint tile_y = (TileY(tile) / N) * N;
uint w = N, h = N;
w += min(extend * N, tile_x);
h += min(extend * N, tile_y);
tile_x -= min(extend * N, tile_x);
tile_y -= min(extend * N, tile_y);
w += min(extend * N, MapSizeX() - tile_x - w);
h += min(extend * N, MapSizeY() - tile_y - h);
return TileArea(TileXY(tile_x, tile_y), w, h);
}
/**
* Extend the coverage area to include a tile.
* @param tile The tile to include.
*/
void Add(TileIndex tile)
{
if (!this->area.Contains(tile)) {
this->AllocateStorage(tile);
}
}
/**
* Get the value associated to a tile index.
* @param tile The tile to get the value for.
* @return Pointer to the value.
*/
T *Get(TileIndex tile)
{
this->Add(tile);
tile -= this->area.tile;
uint x = TileX(tile) / N;
uint y = TileY(tile) / N;
return &this->data[y * this->area.w / N + x];
}
/** Array access operator, see #Get. */
inline T &operator[](TileIndex tile)
{
return *this->Get(tile);
}
};
#endif /* TILEMATRIX_TYPE_HPP */
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