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r28815:5e58b8dec74d 2.3 KiB text/x-c Show Annotation Show as Raw Download as Raw

Peter Nelson

Codechange: Off-by-one in colour gradient initialisation.

Remap sprites start with a count byte followed by 256 entries, but
SetupColoursAndInitialWindow did not take account of this extra byte and
therefore started at palette index 0xC5 instead of 0xC6. This caused the
first colour of each gradient to be incorrect and all shades were actually
1 step lower in the gradient than indicated.

/*
 * 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 map_type.h Types related to maps. */

#ifndef MAP_TYPE_H
#define MAP_TYPE_H

/**
 * An offset value between two tiles.
 *
 * This value is used for the difference between
 * two tiles. It can be added to a TileIndex to get
 * the resulting TileIndex of the start tile applied
 * with this saved difference.
 *
 * @see TileDiffXY(int, int)
 */
typedef int32_t TileIndexDiff;

/**
 * A pair-construct of a TileIndexDiff.
 *
 * This can be used to save the difference between to
 * tiles as a pair of x and y value.
 */
struct TileIndexDiffC {
	int16_t x;        ///< The x value of the coordinate
	int16_t y;        ///< The y value of the coordinate
};

/** Minimal and maximal map width and height */
static const uint MIN_MAP_SIZE_BITS = 6;                       ///< Minimal size of map is equal to 2 ^ MIN_MAP_SIZE_BITS
static const uint MAX_MAP_SIZE_BITS = 12;                      ///< Maximal size of map is equal to 2 ^ MAX_MAP_SIZE_BITS
static const uint MIN_MAP_SIZE      = 1U << MIN_MAP_SIZE_BITS; ///< Minimal map size = 64
static const uint MAX_MAP_SIZE      = 1U << MAX_MAP_SIZE_BITS; ///< Maximal map size = 4096

/**
 * Approximation of the length of a straight track, relative to a diagonal
 * track (ie the size of a tile side).
 *
 * \#defined instead of const so it can
 * stay integer. (no runtime float operations) Is this needed?
 * Watch out! There are _no_ brackets around here, to prevent intermediate
 * rounding! Be careful when using this!
 * This value should be sqrt(2)/2 ~ 0.7071
 */
#define STRAIGHT_TRACK_LENGTH 7071/10000

/** Argument for CmdLevelLand describing what to do. */
enum LevelMode : byte {
	LM_LEVEL, ///< Level the land.
	LM_LOWER, ///< Lower the land.
	LM_RAISE, ///< Raise the land.
};

#endif /* MAP_TYPE_H */