Function DecrementTreeCounter

src/tree_cmd.cpp:954–963

* Decrement the tree tick counter. * The interval is scaled by map size to allow for the same density regardless of size. * Adjustment for map sizes below the standard 256 * 256 are handled earlier. * @return true if the counter was decremented past zero */

 * @return true if the counter was decremented past zero
 */
bool DecrementTreeCounter()
{
	/* Ensure _trees_tick_ctr can be decremented past zero only once for the largest map size. */
	static_assert(2 * (MAX_MAP_SIZE_BITS - MIN_MAP_SIZE_BITS) - 4 <= std::numeric_limits<uint8_t>::digits);

	/* byte underflow */
	uint8_t old_trees_tick_ctr = _trees_tick_ctr;
	_trees_tick_ctr -= Map::ScaleBySize(1);
	return old_trees_tick_ctr <= _trees_tick_ctr;
}

/**
 * Place a random tree on a random tile.