Codechange: Extend industry cargo history to 24 years.

Monthly data is stored for the current 24 months. Quarterly data is stored for a further 2-6 years. Yearly data is stored for a further 6-24 years.
2025-07-18 22:28:09 +01:00
parent 8675d7b498
commit d09dfd843c
8 changed files with 287 additions and 27 deletions
@@ -0,0 +1,65 @@
+/*
+ * 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 history.cpp Implementation of functions for storing historical data. */
+
+#include "../stdafx.h"
+
+#include "../core/bitmath_func.hpp"
+#include "history_type.hpp"
+#include "history_func.hpp"
+
+#include "../safeguards.h"
+
+/**
+ * Update mask of valid records for a historical data.
+ * @note Call only for the largest history range sub-division.
+ * @param[in,out] valid_history Valid history records.
+ * @param hr History range to update mask for.
+ * @param cur_month Current economy month.
+ */
+void UpdateValidHistory(ValidHistoryMask &valid_history, const HistoryRange &hr, uint cur_month)
+{
+	/* Update for subdivisions first. */
+	if (hr.hr != nullptr) UpdateValidHistory(valid_history, *hr.hr, cur_month);
+
+	/* No need to update if our last entry is marked valid. */
+	if (HasBit(valid_history, hr.last - 1)) return;
+	/* Is it the right time for this history range? */
+	if (cur_month % hr.total_division != 0) return;
+	/* Is the previous history range valid yet? */
+	if (hr.division != 1 && !HasBit(valid_history, hr.first - hr.division)) return;
+
+	SB(valid_history, hr.first, hr.records, GB(valid_history, hr.first, hr.records) << 1ULL | 1ULL);
+}
+
+/**
+ * Test if history data is valid, without extracting data.
+ * @param valid_history Mask of valid history records.
+ * @param hr History range to test.
+ * @param age Age of data to test.
+ * @return True iff the data for history range and age is valid.
+ */
+bool IsValidHistory(ValidHistoryMask valid_history, const HistoryRange &hr, uint age)
+{
+	if (hr.hr == nullptr) {
+		if (age < hr.periods) {
+			uint slot = hr.first + age;
+			return HasBit(valid_history, slot);
+		}
+	} else {
+		if (age * hr.division < static_cast<uint>(hr.hr->periods - hr.division)) {
+			uint start = age * hr.division + ((TimerGameEconomy::month / hr.hr->division) % hr.division);
+			return IsValidHistory(valid_history, *hr.hr, start);
+		}
+		if (age < hr.periods) {
+			uint slot = hr.first + age - ((hr.hr->periods / hr.division) - 1);
+			return HasBit(valid_history, slot);
+		}
+	}
+	return false;
+}