1 files changed, 135 insertions, 0 deletions
diff --git a/src/animated_tile.cpp b/src/animated_tile.cpp
new file mode 100644
index 000000000..dfc0d2cb0
--- /dev/null
+++ b/src/animated_tile.cpp
@@ -0,0 +1,135 @@
+/* $Id$ */
+
+/** @file animated_tile.cpp Everything related to animated tiles. */
+
+#include "stdafx.h"
+#include "openttd.h"
+#include "saveload.h"
+#include "landscape.h"
+#include "core/alloc_func.hpp"
+#include "functions.h"
+
+/** The table/list with animated tiles. */
+TileIndex *_animated_tile_list = NULL;
+/** The number of animated tiles in the current state. */
+uint _animated_tile_count = 0;
+/** The number of slots for animated tiles allocated currently. */
+static uint _animated_tile_allocated = 0;
+
+/**
+ * Removes the given tile from the animated tile table.
+ * @param tile the tile to remove
+ */
+void DeleteAnimatedTile(TileIndex tile)
+{
+	for (TileIndex *ti = _animated_tile_list; ti < _animated_tile_list + _animated_tile_count; ti++) {
+		if (tile == *ti) {
+			/* Remove the hole
+			 * The order of the remaining elements must stay the same, otherwise the animation loop
+			 * may miss a tile; that's why we must use memmove instead of just moving the last element.
+			 */
+			memmove(ti, ti + 1, (_animated_tile_list + _animated_tile_count - (ti + 1)) * sizeof(*ti));
+			_animated_tile_count--;
+			MarkTileDirtyByTile(tile);
+			return;
+		}
+	}
+}
+
+/**
+ * Add the given tile to the animated tile table (if it does not exist
+ * on that table yet). Also increases the size of the table if necessary.
+ * @param tile the tile to make animated
+ */
+void AddAnimatedTile(TileIndex tile)
+{
+	MarkTileDirtyByTile(tile);
+
+	for (const TileIndex *ti = _animated_tile_list; ti < _animated_tile_list + _animated_tile_count; ti++) {
+		if (tile == *ti) return;
+	}
+
+	/* Table not large enough, so make it larger */
+	if (_animated_tile_count == _animated_tile_allocated) {
+		_animated_tile_allocated *= 2;
+		_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, _animated_tile_allocated);
+	}
+
+	_animated_tile_list[_animated_tile_count] = tile;
+	_animated_tile_count++;
+}
+
+/**
+ * Animate all tiles in the animated tile list, i.e.\ call AnimateTile on them.
+ */
+void AnimateAnimatedTiles()
+{
+	const TileIndex *ti = _animated_tile_list;
+	while (ti < _animated_tile_list + _animated_tile_count) {
+		const TileIndex curr = *ti;
+		AnimateTile(curr);
+		/* During the AnimateTile call, DeleteAnimatedTile could have been called,
+		 * deleting an element we've already processed and pushing the rest one
+		 * slot to the left. We can detect this by checking whether the index
+		 * in the current slot has changed - if it has, an element has been deleted,
+		 * and we should process the current slot again instead of going forward.
+		 * NOTE: this will still break if more than one animated tile is being
+		 *       deleted during the same AnimateTile call, but no code seems to
+		 *       be doing this anyway.
+		 */
+		if (*ti == curr) ++ti;
+	}
+}
+
+/**
+ * Initialize all animated tile variables to some known begin point
+ */
+void InitializeAnimatedTiles()
+{
+	_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, 256);
+	_animated_tile_count = 0;
+	_animated_tile_allocated = 256;
+}
+
+/**
+ * Save the ANIT chunk.
+ */
+static void Save_ANIT()
+{
+	SlSetLength(_animated_tile_count * sizeof(*_animated_tile_list));
+	SlArray(_animated_tile_list, _animated_tile_count, SLE_UINT32);
+}
+
+/**
+ * Load the ANIT chunk; the chunk containing the animated tiles.
+ */
+static void Load_ANIT()
+{
+	/* Before version 80 we did NOT have a variable length animated tile table */
+	if (CheckSavegameVersion(80)) {
+		/* In pre version 6, we has 16bit per tile, now we have 32bit per tile, convert it ;) */
+		SlArray(_animated_tile_list, 256, CheckSavegameVersion(6) ? (SLE_FILE_U16 | SLE_VAR_U32) : SLE_UINT32);
+
+		for (_animated_tile_count = 0; _animated_tile_count < 256; _animated_tile_count++) {
+			if (_animated_tile_list[_animated_tile_count] == 0) break;
+		}
+		return;
+	}
+
+	_animated_tile_count = SlGetFieldLength() / sizeof(*_animated_tile_list);
+
+	/* Determine a nice rounded size for the amount of allocated tiles */
+	_animated_tile_allocated = 256;
+	while (_animated_tile_allocated < _animated_tile_count) _animated_tile_allocated *= 2;
+
+	_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, _animated_tile_allocated);
+	SlArray(_animated_tile_list, _animated_tile_count, SLE_UINT32);
+}
+
+/**
+ * "Definition" imported by the saveload code to be able to load and save
+ * the animated tile table.
+ */
+extern const ChunkHandler _animated_tile_chunk_handlers[] = {
+	{ 'ANIT', Save_ANIT, Load_ANIT, CH_RIFF | CH_LAST},
+};