7 #include "tile_cmd.h"

    10 #include "saveload.h"

   426 

   427 /** The table/list with animated tiles. */

   428 TileIndex *_animated_tile_list = NULL;

   429 /** The number of animated tiles in the current state. */

   430 uint _animated_tile_count = 0;

   431 /** The number of slots for animated tiles allocated currently. */

   432 static uint _animated_tile_allocated = 0;

   433 

   434 /**

   435  * Removes the given tile from the animated tile table.

   436  * @param tile the tile to remove

   437  */

   438 void DeleteAnimatedTile(TileIndex tile)

   439 {

   440 	for (TileIndex *ti = _animated_tile_list; ti < _animated_tile_list + _animated_tile_count; ti++) {

   441 		if (tile == *ti) {

   442 			/* Remove the hole

   443 			 * The order of the remaining elements must stay the same, otherwise the animation loop

   444 			 * may miss a tile; that's why we must use memmove instead of just moving the last element.

   445 			 */

   446 			memmove(ti, ti + 1, (_animated_tile_list + _animated_tile_count - (ti + 1)) * sizeof(*ti));

   447 			_animated_tile_count--;

   448 			MarkTileDirtyByTile(tile);

   449 			return;

   450 		}

   451 	}

   452 }

   453 

   454 /**

   455  * Add the given tile to the animated tile table (if it does not exist

   456  * on that table yet). Also increases the size of the table if necessary.

   457  * @param tile the tile to make animated

   458  */

   459 void AddAnimatedTile(TileIndex tile)

   460 {

   461 	MarkTileDirtyByTile(tile);

   462 

   463 	for (const TileIndex *ti = _animated_tile_list; ti < _animated_tile_list + _animated_tile_count; ti++) {

   464 		if (tile == *ti) return;

   465 	}

   466 

   467 	/* Table not large enough, so make it larger */

   468 	if (_animated_tile_count == _animated_tile_allocated) {

   469 		_animated_tile_allocated *= 2;

   470 		_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, _animated_tile_allocated);

   471 	}

   472 

   473 	_animated_tile_list[_animated_tile_count] = tile;

   474 	_animated_tile_count++;

   475 }

   476 

   477 /**

   478  * Animate all tiles in the animated tile list, i.e.\ call AnimateTile on them.

   479  */

   480 void AnimateAnimatedTiles()

   481 {

   482 	const TileIndex *ti = _animated_tile_list;

   483 	while (ti < _animated_tile_list + _animated_tile_count) {

   484 		const TileIndex curr = *ti;

   485 		AnimateTile(curr);

   486 		/* During the AnimateTile call, DeleteAnimatedTile could have been called,

   487 		 * deleting an element we've already processed and pushing the rest one

   488 		 * slot to the left. We can detect this by checking whether the index

   489 		 * in the current slot has changed - if it has, an element has been deleted,

   490 		 * and we should process the current slot again instead of going forward.

   491 		 * NOTE: this will still break if more than one animated tile is being

   492 		 *       deleted during the same AnimateTile call, but no code seems to

   493 		 *       be doing this anyway.

   494 		 */

   495 		if (*ti == curr) ++ti;

   496 	}

   497 }

   498 

   499 /**

   500  * Initialize all animated tile variables to some known begin point

   501  */

   502 void InitializeAnimatedTiles()

   503 {

   504 	_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, 256);

   505 	_animated_tile_count = 0;

   506 	_animated_tile_allocated = 256;

   507 }

   508 

   509 /**

   510  * Save the ANIT chunk.

   511  */

   512 static void Save_ANIT()

   513 {

   514 	SlSetLength(_animated_tile_count * sizeof(*_animated_tile_list));

   515 	SlArray(_animated_tile_list, _animated_tile_count, SLE_UINT32);

   516 }

   517 

   518 /**

   519  * Load the ANIT chunk; the chunk containing the animated tiles.

   520  */

   521 static void Load_ANIT()

   522 {

   523 	/* Before version 80 we did NOT have a variable length animated tile table */

   524 	if (CheckSavegameVersion(80)) {

   525 		/* In pre version 6, we has 16bit per tile, now we have 32bit per tile, convert it ;) */

   526 		SlArray(_animated_tile_list, 256, CheckSavegameVersion(6) ? (SLE_FILE_U16 | SLE_VAR_U32) : SLE_UINT32);

   527 

   528 		for (_animated_tile_count = 0; _animated_tile_count < 256; _animated_tile_count++) {

   529 			if (_animated_tile_list[_animated_tile_count] == 0) break;

   530 		}

   531 		return;

   532 	}

   533 

   534 	_animated_tile_count = SlGetFieldLength() / sizeof(*_animated_tile_list);

   535 

   536 	/* Determine a nice rounded size for the amount of allocated tiles */

   537 	_animated_tile_allocated = 256;

   538 	while (_animated_tile_allocated < _animated_tile_count) _animated_tile_allocated *= 2;

   539 

   540 	_animated_tile_list = ReallocT<TileIndex>(_animated_tile_list, _animated_tile_allocated);

   541 	SlArray(_animated_tile_list, _animated_tile_count, SLE_UINT32);

   542 }

   543 

   544 /**

   545  * "Definition" imported by the saveload code to be able to load and save

   546  * the animated tile table.

   547  */

   548 extern const ChunkHandler _animated_tile_chunk_handlers[] = {

   549 	{ 'ANIT', Save_ANIT, Load_ANIT, CH_RIFF | CH_LAST},

   550 };