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Exposes a set of tiles for a TileSet resource.
Tiles in a source are indexed with two IDs, coordinates ID (of type Vector2i) and an alternative ID (of type int), named according to their use in the TileSetAtlasSource class.
Depending on the TileSet source type, those IDs might have restrictions on their values, this is why the base TileSetSource class only exposes getters for them.
You can iterate over all tiles exposed by a TileSetSource by first iterating over coordinates IDs using get_tiles_count() and get_tile_id(), then over alternative IDs using get_alternative_tiles_count() and get_alternative_tile_id().
Warning: TileSetSource can only be added to one TileSet at the same time. Calling TileSet.add_source() on a second TileSet will remove the source from the first one.
Returns the alternative ID for the tile with coordinates ID atlas_coords at index index.
Returns the number of alternatives tiles for the coordinates ID atlas_coords.
For TileSetAtlasSource, this always return at least 1, as the base tile with ID 0 is always part of the alternatives list.
Returns -1 if there is not tile at the given coords.
Returns the tile coordinates ID of the tile with index index.
Returns how many tiles this atlas source defines (not including alternative tiles).
Returns if the base tile at coordinates atlas_coords has an alternative with ID alternative_tile.
Returns if this atlas has a tile with coordinates ID atlas_coords.
