TileSets do not support tilesets which do have one image per tile

[LokiMidgard]

In case you load an tileset that has one image per tile and tileset has no texture set, a Nullreference exception is thrown and the build fails.

This fails since it Image in tileset is null

MonoGame.Extended/src/cs/MonoGame.Extended.Content.Pipeline/Tiled/TiledMapTilesetImporter.cs

Line 42 in 1d8ea44

tileset.Image.Source = Path.Combine(Path.GetDirectoryName(filePath), tileset.Image.Source);

There are more problems later on:

MonoGame.Extended/src/cs/MonoGame.Extended.Content.Pipeline/Tiled/TiledMapTilesetProcessor.cs

Lines 19 to 27 in 1d8ea44

	// Build the Texture2D asset and load it as it will be saved as part of this tileset file.
	//var externalReference = new ExternalReference<Texture2DContent>(tileset.Image.Source);
	var parameters = new OpaqueDataDictionary
	{
	{ "ColorKeyColor", tileset.Image.TransparentColor },
	{ "ColorKeyEnabled", true }
	};
	//tileset.Image.ContentRef = context.BuildAsset<Texture2DContent, Texture2DContent>(externalReference, "", parameters, "", "");
	contentItem.BuildExternalReference<Texture2DContent>(context, tileset.Image.Source, parameters);

MonoGame.Extended/src/cs/MonoGame.Extended.Content.Pipeline/Tiled/TiledMapTilesetWriter.cs

Line 33 in 1d8ea44

var externalReference = externalReferenceRepository.GetExternalReference<Texture2DContent>(tileset.Image.Source);

Should the importer or processor stitch the images together?

Adding each tile an image seems not the best aproach looking at the renderer...