private static SpriteSheet[] MergeSpriteSheets(SpriteSheet[] originalSheets, SpriteSheet[] newSheets)
{
Dictionary<string, List<string>> prefixDirectLookup = new Dictionary<string, List<string>>();
List<string> order = new List<string>();
originalSheets = originalSheets ?? new SpriteSheet[0];
newSheets = newSheets ?? new SpriteSheet[0];
foreach (SpriteSheet sheet in originalSheets.Concat<SpriteSheet>(newSheets))
{
if (sheet.Id == null)
{
throw new InvalidOperationException("Sprite sheet is missing an ID.");
}
if (!prefixDirectLookup.ContainsKey(sheet.Id))
{
prefixDirectLookup.Add(sheet.Id, new List<string>());
order.Add(sheet.Id);
}
prefixDirectLookup[sheet.Id].AddRange(sheet.Prefixes);
}
return order
.Select<string, SpriteSheet>(
id => new SpriteSheet()
{
Id = id,
Prefixes = prefixDirectLookup[id].ToArray()
})
.ToArray();
}
