using System;
using System.Collections.Generic;

namespace UnityEngine.UI
{
	// Token: 0x02000048 RID: 72
	public static class FontUpdateTracker
	{
		// Token: 0x06000223 RID: 547 RVA: 0x0000AFB8 File Offset: 0x000093B8
		public static void TrackText(Text t)
		{
			if (!(t.font == null))
			{
				HashSet<Text> hashSet;
				FontUpdateTracker.m_Tracked.TryGetValue(t.font, out hashSet);
				if (hashSet == null)
				{
					if (FontUpdateTracker.m_Tracked.Count == 0)
					{
						Font.textureRebuilt += FontUpdateTracker.RebuildForFont;
					}
					hashSet = new HashSet<Text>();
					FontUpdateTracker.m_Tracked.Add(t.font, hashSet);
				}
				if (!hashSet.Contains(t))
				{
					hashSet.Add(t);
				}
			}
		}

		// Token: 0x06000224 RID: 548 RVA: 0x0000B054 File Offset: 0x00009454
		private static void RebuildForFont(Font f)
		{
			HashSet<Text> hashSet;
			FontUpdateTracker.m_Tracked.TryGetValue(f, out hashSet);
			if (hashSet != null)
			{
				foreach (Text text in hashSet)
				{
					text.FontTextureChanged();
				}
			}
		}

		// Token: 0x06000225 RID: 549 RVA: 0x0000B0C8 File Offset: 0x000094C8
		public static void UntrackText(Text t)
		{
			if (!(t.font == null))
			{
				HashSet<Text> hashSet;
				FontUpdateTracker.m_Tracked.TryGetValue(t.font, out hashSet);
				if (hashSet != null)
				{
					hashSet.Remove(t);
					if (hashSet.Count == 0)
					{
						FontUpdateTracker.m_Tracked.Remove(t.font);
						if (FontUpdateTracker.m_Tracked.Count == 0)
						{
							Font.textureRebuilt -= FontUpdateTracker.RebuildForFont;
						}
					}
				}
			}
		}

		// Token: 0x04000104 RID: 260
		private static Dictionary<Font, HashSet<Text>> m_Tracked = new Dictionary<Font, HashSet<Text>>();
	}
}