using System;

namespace Hjg.Pngcs.Chunks
{
	// Token: 0x02000015 RID: 21
	public class PngChunkHIST : PngChunkSingle
	{
		// Token: 0x06000099 RID: 153 RVA: 0x00003A7E File Offset: 0x00001C7E
		public PngChunkHIST(ImageInfo info)
			: base(PngChunkHIST.ID, info)
		{
		}

		// Token: 0x0600009A RID: 154 RVA: 0x00003A98 File Offset: 0x00001C98
		public override PngChunk.ChunkOrderingConstraint GetOrderingConstraint()
		{
			return PngChunk.ChunkOrderingConstraint.AFTER_PLTE_BEFORE_IDAT;
		}

		// Token: 0x0600009B RID: 155 RVA: 0x00003A9C File Offset: 0x00001C9C
		public override ChunkRaw CreateRawChunk()
		{
			if (!this.ImgInfo.Indexed)
			{
				throw new PngjException("only indexed images accept a HIST chunk");
			}
			ChunkRaw chunkRaw = base.createEmptyChunk(this.hist.Length * 2, true);
			for (int i = 0; i < this.hist.Length; i++)
			{
				PngHelperInternal.WriteInt2tobytes(this.hist[i], chunkRaw.Data, i * 2);
			}
			return chunkRaw;
		}

		// Token: 0x0600009C RID: 156 RVA: 0x00003B00 File Offset: 0x00001D00
		public override void ParseFromRaw(ChunkRaw c)
		{
			if (!this.ImgInfo.Indexed)
			{
				throw new PngjException("only indexed images accept a HIST chunk");
			}
			int num = c.Data.Length / 2;
			this.hist = new int[num];
			for (int i = 0; i < this.hist.Length; i++)
			{
				this.hist[i] = PngHelperInternal.ReadInt2fromBytes(c.Data, i * 2);
			}
		}

		// Token: 0x0600009D RID: 157 RVA: 0x00003B68 File Offset: 0x00001D68
		public override void CloneDataFromRead(PngChunk other)
		{
			PngChunkHIST pngChunkHIST = (PngChunkHIST)other;
			this.hist = new int[pngChunkHIST.hist.Length];
			Array.Copy(pngChunkHIST.hist, 0, this.hist, 0, pngChunkHIST.hist.Length);
		}

		// Token: 0x0600009E RID: 158 RVA: 0x00003BAA File Offset: 0x00001DAA
		public int[] GetHist()
		{
			return this.hist;
		}

		// Token: 0x0600009F RID: 159 RVA: 0x00003BB2 File Offset: 0x00001DB2
		public void SetHist(int[] hist)
		{
			this.hist = hist;
		}

		// Token: 0x04000054 RID: 84
		public static readonly string ID = "hIST";

		// Token: 0x04000055 RID: 85
		private int[] hist = new int[0];
	}
}