using System;

namespace Hjg.Pngcs.Chunks
{
	// Token: 0x0200002D RID: 45
	public class PngChunkPHYS : PngChunkSingle
	{
		// Token: 0x17000027 RID: 39
		// (get) Token: 0x0600018C RID: 396 RVA: 0x00006AC8 File Offset: 0x00004CC8
		// (set) Token: 0x0600018D RID: 397 RVA: 0x00006AD0 File Offset: 0x00004CD0
		public long PixelsxUnitX { get; set; }

		// Token: 0x17000028 RID: 40
		// (get) Token: 0x0600018E RID: 398 RVA: 0x00006AD9 File Offset: 0x00004CD9
		// (set) Token: 0x0600018F RID: 399 RVA: 0x00006AE1 File Offset: 0x00004CE1
		public long PixelsxUnitY { get; set; }

		// Token: 0x17000029 RID: 41
		// (get) Token: 0x06000190 RID: 400 RVA: 0x00006AEA File Offset: 0x00004CEA
		// (set) Token: 0x06000191 RID: 401 RVA: 0x00006AF2 File Offset: 0x00004CF2
		public int Units { get; set; }

		// Token: 0x06000192 RID: 402 RVA: 0x00006AFB File Offset: 0x00004CFB
		public PngChunkPHYS(ImageInfo info)
			: base("pHYs", info)
		{
		}

		// Token: 0x06000193 RID: 403 RVA: 0x00006B09 File Offset: 0x00004D09
		public override PngChunk.ChunkOrderingConstraint GetOrderingConstraint()
		{
			return PngChunk.ChunkOrderingConstraint.BEFORE_IDAT;
		}

		// Token: 0x06000194 RID: 404 RVA: 0x00006B0C File Offset: 0x00004D0C
		public override ChunkRaw CreateRawChunk()
		{
			ChunkRaw chunkRaw = base.createEmptyChunk(9, true);
			PngHelperInternal.WriteInt4tobytes((int)this.PixelsxUnitX, chunkRaw.Data, 0);
			PngHelperInternal.WriteInt4tobytes((int)this.PixelsxUnitY, chunkRaw.Data, 4);
			chunkRaw.Data[8] = (byte)this.Units;
			return chunkRaw;
		}

		// Token: 0x06000195 RID: 405 RVA: 0x00006B5C File Offset: 0x00004D5C
		public override void CloneDataFromRead(PngChunk other)
		{
			PngChunkPHYS pngChunkPHYS = (PngChunkPHYS)other;
			this.PixelsxUnitX = pngChunkPHYS.PixelsxUnitX;
			this.PixelsxUnitY = pngChunkPHYS.PixelsxUnitY;
			this.Units = pngChunkPHYS.Units;
		}

		// Token: 0x06000196 RID: 406 RVA: 0x00006B94 File Offset: 0x00004D94
		public override void ParseFromRaw(ChunkRaw chunk)
		{
			if (chunk.Length != 9)
			{
				throw new PngjException("bad chunk length " + chunk);
			}
			this.PixelsxUnitX = (long)PngHelperInternal.ReadInt4fromBytes(chunk.Data, 0);
			if (this.PixelsxUnitX < 0L)
			{
				this.PixelsxUnitX += 4294967296L;
			}
			this.PixelsxUnitY = (long)PngHelperInternal.ReadInt4fromBytes(chunk.Data, 4);
			if (this.PixelsxUnitY < 0L)
			{
				this.PixelsxUnitY += 4294967296L;
			}
			this.Units = PngHelperInternal.ReadInt1fromByte(chunk.Data, 8);
		}

		// Token: 0x06000197 RID: 407 RVA: 0x00006C34 File Offset: 0x00004E34
		public double GetAsDpi()
		{
			if (this.Units != 1 || this.PixelsxUnitX != this.PixelsxUnitY)
			{
				return -1.0;
			}
			return (double)this.PixelsxUnitX * 0.0254;
		}

		// Token: 0x06000198 RID: 408 RVA: 0x00006C68 File Offset: 0x00004E68
		public double[] GetAsDpi2()
		{
			if (this.Units != 1)
			{
				return new double[] { -1.0, -1.0 };
			}
			return new double[]
			{
				(double)this.PixelsxUnitX * 0.0254,
				(double)this.PixelsxUnitY * 0.0254
			};
		}

		// Token: 0x06000199 RID: 409 RVA: 0x00006CCF File Offset: 0x00004ECF
		public void SetAsDpi(double dpi)
		{
			this.Units = 1;
			this.PixelsxUnitX = (long)(dpi / 0.0254 + 0.5);
			this.PixelsxUnitY = this.PixelsxUnitX;
		}

		// Token: 0x0600019A RID: 410 RVA: 0x00006D00 File Offset: 0x00004F00
		public void SetAsDpi2(double dpix, double dpiy)
		{
			this.Units = 1;
			this.PixelsxUnitX = (long)(dpix / 0.0254 + 0.5);
			this.PixelsxUnitY = (long)(dpiy / 0.0254 + 0.5);
		}

		// Token: 0x040000DD RID: 221
		public const string ID = "pHYs";
	}
}