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Poddav
363
GameRes/ImageTIFF.cs
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363
GameRes/ImageTIFF.cs
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//! \file ImageTIFF.cs
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//! \date Mon Jul 07 06:39:45 2014
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//! \brief TIFF image implementation.
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//
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using System;
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using System.IO;
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using System.Text;
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using System.ComponentModel.Composition;
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using System.Windows.Media.Imaging;
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using GameRes.Utility;
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namespace GameRes
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{
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#if DEBUG
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// FIXME
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// .Net TIFF encoder messes up transparency,
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// therefore this class is disabled in release build
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[Export(typeof(ImageFormat))]
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#endif
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public class TifFormat : ImageFormat
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{
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public override string Tag { get { return "TIFF"; } }
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public override string Description { get { return "Tagged Image File Format"; } }
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public override uint Signature { get { return 0; } }
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public TifFormat ()
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{
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Extensions = new string[] { "tif", "tiff" };
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Signatures = new uint[] { 0x002a4949, 0x2a004d4d };
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}
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public override ImageData Read (Stream file, ImageMetaData info)
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{
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var decoder = new TiffBitmapDecoder (file,
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BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
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var frame = decoder.Frames[0];
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frame.Freeze();
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return new ImageData (frame, info);
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}
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public override void Write (Stream file, ImageData image)
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{
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var encoder = new TiffBitmapEncoder();
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encoder.Compression = TiffCompressOption.Zip;
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encoder.Frames.Add (BitmapFrame.Create (image.Bitmap));
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encoder.Save (file);
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}
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private delegate uint UInt32Reader();
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private delegate ushort UInt16Reader();
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enum TIFF
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{
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ImageWidth = 0x100,
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ImageHeight = 0x101,
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BitsPerSample = 0x102,
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Compression = 0x103,
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SamplesPerPixel = 0x115,
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XResolution = 0x11a,
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YResolution = 0x11b,
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XPosition = 0x11e,
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YPosition = 0x11f,
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}
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enum TagType
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{
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Byte = 1,
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Ascii = 2,
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Short = 3,
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Long = 4,
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Rational = 5,
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SByte = 6,
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Undefined = 7,
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SShort = 8,
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SLong = 9,
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SRational = 10,
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Float = 11,
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Double = 12,
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LastKnown = Double,
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}
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enum MetaParsed
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{
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None = 0,
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Width = 1,
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Height = 2,
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BPP = 4,
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PosX = 8,
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PosY = 16,
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Sufficient = Width|Height|BPP,
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Complete = Sufficient|PosX|PosY,
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}
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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using (var file = new Parser (stream))
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return file.ReadMetaData();
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}
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public class Parser : IDisposable
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{
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private BinaryReader m_file;
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private readonly bool m_is_bigendian;
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private readonly uint m_first_ifd;
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private readonly uint[] m_type_size = { 0, 1, 1, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8 };
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private delegate ushort UInt16Reader ();
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private delegate uint UInt32Reader ();
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private delegate ulong UInt64Reader ();
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UInt16Reader ReadUInt16;
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UInt32Reader ReadUInt32;
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UInt64Reader ReadUInt64;
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public Parser (Stream file)
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{
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m_file = new ArcView.Reader (file);
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uint signature = m_file.ReadUInt32();
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m_is_bigendian = 0x2a004d4d == signature;
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if (m_is_bigendian)
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{
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ReadUInt16 = () => Binary.BigEndian (m_file.ReadUInt16());
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ReadUInt32 = () => Binary.BigEndian (m_file.ReadUInt32());
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ReadUInt64 = () => Binary.BigEndian (m_file.ReadUInt64());
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}
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else
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{
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ReadUInt16 = () => m_file.ReadUInt16();
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ReadUInt32 = () => m_file.ReadUInt32();
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ReadUInt64 = () => m_file.ReadUInt64();
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}
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m_first_ifd = ReadUInt32();
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}
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public long FindLastIFD ()
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{
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uint ifd = m_first_ifd;
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for (;;)
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{
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m_file.BaseStream.Position = ifd;
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uint tag_count = ReadUInt16();
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ifd += 2 + tag_count*12;
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uint ifd_next = ReadUInt32();
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if (0 == ifd_next)
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break;
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if (ifd_next == ifd || ifd_next >= m_file.BaseStream.Length)
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return -1;
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ifd = ifd_next;
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}
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return ifd;
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}
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public ImageMetaData ReadMetaData ()
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{
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MetaParsed parsed = MetaParsed.None;
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int width = 0, height = 0, bpp = 0, pos_x = 0, pos_y = 0;
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uint ifd = m_first_ifd;
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while (ifd != 0 && parsed != MetaParsed.Complete)
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{
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m_file.BaseStream.Position = ifd;
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uint tag_count = ReadUInt16();
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ifd += 2;
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for (uint i = 0; i < tag_count && parsed != MetaParsed.Complete; ++i)
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{
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ushort tag = ReadUInt16();
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TagType type = (TagType)ReadUInt16();
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uint count = ReadUInt32();
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if (0 != count && 0 != type && type <= TagType.LastKnown)
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{
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switch ((TIFF)tag)
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{
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case TIFF.ImageWidth:
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if (1 == count)
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if (ReadOffsetValue (type, out width))
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parsed |= MetaParsed.Width;
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break;
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case TIFF.ImageHeight:
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if (1 == count)
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if (ReadOffsetValue (type, out height))
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parsed |= MetaParsed.Height;
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break;
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case TIFF.XPosition:
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if (1 == count)
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if (ReadOffsetValue (type, out pos_x))
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parsed |= MetaParsed.PosX;
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break;
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case TIFF.YPosition:
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if (1 == count)
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if (ReadOffsetValue (type, out pos_y))
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parsed |= MetaParsed.PosY;
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break;
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case TIFF.BitsPerSample:
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if (count * GetTypeSize (type) > 4)
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{
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var bpp_offset = ReadUInt32();
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m_file.BaseStream.Position = bpp_offset;
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}
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bpp = 0;
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for (uint b = 0; b < count; ++b)
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{
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int plane = 0;
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ReadValue (type, out plane);
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bpp += plane;
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}
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parsed |= MetaParsed.BPP;
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break;
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default:
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break;
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}
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}
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ifd += 12;
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m_file.BaseStream.Position = ifd;
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}
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uint ifd_next = ReadUInt32();
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if (ifd_next == ifd)
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break;
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ifd = ifd_next;
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}
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if (MetaParsed.Sufficient == (parsed & MetaParsed.Sufficient))
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return new ImageMetaData() {
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Width = (uint)width,
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Height = (uint)height,
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OffsetX = pos_x,
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OffsetY = pos_y,
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BPP = bpp,
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};
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else
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return null;
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}
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uint GetTypeSize (TagType type)
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{
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if ((int)type < m_type_size.Length)
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return m_type_size[(int)type];
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else
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return 0;
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}
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bool ReadOffsetValue (TagType type, out int value)
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{
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if (GetTypeSize (type) > 4)
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m_file.BaseStream.Position = ReadUInt32();
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return ReadValue (type, out value);
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}
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bool ReadValue (TagType type, out int value)
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{
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switch (type)
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{
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case TagType.Undefined:
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case TagType.SByte:
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case TagType.Byte:
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value = m_file.ReadByte();
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break;
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default:
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case TagType.Ascii:
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value = 0;
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return false;
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case TagType.SShort:
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case TagType.Short:
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value = ReadUInt16();
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break;
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case TagType.SLong:
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case TagType.Long:
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value = (int)ReadUInt32();
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break;
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case TagType.Rational:
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return ReadRational (out value);
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case TagType.SRational:
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return ReadSRational (out value);
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case TagType.Float:
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return ReadFloat (out value);
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case TagType.Double:
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return ReadDouble (out value);
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}
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return true;
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}
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bool ReadRational (out int value)
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{
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uint numer = ReadUInt32();
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uint denom = ReadUInt32();
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if (1 == denom)
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value = (int)numer;
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else if (0 == denom)
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{
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value = 0;
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return false;
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}
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else
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value = (int)((double)numer / denom);
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return true;
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}
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bool ReadSRational (out int value)
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{
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int numer = (int)ReadUInt32();
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int denom = (int)ReadUInt32();
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if (1 == denom)
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value = numer;
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else if (0 == denom)
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{
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value = 0;
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return false;
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}
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else
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value = (int)((double)numer / denom);
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return true;
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}
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bool ReadFloat (out int value)
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{
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var convert_buffer = new byte[4];
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if (4 != m_file.Read (convert_buffer, 0, 4))
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{
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value = 0;
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return false;
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}
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if (m_is_bigendian)
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Array.Reverse (convert_buffer);
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value = (int)BitConverter.ToSingle (convert_buffer, 0);
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return true;
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}
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bool ReadDouble (out int value)
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{
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var convert_buffer = new byte[8];
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if (8 != m_file.Read (convert_buffer, 0, 8))
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{
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value = 0;
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return false;
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}
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if (m_is_bigendian)
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Array.Reverse (convert_buffer);
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long bits = BitConverter.ToInt64 (convert_buffer, 0);
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value = (int)BitConverter.Int64BitsToDouble (bits);
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return true;
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}
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#region IDisposable Members
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bool disposed = false;
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public void Dispose ()
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{
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Dispose (true);
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GC.SuppressFinalize (this);
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}
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protected virtual void Dispose (bool disposing)
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{
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if (!disposed)
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{
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if (disposing)
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{
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m_file.Dispose();
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}
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m_file = null;
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disposed = true;
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}
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}
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#endregion
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}
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}
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}
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