GARbro-mirror/ArcFormats/Nexas/ImageGRP.cs

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2016-05-21 01:53:09 +08:00
//! \file ImageGRP.cs
//! \date Fri May 20 20:30:01 2016
//! \brief NeXAS GRP image format.
//
// Copyright (C) 2016 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using GameRes.Utility;
namespace GameRes.Formats.NeXAS
{
internal class GrpMetaData : ImageMetaData
{
public int UnpackedSize;
}
[Export(typeof(ImageFormat))]
public class GrpFormat : ImageFormat
{
public override string Tag { get { return "GR3"; } }
public override string Description { get { return "NeXAS engine image format"; } }
public override uint Signature { get { return 0x18335247; } }
public GrpFormat ()
{
Extensions = new string[] { "grp" };
}
public override ImageMetaData ReadMetaData (Stream stream)
{
var header = new byte[0x11];
if (header.Length != stream.Read (header, 0, header.Length))
return null;
return new GrpMetaData
{
Width = LittleEndian.ToUInt32 (header, 5),
Height = LittleEndian.ToUInt32 (header, 9),
BPP = LittleEndian.ToUInt16 (header, 3),
UnpackedSize = LittleEndian.ToInt32 (header, 0xD),
};
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
using (var reader = new GrpReader (stream, (GrpMetaData)info))
{
reader.Unpack();
return ImageData.Create (info, reader.Format, null, reader.Data);
}
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("GrpFormat.Write not implemented");
}
}
internal sealed class GrpReader : IDisposable
{
BinaryReader m_input;
byte[] m_output;
public byte[] Data { get { return m_output; } }
public PixelFormat Format { get; private set; }
public GrpReader (Stream input, GrpMetaData info)
{
m_input = new ArcView.Reader (input);
m_output = new byte[info.UnpackedSize];
if (24 == info.BPP)
Format = PixelFormats.Bgr24;
else if (32 == info.BPP)
Format = PixelFormats.Bgr32;
else
throw new NotSupportedException ("Not supported GRP image color depth");
}
public void Unpack ()
{
m_input.BaseStream.Position = 0x11;
int ctl_length = (m_input.ReadInt32() + 7) / 8;
var ctl_bytes = m_input.ReadBytes (ctl_length);
m_input.ReadInt32();
using (var ctl_mem = new MemoryStream (ctl_bytes))
using (var bits = new LsbBitStream (ctl_mem))
{
int dst = 0;
while (dst < m_output.Length)
{
int bit = bits.GetNextBit();
if (-1 == bit)
break;
if (0 == bit)
{
m_output[dst++] = m_input.ReadByte();
}
else
{
int offset = m_input.ReadUInt16();
int count = (offset & 7) + 1;
offset = (offset >> 3) + 1;
Binary.CopyOverlapped (m_output, dst - offset, dst, count);
dst += count;
}
}
}
}
#region IDisposable Members
bool _disposed = false;
public void Dispose ()
{
if (!_disposed)
{
m_input.Dispose();
_disposed = true;
}
}
#endregion
}
}