GARbro-mirror/Legacy/Melody/ImageMGO.cs

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2017-12-31 13:04:35 +08:00
//! \file ImageMGO.cs
//! \date 2017 Dec 31
//! \brief Melody compressed image.
//
// Copyright (C) 2017 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.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media.Imaging;
using GameRes.Compression;
namespace GameRes.Formats.Melody
{
internal class MgoMetaData : ImageMetaData
{
public int UnpackedSize;
public int BmpOffset;
}
[Export(typeof(ImageFormat))]
public class MgoFormat : ImageFormat
{
public override string Tag { get { return "MGO"; } }
public override string Description { get { return "Melody compressed bitmap"; } }
public override uint Signature { get { return 0x424F474D; } } // 'MGOB'
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (12);
if (header.ToInt32 (4) != 5)
return null;
using (var lzss = new PackedStream<LzssDecompressor> (file.AsStream, true))
using (var stream = new SeekableStream (lzss))
using (var mgo = new BinaryStream (stream, file.Name))
{
var name = mgo.ReadCString();
mgo.Position = ((int)(mgo.Position - 1) & ~3) + 4;
int count = mgo.ReadInt32();
mgo.Seek (count * 0x10, SeekOrigin.Current);
int bmp_position = (int)mgo.Position;
var bmp_header = mgo.ReadBytes (0x36);
if (!bmp_header.AsciiEqual ("BM"))
return null;
return new MgoMetaData {
Width = bmp_header.ToUInt32 (0x12),
Height = bmp_header.ToUInt32 (0x16),
BPP = bmp_header.ToInt32 (0x1C),
UnpackedSize = header.ToInt32 (8),
BmpOffset = bmp_position,
};
}
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var meta = (MgoMetaData)info;
file.Position = 12;
using (var lzss = new PackedStream<LzssDecompressor> (file.AsStream, true))
{
var header = new byte[meta.BmpOffset];
lzss.Read (header, 0, header.Length);
var decoder = new BmpBitmapDecoder (lzss,
BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
var frame = decoder.Frames[0];
frame.Freeze();
return new ImageData (frame, info);
}
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("MgoFormat.Write not implemented");
}
}
internal class LzssDecompressor : Decompressor
{
LsbBitStream m_input;
public override void Initialize (Stream input)
{
m_input = new LsbBitStream (input, true);
}
protected override IEnumerator<int> Unpack ()
{
byte[] frame = new byte[0x1000];
int frame_pos = 1;
for (;;)
{
int ctl = m_input.GetNextBit();
if (-1 == ctl)
yield break;
if (ctl != 0)
{
byte v = (byte)m_input.GetBits (8);
m_buffer[m_pos++] = frame[frame_pos++ & 0xFFF] = v;
if (0 == --m_length)
yield return m_pos;
}
else
{
int offset = m_input.GetBits (12);
if (-1 == offset)
yield break;
int count = m_input.GetBits (4) + 2;
while (count --> 0)
{
byte v = frame[offset++ & 0xFFF];
m_buffer[m_pos++] = frame[frame_pos++ & 0xFFF] = v;
if (0 == --m_length)
yield return m_pos;
}
}
}
}
#region IDisposable Members
bool m_disposed = false;
protected override void Dispose (bool disposing)
{
if (!m_disposed)
{
base.Dispose (disposing);
if (disposing && m_input != null)
m_input.Dispose();
m_disposed = true;
}
}
#endregion
}
}