GARbro-mirror/Legacy/Akatombo/ImageFB.cs
2018-12-19 03:35:32 +04:00

144 lines
4.7 KiB
C#

//! \file ImageFB.cs
//! \date 2018 Jan 25
//! \brief Akatombo compressed image format.
//
// Copyright (C) 2018 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.Akatombo
{
[Export(typeof(ImageFormat))]
public class FbFormat : ImageFormat
{
public override string Tag { get { return "FB"; } }
public override string Description { get { return "Akatombo image format"; } }
public override uint Signature { get { return 0x184246; } }
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (8);
if (!header.AsciiEqual ("FB"))
return null;
return new ImageMetaData {
Width = header.ToUInt16 (4),
Height = header.ToUInt16 (6),
BPP = header[2],
};
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var reader = new FbReader (file, info);
var pixels = reader.Unpack();
return ImageData.CreateFlipped (info, reader.Format, null, pixels, reader.Stride);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("FbFormat.Write not implemented");
}
}
internal class FbReader
{
IBinaryStream m_input;
int m_width;
byte[] m_output;
public PixelFormat Format { get; private set; }
public int Stride { get; private set; }
public FbReader (IBinaryStream input, ImageMetaData info)
{
m_input = input;
m_width = info.iWidth;
Stride = 4 * m_width;
m_output = new byte[Stride * info.iHeight];
Format = PixelFormats.Bgr32;
}
uint m_bits;
public byte[] Unpack ()
{
m_input.Position = 8;
m_bits = 0x80000000;
for (int dst = 0; dst < m_output.Length; dst += 4)
{
int bit = GetNextBit();
if (0 == bit)
{
bit = GetNextBit();
int pos = GetNextBit();
if (bit != 0)
pos = dst + 4 * (pos - m_width);
else
pos = dst + 4 * (-m_width & -pos) - 4;
if (pos >= 0)
Buffer.BlockCopy (m_output, pos, m_output, dst, 4);
}
m_output[dst ] += ReadDiff();
m_output[dst+1] += ReadDiff();
m_output[dst+2] += ReadDiff();
}
return m_output;
}
byte ReadDiff ()
{
int count = 1;
while (GetNextBit() != 0)
{
++count;
}
int n = 1;
while (count --> 0)
{
n = (n << 1) | GetNextBit();
}
return (byte)(-(n & 1) ^ ((n >> 1) - 1));
}
byte[] m_bits_buffer = new byte[4];
int GetNextBit ()
{
uint bit = m_bits >> 31;
m_bits <<= 1;
if (0 == m_bits)
{
if (0 == m_input.Read (m_bits_buffer, 0, 4))
throw new EndOfStreamException();
m_bits = BigEndian.ToUInt32 (m_bits_buffer, 0);
bit = m_bits >> 31;
m_bits = (m_bits << 1) | 1;
}
return (int)bit;
}
}
}