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ImageLIM.cs
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//! \file ImageLIM.cs
//! \date Fri Apr 15 12:16:20 2016
//! \brief Liar-soft LIM image format implementation.
//
// Copyright (C) 2015-2016 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.Liar
{
internal class LimMetaData : ImageMetaData
{
public int Flags;
}
[Export(typeof(ImageFormat))]
public class LimFormat : ImageFormat
{
public override string Tag { get { return "LIM"; } }
public override string Description { get { return "Liar-soft image format"; } }
public override uint Signature { get { return 0; } }
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
if (0x4C != file.ReadByte() || 0x4D != file.ReadByte())
return null;
int flag = file.ReadUInt16();
if ((flag & 0xF) != 2 && (flag & 0xF) != 3)
return null;
int bpp = 0x10 == file.ReadUInt16() ? 16 : 32;
var meta = new LimMetaData { BPP = bpp, Flags = flag };
file.ReadUInt16();
meta.Width = file.ReadUInt32();
meta.Height = file.ReadUInt32();
return meta;
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
using (var reader = new Reader (file, (LimMetaData)info))
{
reader.Unpack();
return ImageData.Create (info, reader.Format, null, reader.Data);
}
}
public override void Write (Stream file, ImageData image)
{
throw new NotImplementedException ("LimFormat.Write not implemented");
}
internal class Reader : IDisposable
{
IBinaryStream m_input;
byte[] m_output;
byte[] m_index;
byte[] m_image;
int m_width;
int m_height;
int m_bpp;
int m_flags;
public byte[] Data { get { return m_image; } }
public PixelFormat Format { get; private set; }
public Reader (IBinaryStream file, LimMetaData info)
{
m_input = file;
m_width = (int)info.Width;
m_height = (int)info.Height;
m_bpp = info.BPP;
m_flags = info.Flags;
if (32 == m_bpp)
Format = PixelFormats.Bgra32;
else if (16 == m_bpp)
Format = PixelFormats.Bgr565;
else
throw new InvalidFormatException();
m_image = new byte[m_width*m_height*m_bpp/8];
}
int m_remaining;
int m_current;
int m_bits;
public void Unpack ()
{
m_input.Position = 0x10;
if (32 == m_bpp)
{
Unpack32bpp();
}
else
{
if (0 != (m_flags & 0x10))
{
if (0 != (m_flags & 0xE0))
Unpack16bpp();
else
m_input.Read (m_image, 0, m_image.Length);
}
if (0 != (m_flags & 0x100))
{
if (0 != (m_flags & 0xE00))
{
m_output = null;
UnpackChannel (3);
}
else
m_output = m_input.ReadBytes (m_width * m_height);
ApplyAlpha (m_output);
}
}
}
void Unpack32bpp ()
{
byte mask = 0xFF;
for (int i = 3; i >= 0; --i)
{
UnpackChannel (3);
int src = 0;
for (int p = i; p < m_image.Length; p += 4)
{
m_image[p] = (byte)(m_output[src++] ^ mask);
}
mask = 0;
}
}
void Unpack16bpp ()
{
int image_size = m_input.ReadInt32();
m_output = m_image;
m_remaining = m_input.ReadInt32();
int index_size = m_input.ReadUInt16() * 2;
if (null == m_index || index_size > m_index.Length)
m_index = new byte[index_size];
m_input.ReadInt16(); // ignored
if (index_size != m_input.Read (m_index, 0, index_size))
throw new InvalidFormatException ("Unexpected end of file");
int card;
if (index_size > 8192)
{
m_index_threshold = 14;
m_index_length_limit = 16;
card = 4;
}
else
{
m_index_threshold = 6;
m_index_length_limit = 12;
card = 3;
}
m_current = 0;
int dst = 0;
while (dst < m_output.Length)
{
int bits = GetBits (card);
if (-1 == bits)
break;
if (0 != bits)
{
int index = GetIndex (bits);
if (index < 0)
break;
if (dst + 1 >= m_output.Length)
break;
m_output[dst++] = m_index[index*2];
m_output[dst++] = m_index[index*2+1];
}
else
{
int count = GetBits (4);
if (-1 == count)
break;
bits = GetBits (card);
if (-1 == bits)
break;
int index = GetIndex (bits);
if (-1 == index)
break;
count += 2;
index *= 2;
for (int i = 0; i < count; i++)
{
if (dst + 1 >= m_output.Length)
return;
m_output[dst++] = m_index[index];
m_output[dst++] = m_index[index+1];
}
}
}
}
void ApplyAlpha (byte[] alpha)
{
var pixels = new byte[m_width*m_height*4];
int alpha_src = 0;
int dst = 0;
for (int i = 0; i < m_image.Length; i += 2)
{
int color = LittleEndian.ToUInt16 (m_image, i);
pixels[dst++] = (byte)((color & 0x001F) * 0xFF / 0x1F);
pixels[dst++] = (byte)((color & 0x07E0) * 0xFF / 0x7E0);
pixels[dst++] = (byte)((color & 0xF800) * 0xFF / 0xF800);
pixels[dst++] = (byte)~alpha[alpha_src++];
}
m_image = pixels;
Format = PixelFormats.Bgra32;
}
void UnpackChannel (int card)
{
m_index_threshold = 6;
m_index_length_limit = 12;
int channel_size = m_input.ReadInt32();
if (null == m_output || m_output.Length < channel_size)
m_output = new byte[channel_size];
m_remaining = m_input.ReadInt32();
int index_size = m_input.ReadUInt16();
if (null == m_index || index_size > m_index.Length)
m_index = new byte[index_size];
m_input.ReadInt16(); // ignored
if (index_size != m_input.Read (m_index, 0, index_size))
throw new InvalidFormatException ("Unexpected end of file");
m_current = 0;
int dst = 0;
while (dst < m_output.Length)
{
int bits = GetBits (card);
if (-1 == bits)
break;
if (0 != bits)
{
int index = GetIndex (bits);
if (index < 0)
break;
if (dst + 1 >= m_output.Length)
break;
m_output[dst++] = m_index[index];
}
else
{
int count = GetBits (4);
if (-1 == count)
break;
bits = GetBits (card);
if (-1 == bits)
break;
int index = GetIndex (bits);
if (-1 == index)
break;
count += 2;
for (int i = 0; i < count; i++)
{
if (dst >= m_output.Length)
return;
m_output[dst++] = m_index[index];
}
}
}
}
private int GetBits (int n)
{
int v = 0;
while (n > 0)
{
if (0 == m_current)
{
if (0 == m_remaining)
return 0;
m_bits = m_input.ReadByte();
--m_remaining;
m_current = 8;
}
v <<= 1;
m_bits <<= 1;
v |= (m_bits >> 8) & 1;
--m_current;
--n;
}
return v;
}
int m_index_threshold;
int m_index_length_limit;
private int GetIndex (int bits)
{
if (bits <= m_index_threshold)
{
if (0 == bits)
return -1;
if (1 == bits--)
return GetBits (1);
return (1 << bits) | GetBits (bits);
}
for (int i = m_index_threshold; i < m_index_length_limit; ++i)
{
bits = GetBits (1);
if (-1 == bits)
return -1;
if (0 == bits)
return (1 << i) | GetBits (i);
}
return -1;
}
#region IDisposable Members
public void Dispose ()
{
}
#endregion
}
}
}