GARbro-mirror/ArcFormats/ImageMCG.cs
2015-07-14 18:44:27 +04:00

199 lines
7.1 KiB
C#

//! \file ImageMCG.cs
//! \date Mon Jul 13 17:58:33 2015
//! \brief F&C Co. image format.
//
// Copyright (C) 2015 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;
using GameRes.Formats.Properties;
using GameRes.Utility;
namespace GameRes.Formats.FC01
{
internal class McgMetaData : ImageMetaData
{
public int DataOffset;
public int PackedSize;
}
[Export(typeof(ImageFormat))]
public class McgFormat : ImageFormat
{
public override string Tag { get { return "MCG"; } }
public override string Description { get { return "F&C Co. image format"; } }
public override uint Signature { get { return 0x2047434D; } } // 'MCG'
public override ImageMetaData ReadMetaData (Stream stream)
{
byte[] header = new byte[0x40];
if (header.Length != stream.Read (header, 0, header.Length))
return null;
if (!Binary.AsciiEqual (header, 4, "2.00"))
throw new NotSupportedException ("Not supported MCG format version");
int header_size = LittleEndian.ToInt32 (header, 0x10);
if (header_size < 0x40)
return null;
int bpp = LittleEndian.ToInt32 (header, 0x24);
if (24 != bpp)
throw new NotSupportedException ("Not supported MCG image bitdepth");
return new McgMetaData
{
Width = LittleEndian.ToUInt32 (header, 0x1c),
Height = LittleEndian.ToUInt32 (header, 0x20),
OffsetX = LittleEndian.ToInt32 (header, 0x14),
OffsetY = LittleEndian.ToInt32 (header, 0x18),
BPP = bpp,
DataOffset = header_size,
PackedSize = LittleEndian.ToInt32 (header, 0x38) - header_size,
};
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
var meta = info as McgMetaData;
if (null == meta)
throw new ArgumentException ("McgFormat.Read should be supplied with McgMetaData", "info");
var reader = new McgDecoder (stream, meta);
reader.Unpack();
return ImageData.Create (info, PixelFormats.Bgr24, null, reader.Data);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("McgFormat.Write not implemented");
}
public static readonly IReadOnlyDictionary<string, byte> KnownKeys = new Dictionary<string, byte>()
{
{ "Konata yori Kanata made", 0xD5 },
};
}
// mcg decompression // graphic.unt @ 100047B0
internal class McgDecoder
{
byte[] m_input;
byte[] m_output;
uint m_width;
uint m_height;
uint m_pixels;
byte m_key;
public byte[] Data { get { return m_output; } }
public McgDecoder (Stream input, McgMetaData info)
{
input.Position = info.DataOffset;
m_input = new byte[info.PackedSize];
if (m_input.Length != input.Read (m_input, 0, m_input.Length))
throw new InvalidFormatException ("Unexpected end of file");
m_width = info.Width;
m_height = info.Height;
m_pixels = m_width*m_height;
m_output = new byte[m_pixels*3];
m_key = Settings.Default.MCGLastKey;
}
static readonly byte[] ChannelOrder = { 1, 0, 2 };
public void Unpack ()
{
var reader = new MrgDecoder (m_input, 0, m_pixels);
do
{
reader.ResetKey (m_key);
try
{
for (int i = 0; i < 3; ++i)
{
reader.Unpack();
var plane = reader.Data;
int src = 0;
for (int j = ChannelOrder[i]; j < m_output.Length; j += 3)
{
m_output[j] = plane[src++];
}
}
// Trace.WriteLine (string.Format ("Found matching key {0:X2}", key), "[MCG]");
}
catch (InvalidFormatException)
{
m_key++;
continue;
}
Transform();
Settings.Default.MCGLastKey = m_key;
return;
}
while (m_key != Settings.Default.MCGLastKey);
throw new UnknownEncryptionScheme();
}
void Transform ()
{
uint dst = 0;
uint stride = (m_width - 1) * 3;
for (uint y = m_height-1; y > 0; --y) // @@1a
{
for (uint x = stride; x > 0; --x) // @@1b
{
int p0 = m_output[dst];
int py = m_output[dst+stride+3] - p0;
int px = m_output[dst+3] - p0;
p0 = Math.Abs (px + py);
py = Math.Abs (py);
px = Math.Abs (px);
byte pv;
if (p0 >= px && py >= px)
pv = m_output[dst+stride+3];
else if (p0 < py)
pv = m_output[dst];
else
pv = m_output[dst+3];
m_output[dst+stride+6] += (byte)(pv + 0x80);
++dst;
}
dst += 3;
}
dst = 0;
for (uint i = 0; i < m_pixels; ++i)
{
sbyte b = -128;
sbyte r = -128;
b += (sbyte)m_output[dst];
r += (sbyte)m_output[dst+2];
int g = m_output[dst+1] - ((b + r) >> 2);
m_output[dst++] = (byte)(b + g);
m_output[dst++] = (byte)g;
m_output[dst++] = (byte)(r + g);
}
}
}
}