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implemented SGF images.

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morkt 2018-06-14 23:18:26 +04:00
parent 6c6f5d927d
commit 3a6aa0dede
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ArcFormats/Eternity/ImageSGF.cs Normal file
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//! \file ImageSGF.cs
//! \date 2018 Jun 11
//! \brief Eternity engine 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.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using GameRes.Utility;
namespace GameRes.Formats.Eternity
{
internal class SgfMetaData : ImageMetaData
{
public bool HasAlpha;
public int BlockSize;
public uint DataOffset;
}
[Export(typeof(ImageFormat))]
public class SgfFormat : ImageFormat
{
public override string Tag { get { return "SGF"; } }
public override string Description { get { return "Eternity engine image format"; } }
public override uint Signature { get { return 0x644753; } } // 'SG'
public SgfFormat ()
{
Signatures = new uint[] { 0x644753, 0 };
}
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x20);
if (!header.AsciiEqual ("SG"))
return null;
int version = header.ToUInt16 (2);
if (version != 100)
return null;
return new SgfMetaData {
Width = header.ToUInt16 (4),
Height = header.ToUInt16 (6),
BPP = 24,
HasAlpha = header.ToInt32 (8) != 0,
BlockSize = header.ToUInt16 (0xC),
DataOffset = header.ToUInt32 (0x14),
};
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var reader = new SgfReader (file, (SgfMetaData)info);
var pixels = reader.Unpack();
return ImageData.Create (info, reader.Format, null, pixels);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("SgfFormat.Write not implemented");
}
}
internal class SgfReader
{
IBinaryStream m_input;
SgfMetaData m_info;
byte[] m_output;
public byte[] Data { get { return m_output; } }
public PixelFormat Format { get { return PixelFormats.Bgr24; } }
public SgfReader (IBinaryStream input, SgfMetaData info)
{
m_input = input;
m_info = info;
m_output = new byte[3 * info.Width * info.Height];
}
public byte[] Unpack ()
{
long next_pos = m_info.DataOffset;
int height = (int)m_info.Height;
int dst = 0;
byte b = 0, g = 0, r = 0;
for (int y = 0; y < height; ++y)
{
int start_pos = dst;
if (0 == (y % m_info.BlockSize))
{
m_input.Position = next_pos;
next_pos += m_input.ReadUInt32();
b = m_input.ReadUInt8();
g = m_input.ReadUInt8();
r = m_input.ReadUInt8();
m_input.ReadUInt8();
mask1 = mask2 = mask3 = mask4 = mask5 = 1;
}
for (uint x = 0; x < m_info.Width; ++x)
{
b = GetNextByte (b);
g = GetNextByte (g);
r = GetNextByte (r);
m_output[dst++] = b;
m_output[dst++] = g;
m_output[dst++] = r;
}
b = m_output[start_pos];
g = m_output[start_pos+1];
r = m_output[start_pos+2];
}
return m_output;
}
uint mask1;
uint mask2;
uint mask3;
uint mask4;
uint mask5;
uint in1;
uint in2;
uint in3;
uint in4;
uint in5;
byte GetNextByte (byte prev)
{
if (mask1 == 1)
in1 = m_input.ReadUInt32();
if ((mask1 & in1) == 0)
{
if (mask2 == 1)
in2 = m_input.ReadUInt32();
if ((mask2 & in2) != 0)
{
if (mask3 == 1)
in3 = m_input.ReadUInt32();
if (mask4 == 1)
in4 = m_input.ReadUInt32();
uint diff = (in4 & 0xF) + 1;
if ((mask3 & in3) != 0)
prev -= (byte)diff;
else
prev += (byte)diff;
in4 >>= 4;
mask3 = Binary.RotL (mask3, 1);
mask4 = Binary.RotL (mask4, 4);
}
else
{
if (mask5 == 1)
in5 = m_input.ReadUInt32();
prev = (byte)in5;
in5 >>= 8;
mask5 = Binary.RotL (mask5, 8);
}
mask2 = Binary.RotL (mask2, 1);
}
mask1 = Binary.RotL (mask1, 1);
return prev;
}
}
}