GARbro-mirror/ArcFormats/Eternity/ImageSGF.cs

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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;
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public uint AlphaOffset;
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}
[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),
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AlphaOffset = header.ToUInt32 (0x1C),
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};
}
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; } }
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public PixelFormat Format { get; private set; }
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public SgfReader (IBinaryStream input, SgfMetaData info)
{
m_input = input;
m_info = info;
m_output = new byte[3 * info.Width * info.Height];
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Format = PixelFormats.Bgr24;
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}
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];
}
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if (m_info.HasAlpha)
{
var alpha = ReadAlpha();
if (alpha != null)
{
var pixels = new byte[m_info.iWidth * m_info.iHeight * 4];
dst = 0;
int p = 0;
int a = 0;
while (dst < pixels.Length)
{
pixels[dst++] = m_output[p++];
pixels[dst++] = m_output[p++];
pixels[dst++] = m_output[p++];
pixels[dst++] = alpha[a++];
}
m_output = pixels;
Format = PixelFormats.Bgra32;
}
}
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return m_output;
}
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byte[] ReadAlpha ()
{
m_input.Position = m_info.AlphaOffset;
var signature = m_input.ReadUInt16();
if (0x2041 == signature) // 'A '
return ReadASection();
else if (0x4D42 == signature) // 'BM'
return ReadBmpSection();
else
return null;
}
byte[] ReadASection ()
{
var alpha = new byte[m_info.iWidth * m_info.iHeight];
m_input.Position = m_info.AlphaOffset + 8;
int block_size = m_input.ReadUInt16();
m_input.Position = m_info.AlphaOffset + 0x10;
uint offset = m_input.ReadUInt32();
uint next_pos = m_info.AlphaOffset + offset;
int height = (int)m_info.Height;
int dst = alpha.Length - m_info.iWidth;
byte a = 0;
for (int y = 0; y < height; ++y)
{
int start_pos = dst;
if (0 == (y % block_size))
{
m_input.Position = next_pos;
next_pos += m_input.ReadUInt32();
a = (byte)m_input.ReadUInt32();
mask1 = mask2 = mask3 = mask4 = mask5 = 1;
}
for (uint x = 0; x < m_info.Width; ++x)
{
a = GetNextByte (a);
alpha[dst++] = a;
}
a = alpha[start_pos];
dst = start_pos - m_info.iWidth;
}
return alpha;
}
byte[] ReadBmpSection ()
{
// throw new NotImplementedException ("ReadBmpSection not implemented.");
return null;
}
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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;
}
}
}