GARbro-mirror/ArcFormats/ShiinaRio/ImageMI4.cs

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//! \file ImageMI4.cs
//! \date Sun Jul 12 15:40:39 2015
//! \brief ShiinaRio engine 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.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
namespace GameRes.Formats.ShiinaRio
{
[Export(typeof(ImageFormat))]
public class Mi4Format : ImageFormat
{
public override string Tag { get { return "MI4"; } }
public override string Description { get { return "ShiinaRio image format"; } }
public override uint Signature { get { return 0x3449414D; } } // 'MAI4'
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public override ImageMetaData ReadMetaData (IBinaryStream file)
{
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file.Position = 8;
uint width = file.ReadUInt32();
uint height = file.ReadUInt32();
return new ImageMetaData
{
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Width = width,
Height = height,
BPP = 24,
};
}
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public override ImageData Read (IBinaryStream stream, ImageMetaData info)
{
var reader = new Reader (stream, (int)info.Width, (int)info.Height);
try
{
reader.Unpack (MaiVersion.First);
}
catch
{
reader.Unpack (MaiVersion.Second);
}
return ImageData.Create (info, PixelFormats.Bgr24, null, reader.Data, reader.Stride);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("Mi4Format.Write not implemented");
}
internal enum MaiVersion
{
First, Second
}
internal sealed class Reader
{
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IBinaryStream m_input;
byte[] m_output;
int m_stride;
public byte[] Data { get { return m_output; } }
public int Stride { get { return m_stride; } }
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public Reader (IBinaryStream file, int width, int height)
{
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m_input = file;
m_stride = width * 3;
m_output = new byte[m_stride*height];
}
public void Unpack (MaiVersion version = MaiVersion.First)
{
m_input.Position = 0x10;
m_bit_count = 0;
LoadBits();
if (MaiVersion.First == version)
UnpackV1();
else
UnpackV2();
}
int m_bit_count;
uint m_bits;
void LoadBits ()
{
for (int i = 0; i < 4; ++i)
{
int b = m_input.ReadByte();
if (-1 == b)
break;
m_bits = (m_bits >> 8) | (uint)(b << 24);
m_bit_count += 8;
}
}
uint GetBit ()
{
uint bit = m_bits >> 31;
m_bits <<= 1;
if (0 == --m_bit_count)
{
LoadBits();
}
return bit;
}
uint GetBits (int count)
{
int avail_bits = Math.Min (count, m_bit_count);
uint bits = m_bits >> (32 - avail_bits);
m_bits <<= avail_bits;
m_bit_count -= avail_bits;
count -= avail_bits;
if (0 == m_bit_count)
{
LoadBits();
if (count > 0)
{
bits = bits << count | m_bits >> (32 - count);
m_bits <<= count;
m_bit_count -= count;
}
}
return bits;
}
void UnpackV1 ()
{
int dst = 0;
byte b = 0, g = 0, r = 0;
while (dst < m_output.Length)
{
if (GetBit() == 0)
{
if (GetBit() != 0)
{
b = m_input.ReadUInt8();
g = m_input.ReadUInt8();
r = m_input.ReadUInt8();
}
else if (GetBit() != 0)
{
byte v = (byte)GetBits (2);
if (3 == v)
{
b = m_output[dst - m_stride];
g = m_output[dst - m_stride + 1];
r = m_output[dst - m_stride + 2];
}
else
{
b += (byte)(v - 1);
g += (byte)(GetBits(2) - 1);
r += (byte)(GetBits(2) - 1);
}
}
else if (GetBit() != 0)
{
byte v = (byte)(GetBits(3));
if (7 == v)
{
b = m_output[dst - m_stride + 3];
g = m_output[dst - m_stride + 4];
r = m_output[dst - m_stride + 5];
}
else
{
b += (byte)(v - 3);
g += (byte)(GetBits(3) - 3);
r += (byte)(GetBits(3) - 3);
}
}
else if (GetBit() != 0)
{
byte v = (byte)GetBits (4);
if (0xF == v)
{
b = m_output[dst - m_stride - 3];
g = m_output[dst - m_stride - 2];
r = m_output[dst - m_stride - 1];
}
else
{
b += (byte)(v - 7);
g += (byte)(GetBits(4) - 7);
r += (byte)(GetBits(4) - 7);
}
}
else
{
b += (byte)(GetBits(5) - 15);
g += (byte)(GetBits(5) - 15);
r += (byte)(GetBits(5) - 15);
}
}
m_output[dst++] = b;
m_output[dst++] = g;
m_output[dst++] = r;
}
}
void UnpackV2 ()
{
int dst = 0;
byte b = 0, g = 0, r = 0;
while (dst < m_output.Length)
{
if (GetBit() == 0)
{
if (GetBit() != 0)
{
if (m_input.PeekByte() != -1)
{
b = m_input.ReadUInt8();
g = m_input.ReadUInt8();
r = m_input.ReadUInt8();
}
}
else if (GetBit() != 0)
{
byte v = (byte)(GetBits(2));
if (3 == v)
{
b = m_output[dst - m_stride];
g = m_output[dst - m_stride + 1];
r = m_output[dst - m_stride + 2];
}
else
{
b += (byte)(v - 1);
v = (byte)GetBits (2);
if (3 == v)
{
if (GetBit() != 0)
{
b = m_output[dst - m_stride - 3];
g = m_output[dst - m_stride - 2];
r = m_output[dst - m_stride - 1];
}
else
{
b = m_output[dst - m_stride + 3];
g = m_output[dst - m_stride + 4];
r = m_output[dst - m_stride + 5];
}
}
else
{
g += (byte)(v - 1);
r += (byte)(GetBits(2) - 1);
}
}
}
else if (GetBit() != 0)
{
byte v = (byte)(GetBits(3));
if (7 == v)
{
b = m_output[dst - m_stride];
g = m_output[dst - m_stride + 1];
r = m_output[dst - m_stride + 2];
b += (byte)(GetBits(3) - 3);
g += (byte)(GetBits(3) - 3);
r += (byte)(GetBits(3) - 3);
}
else
{
b += (byte)(v - 3);
g += (byte)(GetBits(3) - 3);
r += (byte)(GetBits(3) - 3);
}
}
else if (GetBit() != 0)
{
b += (byte)(GetBits(4) - 7);
g += (byte)(GetBits(4) - 7);
r += (byte)(GetBits(4) - 7);
}
else
{
b += (byte)(GetBits(5) - 15);
g += (byte)(GetBits(5) - 15);
r += (byte)(GetBits(5) - 15);
}
}
m_output[dst++] = b;
m_output[dst++] = g;
m_output[dst++] = r;
}
}
}
}
}