GARbro-mirror/ArcFormats/NSystem/ImageMGD.cs

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//! \file ImageMGD.cs
//! \date Thu Nov 24 14:37:18 2016
//! \brief NSystem image format.
//
// Copyright (C) 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 System.Windows.Media.Imaging;
namespace GameRes.Formats.NSystem
{
internal class MgdMetaData : ImageMetaData
{
public int DataOffset;
public int UnpackedSize;
public int Mode;
}
[Export(typeof(ImageFormat))]
public class MgdFormat : ImageFormat
{
public override string Tag { get { return "MGD/NSystem"; } }
public override string Description { get { return "NSystem image format"; } }
public override uint Signature { get { return 0x2044474D; } } // 'MGD '
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x1A);
int header_size = header.ToUInt16 (4);
uint width = header.ToUInt16 (0xC);
uint height = header.ToUInt16 (0xE);
int unpacked_size = header.ToInt32 (0x10);
int mode = header.ToInt32 (0x18);
if (mode < 0 || mode > 2)
return null;
return new MgdMetaData
{
Width = width,
Height = height,
BPP = 32,
DataOffset = header_size,
UnpackedSize = unpacked_size,
Mode = mode,
};
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var meta = (MgdMetaData)info;
file.Position = meta.DataOffset;
int data_size = file.ReadInt32();
switch (meta.Mode)
{
case 0:
var pixels = file.ReadBytes (data_size);
return ImageData.Create (info, PixelFormats.Bgra32, null, pixels);
case 1:
{
var decoder = new MgdDecoder (file, meta, data_size);
decoder.Unpack();
return ImageData.Create (info, PixelFormats.Bgra32, null, decoder.Data);
}
case 2:
using (var png = new StreamRegion (file.AsStream, file.Position, data_size, true))
{
var decoder = new PngBitmapDecoder (png,
BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
var frame = decoder.Frames[0];
frame.Freeze();
return new ImageData (frame, info);
}
default:
throw new InvalidFormatException();
}
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("MgdFormat.Write not implemented");
}
}
internal class MgdDecoder
{
IBinaryStream m_input;
MgdMetaData m_info;
byte[] m_output;
public byte[] Data { get { return m_output; } }
public MgdDecoder (IBinaryStream input, MgdMetaData info, int packed_size)
{
m_input = input;
m_info = info;
m_output = new byte[m_info.UnpackedSize];
}
public void Unpack ()
{
int alpha_size = m_input.ReadInt32();
UnpackAlpha (alpha_size);
int rgb_size = m_input.ReadInt32();
UnpackColor (rgb_size);
}
void UnpackAlpha (int length)
{
int dst = 3;
while (length > 0)
{
int count = m_input.ReadInt16();
length -= 2;
if (count < 0)
{
count = (count & 0x7FFF) + 1;
byte a = m_input.ReadUInt8();
length--;
for (int i = 0; i < count; ++i)
{
m_output[dst] = a;
dst += 4;
}
}
else
{
for (int i = 0; i < count; ++i)
{
m_output[dst] = m_input.ReadUInt8();
dst += 4;
}
length -= count;
}
}
}
void UnpackColor (int length)
{
int dst = 0;
while (length > 0)
{
int count = m_input.ReadUInt8();
length--;
switch (count & 0xC0)
{
case 0x80:
count &= 0x3F;
int b = m_output[dst-4];
int g = m_output[dst-3];
int r = m_output[dst-2];
for (int i = 0; i < count; ++i)
{
ushort delta = m_input.ReadUInt16();
length -= 2;
if (0 != (delta & 0x8000))
{
r += (delta >> 10) & 0x1F;
g += (delta >> 5) & 0x1F;
b += delta & 0x1F;
}
else
{
if (0 != (delta & 0x4000))
r -= (delta >> 10) & 0xF;
else
r += (delta >> 10) & 0xF;
if (0 != (delta & 0x0200))
g -= (delta >> 5) & 0xF;
else
g += (delta >> 5) & 0xF;
if (0 != (delta & 0x0010))
b -= delta & 0xF;
else
b += delta & 0xF;
}
m_output[dst ] = (byte)b;
m_output[dst+1] = (byte)g;
m_output[dst+2] = (byte)r;
dst += 4;
}
break;
case 0x40:
count &= 0x3F;
m_input.Read (m_output, dst, 3);
length -= 3;
int src = dst;
dst += 4;
for (int i = 0; i < count; ++i)
{
m_output[dst ] = m_output[src ];
m_output[dst+1] = m_output[src+1];
m_output[dst+2] = m_output[src+2];
dst += 4;
}
break;
case 0:
for (int i = 0; i < count; ++i)
{
m_input.Read (m_output, dst, 3);
length -= 3;
dst += 4;
}
break;
default:
throw new InvalidFormatException();
}
}
}
}
}