GARbro-mirror/ArcFormats/Otemoto/ImageMAG.cs

203 lines
7.3 KiB
C#

//! \file ImageMAG.cs
//! \date 2017 Dec 28
//! \brief Otemoto image format.
//
// Copyright (C) 2017 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;
using GameRes.Utility;
namespace GameRes.Formats.Otemoto
{
internal class MagMetaData : ImageMetaData
{
public int PaletteOffset;
public int BitsOffset;
public int Data1Offset;
public int Data1Length;
public int Data2Offset;
public int Data2Length;
}
[Export(typeof(ImageFormat))]
public class MagFormat : ImageFormat
{
public override string Tag { get { return "MAG"; } }
public override string Description { get { return "Otemoto image format"; } }
public override uint Signature { get { return 0x494B414D; } } // 'MAKI02'
public override ImageMetaData ReadMetaData (IBinaryStream file)
{
var header = file.ReadHeader (0x40);
if (!header.AsciiEqual ("MAKI02 "))
return null;
int header_pos = 8;
for ( ; header_pos < header.Length; ++header_pos)
{
if (header[header_pos] == 0x1A)
break;
}
if (header_pos++ == header.Length)
return null;
header = file.ReadHeader (header_pos+0x20);
int x = header.ToUInt16 (header_pos+4);
int y = header.ToUInt16 (header_pos+6);
int width = header.ToUInt16 (header_pos+8) - x + 1;
int height = header.ToUInt16 (header_pos+10) - y + 1;
int bpp = (0 != (header[header_pos+3] & 0x80)) ? 8 : 4;
return new MagMetaData {
Width = (uint)width,
Height = (uint)height,
OffsetX = x,
OffsetY = y,
BPP = bpp,
PaletteOffset = header_pos + 0x20,
BitsOffset = header_pos + header.ToInt32 (header_pos + 0xC),
Data1Offset = header_pos + header.ToInt32 (header_pos + 0x10),
Data1Length = header_pos + header.ToInt32 (header_pos + 0x14),
Data2Offset = header_pos + header.ToInt32 (header_pos + 0x18),
Data2Length = header_pos + header.ToInt32 (header_pos + 0x1C),
};
}
public override ImageData Read (IBinaryStream file, ImageMetaData info)
{
var reader = new MakiReader (file, (MagMetaData)info);
var pixels = reader.Unpack();
return ImageData.Create (info, reader.Format, reader.Palette, pixels, reader.Stride);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("MagFormat.Write not implemented");
}
}
internal sealed class MakiReader
{
IBinaryStream m_input;
MagMetaData m_info;
int m_stride;
ushort[] m_output;
public PixelFormat Format { get; private set; }
public BitmapPalette Palette { get; private set; }
public int Stride { get { return m_stride; } }
public Array Data { get { return m_output; } }
public MakiReader (IBinaryStream file, MagMetaData info)
{
m_input = file;
m_info = info;
m_stride = (((int)m_info.Width * m_info.BPP + 31) >> 5) << 2;
if (8 == m_info.BPP)
Format = PixelFormats.Indexed8;
else
Format = PixelFormats.Indexed4;
PrepareOffsetsTable();
}
public Array Unpack ()
{
m_input.Position = m_info.PaletteOffset;
Palette = ReadPalette();
m_input.Position = m_info.BitsOffset;
var ctl_bits = m_input.ReadBytes (m_info.Data1Offset - m_info.BitsOffset);
int bits_src = 0;
m_input.Position = m_info.Data1Offset;
var data1 = m_input.ReadBytes (m_info.Data1Length);
int src1 = 0;
m_input.Position = m_info.Data2Offset;
int height = (int)m_info.Height;
m_output = new ushort[height * m_stride / 2];
int w_blocks = (int)m_info.Width / (32 / m_info.BPP);
var cbuf = new byte[w_blocks];
byte bit_mask = 0;
byte bits = 0;
for (int y = 0; y < height; ++y)
{
int dst = m_stride * y / 2;
for (int x = 0; x < w_blocks; ++x)
{
bit_mask >>= 1;
if (0 == bit_mask)
{
bits = ctl_bits[bits_src++];
bit_mask = 0x80;
}
if (0 != (bit_mask & bits))
cbuf[x] ^= data1[src1++];
RestorePixels (dst++, cbuf[x] >> 4);
RestorePixels (dst++, cbuf[x] & 0xF);
}
}
return m_output;
}
void RestorePixels (int dst, int code)
{
ushort val;
if (code != 0)
val = m_output[dst + m_offsets[code]];
else
val = m_input.ReadUInt16();
m_output[dst] = val;
}
BitmapPalette ReadPalette ()
{
int colors = 1 << m_info.BPP;
var palette_data = m_input.ReadBytes (colors * 3);
var color_map = new Color[colors];
int src = 0;
for (int i = 0; i < colors; ++i)
{
color_map[i] = Color.FromRgb (palette_data[src+1], palette_data[src], palette_data[src+2]);
src += 3;
}
return new BitmapPalette (color_map);
}
int[] m_offsets = new int[16];
static readonly sbyte[] x_offs = { 0, 2, 4, 8, 0, 2, 0, 2, 4, 0, 2, 4, 0, 2, 4, 0 };
static readonly sbyte[] y_offs = { 0, 0, 0, 0, -1, -1, -2, -2, -2, -4, -4, -4, -8, -8, -8, -16 };
void PrepareOffsetsTable ()
{
for (int i = 0; i < 16; ++i)
{
int y = y_offs[i];
int x = x_offs[i];
m_offsets[i] = (m_stride * y - x) >> 1;
}
}
}
}