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203 lines
7.3 KiB
C#
203 lines
7.3 KiB
C#
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//! \file ImageMAG.cs
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//! \date 2017 Dec 28
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//! \brief Otemoto image format.
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//
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// Copyright (C) 2017 by morkt
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to
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// deal in the Software without restriction, including without limitation the
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// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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// sell copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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// IN THE SOFTWARE.
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//
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using System;
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using System.ComponentModel.Composition;
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using System.IO;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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using GameRes.Utility;
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namespace GameRes.Formats.Otemoto
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{
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internal class MagMetaData : ImageMetaData
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{
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public int PaletteOffset;
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public int BitsOffset;
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public int Data1Offset;
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public int Data1Length;
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public int Data2Offset;
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public int Data2Length;
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}
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[Export(typeof(ImageFormat))]
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public class MagFormat : ImageFormat
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{
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public override string Tag { get { return "MAG"; } }
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public override string Description { get { return "Otemoto image format"; } }
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public override uint Signature { get { return 0x494B414D; } } // 'MAKI02'
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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var header = file.ReadHeader (0x40);
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if (!header.AsciiEqual ("MAKI02 "))
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return null;
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int header_pos = 8;
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for ( ; header_pos < header.Length; ++header_pos)
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{
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if (header[header_pos] == 0x1A)
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break;
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}
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if (header_pos++ == header.Length)
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return null;
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header = file.ReadHeader (header_pos+0x20);
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int x = header.ToUInt16 (header_pos+4);
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int y = header.ToUInt16 (header_pos+6);
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int width = header.ToUInt16 (header_pos+8) - x + 1;
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int height = header.ToUInt16 (header_pos+10) - y + 1;
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int bpp = (0 != (header[header_pos+3] & 0x80)) ? 8 : 4;
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return new MagMetaData {
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Width = (uint)width,
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Height = (uint)height,
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OffsetX = x,
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OffsetY = y,
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BPP = bpp,
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PaletteOffset = header_pos + 0x20,
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BitsOffset = header_pos + header.ToInt32 (header_pos + 0xC),
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Data1Offset = header_pos + header.ToInt32 (header_pos + 0x10),
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Data1Length = header_pos + header.ToInt32 (header_pos + 0x14),
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Data2Offset = header_pos + header.ToInt32 (header_pos + 0x18),
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Data2Length = header_pos + header.ToInt32 (header_pos + 0x1C),
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};
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}
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public override ImageData Read (IBinaryStream file, ImageMetaData info)
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{
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var reader = new MakiReader (file, (MagMetaData)info);
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var pixels = reader.Unpack();
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return ImageData.Create (info, reader.Format, reader.Palette, pixels, reader.Stride);
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}
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public override void Write (Stream file, ImageData image)
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{
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throw new System.NotImplementedException ("MagFormat.Write not implemented");
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}
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}
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internal sealed class MakiReader
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{
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IBinaryStream m_input;
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MagMetaData m_info;
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int m_stride;
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ushort[] m_output;
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public PixelFormat Format { get; private set; }
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public BitmapPalette Palette { get; private set; }
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public int Stride { get { return m_stride; } }
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public Array Data { get { return m_output; } }
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public MakiReader (IBinaryStream file, MagMetaData info)
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{
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m_input = file;
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m_info = info;
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m_stride = (((int)m_info.Width * m_info.BPP + 31) >> 5) << 2;
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if (8 == m_info.BPP)
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Format = PixelFormats.Indexed8;
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else
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Format = PixelFormats.Indexed4;
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PrepareOffsetsTable();
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}
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public Array Unpack ()
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{
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m_input.Position = m_info.PaletteOffset;
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Palette = ReadPalette();
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m_input.Position = m_info.BitsOffset;
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var ctl_bits = m_input.ReadBytes (m_info.Data1Offset - m_info.BitsOffset);
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int bits_src = 0;
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m_input.Position = m_info.Data1Offset;
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var data1 = m_input.ReadBytes (m_info.Data1Length);
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int src1 = 0;
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m_input.Position = m_info.Data2Offset;
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int height = (int)m_info.Height;
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m_output = new ushort[height * m_stride / 2];
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int w_blocks = (int)m_info.Width / (32 / m_info.BPP);
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var cbuf = new byte[w_blocks];
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byte bit_mask = 0;
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byte bits = 0;
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for (int y = 0; y < height; ++y)
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{
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int dst = m_stride * y / 2;
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for (int x = 0; x < w_blocks; ++x)
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{
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bit_mask >>= 1;
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if (0 == bit_mask)
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{
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bits = ctl_bits[bits_src++];
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bit_mask = 0x80;
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}
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if (0 != (bit_mask & bits))
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cbuf[x] ^= data1[src1++];
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RestorePixels (dst++, cbuf[x] >> 4);
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RestorePixels (dst++, cbuf[x] & 0xF);
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}
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}
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return m_output;
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}
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void RestorePixels (int dst, int code)
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{
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ushort val;
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if (code != 0)
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val = m_output[dst + m_offsets[code]];
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else
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val = m_input.ReadUInt16();
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m_output[dst] = val;
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}
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BitmapPalette ReadPalette ()
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{
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int colors = 1 << m_info.BPP;
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var palette_data = m_input.ReadBytes (colors * 3);
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var color_map = new Color[colors];
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int src = 0;
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for (int i = 0; i < colors; ++i)
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{
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color_map[i] = Color.FromRgb (palette_data[src+1], palette_data[src], palette_data[src+2]);
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src += 3;
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}
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return new BitmapPalette (color_map);
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}
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int[] m_offsets = new int[16];
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static readonly sbyte[] x_offs = { 0, 2, 4, 8, 0, 2, 0, 2, 4, 0, 2, 4, 0, 2, 4, 0 };
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static readonly sbyte[] y_offs = { 0, 0, 0, 0, -1, -1, -2, -2, -2, -4, -4, -4, -8, -8, -8, -16 };
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void PrepareOffsetsTable ()
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{
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for (int i = 0; i < 16; ++i)
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{
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int y = y_offs[i];
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int x = x_offs[i];
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m_offsets[i] = (m_stride * y - x) >> 1;
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}
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}
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}
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}
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