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288 lines
10 KiB
C#
288 lines
10 KiB
C#
//! \file ImageGYU.cs
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//! \date Mon Nov 02 00:38:41 2015
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//! \brief ExHIBIT engine image format.
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//
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// Copyright (C) 2015 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.Imaging;
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using System.Windows.Media;
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using GameRes.Utility;
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using GameRes.Compression;
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using GameRes.Cryptography;
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namespace GameRes.Formats.ExHibit
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{
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internal class GyuMetaData : ImageMetaData
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{
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public int Flags;
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public int CompressionMode;
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public uint Key;
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public int DataSize;
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public int AlphaSize;
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public int PaletteSize;
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}
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[Export(typeof(ImageFormat))]
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public class GyuFormat : ImageFormat
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{
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public override string Tag { get { return "GYU"; } }
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public override string Description { get { return "ExHIBIT engine image format"; } }
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public override uint Signature { get { return 0x1A555947; } } // 'GYU'
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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using (var reader = new ArcView.Reader (stream))
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{
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reader.ReadInt32();
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return new GyuMetaData
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{
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Flags = reader.ReadUInt16(),
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CompressionMode = reader.ReadUInt16(),
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Key = reader.ReadUInt32(),
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BPP = reader.ReadInt32(),
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Width = reader.ReadUInt32(),
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Height = reader.ReadUInt32(),
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DataSize = reader.ReadInt32(),
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AlphaSize = reader.ReadInt32(),
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PaletteSize = reader.ReadInt32(),
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};
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}
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}
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public override ImageData Read (Stream stream, ImageMetaData info)
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{
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var meta = (GyuMetaData)info;
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if (0 == meta.Key)
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throw new UnknownEncryptionScheme ("Unknown image encryption key");
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var reader = new GyuReader (stream, meta);
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reader.Unpack();
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return ImageData.CreateFlipped (meta, reader.Format, reader.Palette, reader.Data, 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 ("GyuFormat.Write not implemented");
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}
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}
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internal sealed class GyuReader
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{
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GyuMetaData m_info;
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Stream m_input;
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byte[] m_output;
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int m_width;
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int m_height;
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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; private set; }
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public byte[] Data { get { return m_output; } }
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public GyuReader (Stream input, GyuMetaData info)
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{
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m_info = info;
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m_width = (int)info.Width;
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m_height = (int)info.Height;
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Stride = (m_width * info.BPP / 8 + 3) & ~3;
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m_input = input;
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if (0 != m_info.AlphaSize)
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Format = PixelFormats.Bgra32;
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else if (32 == m_info.BPP)
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Format = PixelFormats.Bgr32;
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else if (24 == m_info.BPP)
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Format = PixelFormats.Bgr24;
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else if (8 == m_info.BPP)
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Format = PixelFormats.Indexed8;
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else
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throw new NotSupportedException ("Not supported GYU color depth");
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if (8 == m_info.BPP && 0 == m_info.PaletteSize)
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throw new InvalidFormatException();
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}
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public void Unpack ()
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{
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m_input.Position = 0x24;
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if (0 != m_info.PaletteSize)
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Palette = ReadPalette (m_info.PaletteSize);
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var packed = new byte[m_info.DataSize];
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if (packed.Length != m_input.Read (packed, 0, packed.Length))
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throw new EndOfStreamException();
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if (m_info.Key != 0xFFFFFFFF)
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Deobfuscate (packed, m_info.Key);
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if (0x0100 == m_info.CompressionMode)
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{
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m_output = packed;
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}
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else
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{
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m_output = new byte[Stride * m_height];
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if (0x0800 == m_info.CompressionMode)
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UnpackGyu (packed);
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else
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UnpackLzss (packed);
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}
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if (0 != m_info.AlphaSize)
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ReadAlpha();
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}
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void UnpackLzss (byte[] packed)
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{
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using (var mem = new MemoryStream (packed))
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using (var lz = new LzssStream (mem))
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if (m_output.Length != lz.Read (m_output, 0, m_output.Length))
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throw new EndOfStreamException ();
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}
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void UnpackGyu (byte[] packed)
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{
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using (var mem = new MemoryStream (packed, 4, packed.Length-4))
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using (var bits = new MsbBitStream (mem))
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{
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int dst = 0;
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m_output[dst++] = (byte)mem.ReadByte();
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while (dst < m_output.Length)
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{
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int b = bits.GetNextBit();
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if (-1 == b)
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throw new EndOfStreamException();
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if (1 == b)
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{
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m_output[dst++] = (byte)mem.ReadByte();
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continue;
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}
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int count;
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int offset;
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if (1 == bits.GetNextBit())
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{
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count = mem.ReadByte() << 8;
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count |= mem.ReadByte();
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offset = -1 << 13 | count >> 3;
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count &= 7;
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if (0 != count)
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{
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++count;
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}
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else
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{
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count = mem.ReadByte();
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if (0 == count)
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break;
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}
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}
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else
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{
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count = 1 + bits.GetBits (2);
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offset = -1 << 8 | mem.ReadByte();
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}
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Binary.CopyOverlapped (m_output, dst+offset, dst, ++count);
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dst += count;
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}
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}
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}
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BitmapPalette ReadPalette (int colors)
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{
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var palette_data = new byte[colors*4];
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if (palette_data.Length != m_input.Read (palette_data, 0, palette_data.Length))
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throw new InvalidFormatException();
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var palette = new Color[colors];
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for (int i = 0; i < palette.Length; ++i)
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{
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int c = i * 4;
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palette[i] = Color.FromRgb (palette_data[c+2], palette_data[c+1], palette_data[c]);
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}
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return new BitmapPalette (palette);
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}
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void ReadAlpha ()
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{
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int alpha_stride = (m_width + 3) & ~3;
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Stream alpha_stream;
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if (m_info.AlphaSize == alpha_stride * m_height)
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alpha_stream = new StreamRegion (m_input, m_input.Position, true);
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else
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alpha_stream = new LzssStream (m_input, LzssMode.Decompress, true);
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using (alpha_stream)
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{
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int src_stride = Stride;
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int new_stride = m_width * 4;
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bool extend_alpha = 3 != m_info.Flags;
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var alpha_line = new byte[alpha_stride];
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var pixels = new byte[new_stride * m_height];
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for (int y = 0; y < m_height; ++y)
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{
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int src = y * src_stride;
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int dst = y * new_stride;
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if (alpha_line.Length != alpha_stream.Read (alpha_line, 0, alpha_line.Length))
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throw new EndOfStreamException();
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for (int x = 0; x < m_width; ++x)
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{
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if (8 == m_info.BPP)
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{
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var color = Palette.Colors[m_output[src++]];
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pixels[dst++] = color.B;
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pixels[dst++] = color.G;
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pixels[dst++] = color.R;
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}
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else
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{
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pixels[dst++] = m_output[src++];
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pixels[dst++] = m_output[src++];
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pixels[dst++] = m_output[src++];
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}
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int alpha = alpha_line[x];
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if (extend_alpha)
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alpha = alpha >= 0x10 ? 0xFF : alpha * 0x10;
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pixels[dst++] = (byte)alpha;
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}
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}
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Stride = new_stride;
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Palette = null;
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m_output = pixels;
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}
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}
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static void Deobfuscate (byte[] data, uint key)
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{
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var mt = new MersenneTwister (key);
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for (int n = 0; n < 10; ++n)
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{
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uint i1 = mt.Rand() % (uint)data.Length;
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uint i2 = mt.Rand() % (uint)data.Length;
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var tmp = data[i1];
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data[i1] = data[i2];
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data[i2] = tmp;
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}
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}
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}
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}
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