From 7aed98ed2fcc26152b8bcd82afcc901c78e8990f Mon Sep 17 00:00:00 2001 From: morkt Date: Mon, 2 Nov 2015 05:51:04 +0400 Subject: [PATCH] implemented GYU image format. --- ArcFormats/ArcFormats.csproj | 2 + ArcFormats/ExHibit/ImageGYU.cs | 289 +++++++++++++++++++++++++++++++++ 2 files changed, 291 insertions(+) create mode 100644 ArcFormats/ExHibit/ImageGYU.cs diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj index 242739a9..a60017ed 100644 --- a/ArcFormats/ArcFormats.csproj +++ b/ArcFormats/ArcFormats.csproj @@ -74,8 +74,10 @@ + + diff --git a/ArcFormats/ExHibit/ImageGYU.cs b/ArcFormats/ExHibit/ImageGYU.cs new file mode 100644 index 00000000..b93e1487 --- /dev/null +++ b/ArcFormats/ExHibit/ImageGYU.cs @@ -0,0 +1,289 @@ +//! \file ImageGYU.cs +//! \date Mon Nov 02 00:38:41 2015 +//! \brief ExHIBIT 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.Imaging; +using System.Windows.Media; +using GameRes.Utility; +using GameRes.Compression; + +namespace GameRes.Formats.ExHibit +{ + internal class GyuMetaData : ImageMetaData + { + public int Flags; + public int CompressionMode; + public uint Key; + public int DataSize; + public int AlphaSize; + public int PaletteSize; + } + + [Export(typeof(ImageFormat))] + public class GyuFormat : ImageFormat + { + public override string Tag { get { return "GYU"; } } + public override string Description { get { return "ExHIBIT engine image format"; } } + public override uint Signature { get { return 0x1A555947; } } // 'GYU' + + public override ImageMetaData ReadMetaData (Stream stream) + { + using (var reader = new ArcView.Reader (stream)) + { + reader.ReadInt32(); + return new GyuMetaData + { + Flags = reader.ReadUInt16(), + CompressionMode = reader.ReadUInt16(), + Key = reader.ReadUInt32(), + BPP = reader.ReadInt32(), + Width = reader.ReadUInt32(), + Height = reader.ReadUInt32(), + DataSize = reader.ReadInt32(), + AlphaSize = reader.ReadInt32(), + PaletteSize = reader.ReadInt32(), + }; + } + } + + public override ImageData Read (Stream stream, ImageMetaData info) + { + var meta = (GyuMetaData)info; + if (0 == meta.Key) + throw new UnknownEncryptionScheme ("Unknown image encryption key"); + + var reader = new GyuReader (stream, meta); + reader.Unpack(); + return ImageData.CreateFlipped (meta, reader.Format, reader.Palette, reader.Data, reader.Stride); + } + + public override void Write (Stream file, ImageData image) + { + throw new System.NotImplementedException ("GyuFormat.Write not implemented"); + } + } + + internal sealed class GyuReader + { + GyuMetaData m_info; + Stream m_input; + byte[] m_output; + int m_width; + int m_height; + + public PixelFormat Format { get; private set; } + public BitmapPalette Palette { get; private set; } + public int Stride { get; private set; } + public byte[] Data { get { return m_output; } } + + public GyuReader (Stream input, GyuMetaData info) + { + m_info = info; + m_width = (int)info.Width; + m_height = (int)info.Height; + Stride = (m_width * info.BPP / 8 + 3) & ~3; + m_input = input; + if (0 != m_info.AlphaSize) + Format = PixelFormats.Bgra32; + else if (32 == m_info.BPP) + Format = PixelFormats.Bgr32; + else if (24 == m_info.BPP) + Format = PixelFormats.Bgr24; + else if (8 == m_info.BPP) + Format = PixelFormats.Indexed8; + else + throw new NotSupportedException ("Not supported GYU color depth"); + + if (8 == m_info.BPP && 0 == m_info.PaletteSize) + throw new InvalidFormatException(); + } + + public void Unpack () + { + m_input.Position = 0x24; + if (0 != m_info.PaletteSize) + Palette = ReadPalette (m_info.PaletteSize); + + var packed = new byte[m_info.DataSize]; + if (packed.Length != m_input.Read (packed, 0, packed.Length)) + throw new EndOfStreamException(); + + if (m_info.Key != 0xFFFFFFFF) + Deobfuscate (packed, m_info.Key); + + if (0x0100 == m_info.CompressionMode) + { + m_output = packed; + } + else + { + m_output = new byte[Stride * m_height]; + if (0x0800 == m_info.CompressionMode) + UnpackGyu (packed); + else + UnpackLzss (packed); + } + if (0 != m_info.AlphaSize) + ReadAlpha(); + } + + void UnpackLzss (byte[] packed) + { + using (var mem = new MemoryStream (packed)) + using (var lz = new LzssStream (mem)) + if (m_output.Length != lz.Read (m_output, 0, m_output.Length)) + throw new EndOfStreamException (); + } + + void UnpackGyu (byte[] packed) + { + using (var mem = new MemoryStream (packed)) + using (var bits = new MsbBitStream (mem)) + { + int dst = 0; + m_output[dst++] = (byte)mem.ReadByte(); + while (dst < m_output.Length) + { + int b = bits.GetNextBit(); + if (-1 == b) + throw new EndOfStreamException(); + if (1 == b) + { + m_output[dst++] = (byte)mem.ReadByte(); + continue; + } + int count; + int offset; + if (1 == bits.GetNextBit()) + { + count = mem.ReadByte() << 8; + count |= mem.ReadByte(); + offset = -1 << 13 | count >> 3; + count &= 7; + + if (0 == count) + { + ++count; + } + else + { + count = mem.ReadByte(); + if (0 == count) + break; + } + } + else + { + count = 1 + bits.GetBits (2); + offset = -1 << 8 | mem.ReadByte(); + } + + for (int i = 0; i <= count; ++i) + { + m_output[dst] = m_output[dst+offset]; + ++dst; + } + } + } + } + + BitmapPalette ReadPalette (int colors) + { + var palette_data = new byte[colors*4]; + if (palette_data.Length != m_input.Read (palette_data, 0, palette_data.Length)) + throw new InvalidFormatException(); + var palette = new Color[colors]; + for (int i = 0; i < palette.Length; ++i) + { + int c = i * 4; + palette[i] = Color.FromRgb (palette_data[c+2], palette_data[c+1], palette_data[c]); + } + return new BitmapPalette (palette); + } + + void ReadAlpha () + { + int alpha_stride = (m_width + 3) & ~3; + Stream alpha_stream; + if (m_info.AlphaSize == alpha_stride * m_height) + alpha_stream = new StreamRegion (m_input, m_input.Position, true); + else + alpha_stream = new LzssStream (m_input, LzssMode.Decompress, true); + using (alpha_stream) + { + int src_stride = Stride; + int new_stride = m_width * 4; + bool extend_alpha = 3 != m_info.Flags; + var alpha_line = new byte[alpha_stride]; + var pixels = new byte[new_stride * m_height]; + for (int y = 0; y < m_height; ++y) + { + int src = y * src_stride; + int dst = y * new_stride; + if (alpha_line.Length != alpha_stream.Read (alpha_line, 0, alpha_line.Length)) + throw new EndOfStreamException(); + for (int x = 0; x < m_width; ++x) + { + if (8 == m_info.BPP) + { + var color = Palette.Colors[m_output[src++]]; + pixels[dst++] = color.B; + pixels[dst++] = color.G; + pixels[dst++] = color.R; + } + else + { + pixels[dst++] = m_output[src++]; + pixels[dst++] = m_output[src++]; + pixels[dst++] = m_output[src++]; + } + int alpha = alpha_line[x]; + if (extend_alpha) + alpha = alpha >= 0x10 ? 0xFF : alpha * 0x10; + pixels[dst++] = (byte)alpha; + } + } + Stride = new_stride; + Palette = null; + m_output = pixels; + } + } + + static void Deobfuscate (byte[] data, uint key) + { + var mt = new MersenneTwister (key); + for (int n = 0; n < 10; ++n) + { + uint i1 = mt.Rand() % (uint)data.Length; + uint i2 = mt.Rand() % (uint)data.Length; + var tmp = data[i1]; + data[i1] = data[i2]; + data[i2] = tmp; + } + } + } +}