mirror of
https://github.com/crskycode/GARbro.git
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264 lines
9.9 KiB
C#
264 lines
9.9 KiB
C#
//! \file ImageMG2.cs
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//! \date Sat Feb 25 03:08:01 2017
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//! \brief Valkyria 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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namespace GameRes.Formats.Valkyria
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{
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internal class Mg2MetaData : ImageMetaData
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{
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public int ImageLength;
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public int AlphaLength;
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public IMg2Scheme Scheme;
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public ImageFormat Format;
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}
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internal interface IMg2Scheme
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{
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Mg2EncryptedStream CreateStream (Stream main, int offset, int length, int key);
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ImageData CreateImage (BitmapSource bitmap, ImageMetaData info);
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}
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[Export(typeof(ImageFormat))]
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public class Mg2Format : ImageFormat
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{
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public override string Tag { get { return "MG2"; } }
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public override string Description { get { return "Valkyria image format"; } }
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public override uint Signature { get { return 0x4F43494D; } } // 'MICO'
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static readonly IMg2Scheme[] KnownSchemes = { new Mg2SchemeV1(), new Mg2SchemeV2(), new Mg2SchemeV3() };
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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var header = file.ReadHeader (0x10);
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if (!header.AsciiEqual (4, "CG01") && !header.AsciiEqual (4, "CG02"))
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return null;
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int length = header.ToInt32 (8);
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foreach (var scheme in KnownSchemes)
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{
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using (var input = scheme.CreateStream (file.AsStream, 0x10, length, length))
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using (var img = new BinaryStream (input, file.Name))
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{
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ImageFormat format;
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if (Png.Signature == img.Signature)
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format = Png;
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else if (0xE0FFD8FF == img.Signature)
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format = Jpeg;
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else
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continue;
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var info = format.ReadMetaData (img);
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if (null == info)
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continue;
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return new Mg2MetaData
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{
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Width = info.Width,
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Height = info.Height,
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OffsetX = info.OffsetX,
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OffsetY = info.OffsetY,
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BPP = info.BPP,
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ImageLength = length,
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AlphaLength = header.ToInt32 (12),
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Scheme = scheme,
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Format = format,
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};
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}
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}
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return null;
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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 meta = (Mg2MetaData)info;
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var frame = ReadBitmapSource (file.AsStream, meta);
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return meta.Scheme.CreateImage (frame, meta);
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}
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BitmapSource ReadBitmapSource (Stream file, Mg2MetaData meta)
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{
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BitmapSource frame;
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using (var input = meta.Scheme.CreateStream (file, 0x10, meta.ImageLength, meta.ImageLength))
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using (var img = new BinaryStream (input, meta.FileName))
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{
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var image = meta.Format.Read (img, meta);
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frame = image.Bitmap;
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if (0 == meta.AlphaLength)
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return frame;
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}
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if (frame.Format.BitsPerPixel != 32)
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frame = new FormatConvertedBitmap (frame, PixelFormats.Bgr32, null, 0);
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int stride = frame.PixelWidth * 4;
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var pixels = new byte[stride * (int)meta.Height];
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frame.CopyPixels (pixels, stride, 0);
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using (var input = meta.Scheme.CreateStream (file, 0x10+meta.ImageLength, meta.AlphaLength, meta.ImageLength))
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{
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var decoder = BitmapDecoder.Create (input, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
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BitmapSource alpha_frame = decoder.Frames[0];
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if (alpha_frame.PixelWidth != frame.PixelWidth || alpha_frame.PixelHeight != frame.PixelHeight)
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return BitmapSource.Create ((int)meta.Width, (int)meta.Height,
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ImageData.DefaultDpiX, ImageData.DefaultDpiY,
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PixelFormats.Bgr32, null, pixels, stride);
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alpha_frame = new FormatConvertedBitmap (alpha_frame, PixelFormats.Gray8, null, 0);
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var alpha = new byte[alpha_frame.PixelWidth * alpha_frame.PixelHeight];
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alpha_frame.CopyPixels (alpha, alpha_frame.PixelWidth, 0);
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int src = 0;
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for (int dst = 3; dst < pixels.Length; dst += 4)
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{
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pixels[dst] = alpha[src++];
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}
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return BitmapSource.Create ((int)meta.Width, (int)meta.Height,
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ImageData.DefaultDpiX, ImageData.DefaultDpiY,
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PixelFormats.Bgra32, null, pixels, stride);
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}
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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 ("Mg2Format.Write not implemented");
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}
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}
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internal class Mg2EncryptedStream : StreamRegion
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{
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readonly byte m_version;
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readonly int m_threshold;
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readonly byte m_key0;
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readonly byte m_key1;
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protected Mg2EncryptedStream (Stream main, int offset, int length, byte version, int threshold, byte key0, byte key1)
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: base (main, offset, length, true)
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{
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m_version = version;
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m_threshold = threshold;
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m_key0 = key0;
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m_key1 = key1;
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}
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public static Mg2EncryptedStream CreateV1 (Stream main, int offset, int length)
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{
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return new Mg2EncryptedStream(main, offset, length, 1, length / 5, 0, 0);
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}
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public static Mg2EncryptedStream CreateV2 (Stream main, int offset, int length)
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{
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return new Mg2EncryptedStream( main, offset, length, 2, Math.Min(25, length), (byte)length, 0);
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}
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public static Mg2EncryptedStream CreateV3 (Stream main, int offset, int length, int key)
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{
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return new Mg2EncryptedStream(main, offset, length, 3, 0, (byte)(key >> 1), (byte)((key & 1) + (key >> 3)));
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}
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public override int Read (byte[] buffer, int offset, int count)
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{
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long pos = Position;
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int read = base.Read(buffer, offset, count);
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if (m_version == 3)
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{
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for (int i = 0; i < read; ++i)
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{
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buffer[offset+i] ^= (byte)((pos >> 4) ^ (pos + m_key0) ^ m_key1);
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pos++;
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}
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}
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else
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{
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for (int i = 0; i < read && pos < m_threshold; ++i)
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buffer[offset+i] ^= (byte)(m_key0 + pos++);
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}
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return read;
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}
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public override int ReadByte ()
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{
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long pos = Position;
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int b = base.ReadByte();
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if (m_version == 3)
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{
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b ^= (byte)((pos >> 4) ^ (pos + m_key0) ^ m_key1);
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}
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else
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{
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if (b != -1 && pos < m_threshold)
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b ^= (byte)(m_key0 + pos);
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}
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return b;
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}
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}
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internal class Mg2SchemeV1 : IMg2Scheme
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{
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public Mg2EncryptedStream CreateStream (Stream main, int offset, int length, int key)
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{
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return Mg2EncryptedStream.CreateV1 (main, offset, length);
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}
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public ImageData CreateImage (BitmapSource frame, ImageMetaData info)
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{
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frame.Freeze();
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return new ImageData (frame, info);
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}
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}
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internal class Mg2SchemeV2 : IMg2Scheme
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{
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public Mg2EncryptedStream CreateStream (Stream main, int offset, int length, int key)
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{
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return Mg2EncryptedStream.CreateV2 (main, offset, length);
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}
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public ImageData CreateImage (BitmapSource frame, ImageMetaData info)
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{
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frame = new TransformedBitmap (frame, new ScaleTransform { ScaleY = -1 });
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frame.Freeze();
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return new ImageData (frame, info);
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}
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}
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internal class Mg2SchemeV3 : IMg2Scheme
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{
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public Mg2EncryptedStream CreateStream (Stream main, int offset, int length, int key)
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{
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return Mg2EncryptedStream.CreateV3 (main, offset, length, key);
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}
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public ImageData CreateImage (BitmapSource frame, ImageMetaData info)
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{
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frame = new TransformedBitmap(frame, new ScaleTransform { ScaleY = -1 });
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frame.Freeze();
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return new ImageData(frame, info);
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}
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}
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}
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