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263 lines
8.5 KiB
C#
263 lines
8.5 KiB
C#
//! \file ImageCZ.cs
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//! \date 2019 Mar 14
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//! \brief Real Live compressed image format.
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//
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// Copyright (C) 2019 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.Collections.Generic;
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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.Key
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{
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internal class CzMetaData : ImageMetaData
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{
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public int Version;
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public uint HeaderLength;
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}
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[Export(typeof(ImageFormat))]
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public class CzFormat : ImageFormat
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{
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public override string Tag { get { return "CZ"; } }
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public override string Description { get { return "Key compressed image format"; } }
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public override uint Signature { get { return 0x315A43; } } // 'CZ1'
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public CzFormat ()
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{
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Extensions = new[] { "cz", "cz0", "cz1", "cz3" };
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Signatures = new uint[] { 0x305A43, 0x315A43, 0x335A43 }; // 'CZ0', 'CZ1', 'CZ3'
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}
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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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var info = new CzMetaData {
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Width = header.ToUInt16 (8),
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Height = header.ToUInt16 (10),
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BPP = header.ToUInt16 (12),
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HeaderLength = header.ToUInt32 (4),
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Version = header[2] - '0',
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};
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if (info.HeaderLength > 0x18)
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{
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info.OffsetX = file.ReadInt16();
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info.OffsetY = file.ReadInt16();
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}
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return info;
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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 CzDecoder (file, (CzMetaData)info);
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return reader.Unpack();
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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 ("CzFormat.Write not implemented");
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}
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}
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internal class CzDecoder
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{
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IBinaryStream m_input;
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CzMetaData m_info;
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BitmapPalette Palette { get; set; }
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PixelFormat Format { get; set; }
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public CzDecoder (IBinaryStream input, CzMetaData info)
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{
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m_input = input;
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m_info = info;
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m_output = new byte[m_info.iWidth * m_info.iHeight * m_info.BPP / 8];
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Format = 8 == m_info.BPP ? PixelFormats.Indexed8 : PixelFormats.Bgra32;
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}
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byte[] m_output;
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int m_dst;
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public ImageData Unpack ()
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{
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m_input.Position = m_info.HeaderLength;
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if (8 == m_info.BPP)
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Palette = ImageFormat.ReadPalette (m_input.AsStream, 0x100, PaletteFormat.RgbA);
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switch (m_info.Version)
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{
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case 3: UnpackCz3(); break;
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case 2: UnpackCz2(); break;
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case 1: UnpackCz1(); break;
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case 0: UnpackCz0(); break;
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}
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if (32 == m_info.BPP)
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ConvertToBgrA();
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return ImageData.Create (m_info, Format, Palette, m_output);
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}
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void UnpackCz0 ()
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{
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m_input.Read (m_output, 0, m_output.Length);
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}
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void UnpackCz1 ()
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{
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int part_count = m_input.ReadInt32();
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var part_sizes = new int[part_count];
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int total_size = 0;
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for (int i = 0; i < part_count; ++i)
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{
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int part_size = m_input.ReadInt32() * 2;
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part_sizes[i] = part_size;
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m_input.ReadInt32(); // unpacked size
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total_size += part_size;
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}
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if (m_input.Position + total_size > m_input.Length)
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throw new InvalidFormatException();
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m_dst = 0;
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for (int i = 0; i < part_count; ++i)
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{
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m_chunkCache.Clear();
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var part = m_input.ReadBytes (part_sizes[i]);
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for (int j = 0; j < part.Length; j += 2)
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{
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byte ctl = part[j+1];
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if (0 == ctl)
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{
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m_output[m_dst++] = part[j];
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}
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else
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{
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m_dst += CopyRange (part, GetOffset (part, j), m_dst);
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}
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}
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}
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}
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void UnpackCz2 ()
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{
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UnpackCz1();
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int stride = m_info.iWidth * m_info.BPP / 8 / 4;
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var pixels = new uint[m_output.Length / 4];
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Buffer.BlockCopy (m_output, 0, pixels, 0, m_output.Length);
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int third = (m_info.iHeight + 2) / 3;
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for (int y = 0; y < m_info.iHeight; ++y)
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{
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int dst = m_info.iWidth * y;
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if (y % third != 0)
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{
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for (int x = 0; x < stride; ++x)
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{
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pixels[dst + x] += pixels[dst + x - stride];
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}
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}
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}
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Buffer.BlockCopy (pixels, 0, m_output, 0, m_output.Length);
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}
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void UnpackCz3 ()
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{
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UnpackCz1();
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int stride = m_info.iWidth * m_info.BPP / 8;
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int third = (m_info.iHeight + 2) / 3;
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for (int y = 0; y < m_info.iHeight; ++y)
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{
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int dst = y * stride;
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if (y % third != 0)
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{
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for (int x = 0; x < stride; ++x)
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{
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m_output[dst + x] += m_output[dst + x - stride];
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}
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}
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}
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}
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void ConvertToBgrA ()
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{
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for (int i = 0; i < m_output.Length; i += 4)
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{
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byte r = m_output[i];
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m_output[i] = m_output[i+2];
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m_output[i+2] = r;
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}
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}
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struct Range
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{
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public int Start;
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public int Length;
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}
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readonly Dictionary<int, Range> m_chunkCache = new Dictionary<int, Range>();
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static int GetOffset (byte[] input, int src)
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{
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return ((input[src] | input[src+1] << 8) - 0x101) * 2;
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}
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int CopyRange (byte[] input, int src, int dst)
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{
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Range range;
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if (m_chunkCache.TryGetValue (src, out range))
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{
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Binary.CopyOverlapped (m_output, range.Start, dst, range.Length);
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return range.Length;
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}
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int start_pos = dst;
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if (input[src+1] == 0)
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m_output[dst++] = input[src];
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else if (GetOffset (input, src) == src)
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m_output[dst++] = 0;
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else
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dst += CopyRange (input, GetOffset (input, src), dst);
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if (input[src+3] == 0)
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m_output[dst++] = input[src+2];
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else if (GetOffset (input, src+2) == src)
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m_output[dst++] = m_output[start_pos];
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else
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m_output[dst++] = CopyOne (input, GetOffset (input, src+2));
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range.Start = start_pos;
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range.Length = dst - start_pos;
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m_chunkCache[src] = range;
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return range.Length;
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}
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byte CopyOne (byte[] input, int src)
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{
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if (input[src+1] == 0)
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return input[src];
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else if (GetOffset (input, src) == src)
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return 0;
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else
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return CopyOne (input, GetOffset (input, src));
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}
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}
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}
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