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306 lines
11 KiB
C#
306 lines
11 KiB
C#
//! \file ImageLAG.cs
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//! \date 2020 Mar 29
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//! \brief Strikes image format.
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//
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// Copyright (C) 2020 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.Compression;
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using GameRes.Utility;
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namespace GameRes.Formats.Strikes
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{
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internal class LagMetaData : ImageMetaData
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{
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public int ScanLineSize;
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public bool HasPalette;
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public bool HasAlpha;
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public int LastChunkSize;
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public int ChunkCount;
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}
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[Export(typeof(ImageFormat))]
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public class LagFormat : ImageFormat
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{
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public override string Tag { get { return "LAG"; } }
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public override string Description { get { return "Strikes image format"; } }
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public override uint Signature { get { return 0x414C1001; } }
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public override ImageMetaData ReadMetaData (IBinaryStream file)
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{
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var header = file.ReadHeader (0x20);
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int bpp = header[10] & 0x1F;
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if (!(bpp == 24 || bpp == 16 || bpp == 8))
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return null;
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return new LagMetaData
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{
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Width = BigEndian.ToUInt16 (header, 4),
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Height = BigEndian.ToUInt16 (header, 6),
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BPP = bpp,
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ScanLineSize = BigEndian.ToUInt16 (header, 8),
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HasPalette = (header[10] & 0x80) != 0,
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HasAlpha = (header[10] & 0x20) != 0,
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LastChunkSize = BigEndian.ToInt32 (header, 0x14),
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ChunkCount = BigEndian.ToUInt16 (header, 0x18),
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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 LagReader (file, (LagMetaData)info);
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var pixels = reader.Unpack();
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return ImageData.Create (info, reader.Format, reader.Palette, pixels);
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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 ("LagFormat.Write not implemented");
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}
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}
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internal class LagReader
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{
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IBinaryStream m_input;
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byte[] m_output;
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LagMetaData m_info;
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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 LagReader (IBinaryStream input, LagMetaData 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[4 * m_info.Width * m_info.Height];
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switch (m_info.BPP)
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{
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case 24:
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if (m_info.HasAlpha)
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Format = PixelFormats.Bgra32;
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else
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Format = PixelFormats.Bgr24;
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break;
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default:
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throw new NotImplementedException ("Not supported LAG color depth.");
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}
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}
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public byte[] Unpack ()
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{
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m_input.Position = 0x20;
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if (m_info.HasPalette)
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Palette = ImageFormat.ReadPalette (m_input.AsStream, 0x100, PaletteFormat.Bgr);
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var buffer = ReadChunks();
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using (var input = new BinMemoryStream (buffer))
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{
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int g_pos = m_info.iWidth;
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int b_pos = m_info.iWidth * 2;
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int a_pos = m_info.iWidth * 3;
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var scanline = new byte[m_info.ScanLineSize * 2];
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var unpack_buffer = new byte[scanline.Length];
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int dst = 0;
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for (int y = 0; y < m_info.iHeight; ++y)
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{
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int packed_size = Binary.BigEndian (input.ReadInt24() << 8);
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byte flags = input.ReadUInt8();
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if (packed_size > scanline.Length)
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break;
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input.Read (scanline, 0, packed_size);
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if ((flags & 4) != 0) // LZSS compression
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{
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packed_size = PckOpener.LzssUnpack (scanline, packed_size, unpack_buffer);
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var swap = scanline;
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scanline = unpack_buffer;
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unpack_buffer = swap;
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}
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if ((flags & 2) != 0) // RLE compression
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{
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packed_size = RleUnpack (scanline, packed_size, unpack_buffer);
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var swap = scanline;
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scanline = unpack_buffer;
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unpack_buffer = swap;
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}
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if ((flags & 1) != 0)
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{
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RestoreScanline (scanline, packed_size);
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}
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switch (m_info.BPP)
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{
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case 24:
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{
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int src_r = 0;
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int src_g = g_pos;
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int src_b = b_pos;
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int src_a = a_pos;
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for (int x = 0; x < m_info.iWidth; ++x)
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{
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m_output[dst++] = scanline[src_b++];
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m_output[dst++] = scanline[src_g++];
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m_output[dst++] = scanline[src_r++];
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if (m_info.HasAlpha)
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m_output[dst++] = scanline[src_a++];
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}
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break;
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}
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default:
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throw new NotImplementedException ("Not supported LAG color depth.");
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}
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}
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}
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return m_output;
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}
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byte[] ReadChunks ()
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{
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var buffer = new byte[0x10000 * m_info.ChunkCount + m_info.LastChunkSize];
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int dst = 0;
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for (int i = 0; i <= m_info.ChunkCount; ++i)
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{
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int length = Binary.BigEndian (m_input.ReadInt32());
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bool is_compressed = length < 0;
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length &= 0x7FFFFFFF;
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if (is_compressed)
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{
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int unpacked_size = Math.Min (0x10000, buffer.Length - dst);
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using (var region = new StreamRegion (m_input.AsStream, m_input.Position, length, true))
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using (var zinput = new ZLibStream (region, CompressionMode.Decompress, true))
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{
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dst += zinput.Read (buffer, dst, unpacked_size);
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}
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}
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else
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{
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dst += m_input.Read (buffer, dst, length);
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}
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}
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return buffer;
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}
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int RleUnpack (byte[] input, int in_length, byte[] output)
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{
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int dst = 0;
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int src = 0;
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while (src < in_length && dst < output.Length)
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{
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byte code = input[src++];
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if (src >= in_length)
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break;
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int count = (code & 0x3F) + 1;
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if (dst + count > output.Length)
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break;
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int val;
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int i;
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switch ((code & 0xC0) >> 6)
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{
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case 0:
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for (i = 0; i < count; ++i)
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{
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int n = i & 3;
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if (n == 0)
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val = (input[src] & 0xC0) >> 6;
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else if (n == 1)
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val = (input[src] & 0x30) >> 4;
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else if (n == 2)
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val = (input[src] & 0xC) >> 2;
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else
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val = input[src++] & 3;
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if ((val & 2) != 0)
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val |= 0xFC;
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output[dst++] = (byte)val;
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}
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if ((i & 3) != 0)
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++src;
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break;
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case 1:
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for (i = 0; i < count; ++i)
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{
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if ((i & 1) != 0)
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val = input[src++] & 0xF;
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else
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val = (input[src] & 0xF0) >> 4;
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if ((val & 8) != 0)
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val |= 0xF0;
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output[dst++] = (byte)val;
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}
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if ((i & 1) != 0)
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++src;
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break;
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case 2:
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for (i = 0; i < count; ++i)
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{
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int n = i & 3;
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if (n == 0)
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{
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val = (input[src] & 0xFC) >> 2;
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}
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else if (n == 1)
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{
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byte v = input[src++];
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val = ((input[src] & 0xF0) >> 4) | (v & 3) << 4;
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}
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else if (n == 2)
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{
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byte v = input[src++];
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val = ((input[src] & 0xC0) >> 6) | (v & 0xF) << 2;
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}
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else
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{
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val = input[src++] & 0x3F;
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}
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if ((val & 0x20) != 0)
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val |= 0xC0;
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output[dst++] = (byte)val;
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}
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if ((i & 3) != 0)
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++src;
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break;
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case 3:
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Buffer.BlockCopy (input, src, output, dst, count);
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src += count;
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dst += count;
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break;
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}
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}
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return dst;
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}
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void RestoreScanline (byte[] input, int in_length)
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{
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for (int pos = 1; pos < in_length; ++pos)
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{
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input[pos] += input[pos-1];
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}
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}
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}
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}
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