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353 lines
13 KiB
C#
353 lines
13 KiB
C#
//! \file ImageSG.cs
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//! \date Mon Sep 12 14:37:19 2016
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//! \brief 'fSG' image format.
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//
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// Copyright (C) 2016 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.Utility;
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namespace GameRes.Formats.Ivory
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{
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internal class SgMetaData : ImageMetaData
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{
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public SgType Type;
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public int DataOffset;
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public int DataSize;
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public int RgbMode;
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public uint JpegKey;
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}
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internal enum SgType
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{
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cRGB, cJPG
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}
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[Export(typeof(ImageFormat))]
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public class SgFormat : ImageFormat
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{
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public override string Tag { get { return "SG"; } }
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public override string Description { get { return "Ivory image format"; } }
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public override uint Signature { get { return 0x20475366; } } // 'fSG '
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public override ImageMetaData ReadMetaData (IBinaryStream stream)
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{
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stream.Position = 8;
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var header = stream.ReadBytes (0x24);
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if (header.Length != 0x24)
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return null;
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int header_size = LittleEndian.ToInt32 (header, 8);
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if (Binary.AsciiEqual (header, "cRGB"))
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return new SgMetaData
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{
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Type = SgType.cRGB,
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Width = LittleEndian.ToUInt16 (header, 0x1C),
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Height = LittleEndian.ToUInt16 (header, 0x1E),
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BPP = LittleEndian.ToUInt16 (header, 0x22),
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OffsetX = LittleEndian.ToInt16 (header, 0x18),
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OffsetY = LittleEndian.ToInt16 (header, 0x1A),
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RgbMode = LittleEndian.ToUInt16 (header, 0x10),
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DataOffset = 8 + header_size,
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DataSize = LittleEndian.ToInt32 (header, 0xC),
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};
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else if (Binary.AsciiEqual (header, "cJPG"))
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return new SgMetaData
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{
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Type = SgType.cJPG,
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Width = LittleEndian.ToUInt16 (header, 0x18),
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Height = LittleEndian.ToUInt16 (header, 0x1A),
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BPP = 24,
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OffsetX = LittleEndian.ToInt16 (header, 0x14),
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OffsetY = LittleEndian.ToInt16 (header, 0x16),
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DataOffset = 8 + header_size,
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DataSize = LittleEndian.ToInt32 (header, 0xC),
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JpegKey = LittleEndian.ToUInt32 (header, 0x20),
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};
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else
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return null;
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}
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public override ImageData Read (IBinaryStream stream, ImageMetaData info)
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{
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var meta = (SgMetaData)info;
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if (SgType.cRGB == meta.Type)
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{
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using (var reader = new SgRgbReader (stream, meta))
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{
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reader.Unpack();
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return ImageData.Create (info, reader.Format, reader.Palette, reader.Data, reader.Stride);
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}
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}
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else
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{
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return ReadJpeg (stream, meta);
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}
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}
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ImageData ReadJpeg (IBinaryStream stream, SgMetaData info)
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{
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stream.Position = info.DataOffset;
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var input = stream.ReadBytes (info.DataSize);
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if (input.Length != info.DataSize)
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throw new EndOfStreamException();
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PakOpener.Decrypt (input, info.JpegKey);
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using (var img = new MemoryStream (input))
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{
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var decoder = new JpegBitmapDecoder (img, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
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var frame = decoder.Frames[0];
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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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public override void Write (Stream file, ImageData image)
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{
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throw new System.NotImplementedException ("SgFormat.Write not implemented");
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}
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}
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internal sealed class SgRgbReader : IDisposable
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{
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IBinaryStream m_input;
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SgMetaData m_info;
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int m_width;
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int m_height;
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int m_stride;
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int m_channels;
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byte[] m_output;
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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 byte[] Data { get { return m_output; } }
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public int Stride { get { return m_stride; } }
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public SgRgbReader (IBinaryStream input, SgMetaData info)
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{
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if (info.Type != SgType.cRGB || !(0x18 == info.BPP || 0x20 == info.BPP))
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throw new InvalidFormatException();
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m_input = input;
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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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m_stride = m_width * 4;
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m_channels = m_info.BPP / 8;
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}
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public void Unpack ()
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{
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m_input.Position = m_info.DataOffset;
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switch (m_info.RgbMode)
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{
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case 0: UnpackV0(); break;
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case 1: UnpackV1(); break;
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case 2:
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if (4 == m_channels)
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UnpackV2Alpha();
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else
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UnpackV2();
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break;
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default:
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throw new NotImplementedException (string.Format ("sRGB image type {0} not implemented", m_info.RgbMode));
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}
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}
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void UnpackV1 ()
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{
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Format = 3 == m_channels ? PixelFormats.Bgr32 : PixelFormats.Bgra32;
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m_output = new byte[m_stride * m_height];
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var line = new byte[m_stride];
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int dst = 0;
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int alpha_pos = m_width * 3;
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for (int y = 0; y < m_height; ++y)
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{
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int line_pos = 0;
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for (int c = 0; c < m_channels; ++c)
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{
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for (int x = 0; x < m_width; )
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{
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byte ctl = m_input.ReadUInt8();
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int count = ctl & 0x3F;
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if (0 != (ctl & 0x40))
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{
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count <<= 8;
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count |= m_input.ReadUInt8();
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}
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if (0 != (ctl & 0x80))
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{
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byte v = m_input.ReadUInt8();
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for (int i = 0; i < count; ++i)
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line[line_pos++] = v;
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}
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else
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{
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m_input.Read (line, line_pos, count);
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line_pos += count;
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}
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x += count;
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}
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}
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line_pos = 0;
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for (int x = 0; x < m_width; ++x)
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{
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m_output[dst ] = line[line_pos];
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m_output[dst+1] = line[line_pos+m_width];
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m_output[dst+2] = line[line_pos+m_width*2];
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if (4 == m_channels)
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{
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m_output[dst+3] = line[line_pos+alpha_pos];
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}
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dst += 4;
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++line_pos;
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}
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}
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}
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void UnpackV0 ()
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{
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Format = 3 == m_channels ? PixelFormats.Bgr24 : PixelFormats.Bgra32;
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m_stride = m_width * m_channels;
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m_output = m_input.ReadBytes (m_stride * m_height);
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}
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void UnpackV2 ()
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{
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m_stride = m_width;
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m_output = new byte[m_width * m_height];
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Format = PixelFormats.Indexed8;
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Palette = ImageFormat.ReadPalette (m_input.AsStream);
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var index = new int[m_height];
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for (int i = 0; i < m_height; ++i)
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index[i] = m_input.ReadInt32();
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var data_pos = m_input.Position;
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int dst = 0;
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for (int y = 0; y < m_height; ++y)
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{
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m_input.Position = data_pos + index[y];
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for (int x = 0; x < m_width; )
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{
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int ctl = m_input.ReadUInt8();
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int count = ctl >> 2;
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if (0 != (ctl & 2))
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{
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count |= m_input.ReadUInt8() << 6;
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}
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count = Math.Min (count, m_width - x);
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x += count;
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if (0 != (ctl & 1))
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{
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byte c = m_input.ReadUInt8();
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for (int i = 0; i < count; ++i)
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m_output[dst++] = c;
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}
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else
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{
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m_input.Read (m_output, dst, count);
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dst += count;
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}
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}
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}
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}
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void UnpackV2Alpha ()
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{
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m_output = new byte[m_stride * m_height];
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Format = PixelFormats.Bgra32;
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var palette = ImageFormat.ReadColorMap (m_input.AsStream);
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var index = new int[m_height];
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for (int i = 0; i < m_height; ++i)
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index[i] = m_input.ReadInt32();
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var data_pos = m_input.Position;
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int dst = 0;
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using (var bits = new LsbBitStream (m_input.AsStream, true))
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{
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for (int y = 0; y < m_height; ++y)
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{
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bits.Input.Position = data_pos + index[y];
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bits.Reset();
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for (int x = 0; x < m_width; )
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{
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int ctl = bits.GetBits (2);
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int count;
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if (0 != (ctl & 2))
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{
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count = bits.GetBits (10);
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}
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else
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{
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count = bits.GetBits (2);
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}
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count = Math.Min (count, m_width - x);
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x += count;
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if (0 != (ctl & 1))
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{
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byte a = (byte)bits.GetBits (4);
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if (a != 0)
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a = (byte)((a << 4) | 0xF);
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int c = bits.GetBits (8);
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if (-1 == c)
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throw new EndOfStreamException();
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var color = palette[c];
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for (int i = 0; i < count; ++i)
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{
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m_output[dst++] = color.B;
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m_output[dst++] = color.G;
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m_output[dst++] = color.R;
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m_output[dst++] = a;
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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 < count; ++i)
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{
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int a = bits.GetBits (4);
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if (a != 0)
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a = (a << 4) | 0xF;
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int c = bits.GetBits (8);
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if (-1 == c)
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throw new EndOfStreamException();
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var color = palette[c];
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m_output[dst++] = color.B;
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m_output[dst++] = color.G;
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m_output[dst++] = color.R;
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m_output[dst++] = (byte)a;
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}
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}
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}
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}
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}
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}
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#region IDisposable Members
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public void Dispose ()
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{
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}
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#endregion
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}
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}
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