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447 lines
16 KiB
C#
447 lines
16 KiB
C#
//! \file ImageDRG.cs
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//! \date Fri Aug 22 05:58:40 2014
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//! \brief Digital Romance System image format implementation.
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//
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// Copyright (C) 2014 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.Text;
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using System.Windows;
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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.DRS
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{
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[Export(typeof(ImageFormat))]
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public class DrgFormat : ImageFormat
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{
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public override string Tag { get { return "DRG"; } }
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public override string Description { get { return "Digital Romance System image format"; } }
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public override uint Signature { get { return ~0x4c4c5546u; } } // 'FULL'
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public DrgFormat ()
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{
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Signatures = new uint[] { ~0x4c4c5546u, ~0x45555254u, ~0x48474948u, ~0x47363532u };
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}
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public override void Write (Stream file, ImageData image)
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{
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using (var writer = new Writer (file))
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{
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writer.Pack (image.Bitmap);
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}
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}
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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uint signature = ~FormatCatalog.ReadSignature (stream);
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int bpp;
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switch (signature)
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{
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case 0x4c4c5546: /* fall through */
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case 0x45555254: bpp = 24; break;
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case 0x48474948: bpp = 16; break;
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case 0x47363532: bpp = 8; break;
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default: return null;
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}
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using (var input = new BinaryReader (stream, Encoding.ASCII, true))
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{
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uint width, height;
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if (8 != bpp)
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{
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width = input.ReadUInt16();
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height = input.ReadUInt16();
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}
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else
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{
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width = input.ReadUInt32();
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height = input.ReadUInt32();
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}
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return new ImageMetaData {
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Width = width,
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Height = height,
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BPP = bpp,
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};
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}
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}
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public override ImageData Read (Stream file, ImageMetaData info)
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{
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PixelFormat format;
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BitmapPalette bitmap_palette = null;
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int stride = (int)info.Width*((info.BPP+7)/8);
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if (8 == info.BPP)
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{
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file.Position = 44;
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format = PixelFormats.Indexed8;
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var palette_data = new byte[0x400];
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if (palette_data.Length != file.Read (palette_data, 0, palette_data.Length))
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throw new InvalidFormatException();
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var palette = new Color[256];
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for (int i = 0; i < 256; ++i)
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{
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palette[i] = Color.FromRgb (palette_data[i*4+2], palette_data[i*4+1], palette_data[i*4]);
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}
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bitmap_palette = new BitmapPalette (palette);
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}
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else
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{
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file.Position = 8;
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if (24 == info.BPP)
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format = PixelFormats.Bgr24;
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else
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format = PixelFormats.Bgr565;
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}
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var pixel_data = DecodeStream (file, stride*(int)info.Height);
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if (null == pixel_data)
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throw new InvalidFormatException();
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var bitmap = BitmapSource.Create ((int)info.Width, (int)info.Height, 96, 96,
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format, bitmap_palette, pixel_data, (int)stride);
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bitmap.Freeze();
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return new ImageData (bitmap, info);
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}
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byte[] DecodeStream (Stream input, int pixel_count)
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{
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byte[] output = new byte[pixel_count];
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for (int out_pos = 0; pixel_count > 0; )
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{
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int opcode = input.ReadByte ();
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if (-1 == opcode)
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break;
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int count, src_offset;
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switch (opcode)
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{
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case 0:
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count = input.ReadByte ();
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src_offset = out_pos - 3;
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if (count < 0 || count * 3 > pixel_count || src_offset < 0)
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return null;
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for (int i = 0; i < count; ++i)
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{
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Buffer.BlockCopy (output, src_offset, output, out_pos, 3);
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out_pos += 3;
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}
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pixel_count -= count * 3;
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break;
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case 1:
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count = 3 * input.ReadByte ();
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src_offset = out_pos - 3 * input.ReadByte ();
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if (count < 0 || count > pixel_count || src_offset < 0 || src_offset == out_pos)
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return null;
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Binary.CopyOverlapped (output, src_offset, out_pos, count);
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out_pos += count;
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pixel_count -= count;
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break;
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case 2:
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{
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count = 3 * input.ReadByte ();
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int off_lo = input.ReadByte ();
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int off_hi = input.ReadByte ();
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src_offset = out_pos - 3 * (off_hi << 8 | off_lo);
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if (count < 0 || count > pixel_count || src_offset < 0 || src_offset == out_pos)
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return null;
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Binary.CopyOverlapped (output, src_offset, out_pos, count);
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out_pos += count;
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pixel_count -= count;
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break;
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}
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case 3:
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count = 3;
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src_offset = out_pos - 3 * input.ReadByte ();
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if (count > pixel_count || src_offset < 0 || src_offset == out_pos)
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return null;
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Buffer.BlockCopy (output, src_offset, output, out_pos, count);
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out_pos += count;
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pixel_count -= count;
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break;
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case 4:
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{
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count = 3;
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int off_lo = input.ReadByte ();
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int off_hi = input.ReadByte ();
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src_offset = out_pos - 3 * (off_hi << 8 | off_lo);
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if (count > pixel_count || src_offset < 0 || src_offset == out_pos)
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return null;
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Buffer.BlockCopy (output, src_offset, output, out_pos, count);
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out_pos += count;
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pixel_count -= count;
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break;
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}
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default:
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count = 3*(opcode - 4);
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if (count > pixel_count)
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return null;
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for (int i = 0; i < count; ++i)
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{
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output[out_pos++] = (byte)input.ReadByte ();
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}
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pixel_count -= count;
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break;
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}
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}
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return output;
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}
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internal class Writer : IDisposable
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{
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BinaryWriter m_out;
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uint[] m_input;
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const int MaxWindowSize = 0xfffe;
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const int MaxMatchSize = 0xff;
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struct WindowPosition
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{
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public ushort Offset;
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public ushort Length;
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}
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public Writer (Stream output)
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{
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m_out = new BinaryWriter (output, Encoding.ASCII, true);
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}
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void WriteHeader (int width, int height)
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{
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m_out.Write (~0x4c4c5546u);
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m_out.Write ((ushort)width);
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m_out.Write ((ushort)height);
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}
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void PrepareInput (BitmapSource bitmap)
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{
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int width = bitmap.PixelWidth;
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int height = bitmap.PixelHeight;
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int pixels = width*height;
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m_input = new uint[pixels];
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if (bitmap.Format != PixelFormats.Bgr32)
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{
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var converted_bitmap = new FormatConvertedBitmap();
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converted_bitmap.BeginInit();
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converted_bitmap.Source = bitmap;
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converted_bitmap.DestinationFormat = PixelFormats.Bgr32;
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converted_bitmap.EndInit();
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bitmap = converted_bitmap;
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}
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unsafe
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{
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fixed (uint* buffer = m_input)
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{
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bitmap.CopyPixels (Int32Rect.Empty, (IntPtr)buffer, pixels*4, width*4);
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}
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}
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WriteHeader (width, height);
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}
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List<byte> m_buffer = new List<byte>();
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int m_buffer_size;
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Dictionary<uint, SortedSet<int>> m_dict = new Dictionary<uint, SortedSet<int>> (MaxWindowSize);
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public void Pack (BitmapSource bitmap)
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{
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PrepareInput (bitmap);
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m_dict.Clear();
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m_buffer.Clear();
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m_buffer_size = 0;
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int last = m_input.Length;
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int current = 0;
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int win_begin = current;
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int win_end = current;
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while (current != last)
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{
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int new_win_end = current;
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int window_size = Math.Min (new_win_end - win_begin, MaxWindowSize);
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int new_win_begin = new_win_end - window_size;
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AdjustWindow (ref win_begin, ref win_end, new_win_begin, new_win_end);
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var win_pos = FindLongest (win_begin, win_end, current, last);
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if (win_pos.Length > 0)
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{
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Flush();
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WritePos (win_pos, current - win_pos.Offset);
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current += win_pos.Length;
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}
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else
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{
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WritePixel (m_input[current++]);
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}
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}
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Flush();
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}
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void AdjustWindow (ref int win_begin, ref int win_end, int new_begin, int new_end)
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{
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while (win_begin != new_begin)
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{
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var pixel = m_input[win_begin];
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SortedSet<int> pos = m_dict[pixel];
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pos.Remove (win_begin);
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if (0 == pos.Count)
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m_dict.Remove (pixel);
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++win_begin;
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}
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while (win_end != new_end)
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{
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var pixel = m_input[win_end];
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SortedSet<int> pos;
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if (!m_dict.TryGetValue (pixel, out pos))
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{
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pos = new SortedSet<int>();
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m_dict[pixel] = pos;
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}
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pos.Add (win_end);
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++win_end;
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}
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}
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void WritePixel (uint pixel)
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{
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if (0xff-4 == m_buffer_size)
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Flush();
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m_buffer.Add ((byte)pixel);
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m_buffer.Add ((byte)(pixel >> 8));
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m_buffer.Add ((byte)(pixel >> 16));
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++m_buffer_size;
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}
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void Flush ()
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{
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if (0 != m_buffer.Count)
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{
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m_out.Write ((byte)(m_buffer_size+4));
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foreach (var b in m_buffer)
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m_out.Write (b);
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m_buffer.Clear();
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m_buffer_size = 0;
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}
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}
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int Mismatch (int first1, int last1, int first2)
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{
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while (first1 != last1 && m_input[first1] == m_input[first2])
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{
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++first1;
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++first2;
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}
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return first2;
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}
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WindowPosition FindLongest (int win_begin, int win_end, int buf_begin, int buf_end)
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{
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buf_end = Math.Min (buf_begin + MaxMatchSize, buf_end);
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WindowPosition pos = new WindowPosition { Offset = 0, Length = 0 };
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if (win_begin == win_end)
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return pos;
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SortedSet<int> found;
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if (m_dict.TryGetValue (m_input[buf_begin], out found))
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{
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foreach (var win_pos in found.Reverse())
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{
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var match_end = Mismatch (buf_begin+1, buf_end, win_pos+1);
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int weight = match_end - win_pos;
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int distance = buf_begin - win_pos;
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if (weight > pos.Length)
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{
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pos.Offset = (ushort)distance;
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pos.Length = (ushort)weight;
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if (MaxMatchSize == weight)
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break;
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}
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}
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}
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return pos;
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}
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void WritePos (WindowPosition pos, int buf)
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{
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if (1 == pos.Offset)
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{
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uint pixel = m_input[buf];
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if (1 == pos.Length || -1 == Array.FindIndex (m_input, buf+1, pos.Length-1, x => x != pixel))
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{
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m_out.Write ((byte)0);
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m_out.Write ((byte)pos.Length);
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}
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else
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{
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m_out.Write ((byte)1);
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m_out.Write ((byte)pos.Length);
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m_out.Write ((byte)1);
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}
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}
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else if (1 == pos.Length)
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{
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if (pos.Offset < 0x100)
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{
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m_out.Write ((byte)3);
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m_out.Write ((byte)pos.Offset);
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}
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else
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{
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m_out.Write ((byte)4);
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m_out.Write (pos.Offset);
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}
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}
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else if (pos.Offset < 0x100)
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{
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m_out.Write ((byte)1);
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m_out.Write ((byte)pos.Length);
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m_out.Write ((byte)pos.Offset);
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}
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else
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{
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m_out.Write ((byte)2);
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m_out.Write ((byte)pos.Length);
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m_out.Write (pos.Offset);
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}
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}
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#region IDisposable Members
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bool disposed = false;
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public void Dispose ()
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{
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Dispose (true);
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GC.SuppressFinalize (this);
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}
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protected virtual void Dispose (bool disposing)
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{
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if (!disposed)
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{
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if (disposing)
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{
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m_out.Dispose();
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}
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disposed = true;
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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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}
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