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309 lines
11 KiB
C#
309 lines
11 KiB
C#
//! \file ImageIAF.cs
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//! \date Sun May 31 21:17:54 2015
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//! \brief IAF image format.
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//
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// Copyright (C) 2015 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 GameRes.Utility;
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namespace GameRes.Formats.Triangle
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{
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internal class IafMetaData : ImageMetaData
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{
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public int DataOffset;
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public int PackedSize;
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public int UnpackedSize;
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public int PackType;
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}
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[Export(typeof(ImageFormat))]
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public class IafFormat : BmpFormat
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{
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public override string Tag { get { return "IAF"; } }
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public override string Description { get { return "Triangle compressed bitmap format"; } }
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public override uint Signature { get { return 0; } }
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public override ImageMetaData ReadMetaData (Stream stream)
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{
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var header = new byte[0x14];
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if (12 != stream.Read (header, 0, 12))
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return null;
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int data_offset;
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int packed_size = LittleEndian.ToInt32 (header, 1);
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int x, y, unpacked_size;
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if (5+packed_size+0x14 == stream.Length)
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{
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data_offset = 5;
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stream.Seek (-0x14, SeekOrigin.End);
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if (0x14 != stream.Read (header, 0, 0x14))
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return null;
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x = LittleEndian.ToInt32 (header, 0);
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y = LittleEndian.ToInt32 (header, 4);
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unpacked_size = LittleEndian.ToInt32 (header, 0x10);
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}
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else
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{
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data_offset = 12;
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x = LittleEndian.ToInt32 (header, 0);
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y = LittleEndian.ToInt32 (header, 4);
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unpacked_size = LittleEndian.ToInt32 (header, 8);
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packed_size = (int)stream.Length-12;
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}
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if (Math.Abs (x) > 4096 || Math.Abs (y) > 4096)
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return null;
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int pack_type = (unpacked_size >> 30) & 3;
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unpacked_size &= (int)~0xC0000000;
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stream.Position = data_offset;
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byte[] bmp;
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if (0 == pack_type)
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{
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using (var reader = new LzssReader (stream, (int)stream.Length-12, 0x26))
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{
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reader.Unpack();
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bmp = reader.Data;
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}
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}
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else if (2 == pack_type)
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{
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using (var reader = new RleReader (stream, (int)stream.Length-12, 0x26))
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{
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reader.Unpack();
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bmp = reader.Data;
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}
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}
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else if (1 == pack_type)
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{
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bmp = new byte[0x26];
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stream.Read (bmp, 0, bmp.Length);
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}
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else
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{
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return null;
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}
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if (bmp[0] != 'B' && bmp[0] != 'C' || bmp[1] != 'M')
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return null;
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int width = LittleEndian.ToInt32 (bmp, 0x12);
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int height = LittleEndian.ToInt32 (bmp, 0x16);
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int bpp = LittleEndian.ToInt16 (bmp, 0x1c);
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return new IafMetaData
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{
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Width = (uint)width,
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Height = (uint)height,
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OffsetX = x,
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OffsetY = y,
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BPP = bpp,
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DataOffset = data_offset,
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PackedSize = packed_size,
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UnpackedSize = unpacked_size,
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PackType = pack_type,
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};
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}
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public override ImageData Read (Stream stream, ImageMetaData info)
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{
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var meta = info as IafMetaData;
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if (null == meta)
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throw new ArgumentException ("IafFormat.Read should be supplied with IafMetaData", "info");
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stream.Position = meta.DataOffset;
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byte[] bitmap;
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if (2 == meta.PackType)
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{
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using (var reader = new RleReader (stream, meta.PackedSize, meta.UnpackedSize))
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{
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reader.Unpack();
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bitmap = reader.Data;
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}
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}
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else if (0 == meta.PackType)
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{
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using (var reader = new LzssReader (stream, meta.PackedSize, meta.UnpackedSize))
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{
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reader.Unpack();
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bitmap = reader.Data;
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}
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}
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else
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{
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bitmap = new byte[meta.UnpackedSize];
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if (bitmap.Length != stream.Read (bitmap, 0, bitmap.Length))
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throw new InvalidFormatException ("Unexpected end of file");
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}
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if ('C' == bitmap[0])
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{
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bitmap[0] = (byte)'B';
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if (info.BPP > 8)
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bitmap = ConvertCM (bitmap, (int)info.Width, (int)info.Height, info.BPP);
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}
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if (meta.BPP >= 24) // currently alpha channel could be applied to 24+bpp bitmaps only
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{
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try
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{
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int bmp_size = LittleEndian.ToInt32 (bitmap, 2);
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if (bitmap.Length - bmp_size > 0x36) // size of bmp header
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{
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if ('B' == bitmap[bmp_size] && 'M' == bitmap[bmp_size+1] &&
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8 == bitmap[bmp_size+0x1c]) // 8bpp
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{
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uint alpha_width = LittleEndian.ToUInt32 (bitmap, bmp_size+0x12);
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uint alpha_height = LittleEndian.ToUInt32 (bitmap, bmp_size+0x16);
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if (info.Width == alpha_width && info.Height == alpha_height)
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return BitmapWithAlphaChannel (meta, bitmap, bmp_size);
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}
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}
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}
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catch
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{
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// ignore any errors occured during alpha-channel read attempt,
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// fallback to a plain bitmap
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}
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}
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using (var bmp = new MemoryStream (bitmap))
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return base.Read (bmp, info);
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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 ("IafFormat.Write not implemented");
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}
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static ImageData BitmapWithAlphaChannel (ImageMetaData info, byte[] bitmap, int alpha_offset)
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{
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int src_pixel_size = info.BPP/8;
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int src_stride = (int)info.Width*src_pixel_size;
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int src_pixels = LittleEndian.ToInt32 (bitmap, 0x0A);
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int src_alpha = alpha_offset + LittleEndian.ToInt32 (bitmap, alpha_offset+0x0A);
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var pixels = new byte[info.Width * info.Height * 4];
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int dst = 0;
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for (int y = (int)info.Height-1; y >= 0; --y)
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{
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int src = src_pixels + y*src_stride;
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int alpha = src_alpha + y*(int)info.Width;
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for (uint x = 0; x < info.Width; ++x)
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{
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pixels[dst++] = bitmap[src];
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pixels[dst++] = bitmap[src+1];
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pixels[dst++] = bitmap[src+2];
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pixels[dst++] = (byte)~bitmap[alpha++];
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src += src_pixel_size;
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}
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}
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return ImageData.Create (info, PixelFormats.Bgra32, null, pixels);
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}
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static byte[] ConvertCM (byte[] input, int width, int height, int bpp)
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{
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int src = LittleEndian.ToInt32 (input, 0x0a);
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int pixel_size = bpp / 8;
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var bitmap = new byte[input.Length];
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Buffer.BlockCopy (input, 0, bitmap, 0, src);
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int stride = width * pixel_size;
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int i = src;
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for (int p = 0; p < pixel_size; ++p)
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{
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for (int y = 0; y < height; ++y)
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{
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int pixel = y * stride + p;
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for (int x = 0; x < width; ++x)
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{
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bitmap[src+pixel] = input[i++];
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pixel += pixel_size;
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}
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}
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}
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return bitmap;
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}
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}
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internal class RleReader : IDataUnpacker, IDisposable
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{
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BinaryReader m_input;
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byte[] m_output;
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int m_size;
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public byte[] Data { get { return m_output; } }
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public RleReader (Stream input, int input_length, int output_length)
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{
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m_input = new ArcView.Reader (input);
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m_output = new byte[output_length];
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m_size = input_length;
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}
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public void Unpack ()
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{
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int src = 0;
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int dst = 0;
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while (dst < m_output.Length && src < m_size)
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{
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byte ctl = m_input.ReadByte();
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++src;
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if (0 == ctl)
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{
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int count = m_input.ReadByte();
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++src;
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count = Math.Min (count, m_output.Length - dst);
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int read = m_input.Read (m_output, dst, count);
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dst += count;
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src += count;
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}
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else
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{
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int count = ctl;
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byte b = m_input.ReadByte();
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++src;
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count = Math.Min (count, m_output.Length - dst);
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for (int i = 0; i < count; i++)
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m_output[dst++] = b;
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}
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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_input.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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