GARbro-mirror/ArcFormats/Propeller/ImageMGR.cs

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//! \file ImageMGR.cs
//! \date Sat Nov 21 01:58:44 2015
//! \brief Propeller compressed bitmap.
//
// Copyright (C) 2015 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using GameRes.Utility;
using System;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
namespace GameRes.Formats.Propeller
{
internal class MgrMetaData : ImageMetaData
{
public int Offset;
public int PackedSize;
public int UnpackedSize;
}
[Export(typeof(ImageFormat))]
public class MgrFormat : ImageFormat
{
public override string Tag { get { return "MGR"; } }
public override string Description { get { return "Propeller image format"; } }
public override uint Signature { get { return 0; } }
public override ImageMetaData ReadMetaData (Stream stream)
{
using (var reader = new ArcView.Reader (stream))
{
int count = reader.ReadInt16();
if (count <= 0 || count >= 0x100)
return null;
int offset;
if (count > 1)
{
offset = reader.ReadInt32();
if (offset != 2 + count * 4)
return null;
}
else
offset = 2;
stream.Position = offset;
int unpacked_size = reader.ReadInt32();
int packed_size = reader.ReadInt32();
offset += 8;
if (offset + packed_size > stream.Length)
return null;
byte[] header = new byte[0x36];
if (0x36 != MgrOpener.Decompress (stream, header)
|| header[0] != 'B' || header[1] != 'M')
return null;
using (var bmp = new MemoryStream (header))
{
var info = Bmp.ReadMetaData (bmp);
if (null == info)
return null;
return new MgrMetaData
{
Width = info.Width,
Height = info.Height,
BPP = info.BPP,
Offset = offset,
PackedSize = packed_size,
UnpackedSize = unpacked_size,
};
}
}
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
var meta = (MgrMetaData)info;
stream.Position = meta.Offset;
var data = new byte[meta.UnpackedSize];
if (data.Length != MgrOpener.Decompress (stream, data))
throw new InvalidFormatException();
if (meta.BPP != 32)
{
using (var bmp = new MemoryStream (data))
return Bmp.Read (bmp, info);
}
// special case for 32bpp bitmaps with alpha-channel
int stride = (int)meta.Width * 4;
var pixels = new byte[stride * (int)meta.Height];
int src = LittleEndian.ToInt32 (data, 0xA);
for (int dst = stride*((int)meta.Height-1); dst >= 0; dst -= stride)
{
Buffer.BlockCopy (data, src, pixels, dst, stride);
src += stride;
}
return ImageData.Create (info, PixelFormats.Bgra32, null, pixels);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("MgrFormat.Write not implemented");
}
}
}