GARbro-mirror/ArcFormats/EmonEngine/ImageBMP.cs

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//! \file ImageBMP.cs
//! \date Wed Mar 16 01:08:47 2016
//! \brief Emon Engine compressed images.
//
// Copyright (C) 2016 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 System;
using System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using GameRes.Compression;
namespace GameRes.Formats.EmonEngine
{
internal class EmMetaData : ImageMetaData
{
public int Colors;
public int Stride;
public int LzssFrameSize;
public int LzssInitPos;
public int DataOffset;
}
[Export(typeof(ImageFormat))]
public class EmFormat : ImageFormat
{
public override string Tag { get { return "EM/BMP"; } }
public override string Description { get { return "Emon Engine image format"; } }
// this is an artificial prefix embedded into stream by EmeOpener.OpenImage
public override uint Signature { get { return 0x4D424D45; } } // 'EMBM'
public EmFormat ()
{
Extensions = new string[] { "bmp" };
}
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public override ImageMetaData ReadMetaData (IBinaryStream stream)
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{
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stream.ReadInt32();
var info = new EmMetaData();
info.LzssFrameSize = stream.ReadUInt16();
info.LzssInitPos = stream.ReadUInt16();
info.BPP = stream.ReadUInt16() & 0xFF;
info.Width = stream.ReadUInt16();
info.Height = stream.ReadUInt16();
info.Colors = stream.ReadUInt16();
info.Stride = stream.ReadInt32();
info.OffsetX = stream.ReadInt32();
info.OffsetY = stream.ReadInt32();
info.DataOffset = 40;
return info;
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}
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public override ImageData Read (IBinaryStream stream, ImageMetaData info)
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{
var meta = (EmMetaData)info;
stream.Position = meta.DataOffset;
BitmapPalette palette = null;
if (meta.Colors != 0)
palette = ReadPalette (stream.AsStream, Math.Max (meta.Colors, 3), PaletteFormat.RgbX);
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var pixels = new byte[meta.Stride * (int)info.Height];
if (meta.LzssFrameSize != 0)
{
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using (var lzss = new LzssStream (stream.AsStream, LzssMode.Decompress, true))
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{
lzss.Config.FrameSize = meta.LzssFrameSize;
lzss.Config.FrameInitPos = meta.LzssInitPos;
if (pixels.Length != lzss.Read (pixels, 0, pixels.Length))
throw new EndOfStreamException();
}
}
else
{
if (pixels.Length != stream.Read (pixels, 0, pixels.Length))
throw new EndOfStreamException();
}
if (7 == meta.BPP)
return ImageData.Create (info, PixelFormats.Gray8, palette, pixels, meta.Stride);
PixelFormat format;
if (32 == meta.BPP)
format = PixelFormats.Bgr32;
else if (24 == meta.BPP)
format = PixelFormats.Bgr24;
else
format = PixelFormats.Indexed8;
return ImageData.CreateFlipped (info, format, palette, pixels, meta.Stride);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("EmFormat.Write not implemented");
}
}
}