GARbro-mirror/ArcFormats/EmonEngine/ImageBMP.cs
2016-03-16 04:20:52 +04:00

135 lines
5.2 KiB
C#

//! \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" };
}
public override ImageMetaData ReadMetaData (Stream stream)
{
using (var reader = new ArcView.Reader (stream))
{
reader.ReadInt32();
var info = new EmMetaData();
info.LzssFrameSize = reader.ReadUInt16();
info.LzssInitPos = reader.ReadUInt16();
info.BPP = reader.ReadUInt16() & 0xFF;
info.Width = reader.ReadUInt16();
info.Height = reader.ReadUInt16();
info.Colors = reader.ReadUInt16();
info.Stride = reader.ReadInt32();
info.OffsetX = reader.ReadInt32();
info.OffsetY = reader.ReadInt32();
info.DataOffset = 40;
return info;
}
}
public override ImageData Read (Stream stream, ImageMetaData info)
{
var meta = (EmMetaData)info;
stream.Position = meta.DataOffset;
BitmapPalette palette = null;
if (meta.Colors != 0)
palette = ReadPalette (stream, Math.Max (meta.Colors, 3));
var pixels = new byte[meta.Stride * (int)info.Height];
if (meta.LzssFrameSize != 0)
{
using (var lzss = new LzssStream (stream, LzssMode.Decompress, true))
{
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);
}
BitmapPalette ReadPalette (Stream input, int colors)
{
int palette_size = colors * 4;
var palette_data = new byte[palette_size];
if (palette_size != input.Read (palette_data, 0, palette_size))
throw new InvalidFormatException();
var palette = new Color[colors];
int src = 0;
for (int i = 0; i < palette.Length; ++i)
{
palette[i] = Color.FromRgb (palette_data[src], palette_data[src+1], palette_data[src+2]);
src += 4;
}
return new BitmapPalette (palette);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("EmFormat.Write not implemented");
}
}
}