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144 lines
5.0 KiB
C#

//! \file ImageBGI.cs
//! \date Fri Apr 03 01:39:41 2015
//! \brief BGI/Ethornell engine image format.
//
// 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 System.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
namespace GameRes.Formats.BGI
{
internal class BgiMetaData : ImageMetaData
{
public bool IsScrambled;
}
[Export(typeof(ImageFormat))]
public class BgiFormat : ImageFormat
{
public override string Tag { get { return "BGI"; } }
public override string Description { get { return "BGI/Ethornell image format"; } }
public override uint Signature { get { return 0; } }
public BgiFormat ()
{
Extensions = new string[] { "", "bgi", "_bg", "bg" };
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("BgiFormat.Write not implemented");
}
public override ImageMetaData ReadMetaData (IBinaryStream stream)
{
int width = stream.ReadInt16();
int height = stream.ReadInt16();
if (width <= 0 || height <= 0)
return null;
int bpp = stream.ReadInt16();
if (24 != bpp && 32 != bpp && 8 != bpp)
return null;
int flag = stream.ReadInt16();
if (flag != 1 && flag != 0)
return null;
if (0 != stream.ReadInt64())
return null;
if (flag == 0)
{
int stride = (int)width * ((bpp + 7) / 8);
var pixels = new byte[stride * (int)height];
int read = stream.Read(pixels, 0, pixels.Length);
if (read != pixels.Length)
return null;
}
return new BgiMetaData
{
Width = (uint)width,
Height = (uint)height,
BPP = bpp,
IsScrambled = flag != 0,
};
}
public override ImageData Read (IBinaryStream stream, ImageMetaData info)
{
var meta = (BgiMetaData)info;
PixelFormat format;
if (24 == info.BPP)
format = PixelFormats.Bgr24;
else if (32 == info.BPP)
format = PixelFormats.Bgra32;
else
format = PixelFormats.Gray8;
int stride = (int)info.Width * ((info.BPP+7)/8);
var pixels = new byte[stride * (int)info.Height];
stream.Position = 0x10;
if (!meta.IsScrambled)
{
int read = stream.Read (pixels, 0, pixels.Length);
if (read != pixels.Length)
throw new InvalidFormatException();
}
else
{
RestorePixels (stream, pixels, meta);
}
return ImageData.Create (info, format, null, pixels, stride);
}
void RestorePixels (IBinaryStream input, byte[] output, BgiMetaData info)
{
int bpp = info.BPP / 8;
int stride = (int)info.Width * bpp;
for (int i = 0; i < bpp; ++i)
{
int dst = i;
byte incr = 0;
for (int h = (int)info.Height; h > 0; --h)
{
for (uint w = 0; w < info.Width; ++w)
{
incr += input.ReadUInt8();
output[dst] = incr;
dst += bpp;
}
if (--h == 0)
break;
dst += stride;
int pos = dst;
for (uint w = 0; w < info.Width; ++w)
{
pos -= bpp;
incr += input.ReadUInt8();
output[pos] = incr;
}
}
}
}
}
}