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//! \file ImageMFC.cs
//! \date Mon Jun 06 01:21:54 2016
//! \brief Vitamin image with alpha channel.
//
// 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.ComponentModel.Composition;
using System.IO;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using GameRes.Utility;
namespace GameRes.Formats.Vitamin
{
internal class MfcMetaData : ImageMetaData
{
public int AlphaSize;
public SbiMetaData BaseInfo;
}
[Export(typeof(ImageFormat))]
public class MfcFormat : SbiFormat
{
public override string Tag { get { return "MFC"; } }
public override string Description { get { return "Vitamin image with alpha channel"; } }
public override uint Signature { get { return 0x0A43464D; } } // 'MFC'
public MfcFormat ()
{
Extensions = new string[] { "mfc" };
}
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public override ImageMetaData ReadMetaData (IBinaryStream stream)
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{
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var header = stream.ReadHeader (0x18);
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if (header[4] != 1 || header[5] != 0 || header[6] != 1 || header[7] != 4)
return null;
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int alpha_size = header.ToInt32 (12);
using (var reg = new StreamRegion (stream.AsStream, alpha_size, true))
using (var sbi = new BinaryStream (reg, stream.Name))
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{
var info = base.ReadMetaData (sbi) as SbiMetaData;
if (null == info)
return null;
return new MfcMetaData
{
Width = info.Width,
Height = info.Height,
BPP = 32,
AlphaSize = alpha_size,
BaseInfo = info,
};
}
}
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public override ImageData Read (IBinaryStream stream, ImageMetaData info)
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{
var meta = (MfcMetaData)info;
// XXX implemented like in reference code, width is expected to be even.
var alpha = new byte[info.Width * info.Height / 2];
stream.Position = 0x18;
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RleUnpack (stream.AsStream, meta.AlphaSize - 0x18, alpha);
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byte[] pixels;
using (var reg = new StreamRegion (stream.AsStream, meta.AlphaSize, true))
using (var sbi = new BinaryStream (reg, stream.Name))
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using (var reader = new SbiReader (sbi, meta.BaseInfo))
{
reader.Unpack();
if (meta.BaseInfo.BPP != 32)
{
var bitmap = BitmapSource.Create ((int)info.Width, (int)info.Height, ImageData.DefaultDpiX, ImageData.DefaultDpiY,
reader.Format, reader.Palette, reader.Data, reader.Stride);
bitmap = new FormatConvertedBitmap (bitmap, PixelFormats.Bgra32, null, 0);
int stride = (int)info.Width * 4;
pixels = new byte[stride * (int)info.Height];
bitmap.CopyPixels (pixels, stride, 0);
}
else
pixels = reader.Data;
}
using (var mem = new MemoryStream (alpha))
using (var bits = new LsbBitStream (mem))
{
for (int i = 3; i < pixels.Length; i += 4)
{
pixels[i] = (byte)(bits.GetBits (4) * 0x11);
}
}
return ImageData.Create (info, PixelFormats.Bgra32, null, pixels);
}
public override void Write (Stream file, ImageData image)
{
throw new System.NotImplementedException ("MfcFormat.Write not implemented");
}
void RleUnpack (Stream input, int input_size, byte[] output)
{
int dst = 0;
while (input_size > 0)
{
int b = input.ReadByte();
if (-1 == b)
throw new EndOfStreamException();
--input_size;
if (b >= 0x80)
{
int a = input.ReadByte();
if (-1 == a)
throw new EndOfStreamException();
--input_size;
b &= 0x7F;
for (int i = 0; i < b; ++i)
{
output[dst++] = (byte)a;
}
}
else
{
input.Read (output, dst, b);
input_size -= b;
dst += b;
}
}
}
}
}