public override ImageData Read(IBinaryStream stream, ImageMetaData info)
{
var meta = (MgrMetaData)info;
stream.Position = meta.Offset;
var data = new byte[meta.UnpackedSize];
if (data.Length != MgrOpener.Decompress(stream.AsStream, data))
{
throw new InvalidFormatException();
}
if (meta.BPP != 32)
{
using (var bmp = new BinMemoryStream(data, stream.Name))
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 ImageMetaData ReadMetaData(IBinaryStream stream)
{
int count = stream.ReadInt16();
if (count <= 0 || count >= 0x100)
{
return(null);
}
int offset;
if (count > 1)
{
offset = stream.ReadInt32();
if (offset != 2 + count * 4)
{
return(null);
}
}
else
{
offset = 2;
}
stream.Position = offset;
int unpacked_size = stream.ReadInt32();
int packed_size = stream.ReadInt32();
offset += 8;
if (offset + packed_size > stream.Length)
{
return(null);
}
byte[] header = new byte[0x36];
if (0x36 != MgrOpener.Decompress(stream.AsStream, header) ||
header[0] != 'B' || header[1] != 'M')
{
return(null);
}
using (var bmp = new BinMemoryStream(header, stream.Name))
{
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,
});
}
}