public TgvFile ReadDDS(byte[] input)
{
int contentSize = input.Length - Marshal.SizeOf(typeof(DDS.DDS.Header)) - Marshal.SizeOf((typeof(uint)));
var file = new TgvFile();
using (var ms = new MemoryStream(input))
{
var buffer = new byte[4];
ms.Read(buffer, 0, buffer.Length);
if (BitConverter.ToUInt32(buffer, 0) != DDS.DDS.MagicHeader)
throw new ArgumentException("Wrong DDS magic");
buffer = new byte[Marshal.SizeOf(typeof(DDS.DDS.Header))];
ms.Read(buffer, 0, buffer.Length);
var header = Utils.ByteArrayToStructure<DDS.DDS.Header>(buffer);
int mipSize = contentSize;
if (header.MipMapCount == 0)
header.MipMapCount = 1;
else
mipSize -= contentSize / header.MipMapCount;
for (ushort i = 0; i < header.MipMapCount; i++)
{
buffer = new byte[mipSize];
ms.Read(buffer, 0, buffer.Length);
var mip = new TgvMipMap { Content = buffer };
file.MipMaps.Add(mip);
mipSize /= 4;
}
file.Height = header.Height;
file.ImageHeight = header.Height;
file.Width = header.Width;
file.ImageWidth = header.Width;
file.MipMapCount = (ushort)header.MipMapCount;
DDSHelper.ConversionFlags conversionFlags;
file.Format = DDSHelper.GetDXGIFormat(ref header.PixelFormat, out conversionFlags);
}
return file;
}
/// <summary>
/// This method is stream and order dependant, don't use outside.
/// </summary>
/// <param name="ms"></param>
/// <param name="file"></param>
/// <param name="id"></param>
/// <returns></returns>
private TgvMipMap ReadMip(Stream ms, TgvFile file, int id)
{
if (id > file.MipMapCount)
throw new ArgumentException("id");
var zipo = new byte[] { 0x5A, 0x49, 0x50, 0x4F };
var mipMap = new TgvMipMap(file.Offsets[id], file.Sizes[id], 0);
byte[] buffer;
if (file.IsCompressed)
{
buffer = new byte[4];
ms.Read(buffer, 0, buffer.Length);
if (!Utils.ByteArrayCompare(buffer, zipo))
throw new InvalidDataException("Mipmap has to start with \"ZIPO\"!");
ms.Read(buffer, 0, buffer.Length);
mipMap.MipWidth = BitConverter.ToInt32(buffer, 0);
buffer = new byte[mipMap.Size - 8];
}
else
buffer = new byte[mipMap.Size];
ms.Read(buffer, 0, buffer.Length);
ms.Seek(Utils.RoundToNextDivBy4((int)mipMap.Size)-mipMap.Size, SeekOrigin.Current);
if (file.IsCompressed)
buffer = Compressor.Decomp(buffer);
mipMap.Content = buffer;
return mipMap;
}
