public ITexImage ReadFrom(
BinaryReader reader,
ITexImageContainer container,
TexFormat texFormat)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
if (container == null)
{
throw new ArgumentNullException(nameof(container));
}
if (!texFormat.IsValid())
{
throw new EnumNotValidException <TexFormat>(texFormat);
}
var mipmapCount = reader.ReadInt32();
if (mipmapCount > Constants.MaximumMipmapCount)
{
throw new UnsafeTexException(
$"Mipmap count exceeds limit: {mipmapCount}/{Constants.MaximumMipmapCount}");
}
var readFunction = PickMipmapReader(container.ImageContainerVersion);
var format = TexMipmapFormatGetter.GetFormatForTex(container.ImageFormat, texFormat);
var image = new TexImage();
for (var i = 0; i < mipmapCount; i++)
{
var mipmap = readFunction(reader);
mipmap.Format = format;
if (DecompressMipmapBytes)
{
_texMipmapDecompressor.DecompressMipmap(mipmap);
}
image.Mipmaps.Add(mipmap);
}
return(image);
}
protected void ReadBytes(BinaryReader reader, TexMipmap mipmap)
{
if (!ReadMipmapBytes)
{
reader.BaseStream.Seek(mipmap.BytesCount, SeekOrigin.Current);
return;
}
mipmap.Bytes = new byte[mipmap.BytesCount];
var bytesRead = reader.Read(mipmap.Bytes, 0, mipmap.BytesCount);
if (bytesRead != mipmap.BytesCount)
{
throw new Exception("Failed to read bytes from stream while reading mipmap");
}
if (DecompressMipmapBytes)
{
_texMipmapDecompressor.DecompressMipmap(mipmap);
}
}