protected override void OnOpen(EndianBinaryReader reader)
{
reader.Endianness = Endian.BigEndian;
MagicNumber = Encoding.ASCII.GetString(reader.ReadBytes(4));
Version = Encoding.ASCII.GetString(reader.ReadBytes(4));
FileSize = reader.ReadUInt32();
HeaderSize = reader.ReadUInt32();
NumImages = reader.ReadUInt32();
Unknown0x14 = reader.ReadUInt32();
Unknown0x18 = reader.ReadUInt32();
UnknownValues0x1C = new uint[NumImages];
for (int i = 0; i < UnknownValues0x1C.Length; i++)
{
UnknownValues0x1C[i] = reader.ReadUInt32();
}
ImageOffsets = new uint[NumImages];
for (int i = 0; i < ImageOffsets.Length; i++)
{
ImageOffsets[i] = reader.ReadUInt32();
}
imageDataShims = new G1TGImageDataShim[NumImages];
for (int i = 0; i < NumImages; i++)
{
reader.BaseStream.Seek(HeaderSize + ImageOffsets[i], SeekOrigin.Begin);
G1TGImageHeader imageHeader = new G1TGImageHeader(reader);
reader.BaseStream.Seek((HeaderSize + ImageOffsets[i]) + imageHeader.HeaderSize, SeekOrigin.Begin);
imageDataShims[i] = new G1TGImageDataShim(imageHeader, reader);
}
}
public G1TGImageDataShim(G1TGImageHeader header, EndianBinaryReader reader)
{
/* Determine Scarlet pixel format */
byte pixelFormat = header.PixelFormat;
switch (pixelFormat)
{
case 0x01: Format = PixelDataFormat.FormatRgba8888; break;
case 0x06: Format = PixelDataFormat.FormatDXT1Rgba; break;
case 0x08: Format = PixelDataFormat.FormatDXT5; break;
default: throw new Exception($"Unhandled G1TG image format 0x{pixelFormat:X}");
}
/* Extract packed dimensions */
byte packedDimensions = header.PackedDimensions;
Width = (1 << ((packedDimensions >> 4) & 0x0F));
Height = (1 << (packedDimensions & 0x0F));
/* Read image data */
Data = reader.ReadBytes((int)((Width * Height) * (Constants.RealBitsPerPixel[Format & PixelDataFormat.MaskBpp] / 8.0)));
}
