// Main logic taken from Tinke "Ekona/Images/Actions.cs Get_Size"
private Size GetImageSize(NitroCharHeader header)
{
if (header.tileCountX > 0)
{
return(new Size(header.tileCountX * 8, header.tileCountY * 8));
}
var pixelCount = header.tileDataSize * 8 / GetBitDepth(header.imageFormat);
// If image is squared
var sqrt = (int)Math.Sqrt(pixelCount);
if ((int)Math.Pow(sqrt, 2) == pixelCount)
{
return(new Size(sqrt, sqrt));
}
// Otherwise derive it from data size
var width = Math.Min(pixelCount, 0x100);
width = width == 0 ? 1 : width;
var height = pixelCount / width;
height = height == 0 ? 1 : height;
return(new Size(width, height));
}
public ImageInfo Load(Stream ncgrStream, Stream nclrStream)
{
using var ncgrBr = new BinaryReaderX(ncgrStream);
using var nclrBr = new BinaryReaderX(nclrStream);
// Read generic headers
_ncgrHeader = ncgrBr.ReadType <NitroHeader>();
_nclrHeader = nclrBr.ReadType <NitroHeader>();
// Read Char header
_charHeader = ncgrBr.ReadType <NitroCharHeader>();
// Read Ttlp header
_ttlpHeader = nclrBr.ReadType <NitroTtlpHeader>();
// Read palette data
byte[] paletteData;
if (GetBitDepth(_charHeader.imageFormat) == 4)
{
nclrBr.BaseStream.Position += 0xE * 0x20;
paletteData = nclrBr.ReadBytes(0x20);
// Backup complete palette data
nclrBr.BaseStream.Position -= 0xF * 20;
_palette = nclrBr.ReadBytes(_ttlpHeader.paletteSize);
}
else
{
paletteData = nclrBr.ReadBytes(_ttlpHeader.paletteSize);
}
// Create image
var dataLength = _charHeader.tileCountX < 0 ? _charHeader.tileDataSize : _charHeader.tileCountX * _charHeader.tileCountY;
var data = ncgrBr.ReadBytes(dataLength);
var size = GetImageSize(_charHeader);
var imageInfo = new ImageInfo(data, _charHeader.imageFormat, size)
{
ImageFormat = _charHeader.imageFormat,
PaletteData = paletteData,
PaletteFormat = 0,
Configuration = new ImageConfiguration()
.RemapPixelsWith(imageSize => new NitroSwizzle(imageSize.Width, imageSize.Height))
};
return(imageInfo);
}
