private Image <Bgra32> DecodeFormat2(IBinaryStream reader)
{
var textureWidth = _alignedWidth / 4;
var textureHeight = _alignedHeight / 4;
var data = reader.ReadBytesExact(_alignedWidth * _alignedHeight);
var decrypted = new byte[data.Length];
var src = 0;
foreach (var i in Range(textureWidth * textureHeight))
{
var x = GetX(i, textureWidth, 16);
var y = GetY(i, textureWidth, 16);
var dst = (x + y * textureWidth) * 16;
foreach (var _ in Range(8))
{
decrypted[dst + 1] = data[src];
decrypted[dst] = data[src + 1];
dst += 2;
src += 2;
}
}
var pixels = Dxt5Codec.Decode(decrypted, _alignedWidth, _alignedHeight);
var image = Image.LoadPixelData(pixels, _alignedWidth, _alignedHeight);
image.Mutate(x => x.Crop(Width, Height));
return(image);
}
private static byte[] PeekBytes(IBinaryStream reader, long pos, int size)
{
var oldPos = reader.Position;
reader.Position = pos;
var bytes = reader.ReadBytesExact(size);
reader.Position = oldPos;
return(bytes);
}
private Image <Bgr565> DecodeFormat1(IBinaryStream reader)
{
var data = reader.ReadBytesExact(_alignedWidth * _alignedHeight * 2);
var pixels = new Bgr565[Width * Height];
foreach (var i in Range(_alignedWidth * _alignedHeight))
{
var x = GetX(i, _alignedWidth, 2);
var y = GetY(i, _alignedWidth, 2);
if (x >= Width || y >= Height)
{
continue;
}
var src = i * 2;
pixels[x + y * Width].PackedValue = checked ((ushort)(data[src] | (data[src + 1] << 8)));
}
return(Image.LoadPixelData(pixels, Width, Height));
}
private Image <Bgra4444> DecodeFont(IBinaryStream reader)
{
// from https://github.com/vn-tools/arc_unpacker/issues/54
IsFontAtlas = true;
var data = reader.ReadBytesExact(_alignedWidth * _alignedHeight * 2);
var encodedWidth = Width;
Width *= 4;
var encodedHeight = Height;
var pixels = new Bgra4444[Width * Height];
foreach (var i in Range(_alignedWidth * _alignedHeight))
{
var absX = GetX(i, _alignedWidth, 2);
var absY = GetY(i, _alignedWidth, 2);
if (absX >= encodedWidth || absY >= encodedHeight)
{
continue;
}
var src = i * 2;
var blockX = (absX / BlockSize) * BlockSize;
var blockY = (absY / BlockSize) * BlockSize;
var x = absX % BlockSize;
var y = absY % BlockSize;
var targetY = blockY + y;
var targetBase = blockX * 4 + x + targetY * Width;
var target1 = targetBase;
var target2 = targetBase + BlockSize;
var target3 = targetBase + BlockSize * 2;
var target4 = targetBase + BlockSize * 3;
pixels[target1].PackedValue = (ushort)(0x0FFFu | ((data[src] >> 4) << 12));
pixels[target2].PackedValue = (ushort)(0x0FFFu | ((data[src] & 0xF) << 12));
pixels[target3].PackedValue = (ushort)(0x0FFFu | ((data[src + 1] >> 4) << 12));
pixels[target4].PackedValue = (ushort)(0x0FFFu | ((data[src + 1] & 0xF) << 12));
}
return(Image.LoadPixelData(pixels, Width, Height));
}
private static Byte[] ReadUtfPacket(IBinaryStream reader)
{
var unknown = reader.ReadUInt32LE(); // 0x000000FF
if (unknown != 0x00000FFU)
{
Console.WriteLine($"Unknown u32 {unknown} != 0x000000FF");
}
var size = reader.ReadInt64LE();
if (size > int.MaxValue)
{
throw new InvalidDataException($"Too large UTF size {size}");
}
var utf = reader.ReadBytesExact((int)size);
if (!utf.Take(4).SequenceEqual(UtfTag))
{
DecryptInPlace(utf);
}
return(utf);
}
private Image <Bgra32> DecodeFormat0(IBinaryStream reader)
{
var data = reader.ReadBytesExact(_alignedWidth * _alignedHeight * 4);
var pixels = new Bgra32[Width * Height];
foreach (var i in Range(_alignedWidth * _alignedHeight))
{
var x = GetX(i, _alignedWidth, 4);
var y = GetY(i, _alignedWidth, 4);
if (x >= Width || y >= Height)
{
continue;
}
var src = i * 4;
pixels[x + y * Width] = new Bgra32(
b: data[src + 3],
g: data[src + 2],
r: data[src + 1],
a: data[src]
);
}
return(Image.LoadPixelData(pixels, Width, Height));
}
protected override void ReadArgs(IBinaryStream reader)
{
Args = reader.ReadBytesExact(Args.Length);
}