/// <summary>
/// Decompress DXTC
/// </summary>
/// <param name="reader"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="inputFormat"></param>
/// <param name="readLength"></param>
/// <param name="bUseVitaSwizzled"></param>
/// <returns></returns>
public static byte[] Decompress(EndianBinaryReader reader, int width, int height, PixelDataFormat inputFormat, long readLength, bool bUseVitaSwizzled = false)
{
byte[] outPixels = new byte[readLength * 8];
DXTxBlockDecoderDelegate blockDecoder;
DXTxBlockLayout blockLayout;
PixelDataFormat specialFormat = (inputFormat & PixelDataFormat.MaskSpecial);
switch (specialFormat)
{
case PixelDataFormat.SpecialFormatDXT1: blockDecoder = DecodeDXT1Block; blockLayout = DXTxBlockLayout.Normal; break;
case PixelDataFormat.SpecialFormatDXT3: blockDecoder = DecodeDXT3Block; blockLayout = DXTxBlockLayout.Normal; break;
case PixelDataFormat.SpecialFormatDXT5: blockDecoder = DecodeDXT5Block; blockLayout = DXTxBlockLayout.Normal; break;
case PixelDataFormat.SpecialFormatDXT1_PSP: blockDecoder = DecodeDXT1Block; blockLayout = DXTxBlockLayout.PSP; break;
case PixelDataFormat.SpecialFormatDXT3_PSP: blockDecoder = DecodeDXT3Block; blockLayout = DXTxBlockLayout.PSP; break;
case PixelDataFormat.SpecialFormatDXT5_PSP: blockDecoder = DecodeDXT5Block; blockLayout = DXTxBlockLayout.PSP; break;
default:
throw new Exception("Trying to decode DXT with format set to non-DXT");
}
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
byte[] decompressedBlock = blockDecoder(reader, inputFormat, blockLayout);
int rx, ry;
if (bUseVitaSwizzled)
{
TextureTool.GetVitaSwizzledTransform(x / 4, y / 4, width / 4, height / 4, out rx, out ry);
}
else
{
rx = x / 4; ry = y / 4;
}
rx *= 4; ry *= 4;
for (int py = 0; py < 4; py++)
{
for (int px = 0; px < 4; px++)
{
int ix = (rx + px);
int iy = (ry + py);
if (ix >= width || iy >= height)
{
continue;
}
for (int c = 0; c < 4; c++)
{
outPixels[(((iy * width) + ix) * 4) + c] = decompressedBlock[(((py * 4) + px) * 4) + c];
}
}
}
}
}
return(outPixels);
}