/// <summary>
/// Parses the data from a DDS byte array. (Can also read just the header only)
/// </summary>
/// <param name="fileData"></param>
/// <param name="headerOnly"></param>
private void GetData(byte[] fileData, bool headerOnly)
{
ConsoleFunctions.SetConsoleColor(ConsoleColor.Black, ConsoleColor.White);
Console.WriteLine("Total Source Texture Byte Size = {0}", fileData.Length);
//which byte offset we are on for the source texture (will be changed as we go through the file)
byte[] headerBytes = ByteFunctions.AllocateBytes(124, fileData, 4); //skip past the 'DDS '
//this will automatically read all of the byte data in the header
header = DDS_Functions.GetHeaderFromBytes(headerBytes);
ConsoleFunctions.SetConsoleColor(ConsoleColor.Black, ConsoleColor.White);
Console.WriteLine("DDS Height = {0}", header.dwHeight);
Console.WriteLine("DDS Width = {0}", header.dwWidth);
Console.WriteLine("DDS Mip Map Count = {0}", header.dwMipMapCount);
Console.WriteLine("DDS Compression = {0}", header.ddspf.dwFourCC);
if (headerOnly)
{
return;
}
//--------------------------EXTRACT DDS TEXTURE DATA--------------------------
//calculate dds header length (we add 4 because we skipped the 4 bytes which contain the ddsPrefix, it isn't necessary to parse this data)
uint ddsHeaderLength = 4 + header.dwSize;
//calculate the length of just the dds texture data
uint ddsTextureDataLength = (uint)sourceFileData.Length - ddsHeaderLength;
//allocate a byte array of dds texture length
byte[] ddsTextureData = new byte[ddsTextureDataLength];
//copy the data from the source byte array past the header (so we are only getting texture data)
Array.Copy(sourceFileData, ddsHeaderLength, ddsTextureData, 0, ddsTextureData.Length);
//if there are no mip maps
if (header.dwMipMapCount <= 1)
{
textureData = new();
textureData.Add(ddsTextureData);
Console.WriteLine("DDS Texture Byte Size = {0}", textureData[0].Length);
}
else //if there are mip maps
{
//get mip resolutions
//calculated mip resolutions [Pixel Value, Width or Height (0 or 1)]
mipMapResolutions = DDS_Functions.DDS_CalculateMipResolutions(header.dwMipMapCount, header.dwWidth, header.dwHeight);
//get byte sizes
uint[] byteSizes = DDS_Functions.DDS_GetImageByteSizes(mipMapResolutions, DDS_Functions.DDS_CompressionBool(header));
textureData = new();
int test = ddsTextureData.Length;
int offset = 0;
for (int i = 0; i < byteSizes.Length; i++)
{
byte[] temp = new byte[byteSizes[i]];
//issue length
Array.Copy(ddsTextureData, offset, temp, 0, temp.Length);
offset += temp.Length - 1;
textureData.Add(temp);
test -= (int)byteSizes[i];
}
}
}
