private void WriteHeader(DDSFileHeader header)
{
var headerSize = Marshal.SizeOf(typeof(DDSFileHeader));
var headerBuffer = new byte[headerSize];
// Write the header data directly from the DDS file header structure
GCHandle handle = GCHandle.Alloc(headerBuffer, GCHandleType.Pinned);
Marshal.StructureToPtr(header, handle.AddrOfPinnedObject(), true);
_binaryWriter.Write(headerBuffer);
handle.Free();
}
/// <summary>
/// Creates a DDS file header data structure with a single RGB surface.
/// </summary>
/// <param name="pixelWidth">The width of the DDS image described by this header.</param>
/// <param name="pixelHeight">The height of the DDS image described by this header.</param>
/// <param name="fourCC">The four-character code which specifies the BCn compression format.</param>
public static DDSFileHeader CreateHeader(int pixelWidth, int pixelHeight, uint fourCC)
{
if (pixelHeight < 0 || pixelWidth < 0)
{
throw new ArgumentException("Received negative image dimension.");
}
var pixelFormat = new DDSPixelFormat();
pixelFormat.Size = 32;
pixelFormat.Flags = DDSPixelFormatFlags.DDPF_FOURCC;
pixelFormat.FourCC = fourCC;
var header = new DDSFileHeader();
header.Size = 124;
header.Flags = MinimumRequiredFlags();
header.Height = (uint)pixelHeight;
header.Width = (uint)pixelWidth;
header.PixelFormat = pixelFormat;
header.Caps = DDSCapsFlags.DDSCAPS_TEXTURE;
return(header);
}
