private static DdsHeader CreateDdsHeader(BitmapTextureResourceDefinition definition)
{
var info = definition.Texture.Definition;
var result = new DdsHeader
{
Width = (uint)info.Width,
Height = (uint)info.Height,
MipMapCount = (uint)info.Levels
};
BitmapDdsFormatDetection.SetUpHeaderForFormat(info.Format, result);
switch (info.Type)
{
case BitmapType.CubeMap:
result.SurfaceComplexityFlags = DdsSurfaceComplexityFlags.Complex;
result.SurfaceInfoFlags = DdsSurfaceInfoFlags.CubeMap | DdsSurfaceInfoFlags.CubeMapNegativeX |
DdsSurfaceInfoFlags.CubeMapNegativeY | DdsSurfaceInfoFlags.CubeMapNegativeZ |
DdsSurfaceInfoFlags.CubeMapPositiveX | DdsSurfaceInfoFlags.CubeMapPositiveY |
DdsSurfaceInfoFlags.CubeMapPositiveZ;
break;
case BitmapType.Texture3D:
result.Depth = (uint)info.Depth;
result.SurfaceInfoFlags = DdsSurfaceInfoFlags.Volume;
break;
}
const string dew = "Doritos(TM) Dew(TM) it right!";
Encoding.ASCII.GetBytes(dew, 0, dew.Length, result.Reserved, 0);
return result;
}
public static BitmapType DetectType(DdsHeader dds)
{
if ((dds.SurfaceInfoFlags & DdsSurfaceInfoFlags.CubeMap) != 0)
return BitmapType.CubeMap;
if ((dds.SurfaceInfoFlags & DdsSurfaceInfoFlags.Volume) != 0)
return BitmapType.Texture3D;
return BitmapType.Texture2D;
}
public static void SetUpHeaderForFormat(BitmapFormat format, DdsHeader header)
{
BitmapFormatDefinition definition;
if (!ExtractionDefinitions.TryGetValue(format, out definition))
throw new InvalidOperationException("Invalid bitmap format: " + format);
header.FormatType = definition.FormatType;
header.BitsPerPixel = definition.BitsPerPixel;
header.RBitMask = definition.RBitMask;
header.GBitMask = definition.GBitMask;
header.BBitMask = definition.BBitMask;
header.ABitMask = definition.ABitMask;
header.FourCc = definition.FourCc;
header.D3D10Format = definition.D3D10Format;
}
public static BitmapFormat DetectFormat(DdsHeader header)
{
InitInjectionDefinitions();
var definition = new BitmapFormatDefinition
{
FormatType = header.FormatType,
BitsPerPixel = header.BitsPerPixel,
RBitMask = header.RBitMask,
GBitMask = header.GBitMask,
BBitMask = header.BBitMask,
ABitMask = header.ABitMask,
FourCc = header.FourCc,
D3D10Format = header.D3D10Format
};
BitmapFormat result;
if (!_injectionDefinitions.TryGetValue(definition, out result))
throw new InvalidOperationException("Unsupported pixel format");
return result;
}
/// <summary>
/// Reads a DDS header from a stream. On return, the stream will be positioned at the beginning of the texture data.
/// </summary>
/// <param name="stream">The stream to read from.</param>
/// <returns>The header that was read.</returns>
/// <exception cref="System.InvalidOperationException">Thrown if the DDS header is invalid.</exception>
public static DdsHeader Read(Stream stream)
{
var reader = new BinaryReader(stream);
if (stream.Length - stream.Position < 128)
throw new InvalidOperationException("Invalid DDS file: header is too small");
var result = new DdsHeader();
// Read and verify magic
if (reader.ReadUInt32() != DdsFourCc.FromString("DDS "))
throw new InvalidOperationException("Invalid DDS file: invalid header magic");
// Read the DDS header
result.ReadDdsHeader(reader);
// If the format FourCC is 'DX10', read the extended header
if (result.FourCc == DdsFourCc.FromString("DX10"))
result.ReadDdsD3D10Header(reader);
return result;
}
