public void Load(System.IO.Stream input)
{
BinaryReader Utility = new BinaryReader(input);
// Read the DDS tag. If it's not right, then bail..
uint ddsTag = Utility.ReadUInt32( );
if (ddsTag != 0x20534444)
{
throw new FormatException("File does not appear to be a DDS image");
}
// Read everything in.. for now assume it worked like a charm..
m_header.Read(input);
if ((m_header.m_pixelFormat.m_flags & ( int )DdsPixelFormat.PixelFormatFlags.FourCC) != 0)
{
int squishFlags = 0;
switch (m_header.m_pixelFormat.m_fourCC)
{
case 0x31545844:
squishFlags = ( int )Native.SquishFlags.DXT1;
break;
case 0x33545844:
squishFlags = ( int )Native.SquishFlags.DXT3;
break;
case 0x35545844:
squishFlags = ( int )Native.SquishFlags.DXT5;
break;
default:
throw new FormatException("File is not a supported DDS format");
}
// Compute size of compressed block area
int blockCount = ((GetWidth() + 3) / 4) * ((GetHeight() + 3) / 4);
int blockSize = ((squishFlags & ( int )Native.SquishFlags.DXT1) != 0) ? 8 : 16;
// Allocate room for compressed blocks, and read data into it.
byte[] compressedBlocks = new byte[blockCount * blockSize];
input.Read(compressedBlocks, 0, compressedBlocks.GetLength(0));
// Now decompress..
m_pixelData = Native.DecompressImage(compressedBlocks, GetWidth(), GetHeight(), squishFlags);
}
else
{
// We can only deal with the non-DXT formats we know about.. this is a bit of a mess..
// Sorry..
DdsFileFormat fileFormat = DdsFileFormat.INVALID;
if ((m_header.m_pixelFormat.m_flags == ( int )DdsPixelFormat.PixelFormatFlags.RGBA) &&
(m_header.m_pixelFormat.m_rgbBitCount == 32) &&
(m_header.m_pixelFormat.m_rBitMask == 0x00ff0000) && (m_header.m_pixelFormat.m_gBitMask == 0x0000ff00) &&
(m_header.m_pixelFormat.m_bBitMask == 0x000000ff) && (m_header.m_pixelFormat.m_aBitMask == 0xff000000))
{
fileFormat = DdsFileFormat.A8R8G8B8;
}
else
if ((m_header.m_pixelFormat.m_flags == ( int )DdsPixelFormat.PixelFormatFlags.RGB) &&
(m_header.m_pixelFormat.m_rgbBitCount == 32) &&
(m_header.m_pixelFormat.m_rBitMask == 0x00ff0000) && (m_header.m_pixelFormat.m_gBitMask == 0x0000ff00) &&
(m_header.m_pixelFormat.m_bBitMask == 0x000000ff) && (m_header.m_pixelFormat.m_aBitMask == 0x00000000))
{
fileFormat = DdsFileFormat.X8R8G8B8;
}
else
if ((m_header.m_pixelFormat.m_flags == ( int )DdsPixelFormat.PixelFormatFlags.RGBA) &&
(m_header.m_pixelFormat.m_rgbBitCount == 32) &&
(m_header.m_pixelFormat.m_rBitMask == 0x000000ff) && (m_header.m_pixelFormat.m_gBitMask == 0x0000ff00) &&
(m_header.m_pixelFormat.m_bBitMask == 0x00ff0000) && (m_header.m_pixelFormat.m_aBitMask == 0xff000000))
{
fileFormat = DdsFileFormat.A8B8G8R8;
}
else
if ((m_header.m_pixelFormat.m_flags == ( int )DdsPixelFormat.PixelFormatFlags.RGB) &&
(m_header.m_pixelFormat.m_rgbBitCount == 32) &&
(m_header.m_pixelFormat.m_rBitMask == 0x000000ff) && (m_header.m_pixelFormat.m_gBitMask == 0x0000ff00) &&
(m_header.m_pixelFormat.m_bBitMask == 0x00ff0000) && (m_header.m_pixelFormat.m_aBitMask == 0x00000000))
{
fileFormat = DdsFileFormat.X8B8G8R8;
}
else
if ((m_header.m_pixelFormat.m_flags == ( int )DdsPixelFormat.PixelFormatFlags.RGBA) &&
(m_header.m_pixelFormat.m_rgbBitCount == 16) &&
(m_header.m_pixelFormat.m_rBitMask == 0x00007c00) && (m_header.m_pixelFormat.m_gBitMask == 0x000003e0) &&
(m_header.m_pixelFormat.m_bBitMask == 0x0000001f) && (m_header.m_pixelFormat.m_aBitMask == 0x00008000))
{
fileFormat = DdsFileFormat.A1R5G5B5;
}
else
if ((m_header.m_pixelFormat.m_flags == ( int )DdsPixelFormat.PixelFormatFlags.RGBA) &&
(m_header.m_pixelFormat.m_rgbBitCount == 16) &&
(m_header.m_pixelFormat.m_rBitMask == 0x00000f00) && (m_header.m_pixelFormat.m_gBitMask == 0x000000f0) &&
(m_header.m_pixelFormat.m_bBitMask == 0x0000000f) && (m_header.m_pixelFormat.m_aBitMask == 0x0000f000))
{
fileFormat = DdsFileFormat.A4R4G4B4;
}
else
if ((m_header.m_pixelFormat.m_flags == ( int )DdsPixelFormat.PixelFormatFlags.RGB) &&
(m_header.m_pixelFormat.m_rgbBitCount == 24) &&
(m_header.m_pixelFormat.m_rBitMask == 0x00ff0000) && (m_header.m_pixelFormat.m_gBitMask == 0x0000ff00) &&
(m_header.m_pixelFormat.m_bBitMask == 0x000000ff) && (m_header.m_pixelFormat.m_aBitMask == 0x00000000))
{
fileFormat = DdsFileFormat.R8G8B8;
}
else
if ((m_header.m_pixelFormat.m_flags == ( int )DdsPixelFormat.PixelFormatFlags.RGB) &&
(m_header.m_pixelFormat.m_rgbBitCount == 16) &&
(m_header.m_pixelFormat.m_rBitMask == 0x0000f800) && (m_header.m_pixelFormat.m_gBitMask == 0x000007e0) &&
(m_header.m_pixelFormat.m_bBitMask == 0x0000001f) && (m_header.m_pixelFormat.m_aBitMask == 0x00000000))
{
fileFormat = DdsFileFormat.R5G6B5;
}
// If fileFormat is still invalid, then it's an unsupported format.
if (fileFormat == DdsFileFormat.INVALID)
{
throw new FormatException("File is not a supported DDS format");
}
// Size of a source pixel, in bytes
int srcPixelSize = (( int )m_header.m_pixelFormat.m_rgbBitCount / 8);
// We need the pitch for a row, so we can allocate enough memory for the load.
int rowPitch = 0;
if ((m_header.m_headerFlags & ( int )DdsHeader.HeaderFlags.Pitch) != 0)
{
// Pitch specified.. so we can use directly
rowPitch = ( int )m_header.m_pitchOrLinearSize;
}
else
if ((m_header.m_headerFlags & ( int )DdsHeader.HeaderFlags.LinerSize) != 0)
{
// Linear size specified.. compute row pitch. Of course, this should never happen
// as linear size is *supposed* to be for compressed textures. But Microsoft don't
// always play by the rules when it comes to DDS output.
rowPitch = ( int )m_header.m_pitchOrLinearSize / ( int )m_header.m_height;
}
else
{
// Another case of Microsoft not obeying their standard is the 'Convert to..' shell extension
// that ships in the DirectX SDK. Seems to always leave flags empty..so no indication of pitch
// or linear size. And - to cap it all off - they leave pitchOrLinearSize as *zero*. Zero??? If
// we get this bizarre set of inputs, we just go 'screw it' and compute row pitch ourselves,
// making sure we DWORD align it (if that code path is enabled).
rowPitch = (( int )m_header.m_width * srcPixelSize);
#if APPLY_PITCH_ALIGNMENT
rowPitch = ((( int )rowPitch + 3) & (~3));
#endif // APPLY_PITCH_ALIGNMENT
}
// System.Diagnostics.Debug.WriteLine( "Image width : " + m_header.m_width + ", rowPitch = " + rowPitch );
// Ok.. now, we need to allocate room for the bytes to read in from.. it's rowPitch bytes * height
byte[] readPixelData = new byte[rowPitch * m_header.m_height];
input.Read(readPixelData, 0, readPixelData.GetLength(0));
// We now need space for the real pixel data.. that's width * height * 4..
m_pixelData = new byte[m_header.m_width * m_header.m_height * 4];
// And now we have the arduous task of filling that up with stuff..
for (int destY = 0; destY < ( int )m_header.m_height; destY++)
{
for (int destX = 0; destX < ( int )m_header.m_width; destX++)
{
// Compute source pixel offset
int srcPixelOffset = (destY * rowPitch) + (destX * srcPixelSize);
// Read our pixel
uint pixelColour = 0;
uint pixelRed = 0;
uint pixelGreen = 0;
uint pixelBlue = 0;
uint pixelAlpha = 0;
// Build our pixel colour as a DWORD
for (int loop = 0; loop < srcPixelSize; loop++)
{
pixelColour |= ( uint )(readPixelData[srcPixelOffset + loop] << (8 * loop));
}
if (fileFormat == DdsFileFormat.A8R8G8B8)
{
pixelAlpha = (pixelColour >> 24) & 0xff;
pixelRed = (pixelColour >> 16) & 0xff;
pixelGreen = (pixelColour >> 8) & 0xff;
pixelBlue = (pixelColour >> 0) & 0xff;
}
else
if (fileFormat == DdsFileFormat.X8R8G8B8)
{
pixelAlpha = 0xff;
pixelRed = (pixelColour >> 16) & 0xff;
pixelGreen = (pixelColour >> 8) & 0xff;
pixelBlue = (pixelColour >> 0) & 0xff;
}
else
if (fileFormat == DdsFileFormat.A8B8G8R8)
{
pixelAlpha = (pixelColour >> 24) & 0xff;
pixelRed = (pixelColour >> 0) & 0xff;
pixelGreen = (pixelColour >> 8) & 0xff;
pixelBlue = (pixelColour >> 16) & 0xff;
}
else
if (fileFormat == DdsFileFormat.X8B8G8R8)
{
pixelAlpha = 0xff;
pixelRed = (pixelColour >> 0) & 0xff;
pixelGreen = (pixelColour >> 8) & 0xff;
pixelBlue = (pixelColour >> 16) & 0xff;
}
else
if (fileFormat == DdsFileFormat.A1R5G5B5)
{
pixelAlpha = (pixelColour >> 15) * 0xff;
pixelRed = (pixelColour >> 10) & 0x1f;
pixelGreen = (pixelColour >> 5) & 0x1f;
pixelBlue = (pixelColour >> 0) & 0x1f;
pixelRed = (pixelRed << 3) | (pixelRed >> 2);
pixelGreen = (pixelGreen << 3) | (pixelGreen >> 2);
pixelBlue = (pixelBlue << 3) | (pixelBlue >> 2);
}
else
if (fileFormat == DdsFileFormat.A4R4G4B4)
{
pixelAlpha = (pixelColour >> 12) & 0xff;
pixelRed = (pixelColour >> 8) & 0x0f;
pixelGreen = (pixelColour >> 4) & 0x0f;
pixelBlue = (pixelColour >> 0) & 0x0f;
pixelAlpha = (pixelAlpha << 4) | (pixelAlpha >> 0);
pixelRed = (pixelRed << 4) | (pixelRed >> 0);
pixelGreen = (pixelGreen << 4) | (pixelGreen >> 0);
pixelBlue = (pixelBlue << 4) | (pixelBlue >> 0);
}
else
if (fileFormat == DdsFileFormat.R8G8B8)
{
pixelAlpha = 0xff;
pixelRed = (pixelColour >> 16) & 0xff;
pixelGreen = (pixelColour >> 8) & 0xff;
pixelBlue = (pixelColour >> 0) & 0xff;
}
else
if (fileFormat == DdsFileFormat.R5G6B5)
{
pixelAlpha = 0xff;
pixelRed = (pixelColour >> 11) & 0x1f;
pixelGreen = (pixelColour >> 5) & 0x3f;
pixelBlue = (pixelColour >> 0) & 0x1f;
pixelRed = (pixelRed << 3) | (pixelRed >> 2);
pixelGreen = (pixelGreen << 2) | (pixelGreen >> 4);
pixelBlue = (pixelBlue << 3) | (pixelBlue >> 2);
}
// Write the colours away..
int destPixelOffset = (destY * ( int )m_header.m_width * 4) + (destX * 4);
m_pixelData[destPixelOffset + 0] = ( byte )pixelRed;
m_pixelData[destPixelOffset + 1] = ( byte )pixelGreen;
m_pixelData[destPixelOffset + 2] = ( byte )pixelBlue;
m_pixelData[destPixelOffset + 3] = ( byte )pixelAlpha;
}
}
}
}