private void Parse(BinaryReader reader)
{
DDSStruct header = new DDSStruct();
PixelFormat pixelFormat = PixelFormat.UNKNOWN;
byte[] data = null;
if (ReadHeader(reader, ref header))
{
_isValid = true;
// patches for stuff
if (header.depth == 0)
{
header.depth = 1;
}
uint blocksize = 0;
pixelFormat = GetFormat(header, ref blocksize);
if (pixelFormat == PixelFormat.UNKNOWN)
{
throw new InvalidFileHeaderException();
}
data = ReadData(reader, header);
if (data != null)
{
byte[] rawData = Decompressor.Expand(header, data, pixelFormat);
_bitmap = CreateBitmap((int)header.width, (int)header.height, rawData);
}
}
}
private byte[] ReadData(BinaryReader reader, DDSStruct header)
{
byte[] compdata = null;
uint compsize = 0;
if ((header.flags & Helper.DDSD_LINEARSIZE) > 1)
{
compdata = reader.ReadBytes((int)header.sizeorpitch);
compsize = (uint)compdata.Length;
}
else
{
uint bps = header.width * header.pixelformat.rgbbitcount / 8;
compsize = bps * header.height * header.depth;
compdata = new byte[compsize];
MemoryStream mem = new MemoryStream((int)compsize);
byte[] temp;
for (int z = 0; z < header.depth; z++)
{
for (int y = 0; y < header.height; y++)
{
temp = reader.ReadBytes((int)bps);
mem.Write(temp, 0, temp.Length);
}
}
mem.Seek(0, SeekOrigin.Begin);
mem.Read(compdata, 0, compdata.Length);
mem.Close();
}
return(compdata);
}
private static unsafe byte[] DecompressRGBA(DDSStruct header, byte[] data, PixelFormat pixelFormat)
{
// allocate bitmap
int bpp = (int)(Helper.PixelFormatToBpp(pixelFormat, header.pixelformat.rgbbitcount));
int bps = (int)(header.width * bpp * Helper.PixelFormatToBpc(pixelFormat));
int sizeofplane = (int)(bps * header.height);
int width = (int)header.width;
int height = (int)header.height;
int depth = (int)header.depth;
byte[] rawData = new byte[depth * sizeofplane + height * bps + width * bpp];
uint valMask = (uint)((header.pixelformat.rgbbitcount == 32) ? ~0 : (1 << (int)header.pixelformat.rgbbitcount) - 1);
// Funny x86s, make 1 << 32 == 1
uint pixSize = (header.pixelformat.rgbbitcount + 7) / 8;
int rShift1 = 0; int rMul = 0; int rShift2 = 0;
Helper.ComputeMaskParams(header.pixelformat.rbitmask, ref rShift1, ref rMul, ref rShift2);
int gShift1 = 0; int gMul = 0; int gShift2 = 0;
Helper.ComputeMaskParams(header.pixelformat.gbitmask, ref gShift1, ref gMul, ref gShift2);
int bShift1 = 0; int bMul = 0; int bShift2 = 0;
Helper.ComputeMaskParams(header.pixelformat.bbitmask, ref bShift1, ref bMul, ref bShift2);
int aShift1 = 0; int aMul = 0; int aShift2 = 0;
Helper.ComputeMaskParams(header.pixelformat.alphabitmask, ref aShift1, ref aMul, ref aShift2);
int offset = 0;
int pixnum = width * height * depth;
fixed(byte *bytePtr = data)
{
byte *temp = bytePtr;
while (pixnum-- > 0)
{
uint px = *((uint *)temp) & valMask;
temp += pixSize;
uint pxc = px & header.pixelformat.rbitmask;
rawData[offset + 0] = (byte)(((pxc >> rShift1) * rMul) >> rShift2);
pxc = px & header.pixelformat.gbitmask;
rawData[offset + 1] = (byte)(((pxc >> gShift1) * gMul) >> gShift2);
pxc = px & header.pixelformat.bbitmask;
rawData[offset + 2] = (byte)(((pxc >> bShift1) * bMul) >> bShift2);
pxc = px & header.pixelformat.alphabitmask;
rawData[offset + 3] = (byte)(((pxc >> aShift1) * aMul) >> aShift2);
offset += 4;
}
}
return(rawData);
}
private static byte[] DecompressDXT4(DDSStruct header, byte[] data, PixelFormat pixelFormat)
{
// allocate bitmap
int width = (int)header.width;
int height = (int)header.height;
int depth = (int)header.depth;
// Can do color & alpha same as dxt5, but color is pre-multiplied
// so the result will be wrong unless corrected.
byte[] rawData = DecompressDXT5(header, data, pixelFormat);
Helper.CorrectPremult((uint)(width * height * depth), ref rawData);
return(rawData);
}
private bool ReadHeader(BinaryReader reader, ref DDSStruct header)
{
byte[] signature = reader.ReadBytes(4);
if (!(signature[0] == 'D' && signature[1] == 'D' && signature[2] == 'S' && signature[3] == ' '))
{
return(false);
}
header.size = reader.ReadUInt32();
if (header.size != 124)
{
return(false);
}
//convert the data
header.flags = reader.ReadUInt32();
header.height = reader.ReadUInt32();
header.width = reader.ReadUInt32();
header.sizeorpitch = reader.ReadUInt32();
header.depth = reader.ReadUInt32();
header.mipmapcount = reader.ReadUInt32();
header.alphabitdepth = reader.ReadUInt32();
header.reserved = new uint[10];
for (int i = 0; i < 10; i++)
{
header.reserved[i] = reader.ReadUInt32();
}
//pixelfromat
header.pixelformat.size = reader.ReadUInt32();
header.pixelformat.flags = reader.ReadUInt32();
header.pixelformat.fourcc = reader.ReadUInt32();
header.pixelformat.rgbbitcount = reader.ReadUInt32();
header.pixelformat.rbitmask = reader.ReadUInt32();
header.pixelformat.gbitmask = reader.ReadUInt32();
header.pixelformat.bbitmask = reader.ReadUInt32();
header.pixelformat.alphabitmask = reader.ReadUInt32();
//caps
header.ddscaps.caps1 = reader.ReadUInt32();
header.ddscaps.caps2 = reader.ReadUInt32();
header.ddscaps.caps3 = reader.ReadUInt32();
header.ddscaps.caps4 = reader.ReadUInt32();
header.texturestage = reader.ReadUInt32();
return(true);
}
private static unsafe byte[] DecompressLum(DDSStruct header, byte[] data, PixelFormat pixelFormat)
{
// allocate bitmap
int bpp = (int)(Helper.PixelFormatToBpp(pixelFormat, header.pixelformat.rgbbitcount));
int bps = (int)(header.width * bpp * Helper.PixelFormatToBpc(pixelFormat));
int sizeofplane = (int)(bps * header.height);
int width = (int)header.width;
int height = (int)header.height;
int depth = (int)header.depth;
byte[] rawData = new byte[depth * sizeofplane + height * bps + width * bpp];
int lShift1 = 0; int lMul = 0; int lShift2 = 0;
Helper.ComputeMaskParams(header.pixelformat.rbitmask, ref lShift1, ref lMul, ref lShift2);
int offset = 0;
int pixnum = width * height * depth;
fixed(byte *bytePtr = data)
{
byte *temp = bytePtr;
while (pixnum-- > 0)
{
byte px = *(temp++);
rawData[offset + 0] = (byte)(((px >> lShift1) * lMul) >> lShift2);
rawData[offset + 1] = (byte)(((px >> lShift1) * lMul) >> lShift2);
rawData[offset + 2] = (byte)(((px >> lShift1) * lMul) >> lShift2);
rawData[offset + 3] = (byte)(((px >> lShift1) * lMul) >> lShift2);
offset += 4;
}
}
return(rawData);
}
private static unsafe byte[] DecompressFloat(DDSStruct header, byte[] data, PixelFormat pixelFormat)
{
// allocate bitmap
int bpp = (int)(Helper.PixelFormatToBpp(pixelFormat, header.pixelformat.rgbbitcount));
int bps = (int)(header.width * bpp * Helper.PixelFormatToBpc(pixelFormat));
int sizeofplane = (int)(bps * header.height);
int width = (int)header.width;
int height = (int)header.height;
int depth = (int)header.depth;
byte[] rawData = new byte[depth * sizeofplane + height * bps + width * bpp];
int size = 0;
fixed(byte *bytePtr = data)
{
byte *temp = bytePtr;
fixed(byte *destPtr = rawData)
{
byte *destData = destPtr;
switch (pixelFormat)
{
case PixelFormat.R32F: // Red float, green = blue = max
size = width * height * depth * 3;
for (int i = 0, j = 0; i < size; i += 3, j++)
{
((float *)destData)[i] = ((float *)temp)[j];
((float *)destData)[i + 1] = 1.0f;
((float *)destData)[i + 2] = 1.0f;
}
break;
case PixelFormat.A32B32G32R32F: // Direct copy of float RGBA data
Array.Copy(data, rawData, data.Length);
break;
case PixelFormat.G32R32F: // Red float, green float, blue = max
size = width * height * depth * 3;
for (int i = 0, j = 0; i < size; i += 3, j += 2)
{
((float *)destData)[i] = ((float *)temp)[j];
((float *)destData)[i + 1] = ((float *)temp)[j + 1];
((float *)destData)[i + 2] = 1.0f;
}
break;
case PixelFormat.R16F: // Red float, green = blue = max
size = width * height * depth * bpp;
Helper.ConvR16ToFloat32((uint *)destData, (ushort *)temp, (uint)size);
break;
case PixelFormat.A16B16G16R16F: // Just convert from half to float.
size = width * height * depth * bpp;
Helper.ConvFloat16ToFloat32((uint *)destData, (ushort *)temp, (uint)size);
break;
case PixelFormat.G16R16F: // Convert from half to float, set blue = max.
size = width * height * depth * bpp;
Helper.ConvG16R16ToFloat32((uint *)destData, (ushort *)temp, (uint)size);
break;
default:
break;
}
}
}
return(rawData);
}
private static unsafe byte[] DecompressRXGB(DDSStruct header, byte[] data, PixelFormat pixelFormat)
{
// allocate bitmap
int bpp = (int)(Helper.PixelFormatToBpp(pixelFormat, header.pixelformat.rgbbitcount));
int bps = (int)(header.width * bpp * Helper.PixelFormatToBpc(pixelFormat));
int sizeofplane = (int)(bps * header.height);
int width = (int)header.width;
int height = (int)header.height;
int depth = (int)header.depth;
byte[] rawData = new byte[depth * sizeofplane + height * bps + width * bpp];
Colour565 color_0 = new Colour565();
Colour565 color_1 = new Colour565();
Colour8888[] colours = new Colour8888[4];
byte[] alphas = new byte[8];
fixed(byte *bytePtr = data)
{
byte *temp = bytePtr;
for (int z = 0; z < depth; z++)
{
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
if (y >= height || x >= width)
{
break;
}
alphas[0] = temp[0];
alphas[1] = temp[1];
byte *alphamask = temp + 2;
temp += 8;
Helper.DxtcReadColors(temp, ref color_0, ref color_1);
temp += 4;
uint bitmask = ((uint *)temp)[1];
temp += 4;
colours[0].red = (byte)(color_0.red << 3);
colours[0].green = (byte)(color_0.green << 2);
colours[0].blue = (byte)(color_0.blue << 3);
colours[0].alpha = 0xFF;
colours[1].red = (byte)(color_1.red << 3);
colours[1].green = (byte)(color_1.green << 2);
colours[1].blue = (byte)(color_1.blue << 3);
colours[1].alpha = 0xFF;
// Four-color block: derive the other two colors.
// 00 = color_0, 01 = color_1, 10 = color_2, 11 = color_3
// These 2-bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
colours[2].blue = (byte)((2 * colours[0].blue + colours[1].blue + 1) / 3);
colours[2].green = (byte)((2 * colours[0].green + colours[1].green + 1) / 3);
colours[2].red = (byte)((2 * colours[0].red + colours[1].red + 1) / 3);
colours[2].alpha = 0xFF;
colours[3].blue = (byte)((colours[0].blue + 2 * colours[1].blue + 1) / 3);
colours[3].green = (byte)((colours[0].green + 2 * colours[1].green + 1) / 3);
colours[3].red = (byte)((colours[0].red + 2 * colours[1].red + 1) / 3);
colours[3].alpha = 0xFF;
int k = 0;
for (int j = 0; j < 4; j++)
{
for (int i = 0; i < 4; i++, k++)
{
int select = (int)((bitmask & (0x03 << k * 2)) >> k * 2);
Colour8888 col = colours[select];
// only put pixels out < width or height
if (((x + i) < width) && ((y + j) < height))
{
uint offset = (uint)(z * sizeofplane + (y + j) * bps + (x + i) * bpp);
rawData[offset + 0] = col.red;
rawData[offset + 1] = col.green;
rawData[offset + 2] = col.blue;
}
}
}
// 8-alpha or 6-alpha block?
if (alphas[0] > alphas[1])
{
// 8-alpha block: derive the other six alphas.
// Bit code 000 = alpha_0, 001 = alpha_1, others are interpolated.
alphas[2] = (byte)((6 * alphas[0] + 1 * alphas[1] + 3) / 7); // bit code 010
alphas[3] = (byte)((5 * alphas[0] + 2 * alphas[1] + 3) / 7); // bit code 011
alphas[4] = (byte)((4 * alphas[0] + 3 * alphas[1] + 3) / 7); // bit code 100
alphas[5] = (byte)((3 * alphas[0] + 4 * alphas[1] + 3) / 7); // bit code 101
alphas[6] = (byte)((2 * alphas[0] + 5 * alphas[1] + 3) / 7); // bit code 110
alphas[7] = (byte)((1 * alphas[0] + 6 * alphas[1] + 3) / 7); // bit code 111
}
else
{
// 6-alpha block.
// Bit code 000 = alpha_0, 001 = alpha_1, others are interpolated.
alphas[2] = (byte)((4 * alphas[0] + 1 * alphas[1] + 2) / 5); // Bit code 010
alphas[3] = (byte)((3 * alphas[0] + 2 * alphas[1] + 2) / 5); // Bit code 011
alphas[4] = (byte)((2 * alphas[0] + 3 * alphas[1] + 2) / 5); // Bit code 100
alphas[5] = (byte)((1 * alphas[0] + 4 * alphas[1] + 2) / 5); // Bit code 101
alphas[6] = 0x00; // Bit code 110
alphas[7] = 0xFF; // Bit code 111
}
// Note: Have to separate the next two loops,
// it operates on a 6-byte system.
// First three bytes
uint bits = *((uint *)alphamask);
for (int j = 0; j < 2; j++)
{
for (int i = 0; i < 4; i++)
{
// only put pixels out < width or height
if (((x + i) < width) && ((y + j) < height))
{
uint offset = (uint)(z * sizeofplane + (y + j) * bps + (x + i) * bpp + 3);
rawData[offset] = alphas[bits & 0x07];
}
bits >>= 3;
}
}
// Last three bytes
bits = *((uint *)&alphamask[3]);
for (int j = 2; j < 4; j++)
{
for (int i = 0; i < 4; i++)
{
// only put pixels out < width or height
if (((x + i) < width) && ((y + j) < height))
{
uint offset = (uint)(z * sizeofplane + (y + j) * bps + (x + i) * bpp + 3);
rawData[offset] = alphas[bits & 0x07];
}
bits >>= 3;
}
}
}
}
}
}
return(rawData);
}
private static unsafe byte[] DecompressDXT1(DDSStruct header, byte[] data, PixelFormat pixelFormat)
{
// allocate bitmap
int bpp = (int)(Helper.PixelFormatToBpp(pixelFormat, header.pixelformat.rgbbitcount));
int bps = (int)(header.width * bpp * Helper.PixelFormatToBpc(pixelFormat));
int sizeofplane = (int)(bps * header.height);
int width = (int)header.width;
int height = (int)header.height;
int depth = (int)header.depth;
// DXT1 decompressor
byte[] rawData = new byte[depth * sizeofplane + height * bps + width * bpp];
Colour8888[] colours = new Colour8888[4];
colours[0].alpha = 0xFF;
colours[1].alpha = 0xFF;
colours[2].alpha = 0xFF;
fixed(byte *bytePtr = data)
{
byte *temp = bytePtr;
for (int z = 0; z < depth; z++)
{
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
ushort colour0 = *((ushort *)temp);
ushort colour1 = *((ushort *)(temp + 2));
Helper.DxtcReadColor(colour0, ref colours[0]);
Helper.DxtcReadColor(colour1, ref colours[1]);
uint bitmask = ((uint *)temp)[1];
temp += 8;
if (colour0 > colour1)
{
// Four-color block: derive the other two colors.
// 00 = color_0, 01 = color_1, 10 = color_2, 11 = color_3
// These 2-bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
colours[2].blue = (byte)((2 * colours[0].blue + colours[1].blue + 1) / 3);
colours[2].green = (byte)((2 * colours[0].green + colours[1].green + 1) / 3);
colours[2].red = (byte)((2 * colours[0].red + colours[1].red + 1) / 3);
//colours[2].alpha = 0xFF;
colours[3].blue = (byte)((colours[0].blue + 2 * colours[1].blue + 1) / 3);
colours[3].green = (byte)((colours[0].green + 2 * colours[1].green + 1) / 3);
colours[3].red = (byte)((colours[0].red + 2 * colours[1].red + 1) / 3);
colours[3].alpha = 0xFF;
}
else
{
// Three-color block: derive the other color.
// 00 = color_0, 01 = color_1, 10 = color_2,
// 11 = transparent.
// These 2-bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
colours[2].blue = (byte)((colours[0].blue + colours[1].blue) / 2);
colours[2].green = (byte)((colours[0].green + colours[1].green) / 2);
colours[2].red = (byte)((colours[0].red + colours[1].red) / 2);
//colours[2].alpha = 0xFF;
colours[3].blue = (byte)((colours[0].blue + 2 * colours[1].blue + 1) / 3);
colours[3].green = (byte)((colours[0].green + 2 * colours[1].green + 1) / 3);
colours[3].red = (byte)((colours[0].red + 2 * colours[1].red + 1) / 3);
colours[3].alpha = 0x00;
}
for (int j = 0, k = 0; j < 4; j++)
{
for (int i = 0; i < 4; i++, k++)
{
int select = (int)((bitmask & (0x03 << k * 2)) >> k * 2);
Colour8888 col = colours[select];
if (((x + i) < width) && ((y + j) < height))
{
uint offset = (uint)(z * sizeofplane + (y + j) * bps + (x + i) * bpp);
rawData[offset + 0] = (byte)col.red;
rawData[offset + 1] = (byte)col.green;
rawData[offset + 2] = (byte)col.blue;
rawData[offset + 3] = (byte)col.alpha;
}
}
}
}
}
}
}
return(rawData);
}
private static unsafe byte[] DecompressAti1n(DDSStruct header, byte[] data, PixelFormat pixelFormat)
{
// allocate bitmap
int bpp = (int)(Helper.PixelFormatToBpp(pixelFormat, header.pixelformat.rgbbitcount));
int bps = (int)(header.width * bpp * Helper.PixelFormatToBpc(pixelFormat));
int sizeofplane = (int)(bps * header.height);
int width = (int)header.width;
int height = (int)header.height;
int depth = (int)header.depth;
byte[] rawData = new byte[depth * sizeofplane + height * bps + width * bpp];
byte[] colours = new byte[8];
uint offset = 0;
fixed(byte *bytePtr = data)
{
byte *temp = bytePtr;
for (int z = 0; z < depth; z++)
{
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
//Read palette
int t1 = colours[0] = temp[0];
int t2 = colours[1] = temp[1];
temp += 2;
if (t1 > t2)
{
for (int i = 2; i < 8; ++i)
{
colours[i] = (byte)(t1 + ((t2 - t1) * (i - 1)) / 7);
}
}
else
{
for (int i = 2; i < 6; ++i)
{
colours[i] = (byte)(t1 + ((t2 - t1) * (i - 1)) / 5);
}
colours[6] = 0;
colours[7] = 255;
}
//decompress pixel data
uint currOffset = offset;
for (int k = 0; k < 4; k += 2)
{
// First three bytes
uint bitmask = ((uint)(temp[0]) << 0) | ((uint)(temp[1]) << 8) | ((uint)(temp[2]) << 16);
for (int j = 0; j < 2; j++)
{
// only put pixels out < height
if ((y + k + j) < height)
{
for (int i = 0; i < 4; i++)
{
// only put pixels out < width
if (((x + i) < width))
{
t1 = (int)(currOffset + (x + i));
rawData[t1] = colours[bitmask & 0x07];
}
bitmask >>= 3;
}
currOffset += (uint)bps;
}
}
temp += 3;
}
}
offset += (uint)(bps * 4);
}
}
}
return(rawData);
}
internal static byte[] Expand(DDSStruct header, byte[] data, PixelFormat pixelFormat)
{
// allocate bitmap
byte[] rawData = null;
switch (pixelFormat)
{
case PixelFormat.RGBA:
rawData = DecompressRGBA(header, data, pixelFormat);
break;
case PixelFormat.RGB:
rawData = DecompressRGB(header, data, pixelFormat);
break;
case PixelFormat.LUMINANCE:
case PixelFormat.LUMINANCE_ALPHA:
rawData = DecompressLum(header, data, pixelFormat);
break;
case PixelFormat.DXT1:
rawData = DecompressDXT1(header, data, pixelFormat);
break;
case PixelFormat.DXT2:
rawData = DecompressDXT2(header, data, pixelFormat);
break;
case PixelFormat.DXT3:
rawData = DecompressDXT3(header, data, pixelFormat);
break;
case PixelFormat.DXT4:
rawData = DecompressDXT4(header, data, pixelFormat);
break;
case PixelFormat.DXT5:
rawData = DecompressDXT5(header, data, pixelFormat);
break;
case PixelFormat.THREEDC:
rawData = Decompress3Dc(header, data, pixelFormat);
break;
case PixelFormat.ATI1N:
rawData = DecompressAti1n(header, data, pixelFormat);
break;
case PixelFormat.RXGB:
rawData = DecompressRXGB(header, data, pixelFormat);
break;
case PixelFormat.R16F:
case PixelFormat.G16R16F:
case PixelFormat.A16B16G16R16F:
case PixelFormat.R32F:
case PixelFormat.G32R32F:
case PixelFormat.A32B32G32R32F:
rawData = DecompressFloat(header, data, pixelFormat);
break;
default:
throw new UnknownFileFormatException();
}
return(rawData);
}
private static unsafe byte[] Decompress3Dc(DDSStruct header, byte[] data, PixelFormat pixelFormat)
{
// allocate bitmap
int bpp = (int)(Helper.PixelFormatToBpp(pixelFormat, header.pixelformat.rgbbitcount));
int bps = (int)(header.width * bpp * Helper.PixelFormatToBpc(pixelFormat));
int sizeofplane = (int)(bps * header.height);
int width = (int)header.width;
int height = (int)header.height;
int depth = (int)header.depth;
byte[] rawData = new byte[depth * sizeofplane + height * bps + width * bpp];
byte[] yColours = new byte[8];
byte[] xColours = new byte[8];
int offset = 0;
fixed(byte *bytePtr = data)
{
byte *temp = bytePtr;
for (int z = 0; z < depth; z++)
{
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
byte *temp2 = temp + 8;
//Read Y palette
int t1 = yColours[0] = temp[0];
int t2 = yColours[1] = temp[1];
temp += 2;
if (t1 > t2)
{
for (int i = 2; i < 8; ++i)
{
yColours[i] = (byte)(t1 + ((t2 - t1) * (i - 1)) / 7);
}
}
else
{
for (int i = 2; i < 6; ++i)
{
yColours[i] = (byte)(t1 + ((t2 - t1) * (i - 1)) / 5);
}
yColours[6] = 0;
yColours[7] = 255;
}
// Read X palette
t1 = xColours[0] = temp2[0];
t2 = xColours[1] = temp2[1];
temp2 += 2;
if (t1 > t2)
{
for (int i = 2; i < 8; ++i)
{
xColours[i] = (byte)(t1 + ((t2 - t1) * (i - 1)) / 7);
}
}
else
{
for (int i = 2; i < 6; ++i)
{
xColours[i] = (byte)(t1 + ((t2 - t1) * (i - 1)) / 5);
}
xColours[6] = 0;
xColours[7] = 255;
}
//decompress pixel data
int currentOffset = offset;
for (int k = 0; k < 4; k += 2)
{
// First three bytes
uint bitmask = ((uint)(temp[0]) << 0) | ((uint)(temp[1]) << 8) | ((uint)(temp[2]) << 16);
uint bitmask2 = ((uint)(temp2[0]) << 0) | ((uint)(temp2[1]) << 8) | ((uint)(temp2[2]) << 16);
for (int j = 0; j < 2; j++)
{
// only put pixels out < height
if ((y + k + j) < height)
{
for (int i = 0; i < 4; i++)
{
// only put pixels out < width
if (((x + i) < width))
{
int t;
byte tx, ty;
t1 = currentOffset + (x + i) * 3;
rawData[t1 + 1] = ty = yColours[bitmask & 0x07];
rawData[t1 + 0] = tx = xColours[bitmask2 & 0x07];
//calculate b (z) component ((r/255)^2 + (g/255)^2 + (b/255)^2 = 1
t = 127 * 128 - (tx - 127) * (tx - 128) - (ty - 127) * (ty - 128);
if (t > 0)
{
rawData[t1 + 2] = (byte)(Math.Sqrt(t) + 128);
}
else
{
rawData[t1 + 2] = 0x7F;
}
}
bitmask >>= 3;
bitmask2 >>= 3;
}
currentOffset += bps;
}
}
temp += 3;
temp2 += 3;
}
//skip bytes that were read via Temp2
temp += 8;
}
offset += bps * 4;
}
}
}
return(rawData);
}
private static unsafe byte[] DecompressDXT3(DDSStruct header, byte[] data, PixelFormat pixelFormat)
{
// allocate bitmap
int bpp = (int)(Helper.PixelFormatToBpp(pixelFormat, header.pixelformat.rgbbitcount));
int bps = (int)(header.width * bpp * Helper.PixelFormatToBpc(pixelFormat));
int sizeofplane = (int)(bps * header.height);
int width = (int)header.width;
int height = (int)header.height;
int depth = (int)header.depth;
// DXT3 decompressor
byte[] rawData = new byte[depth * sizeofplane + height * bps + width * bpp];
Colour8888[] colours = new Colour8888[4];
fixed(byte *bytePtr = data)
{
byte *temp = bytePtr;
for (int z = 0; z < depth; z++)
{
for (int y = 0; y < height; y += 4)
{
for (int x = 0; x < width; x += 4)
{
byte *alpha = temp;
temp += 8;
Helper.DxtcReadColors(temp, ref colours);
temp += 4;
uint bitmask = ((uint *)temp)[1];
temp += 4;
// Four-color block: derive the other two colors.
// 00 = color_0, 01 = color_1, 10 = color_2, 11 = color_3
// These 2-bit codes correspond to the 2-bit fields
// stored in the 64-bit block.
colours[2].blue = (byte)((2 * colours[0].blue + colours[1].blue + 1) / 3);
colours[2].green = (byte)((2 * colours[0].green + colours[1].green + 1) / 3);
colours[2].red = (byte)((2 * colours[0].red + colours[1].red + 1) / 3);
//colours[2].alpha = 0xFF;
colours[3].blue = (byte)((colours[0].blue + 2 * colours[1].blue + 1) / 3);
colours[3].green = (byte)((colours[0].green + 2 * colours[1].green + 1) / 3);
colours[3].red = (byte)((colours[0].red + 2 * colours[1].red + 1) / 3);
//colours[3].alpha = 0xFF;
for (int j = 0, k = 0; j < 4; j++)
{
for (int i = 0; i < 4; k++, i++)
{
int select = (int)((bitmask & (0x03 << k * 2)) >> k * 2);
if (((x + i) < width) && ((y + j) < height))
{
uint offset = (uint)(z * sizeofplane + (y + j) * bps + (x + i) * bpp);
rawData[offset + 0] = (byte)colours[select].red;
rawData[offset + 1] = (byte)colours[select].green;
rawData[offset + 2] = (byte)colours[select].blue;
}
}
}
for (int j = 0; j < 4; j++)
{
//ushort word = (ushort)(alpha[2 * j] + 256 * alpha[2 * j + 1]);
ushort word = (ushort)(alpha[2 * j] | (alpha[2 * j + 1] << 8));
for (int i = 0; i < 4; i++)
{
if (((x + i) < width) && ((y + j) < height))
{
uint offset = (uint)(z * sizeofplane + (y + j) * bps + (x + i) * bpp + 3);
rawData[offset] = (byte)(word & 0x0F);
rawData[offset] = (byte)(rawData[offset] | (rawData[offset] << 4));
}
word >>= 4;
}
}
}
}
}
}
return(rawData);
}
private PixelFormat GetFormat(DDSStruct header, ref uint blocksize)
{
PixelFormat format = PixelFormat.UNKNOWN;
if ((header.pixelformat.flags & Helper.DDPF_FOURCC) == Helper.DDPF_FOURCC)
{
blocksize = ((header.width + 3) / 4) * ((header.height + 3) / 4) * header.depth;
switch (header.pixelformat.fourcc)
{
case Helper.FOURCC_DXT1:
format = PixelFormat.DXT1;
blocksize *= 8;
break;
case Helper.FOURCC_DXT2:
format = PixelFormat.DXT2;
blocksize *= 16;
break;
case Helper.FOURCC_DXT3:
format = PixelFormat.DXT3;
blocksize *= 16;
break;
case Helper.FOURCC_DXT4:
format = PixelFormat.DXT4;
blocksize *= 16;
break;
case Helper.FOURCC_DXT5:
format = PixelFormat.DXT5;
blocksize *= 16;
break;
case Helper.FOURCC_ATI1:
format = PixelFormat.ATI1N;
blocksize *= 8;
break;
case Helper.FOURCC_ATI2:
format = PixelFormat.THREEDC;
blocksize *= 16;
break;
case Helper.FOURCC_RXGB:
format = PixelFormat.RXGB;
blocksize *= 16;
break;
case Helper.FOURCC_DOLLARNULL:
format = PixelFormat.A16B16G16R16;
blocksize = header.width * header.height * header.depth * 8;
break;
case Helper.FOURCC_oNULL:
format = PixelFormat.R16F;
blocksize = header.width * header.height * header.depth * 2;
break;
case Helper.FOURCC_pNULL:
format = PixelFormat.G16R16F;
blocksize = header.width * header.height * header.depth * 4;
break;
case Helper.FOURCC_qNULL:
format = PixelFormat.A16B16G16R16F;
blocksize = header.width * header.height * header.depth * 8;
break;
case Helper.FOURCC_rNULL:
format = PixelFormat.R32F;
blocksize = header.width * header.height * header.depth * 4;
break;
case Helper.FOURCC_sNULL:
format = PixelFormat.G32R32F;
blocksize = header.width * header.height * header.depth * 8;
break;
case Helper.FOURCC_tNULL:
format = PixelFormat.A32B32G32R32F;
blocksize = header.width * header.height * header.depth * 16;
break;
default:
format = PixelFormat.UNKNOWN;
blocksize *= 16;
break;
}
}
else
{
// uncompressed image
if ((header.pixelformat.flags & Helper.DDPF_LUMINANCE) == Helper.DDPF_LUMINANCE)
{
if ((header.pixelformat.flags & Helper.DDPF_ALPHAPIXELS) == Helper.DDPF_ALPHAPIXELS)
{
format = PixelFormat.LUMINANCE_ALPHA;
}
else
{
format = PixelFormat.LUMINANCE;
}
}
else
{
if ((header.pixelformat.flags & Helper.DDPF_ALPHAPIXELS) == Helper.DDPF_ALPHAPIXELS)
{
format = PixelFormat.RGBA;
}
else
{
format = PixelFormat.RGB;
}
}
blocksize = (header.width * header.height * header.depth * (header.pixelformat.rgbbitcount >> 3));
}
return(format);
}