private static void Unquantize(ref RgbaColor32 color, int colorDepth, int alphaDepth, int pBit)
{
color.R = UnquantizeComponent(color.R, colorDepth, pBit);
color.G = UnquantizeComponent(color.G, colorDepth, pBit);
color.B = UnquantizeComponent(color.B, colorDepth, pBit);
color.A = alphaDepth != 0 ? UnquantizeComponent(color.A, alphaDepth, pBit) : 255;
}
private static unsafe int GetEndPointSelectionErrorFast(ReadOnlySpan <uint> tile, int subsetCount, int partition, int w, int h, int maxError)
{
byte[] partitionTable = BC67Tables.PartitionTable[subsetCount - 1][partition];
Span <RgbaColor8> minColors = stackalloc RgbaColor8[subsetCount];
Span <RgbaColor8> maxColors = stackalloc RgbaColor8[subsetCount];
BC67Utils.GetMinMaxColors(partitionTable, tile, w, h, minColors, maxColors, subsetCount);
Span <uint> endPoints0 = stackalloc uint[subsetCount];
Span <uint> endPoints1 = stackalloc uint[subsetCount];
SelectEndPointsFast(partitionTable, tile, w, h, subsetCount, minColors, maxColors, endPoints0, endPoints1, uint.MaxValue);
Span <RgbaColor32> palette = stackalloc RgbaColor32[8];
int errorSum = 0;
for (int subset = 0; subset < subsetCount; subset++)
{
RgbaColor32 blockDir = maxColors[subset].GetColor32() - minColors[subset].GetColor32();
int sum = blockDir.R + blockDir.G + blockDir.B + blockDir.A;
if (sum != 0)
{
blockDir = (blockDir << 6) / new RgbaColor32(sum);
}
uint c0 = endPoints0[subset];
uint c1 = endPoints1[subset];
int pBit0 = GetPBit(c0, 6, 0);
int pBit1 = GetPBit(c1, 6, 0);
c0 = BC67Utils.Quantize(RgbaColor8.FromUInt32(c0), 6, 0, pBit0).ToUInt32();
c1 = BC67Utils.Quantize(RgbaColor8.FromUInt32(c1), 6, 0, pBit1).ToUInt32();
if (Sse41.IsSupported)
{
Vector128 <byte> c0Rep = Vector128.Create(c0).AsByte();
Vector128 <byte> c1Rep = Vector128.Create(c1).AsByte();
Vector128 <byte> c0c1 = Sse2.UnpackLow(c0Rep, c1Rep);
Vector128 <byte> rWeights;
Vector128 <byte> lWeights;
fixed(byte *pWeights = BC67Tables.Weights[1], pInvWeights = BC67Tables.InverseWeights[1])
{
rWeights = Sse2.LoadScalarVector128((ulong *)pWeights).AsByte();
lWeights = Sse2.LoadScalarVector128((ulong *)pInvWeights).AsByte();
}
Vector128 <byte> iWeights = Sse2.UnpackLow(rWeights, lWeights);
Vector128 <byte> iWeights01 = Sse2.UnpackLow(iWeights.AsInt16(), iWeights.AsInt16()).AsByte();
Vector128 <byte> iWeights23 = Sse2.UnpackHigh(iWeights.AsInt16(), iWeights.AsInt16()).AsByte();
Vector128 <byte> iWeights0 = Sse2.UnpackLow(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
Vector128 <byte> iWeights1 = Sse2.UnpackHigh(iWeights01.AsInt16(), iWeights01.AsInt16()).AsByte();
Vector128 <byte> iWeights2 = Sse2.UnpackLow(iWeights23.AsInt16(), iWeights23.AsInt16()).AsByte();
Vector128 <byte> iWeights3 = Sse2.UnpackHigh(iWeights23.AsInt16(), iWeights23.AsInt16()).AsByte();
private static void DecodeBlock(Block block, Span <uint> output, int w, int h, int width)
{
int mode = BitOperations.TrailingZeroCount((byte)block.Low | 0x100);
if (mode == 8)
{
// Mode is invalid, the spec mandates that hardware fills the block with
// a transparent black color.
for (int ty = 0; ty < h; ty++)
{
int baseOffs = ty * width;
for (int tx = 0; tx < w; tx++)
{
int offs = baseOffs + tx;
output[offs] = 0;
}
}
return;
}
BC7ModeInfo modeInfo = BC67Tables.BC7ModeInfos[mode];
int offset = mode + 1;
int partition = (int)block.Decode(ref offset, modeInfo.PartitionBitCount);
int rotation = (int)block.Decode(ref offset, modeInfo.RotationBitCount);
int indexMode = (int)block.Decode(ref offset, modeInfo.IndexModeBitCount);
Debug.Assert(partition < 64);
Debug.Assert(rotation < 4);
Debug.Assert(indexMode < 2);
int endPointCount = modeInfo.SubsetCount * 2;
Span <RgbaColor32> endPoints = stackalloc RgbaColor32[endPointCount];
Span <byte> pValues = stackalloc byte[modeInfo.PBits];
endPoints.Fill(new RgbaColor32(0, 0, 0, 255));
for (int i = 0; i < endPointCount; i++)
{
endPoints[i].R = (int)block.Decode(ref offset, modeInfo.ColorDepth);
}
for (int i = 0; i < endPointCount; i++)
{
endPoints[i].G = (int)block.Decode(ref offset, modeInfo.ColorDepth);
}
for (int i = 0; i < endPointCount; i++)
{
endPoints[i].B = (int)block.Decode(ref offset, modeInfo.ColorDepth);
}
if (modeInfo.AlphaDepth != 0)
{
for (int i = 0; i < endPointCount; i++)
{
endPoints[i].A = (int)block.Decode(ref offset, modeInfo.AlphaDepth);
}
}
for (int i = 0; i < modeInfo.PBits; i++)
{
pValues[i] = (byte)block.Decode(ref offset, 1);
}
for (int i = 0; i < endPointCount; i++)
{
int pBit = -1;
if (modeInfo.PBits != 0)
{
int pIndex = (i * modeInfo.PBits) / endPointCount;
pBit = pValues[pIndex];
}
Unquantize(ref endPoints[i], modeInfo.ColorDepth, modeInfo.AlphaDepth, pBit);
}
byte[] partitionTable = BC67Tables.PartitionTable[modeInfo.SubsetCount - 1][partition];
byte[] fixUpTable = BC67Tables.FixUpIndices[modeInfo.SubsetCount - 1][partition];
Span <byte> colorIndices = stackalloc byte[16];
for (int i = 0; i < 16; i++)
{
byte subset = partitionTable[i];
int bitCount = i == fixUpTable[subset] ? modeInfo.ColorIndexBitCount - 1 : modeInfo.ColorIndexBitCount;
colorIndices[i] = (byte)block.Decode(ref offset, bitCount);
Debug.Assert(colorIndices[i] < 16);
}
Span <byte> alphaIndices = stackalloc byte[16];
if (modeInfo.AlphaIndexBitCount != 0)
{
for (int i = 0; i < 16; i++)
{
int bitCount = i != 0 ? modeInfo.AlphaIndexBitCount : modeInfo.AlphaIndexBitCount - 1;
alphaIndices[i] = (byte)block.Decode(ref offset, bitCount);
Debug.Assert(alphaIndices[i] < 16);
}
}
for (int ty = 0; ty < h; ty++)
{
int baseOffs = ty * width;
for (int tx = 0; tx < w; tx++)
{
int i = ty * 4 + tx;
RgbaColor32 color;
byte subset = partitionTable[i];
RgbaColor32 color1 = endPoints[subset * 2];
RgbaColor32 color2 = endPoints[subset * 2 + 1];
if (modeInfo.AlphaIndexBitCount != 0)
{
if (indexMode == 0)
{
color = BC67Utils.Interpolate(color1, color2, colorIndices[i], alphaIndices[i], modeInfo.ColorIndexBitCount, modeInfo.AlphaIndexBitCount);
}
else
{
color = BC67Utils.Interpolate(color1, color2, alphaIndices[i], colorIndices[i], modeInfo.AlphaIndexBitCount, modeInfo.ColorIndexBitCount);
}
}
else
{
color = BC67Utils.Interpolate(color1, color2, colorIndices[i], colorIndices[i], modeInfo.ColorIndexBitCount, modeInfo.ColorIndexBitCount);
}
if (rotation != 0)
{
int a = color.A;
switch (rotation)
{
case 1: color.A = color.R; color.R = a; break;
case 2: color.A = color.G; color.G = a; break;
case 3: color.A = color.B; color.B = a; break;
}
}
RgbaColor8 color8 = color.GetColor8();
output[baseOffs + tx] = color8.ToUInt32();
}
}
}
private static void DecodeBlock(Block block, Span <ulong> output, int w, int h, int width, bool signed)
{
int mode = (int)(block.Low & 3);
if ((mode & 2) != 0)
{
mode = (int)(block.Low & 0x1f);
}
Span <RgbaColor32> endPoints = stackalloc RgbaColor32[4];
int subsetCount = DecodeEndPoints(ref block, endPoints, mode, signed);
if (subsetCount == 0)
{
// Mode is invalid, the spec mandates that hardware fills the block with
// a opaque black color.
for (int ty = 0; ty < h; ty++)
{
int baseOffs = ty * width;
for (int tx = 0; tx < w; tx++)
{
output[baseOffs + tx] = (ulong)HalfOne << 48;
}
}
return;
}
int partition;
int indexBitCount;
ulong indices;
if (subsetCount > 1)
{
partition = (int)((block.High >> 13) & 0x1F);
indexBitCount = 3;
int fixUpIndex = BC67Tables.FixUpIndices[subsetCount - 1][partition][1] * 3;
ulong lowMask = (ulong.MaxValue >> (65 - fixUpIndex)) << 3;
ulong highMask = ulong.MaxValue << (fixUpIndex + 3);
indices = ((block.High >> 16) & highMask) | ((block.High >> 17) & lowMask) | ((block.High >> 18) & 3);
}
else
{
partition = 0;
indexBitCount = 4;
indices = (block.High & ~0xFUL) | ((block.High >> 1) & 7);
}
ulong indexMask = (1UL << indexBitCount) - 1;
for (int ty = 0; ty < h; ty++)
{
int baseOffs = ty * width;
for (int tx = 0; tx < w; tx++)
{
int offs = baseOffs + tx;
int index = (int)(indices & indexMask);
int endPointBase = BC67Tables.PartitionTable[subsetCount - 1][partition][ty * 4 + tx] << 1;
RgbaColor32 color1 = endPoints[endPointBase];
RgbaColor32 color2 = endPoints[endPointBase + 1];
RgbaColor32 color = BC67Utils.Interpolate(color1, color2, index, indexBitCount);
output[offs] =
(ulong)FinishUnquantize(color.R, signed) |
((ulong)FinishUnquantize(color.G, signed) << 16) |
((ulong)FinishUnquantize(color.B, signed) << 32) |
((ulong)HalfOne << 48);
indices >>= indexBitCount;
}
}
}
private static int DecodeEndPoints(ref Block block, Span <RgbaColor32> endPoints, int mode, bool signed)
{
ulong low = block.Low;
ulong high = block.High;
int r0 = 0, g0 = 0, b0 = 0, r1 = 0, g1 = 0, b1 = 0, r2 = 0, g2 = 0, b2 = 0, r3 = 0, g3 = 0, b3 = 0;
int subsetCount;
switch (mode)
{
case 0:
r0 = (int)(low >> 5) & 0x3FF;
g0 = (int)(low >> 15) & 0x3FF;
b0 = (int)(low >> 25) & 0x3FF;
if (signed)
{
r0 = SignExtend(r0, 10);
g0 = SignExtend(g0, 10);
b0 = SignExtend(b0, 10);
}
r1 = r0 + SignExtend((int)(low >> 35), 5);
g1 = g0 + SignExtend((int)(low >> 45), 5);
b1 = b0 + SignExtend((int)(low >> 55), 5);
r2 = r0 + SignExtend((int)(high >> 1), 5);
g2 = g0 + SignExtend((int)(((low << 2) & 0x10) | ((low >> 41) & 0xF)), 5);
b2 = b0 + SignExtend((int)(((low << 1) & 0x10) | ((high << 3) & 0x08) | (low >> 61)), 5);
r3 = r0 + SignExtend((int)(high >> 7), 5);
g3 = g0 + SignExtend((int)(((low >> 36) & 0x10) | ((low >> 51) & 0xF)), 5);
b3 = b0 + SignExtend((int)(
((low) & 0x10) |
((high >> 9) & 0x08) |
((high >> 4) & 0x04) |
((low >> 59) & 0x02) |
((low >> 50) & 0x01)), 5);
r0 = Unquantize(r0, 10, signed);
g0 = Unquantize(g0, 10, signed);
b0 = Unquantize(b0, 10, signed);
r1 = Unquantize(r1 & 0x3FF, 10, signed);
g1 = Unquantize(g1 & 0x3FF, 10, signed);
b1 = Unquantize(b1 & 0x3FF, 10, signed);
r2 = Unquantize(r2 & 0x3FF, 10, signed);
g2 = Unquantize(g2 & 0x3FF, 10, signed);
b2 = Unquantize(b2 & 0x3FF, 10, signed);
r3 = Unquantize(r3 & 0x3FF, 10, signed);
g3 = Unquantize(g3 & 0x3FF, 10, signed);
b3 = Unquantize(b3 & 0x3FF, 10, signed);
subsetCount = 2;
break;
case 1:
r0 = (int)(low >> 5) & 0x7F;
g0 = (int)(low >> 15) & 0x7F;
b0 = (int)(low >> 25) & 0x7F;
if (signed)
{
r0 = SignExtend(r0, 7);
g0 = SignExtend(g0, 7);
b0 = SignExtend(b0, 7);
}
r1 = r0 + SignExtend((int)(low >> 35), 6);
g1 = g0 + SignExtend((int)(low >> 45), 6);
b1 = b0 + SignExtend((int)(low >> 55), 6);
r2 = r0 + SignExtend((int)(high >> 1), 6);
g2 = g0 + SignExtend((int)(((low << 3) & 0x20) | ((low >> 20) & 0x10) | ((low >> 41) & 0x0F)), 6);
b2 = b0 + SignExtend((int)(
((low >> 17) & 0x20) |
((low >> 10) & 0x10) |
((high << 3) & 0x08) |
(low >> 61)), 6);
r3 = r0 + SignExtend((int)(high >> 7), 6);
g3 = g0 + SignExtend((int)(((low << 1) & 0x30) | ((low >> 51) & 0xF)), 6);
b3 = b0 + SignExtend((int)(
((low >> 28) & 0x20) |
((low >> 30) & 0x10) |
((low >> 29) & 0x08) |
((low >> 21) & 0x04) |
((low >> 12) & 0x03)), 6);
r0 = Unquantize(r0, 7, signed);
g0 = Unquantize(g0, 7, signed);
b0 = Unquantize(b0, 7, signed);
r1 = Unquantize(r1 & 0x7F, 7, signed);
g1 = Unquantize(g1 & 0x7F, 7, signed);
b1 = Unquantize(b1 & 0x7F, 7, signed);
r2 = Unquantize(r2 & 0x7F, 7, signed);
g2 = Unquantize(g2 & 0x7F, 7, signed);
b2 = Unquantize(b2 & 0x7F, 7, signed);
r3 = Unquantize(r3 & 0x7F, 7, signed);
g3 = Unquantize(g3 & 0x7F, 7, signed);
b3 = Unquantize(b3 & 0x7F, 7, signed);
subsetCount = 2;
break;
case 2:
r0 = (int)(((low >> 30) & 0x400) | ((low >> 5) & 0x3FF));
g0 = (int)(((low >> 39) & 0x400) | ((low >> 15) & 0x3FF));
b0 = (int)(((low >> 49) & 0x400) | ((low >> 25) & 0x3FF));
if (signed)
{
r0 = SignExtend(r0, 11);
g0 = SignExtend(g0, 11);
b0 = SignExtend(b0, 11);
}
r1 = r0 + SignExtend((int)(low >> 35), 5);
g1 = g0 + SignExtend((int)(low >> 45), 4);
b1 = b0 + SignExtend((int)(low >> 55), 4);
r2 = r0 + SignExtend((int)(high >> 1), 5);
g2 = g0 + SignExtend((int)(low >> 41), 4);
b2 = b0 + SignExtend((int)(((high << 3) & 8) | (low >> 61)), 4);
r3 = r0 + SignExtend((int)(high >> 7), 5);
g3 = g0 + SignExtend((int)(low >> 51), 4);
b3 = b0 + SignExtend((int)(
((high >> 9) & 8) |
((high >> 4) & 4) |
((low >> 59) & 2) |
((low >> 50) & 1)), 4);
r0 = Unquantize(r0, 11, signed);
g0 = Unquantize(g0, 11, signed);
b0 = Unquantize(b0, 11, signed);
r1 = Unquantize(r1 & 0x7FF, 11, signed);
g1 = Unquantize(g1 & 0x7FF, 11, signed);
b1 = Unquantize(b1 & 0x7FF, 11, signed);
r2 = Unquantize(r2 & 0x7FF, 11, signed);
g2 = Unquantize(g2 & 0x7FF, 11, signed);
b2 = Unquantize(b2 & 0x7FF, 11, signed);
r3 = Unquantize(r3 & 0x7FF, 11, signed);
g3 = Unquantize(g3 & 0x7FF, 11, signed);
b3 = Unquantize(b3 & 0x7FF, 11, signed);
subsetCount = 2;
break;
case 3:
r0 = (int)(low >> 5) & 0x3FF;
g0 = (int)(low >> 15) & 0x3FF;
b0 = (int)(low >> 25) & 0x3FF;
r1 = (int)(low >> 35) & 0x3FF;
g1 = (int)(low >> 45) & 0x3FF;
b1 = (int)(((high << 9) & 0x200) | (low >> 55));
if (signed)
{
r0 = SignExtend(r0, 10);
g0 = SignExtend(g0, 10);
b0 = SignExtend(b0, 10);
r1 = SignExtend(r1, 10);
g1 = SignExtend(g1, 10);
b1 = SignExtend(b1, 10);
}
r0 = Unquantize(r0, 10, signed);
g0 = Unquantize(g0, 10, signed);
b0 = Unquantize(b0, 10, signed);
r1 = Unquantize(r1, 10, signed);
g1 = Unquantize(g1, 10, signed);
b1 = Unquantize(b1, 10, signed);
subsetCount = 1;
break;
case 6:
r0 = (int)(((low >> 29) & 0x400) | ((low >> 5) & 0x3FF));
g0 = (int)(((low >> 40) & 0x400) | ((low >> 15) & 0x3FF));
b0 = (int)(((low >> 49) & 0x400) | ((low >> 25) & 0x3FF));
if (signed)
{
r0 = SignExtend(r0, 11);
g0 = SignExtend(g0, 11);
b0 = SignExtend(b0, 11);
}
r1 = r0 + SignExtend((int)(low >> 35), 4);
g1 = g0 + SignExtend((int)(low >> 45), 5);
b1 = b0 + SignExtend((int)(low >> 55), 4);
r2 = r0 + SignExtend((int)(high >> 1), 4);
g2 = g0 + SignExtend((int)(((high >> 7) & 0x10) | ((low >> 41) & 0x0F)), 5);
b2 = b0 + SignExtend((int)(((high << 3) & 0x08) | ((low >> 61))), 4);
r3 = r0 + SignExtend((int)(high >> 7), 4);
g3 = g0 + SignExtend((int)(((low >> 36) & 0x10) | ((low >> 51) & 0x0F)), 5);
b3 = b0 + SignExtend((int)(
((high >> 9) & 8) |
((high >> 4) & 4) |
((low >> 59) & 2) |
((high >> 5) & 1)), 4);
r0 = Unquantize(r0, 11, signed);
g0 = Unquantize(g0, 11, signed);
b0 = Unquantize(b0, 11, signed);
r1 = Unquantize(r1 & 0x7FF, 11, signed);
g1 = Unquantize(g1 & 0x7FF, 11, signed);
b1 = Unquantize(b1 & 0x7FF, 11, signed);
r2 = Unquantize(r2 & 0x7FF, 11, signed);
g2 = Unquantize(g2 & 0x7FF, 11, signed);
b2 = Unquantize(b2 & 0x7FF, 11, signed);
r3 = Unquantize(r3 & 0x7FF, 11, signed);
g3 = Unquantize(g3 & 0x7FF, 11, signed);
b3 = Unquantize(b3 & 0x7FF, 11, signed);
subsetCount = 2;
break;
case 7:
r0 = (int)(((low >> 34) & 0x400) | ((low >> 5) & 0x3FF));
g0 = (int)(((low >> 44) & 0x400) | ((low >> 15) & 0x3FF));
b0 = (int)(((high << 10) & 0x400) | ((low >> 25) & 0x3FF));
if (signed)
{
r0 = SignExtend(r0, 11);
g0 = SignExtend(g0, 11);
b0 = SignExtend(b0, 11);
}
r1 = (r0 + SignExtend((int)(low >> 35), 9)) & 0x7FF;
g1 = (g0 + SignExtend((int)(low >> 45), 9)) & 0x7FF;
b1 = (b0 + SignExtend((int)(low >> 55), 9)) & 0x7FF;
r0 = Unquantize(r0, 11, signed);
g0 = Unquantize(g0, 11, signed);
b0 = Unquantize(b0, 11, signed);
r1 = Unquantize(r1, 11, signed);
g1 = Unquantize(g1, 11, signed);
b1 = Unquantize(b1, 11, signed);
subsetCount = 1;
break;
case 10:
r0 = (int)(((low >> 29) & 0x400) | ((low >> 5) & 0x3FF));
g0 = (int)(((low >> 39) & 0x400) | ((low >> 15) & 0x3FF));
b0 = (int)(((low >> 50) & 0x400) | ((low >> 25) & 0x3FF));
if (signed)
{
r0 = SignExtend(r0, 11);
g0 = SignExtend(g0, 11);
b0 = SignExtend(b0, 11);
}
r1 = r0 + SignExtend((int)(low >> 35), 4);
g1 = g0 + SignExtend((int)(low >> 45), 4);
b1 = b0 + SignExtend((int)(low >> 55), 5);
r2 = r0 + SignExtend((int)(high >> 1), 4);
g2 = g0 + SignExtend((int)(low >> 41), 4);
b2 = b0 + SignExtend((int)(((low >> 36) & 0x10) | ((high << 3) & 8) | (low >> 61)), 5);
r3 = r0 + SignExtend((int)(high >> 7), 4);
g3 = g0 + SignExtend((int)(low >> 51), 4);
b3 = b0 + SignExtend((int)(
((high >> 7) & 0x10) |
((high >> 9) & 0x08) |
((high >> 4) & 0x06) |
((low >> 50) & 0x01)), 5);
r0 = Unquantize(r0, 11, signed);
g0 = Unquantize(g0, 11, signed);
b0 = Unquantize(b0, 11, signed);
r1 = Unquantize(r1 & 0x7FF, 11, signed);
g1 = Unquantize(g1 & 0x7FF, 11, signed);
b1 = Unquantize(b1 & 0x7FF, 11, signed);
r2 = Unquantize(r2 & 0x7FF, 11, signed);
g2 = Unquantize(g2 & 0x7FF, 11, signed);
b2 = Unquantize(b2 & 0x7FF, 11, signed);
r3 = Unquantize(r3 & 0x7FF, 11, signed);
g3 = Unquantize(g3 & 0x7FF, 11, signed);
b3 = Unquantize(b3 & 0x7FF, 11, signed);
subsetCount = 2;
break;
case 11:
r0 = (int)(((low >> 32) & 0x800) | ((low >> 34) & 0x400) | ((low >> 5) & 0x3FF));
g0 = (int)(((low >> 42) & 0x800) | ((low >> 44) & 0x400) | ((low >> 15) & 0x3FF));
b0 = (int)(((low >> 52) & 0x800) | ((high << 10) & 0x400) | ((low >> 25) & 0x3FF));
if (signed)
{
r0 = SignExtend(r0, 12);
g0 = SignExtend(g0, 12);
b0 = SignExtend(b0, 12);
}
r1 = (r0 + SignExtend((int)(low >> 35), 8)) & 0xFFF;
g1 = (g0 + SignExtend((int)(low >> 45), 8)) & 0xFFF;
b1 = (b0 + SignExtend((int)(low >> 55), 8)) & 0xFFF;
r0 = Unquantize(r0, 12, signed);
g0 = Unquantize(g0, 12, signed);
b0 = Unquantize(b0, 12, signed);
r1 = Unquantize(r1, 12, signed);
g1 = Unquantize(g1, 12, signed);
b1 = Unquantize(b1, 12, signed);
subsetCount = 1;
break;
case 14:
r0 = (int)(low >> 5) & 0x1FF;
g0 = (int)(low >> 15) & 0x1FF;
b0 = (int)(low >> 25) & 0x1FF;
if (signed)
{
r0 = SignExtend(r0, 9);
g0 = SignExtend(g0, 9);
b0 = SignExtend(b0, 9);
}
r1 = r0 + SignExtend((int)(low >> 35), 5);
g1 = g0 + SignExtend((int)(low >> 45), 5);
b1 = b0 + SignExtend((int)(low >> 55), 5);
r2 = r0 + SignExtend((int)(high >> 1), 5);
g2 = g0 + SignExtend((int)(((low >> 20) & 0x10) | ((low >> 41) & 0xF)), 5);
b2 = b0 + SignExtend((int)(((low >> 10) & 0x10) | ((high << 3) & 8) | (low >> 61)), 5);
r3 = r0 + SignExtend((int)(high >> 7), 5);
g3 = g0 + SignExtend((int)(((low >> 36) & 0x10) | ((low >> 51) & 0xF)), 5);
b3 = b0 + SignExtend((int)(
((low >> 30) & 0x10) |
((high >> 9) & 0x08) |
((high >> 4) & 0x04) |
((low >> 59) & 0x02) |
((low >> 50) & 0x01)), 5);
r0 = Unquantize(r0, 9, signed);
g0 = Unquantize(g0, 9, signed);
b0 = Unquantize(b0, 9, signed);
r1 = Unquantize(r1 & 0x1FF, 9, signed);
g1 = Unquantize(g1 & 0x1FF, 9, signed);
b1 = Unquantize(b1 & 0x1FF, 9, signed);
r2 = Unquantize(r2 & 0x1FF, 9, signed);
g2 = Unquantize(g2 & 0x1FF, 9, signed);
b2 = Unquantize(b2 & 0x1FF, 9, signed);
r3 = Unquantize(r3 & 0x1FF, 9, signed);
g3 = Unquantize(g3 & 0x1FF, 9, signed);
b3 = Unquantize(b3 & 0x1FF, 9, signed);
subsetCount = 2;
break;
case 15:
r0 = (BitReverse6((int)(low >> 39) & 0x3F) << 10) | ((int)(low >> 5) & 0x3FF);
g0 = (BitReverse6((int)(low >> 49) & 0x3F) << 10) | ((int)(low >> 15) & 0x3FF);
b0 = ((BitReverse6((int)(low >> 59)) | (int)(high & 1)) << 10) | ((int)(low >> 25) & 0x3FF);
if (signed)
{
r0 = SignExtend(r0, 16);
g0 = SignExtend(g0, 16);
b0 = SignExtend(b0, 16);
}
r1 = (r0 + SignExtend((int)(low >> 35), 4)) & 0xFFFF;
g1 = (g0 + SignExtend((int)(low >> 45), 4)) & 0xFFFF;
b1 = (b0 + SignExtend((int)(low >> 55), 4)) & 0xFFFF;
subsetCount = 1;
break;
case 18:
r0 = (int)(low >> 5) & 0xFF;
g0 = (int)(low >> 15) & 0xFF;
b0 = (int)(low >> 25) & 0xFF;
if (signed)
{
r0 = SignExtend(r0, 8);
g0 = SignExtend(g0, 8);
b0 = SignExtend(b0, 8);
}
r1 = r0 + SignExtend((int)(low >> 35), 6);
g1 = g0 + SignExtend((int)(low >> 45), 5);
b1 = b0 + SignExtend((int)(low >> 55), 5);
r2 = r0 + SignExtend((int)(high >> 1), 6);
g2 = g0 + SignExtend((int)(((low >> 20) & 0x10) | ((low >> 41) & 0xF)), 5);
b2 = b0 + SignExtend((int)(((low >> 10) & 0x10) | ((high << 3) & 8) | (low >> 61)), 5);
r3 = r0 + SignExtend((int)(high >> 7), 6);
g3 = g0 + SignExtend((int)(((low >> 9) & 0x10) | ((low >> 51) & 0xF)), 5);
b3 = b0 + SignExtend((int)(
((low >> 30) & 0x18) |
((low >> 21) & 0x04) |
((low >> 59) & 0x02) |
((low >> 50) & 0x01)), 5);
r0 = Unquantize(r0, 8, signed);
g0 = Unquantize(g0, 8, signed);
b0 = Unquantize(b0, 8, signed);
r1 = Unquantize(r1 & 0xFF, 8, signed);
g1 = Unquantize(g1 & 0xFF, 8, signed);
b1 = Unquantize(b1 & 0xFF, 8, signed);
r2 = Unquantize(r2 & 0xFF, 8, signed);
g2 = Unquantize(g2 & 0xFF, 8, signed);
b2 = Unquantize(b2 & 0xFF, 8, signed);
r3 = Unquantize(r3 & 0xFF, 8, signed);
g3 = Unquantize(g3 & 0xFF, 8, signed);
b3 = Unquantize(b3 & 0xFF, 8, signed);
subsetCount = 2;
break;
case 22:
r0 = (int)(low >> 5) & 0xFF;
g0 = (int)(low >> 15) & 0xFF;
b0 = (int)(low >> 25) & 0xFF;
if (signed)
{
r0 = SignExtend(r0, 8);
g0 = SignExtend(g0, 8);
b0 = SignExtend(b0, 8);
}
r1 = r0 + SignExtend((int)(low >> 35), 5);
g1 = g0 + SignExtend((int)(low >> 45), 6);
b1 = b0 + SignExtend((int)(low >> 55), 5);
r2 = r0 + SignExtend((int)(high >> 1), 5);
g2 = g0 + SignExtend((int)(((low >> 18) & 0x20) | ((low >> 20) & 0x10) | ((low >> 41) & 0xF)), 6);
b2 = b0 + SignExtend((int)(((low >> 10) & 0x10) | ((high << 3) & 0x08) | (low >> 61)), 5);
r3 = r0 + SignExtend((int)(high >> 7), 5);
g3 = g0 + SignExtend((int)(((low >> 28) & 0x20) | ((low >> 36) & 0x10) | ((low >> 51) & 0x0F)), 6);
b3 = b0 + SignExtend((int)(
((low >> 30) & 0x10) |
((high >> 9) & 0x08) |
((high >> 4) & 0x04) |
((low >> 59) & 0x02) |
((low >> 13) & 0x01)), 5);
r0 = Unquantize(r0, 8, signed);
g0 = Unquantize(g0, 8, signed);
b0 = Unquantize(b0, 8, signed);
r1 = Unquantize(r1 & 0xFF, 8, signed);
g1 = Unquantize(g1 & 0xFF, 8, signed);
b1 = Unquantize(b1 & 0xFF, 8, signed);
r2 = Unquantize(r2 & 0xFF, 8, signed);
g2 = Unquantize(g2 & 0xFF, 8, signed);
b2 = Unquantize(b2 & 0xFF, 8, signed);
r3 = Unquantize(r3 & 0xFF, 8, signed);
g3 = Unquantize(g3 & 0xFF, 8, signed);
b3 = Unquantize(b3 & 0xFF, 8, signed);
subsetCount = 2;
break;
case 26:
r0 = (int)(low >> 5) & 0xFF;
g0 = (int)(low >> 15) & 0xFF;
b0 = (int)(low >> 25) & 0xFF;
if (signed)
{
r0 = SignExtend(r0, 8);
g0 = SignExtend(g0, 8);
b0 = SignExtend(b0, 8);
}
r1 = r0 + SignExtend((int)(low >> 35), 5);
g1 = g0 + SignExtend((int)(low >> 45), 5);
b1 = b0 + SignExtend((int)(low >> 55), 6);
r2 = r0 + SignExtend((int)(high >> 1), 5);
g2 = g0 + SignExtend((int)(((low >> 20) & 0x10) | ((low >> 41) & 0xF)), 5);
b2 = b0 + SignExtend((int)(
((low >> 18) & 0x20) |
((low >> 10) & 0x10) |
((high << 3) & 0x08) |
(low >> 61)), 6);
r3 = r0 + SignExtend((int)(high >> 7), 5);
g3 = g0 + SignExtend((int)(((low >> 36) & 0x10) | ((low >> 51) & 0xF)), 5);
b3 = b0 + SignExtend((int)(
((low >> 28) & 0x20) |
((low >> 30) & 0x10) |
((high >> 9) & 0x08) |
((high >> 4) & 0x04) |
((low >> 12) & 0x02) |
((low >> 50) & 0x01)), 6);
r0 = Unquantize(r0, 8, signed);
g0 = Unquantize(g0, 8, signed);
b0 = Unquantize(b0, 8, signed);
r1 = Unquantize(r1 & 0xFF, 8, signed);
g1 = Unquantize(g1 & 0xFF, 8, signed);
b1 = Unquantize(b1 & 0xFF, 8, signed);
r2 = Unquantize(r2 & 0xFF, 8, signed);
g2 = Unquantize(g2 & 0xFF, 8, signed);
b2 = Unquantize(b2 & 0xFF, 8, signed);
r3 = Unquantize(r3 & 0xFF, 8, signed);
g3 = Unquantize(g3 & 0xFF, 8, signed);
b3 = Unquantize(b3 & 0xFF, 8, signed);
subsetCount = 2;
break;
case 30:
r0 = (int)(low >> 5) & 0x3F;
g0 = (int)(low >> 15) & 0x3F;
b0 = (int)(low >> 25) & 0x3F;
r1 = (int)(low >> 35) & 0x3F;
g1 = (int)(low >> 45) & 0x3F;
b1 = (int)(low >> 55) & 0x3F;
r2 = (int)(high >> 1) & 0x3F;
g2 = (int)(((low >> 16) & 0x20) | ((low >> 20) & 0x10) | ((low >> 41) & 0xF));
b2 = (int)(((low >> 17) & 0x20) | ((low >> 10) & 0x10) | ((high << 3) & 0x08) | (low >> 61));
r3 = (int)(high >> 7) & 0x3F;
g3 = (int)(((low >> 26) & 0x20) | ((low >> 7) & 0x10) | ((low >> 51) & 0xF));
b3 = (int)(
((low >> 28) & 0x20) |
((low >> 30) & 0x10) |
((low >> 29) & 0x08) |
((low >> 21) & 0x04) |
((low >> 12) & 0x03));
if (signed)
{
r0 = SignExtend(r0, 6);
g0 = SignExtend(g0, 6);
b0 = SignExtend(b0, 6);
r1 = SignExtend(r1, 6);
g1 = SignExtend(g1, 6);
b1 = SignExtend(b1, 6);
r2 = SignExtend(r2, 6);
g2 = SignExtend(g2, 6);
b2 = SignExtend(b2, 6);
r3 = SignExtend(r3, 6);
g3 = SignExtend(g3, 6);
b3 = SignExtend(b3, 6);
}
r0 = Unquantize(r0, 6, signed);
g0 = Unquantize(g0, 6, signed);
b0 = Unquantize(b0, 6, signed);
r1 = Unquantize(r1, 6, signed);
g1 = Unquantize(g1, 6, signed);
b1 = Unquantize(b1, 6, signed);
r2 = Unquantize(r2, 6, signed);
g2 = Unquantize(g2, 6, signed);
b2 = Unquantize(b2, 6, signed);
r3 = Unquantize(r3, 6, signed);
g3 = Unquantize(g3, 6, signed);
b3 = Unquantize(b3, 6, signed);
subsetCount = 2;
break;
default:
subsetCount = 0;
break;
}
if (subsetCount > 0)
{
endPoints[0] = new RgbaColor32(r0, g0, b0, HalfOne);
endPoints[1] = new RgbaColor32(r1, g1, b1, HalfOne);
if (subsetCount > 1)
{
endPoints[2] = new RgbaColor32(r2, g2, b2, HalfOne);
endPoints[3] = new RgbaColor32(r3, g3, b3, HalfOne);
}
}
return(subsetCount);
}
