private void Fill()
{
ReadOnlySpan <byte> buffer = _buffer.AsSpan();
ReadOnlySpan <byte> bufferStart = buffer;
ulong value = Value;
int count = Count;
ulong bytesLeft = (ulong)buffer.Length;
ulong bitsLeft = bytesLeft * 8;
int shift = BdValueSize - 8 - (count + 8);
if (bitsLeft > BdValueSize)
{
int bits = (shift & unchecked ((int)0xfffffff8)) + 8;
ulong nv;
ulong bigEndianValues = BinaryPrimitives.ReadUInt64BigEndian(buffer);
nv = bigEndianValues >> (BdValueSize - bits);
count += bits;
buffer = buffer.Slice(bits >> 3);
value = Value | (nv << (shift & 0x7));
}
else
{
int bitsOver = shift + 8 - (int)bitsLeft;
int loopEnd = 0;
if (bitsOver >= 0)
{
count += LotsOfBits;
loopEnd = bitsOver;
}
if (bitsOver < 0 || bitsLeft != 0)
{
while (shift >= loopEnd)
{
count += 8;
value |= (ulong)buffer[0] << shift;
buffer = buffer.Slice(1);
shift -= 8;
}
}
}
// NOTE: Variable 'buffer' may not relate to '_buffer' after decryption,
// so we increase '_buffer' by the amount that 'buffer' moved, rather than
// assign 'buffer' to '_buffer'.
_buffer = _buffer.Slice(bufferStart.Length - buffer.Length);
Value = value;
Count = count;
}
internal void InitMacroBlockD(ref MacroBlockD xd, ArrayPtr <int> dqcoeff)
{
int i;
for (i = 0; i < Constants.MaxMbPlane; ++i)
{
xd.Plane[i].DqCoeff = dqcoeff;
xd.AboveContext[i] = AboveContext.Slice(i * 2 * TileInfo.MiColsAlignedToSb(MiCols));
if (i == 0)
{
MemoryUtil.Copy(ref xd.Plane[i].SegDequant, ref YDequant);
}
else
{
MemoryUtil.Copy(ref xd.Plane[i].SegDequant, ref UvDequant);
}
xd.Fc = new Ptr <Vp9EntropyProbs>(ref Fc.Value);
}
xd.AboveSegContext = AboveSegContext;
xd.MiStride = MiStride;
xd.ErrorInfo = new Ptr <InternalErrorInfo>(ref Error);
SetPartitionProbs(ref xd);
}
private static void SetupPredPlanes(
ref Buf2D dst,
ArrayPtr <byte> src,
int stride,
int miRow,
int miCol,
Ptr <ScaleFactors> scale,
int subsamplingX,
int subsamplingY)
{
int x = (Constants.MiSize * miCol) >> subsamplingX;
int y = (Constants.MiSize * miRow) >> subsamplingY;
dst.Buf = src.Slice(ScaledBufferOffset(x, y, stride, scale));
dst.Stride = stride;
}
private unsafe void DecSetupMi()
{
Mi = Mip.Slice(MiStride + 1);
MiGridVisible = MiGridBase.Slice(MiStride + 1);
MemoryUtil.Fill(MiGridBase.ToPointer(), Ptr <ModeInfo> .Null, MiStride * (MiRows + 1));
}