public void FloatingPointDCT_ReferenceImplementation_ForwardThenInverse(int seed, int startAt)
{
var data = Create8x8RandomIntData(-200, 200, seed);
MutableSpan <float> src = new MutableSpan <int>(data).ConvertToFloat32MutableSpan();
MutableSpan <float> dest = new MutableSpan <float>(64);
MutableSpan <float> temp = new MutableSpan <float>(64);
ReferenceImplementations.fDCT2D_llm(src, dest, temp, true);
ReferenceImplementations.iDCT2D_llm(dest, src, temp);
for (int i = startAt; i < 64; i++)
{
float expected = data[i];
float actual = (float)src[i];
Assert.Equal(expected, actual, new ApproximateFloatComparer(2f));
}
}
public void Fdct_FloatingPointReferenceImplementation_IsEquivalentToIntegerImplementation(int seed)
{
MutableSpan <int> intData = Create8x8RandomIntData(-200, 200, seed);
MutableSpan <float> floatSrc = intData.ConvertToFloat32MutableSpan();
ReferenceImplementations.IntegerReferenceDCT.TransformFDCTInplace(intData);
MutableSpan <float> dest = new MutableSpan <float>(64);
MutableSpan <float> temp = new MutableSpan <float>(64);
ReferenceImplementations.fDCT2D_llm(floatSrc, dest, temp, offsetSourceByNeg128: true);
for (int i = 0; i < 64; i++)
{
float expected = intData[i];
float actual = dest[i];
Assert.Equal(expected, actual, new ApproximateFloatComparer(1f));
}
}
