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 TransposeInto()
{
float[] expected = Create8x8FloatData();
ReferenceImplementations.Transpose8x8(expected);
Block8x8F source = new Block8x8F();
source.LoadFrom(Create8x8FloatData());
Block8x8F dest = new Block8x8F();
source.TransposeInto(ref dest);
float[] actual = new float[64];
dest.CopyTo(actual);
Assert.Equal(expected, actual);
}
public void Idct_FloatingPointReferenceImplementation_IsEquivalentToIntegerImplementation(int seed)
{
MutableSpan <int> intData = Create8x8RandomIntData(-200, 200, seed);
MutableSpan <float> floatSrc = intData.ConvertToFloat32MutableSpan();
ReferenceImplementations.IntegerReferenceDCT.TransformIDCTInplace(intData);
MutableSpan <float> dest = new MutableSpan <float>(64);
MutableSpan <float> temp = new MutableSpan <float>(64);
ReferenceImplementations.iDCT2D_llm(floatSrc, dest, temp);
for (int i = 0; i < 64; i++)
{
float expected = intData[i];
float actual = dest[i];
Assert.Equal(expected, actual, new ApproximateFloatComparer(1f));
}
}
public void iDCT2D8x4_RightPart()
{
MutableSpan <float> sourceArray = Create8x8FloatData();
MutableSpan <float> expectedDestArray = new float[64];
ReferenceImplementations.iDCT2D8x4_32f(sourceArray.Slice(4), expectedDestArray.Slice(4));
Block8x8F source = new Block8x8F();
source.LoadFrom(sourceArray);
Block8x8F dest = new Block8x8F();
source.IDCT8x4_RightPart(ref dest);
float[] actualDestArray = new float[64];
dest.CopyTo(actualDestArray);
Print8x8Data(expectedDestArray);
Output.WriteLine("**************");
Print8x8Data(actualDestArray);
Assert.Equal(expectedDestArray.Data, actualDestArray);
}