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ImProcFunctions::CompressDR(): eliminate eps, #4815

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This commit is contained in:
heckflosse 2018-09-17 23:46:36 +02:00
parent 1a191363ce
commit 2bea84cfa8
1 changed files with 14 additions and 16 deletions
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30
rtengine/ipwavelet.cc
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@ -1427,48 +1427,46 @@ void ImProcFunctions::Eval2 (float ** WavCoeffs_L, int level,
void ImProcFunctions::CompressDR(float *Source, int W_L, int H_L, float Compression, float DetailBoost)
{
constexpr float eps = 0.000001f;
const int n = W_L * H_L;
float temp;
float exponent;
if(DetailBoost > 0.f && DetailBoost < 0.05f ) {
float betemp = expf(-(2.f - DetailBoost + 0.694f)) - 1.f; //0.694 = log(2)
temp = 1.2f * xlogf( -betemp);
temp /= 20.f;
exponent = 1.2f * xlogf( -betemp);
exponent /= 20.f;
} else if(DetailBoost >= 0.05f && DetailBoost < 0.25f ) {
float betemp = expf(-(2.f - DetailBoost + 0.694f)) - 1.f; //0.694 = log(2)
temp = 1.2f * xlogf( -betemp);
temp /= (-75.f * DetailBoost + 23.75f);
exponent = 1.2f * xlogf( -betemp);
exponent /= (-75.f * DetailBoost + 23.75f);
} else if(DetailBoost >= 0.25f) {
float betemp = expf(-(2.f - DetailBoost + 0.694f)) - 1.f; //0.694 = log(2)
temp = 1.2f * xlogf( -betemp);
temp /= (-2.f * DetailBoost + 5.5f);
exponent = 1.2f * xlogf( -betemp);
exponent /= (-2.f * DetailBoost + 5.5f);
} else {
temp = (Compression - 1.0f) / 20.f;
exponent = (Compression - 1.0f) / 20.f;
}
temp += 1.f;
exponent += 1.f;
// now calculate Source = pow(Source, exponent)
#ifdef __SSE2__
#ifdef _OPENMP
#pragma omp parallel
#endif
{
vfloat epsv = F2V(eps);
vfloat tempv = F2V(temp);
vfloat exponentv = F2V(exponent);
#ifdef _OPENMP
#pragma omp for
#endif
for(int i = 0; i < n - 3; i += 4) {
STVFU(Source[i], xexpf(xlogf(LVFU(Source[i]) + epsv) * tempv) - epsv);
STVFU(Source[i], xexpf(xlogf(LVFU(Source[i])) * exponentv));
}
}
for(int i = n - (n % 4); i < n; i++) {
Source[i] = xexpf(xlogf(Source[i] + eps) * temp) - eps;
Source[i] = xexpf(xlogf(Source[i]) * exponent);
}
#else
@ -1477,7 +1475,7 @@ void ImProcFunctions::CompressDR(float *Source, int W_L, int H_L, float Compress
#endif
for(int i = 0; i < n; i++) {
Source[i] = xexpf(xlogf(Source[i] + eps) * temp) - eps;
Source[i] = xexpf(xlogf(Source[i]) * exponent);
}
#endif