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Fattal: remove nondeterminism due to openmp and use a more robust comparison for finding the max luminance

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Addresses #4306 and at least mitigates it
This commit is contained in:
Alberto Griggio 2018-01-14 23:47:13 +01:00
parent dbcfc9d91a
commit 3c50e8ff5b
1 changed files with 18 additions and 24 deletions
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42
rtengine/tmo_fattal02.cc
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@ -1055,8 +1055,9 @@ inline int find_fast_dim (int dim)
{
// as per the FFTW docs:
//
// FFTW is generally best at handling sizes of the form 2a 3b 5c 7d 11e
// 13f, where e+f is either 0 or 1.
// FFTW is generally best at handling sizes of the form
// 2^a 3^b 5^c 7^d 11^e 13^f,
// where e+f is either 0 or 1.
//
// Here, we try to round up to the nearest dim that can be expressed in
// the above form. This is not exhaustive, but should be ok for pictures
@ -1125,39 +1126,32 @@ void ImProcFunctions::ToneMapFattal02 (Imagefloat *rgb)
constexpr float c = 65500.f;
return rgb->r(y, x) < c && rgb->g(y, x) < c && rgb->b(y, x) < c;
};
TMatrix ws = ICCStore::getInstance()->workingSpaceMatrix (params->icm.working);
float max_Y = 0.f;
int max_x = 0, max_y = 0;
#ifdef _OPENMP
#pragma omp parallel if (multiThread)
#endif
{
float max_YThr = 0.f;
int max_xThr = 0, max_yThr = 0;
#ifdef _OPENMP
#pragma omp for schedule(dynamic,16) nowait
#endif
const auto biggerY =
[](float cur_Y, float prev_Y) -> bool
{
if (!prev_Y) {
return true;
}
float e = (cur_Y - prev_Y) / max(cur_Y, prev_Y);
return e >= 0.05;
};
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
Yr (x, y) = std::max (luminance (rgb->r (y, x), rgb->g (y, x), rgb->b (y, x), ws), min_luminance); // clip really black pixels
if (Yr(x, y) > max_YThr && unclipped(y, x)) {
max_YThr = Yr(x, y);
max_xThr = x;
max_yThr = y;
if (biggerY(Yr(x, y), max_Y) && unclipped(y, x)) {
max_Y = Yr(x, y);
max_x = x;
max_y = y;
}
}
}
#ifdef _OPENMP
#pragma omp critical
#endif
if (max_YThr > max_Y) {
max_Y = max_YThr;
max_x = max_xThr;
max_y = max_yThr;
}
}
// median filter on the deep shadows, to avoid boosting noise
// because w2 >= w and h2 >= h, we can use the L buffer as temporary buffer for Median_Denoise()