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calcBlendFactor(): templated, also a small speedup be reordering instructions

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Ingo Weyrich
2020-09-20 15:07:14 +02:00
parent 5b97e0cde3
commit cd63427eca
1 changed files with 3 additions and 12 deletions
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15
rtengine/rt_algo.cc
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@@ -34,23 +34,14 @@
#include "sleef.h" #include "sleef.h"
namespace { namespace {
float calcBlendFactor(float val, float threshold) {
// sigmoid function
// result is in ]0;1] range
// inflexion point is at (x, y) (threshold, 0.5)
return 1.f / (1.f + xexpf(16.f - 16.f * val / threshold));
}
#ifdef __SSE2__ template<typename T>
vfloat calcBlendFactor(vfloat valv, vfloat thresholdv) { T calcBlendFactor(T val, T threshold) {
// sigmoid function // sigmoid function
// result is in ]0;1] range // result is in ]0;1] range
// inflexion point is at (x, y) (threshold, 0.5) // inflexion point is at (x, y) (threshold, 0.5)
const vfloat onev = F2V(1.f); return 1.f / (1.f + xexpf(16.f - (16.f / threshold) * val));
const vfloat c16v = F2V(16.f);
return onev / (onev + xexpf(c16v - c16v * valv / thresholdv));
} }
#endif
float tileAverage(const float * const *data, size_t tileY, size_t tileX, size_t tilesize) { float tileAverage(const float * const *data, size_t tileY, size_t tileX, size_t tilesize) {