74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/* -*- C++ -*-
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*
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* This file is part of RawTherapee.
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*
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* Copyright 2018 Alberto Griggio <alberto.griggio@gmail.com>
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*
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* RawTherapee is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* RawTherapee is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with RawTherapee. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef _OPENMP
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#include <omp.h>
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#endif
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#include "improcfun.h"
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namespace rtengine {
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void ImProcFunctions::softLight(float *red, float *green, float *blue, int istart, int jstart, int tW, int tH, int TS)
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{
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if (!params->softlight.enabled || !params->softlight.strength) {
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return;
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}
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const float blend = params->softlight.strength / 100.f;
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const float orig = 1.f - blend;
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const auto apply =
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[=](float x) -> float
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{
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if (!OOG(x)) {
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float v = Color::gamma_srgb(x) / MAXVALF;
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// Pegtop's formula from
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// https://en.wikipedia.org/wiki/Blend_modes#Soft_Light
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float v2 = v * v;
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float v22 = v2 * 2.f;
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v = v2 + v22 - v22 * v;
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x = blend * Color::igamma_srgb(v * MAXVALF) + orig * x;
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}
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return x;
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};
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#ifdef _OPENMP
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#pragma omp parallel if (multiThread)
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#endif
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{
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int ti = 0;
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#ifdef _OPENMP
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#pragma omp for
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#endif
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for (int i = istart; i < tH; i++) {
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for (int j = jstart, tj = 0; j < tW; j++, tj++) {
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const int idx = ti * TS + tj;
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red[idx] = apply(red[idx]);
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green[idx] = apply(green[idx]);
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blue[idx] = apply(blue[idx]);
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}
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++ti;
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}
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}
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}
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} // namespace rtengine
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