e12c08e8d1
Apply clang format as proposed in T53211. For details on usage and instructions for migrating branches without conflicts, see: https://wiki.blender.org/wiki/Tools/ClangFormat
76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/*
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* Copyright 2011-2015 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __UTIL_MATH_CDF_H__
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#define __UTIL_MATH_CDF_H__
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#include "util/util_algorithm.h"
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#include "util/util_math.h"
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#include "util/util_vector.h"
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CCL_NAMESPACE_BEGIN
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/* Evaluate CDF of a given functor with given range and resolution. */
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template<typename Functor>
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void util_cdf_evaluate(
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const int resolution, const float from, const float to, Functor functor, vector<float> &cdf)
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{
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const int cdf_count = resolution + 1;
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const float range = to - from;
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cdf.resize(cdf_count);
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cdf[0] = 0.0f;
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/* Actual CDF evaluation. */
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for (int i = 0; i < resolution; ++i) {
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float x = from + range * (float)i / (resolution - 1);
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float y = functor(x);
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cdf[i + 1] = cdf[i] + fabsf(y);
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}
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/* Normalize the CDF. */
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for (int i = 0; i <= resolution; i++) {
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cdf[i] /= cdf[resolution];
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}
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}
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/* Invert pre-calculated CDF function. */
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void util_cdf_invert(const int resolution,
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const float from,
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const float to,
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const vector<float> &cdf,
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const bool make_symmetric,
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vector<float> &inv_cdf);
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/* Evaluate inverted CDF of a given functor with given range and resolution. */
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template<typename Functor>
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void util_cdf_inverted(const int resolution,
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const float from,
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const float to,
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Functor functor,
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const bool make_symmetric,
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vector<float> &inv_cdf)
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{
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vector<float> cdf;
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/* There is no much smartness going around lower resolution for the CDF table,
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* this just to match the old code from pixel filter so it all stays exactly
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* the same and no regression tests are failed.
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*/
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util_cdf_evaluate(resolution - 1, from, to, functor, cdf);
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util_cdf_invert(resolution, from, to, cdf, make_symmetric, inv_cdf);
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}
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CCL_NAMESPACE_END
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#endif /* __UTIL_MATH_H_CDF__ */
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