diff options
Diffstat (limited to 'src/modified_gamma_transfer_function.cc')
| -rw-r--r-- | src/modified_gamma_transfer_function.cc | 26 |
1 files changed, 18 insertions, 8 deletions
diff --git a/src/modified_gamma_transfer_function.cc b/src/modified_gamma_transfer_function.cc index bb388689..039e9284 100644 --- a/src/modified_gamma_transfer_function.cc +++ b/src/modified_gamma_transfer_function.cc @@ -1,5 +1,5 @@ /* - Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net> + Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net> This file is part of libdcp. @@ -31,14 +31,22 @@ files in the program, then also delete it here. */ + +/** @file src/modified_gamma_transfer_function.cc + * @brief ModifiedGammaTransferFunction class + */ + + #include "modified_gamma_transfer_function.h" #include <cmath> + using std::pow; using std::shared_ptr; using std::dynamic_pointer_cast; using namespace dcp; + ModifiedGammaTransferFunction::ModifiedGammaTransferFunction (double power, double threshold, double A, double B) : _power (power) , _threshold (threshold) @@ -48,6 +56,7 @@ ModifiedGammaTransferFunction::ModifiedGammaTransferFunction (double power, doub } + double * ModifiedGammaTransferFunction::make_lut (int bit_depth, bool inverse) const { @@ -56,7 +65,7 @@ ModifiedGammaTransferFunction::make_lut (int bit_depth, bool inverse) const if (inverse) { double const threshold = _threshold / _B; for (int i = 0; i < bit_length; ++i) { - double const p = static_cast<double> (i) / (bit_length - 1); + double const p = static_cast<double>(i) / (bit_length - 1); if (p > threshold) { lut[i] = (1 + _A) * pow (p, 1 / _power) - _A; } else { @@ -65,7 +74,7 @@ ModifiedGammaTransferFunction::make_lut (int bit_depth, bool inverse) const } } else { for (int i = 0; i < bit_length; ++i) { - double const p = static_cast<double> (i) / (bit_length - 1); + double const p = static_cast<double>(i) / (bit_length - 1); if (p > _threshold) { lut[i] = pow ((p + _A) / (1 + _A), _power); } else { @@ -77,18 +86,19 @@ ModifiedGammaTransferFunction::make_lut (int bit_depth, bool inverse) const return lut; } + bool ModifiedGammaTransferFunction::about_equal (shared_ptr<const TransferFunction> other, double epsilon) const { - shared_ptr<const ModifiedGammaTransferFunction> o = dynamic_pointer_cast<const ModifiedGammaTransferFunction> (other); + auto o = dynamic_pointer_cast<const ModifiedGammaTransferFunction>(other); if (!o) { return false; } return ( - fabs (_power - o->_power) < epsilon && - fabs (_threshold - o->_threshold) < epsilon && - fabs (_A - o->_A) < epsilon && - fabs (_B - o->_B) < epsilon + fabs(_power - o->_power) < epsilon && + fabs(_threshold - o->_threshold) < epsilon && + fabs(_A - o->_A) < epsilon && + fabs(_B - o->_B) < epsilon ); } |