diff options
Diffstat (limited to 'src/gamma_transfer_function.cc')
| -rw-r--r-- | src/gamma_transfer_function.cc | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/src/gamma_transfer_function.cc b/src/gamma_transfer_function.cc index b4aa20f1..9d5ceba4 100644 --- a/src/gamma_transfer_function.cc +++ b/src/gamma_transfer_function.cc @@ -25,27 +25,33 @@ using boost::shared_ptr; using boost::dynamic_pointer_cast; using namespace dcp; -GammaTransferFunction::GammaTransferFunction (float gamma) - : _gamma (gamma) +GammaTransferFunction::GammaTransferFunction (bool inverse, double gamma) + : TransferFunction (inverse) + , _gamma (gamma) { } -float * +double * GammaTransferFunction::make_lut (int bit_depth) const { int const bit_length = pow (2, bit_depth); - float* lut = new float[int(std::pow(2.0f, bit_depth))]; + double* lut = new double[int(std::pow(2.0f, bit_depth))]; + double const gamma = _inverse ? (1 / _gamma) : _gamma; for (int i = 0; i < bit_length; ++i) { - lut[i] = pow(float(i) / (bit_length - 1), _gamma); + lut[i] = pow(double(i) / (bit_length - 1), gamma); } return lut; } bool -GammaTransferFunction::about_equal (shared_ptr<const TransferFunction> other, float epsilon) const +GammaTransferFunction::about_equal (shared_ptr<const TransferFunction> other, double epsilon) const { + if (!TransferFunction::about_equal (other, epsilon)) { + return false; + } + shared_ptr<const GammaTransferFunction> o = dynamic_pointer_cast<const GammaTransferFunction> (other); if (!o) { return false; |