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Diffstat (limited to 'src/lib/colour_conversion.cc')
| -rw-r--r-- | src/lib/colour_conversion.cc | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/src/lib/colour_conversion.cc b/src/lib/colour_conversion.cc new file mode 100644 index 000000000..ceb302971 --- /dev/null +++ b/src/lib/colour_conversion.cc @@ -0,0 +1,198 @@ +/* + Copyright (C) 2013 Carl Hetherington <cth@carlh.net> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +*/ + +#include <boost/lexical_cast.hpp> +#include <libxml++/libxml++.h> +#include <libdcp/colour_matrix.h> +#include <libcxml/cxml.h> +#include "config.h" +#include "colour_conversion.h" +#include "util.h" + +#include "i18n.h" + +using std::list; +using std::string; +using std::cout; +using std::vector; +using boost::shared_ptr; +using boost::lexical_cast; +using boost::optional; + +ColourConversion::ColourConversion () + : input_gamma (2.4) + , input_gamma_linearised (true) + , matrix (3, 3) + , output_gamma (2.6) +{ + for (int i = 0; i < 3; ++i) { + for (int j = 0; j < 3; ++j) { + matrix (i, j) = libdcp::colour_matrix::srgb_to_xyz[i][j]; + } + } +} + +ColourConversion::ColourConversion (double i, bool il, double const m[3][3], double o) + : input_gamma (i) + , input_gamma_linearised (il) + , matrix (3, 3) + , output_gamma (o) +{ + for (int i = 0; i < 3; ++i) { + for (int j = 0; j < 3; ++j) { + matrix (i, j) = m[i][j]; + } + } +} + +ColourConversion::ColourConversion (shared_ptr<cxml::Node> node) + : matrix (3, 3) +{ + input_gamma = node->number_child<double> ("InputGamma"); + input_gamma_linearised = node->bool_child ("InputGammaLinearised"); + + for (int i = 0; i < 3; ++i) { + for (int j = 0; j < 3; ++j) { + matrix (i, j) = 0; + } + } + + list<shared_ptr<cxml::Node> > m = node->node_children ("Matrix"); + for (list<shared_ptr<cxml::Node> >::iterator i = m.begin(); i != m.end(); ++i) { + int const ti = (*i)->number_attribute<int> ("i"); + int const tj = (*i)->number_attribute<int> ("j"); + matrix(ti, tj) = lexical_cast<double> ((*i)->content ()); + } + + output_gamma = node->number_child<double> ("OutputGamma"); +} + +void +ColourConversion::as_xml (xmlpp::Node* node) const +{ + node->add_child("InputGamma")->add_child_text (lexical_cast<string> (input_gamma)); + node->add_child("InputGammaLinearised")->add_child_text (input_gamma_linearised ? "1" : "0"); + + for (int i = 0; i < 3; ++i) { + for (int j = 0; j < 3; ++j) { + xmlpp::Element* m = node->add_child("Matrix"); + m->set_attribute ("i", lexical_cast<string> (i)); + m->set_attribute ("j", lexical_cast<string> (j)); + m->add_child_text (lexical_cast<string> (matrix (i, j))); + } + } + + node->add_child("OutputGamma")->add_child_text (lexical_cast<string> (output_gamma)); +} + +optional<size_t> +ColourConversion::preset () const +{ + vector<PresetColourConversion> presets = Config::instance()->colour_conversions (); + size_t i = 0; + while (i < presets.size() && (presets[i].conversion != *this)) { + ++i; + } + + if (i >= presets.size ()) { + return optional<size_t> (); + } + + return i; +} + +string +ColourConversion::identifier () const +{ + double numbers[12]; + + int n = 0; + numbers[n++] = input_gamma; + numbers[n++] = input_gamma_linearised; + for (int i = 0; i < 3; ++i) { + for (int j = 0; j < 3; ++j) { + numbers[n++] = matrix (i, j); + } + } + numbers[n++] = output_gamma; + + assert (n == 12); + + return md5_digest (numbers, 12 * sizeof (double)); +} + +PresetColourConversion::PresetColourConversion () + : name (_("Untitled")) +{ + +} + +PresetColourConversion::PresetColourConversion (string n, double i, bool il, double const m[3][3], double o) + : name (n) + , conversion (i, il, m, o) +{ + +} + +PresetColourConversion::PresetColourConversion (shared_ptr<cxml::Node> node) + : conversion (node) +{ + name = node->string_child ("Name"); +} + +void +PresetColourConversion::as_xml (xmlpp::Node* node) const +{ + conversion.as_xml (node); + node->add_child("Name")->add_child_text (name); +} + +static bool +about_equal (double a, double b) +{ + static const double eps = 1e-6; + return fabs (a - b) < eps; +} + +bool +operator== (ColourConversion const & a, ColourConversion const & b) +{ + if ( + !about_equal (a.input_gamma, b.input_gamma) || + a.input_gamma_linearised != b.input_gamma_linearised || + !about_equal (a.output_gamma, b.output_gamma)) { + return false; + } + + for (int i = 0; i < 3; ++i) { + for (int j = 0; j < 3; ++j) { + if (!about_equal (a.matrix (i, j), b.matrix (i, j))) { + return false; + } + } + } + + return true; +} + +bool +operator!= (ColourConversion const & a, ColourConversion const & b) +{ + return !(a == b); +} |