+
+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 (cxml::NodePtr 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);
+}