+/*
+ Copyright (C) 2023 Carl Hetherington <cth@carlh.net>
+
+ This file is part of DCP-o-matic.
+
+ DCP-o-matic 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.
+
+ DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
+
+*/
+
+
+#include "dcpomatic_assert.h"
+
+
+/** Comparator to allow dcpomatic::Font::Content to be compared for use in a map */
+struct FontComparator
+{
+ bool operator()(dcpomatic::Font::Content const& a, dcpomatic::Font::Content const& b) const {
+ auto const a_has_file = static_cast<bool>(a.file);
+ auto const b_has_file = static_cast<bool>(b.file);
+ auto const a_has_data = static_cast<bool>(a.data);
+ auto const b_has_data = static_cast<bool>(b.data);
+
+ if (!a_has_file && !a_has_data && !b_has_file && !b_has_data) {
+ /* Neither font has any font data: a == b */
+ return false;
+ } else if (!a_has_file && !a_has_data) {
+ /* Fonts with no data are the "lowest": a < b */
+ return true;
+ } else if (!b_has_file && !b_has_data) {
+ /* ... so here b < a */
+ return false;
+ } else if (a_has_file && !b_has_file) {
+ /* Fonts with file are lower than fonts with data: a < b */
+ return true;
+ } else if (!a_has_file && b_has_file) {
+ /* ... so here b < a */
+ return false;
+ } else if (a_has_file && b_has_file) {
+ /* Compared as "equals" */
+ return a.file->string() < b.file->string();
+ } else if (a_has_data && b_has_data) {
+ /* Compared as "equals" */
+ auto const a_size = a.data->size();
+ auto const b_size = b.data->size();
+ if (a_size != b_size) {
+ return a_size < b_size;
+ }
+ return memcmp(a.data->data(), b.data->data(), a_size) < 0;
+ }
+
+ /* Should never get here */
+ DCPOMATIC_ASSERT(false);
+ return false;
+ };
+};
+
+