+
+
+float
+FontMetrics::height(StringText const& subtitle)
+{
+ return get(subtitle)->second.second;
+}
+
+
+float
+FontMetrics::baseline_to_bottom(StringText const& subtitle)
+{
+ return get(subtitle)->second.first;
+}
+
+
+FontMetrics::Cache::iterator
+FontMetrics::get(StringText const& subtitle)
+{
+ auto id = Identifier(subtitle);
+
+ auto iter = _cache.find(id);
+ if (iter != _cache.end()) {
+ return iter;
+ }
+
+ auto const font_name = setup_font(subtitle.font);
+ auto layout = create_layout();
+ auto copy = subtitle;
+ copy.set_text("Qypjg");
+ setup_layout(layout, font_name, marked_up({copy}, _target_height, 1, font_name));
+ auto ink = layout->get_ink_extents();
+ auto const scale = float(_target_height * Pango::SCALE);
+ return _cache.insert({id, { ink.get_y() / scale, ink.get_height() / scale}}).first;
+}
+
+
+FontMetrics::Identifier::Identifier(StringText const& subtitle)
+ : font(subtitle.font)
+ , size(subtitle.size())
+ , aspect_adjust(subtitle.aspect_adjust())
+{
+
+}
+
+
+bool
+FontMetrics::Identifier::operator<(FontMetrics::Identifier const& other) const
+{
+ if (font != other.font) {
+ return font < other.font;
+ }
+
+ if (size != other.size) {
+ return size < other.size;
+ }
+
+ return aspect_adjust < other.aspect_adjust;
+}
+