themes and styles

client/world/style.go

@@ -205,3 +205,30 @@ func (t *StyleTable) AddDerived(baseID StyleID, override StyleOverride) StyleID
 	t.styles[id] = derived
 	return id
 }
+
+// AddStyle stores a fully resolved style as a new StyleID.
+// It defensively copies slice fields.
+func (t *StyleTable) AddStyle(s Style) StyleID {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+
+	id := t.nextID
+	t.nextID++
+
+	if s.StrokeDashes != nil {
+		cp := make([]float64, len(s.StrokeDashes))
+		copy(cp, s.StrokeDashes)
+		s.StrokeDashes = cp
+	}
+
+	t.styles[id] = s
+	return id
+}
+
+// Count returns the number of styles stored in the table.
+// Intended for tests/diagnostics.
+func (t *StyleTable) Count() int {
+	t.mu.RLock()
+	defer t.mu.RUnlock()
+	return len(t.styles)
+}