adds find used ids feature to editor

src/operators/id_editor_find_used_ids.py

@@ -0,0 +1,63 @@
+import bpy
+
+class IDEDITOR_FindUsedIDsOperator(bpy.types.Operator):
+    bl_idname = "id_mask_editor.find_used_ids"
+    bl_label = "Find used colors"
+    bl_description = "Searches the current ID-mask for colors and adds them to the id-list"
+
+    @classmethod
+    def poll(cls, context):
+        obj = context.active_object
+        if obj.type != 'MESH':
+            return False
+
+        if not obj.data:
+            return False
+
+        mesh = obj.data
+        properties = mesh.id_mask_editor_properties
+
+        if not properties.target_attribute:
+            return False
+
+        return True
+
+    def execute(self, context):
+        obj = context.active_object
+
+        old_mode = bpy.context.object.mode
+        if old_mode != "OBJECT":
+            bpy.ops.object.mode_set(mode='OBJECT', toggle=False)
+
+        mesh = obj.data
+        properties = mesh.id_mask_editor_properties
+        color_attribute = mesh.color_attributes.get(properties.target_attribute)
+
+        colors = []
+        for color_data in color_attribute.data:
+            colors.append((color_data.color[0], color_data.color[1], color_data.color[2]))
+
+        i = 0
+        set_colors = set(colors)
+        for color in set_colors:
+            has_color = False
+            for color_id in properties.possible_ids:
+                has_color = (color_id.color.r == color[0] and
+                             color_id.color.g == color[1] and
+                             color_id.color.b == color[2])
+
+                if has_color:
+                    break
+
+            if has_color:
+                continue
+
+            color_identifier = properties.possible_ids.add()
+            color_identifier.color = (color[0], color[1], color[2])
+            color_identifier.name = "Imported ID " + str(i + 1)
+            i += 1
+
+        if old_mode != "OBJECT":
+            bpy.ops.object.mode_set(mode=old_mode, toggle=False)
+
+        return {'FINISHED'}