Restore the layer state operator

OP_setup_layers.py

@@ -161,6 +161,37 @@ class GPEXP_OT_export_infos_for_compo(bpy.types.Operator):
 
         return {"FINISHED"}
 
+
+class GPEXP_OT_restore_layers_state(bpy.types.Operator):
+    bl_idname = "gp.restore_layers_state"
+    bl_label = "Restore Layers State "
+    bl_description = "Restore original state of layers"
+    bl_options = {"REGISTER"} # , "UNDO"
+
+    def execute(self, context):
+        layers_info_path = Path(bpy.data.filepath).parent / 'render' / 'infos.json'
+        if not layers_info_path.exists():
+            self.report({"ERROR"}, 'No Info Found')
+            return {"CANCELLED"}
+        
+        layers_info = json.loads(layers_info_path.read_text(encoding='utf-8'))
+
+        pool = [o for o in context.scene.objects if o.type == 'GPENCIL' and fn.is_valid_name(o.name)]
+        for gp in pool:
+            for layer_name, info in layers_info.items():
+                if gp.name == info['object']:
+                    if not (layer := gp.data.layers.get(layer_name)):
+                        return
+                    
+                    if "opacity" in info:
+                        layer.opacity = info['opacity']
+
+                    if "blend_mode" in info:
+                        layer.blend_mode = info['blend_mode']
+
+        return {"FINISHED"}
+
+
 class GPEXP_OT_layers_state(bpy.types.Operator):
     bl_idname = "gp.layers_state"
     bl_label = "Set Layers State"
@@ -335,6 +366,7 @@ class GPEXP_OT_layers_state(bpy.types.Operator):
 
         return {"FINISHED"}
 
+
 class GPEXP_OT_lower_layers_name(bpy.types.Operator):
     bl_idname = "gp.lower_layers_name"
     bl_label = "Normalize Layers Name"
@@ -643,6 +675,7 @@ classes=(
 GPEXP_OT_auto_number_object,
 GPEXP_OT_lower_layers_name,
 GPEXP_OT_export_infos_for_compo,
+GPEXP_OT_restore_layers_state,
 GPEXP_OT_layers_state,
 GPEXP_OT_check_masks,
 GPEXP_OT_select_layer_in_comp,

ui.py

@@ -274,7 +274,11 @@ class GPEXP_PT_gp_dopesheet_ui(Panel):
         row.operator('gp.auto_number_object', icon='X', text='').delete = True
         col.operator('gp.lower_layers_name', icon='SYNTAX_OFF', text='Rename Lowercase')
         col.operator('gp.export_infos_for_compo', icon='FILE', text='Export Layers Infos') # Not really need, called in Check layers invoke
-        col.operator('gp.layers_state', icon='CHECKMARK', text='Check layers')
+
+        row = layout.row(align=True)
+        row.operator('gp.layers_state', icon='CHECKMARK', text='Check layers')
+        row.operator('gp.restore_layers_state', icon='DECORATE_OVERRIDE', text='')
+
         col.operator('gp.check_masks', icon='MOD_MASK', text='Has Masks')
 
         # row = layout.row()