Make the Brush node store its cache as internal #[data] state instead of a serialized node input

Author: Keavon

editor/src/messages/portfolio/document/document_message_handler.rs

@@ -1760,7 +1760,12 @@ impl DocumentMessageHandler {
 	}
 
 	pub fn deserialize_document(serialized_content: &str) -> Result<Self, EditorError> {
-		let document_message_handler = serde_json::from_str::<DocumentMessageHandler>(serialized_content)
+		// Walk the document JSON and rewrite any `TaggedValue` variants that have been removed since being released as `"None"` so the document still deserializes.
+		// `migrate_node` then drops the resulting orphan node inputs so the value never reaches graph execution.
+		let mut json_value: serde_json::Value = serde_json::from_str(serialized_content).map_err(|e| EditorError::DocumentDeserialization(e.to_string()))?;
+		graph_craft::document::value::TaggedValue::scrub_removed_variants_from_json(&mut json_value);
+
+		let document_message_handler = serde_json::from_value::<DocumentMessageHandler>(json_value.clone())
 			.or_else(|e| {
 				log::warn!("Failed to directly load document with the following error: {e}. Trying old DocumentMessageHandler.");
 				// TODO: Eventually remove this document upgrade code
@@ -1799,7 +1804,7 @@ impl DocumentMessageHandler {
 					pub snapping_state: SnappingState,
 				}
 
-				serde_json::from_str::<OldDocumentMessageHandler>(serialized_content).map(|old_message_handler| DocumentMessageHandler {
+				serde_json::from_value::<OldDocumentMessageHandler>(json_value).map(|old_message_handler| DocumentMessageHandler {
 					network_interface: NodeNetworkInterface::from_old_network(old_message_handler.network),
 					collapsed: old_message_handler.collapsed,
 					commit_hash: old_message_handler.commit_hash,

editor/src/messages/portfolio/document_migration.rs

@@ -1622,16 +1622,27 @@ fn migrate_node(node_id: &NodeId, node: &DocumentNode, network_path: &[NodeId],
 		document.network_interface.set_input(&InputConnector::node(*node_id, 1), old_inputs[1].clone(), network_path);
 	}
 
+	// Old shape: [background, bounds, trace, cache]. Both "bounds" (input 1) and "cache" (input 3) are dropped, and "cache" is now stored as
+	// internal node state via `#[data]` on the brush node, so it is not a node input at all in the new shape.
 	if reference == DefinitionIdentifier::ProtoNode(graphene_std::brush::brush::brush::IDENTIFIER) && inputs_count == 4 {
 		let mut node_template = resolve_document_node_type(&reference)?.default_node_template();
 		document.network_interface.replace_implementation(node_id, network_path, &mut node_template);
 
 		let old_inputs = document.network_interface.replace_inputs(node_id, network_path, &mut node_template)?;
 
 		document.network_interface.set_input(&InputConnector::node(*node_id, 0), old_inputs[0].clone(), network_path);
-		// We have removed the second input ("bounds"), so we don't add index 1 and we shift the rest of the inputs down by one
 		document.network_interface.set_input(&InputConnector::node(*node_id, 1), old_inputs[2].clone(), network_path);
-		document.network_interface.set_input(&InputConnector::node(*node_id, 2), old_inputs[3].clone(), network_path);
+	}
+
+	// Old shape: [background, trace, cache]. The "cache" input is dropped because the brush node now stores its cache as internal `#[data]` state.
+	if reference == DefinitionIdentifier::ProtoNode(graphene_std::brush::brush::brush::IDENTIFIER) && inputs_count == 3 {
+		let mut node_template = resolve_document_node_type(&reference)?.default_node_template();
+		document.network_interface.replace_implementation(node_id, network_path, &mut node_template);
+
+		let old_inputs = document.network_interface.replace_inputs(node_id, network_path, &mut node_template)?;
+
+		document.network_interface.set_input(&InputConnector::node(*node_id, 0), old_inputs[0].clone(), network_path);
+		document.network_interface.set_input(&InputConnector::node(*node_id, 1), old_inputs[1].clone(), network_path);
 	}
 
 	if reference == DefinitionIdentifier::ProtoNode(ProtoNodeIdentifier::new("graphene_core::vector::RemoveHandlesNode")) {

node-graph/graph-craft/src/document/value.rs

@@ -1,7 +1,6 @@
 use super::DocumentNode;
 use crate::application_io::PlatformEditorApi;
 use crate::proto::{Any as DAny, FutureAny};
-use brush_nodes::brush_cache::BrushCache;
 use brush_nodes::brush_stroke::BrushStroke;
 use core_types::table::Table;
 use core_types::transform::Footprint;
@@ -39,7 +38,7 @@ macro_rules! tagged_value {
 			$( $(#[$meta] ) *$identifier( $ty ), )*
 			RenderOutput(RenderOutput),
 			#[serde(skip)]
-			EditorApi(Arc<PlatformEditorApi>)
+			EditorApi(Arc<PlatformEditorApi>),
 		}
 
 		impl CacheHash for TaggedValue {
@@ -79,7 +78,7 @@ macro_rules! tagged_value {
 					Self::None => concrete!(()),
 					$( Self::$identifier(_) => concrete!($ty), )*
 					Self::RenderOutput(_) => concrete!(RenderOutput),
-					Self::EditorApi(_) => concrete!(&PlatformEditorApi)
+					Self::EditorApi(_) => concrete!(&PlatformEditorApi),
 				}
 			}
 			/// Attempts to downcast the dynamic type to a tagged value
@@ -211,7 +210,6 @@ tagged_value! {
 	Stroke(Stroke),
 	Gradient(Gradient),
 	Font(Font),
-	BrushCache(BrushCache),
 	DocumentNode(DocumentNode),
 	ContextFeatures(ContextFeatures),
 	Curve(Curve),
@@ -412,6 +410,35 @@ impl TaggedValue {
 			_ => panic!("Passed value is not of type u32"),
 		}
 	}
+
+	/// Walks a JSON document tree and replaces any externally-tagged `TaggedValue` whose discriminant is in `REMOVED_VARIANTS` with the unit variant `"None"`.
+	/// Lets documents written before a variant was removed continue to deserialize. The document migration step then removes any orphan node inputs that result.
+	#[cfg(feature = "loading")]
+	pub fn scrub_removed_variants_from_json(value: &mut serde_json::Value) {
+		// Names of `TaggedValue` variants that have been removed since being released. Any object of the form `{"<name>": <payload>}` is rewritten to `"None"` on load.
+		const REMOVED_VARIANTS: &[&str] = &["BrushCache"];
+
+		match value {
+			serde_json::Value::Object(map) => {
+				if map.len() == 1
+					&& let Some(key) = map.keys().next()
+					&& REMOVED_VARIANTS.contains(&key.as_str())
+				{
+					*value = serde_json::Value::String("None".to_string());
+					return;
+				}
+				for child in map.values_mut() {
+					Self::scrub_removed_variants_from_json(child);
+				}
+			}
+			serde_json::Value::Array(array) => {
+				for child in array {
+					Self::scrub_removed_variants_from_json(child);
+				}
+			}
+			_ => {}
+		}
+	}
 }
 
 impl Display for TaggedValue {
@@ -518,3 +545,35 @@ impl CacheHash for RenderOutput {
 		self.data.cache_hash(state);
 	}
 }
+
+#[cfg(all(test, feature = "loading"))]
+mod tests {
+	use super::*;
+
+	#[test]
+	fn scrub_replaces_removed_variant_with_none_unit() {
+		let mut value = serde_json::json!({
+			"Value": {
+				"tagged_value": { "BrushCache": { "unique_id": 1, "prev_input": [] } },
+				"exposed": false
+			}
+		});
+		TaggedValue::scrub_removed_variants_from_json(&mut value);
+		assert_eq!(value, serde_json::json!({ "Value": { "tagged_value": "None", "exposed": false } }));
+	}
+
+	#[test]
+	fn scrub_leaves_live_variants_unchanged() {
+		let mut value = serde_json::json!({ "Value": { "tagged_value": { "F64": 1.5 }, "exposed": false } });
+		let original = value.clone();
+		TaggedValue::scrub_removed_variants_from_json(&mut value);
+		assert_eq!(value, original);
+	}
+
+	#[test]
+	fn scrub_recurses_through_arrays_and_nested_objects() {
+		let mut value = serde_json::json!([{ "BrushCache": { "any": "payload" } }, { "F32": 0.5 }]);
+		TaggedValue::scrub_removed_variants_from_json(&mut value);
+		assert_eq!(value, serde_json::json!(["None", { "F32": 0.5 }]));
+	}
+}

node-graph/interpreted-executor/src/node_registry.rs

@@ -6,7 +6,6 @@ use graph_craft::document::value::RenderOutput;
 use graph_craft::proto::{NodeConstructor, TypeErasedBox};
 use graphene_std::any::DynAnyNode;
 use graphene_std::application_io::ImageTexture;
-use graphene_std::brush::brush_cache::BrushCache;
 use graphene_std::brush::brush_stroke::BrushStroke;
 use graphene_std::gradient::GradientStops;
 #[cfg(target_family = "wasm")]
@@ -158,7 +157,6 @@ fn node_registry() -> HashMap<ProtoNodeIdentifier, HashMap<NodeIOTypes, NodeCons
 		async_node!(graphene_core::memo::MonitorNode<_, _, _>, input: Context, fn_params: [Context => Graphic]),
 		async_node!(graphene_core::memo::MonitorNode<_, _, _>, input: Context, fn_params: [Context => graphene_std::text::Font]),
 		async_node!(graphene_core::memo::MonitorNode<_, _, _>, input: Context, fn_params: [Context => Table<BrushStroke>]),
-		async_node!(graphene_core::memo::MonitorNode<_, _, _>, input: Context, fn_params: [Context => BrushCache]),
 		async_node!(graphene_core::memo::MonitorNode<_, _, _>, input: Context, fn_params: [Context => DocumentNode]),
 		async_node!(graphene_core::memo::MonitorNode<_, _, _>, input: Context, fn_params: [Context => graphene_std::raster::curve::Curve]),
 		async_node!(graphene_core::memo::MonitorNode<_, _, _>, input: Context, fn_params: [Context => graphene_std::transform::Footprint]),
@@ -246,7 +244,6 @@ fn node_registry() -> HashMap<ProtoNodeIdentifier, HashMap<NodeIOTypes, NodeCons
 		async_node!(graphene_core::memo::MemoizeNode<_, _>, input: Context, fn_params: [Context => graphene_std::vector::style::Gradient]),
 		async_node!(graphene_core::memo::MemoizeNode<_, _>, input: Context, fn_params: [Context => graphene_std::text::Font]),
 		async_node!(graphene_core::memo::MemoizeNode<_, _>, input: Context, fn_params: [Context => Table<BrushStroke>]),
-		async_node!(graphene_core::memo::MemoizeNode<_, _>, input: Context, fn_params: [Context => BrushCache]),
 		async_node!(graphene_core::memo::MemoizeNode<_, _>, input: Context, fn_params: [Context => DocumentNode]),
 		async_node!(graphene_core::memo::MemoizeNode<_, _>, input: Context, fn_params: [Context => graphene_std::ContextFeatures]),
 		async_node!(graphene_core::memo::MemoizeNode<_, _>, input: Context, fn_params: [Context => graphene_std::raster::curve::Curve]),

node-graph/nodes/brush/src/brush.rs

@@ -195,6 +195,7 @@ async fn brush(
 	/// The list of brush stroke paths drawn by the Brush tool, with each including both its coordinates and styles.
 	trace: Table<BrushStroke>,
 	/// Internal cache data used to accelerate rendering of the brush content.
+	#[data]
 	cache: BrushCache,
 ) -> Table<Raster<CPU>> {
 	if background.is_empty() {
@@ -419,6 +420,7 @@ mod test {
 	async fn test_brush_output_size() {
 		let image = brush(
 			(),
+			&BrushCache::default(),
 			Table::new_from_element(Raster::new_cpu(Image::<Color>::default())),
 			Table::new_from_element(BrushStroke {
 				trace: vec![crate::brush_stroke::BrushInputSample { position: DVec2::ZERO }],
@@ -431,7 +433,6 @@ mod test {
 					blend_mode: BlendMode::Normal,
 				},
 			}),
-			BrushCache::default(),
 		)
 		.await;
 		assert_eq!(image.element(0).unwrap().width, 20);

node-graph/nodes/brush/src/brush_cache.rs

@@ -3,7 +3,6 @@ use crate::brush_stroke::BrushStyle;
 use core_types::ATTR_TRANSFORM;
 use core_types::graphene_hash::CacheHashWrapper;
 use core_types::table::TableRow;
-use dyn_any::DynAny;
 use raster_types::CPU;
 use raster_types::Raster;
 use std::collections::HashMap;
@@ -15,25 +14,18 @@ use std::sync::{Arc, Mutex};
 // TODO: This is a temporary hack, be sure to not reuse this when the brush system is replaced/rewritten.
 static NEXT_BRUSH_CACHE_IMPL_ID: AtomicU64 = AtomicU64::new(0);
 
-#[derive(Clone, Debug, DynAny)]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[derive(Clone, Debug)]
 struct BrushCacheImpl {
-	#[cfg_attr(feature = "serde", serde(default = "new_unique_id"))]
 	unique_id: u64,
 	// The full previous input that was cached.
-	#[cfg_attr(feature = "serde", serde(default))]
 	prev_input: Vec<BrushStroke>,
 
 	// The strokes that have been fully processed and blended into the background.
-	#[cfg_attr(feature = "serde", serde(default, deserialize_with = "raster_types::image::migrate_image_frame_row"))]
 	background: TableRow<Raster<CPU>>,
-	#[cfg_attr(feature = "serde", serde(default, deserialize_with = "raster_types::image::migrate_image_frame_row"))]
 	blended_image: TableRow<Raster<CPU>>,
-	#[cfg_attr(feature = "serde", serde(default, deserialize_with = "raster_types::image::migrate_image_frame_row"))]
 	last_stroke_texture: TableRow<Raster<CPU>>,
 
 	// A cache for brush textures.
-	#[cfg_attr(feature = "serde", serde(skip))]
 	brush_texture_cache: HashMap<CacheHashWrapper<BrushStyle>, Raster<CPU>>,
 }
 
@@ -134,8 +126,7 @@ pub struct BrushPlan {
 	pub first_stroke_point_skip: usize,
 }
 
-#[derive(Debug, Default, DynAny)]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[derive(Debug, Default)]
 pub struct BrushCache(Arc<Mutex<BrushCacheImpl>>);
 
 // A bit of a cursed implementation to work around the current node system.