Downscale Images to document resolution (#1077)

* Add DownscaleNode

* Add lambda (call argument) input type + fix caching

* Add comment explaining Lambda input

* Automatically insert cache node after downscale node

* Implement sparse hashing of images

editor/Cargo.toml

@@ -12,7 +12,10 @@ license = "Apache-2.0"
 
 [features]
 gpu = ["interpreted-executor/gpu", "graphene-std/gpu", "graphene-core/gpu"]
-quantization = ["graphene-std/quantization", "interpreted-executor/quantization"]
+quantization = [
+	"graphene-std/quantization",
+	"interpreted-executor/quantization",
+]
 
 [dependencies]
 log = "0.4"
@@ -22,7 +25,7 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "1.0" }
 graphite-proc-macros = { path = "../proc-macros" }
 bezier-rs = { path = "../libraries/bezier-rs" }
-glam = { version="0.22", features = ["serde"] }
+glam = { version = "0.22", features = ["serde"] }
 kurbo = { git = "https://github.com/linebender/kurbo.git", features = [
 	"serde",
 ] }
@@ -32,7 +35,10 @@ once_cell = "1.13.0" # Remove when `core::cell::OnceCell` is stabilized (<https:
 specta.workspace = true
 
 # Node graph
-image = { version = "0.24", default-features = false, features = ["bmp"] }
+image = { version = "0.24", default-features = false, features = [
+	"bmp",
+	"png",
+] }
 graph-craft = { path = "../node-graph/graph-craft" }
 interpreted-executor = { path = "../node-graph/interpreted-executor" }
 borrow_stack = { path = "../node-graph/borrow_stack" }

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

@@ -612,6 +612,9 @@ impl MessageHandler<DocumentMessage, (u64, &InputPreprocessorMessageHandler, &Pe
 				let center_in_viewport = DAffine2::from_translation(viewport_location - ipp.viewport_bounds.top_left);
 				let center_in_viewport_layerspace = to_parent_folder.inverse() * center_in_viewport;
 
+				// Scale the image to fit into a 512x512 box
+				let image_size = image_size / DVec2::splat((image_size.max_element() / 512.).max(1.));
+
 				// Make layer the size of the image
 				let fit_image_size = DAffine2::from_scale_angle_translation(image_size, 0., image_size / -2.);
 

editor/src/messages/portfolio/document/node_graph/node_graph_message_handler/document_node_types.rs

@@ -107,7 +107,35 @@ fn static_nodes() -> Vec<DocumentNodeType> {
 		DocumentNodeType {
 			name: "Image",
 			category: "Ignore",
-			identifier: NodeImplementation::proto("graphene_core::ops::IdNode"),
+			identifier: NodeImplementation::DocumentNode(NodeNetwork {
+				inputs: vec![0],
+				outputs: vec![NodeOutput::new(2, 0)],
+				nodes: [
+					DocumentNode {
+						name: "Downscale".to_string(),
+						inputs: vec![NodeInput::Network(concrete!(ImageFrame))],
+						implementation: DocumentNodeImplementation::Unresolved(NodeIdentifier::new("graphene_std::raster::DownscaleNode")),
+						metadata: Default::default(),
+					},
+					DocumentNode {
+						name: "Cache".to_string(),
+						inputs: vec![NodeInput::ShortCircut(concrete!(())), NodeInput::node(0, 0)],
+						implementation: DocumentNodeImplementation::Unresolved(NodeIdentifier::new("graphene_std::memo::CacheNode")),
+						metadata: Default::default(),
+					},
+					DocumentNode {
+						name: "Clone".to_string(),
+						inputs: vec![NodeInput::node(1, 0)],
+						implementation: DocumentNodeImplementation::Unresolved(NodeIdentifier::new("graphene_core::ops::CloneNode<_>")),
+						metadata: Default::default(),
+					},
+				]
+				.into_iter()
+				.enumerate()
+				.map(|(id, node)| (id as NodeId, node))
+				.collect(),
+				..Default::default()
+			}),
 			inputs: vec![DocumentInputType::value("Image", TaggedValue::ImageFrame(ImageFrame::empty()), false)],
 			outputs: vec![DocumentOutputType::new("Image", FrontendGraphDataType::Raster)],
 			properties: |_document_node, _node_id, _context| node_properties::string_properties("A bitmap image embedded in this node"),
@@ -422,7 +450,7 @@ fn static_nodes() -> Vec<DocumentNodeType> {
 						0,
 						DocumentNode {
 							name: "CacheNode".to_string(),
-							inputs: vec![NodeInput::Network(concrete!(Image))],
+							inputs: vec![NodeInput::ShortCircut(concrete!(())), NodeInput::Network(concrete!(ImageFrame))],
 							implementation: DocumentNodeImplementation::Unresolved(NodeIdentifier::new("graphene_std::memo::CacheNode")),
 							metadata: Default::default(),
 						},

editor/src/node_graph_executor.rs

@@ -81,6 +81,7 @@ impl NodeGraphExecutor {
 					inner_network.outputs[0] = NodeOutput::new(*node_id, *output_index);
 					break 'outer;
 				}
+				NodeInput::ShortCircut(_) => (),
 			}
 		}
 
@@ -92,7 +93,7 @@ impl NodeGraphExecutor {
 		use image::{ImageBuffer, Rgba};
 		use std::io::Cursor;
 
-		let (result_bytes, width, height) = image.as_flat_u8();
+		let (result_bytes, width, height) = image.into_flat_u8();
 
 		let mut output: ImageBuffer<Rgba<u8>, _> = image::ImageBuffer::from_raw(width, height, result_bytes).ok_or_else(|| "Invalid image size".to_string())?;
 		if let Some(size) = resize {