Add the Image Color Palette node (#1311)

* Add image color palette node

* Add max size of palette

* Code review cleanup

---------

Co-authored-by: 0hypercube <0hypercube@gmail.com>
Co-authored-by: Keavon Chambers <keavon@keavon.com>

node-graph/gcore/src/graphic_element/renderer.rs

@@ -617,6 +617,26 @@ impl GraphicElementRendered for Option<Color> {
 	fn add_click_targets(&self, _click_targets: &mut Vec<ClickTarget>) {}
 }
 
+impl GraphicElementRendered for Vec<Color> {
+	fn render_svg(&self, render: &mut SvgRender, _render_params: &RenderParams) {
+		for (index, &color) in self.iter().enumerate() {
+			render.leaf_tag("rect", |attributes| {
+				attributes.push("width", "100");
+				attributes.push("height", "100");
+				attributes.push("x", (index * 120).to_string());
+				attributes.push("y", "40");
+				attributes.push("fill", format!("#{}", color.rgba_hex()));
+			});
+		}
+	}
+
+	fn bounding_box(&self, _transform: DAffine2) -> Option<[DVec2; 2]> {
+		None
+	}
+
+	fn add_click_targets(&self, _click_targets: &mut Vec<ClickTarget>) {}
+}
+
 /// A segment of an svg string to allow for embedding blob urls
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum SvgSegment {

node-graph/gcore/src/raster/adjustments.rs

@@ -1128,4 +1128,12 @@ mod index_node {
 			ImageFrame::empty()
 		}
 	}
+
+	#[node_macro::node_impl(IndexNode)]
+	pub fn index_node(input: Vec<Color>, index: u32) -> Option<Color> {
+		if index as usize >= input.len() {
+			warn!("Index of colors is out of range: index is {index} and length is {}", input.len());
+		}
+		input.into_iter().nth(index as usize)
+	}
 }

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

@@ -67,6 +67,7 @@ pub enum TaggedValue {
 	SurfaceFrame(graphene_core::SurfaceFrame),
 	Footprint(graphene_core::transform::Footprint),
 	RenderOutput(RenderOutput),
+	Palette(Vec<Color>),
 }
 
 #[allow(clippy::derived_hash_with_manual_eq)]
@@ -138,6 +139,7 @@ impl Hash for TaggedValue {
 			Self::SurfaceFrame(surface_id) => surface_id.hash(state),
 			Self::Footprint(footprint) => footprint.hash(state),
 			Self::RenderOutput(render_output) => render_output.hash(state),
+			Self::Palette(palette) => palette.hash(state),
 		}
 	}
 }
@@ -196,6 +198,7 @@ impl<'a> TaggedValue {
 			TaggedValue::SurfaceFrame(x) => Box::new(x),
 			TaggedValue::Footprint(x) => Box::new(x),
 			TaggedValue::RenderOutput(x) => Box::new(x),
+			TaggedValue::Palette(x) => Box::new(x),
 		}
 	}
 
@@ -265,6 +268,7 @@ impl<'a> TaggedValue {
 			TaggedValue::SurfaceFrame(_) => concrete!(graphene_core::SurfaceFrame),
 			TaggedValue::Footprint(_) => concrete!(graphene_core::transform::Footprint),
 			TaggedValue::RenderOutput(_) => concrete!(RenderOutput),
+			TaggedValue::Palette(_) => concrete!(Vec<Color>),
 		}
 	}
 
@@ -326,6 +330,7 @@ impl<'a> TaggedValue {
 				Ok(TaggedValue::SurfaceFrame(frame.into()))
 			}
 			x if x == TypeId::of::<graphene_core::transform::Footprint>() => Ok(TaggedValue::Footprint(*downcast(input).unwrap())),
+			x if x == TypeId::of::<Vec<Color>>() => Ok(TaggedValue::Palette(*downcast(input).unwrap())),
 			_ => Err(format!("Cannot convert {:?} to TaggedValue", DynAny::type_name(input.as_ref()))),
 		}
 	}

node-graph/gstd/src/image_color_palette.rs

@@ -0,0 +1,83 @@
+use graphene_core::raster::ImageFrame;
+use graphene_core::Color;
+use graphene_core::Node;
+
+#[derive(Debug, Clone)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+pub struct ImageColorPaletteNode<MaxSize> {
+	max_size: MaxSize,
+}
+
+#[node_macro::node_fn(ImageColorPaletteNode)]
+fn image_color_palette(frame: ImageFrame<Color>, max_size: u32) -> Vec<Color> {
+	const GRID: f32 = 3.0;
+
+	let bins = GRID * GRID * GRID;
+
+	let mut histogram: Vec<usize> = vec![0; (bins + 1.0) as usize];
+	let mut colors: Vec<Vec<Color>> = vec![vec![]; (bins + 1.0) as usize];
+
+	for pixel in frame.image.data.iter() {
+		let r = pixel.r() * GRID;
+		let g = pixel.g() * GRID;
+		let b = pixel.b() * GRID;
+
+		let bin = (r * GRID + g * GRID + b * GRID) as usize;
+
+		histogram[bin] += 1;
+		colors[bin].push(pixel.to_gamma_srgb());
+	}
+
+	let shorted = histogram.iter().enumerate().filter(|(_, &count)| count > 0).map(|(i, _)| i).collect::<Vec<usize>>();
+
+	let mut palette = vec![];
+
+	for i in shorted.iter().take(max_size as usize) {
+		let list = colors[*i].clone();
+
+		let mut r = 0.0;
+		let mut g = 0.0;
+		let mut b = 0.0;
+		let mut a = 0.0;
+
+		for color in list.iter() {
+			r += color.r();
+			g += color.g();
+			b += color.b();
+			a += color.a();
+		}
+
+		r /= list.len() as f32;
+		g /= list.len() as f32;
+		b /= list.len() as f32;
+		a /= list.len() as f32;
+
+		let color = Color::from_rgbaf32(r, g, b, a).unwrap();
+
+		palette.push(color);
+	}
+
+	return palette;
+}
+
+#[cfg(test)]
+mod test {
+	use graphene_core::{raster::Image, value::CopiedNode};
+
+	use super::*;
+
+	#[test]
+	fn test_image_color_palette() {
+		assert_eq!(
+			ImageColorPaletteNode { max_size: CopiedNode(1u32) }.eval(ImageFrame {
+				image: Image {
+					width: 100,
+					height: 100,
+					data: vec![Color::from_rgbaf32(0.0, 0.0, 0.0, 1.0).unwrap(); 10000],
+				},
+				..Default::default()
+			}),
+			[Color::from_rgbaf32(0.0, 0.0, 0.0, 1.0).unwrap()]
+		);
+	}
+}

node-graph/gstd/src/lib.rs

@@ -21,6 +21,8 @@ pub use graphene_core::*;
 
 pub mod image_segmentation;
 
+pub mod image_color_palette;
+
 pub mod brush;
 
 #[cfg(feature = "wasm")]

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

@@ -442,9 +442,11 @@ fn node_registry() -> HashMap<ProtoNodeIdentifier, HashMap<NodeIOTypes, NodeCons
 		raster_node!(graphene_core::raster::ExtractOpaqueNode<>, params: []),
 		raster_node!(graphene_core::raster::LevelsNode<_, _, _, _, _>, params: [f32, f32, f32, f32, f32]),
 		register_node!(graphene_std::image_segmentation::ImageSegmentationNode<_>, input: ImageFrame<Color>, params: [ImageFrame<Color>]),
+		register_node!(graphene_std::image_color_palette::ImageColorPaletteNode<_>, input: ImageFrame<Color>, params: [u32]),
 		register_node!(graphene_core::raster::IndexNode<_>, input: Vec<ImageFrame<Color>>, params: [u32]),
 		register_node!(graphene_core::raster::adjustments::ColorFillNode<_>, input: ImageFrame<Color>, params: [Color]),
 		register_node!(graphene_core::raster::adjustments::ColorOverlayNode<_, _, _>, input: ImageFrame<Color>, params: [Color, BlendMode, f32]),
+		register_node!(graphene_core::raster::IndexNode<_>, input: Vec<Color>, params: [u32]),
 		vec![(
 			ProtoNodeIdentifier::new("graphene_core::raster::BlendNode<_, _, _, _>"),
 			|args| {
@@ -561,8 +563,11 @@ fn node_registry() -> HashMap<ProtoNodeIdentifier, HashMap<NodeIOTypes, NodeCons
 		async_node!(graphene_core::memo::EndLetNode<_, _>, input: WasmEditorApi, output: RenderOutput, params: [bool]),
 		async_node!(graphene_core::memo::EndLetNode<_, _>, input: WasmEditorApi, output: RenderOutput, params: [String]),
 		async_node!(graphene_core::memo::EndLetNode<_, _>, input: WasmEditorApi, output: RenderOutput, params: [Option<Color>]),
+		async_node!(graphene_core::memo::EndLetNode<_, _>, input: WasmEditorApi, output: RenderOutput, params: [Vec<Color>]),
 		async_node!(graphene_core::memo::EndLetNode<_, _>, input: WasmEditorApi, output: RenderOutput, fn_params: [Footprint => VectorData]),
 		async_node!(graphene_core::memo::EndLetNode<_, _>, input: WasmEditorApi, output: RenderOutput, fn_params: [Footprint => ImageFrame<Color>]),
+		async_node!(graphene_core::memo::EndLetNode<_, _>, input: WasmEditorApi, output: RenderOutput, fn_params: [Footprint => Option<Color>]),
+		async_node!(graphene_core::memo::EndLetNode<_, _>, input: WasmEditorApi, output: RenderOutput, fn_params: [Footprint => Vec<Color>]),
 		async_node!(
 			graphene_core::memo::EndLetNode<_, _>,
 			input: WasmEditorApi,
@@ -666,6 +671,9 @@ fn node_registry() -> HashMap<ProtoNodeIdentifier, HashMap<NodeIOTypes, NodeCons
 		async_node!(graphene_std::wasm_application_io::RenderNode<_, _, _>, input: WasmEditorApi, output: RenderOutput, fn_params: [() => f64, () => Arc<WasmSurfaceHandle>]),
 		async_node!(graphene_std::wasm_application_io::RenderNode<_, _, _>, input: WasmEditorApi, output: RenderOutput, fn_params: [() => String, () => Arc<WasmSurfaceHandle>]),
 		async_node!(graphene_std::wasm_application_io::RenderNode<_, _, _>, input: WasmEditorApi, output: RenderOutput, fn_params: [() => Option<Color>, () => Arc<WasmSurfaceHandle>]),
+		async_node!(graphene_std::wasm_application_io::RenderNode<_, _, _>, input: WasmEditorApi, output: RenderOutput, fn_params: [Footprint => Option<Color>, () => Arc<WasmSurfaceHandle>]),
+		async_node!(graphene_std::wasm_application_io::RenderNode<_, _, _>, input: WasmEditorApi, output: RenderOutput, fn_params: [() => Vec<Color>, () => Arc<WasmSurfaceHandle>]),
+		async_node!(graphene_std::wasm_application_io::RenderNode<_, _, _>, input: WasmEditorApi, output: RenderOutput, fn_params: [Footprint => Vec<Color>, () => Arc<WasmSurfaceHandle>]),
 		//register_node!(graphene_core::transform::TranformNode<_, _, _, _, _, _>, input: , output: RenderOutput, fn_params: [Footprint => GraphicGroup, () => Arc<WasmSurfaceHandle>]),
 		vec![
 			(