feat(ui): rough out eyedropper tool

It's a bit slow bc we are converting the stage to canvas on every mouse move. Also need to improve the visual but it works.

invokeai/frontend/web/src/features/controlLayers/components/ControlLayersToolbar.tsx

@@ -20,7 +20,6 @@ import { memo, useCallback } from 'react';
 export const ControlLayersToolbar = memo(() => {
   const tool = useAppSelector((s) => s.canvasV2.tool.selected);
   const canvasManager = useStore($canvasManager);
-
   const onChangeDebugging = useCallback(
     (e: ChangeEvent<HTMLInputElement>) => {
       if (!canvasManager) {

invokeai/frontend/web/src/features/controlLayers/components/ToolChooser.tsx

@@ -5,6 +5,7 @@ import { BrushToolButton } from 'features/controlLayers/components/BrushToolButt
 import { EraserToolButton } from 'features/controlLayers/components/EraserToolButton';
 import { MoveToolButton } from 'features/controlLayers/components/MoveToolButton';
 import { RectToolButton } from 'features/controlLayers/components/RectToolButton';
+import { ToolEyeDropperButton } from 'features/controlLayers/components/ToolEyeDropperButton';
 import { TransformToolButton } from 'features/controlLayers/components/TransformToolButton';
 import { ViewToolButton } from 'features/controlLayers/components/ViewToolButton';
 import { useCanvasDeleteLayerHotkey } from 'features/controlLayers/hooks/useCanvasDeleteLayerHotkey';
@@ -24,6 +25,7 @@ export const ToolChooser: React.FC = () => {
         <MoveToolButton />
         <ViewToolButton />
         <BboxToolButton />
+        <ToolEyeDropperButton />
       </ButtonGroup>
       <TransformToolButton />
     </>

invokeai/frontend/web/src/features/controlLayers/components/ToolEyeDropperButton.tsx

@@ -0,0 +1,34 @@
+import { IconButton } from '@invoke-ai/ui-library';
+import { useAppDispatch, useAppSelector } from 'app/store/storeHooks';
+import { toolChanged } from 'features/controlLayers/store/canvasV2Slice';
+import { memo, useCallback } from 'react';
+import { useHotkeys } from 'react-hotkeys-hook';
+import { useTranslation } from 'react-i18next';
+import { PiEyedropperBold } from 'react-icons/pi';
+
+export const ToolEyeDropperButton = memo(() => {
+  const { t } = useTranslation();
+  const dispatch = useAppDispatch();
+  const isDisabled = useAppSelector((s) => s.canvasV2.session.isStaging || s.canvasV2.tool.isTransforming);
+  const isSelected = useAppSelector((s) => s.canvasV2.tool.selected === 'eyeDropper');
+
+  const onClick = useCallback(() => {
+    dispatch(toolChanged('eyeDropper'));
+  }, [dispatch]);
+
+  useHotkeys('i', onClick, { enabled: !isDisabled }, [onClick, isDisabled]);
+
+  return (
+    <IconButton
+      aria-label={`${t('controlLayers.eyeDropper')} (I)`}
+      tooltip={`${t('controlLayers.eyeDropper')} (I)`}
+      icon={<PiEyedropperBold />}
+      colorScheme={isSelected ? 'invokeBlue' : 'base'}
+      variant="outline"
+      onClick={onClick}
+      isDisabled={isDisabled}
+    />
+  );
+});
+
+ToolEyeDropperButton.displayName = 'ToolEyeDropperButton';

invokeai/frontend/web/src/features/controlLayers/konva/CanvasStateApi.ts

@@ -26,6 +26,7 @@ import {
   entityReset,
   entitySelected,
   eraserWidthChanged,
+  fillChanged,
   rasterLayerCompositeRasterized,
   toolBufferChanged,
   toolChanged,
@@ -144,6 +145,9 @@ export class CanvasStateApi {
     log.trace({ toolBuffer }, 'Setting tool buffer');
     this._store.dispatch(toolBufferChanged(toolBuffer));
   };
+  setFill = (fill: RgbaColor) => {
+    return this._store.dispatch(fillChanged(fill));
+  };
 
   getBbox = () => {
     return this.getState().bbox;
@@ -257,6 +261,7 @@ export class CanvasStateApi {
   $currentFill: WritableAtom<RgbaColor> = atom();
   $selectedEntity: WritableAtom<EntityStateAndAdapter | null> = atom();
   $selectedEntityIdentifier: WritableAtom<CanvasEntityIdentifier | null> = atom();
+  $colorUnderCursor: WritableAtom<RgbaColor | null> = atom();
 
   // Read-write state, ephemeral interaction state
   $isDrawing = $isDrawing;

invokeai/frontend/web/src/features/controlLayers/konva/CanvasTool.ts

@@ -35,6 +35,11 @@ export class CanvasTool {
       innerBorderCircle: Konva.Circle;
       outerBorderCircle: Konva.Circle;
     };
+    eyeDropper: {
+      group: Konva.Group;
+      fillCircle: Konva.Circle;
+      transparentCenterCircle: Konva.Circle;
+    };
   };
 
   /**
@@ -96,6 +101,26 @@ export class CanvasTool {
           strokeEnabled: true,
         }),
       },
+      eyeDropper: {
+        group: new Konva.Group({ name: `${this.type}:eyeDropper_group` }),
+        fillCircle: new Konva.Circle({
+          name: `${this.type}:eyeDropper_fill_circle`,
+          listening: false,
+          fill: '',
+          radius: 20,
+          strokeWidth: 1,
+          stroke: 'black',
+          strokeScaleEnabled: false,
+        }),
+        transparentCenterCircle: new Konva.Circle({
+          name: `${this.type}:eyeDropper_fill_circle`,
+          listening: false,
+          strokeEnabled: false,
+          fill: 'white',
+          radius: 5,
+          globalCompositeOperation: 'destination-out',
+        }),
+      },
     };
     this.konva.brush.group.add(this.konva.brush.fillCircle);
     this.konva.brush.group.add(this.konva.brush.innerBorderCircle);
@@ -107,6 +132,10 @@ export class CanvasTool {
     this.konva.eraser.group.add(this.konva.eraser.outerBorderCircle);
     this.konva.group.add(this.konva.eraser.group);
 
+    this.konva.eyeDropper.group.add(this.konva.eyeDropper.fillCircle);
+    this.konva.eyeDropper.group.add(this.konva.eyeDropper.transparentCenterCircle);
+    this.konva.group.add(this.konva.eyeDropper.group);
+
     this.subscriptions.add(
       this.manager.stateApi.$stageAttrs.listen(() => {
         this.render();
@@ -146,6 +175,12 @@ export class CanvasTool {
     });
   };
 
+  setToolVisibility = (tool: 'brush' | 'eraser' | 'eyeDropper' | 'none') => {
+    this.konva.brush.group.visible(tool === 'brush');
+    this.konva.eraser.group.visible(tool === 'eraser');
+    this.konva.eyeDropper.group.visible(tool === 'eyeDropper');
+  };
+
   render() {
     const stage = this.manager.stage;
     const renderedEntityCount: number = 1; // TODO(psyche): this.manager should be renderable entity count
@@ -154,6 +189,7 @@ export class CanvasTool {
     const cursorPos = this.manager.stateApi.$lastCursorPos.get();
     const isDrawing = this.manager.stateApi.$isDrawing.get();
     const isMouseDown = this.manager.stateApi.$isMouseDown.get();
+    const colorUnderCursor = this.manager.stateApi.$colorUnderCursor.get();
 
     const tool = toolState.selected;
 
@@ -180,6 +216,8 @@ export class CanvasTool {
       stage.container().style.cursor = 'none';
     } else if (tool === 'bbox') {
       stage.container().style.cursor = 'default';
+    } else if (tool === 'eyeDropper') {
+      stage.container().style.cursor = 'none';
     }
 
     stage.draggable(tool === 'view');
@@ -216,9 +254,7 @@ export class CanvasTool {
         });
 
         this.scaleTool();
-
-        this.konva.brush.group.visible(true);
-        this.konva.eraser.group.visible(false);
+        this.setToolVisibility('brush');
       } else if (cursorPos && tool === 'eraser') {
         const alignedCursorPos = alignCoordForTool(cursorPos, toolState.eraser.width);
 
@@ -243,12 +279,20 @@ export class CanvasTool {
         });
 
         this.scaleTool();
-
-        this.konva.brush.group.visible(false);
-        this.konva.eraser.group.visible(true);
+        this.setToolVisibility('eraser');
+      } else if (cursorPos && colorUnderCursor) {
+        this.konva.eyeDropper.fillCircle.setAttrs({
+          x: cursorPos.x,
+          y: cursorPos.y,
+          fill: rgbaColorToString(colorUnderCursor),
+        });
+        this.konva.eyeDropper.transparentCenterCircle.setAttrs({
+          x: cursorPos.x,
+          y: cursorPos.y,
+        });
+        this.setToolVisibility('eyeDropper');
       } else {
-        this.konva.brush.group.visible(false);
-        this.konva.eraser.group.visible(false);
+        this.setToolVisibility('none');
       }
     }
   }

invokeai/frontend/web/src/features/controlLayers/konva/events.ts

@@ -12,6 +12,7 @@ import type {
   CanvasRegionalGuidanceState,
   CanvasV2State,
   Coordinate,
+  RgbaColor,
   Tool,
 } from 'features/controlLayers/store/types';
 import { isDrawableEntity, isDrawableEntityAdapter } from 'features/controlLayers/store/types';
@@ -115,6 +116,23 @@ const getLastPointOfLastLineOfEntity = (
   return { x, y };
 };
 
+const getColorUnderCursor = (stage: Konva.Stage): RgbaColor | null => {
+  const pos = stage.getPointerPosition();
+  if (!pos) {
+    return null;
+  }
+  const ctx = stage.toCanvas({ x: pos.x, y: pos.y, width: 1, height: 1 }).getContext('2d');
+  if (!ctx) {
+    return null;
+  }
+  const [r, g, b, a] = ctx.getImageData(0, 0, 1, 1).data;
+  if (r === undefined || g === undefined || b === undefined || a === undefined) {
+    return null;
+  }
+
+  return { r, g, b, a };
+};
+
 export const setStageEventHandlers = (manager: CanvasManager): (() => void) => {
   const { stage, stateApi } = manager;
   const {
@@ -174,6 +192,14 @@ export const setStageEventHandlers = (manager: CanvasManager): (() => void) => {
     const pos = updateLastCursorPos(stage, $lastCursorPos.set);
     const selectedEntity = getSelectedEntity();
 
+    if (toolState.selected === 'eyeDropper') {
+      const color = getColorUnderCursor(stage);
+      manager.stateApi.$colorUnderCursor.set(color);
+      if (color) {
+        manager.stateApi.setFill(color);
+      }
+    }
+
     if (
       pos &&
       selectedEntity &&
@@ -322,6 +348,11 @@ export const setStageEventHandlers = (manager: CanvasManager): (() => void) => {
     const pos = updateLastCursorPos(stage, $lastCursorPos.set);
     const selectedEntity = getSelectedEntity();
 
+    if (toolState.selected === 'eyeDropper') {
+      const color = getColorUnderCursor(stage);
+      manager.stateApi.$colorUnderCursor.set(color);
+    }
+
     if (
       pos &&
       selectedEntity &&

invokeai/frontend/web/src/features/controlLayers/store/types.ts

@@ -469,7 +469,7 @@ export const IMAGE_FILTERS: { [key in FilterConfig['type']]: ImageFilterData<key
   },
 } as const;
 
-const zTool = z.enum(['brush', 'eraser', 'move', 'rect', 'view', 'bbox']);
+const zTool = z.enum(['brush', 'eraser', 'move', 'rect', 'view', 'bbox', 'eyeDropper']);
 export type Tool = z.infer<typeof zTool>;
 export function isDrawingTool(tool: Tool): tool is 'brush' | 'eraser' | 'rect' {
   return tool === 'brush' || tool === 'eraser' || tool === 'rect';