fix(ui): fix color input field alpha

Closes #5647

The alpha values in the UI are `0-1` but the backend wants `0-255`.

Previously, this was handled in `parseFIeldValue` when building the graph. In a recent release, field types were refactored and broke the alpha handling.

The logic for handling alpha values is moved into `ColorFieldInputComponent`, and `parseFieldValue` now just does no value transformations.

Though it would be a minor change, I'm leaving this function in because I don't want to change the rest of the logic except when necessary.

invokeai/frontend/web/src/features/nodes/components/flow/nodes/Invocation/fields/inputs/ColorFieldInputComponent.tsx

@@ -1,31 +1,47 @@
 import { useAppDispatch } from 'app/store/storeHooks';
 import { fieldColorValueChanged } from 'features/nodes/store/nodesSlice';
 import type { ColorFieldInputInstance, ColorFieldInputTemplate } from 'features/nodes/types/field';
-import { memo, useCallback } from 'react';
+import { memo, useCallback, useMemo } from 'react';
 import type { RgbaColor } from 'react-colorful';
 import { RgbaColorPicker } from 'react-colorful';
 
 import type { FieldComponentProps } from './types';
 
+const FALLBACK_COLOR: RgbaColor = { r: 0, g: 0, b: 0, a: 255 };
+
 const ColorFieldInputComponent = (props: FieldComponentProps<ColorFieldInputInstance, ColorFieldInputTemplate>) => {
   const { nodeId, field } = props;
 
   const dispatch = useAppDispatch();
 
+  const color = useMemo(() => {
+    // For better or worse, zColorFieldValue is typed as optional. This means that `field.value` and `fieldTemplate.default`
+    // can be undefined. Rather than changing the schema (which could have other consequences), we can just provide a fallback.
+    if (!field.value) {
+      return FALLBACK_COLOR;
+    }
+    const { r, g, b, a } = field.value;
+    // We need to divide by 255 to convert from 0-255 to 0-1, which is what the UI component needs
+    return { r, g, b, a: a / 255 };
+  }, [field.value]);
+
   const handleValueChanged = useCallback(
     (value: RgbaColor) => {
+      // We need to multiply by 255 to convert from 0-1 to 0-255, which is what the backend needs
+      const { r, g, b, a: _a } = value;
+      const a = Math.round(_a * 255);
       dispatch(
         fieldColorValueChanged({
           nodeId,
           fieldName: field.name,
-          value,
+          value: { r, g, b, a },
         })
       );
     },
     [dispatch, field.name, nodeId]
   );
 
-  return <RgbaColorPicker className="nodrag" color={field.value} onChange={handleValueChanged} />;
+  return <RgbaColorPicker className="nodrag" color={color} onChange={handleValueChanged} />;
 };
 
 export default memo(ColorFieldInputComponent);

invokeai/frontend/web/src/features/nodes/util/graph/buildNodesGraph.ts

@@ -1,8 +1,7 @@
 import type { NodesState } from 'features/nodes/store/types';
 import type { FieldInputInstance } from 'features/nodes/types/field';
-import { isColorFieldInputInstance } from 'features/nodes/types/field';
 import { isInvocationNode } from 'features/nodes/types/invocation';
-import { cloneDeep, omit, reduce } from 'lodash-es';
+import { omit, reduce } from 'lodash-es';
 import type { Graph } from 'services/api/types';
 import type { AnyInvocation } from 'services/events/types';
 import { v4 as uuidv4 } from 'uuid';
@@ -11,21 +10,7 @@ import { v4 as uuidv4 } from 'uuid';
  * We need to do special handling for some fields
  */
 export const parseFieldValue = (field: FieldInputInstance) => {
-  if (isColorFieldInputInstance(field)) {
-    if (field.value) {
-      const clonedValue = cloneDeep(field.value);
-
-      const { r, g, b, a } = field.value;
-
-      // scale alpha value to PIL's desired range 0-255
-      const scaledAlpha = Math.max(0, Math.min(a * 255, 255));
-      const transformedColor = { r, g, b, a: scaledAlpha };
-
-      Object.assign(clonedValue, transformedColor);
-      return clonedValue;
-    }
-  }
-
+  // Currently, no special handling is needed.
   return field.value;
 };