Allow changing the palette with a colour picker 🎨.

src/components/ColourPicker.js

@@ -0,0 +1,73 @@
+import { useState, useEffect } from 'react';
+import {
+  Popover,
+  PopoverButton,
+  CloseButton,
+  PopoverPanel,
+} from '@headlessui/react';
+import ColourSwatch from './ColourSwatch';
+import { digitalPrimeFbxPalette as colourPalette } from '../lib/palettes';
+import { XMarkIcon } from '@heroicons/react/16/solid';
+import { clsx } from 'clsx';
+import { getLuminosity } from '../lib/paletteUtils';
+
+// ColourPicker uses shades of `neutral` instead of the usual `slate`.
+// This is to avoid the frame to visually pollute the colours.
+
+const ColourPicker = ({ colourId, onPick, children }) => {
+  const [selectedColour, setSelectedColour] = useState(colourId);
+
+  useEffect(() => {
+    setSelectedColour(colourId);
+  }, [colourId]);
+
+  return (
+    <Popover
+      className="relative"
+      as="span">
+      <PopoverButton className="h-6 w-8">{children}</PopoverButton>
+      <PopoverPanel
+        anchor={{ to: 'bottom', gap: '0.125rem' }}
+        className="rounded bg-neutral-500 drop-shadow">
+        <div className="flex justify-between px-2">
+          <span className="text-sm font-medium leading-6 text-neutral-300 dark:text-neutral-700"></span>
+          <CloseButton
+            as="button"
+            type="button"
+            className="-m-2 rounded-md p-2 text-neutral-300 hover:text-neutral-100 dark:text-neutral-700 hover:dark:text-neutral-900">
+            <span className="sr-only">Close menu</span>
+            <XMarkIcon
+              strokeWidth="2"
+              className="size-6"
+              aria-hidden="true"
+            />
+          </CloseButton>
+        </div>
+
+        <div className="grid-cols-14 mx-2 mb-2 grid">
+          {colourPalette.map((c, i) =>
+            i % 16 <= 13 ? (
+              <ColourSwatch
+                key={i}
+                colour={c}
+                className={clsx(
+                  i === selectedColour
+                    ? getLuminosity(c) < 127
+                      ? 'border-2 !border-neutral-100'
+                      : 'border-2 border-neutral-900'
+                    : 'rounded-none border-0',
+                )}
+                onClick={() => {
+                  setSelectedColour(i);
+                  onPick(i);
+                }}
+              />
+            ) : null,
+          )}
+        </div>
+      </PopoverPanel>
+    </Popover>
+  );
+};
+
+export default ColourPicker;

src/components/ColourSwatch.js

@@ -1,6 +1,12 @@
-const ColourSwatch = ({ colour }) => (
+import { clsx } from 'clsx';
+
+const ColourSwatch = ({ colour, className, ...props }) => (
   <span
-    className="inline-block h-6 w-8 rounded border border-slate-600 dark:border-slate-400"
+    {...props}
+    className={clsx(
+      'inline-block h-6 w-8 rounded border border-neutral-500',
+      className,
+    )}
     style={{ backgroundColor: colour }}
   />
 );

src/components/Palettes.js

@@ -1,28 +1,43 @@
+import ColourPicker from './ColourPicker';
 import ColourSwatch from './ColourSwatch';
 import { getPalette } from '../lib/paletteUtils';
 
-const Palettes = ({ nametable }) => {
+const Palettes = ({ palette, onUpdate }) => {
   const colourSwatches = [];
 
   for (let i = 0; i < 16; i += 4) {
-    const palette = getPalette(
-      [
-        nametable.palette[i],
-        nametable.palette[i + 1],
-        nametable.palette[i + 2],
-        nametable.palette[i + 3],
-      ],
+    const colours = getPalette(
+      [palette[i], palette[i + 1], palette[i + 2], palette[i + 3]],
       true,
     );
 
     colourSwatches.push(
       <li
         key={i}
         className="ml-6 space-x-4 whitespace-nowrap pl-2">
-        <ColourSwatch colour={palette[0]} />
-        <ColourSwatch colour={palette[1]} />
-        <ColourSwatch colour={palette[2]} />
-        <ColourSwatch colour={palette[3]} />
+        <ColourPicker
+          colourId={palette[i]}
+          onPick={(newColour) => onUpdate(i, newColour)}>
+          <ColourSwatch colour={colours[0]} />
+        </ColourPicker>
+
+        <ColourPicker
+          colourId={palette[i + 1]}
+          onPick={(newColour) => onUpdate(i + 1, newColour)}>
+          <ColourSwatch colour={colours[1]} />
+        </ColourPicker>
+
+        <ColourPicker
+          colourId={palette[i + 2]}
+          onPick={(newColour) => onUpdate(i + 2, newColour)}>
+          <ColourSwatch colour={colours[2]} />
+        </ColourPicker>
+
+        <ColourPicker
+          colourId={palette[i + 3]}
+          onPick={(newColour) => onUpdate(i + 3, newColour)}>
+          <ColourSwatch colour={colours[3]} />
+        </ColourPicker>
       </li>,
     );
   }

src/containers/RoomsContainer.js

@@ -54,6 +54,12 @@ const RoomsContainer = ({ rooms, roomgfx, globdata }) => {
     setSelectedObjects(newSelectedObjects);
   };
 
+  const updatePalette = (i, colourId) => {
+    const newRoom = structuredClone(room);
+    newRoom.nametable.palette[i] = colourId;
+    setRoom(newRoom);
+  };
+
   if (room && !room.header) {
     return null;
   }
@@ -106,7 +112,10 @@ const RoomsContainer = ({ rooms, roomgfx, globdata }) => {
               setCurrentTab={setCurrentTab}
             />
             {currentTab === 'Palettes' && (
-              <Palettes nametable={room.nametable} />
+              <Palettes
+                palette={room.nametable.palette}
+                onUpdate={updatePalette}
+              />
             )}
             {currentTab === 'Tilesets' && (
               <RoomGfx

src/lib/paletteUtils.js

@@ -67,4 +67,4 @@ const getLuminosity = (color = '') => {
   return m[0] * 0.299 + m[1] * 0.587 + m[2] * 0.114;
 };
 
-export { getPalette };
+export { getPalette, getLuminosity };

tailwind.config.js

@@ -10,6 +10,9 @@ const config = {
         primary: colors.sky,
         gray: colors.slate,
       },
+      gridTemplateColumns: {
+        14: 'repeat(14, minmax(0, 1fr))',
+      },
     },
     // prettier-ignore
     // https://github.com/system-fonts/modern-font-stacks