website: add pixelated image placeholders with fade-in transition

Build-time script generates tiny 32px-wide versions of all images in
public/ using sharp. At runtime, PixelatedImage component renders these
with CSS image-rendering: pixelated (nearest-neighbor / point sampling)
for a crisp mosaic effect, then fades in the real image on load.

- Auto-discovers images in public/, skips placeholder- prefixed files
- Mtime check skips regeneration when placeholder is newer than source
- Callback ref handles cached images where onLoad fires before mount
- Explicit z-index prevents placeholder from covering the real image
- Runs automatically as part of pnpm build in website package
This commit is contained in:
Tommy D. Rossi
2026-02-21 15:22:39 +01:00
parent 00baca9c2b
commit 3b3959f5ab
9 changed files with 179 additions and 10 deletions
+4 -3
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@@ -491,6 +491,9 @@ importers:
'@xmorse/deployment-utils':
specifier: ^0.7.2
version: 0.7.2(@types/node@25.0.3)(jiti@2.6.1)(lightningcss@1.31.1)(tsx@4.20.6)(yaml@2.6.0)
sharp:
specifier: ^0.34.5
version: 0.34.5
tailwindcss:
specifier: ^4.2.0
version: 4.2.0
@@ -7856,8 +7859,7 @@ snapshots:
'@iarna/toml@2.2.5': {}
'@img/colour@1.0.0':
optional: true
'@img/colour@1.0.0': {}
'@img/sharp-darwin-arm64@0.34.5':
optionalDependencies:
@@ -12869,7 +12871,6 @@ snapshots:
'@img/sharp-win32-arm64': 0.34.5
'@img/sharp-win32-ia32': 0.34.5
'@img/sharp-win32-x64': 0.34.5
optional: true
shebang-command@2.0.0:
dependencies:
+3 -1
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@@ -3,7 +3,8 @@
"private": true,
"type": "module",
"scripts": {
"build": "react-router build",
"placeholders": "tsx scripts/generate-placeholders.ts",
"build": "tsx scripts/generate-placeholders.ts && react-router build",
"dev": "react-router dev --port 8044",
"typecheck": "react-router typegen && tsc"
},
@@ -39,6 +40,7 @@
"@types/react-dom": "^19.2.3",
"@vitejs/plugin-react": "^5.1.2",
"@xmorse/deployment-utils": "^0.7.2",
"sharp": "^0.34.5",
"tailwindcss": "^4.2.0",
"typescript": "^5.9.3",
"vite": "^7.3.0",
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+67
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@@ -0,0 +1,67 @@
/*
* Generate pixelated placeholder images for the website.
*
* Scans website/public/ for all image files (png, jpg, jpeg, webp) and
* generates a tiny 32px-wide version of each. When displayed at full size
* with CSS `image-rendering: pixelated` (nearest-neighbor / point sampling),
* these produce a crisp mosaic effect instead of a blurry upscale.
*
* Skips files that already have the `placeholder-` prefix.
* Skips regeneration if the placeholder is newer than the source image.
*
* Usage: tsx website/scripts/generate-placeholders.ts
*/
import sharp from "sharp";
import path from "node:path";
import fs from "node:fs";
const PUBLIC_DIR = path.resolve(import.meta.dirname, "../public");
const PLACEHOLDER_PREFIX = "placeholder-";
const PLACEHOLDER_WIDTH = 32;
const IMAGE_EXTENSIONS = new Set([".png", ".jpg", ".jpeg", ".webp"]);
async function main() {
const entries = fs.readdirSync(PUBLIC_DIR);
const images = entries.filter((name) => {
if (name.startsWith(PLACEHOLDER_PREFIX)) {
return false;
}
const ext = path.extname(name).toLowerCase();
return IMAGE_EXTENSIONS.has(ext);
});
if (images.length === 0) {
console.error("No images found in public/");
return;
}
for (const name of images) {
const inputPath = path.join(PUBLIC_DIR, name);
const ext = path.extname(name);
const base = path.basename(name, ext);
const outputPath = path.join(PUBLIC_DIR, `${PLACEHOLDER_PREFIX}${base}${ext}`);
// Skip if placeholder already exists and is newer than source
if (fs.existsSync(outputPath)) {
const srcMtime = fs.statSync(inputPath).mtimeMs;
const outMtime = fs.statSync(outputPath).mtimeMs;
if (outMtime > srcMtime) {
continue;
}
}
await sharp(inputPath)
.resize(PLACEHOLDER_WIDTH)
.png({ compressionLevel: 9 })
.toFile(outputPath);
const stats = fs.statSync(outputPath);
console.error(
`Generated ${PLACEHOLDER_PREFIX}${base}${ext} (${PLACEHOLDER_WIDTH}px wide, ${stats.size} bytes)`,
);
}
}
main();
+89 -1
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@@ -6,7 +6,7 @@
* --link-accent, --page-border.
*/
import { useEffect, useRef, useState } from "react";
import { useCallback, useEffect, useRef, useState } from "react";
import Prism from "prismjs";
import "prismjs/components/prism-jsx";
import "prismjs/components/prism-tsx";
@@ -416,6 +416,94 @@ export function CodeBlock({ children, lang = "jsx", lineHeight = "1.85" }: { chi
);
}
/* =========================================================================
Pixelated placeholder image
Uses a tiny pre-generated image with CSS image-rendering: pixelated
(nearest-neighbor / point sampling in GPU terms) for a crisp mosaic
effect. The real image fades in on top once loaded — no flash because
the placeholder stays underneath and the real image starts at opacity 0.
========================================================================= */
export function PixelatedImage({
src,
placeholder,
alt,
width,
height,
className = "",
style,
}: {
src: string;
placeholder: string;
alt: string;
width: number;
height: number;
className?: string;
style?: React.CSSProperties;
}) {
const [loaded, setLoaded] = useState(false);
// Handles both the normal onLoad event and the case where the image is
// already cached (img.complete is true before React mounts the handler).
const imgRef = useCallback((img: HTMLImageElement | null) => {
if (img?.complete && img.naturalWidth > 0) {
setLoaded(true);
}
}, []);
return (
<div
className={className}
style={{
position: "relative",
width: "100%",
maxWidth: `${width}px`,
aspectRatio: `${width} / ${height}`,
overflow: "hidden",
...style,
}}
>
{/* Placeholder: tiny image rendered with nearest-neighbor sampling */}
<img
src={placeholder}
alt=""
aria-hidden
width={width}
height={height}
style={{
position: "absolute",
inset: 0,
width: "100%",
height: "100%",
objectFit: "cover",
imageRendering: "pixelated",
zIndex: 0,
}}
/>
{/* Real image: starts invisible, fades in over the placeholder */}
<img
ref={imgRef}
src={src}
alt={alt}
width={width}
height={height}
onLoad={() => {
setLoaded(true);
}}
style={{
position: "relative",
width: "100%",
height: "100%",
objectFit: "cover",
opacity: loaded ? 1 : 0,
transition: "opacity 0.4s ease",
zIndex: 1,
}}
/>
</div>
);
}
/* =========================================================================
Chart placeholder (dark box with animated line)
========================================================================= */
+16 -5
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@@ -18,6 +18,7 @@ import {
List,
OL,
Li,
PixelatedImage,
} from "website/src/components/markdown";
export const meta: MetaFunction = () => {
@@ -70,8 +71,9 @@ export default function IndexPage() {
</P>
<div className="bleed" style={{ display: "flex", justifyContent: "center" }}>
<img
<PixelatedImage
src="/screenshot@2x.png"
placeholder="/placeholder-screenshot@2x.png"
alt="Playwriter controlling Chrome with accessibility labels overlay"
width={1280}
height={800}
@@ -102,7 +104,7 @@ export default function IndexPage() {
<Section id="getting-started" title="Getting started">
<P>
<strong>Three steps</strong> and your agent is browsing.
<strong>Four steps</strong> and your agent is browsing.
</P>
<OL>
@@ -110,13 +112,22 @@ export default function IndexPage() {
Install the{" "}
<A href="https://chromewebstore.google.com/detail/playwriter-mcp/jfeammnjpkecdekppnclgkkffahnhfhe">Chrome extension</A>
</Li>
<Li>Click the extension icon on a tab it turns green</Li>
<Li>Install CLI and run your first command:</Li>
<Li>Click the extension icon on a tab {" \u2014 "} it turns green</Li>
<Li>Install the CLI:</Li>
</OL>
<CodeBlock lang="bash">{dedent`
npm i -g playwriter
playwriter -s 1 -e "await page.goto('https://example.com')"
`}</CodeBlock>
<P>
Then install the <strong>skill</strong> {" \u2014 "} it teaches your agent how to use
Playwriter: which selectors to use, how to avoid timeouts, how to
read snapshots, and all available utilities.
</P>
<CodeBlock lang="bash">{dedent`
npx -y skills add remorses/playwriter
`}</CodeBlock>
<P>