openstatus.dev
Openstatus
www.openstatus.dev
fix: web layout shift (#1803)
* fix: image layout shift
* fix: image dimensions
* fix: missing suspense fallback
authored by
Maximilian Kaske
and committed by
GitHub
83a8879d
2175ea78
+105
-19
+29
-18
apps/web/src/content/mdx.tsx
+29
-18
apps/web/src/content/mdx.tsx
···
1
1
import { existsSync } from "node:fs";
2
2
import { join } from "node:path";
3
+
import { getImageDimensions } from "@/lib/image-dimensions";
3
4
import { cn } from "@/lib/utils";
4
5
import { Button } from "@openstatus/ui";
5
6
import { MDXRemote, type MDXRemoteProps } from "next-mdx-remote/rsc";
···
241
242
className,
242
243
...props
243
244
}: React.ComponentProps<typeof Image>) {
244
-
const { src, alt, ...rest } = props;
245
+
const { src, alt, width, height, ...rest } = props;
245
246
246
247
if (!src || typeof src !== "string") {
247
248
return (
···
256
257
className={className}
257
258
src={src}
258
259
alt={alt ?? "image"}
259
-
width={0}
260
-
height={0}
260
+
fill
261
261
sizes="100vw"
262
-
style={{ width: "100%", height: "auto" }}
262
+
style={{ objectFit: "contain" }}
263
263
{...rest}
264
264
/>
265
265
</ImageZoom>
···
267
267
</figure>
268
268
);
269
269
}
270
+
271
+
// Get actual image dimensions from filesystem
272
+
const dimensions = getImageDimensions(src);
273
+
const imageWidth = width || dimensions?.width || 1200;
274
+
const imageHeight = height || dimensions?.height || 630;
270
275
271
276
// Generate dark mode image path by adding .dark before extension
272
277
const getDarkImagePath = (path: string) => {
···
304
309
{...rest}
305
310
src={src}
306
311
alt={alt ?? ""}
307
-
width={0}
308
-
height={0}
312
+
width={imageWidth}
313
+
height={imageHeight}
309
314
sizes="100vw"
310
315
style={{ width: "100%", height: "auto" }}
311
316
className={cn("block dark:hidden", className)}
···
321
326
{...rest}
322
327
src={useDarkImage ? darkSrc : src}
323
328
alt={alt ?? ""}
324
-
width={0}
325
-
height={0}
329
+
width={imageWidth}
330
+
height={imageHeight}
326
331
sizes="100vw"
327
332
style={{ width: "100%", height: "auto" }}
328
333
className={cn("hidden dark:block", className)}
···
359
364
},
360
365
};
361
366
367
+
function MDXContent(props: MDXRemoteProps) {
368
+
return (
369
+
<MDXRemote
370
+
{...props}
371
+
components={
372
+
{
373
+
...components,
374
+
...props.components,
375
+
} as MDXRemoteProps["components"]
376
+
}
377
+
/>
378
+
);
379
+
}
380
+
362
381
export function CustomMDX(props: MDXRemoteProps) {
363
382
return (
364
-
<React.Suspense>
383
+
<React.Suspense fallback={<MDXContent {...props} />}>
365
384
<HighlightText>
366
-
<MDXRemote
367
-
{...props}
368
-
components={
369
-
{
370
-
...components,
371
-
...props.components,
372
-
} as MDXRemoteProps["components"]
373
-
}
374
-
/>
385
+
<MDXContent {...props} />
375
386
</HighlightText>
376
387
</React.Suspense>
377
388
);
+1
-1
apps/web/src/content/pages/home.mdx
+1
-1
apps/web/src/content/pages/home.mdx
+75
apps/web/src/lib/image-dimensions.ts
+75
apps/web/src/lib/image-dimensions.ts
···
1
+
import { readFileSync } from "node:fs";
2
+
import { join } from "node:path";
3
+
4
+
interface ImageDimensions {
5
+
width: number;
6
+
height: number;
7
+
}
8
+
9
+
/**
10
+
* Get image dimensions from PNG file
11
+
* PNG spec: width and height are stored at bytes 16-23 as 4-byte integers
12
+
*/
13
+
function getPngDimensions(buffer: Buffer): ImageDimensions {
14
+
const width = buffer.readUInt32BE(16);
15
+
const height = buffer.readUInt32BE(20);
16
+
return { width, height };
17
+
}
18
+
19
+
/**
20
+
* Get image dimensions from JPEG file
21
+
*/
22
+
function getJpegDimensions(buffer: Buffer): ImageDimensions {
23
+
let offset = 2; // Skip SOI marker
24
+
25
+
while (offset < buffer.length) {
26
+
// Check for marker
27
+
if (buffer[offset] !== 0xff) break;
28
+
29
+
const marker = buffer[offset + 1];
30
+
offset += 2;
31
+
32
+
// SOF markers (Start of Frame)
33
+
if (
34
+
marker >= 0xc0 &&
35
+
marker <= 0xcf &&
36
+
marker !== 0xc4 &&
37
+
marker !== 0xc8 &&
38
+
marker !== 0xcc
39
+
) {
40
+
const height = buffer.readUInt16BE(offset + 3);
41
+
const width = buffer.readUInt16BE(offset + 5);
42
+
return { width, height };
43
+
}
44
+
45
+
// Skip to next marker
46
+
const segmentLength = buffer.readUInt16BE(offset);
47
+
offset += segmentLength;
48
+
}
49
+
50
+
throw new Error("Could not find JPEG dimensions");
51
+
}
52
+
53
+
/**
54
+
* Get dimensions for an image in the public directory
55
+
*/
56
+
export function getImageDimensions(publicPath: string): ImageDimensions | null {
57
+
try {
58
+
const fullPath = join(process.cwd(), "public", publicPath);
59
+
const buffer = readFileSync(fullPath);
60
+
61
+
// Check file signature
62
+
if (buffer[0] === 0x89 && buffer.toString("ascii", 1, 4) === "PNG") {
63
+
return getPngDimensions(buffer);
64
+
}
65
+
66
+
if (buffer[0] === 0xff && buffer[1] === 0xd8) {
67
+
return getJpegDimensions(buffer);
68
+
}
69
+
70
+
return null;
71
+
} catch (error) {
72
+
console.warn(`Failed to get dimensions for ${publicPath}:`, error);
73
+
return null;
74
+
}
75
+
}