ladybird/Tests/LibWeb/Crash/JS/draw-from-offscreen-canvas.html
Gingeh 28774efa22
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LibWeb: Don't crash when drawing null image from offscreen canvas
2025-07-20 08:54:53 +02:00

22 lines
744 B
HTML

<!DOCTYPE html>
<canvas id="canvas" width="100" height="50">
<p class="fallback">FAIL (fallback content)</p>
</canvas>
<script id='myWorker' type='text/worker'>
self.onmessage = function(e) {
const canvas = new OffscreenCanvas(100, 50);
const ctx = canvas.getContext('2d');
const bitmap = canvas.transferToImageBitmap();
self.postMessage(bitmap, bitmap);
};
</script>
<script>
const blob = new Blob([document.getElementById('myWorker').textContent]);
const worker = new Worker(URL.createObjectURL(blob));
worker.addEventListener('message', msg => {
const outputCtx = document.getElementById("canvas").getContext('2d');
outputCtx.drawImage(msg.data, 0, 0);
});
worker.postMessage(null);
</script>
</html>