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fix various remote browser signals and bugs

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Signed-off-by: RonniSkansing <rskansing@gmail.com>
This commit is contained in:
RonniSkansing
2026-07-24 13:57:46 +02:00
parent 07771d8f5d
commit 03b37f3aff
4 changed files with 525 additions and 293 deletions
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frontend/src/lib/components/remote-browser/RemoteBrowserStream.svelte
+40 -16
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@@ -149,13 +149,17 @@
};
ws.onmessage = (ev) => {
// Binary messages are raw JPEG screencast frames.
if (typeof ev.data !== 'string') {
renderFrame(ev.data);
return;
}
try {
const msg = JSON.parse(typeof ev.data === 'string' ? ev.data : new TextDecoder().decode(ev.data));
if (msg.type === 'frame') {
const msg = JSON.parse(ev.data);
if (msg.type === 'frame_meta') {
// CSS viewport dimensions used to scale input coordinates.
if (msg.width) remoteWidth = msg.width;
if (msg.height) remoteHeight = msg.height;
renderFrame(msg.data);
frameCount++;
} else if (msg.type === 'url') {
currentURL = msg.value;
if (!urlBarFocused) urlBarValue = msg.value;
@@ -186,18 +190,38 @@
};
}
function renderFrame(base64jpeg) {
if (!canvas) return;
const img = new Image();
img.onload = () => {
const ctx = canvas.getContext('2d');
// Only resize when dimensions change — resizing always clears the canvas
// and flushes the GPU texture even when the value is identical.
if (canvas.width !== img.naturalWidth) canvas.width = img.naturalWidth;
if (canvas.height !== img.naturalHeight) canvas.height = img.naturalHeight;
ctx.drawImage(img, 0, 0);
};
img.src = 'data:image/jpeg;base64,' + base64jpeg;
// Most recent undecoded frame waiting for the decoder, plus a flag so only one
// decode runs at a time. createImageBitmap decodes off the main thread, so
// under load we drop intermediate frames and always draw the newest one.
let pendingFrame = null;
let decoding = false;
function renderFrame(buf) {
pendingFrame = buf;
if (decoding) return;
decoding = true;
(async () => {
while (pendingFrame) {
const bytes = pendingFrame;
pendingFrame = null;
try {
const bmp = await createImageBitmap(new Blob([bytes], { type: 'image/jpeg' }));
if (canvas) {
const ctx = canvas.getContext('2d');
// Only resize when dimensions change — resizing always clears the
// canvas and flushes the GPU texture even when the value is identical.
if (canvas.width !== bmp.width) canvas.width = bmp.width;
if (canvas.height !== bmp.height) canvas.height = bmp.height;
ctx.drawImage(bmp, 0, 0);
}
bmp.close();
frameCount++;
} catch {
// ignore decode errors (partial or corrupt frame)
}
}
decoding = false;
})();
}
function closeStream() {