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screencopy: re-allocate buffers on BufferConstraints error

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Doesn't always seem to work immediately. Does compositor need change to
not wait for damage to re-capture after constraint error?
This commit is contained in:
Ian Douglas Scott 2025-09-11 12:14:19 -07:00 • committed by Ian Douglas Scott
parent a4b1e73a8b
commit 7933eef149
1 changed files with 22 additions and 5 deletions
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27
src/backend/wayland/screencopy.rs
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@ -20,6 +20,7 @@ use std::{
use super::{AppData, Buffer, Capture, CaptureImage, Event};
pub struct ScreencopySession {
formats: Option<Formats>,
// swapchain buffers
buffers: Option<[Buffer; 2]>,
session: CaptureSession,
@ -45,6 +46,7 @@ impl ScreencopySession {
.unwrap();
Self {
formats: None,
buffers: None,
session,
release: None,
@ -121,8 +123,9 @@ impl ScreencopyHandler for AppData {
return;
};
session.formats = Some(formats.clone());
// Create new buffer if none, then start capturing
// XXX What if formats have changed?
if session.buffers.is_none() {
session.buffers = Some(array::from_fn(|_| self.create_buffer(formats)));
session.attach_buffer_and_commit(&capture, conn, &self.qh);
@ -209,15 +212,29 @@ impl ScreencopyHandler for AppData {
fn failed(
&mut self,
_conn: &Connection,
conn: &Connection,
_qh: &QueueHandle<Self>,
capture_frame: &CaptureFrame,
reason: WEnum<FailureReason>,
) {
// TODO
log::error!("Screencopy failed: {:?}", reason);
let capture = &capture_frame.data::<FrameData>().unwrap().capture;
if let Some(capture) = capture.upgrade() {
let Some(capture) = capture.upgrade() else {
return;
};
if reason == WEnum::Value(FailureReason::BufferConstraints) {
// Re-allocate buffers, then trigger another capture
log::info!("buffer constraint failure; re-allocating");
let mut session = capture.session.lock().unwrap();
let Some(session) = session.as_mut() else {
return;
};
if let Some(formats) = &session.formats {
session.buffers = Some(array::from_fn(|_| self.create_buffer(&formats)));
}
session.attach_buffer_and_commit(&capture, conn, &self.qh);
} else {
// TODO
log::error!("Screencopy failed: {:?}", reason);
capture.stop();
}
}