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Attempt to fix webfont-related intermittent test failures.

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I'm not completely sure the race condition outlined in this patch is
actually the race condition causing failures... but it seems reasonable.
This commit is contained in:
Eli Friedman 2015-10-29 21:11:06 -07:00
parent 1dfc0481ef
commit 4f866625cc
1 changed files with 15 additions and 7 deletions
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22
components/compositing/constellation.rs
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@ -1203,6 +1203,21 @@ impl<LTF: LayoutTaskFactory, STF: ScriptTaskFactory> Constellation<LTF, STF> {
for frame in self.current_frame_tree_iter(self.root_frame_id) {
let pipeline = self.pipeline(frame.current);
// Check to see if there are any webfonts still loading.
//
// If GetWebFontLoadState returns false, either there are no
// webfonts loading, or there's a WebFontLoaded message waiting in
// script_chan's message queue. Therefore, we need to check this
// before we check whether the document is ready; otherwise,
// there's a race condition where a webfont has finished loading,
// but hasn't yet notified the document.
let (sender, receiver) = ipc::channel().unwrap();
let msg = LayoutControlMsg::GetWebFontLoadState(sender);
pipeline.layout_chan.0.send(msg).unwrap();
if receiver.recv().unwrap() {
return false;
}
// Synchronously query the script task for this pipeline
// to see if it is idle.
let (sender, receiver) = channel();
@ -1213,13 +1228,6 @@ impl<LTF: LayoutTaskFactory, STF: ScriptTaskFactory> Constellation<LTF, STF> {
return false;
}
let (sender, receiver) = ipc::channel().unwrap();
let msg = LayoutControlMsg::GetWebFontLoadState(sender);
pipeline.layout_chan.0.send(msg).unwrap();
if receiver.recv().unwrap() {
return false;
}
// Check the visible rectangle for this pipeline. If the constellation has received a
// size for the pipeline, then its painting should be up to date. If the constellation
// *hasn't* received a size, it could be that the layer was hidden by script before the