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Auto merge of #8257 - eefriedman:reorder-webfont-check, r=mbrubeck

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Attempt to fix webfont-related intermittent test failures.

I'm not completely sure the race condition outlined in this patch is
actually the race condition causing failures... but it's a possibility.

(I plan to run this through try a couple of times to see if it actually helps.)

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This commit is contained in:
bors-servo 2015-10-31 03:43:54 +05:30
commit cff9a54569
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